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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 3qeef4nPQma1XM56ouDL1A==

<SEC-DOCUMENT>0001179110-06-009583.txt : 20060501
<SEC-HEADER>0001179110-06-009583.hdr.sgml : 20060501
<ACCEPTANCE-DATETIME>20060501153729
ACCESSION NUMBER:		0001179110-06-009583
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060301
FILED AS OF DATE:		20060501
DATE AS OF CHANGE:		20060501

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			LONE STAR TECHNOLOGIES INC
		CENTRAL INDEX KEY:			0000791348
		STANDARD INDUSTRIAL CLASSIFICATION:	STEEL PIPE & TUBES [3317]
		IRS NUMBER:				752085454
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		15660 N DALLAS PKWY
		STREET 2:		SUITE 500
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75248
		BUSINESS PHONE:		9727706401

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			KELLEY ROBERT
		CENTRAL INDEX KEY:			0001106716

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-12881
		FILM NUMBER:		06794842

	BUSINESS ADDRESS:	
		STREET 1:		333 WEST MAIN, SUITE 300
		STREET 2:		NEUSTADT PLAZA
		CITY:			ARDMORE
		STATE:			OK
		ZIP:			73401
		BUSINESS PHONE:		5802240200

	MAIL ADDRESS:	
		STREET 1:		KELLCO INVESTMENTS INC.
		STREET 2:		PO BOX 1507
		CITY:			ARDMORE
		STATE:			OK
		ZIP:			73401
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4/A -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2006-03-01</periodOfReport>

    <dateOfOriginalSubmission>2006-03-03</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000791348</issuerCik>
        <issuerName>LONE STAR TECHNOLOGIES INC</issuerName>
        <issuerTradingSymbol>LSS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001106716</rptOwnerCik>
            <rptOwnerName>KELLEY ROBERT</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>333 WEST MAIN, STE. 300</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ARDMORE</rptOwnerCity>
            <rptOwnerState>OK</rptOwnerState>
            <rptOwnerZipCode>73402</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2006-03-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2400</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>10300</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Grant of 2,400 restricted stock units under Issuer's 2004 Long-Term Incentive Plan.  Unless vesting occurs earlier due to the attainment of performance targets, shares vest on March 1, 2012.  Vested shares will not be issued until the Reporting Person ceases to be a director of the Issuer.  This amendment is being filed to disclose the information in the preceding sentence.</footnote>
        <footnote id="F2">Includes 2,500 restricted stock units and 2,400 restricted shares granted prevously under the 2004 Long-Term Incentive Plan.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Robert Kelley by Robert F. Spears, Attorney-in-Fact</signatureName>
        <signatureDate>2006-05-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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