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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 VLx6ojjfK4UAWaGHhOSKDIJU0ZBGGW31kUpejjyOL8NotDzRAKboi8wHPJxta4QO
 9p+5Kjl7NvjqDevAVIRwPw==

<SEC-DOCUMENT>0000276889-03-000010.txt : 20030701
<SEC-HEADER>0000276889-03-000010.hdr.sgml : 20030701
<ACCEPTANCE-DATETIME>20030630173511
ACCESSION NUMBER:		0000276889-03-000010
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20021101
FILED AS OF DATE:		20030701

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BALLOU ROBERT C
		CENTRAL INDEX KEY:			0001232999

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-05725
		FILM NUMBER:		03765747

	BUSINESS ADDRESS:	
		STREET 1:		4971 BIRDIE LANE
		CITY:			ANN ARBOR
		STATE:			MI
		ZIP:			48103

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			QUANEX CORP
		CENTRAL INDEX KEY:			0000276889
		STANDARD INDUSTRIAL CLASSIFICATION:	ROLLING DRAWING & EXTRUDING OF NONFERROUS METALS [3350]
		IRS NUMBER:				381872178
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1031

	BUSINESS ADDRESS:	
		STREET 1:		1900 W LOOP S STE 1500
		STREET 2:		ATTN THOMAS M BEWLEY
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77027
		BUSINESS PHONE:		7139614600

	MAIL ADDRESS:	
		STREET 1:		1900 WEST LOOP SOUTH
		STREET 2:		SUITE 1500
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77027
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>c0001232999d20030630f4af.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<ownershipDocument><schemaVersion>X0101</schemaVersion>    <documentType>4/A</documentType><periodOfReport>2002-11-01</periodOfReport><dateOfOriginalSubmission>2002-11-05</dateOfOriginalSubmission><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0000276889</issuerCik><issuerName>QUANEX CORP</issuerName>        <issuerTradingSymbol>NX</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001232999</rptOwnerCik><rptOwnerName>BALLOU ROBERT C</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>  </rptOwnerStreet1><rptOwnerStreet2>  </rptOwnerStreet2><rptOwnerCity>  </rptOwnerCity><rptOwnerState>  </rptOwnerState><rptOwnerZipCode>  </rptOwnerZipCode></reportingOwnerAddress><reportingOwnerRelationship><isDirector>0</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>1</isOther><officerTitle></officerTitle><otherText>President - Vehicular Products</otherText></reportingOwnerRelationship></reportingOwner><nonDerivativeSec
urity><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2002-11-01</value></transactionDate><deemedExecutionDate><value>2002-11-04</value></deemedExecutionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>J</transactionCode><equitySwapInvolved>0</equitySwapInvolved><footnoteId id="F1"/></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>25.758</value><footnoteId id="F2"/></transactionShares><transactionValue><value>35.7187</value></transactionValue><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>51.003</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value></value></natureOfOwnership></ownershipNature></nonDerivativeSecurity><f
ootnotes><footnote id="F1">Shares acquired through Employee Stock Purchase Plan.</footnote><footnote id="F2">14.558 shares were omitted from the reporting person's original Form 4 for 11-06-2002, and also were omitted from eight Forms 4 filed by the reporting person after his original Form 4 was filed.</footnote></footnotes><ownerSignature><signatureName>Terry M. Murphy</signatureName><signatureDate>2003-06-30</signatureDate></ownerSignature></ownershipDocument>

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</SEC-DOCUMENT>
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