ASTM A 53 A 53M-2007(3)

ASTM材料标准

analysisshallbeinaccordancewithTestMethods,Practices,7.2.2Iforderedforclosecoiling,thepipeshallstandbeingandTerminologyA751.

bentcoldthrough180°aroundacylindricalmandrel,the6.ProductAnalysis

diameterofwhichiseighttimesthespeci edoutsidediameterofthepipe,withoutfailure.

6.1Thepurchaserispermittedtoperformananalysisoftwo7.2.3Double-extra-strongpipeoverNPS11 4[DN32]needpipesfromeachlotof500lengths,orfractionthereof.Samplesnotbesubjectedtothebendtest.forchemicalanalysis,exceptforspectrographicanalysis,shallbetakeninaccordancewithPracticeE1806.Thechemical7.3FlatteningTest:

compositionthusdeterminedshallconformtotherequirements7.3.1The atteningtestshallbemadeonweldedpipeovergiveninTable1.

NPS2[DN50]inextra-strongweightorlighter.6.2Iftheanalysisofeitherpipedoesnotconformtothe7.3.2SeamlessPipe:

requirementsgiveninTable1,analysesshallbemadeon7.3.2.1Althoughtestingisnotrequired,pipeshallbeadditionalpipesofdoubletheoriginalnumberfromthesamecapableofmeetingthe atteningtestrequirementsofSupple-lot,eachofwhichshallconformtothespeci edrequirements.mentaryRequirementS1,iftested.

7.3.3Electric-Resistance-WeldedPipe:

7.MechanicalProperties7.3.3.1Atestspecimenatleast4in.[100mm]inlength7.1TensionTest:

shallbe attenedcoldbetweenparallelplatesinthreesteps,7.1.1Fortensiontestsotherthantransverseweldtensionwiththeweldlocatedeither0°or90°fromthelineofdirectiontests,theyieldstrengthcorrespondingtoapermanentoffsetofofforceasrequiredby7.3.3.2or7.3.3.3,whicheveris0.2%ofthegagelengthortoanextensionof0.5%ofthegageapplicable.Duringthe rststep,whichisatestforductilityoflengthunderload,thetensilestrength,andtheelongationin2theweld,exceptasallowedby7.3.5,7.3.6,and7.3.7,nocracksin.or50mmshallbedetermined,andthetensiontestresultsorbreaksontheinsideoroutsidesurfaceattheweldshallbeshallconformtotheapplicabletensilepropertyrequirementspresentbeforethedistancebetweentheplatesislessthantwogiveninTable2.

thirdsofthespeci edoutsidediameterofthepipe.Asasecond7.1.2Fortransverseweldtensiontests,thetensilestrengthstep,the atteningshallbecontinuedasatestforductilityshallbedetermined,andthetensiontestresultsshallconformawayfromtheweld.Duringthesecondstep,exceptasallowedtotheapplicabletensilestrengthrequirementgiveninTable2.by7.3.6and7.3.7,nocracksorbreaksontheinsideoroutside7.1.3Electric-resistance-weldedpipeNPS8[DN200]orsurfaceawayfromtheweldshallbepresentbeforethedistancelargershallbetestedusingtwotransversetestspecimens,onebetweentheplatesislessthanonethirdofthespeci edoutsidetakenacrosstheweldandonetakenoppositetheweld.

diameterofthepipebutisnotlessthan vetimesthespeci ed7.1.4Transversetensiontestspecimensshallbeapproxi-wallthicknessofthepipe.Duringthethirdstep,whichisatestmately11 2in.[38mm]wideinthegagelengthandshallforsoundness,the atteningshallbecontinueduntilthetestrepresentthefullwallthicknessofthepipefromwhichthetestspecimenbreaksortheoppositewallsofthetestspecimenspecimenswerecut.meet.Evidenceoflaminatedorunsoundmaterialorofincom-7.2BendTest:

pleteweldthatisrevealedbythe atteningtestshallbecause7.2.1ForpipeNPS2[DN50]orsmaller,asufficientlengthforrejection.

ofpipeshallbecapableofbeingbentcoldthrough90°around7.3.3.2Forpipeproducedinsinglelengths,the atteningacylindricalmandrel,thediameterofwhichistwelvetimesthetestspeci edin7.3.3.1shallbemadeusingatestspecimenspeci edoutsidediameterofthepipe,withoutdevelopingtakenfromeachendofeachlengthofpipe.Thetestsfromeachcracksatanyportionandwithoutopeningtheweld.

endshallbemadealternatelywiththeweldat0°andat90°fromthelineofdirectionofforce.

TABLE2TensileRequirements

7.3.3.3Forpipeproducedinmultiplelengths,the atteningtestspeci edin7.3.3.1shallbemadeasfollows:

GradeA

GradeB(1)Testspecimenstakenfrom,andrepresentativeof,theTensilestrength,min,psi[MPa]48000[330]60000[415]Yieldstrength,min,psi[MPa]30000[205]

35000[240]

frontendofthe rstpipeintendedtobesuppliedfromeachElongationin2in.or50mm

A,B

A,B

coil,thebackendofthelastpipeintendedtobesuppliedfromA

Theminimumelongationin2in.[50mm]shallbethatdeterminedbytheeachcoil,andeachsideofanyintermediateweldstoplocationfollowingequation:

shallbe attenedwiththeweldlocatedat90°fromthelineofe5625000[1940]A0.2/U0.9directionofforce.

where:

(2)Testspecimenstakenfrompipeatanytwolocationse=minimumelongationin2in.or50mminpercent,roundedtothenearest

intermediatetothefrontendofthe rstpipeandthebackendpercent,

A=thelesserof0.75in.2[500mm2]andthecross-sectionalareaofthe

ofthelastpipeintendedtobesuppliedfromeachcoilshallbetensiontestspecimen,calculatedusingthespeci edoutsidediameterof attenedwiththeweldlocatedat0°fromthelineofdirectionthepipe,orthenominalwidthofthetensiontestspecimenandtheofforce.

speci edwallthicknessofthepipe,withthecalculatedvalueroundedtothenearest0.01in.2[1mm2],and

7.3.3.4Forpipethatistobesubsequentlyreheatedthrough-U=speci edminimumtensilestrength,psi[MPa].

outitscrosssectionandhotformedbyareducingprocess,theB

SeeTableX4.1orTableX4.2,whicheverisapplicable,fortheminimummanufacturershallhavetheoptionofobtainingthe atteningelongationvaluesthatarerequiredforvariouscombinationsoftensiontesttestspecimensrequiredby7.3.3.2or7.3.3.3,whicheverisspecimensizeandspeci edminimumtensile

strength.

applicable,eitherpriortooraftersuchhotreducing.

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