<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:01a03465-6554-7ca0-b1a9-d2b282a082ca,g:35d76908-f2fe-4ab9-a5a7-557f4f5bcac2-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:cmc="http://www.cmc.com/20260831" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.cmc.com/20260831">
  <xs:import namespace="http://fasb.org/srt/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/country/2026" schemaLocation="https://xbrl.sec.gov/country/2026/country-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/cyd-af-sub/2026" schemaLocation="https://xbrl.sec.gov/cyd/2026/cyd-af-sub-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2026" schemaLocation="https://xbrl.sec.gov/dei/2026/dei-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2026" schemaLocation="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/stpr/2026" schemaLocation="https://xbrl.sec.gov/stpr/2026/stpr-2026.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="cmc-20260831_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="cmc-20260831_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="cmc-20260831_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="cmc-20260831_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="COVERPAGE" roleURI="http://www.cmc.com/role/COVERPAGE">
        <link:definition>0000001 - Document - COVER PAGE</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AuditInformation" roleURI="http://www.cmc.com/role/AuditInformation">
        <link:definition>0000002 - Document - Audit Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFEARNINGS" roleURI="http://www.cmc.com/role/CONSOLIDATEDSTATEMENTSOFEARNINGS">
        <link:definition>9952151 - Statement - CONSOLIDATED STATEMENTS OF EARNINGS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" roleURI="http://www.cmc.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME">
        <link:definition>9952152 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDBALANCESHEETS" roleURI="http://www.cmc.com/role/CONSOLIDATEDBALANCESHEETS">
        <link:definition>9952153 - Statement - CONSOLIDATED BALANCE SHEETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDBALANCESHEETSParenthetical" roleURI="http://www.cmc.com/role/CONSOLIDATEDBALANCESHEETSParenthetical">
        <link:definition>9952154 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFCASHFLOWS" roleURI="http://www.cmc.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS">
        <link:definition>9952155 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" roleURI="http://www.cmc.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY">
        <link:definition>9952156 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYParenthetical" roleURI="http://www.cmc.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYParenthetical">
        <link:definition>9952157 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES" roleURI="http://www.cmc.com/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES">
        <link:definition>9952158 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACQUISITION" roleURI="http://www.cmc.com/role/ACQUISITION">
        <link:definition>9952159 - Disclosure - ACQUISITION</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACCUMULATEDOTHERCOMPREHENSIVELOSS" roleURI="http://www.cmc.com/role/ACCUMULATEDOTHERCOMPREHENSIVELOSS">
        <link:definition>9952160 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE LOSS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUERECOGNITION" roleURI="http://www.cmc.com/role/REVENUERECOGNITION">
        <link:definition>9952161 - Disclosure - REVENUE RECOGNITION</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INVENTORIES" roleURI="http://www.cmc.com/role/INVENTORIES">
        <link:definition>9952162 - Disclosure - INVENTORIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETS" roleURI="http://www.cmc.com/role/GOODWILLANDOTHERINTANGIBLEASSETS">
        <link:definition>9952163 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASES" roleURI="http://www.cmc.com/role/LEASES">
        <link:definition>9952164 - Disclosure - LEASES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CREDITARRANGEMENTS" roleURI="http://www.cmc.com/role/CREDITARRANGEMENTS">
        <link:definition>9952165 - Disclosure - CREDIT ARRANGEMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DERIVATIVES" roleURI="http://www.cmc.com/role/DERIVATIVES">
        <link:definition>9952166 - Disclosure - DERIVATIVES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUE" roleURI="http://www.cmc.com/role/FAIRVALUE">
        <link:definition>9952167 - Disclosure - FAIR VALUE</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAX" roleURI="http://www.cmc.com/role/INCOMETAX">
        <link:definition>9952168 - Disclosure - INCOME TAX</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONPLANS" roleURI="http://www.cmc.com/role/STOCKBASEDCOMPENSATIONPLANS">
        <link:definition>9952169 - Disclosure - STOCK-BASED COMPENSATION PLANS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEESRETIREMENTPLANS" roleURI="http://www.cmc.com/role/EMPLOYEESRETIREMENTPLANS">
        <link:definition>9952170 - Disclosure - EMPLOYEES' RETIREMENT PLANS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CAPITALSTOCK" roleURI="http://www.cmc.com/role/CAPITALSTOCK">
        <link:definition>9952171 - Disclosure - CAPITAL STOCK</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERSHARE" roleURI="http://www.cmc.com/role/EARNINGSPERSHARE">
        <link:definition>9952172 - Disclosure - EARNINGS PER SHARE</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="COMMITMENTSANDCONTINGENCIES" roleURI="http://www.cmc.com/role/COMMITMENTSANDCONTINGENCIES">
        <link:definition>9952173 - Disclosure - COMMITMENTS AND CONTINGENCIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACCRUEDEXPENSESANDOTHERPAYABLES" roleURI="http://www.cmc.com/role/ACCRUEDEXPENSESANDOTHERPAYABLES">
        <link:definition>9952174 - Disclosure - ACCRUED EXPENSES AND OTHER PAYABLES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTINFORMATION" roleURI="http://www.cmc.com/role/SEGMENTINFORMATION">
        <link:definition>9952175 - Disclosure - SEGMENT INFORMATION</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SCHEDULEIIVALUATIONANDQUALIFYINGACCOUNTSANDRESERVES" roleURI="http://www.cmc.com/role/SCHEDULEIIVALUATIONANDQUALIFYINGACCOUNTSANDRESERVES">
        <link:definition>9952176 - Disclosure - SCHEDULE II &#8212; VALUATION AND QUALIFYING ACCOUNTS AND RESERVES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies" roleURI="http://www.cmc.com/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies">
        <link:definition>9955511 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables" roleURI="http://www.cmc.com/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables">
        <link:definition>9955512 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACQUISITIONTables" roleURI="http://www.cmc.com/role/ACQUISITIONTables">
        <link:definition>9955513 - Disclosure - ACQUISITION (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACCUMULATEDOTHERCOMPREHENSIVELOSSTables" roleURI="http://www.cmc.com/role/ACCUMULATEDOTHERCOMPREHENSIVELOSSTables">
        <link:definition>9955514 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUERECOGNITIONTables" roleURI="http://www.cmc.com/role/REVENUERECOGNITIONTables">
        <link:definition>9955515 - Disclosure - REVENUE RECOGNITION (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INVENTORIESTables" roleURI="http://www.cmc.com/role/INVENTORIESTables">
        <link:definition>9955516 - Disclosure - INVENTORIES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETSTables" roleURI="http://www.cmc.com/role/GOODWILLANDOTHERINTANGIBLEASSETSTables">
        <link:definition>9955517 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESTables" roleURI="http://www.cmc.com/role/LEASESTables">
        <link:definition>9955518 - Disclosure - LEASES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CREDITARRANGEMENTSTables" roleURI="http://www.cmc.com/role/CREDITARRANGEMENTSTables">
        <link:definition>9955519 - Disclosure - CREDIT ARRANGEMENTS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DERIVATIVESTables" roleURI="http://www.cmc.com/role/DERIVATIVESTables">
        <link:definition>9955520 - Disclosure - DERIVATIVES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUETables" roleURI="http://www.cmc.com/role/FAIRVALUETables">
        <link:definition>9955521 - Disclosure - FAIR VALUE (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXTables" roleURI="http://www.cmc.com/role/INCOMETAXTables">
        <link:definition>9955522 - Disclosure - INCOME TAX (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONPLANSTables" roleURI="http://www.cmc.com/role/STOCKBASEDCOMPENSATIONPLANSTables">
        <link:definition>9955523 - Disclosure - STOCK-BASED COMPENSATION PLANS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEESRETIREMENTPLANSEMPLOYEESRETIREMENTPLANSTables" roleURI="http://www.cmc.com/role/EMPLOYEESRETIREMENTPLANSEMPLOYEESRETIREMENTPLANSTables">
        <link:definition>9955524 - Disclosure - EMPLOYEES' RETIREMENT PLANS EMPLOYEES' RETIREMENT PLANS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERSHARETables" roleURI="http://www.cmc.com/role/EARNINGSPERSHARETables">
        <link:definition>9955525 - Disclosure - EARNINGS PER SHARE (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACCRUEDEXPENSESANDOTHERPAYABLESTables" roleURI="http://www.cmc.com/role/ACCRUEDEXPENSESANDOTHERPAYABLESTables">
        <link:definition>9955526 - Disclosure - ACCRUED EXPENSES AND OTHER PAYABLES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTINFORMATIONTables" roleURI="http://www.cmc.com/role/SEGMENTINFORMATIONTables">
        <link:definition>9955527 - Disclosure - SEGMENT INFORMATION (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails" roleURI="http://www.cmc.com/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails">
        <link:definition>9955528 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESEstimatedUsefulLivesofPropertyPlantandEquipmentDetails" roleURI="http://www.cmc.com/role/NATUREOFOPERATIONSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESEstimatedUsefulLivesofPropertyPlantandEquipmentDetails">
        <link:definition>9955529 - Disclosure - NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Estimated Useful Lives of Property, Plant and Equipment) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACQUISITIONAdditionalInformationDetails" roleURI="http://www.cmc.com/role/ACQUISITIONAdditionalInformationDetails">
        <link:definition>9955530 - Disclosure - ACQUISITION -Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACQUISITIONScheduleofBusinessAcquisitionsbyAcquisitionDetails" roleURI="http://www.cmc.com/role/ACQUISITIONScheduleofBusinessAcquisitionsbyAcquisitionDetails">
        <link:definition>9955531 - Disclosure - ACQUISITION - Schedule of Business Acquisitions, by Acquisition (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACQUISITIONFiniteLivedandIndefiniteLivedIntangibleAssetsAcquiredasPartofBusinessCombinationDetails" roleURI="http://www.cmc.com/role/ACQUISITIONFiniteLivedandIndefiniteLivedIntangibleAssetsAcquiredasPartofBusinessCombinationDetails">
        <link:definition>9955532 - Disclosure - ACQUISITION - Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACQUISITIONScheduleofFinancialResultsDetails" roleURI="http://www.cmc.com/role/ACQUISITIONScheduleofFinancialResultsDetails">
        <link:definition>9955533 - Disclosure - ACQUISITION - Schedule of Financial Results (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACQUISITIONProFormaInformationDetails" roleURI="http://www.cmc.com/role/ACQUISITIONProFormaInformationDetails">
        <link:definition>9955534 - Disclosure - ACQUISITION - Pro Forma Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACCUMULATEDOTHERCOMPREHENSIVELOSSAOCIbyComponentsDetails" roleURI="http://www.cmc.com/role/ACCUMULATEDOTHERCOMPREHENSIVELOSSAOCIbyComponentsDetails">
        <link:definition>9955535 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE LOSS - (AOCI by Components) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUERECOGNITIONRevenueRecognitionMethodDetails" roleURI="http://www.cmc.com/role/REVENUERECOGNITIONRevenueRecognitionMethodDetails">
        <link:definition>9955536 - Disclosure - REVENUE RECOGNITION - Revenue Recognition Method (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUERECOGNITIONContractAssetsandLiabilitiesDetails" roleURI="http://www.cmc.com/role/REVENUERECOGNITIONContractAssetsandLiabilitiesDetails">
        <link:definition>9955537 - Disclosure - REVENUE RECOGNITION - Contract Assets and Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUERECOGNITIONRemainingPerformanceObligationsDetails" roleURI="http://www.cmc.com/role/REVENUERECOGNITIONRemainingPerformanceObligationsDetails">
        <link:definition>9955538 - Disclosure - REVENUE RECOGNITION - Remaining Performance Obligations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUERECOGNITIONRemainingPerformanceObligationsDetails_1" roleURI="http://www.cmc.com/role/REVENUERECOGNITIONRemainingPerformanceObligationsDetails_1">
        <link:definition>9955538 - Disclosure - REVENUE RECOGNITION - Remaining Performance Obligations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INVENTORIESNarrativeDetails" roleURI="http://www.cmc.com/role/INVENTORIESNarrativeDetails">
        <link:definition>9955539 - Disclosure - INVENTORIES (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETSChangesintheCarryingAmountofGoodwillDetails" roleURI="http://www.cmc.com/role/GOODWILLANDOTHERINTANGIBLEASSETSChangesintheCarryingAmountofGoodwillDetails">
        <link:definition>9955540 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Changes in the Carrying Amount of Goodwill) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETSNarrativeDetails" roleURI="http://www.cmc.com/role/GOODWILLANDOTHERINTANGIBLEASSETSNarrativeDetails">
        <link:definition>9955541 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETSNarrativeDetails_1" roleURI="http://www.cmc.com/role/GOODWILLANDOTHERINTANGIBLEASSETSNarrativeDetails_1">
        <link:definition>9955541 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETSScheduleofIndefiniteLivedIntangibleAssetsDetails" roleURI="http://www.cmc.com/role/GOODWILLANDOTHERINTANGIBLEASSETSScheduleofIndefiniteLivedIntangibleAssetsDetails">
        <link:definition>9955542 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Indefinite Lived Intangible Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails" roleURI="http://www.cmc.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails">
        <link:definition>9955543 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Intangible Assets) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETSEstimatedFutureAmortizationExpenseDetails" roleURI="http://www.cmc.com/role/GOODWILLANDOTHERINTANGIBLEASSETSEstimatedFutureAmortizationExpenseDetails">
        <link:definition>9955544 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Estimated Future Amortization Expense) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesBalanceSheetComponentsDetails" roleURI="http://www.cmc.com/role/LeasesBalanceSheetComponentsDetails">
        <link:definition>9955545 - Disclosure - Leases, Balance Sheet Components (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesLeaseCostDetails" roleURI="http://www.cmc.com/role/LeasesLeaseCostDetails">
        <link:definition>9955546 - Disclosure - Leases, Lease Cost (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesWeightedaverageLeaseTermsandDiscountRatesDetails" roleURI="http://www.cmc.com/role/LeasesWeightedaverageLeaseTermsandDiscountRatesDetails">
        <link:definition>9955547 - Disclosure - Leases, Weighted-average Lease Terms and Discount Rates (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesCashFlowandOtherInformationRelatedtoLeasesDetails" roleURI="http://www.cmc.com/role/LeasesCashFlowandOtherInformationRelatedtoLeasesDetails">
        <link:definition>9955548 - Disclosure - Leases, Cash Flow and Other Information Related to Leases (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesMaturityofLeaseLiabilitiesDetails" roleURI="http://www.cmc.com/role/LeasesMaturityofLeaseLiabilitiesDetails">
        <link:definition>9955549 - Disclosure - Leases, Maturity of Lease Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesMaturityofLeaseLiabilitiesDetails_1" roleURI="http://www.cmc.com/role/LeasesMaturityofLeaseLiabilitiesDetails_1">
        <link:definition>9955549 - Disclosure - Leases, Maturity of Lease Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESNarrativeDetails" roleURI="http://www.cmc.com/role/LEASESNarrativeDetails">
        <link:definition>9955550 - Disclosure - LEASES - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CREDITARRANGEMENTSLongtermDebtDetails" roleURI="http://www.cmc.com/role/CREDITARRANGEMENTSLongtermDebtDetails">
        <link:definition>9955551 - Disclosure - CREDIT ARRANGEMENTS (Long-term Debt) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CREDITARRANGEMENTSLongtermDebtDetails_1" roleURI="http://www.cmc.com/role/CREDITARRANGEMENTSLongtermDebtDetails_1">
        <link:definition>9955551 - Disclosure - CREDIT ARRANGEMENTS (Long-term Debt) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CREDITARRANGEMENTSNarrativeDetails" roleURI="http://www.cmc.com/role/CREDITARRANGEMENTSNarrativeDetails">
        <link:definition>9955552 - Disclosure - CREDIT ARRANGEMENTS (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CREDITARRANGEMENTSScheduledMaturitiesofLongtermDebtDetails" roleURI="http://www.cmc.com/role/CREDITARRANGEMENTSScheduledMaturitiesofLongtermDebtDetails">
        <link:definition>9955553 - Disclosure - CREDIT ARRANGEMENTS (Scheduled Maturities of Long-term Debt) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DERIVATIVESNarrativeDetails" roleURI="http://www.cmc.com/role/DERIVATIVESNarrativeDetails">
        <link:definition>9955554 - Disclosure - DERIVATIVES (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DERIVATIVESCommodityContractCommitmentsDetails" roleURI="http://www.cmc.com/role/DERIVATIVESCommodityContractCommitmentsDetails">
        <link:definition>9955555 - Disclosure - DERIVATIVES - Commodity Contract Commitments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DERIVATIVESDerivativesNotDesignatedasHedgingInstrumentsDetails" roleURI="http://www.cmc.com/role/DERIVATIVESDerivativesNotDesignatedasHedgingInstrumentsDetails">
        <link:definition>9955556 - Disclosure - DERIVATIVES (Derivatives Not Designated as Hedging Instruments) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DERIVATIVESDerivativesNotDesignatedasHedgingInstrumentsDetails_1" roleURI="http://www.cmc.com/role/DERIVATIVESDerivativesNotDesignatedasHedgingInstrumentsDetails_1">
        <link:definition>9955556 - Disclosure - DERIVATIVES (Derivatives Not Designated as Hedging Instruments) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DERIVATIVESScheduleofDerivativeAssetsandLiabilitiesDetails" roleURI="http://www.cmc.com/role/DERIVATIVESScheduleofDerivativeAssetsandLiabilitiesDetails">
        <link:definition>9955557 - Disclosure - DERIVATIVES (Schedule of Derivative Assets and Liabilities) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DERIVATIVESScheduleofDerivativeAssetsandLiabilitiesDetails_1" roleURI="http://www.cmc.com/role/DERIVATIVESScheduleofDerivativeAssetsandLiabilitiesDetails_1">
        <link:definition>9955557 - Disclosure - DERIVATIVES (Schedule of Derivative Assets and Liabilities) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUEFinancialAssetsandFinancialLiabilitiesMeasuredatFairValueonRecurringBasisDetails" roleURI="http://www.cmc.com/role/FAIRVALUEFinancialAssetsandFinancialLiabilitiesMeasuredatFairValueonRecurringBasisDetails">
        <link:definition>9955558 - Disclosure - FAIR VALUE (Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUEReconciliationofCommodityDerivativeRecognizedinOtherComprehensiveIncomeDetails" roleURI="http://www.cmc.com/role/FAIRVALUEReconciliationofCommodityDerivativeRecognizedinOtherComprehensiveIncomeDetails">
        <link:definition>9955559 - Disclosure - FAIR VALUE (Reconciliation of Commodity Derivative Recognized in Other Comprehensive Income) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUENarrativeDetails" roleURI="http://www.cmc.com/role/FAIRVALUENarrativeDetails">
        <link:definition>9955560 - Disclosure - FAIR VALUE (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXComponentsofEarningsfromContinuingOperationsbeforeIncomeTaxesDetails" roleURI="http://www.cmc.com/role/INCOMETAXComponentsofEarningsfromContinuingOperationsbeforeIncomeTaxesDetails">
        <link:definition>9955561 - Disclosure - INCOME TAX (Components of Earnings from Continuing Operations before Income Taxes) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXIncomeTaxesIncludedintheConsolidatedStatementsofOperationsDetails" roleURI="http://www.cmc.com/role/INCOMETAXIncomeTaxesIncludedintheConsolidatedStatementsofOperationsDetails">
        <link:definition>9955562 - Disclosure - INCOME TAX (Income Taxes Included in the Consolidated Statements of Operations) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXReconciliationofFederalStatutoryRatetoEffectiveTaxRatefromContinuingOperationsCurrentYearDetails" roleURI="http://www.cmc.com/role/INCOMETAXReconciliationofFederalStatutoryRatetoEffectiveTaxRatefromContinuingOperationsCurrentYearDetails">
        <link:definition>9955563 - Disclosure - INCOME TAX (Reconciliation of Federal Statutory Rate to Effective Tax Rate from Continuing Operations, Current Year) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXReconciliationofFederalStatutoryRatetoEffectiveTaxRatefromContinuingOperationsPriorYearsDetails" roleURI="http://www.cmc.com/role/INCOMETAXReconciliationofFederalStatutoryRatetoEffectiveTaxRatefromContinuingOperationsPriorYearsDetails">
        <link:definition>9955564 - Disclosure - INCOME TAX (Reconciliation of Federal Statutory Rate to Effective Tax Rate from Continuing Operations, Prior Years) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXDeferredTaxAssetsandLiabilitiesDetails" roleURI="http://www.cmc.com/role/INCOMETAXDeferredTaxAssetsandLiabilitiesDetails">
        <link:definition>9955565 - Disclosure - INCOME TAX (Deferred Tax Assets and Liabilities) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXNarrativeDetails" roleURI="http://www.cmc.com/role/INCOMETAXNarrativeDetails">
        <link:definition>9955566 - Disclosure - INCOME TAX (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXUnrecognizedTaxBenefitsDetails" roleURI="http://www.cmc.com/role/INCOMETAXUnrecognizedTaxBenefitsDetails">
        <link:definition>9955567 - Disclosure - INCOME TAX (Unrecognized Tax Benefits) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXScheduleofCashTaxesPaidDetails" roleURI="http://www.cmc.com/role/INCOMETAXScheduleofCashTaxesPaidDetails">
        <link:definition>9955568 - Disclosure - INCOME TAX - Schedule of Cash Taxes Paid (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONPLANSStockBasedAwardsGrantedDetails" roleURI="http://www.cmc.com/role/STOCKBASEDCOMPENSATIONPLANSStockBasedAwardsGrantedDetails">
        <link:definition>9955569 - Disclosure - STOCK-BASED COMPENSATION PLANS (Stock-Based Awards Granted) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONPLANSNarrativeDetails" roleURI="http://www.cmc.com/role/STOCKBASEDCOMPENSATIONPLANSNarrativeDetails">
        <link:definition>9955570 - Disclosure - STOCK-BASED COMPENSATION PLANS (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONPLANSRestrictedStockAwardsandPerformanceStockUnitsExcludingtheCashComponentDetails" roleURI="http://www.cmc.com/role/STOCKBASEDCOMPENSATIONPLANSRestrictedStockAwardsandPerformanceStockUnitsExcludingtheCashComponentDetails">
        <link:definition>9955571 - Disclosure - STOCK-BASED COMPENSATION PLANS (Restricted Stock Awards and Performance Stock Units Excluding the Cash Component) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONPLANSYearlyActivityofStockPurchasePlanDetails" roleURI="http://www.cmc.com/role/STOCKBASEDCOMPENSATIONPLANSYearlyActivityofStockPurchasePlanDetails">
        <link:definition>9955572 - Disclosure - STOCK-BASED COMPENSATION PLANS (Yearly Activity of Stock Purchase Plan) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEESRETIREMENTPLANSNarrativeDetails" roleURI="http://www.cmc.com/role/EMPLOYEESRETIREMENTPLANSNarrativeDetails">
        <link:definition>9955573 - Disclosure - EMPLOYEES' RETIREMENT PLANS (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEESRETIREMENTPLANSNarrativeDetails_1" roleURI="http://www.cmc.com/role/EMPLOYEESRETIREMENTPLANSNarrativeDetails_1">
        <link:definition>9955573 - Disclosure - EMPLOYEES' RETIREMENT PLANS (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEESRETIREMENTPLANSNarrativeDetails_2" roleURI="http://www.cmc.com/role/EMPLOYEESRETIREMENTPLANSNarrativeDetails_2">
        <link:definition>9955573 - Disclosure - EMPLOYEES' RETIREMENT PLANS (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEESRETIREMENTPLANSNarrativeDetails_3" roleURI="http://www.cmc.com/role/EMPLOYEESRETIREMENTPLANSNarrativeDetails_3">
        <link:definition>9955573 - Disclosure - EMPLOYEES' RETIREMENT PLANS (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEESRETIREMENTPLANSBenefitObligationandFairValueofPlanAssetsDetails" roleURI="http://www.cmc.com/role/EMPLOYEESRETIREMENTPLANSBenefitObligationandFairValueofPlanAssetsDetails">
        <link:definition>9955574 - Disclosure - EMPLOYEES' RETIREMENT PLANS (Benefit Obligation and Fair Value of Plan Assets) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEESRETIREMENTPLANSNetPeriodicBenefitCostDetails" roleURI="http://www.cmc.com/role/EMPLOYEESRETIREMENTPLANSNetPeriodicBenefitCostDetails">
        <link:definition>9955575 - Disclosure - EMPLOYEES' RETIREMENT PLANS (Net Periodic Benefit Cost) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEESRETIREMENTPLANSWeightedaverageAssumptionsDetails" roleURI="http://www.cmc.com/role/EMPLOYEESRETIREMENTPLANSWeightedaverageAssumptionsDetails">
        <link:definition>9955576 - Disclosure - EMPLOYEES' RETIREMENT PLANS (Weighted-average Assumptions) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEESRETIREMENTPLANSWeightedaverageAssetAllocationsDetails" roleURI="http://www.cmc.com/role/EMPLOYEESRETIREMENTPLANSWeightedaverageAssetAllocationsDetails">
        <link:definition>9955577 - Disclosure - EMPLOYEES' RETIREMENT PLANS (Weighted-average Asset Allocations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEESRETIREMENTPLANSFairValueofPlanAssetsDetails" roleURI="http://www.cmc.com/role/EMPLOYEESRETIREMENTPLANSFairValueofPlanAssetsDetails">
        <link:definition>9955578 - Disclosure - EMPLOYEES' RETIREMENT PLANS (Fair Value of Plan Assets) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEESRETIREMENTPLANSFuturePensionBenefitPaymentsDetails" roleURI="http://www.cmc.com/role/EMPLOYEESRETIREMENTPLANSFuturePensionBenefitPaymentsDetails">
        <link:definition>9955579 - Disclosure - EMPLOYEES' RETIREMENT PLANS (Future Pension Benefit Payments) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CAPITALSTOCKNarrativeDetails" roleURI="http://www.cmc.com/role/CAPITALSTOCKNarrativeDetails">
        <link:definition>9955580 - Disclosure - CAPITAL STOCK (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERSHARECalculationsofBasicandDilutedEarningsPerShareDetails" roleURI="http://www.cmc.com/role/EARNINGSPERSHARECalculationsofBasicandDilutedEarningsPerShareDetails">
        <link:definition>9955581 - Disclosure - EARNINGS PER SHARE (Calculations of Basic and Diluted Earnings Per Share) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="COMMITMENTSANDCONTINGENCIESNarrativeDetails" roleURI="http://www.cmc.com/role/COMMITMENTSANDCONTINGENCIESNarrativeDetails">
        <link:definition>9955582 - Disclosure - COMMITMENTS AND CONTINGENCIES (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACCRUEDEXPENSESANDOTHERPAYABLESDetails" roleURI="http://www.cmc.com/role/ACCRUEDEXPENSESANDOTHERPAYABLESDetails">
        <link:definition>9955583 - Disclosure - ACCRUED EXPENSES AND OTHER PAYABLES (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTINFORMATIONNarrativeDetails" roleURI="http://www.cmc.com/role/SEGMENTINFORMATIONNarrativeDetails">
        <link:definition>9955584 - Disclosure - SEGMENT INFORMATION (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTINFORMATIONSummaryofCertainFinancialInformationfromContinuingOperationsbyReportableSegmentDetails" roleURI="http://www.cmc.com/role/SEGMENTINFORMATIONSummaryofCertainFinancialInformationfromContinuingOperationsbyReportableSegmentDetails">
        <link:definition>9955585 - Disclosure - SEGMENT INFORMATION (Summary of Certain Financial Information from Continuing Operations by Reportable Segment) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTINFORMATIONReconciliationsofEarningsfromContinuingOperationstoAdjustedOperatingProfitDetails" roleURI="http://www.cmc.com/role/SEGMENTINFORMATIONReconciliationsofEarningsfromContinuingOperationstoAdjustedOperatingProfitDetails">
        <link:definition>9955586 - Disclosure - SEGMENT INFORMATION (Reconciliations of Earnings from Continuing Operations to Adjusted Operating Profit) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTINFORMATIONExternalNetSalesfromContinuingOperationsbyMajorProductDetails" roleURI="http://www.cmc.com/role/SEGMENTINFORMATIONExternalNetSalesfromContinuingOperationsbyMajorProductDetails">
        <link:definition>9955587 - Disclosure - SEGMENT INFORMATION (External Net Sales from Continuing Operations by Major Product) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTINFORMATIONExternalNetSalesfromContinuingOperationsbyGeographicAreaDetails" roleURI="http://www.cmc.com/role/SEGMENTINFORMATIONExternalNetSalesfromContinuingOperationsbyGeographicAreaDetails">
        <link:definition>9955588 - Disclosure - SEGMENT INFORMATION (External Net Sales from Continuing Operations by Geographic Area) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTINFORMATIONLongLivedAssetsbyGeographicAreaDetails" roleURI="http://www.cmc.com/role/SEGMENTINFORMATIONLongLivedAssetsbyGeographicAreaDetails">
        <link:definition>9955589 - Disclosure - SEGMENT INFORMATION (Long-Lived Assets by Geographic Area) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SCHEDULEIIVALUATIONANDQUALIFYINGACCOUNTSANDRESERVESDetails" roleURI="http://www.cmc.com/role/SCHEDULEIIVALUATIONANDQUALIFYINGACCOUNTSANDRESERVESDetails">
        <link:definition>9955590 - Disclosure - SCHEDULE II &#8212; VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="cmc_AuditInformationAbstract" abstract="true" name="AuditInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="cmc_WriteOffOfCommittedFinancingFees" abstract="false" name="WriteOffOfCommittedFinancingFees" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_SettlementOfNewMarketsTaxCreditTransaction" abstract="false" name="SettlementOfNewMarketsTaxCreditTransaction" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_ProceedsFromGovernmentGrantsRelatedToPropertyPlantAndEquipment" abstract="false" name="ProceedsFromGovernmentGrantsRelatedToPropertyPlantAndEquipment" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_PaymentForCommittedFinancingFees" abstract="false" name="PaymentForCommittedFinancingFees" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_RepaymentsUnderAccountsReceivableProgramsFinancingActivities" abstract="false" name="RepaymentsUnderAccountsReceivableProgramsFinancingActivities" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_NoncontrollingInterestIncreaseFromContribution" abstract="false" name="NoncontrollingInterestIncreaseFromContribution" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_GovernmentGrantsPolicyTextBlock" abstract="false" name="GovernmentGrantsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="cmc_ScheduleOfBalanceSheetComponentsOfLeasesTableTextBlock" abstract="false" name="ScheduleOfBalanceSheetComponentsOfLeasesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="cmc_CashFlowAndOtherInformationRelatedToLeasesTableTextBlock" abstract="false" name="CashFlowAndOtherInformationRelatedToLeasesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="cmc_ComponentofincometaxbenefitTableTextBlock" abstract="false" name="ComponentofincometaxbenefitTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="cmc_StockBasedAwardsGrantedTableTextBlock" abstract="false" name="StockBasedAwardsGrantedTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="cmc_SecuredAccountsReceivableMember" abstract="false" name="SecuredAccountsReceivableMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_PolandCompensationSchemeActMember" abstract="true" name="PolandCompensationSchemeActMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_EnergyAidProgram2022Member" abstract="true" name="EnergyAidProgram2022Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_WestVirginiaEconomicDevelopmentAuthorityMember" abstract="true" name="WestVirginiaEconomicDevelopmentAuthorityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_NumberOfElectricArcFurnaceMiniMills" abstract="false" name="NumberOfElectricArcFurnaceMiniMills" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="cmc_NumberOfElectricArcFurnaceMicroMills" abstract="false" name="NumberOfElectricArcFurnaceMicroMills" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="cmc_NumberOfRerollingMills" abstract="false" name="NumberOfRerollingMills" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="cmc_PercentageOfSecuredAccountsReceivable" abstract="false" name="PercentageOfSecuredAccountsReceivable" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cmc_ProceedsFromGovernmentGrantsRelatedToIncome" abstract="false" name="ProceedsFromGovernmentGrantsRelatedToIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_AgreementForPerformanceBasedPrincipalReductionLoan" abstract="false" name="AgreementForPerformanceBasedPrincipalReductionLoan" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_ProceedsFromPerformanceBasedPrincipalReductionLoan" abstract="false" name="ProceedsFromPerformanceBasedPrincipalReductionLoan" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_FoleyProductsCompanyLLCMember" abstract="true" name="FoleyProductsCompanyLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_ConcretePipeAndPrecastLLCMember" abstract="true" name="ConcretePipeAndPrecastLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_RealPropertyMember" abstract="true" name="RealPropertyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_PersonalPropertyMember" abstract="true" name="PersonalPropertyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_NumberOfStatesInOperation" abstract="false" name="NumberOfStatesInOperation" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="cmc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentInterestExpense" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentInterestExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_BusinessCombinationAcquisitionRelatedCostAdjustment" abstract="false" name="BusinessCombinationAcquisitionRelatedCostAdjustment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAmortizationExpense" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAmortizationExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCostOfGoodsSold" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCostOfGoodsSold" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDepreciation" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDepreciation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLeaseExpense" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLeaseExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccountsReceivable" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccountsReceivable" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherAssetCurrent" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherAssetCurrent" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherAssetNoncurrent" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherAssetNoncurrent" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccountsPayableAccruedExpensesAndOtherPayables" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccountsPayableAccruedExpensesAndOtherPayables" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredIncomeTaxes" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredIncomeTaxes" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherLiabilityNoncurrent" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherLiabilityNoncurrent" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_CustomerBacklogMember" abstract="true" name="CustomerBacklogMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_NorthAmericaSegmentMember" abstract="true" name="NorthAmericaSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_FabricatedProductandInstallationServicesMember" abstract="true" name="FabricatedProductandInstallationServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_FabricatedProductwithoutInstallationServicesMember" abstract="true" name="FabricatedProductwithoutInstallationServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_ContractwithCustomerContractasPercentofTotalRevenue" abstract="false" name="ContractwithCustomerContractasPercentofTotalRevenue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cmc_NorthAmericaSteelGroupMember" abstract="true" name="NorthAmericaSteelGroupMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_ConstructionSolutionsGroupMember" abstract="true" name="ConstructionSolutionsGroupMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_EuropeSteelGroupMember" abstract="true" name="EuropeSteelGroupMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_GoodwillGrossAbstract" abstract="true" name="GoodwillGrossAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="cmc_GoodwillGrossForeignCurrencyTranslationGainLoss" abstract="false" name="GoodwillGrossForeignCurrencyTranslationGainLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_GoodwillImpairedForeignCurrencyTranslationGainLoss" abstract="false" name="GoodwillImpairedForeignCurrencyTranslationGainLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_GoodwillNetAbstract" abstract="true" name="GoodwillNetAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="cmc_NineQualitativeReportingUnitsMember" abstract="true" name="NineQualitativeReportingUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_FirstQuantitativeReportingUnitMember" abstract="true" name="FirstQuantitativeReportingUnitMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_IndefiniteLivedIntangibleAssetsImpairmentTesting" abstract="false" name="IndefiniteLivedIntangibleAssetsImpairmentTesting" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_IndefiniteLivedIntangibleAssetsNumberOfReportingUnitsQualitativeTested" abstract="false" name="IndefiniteLivedIntangibleAssetsNumberOfReportingUnitsQualitativeTested" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="cmc_IndefiniteLivedIntangibleAssetsNumberOfReportingUnitsQuantitativeTested" abstract="false" name="IndefiniteLivedIntangibleAssetsNumberOfReportingUnitsQuantitativeTested" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="cmc_TensarMember" abstract="true" name="TensarMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_LeasedAssetsAbstract" abstract="true" name="LeasedAssetsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="cmc_RightOfUseAsset" abstract="false" name="RightOfUseAsset" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_LeaseLiability" abstract="false" name="LeaseLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_FinanceLeaseCost" abstract="false" name="FinanceLeaseCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_VariableAndShortTermLeaseCost" abstract="false" name="VariableAndShortTermLeaseCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_CashFlowLeasesAbstract" abstract="true" name="CashFlowLeasesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="cmc_RightOfUseAssetsObtainedInExchangeForLeaseObligationsAbstract" abstract="true" name="RightOfUseAssetsObtainedInExchangeForLeaseObligationsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="cmc_PrecastPlatformMember" abstract="true" name="PrecastPlatformMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_OperatingLeaseRightOfUseAssetIncreaseDuringPeriod" abstract="false" name="OperatingLeaseRightOfUseAssetIncreaseDuringPeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_FinanceLeaseRightOfUseAssetIncreaseDuringPeriod" abstract="false" name="FinanceLeaseRightOfUseAssetIncreaseDuringPeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_A300MillionNotesAt4.125DueJanuary2030Member" abstract="true" name="A300MillionNotesAt4.125DueJanuary2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_A300MillionNotesAt3.875DueFebruary2031Member" abstract="true" name="A300MillionNotesAt3.875DueFebruary2031Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_A300MillionNotesAt4.375DueMarch2032Member" abstract="true" name="A300MillionNotesAt4.375DueMarch2032Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_FivePointSevenFixeZeroPercentNotesDueTwentyThirtyThreeMember" abstract="true" name="FivePointSevenFixeZeroPercentNotesDueTwentyThirtyThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_SixPointZeroZeroPercentNotesDueTwentyThirtyFiveMember" abstract="true" name="SixPointZeroZeroPercentNotesDueTwentyThirtyFiveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_Series2022BondsDue2047Member" abstract="true" name="Series2022BondsDue2047Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_Series2025BondsDue2032Member" abstract="true" name="Series2025BondsDue2032Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_A4.570ShortTermBorrowingsMember" abstract="true" name="A4.570ShortTermBorrowingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_OtherDebtMember" abstract="true" name="OtherDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_LongTermDebtAndFinanceLeaseObligationsNet" abstract="false" name="LongTermDebtAndFinanceLeaseObligationsNet" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_A2033And2035SeniorUnsecuredNotesMember" abstract="true" name="A2033And2035SeniorUnsecuredNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_PolandProgramMember" abstract="true" name="PolandProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_CmcpMember" abstract="true" name="CmcpMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_DebtInstrumentCovenantAxis" abstract="true" name="DebtInstrumentCovenantAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="cmc_DebtInstrumentCovenantDomain" abstract="true" name="DebtInstrumentCovenantDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_MaximumBorrowingCapacityWithBankApprovalMember" abstract="true" name="MaximumBorrowingCapacityWithBankApprovalMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_BondsEffectiveYieldInterestRate" abstract="false" name="BondsEffectiveYieldInterestRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="cmc_MinimumInterestCoverageRatio" abstract="false" name="MinimumInterestCoverageRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="cmc_MaximumDebttoCapitalizationRatio" abstract="false" name="MaximumDebttoCapitalizationRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="cmc_InterestCoverageRatio" abstract="false" name="InterestCoverageRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="cmc_DebttoCapitalizationRatio" abstract="false" name="DebttoCapitalizationRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="cmc_TransferofAccountsReceivableProgramFaceAmount" abstract="false" name="TransferofAccountsReceivableProgramFaceAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_LongTermDebtNetOfFinanceLeases" abstract="false" name="LongTermDebtNetOfFinanceLeases" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_CopperMember" abstract="true" name="CopperMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_EnergyFloatingRate" abstract="false" name="EnergyFloatingRate" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_LongTermDebtExcludingOtherBorrowingsAndFinanceLeases" abstract="false" name="LongTermDebtExcludingOtherBorrowingsAndFinanceLeases" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseGainAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationNondeductibleExpenseGainAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_EffectiveIncomeTaxRateReconciliationInvestmentCreditBasisAdjustmentAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationInvestmentCreditBasisAdjustmentAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_EffectiveIncomeTaxRateReconciliationWithholdingTaxAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationWithholdingTaxAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseGainPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationNondeductibleExpenseGainPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cmc_EffectiveIncomeTaxRateReconciliationInvestmentCreditBasisAdjustmentPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationInvestmentCreditBasisAdjustmentPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cmc_EffectiveIncomeTaxRateReconciliationWithholdingTaxPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationWithholdingTaxPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cmc_EffectiveIncomeTaxRateReconciliationInterestExpenseRelatedToUncertainTaxPositions" abstract="false" name="EffectiveIncomeTaxRateReconciliationInterestExpenseRelatedToUncertainTaxPositions" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_EffectiveIncomeTaxRateReconciliationTollChargeAndRelatedForeignTaxCredits" abstract="false" name="EffectiveIncomeTaxRateReconciliationTollChargeAndRelatedForeignTaxCredits" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_DeferredTaxAssetsRightOfUseOperatingLeaseLiabilities" abstract="false" name="DeferredTaxAssetsRightOfUseOperatingLeaseLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_DeferredTaxLiabilitiesIntangibleAssets1" abstract="false" name="DeferredTaxLiabilitiesIntangibleAssets1" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_QualifyingAdvancedEnergyProjectTaxCreditIncomeTaxBenefit" abstract="false" name="QualifyingAdvancedEnergyProjectTaxCreditIncomeTaxBenefit" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_OtherStatesMember" abstract="true" name="OtherStatesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_PerformanceConditionAxis" abstract="true" name="PerformanceConditionAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="cmc_PerformanceConditionDomain" abstract="true" name="PerformanceConditionDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_EBITDAMember" abstract="true" name="EBITDAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_RelativeTotalShareholderReturnMember" abstract="true" name="RelativeTotalShareholderReturnMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_SharebasedCompensationArrangementBySharebasedPaymentAwardVestingFrequency" abstract="false" name="SharebasedCompensationArrangementBySharebasedPaymentAwardVestingFrequency" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="cmc_PercentagePerformanceTargetWeighted" abstract="false" name="PercentagePerformanceTargetWeighted" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cmc_Payoutpercentage" abstract="false" name="Payoutpercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cmc_ShareBasedCompensationArrangementByShareBasedPaymentAwardMetricPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMetricPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="cmc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquivalentSharesExpectedToVest" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquivalentSharesExpectedToVest" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="cmc_RestrictedStockAwardsAndPsusexcludingthecashcomponentMember" abstract="true" name="RestrictedStockAwardsAndPsusexcludingthecashcomponentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_UKPensionPlanMember" abstract="true" name="UKPensionPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_DefinedBenefitPlanEffectiveInterestRateonBenefitObligations" abstract="false" name="DefinedBenefitPlanEffectiveInterestRateonBenefitObligations" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cmc_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermRateOfReturn" abstract="false" name="DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermRateOfReturn" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="cmc_DefinedBenefitPlanPlanAssetsNet" abstract="false" name="DefinedBenefitPlanPlanAssetsNet" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_CerclaSitesMember" abstract="true" name="CerclaSitesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_SegmentEliminationsMember" abstract="true" name="SegmentEliminationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_AdjustedOperatingProfitLossFromContinuingOperation" abstract="false" name="AdjustedOperatingProfitLossFromContinuingOperation" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_RawMaterialProductsMember" abstract="true" name="RawMaterialProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_SteelProductsMember" abstract="true" name="SteelProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_DownstreamProductsMember" abstract="true" name="DownstreamProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_PrecastProductsMember" abstract="true" name="PrecastProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_ConstructionProductsMember" abstract="true" name="ConstructionProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_GroundStabilizationProductsMember" abstract="true" name="GroundStabilizationProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_OtherProductMember" abstract="true" name="OtherProductMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_OtherGeographicalAreasMember" abstract="true" name="OtherGeographicalAreasMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cmc_ValuationAllowancesandReservesDeductionsChargedtoCostandExpense" abstract="false" name="ValuationAllowancesandReservesDeductionsChargedtoCostandExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cmc_ValuationAllowancesandReservesDeductionsChargedtoOtherAccounts" abstract="false" name="ValuationAllowancesandReservesDeductionsChargedtoOtherAccounts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
