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Designation:A770/A770M–03StandardSpecificationforThrough-ThicknessTensionTestingofSteelPlatesforSpecialApplications1ThisstandardisissuedunderthefixeddesignationA770/A770M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope*1.1Thisspecification2coverstheproceduresandaccep-tancestandardsforthedeterminationofreductionofareausingatensiontestspecimenwhoseaxisisperpendiculartotherolledsurfacesofsteelplates1in.[25mm]andgreaterinthickness.Theprincipalpurposeofthetestingistoprovideameasureoftheresistanceofasteelplatetolamellartearing.(SeeAppendixX1.)1.2Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedinde-pendentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththespecification.1.3Thisspecificationisexpressedinbothinch-poundandSIunits.However,unlesstheorderspecifiestheapplicable“M”specificationdesignation(SIunits),thematerialshallbefurnishedtoinch-poundunits.2.ReferencedDocuments2.1ASTMStandards:A370TestMethodsandDefinitionsforMechanicalTestingofSteelProducts33.OrderingInformation3.1Theinquiryandordershallincludethefollowing,ifrequired:3.1.1Supplementaryrequirementsthatareavailabletomeetenduserequirements(seeS1throughS5).3.1.2Specialrequirementsagreeduponbetweenthemanu-facturerandthepurchaser.4.TensionTests4.1NumberofTests:4.1.1Twotestsshallberequiredfromeachplate-as-rolled,exceptforplatessubjectedtoheattreatmentbyquenchingandtempering.Twotestsshallberequiredfromeachquenched-and-temperedplate.Thetestsshallberepresentativeoftheplateinitsfinalcondition.4.1.2Whenplatesarefurnishedbythemanufacturerinanunheat-treatedconditionandqualifiedbyheat-treatedspeci-mens(includingnormalized,normalizedandtempered,andquenchedandtempered),twotestsshallberequiredfromeachplate-as-rolled.NOTE1—Theterm“plate-as-rolled’’referstotheunitplaterolledfromaslabordirectlyfromaningot.Itdoesnotrefertotheconditionoftheplate.4.2LocationofTestCoupons—Takeonetestcouponateachendofeachplateasdefinedin4.1.Takethetestcouponsfromthecenteroftheplatewidth.4.3OrientationofTestSpecimens—Thelongitudinalaxisofthereducedsectionofthetestspecimensshallbeperpendiculartotherolledsurfaceoftheplate.4.4PreparationofTestSpecimens:4.4.1WeldedProlongations—Whenrequired,joinweldedprolongationstothesurface(s)oftheplatebeingtested.Thejoiningmethodusedshallbeonewhichresultsinaminimalheat-affectedzoneintheportionoftheplatetobetested.Shieldedmetalarc,friction,stud,orelectron-beamweldingmethodshaveproventobesuitable.4.4.2StandardTestSpecimens:4.4.2.1ThreetypesofstandardroundtensiontestspecimensareshowninFig.1andTable1.ForTypes1and2specimens,locatethecenterofthelengthofthereducedsectionattheapproximatemid-pointoftheplatethickness.ForType3specimens,locatetheweldfusionlineofoneplatesurfacewithin1⁄4in.[6mm]ofoneendofthereducedsection.4.4.2.2Forplatesfrom1in.[25mm]to11⁄4in.[32mm]inclusiveinthickness,useeitherthe0.350-in.[8.75-mm]Type1specimenorthe0.500-in.[12.5-mm]Type2specimen.4.4.2.3Forplatesover11⁄4in.to2in.[50mm]inclusiveinthickness,usethe0.500-in.[12.5-mm]Type2specimen.4.4.2.4Forplatesgreaterthan2in.[50mm]inthickness,usetheType3specimen.1ThisspecificationisunderthejurisdictionofASTMCommitteeA01onSteel,StainlessSteel,andRelatedAlloysandisthedirectresponsibilityofSubcommitteeA01.11onSteelforBoilersandPressureVessels.CurrenteditionapprovedMay10,2003.PublishedJuly2003.Originallyapprovedin1980.Lastpreviouseditionapprovedin2001asA770–86(2001).2ForASMEBoilerandPressureVesselCodeapplications,seerelatedSpecifi-cationSA-770/SA-770MinSectionIIofthatCode.3AnnualBookofASTMStandards,Vol01.03.1*ASummaryofChangessectionappearsattheendofthisstandard.Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959,UnitedStates.4.4.3AlternativeTestSpecimens—ThealternativetestspecimensinFig.2andTable2maybeusedinplaceofthestandardspecimensinFig.1andTable1.4.4.3.1Forplatesover2in.[50mm]inthickness,TypeAorTypeBspecimensmaybeused.TheTypeAspecimenprovidesareducedsectionlengthgreaterthantheplatethickness.TheTypeBspecimenprovidesareducedsectionlengthof21⁄4in.[57mm]withitscenteratthemid-thicknessoftheplate.Overaminimumplatethicknessdeterminedbythespecimenendconfiguration,noweldedprolongationsmaybeneededfortheTypeBspecimen.Forplatesover41⁄4in.[108mm]inthickness,theTypeCspecimenmaybeused.Forplatesover6in.[150mm]inthickness,aseriesoftwoormoreTypeAorTypeCspecimenswithreducedsectionsof4in.[100mm]orlessmaybeusedtocoverthefullthicknessoftheplate.Thenumberoftestsrequiredwilldependuponthethicknessoftheplatebeingtestedandthereducedsectionlengthselected.4.4.3.2Forplatesover1in.[25mm]inthickness,aseriesofbutton-headspecimensshowninFig.2andTable2maybeused.Thetestspecime