ASTM A1008 A1008M - 15

Designation:A1008/A1008M−15StandardSpecificationforSteel,Sheet,Cold-Rolled,Carbon,Structural,High-StrengthLow-Alloy,High-StrengthLow-AlloywithImprovedFormability,SolutionHardened,andBakeHardenable1ThisstandardisissuedunderthefixeddesignationA1008/A1008M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationcoverscold-rolled,carbon,structural,high-strengthlow-alloy,high-strengthlow-alloywithim-provedformability,solutionhardened,andbakehardenablesteelsheet,incoilsandcutlengths.1.2Coldrolledsteelsheetisavailableinthedesignationsaslistedin4.1.1.3ThisspecificationdoesnotapplytosteelstripasdescribedinSpecificationA109/A109M.1.4ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.2.ReferencedDocuments2.1ASTMStandards:2A109/A109MSpecificationforSteel,Strip,Carbon(0.25MaximumPercent),Cold-RolledA370TestMethodsandDefinitionsforMechanicalTestingofSteelProductsA568/A568MSpecificationforSteel,Sheet,Carbon,Structural,andHigh-Strength,Low-Alloy,Hot-RolledandCold-Rolled,GeneralRequirementsforA941TerminologyRelatingtoSteel,StainlessSteel,RelatedAlloys,andFerroalloysE18TestMethodsforRockwellHardnessofMetallicMa-terialsE517TestMethodforPlasticStrainRatiorforSheetMetalE646TestMethodforTensileStrain-HardeningExponents(n-Values)ofMetallicSheetMaterials3.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1Fordefinitionsofothertermsusedinthisspecification,refertoTerminologyA941.3.1.2aging,n—lossofductilitywithanincreaseinhardness,yieldstrength,andtensilestrengththatoccurswhensteelthathasbeenslightlycoldworked(suchasbytemperrolling)isstoredforsometime.3.1.2.1Discussion—Agingincreasesthetendencyofasteeltoexhibitstretcherstrainsandfluting.3.1.3bakehardenablesteel,n—steelinwhichsignificantagingisrealizedwhenmoderateheattreatment,suchasthatusedforpaintbaking,followsstrainingorcoldworking.3.1.4inclusioncontrol,n—theprocessofreducingthevolumefractionofinclusionsormodifyingtheshapeofinclusionstoimproveformability,weldability,andmachinabil-ity.3.1.4.1Discussion—Inclusions,especiallythoseelongatedduringtherollingprocess,createtheconditionsforinitiatingorpropagatingcracks,orboth,whenthematerialisstretchedorbentduringthemanufactureofapart.Theadverseeffectsofinclusionsareminimizedbyreducingthecontentofinclusionsinthesteelorbyalteringtheshapeofinclusions,orboth,throughtheuseofadditionsduringthesteelmakingprocessthatchangetheelongatedshapeoftheinclusionstolessharmfulsmall,welldispersedglobularinclusions.3.1.5solid-solutionhardenedsteelorsolutionhardenedsteel,n—steelstrengthenedthroughadditionsofelements,suchasMn,P,orSi,thatcanbedissolvedwithinthecrystallinestructureofsteels.3.1.5.1Discussion—Alloyingelementsthatformasolid-solutionwithironprovidestrengtheningasaresultoflocaldistortionsinatomicarrangements,whichariseasaresultofthemismatchbetweentheatomicsizesofsuchelementsandthatofiron.1ThisspecificationisunderthejurisdictionofASTMCommitteeA01onSteel,StainlessSteelandRelatedAlloysandisthedirectresponsibilityofSubcommitteeA01.19onSteelSheetandStrip.CurrenteditionapprovedMay1,2015.PublishedMay2015.Originallyapprovedin2000.Lastpreviouseditionapprovedin2013asA1008/A1008M–13.DOI:10.1520/A1008_A1008M-15.2ForreferencedASTMstandards,visittheASTMwebsite,@astm.org.ForAnnualBookofASTMStandardsvolumeinformation,refertothestandard’sDocumentSummarypageontheASTMwebsite.*ASummaryofChangessectionappearsattheendofthisstandardCopyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959.UnitedStates1CopyrightbyASTMInt'l(allrightsreserved);MonJan1822:01:56EST20163.1.6stabilization,n—additionofoneormorenitride-orcarbide-formingelements,orboth,suchastitaniumandcolumbium,tocontroltheleveloftheinterstitialelementsofcarbonandnitrogeninthesteel.3.1.6.1Discussion—Stabilizingimprovesformabilityandincreasesresistancetoaging.3.1.7vacuumdegassing,n—processofrefiningliquidsteelinwhichtheliquidisexposedtoavacuumaspartofaspecialtechniqueforremovingimpuritiesorfordecarburizingthesteel.4.Classification4.1Cold-rolledsteelsheetisavailableinthefollowingdesignations:4.1.1CommercialSteel(CSTypesA,B,andC),4.1.2CommercialSteel(CSTypesAandBcombinedwithchemistrygradeperSpecificationA568/A568MTableX2.3,4.1.3DrawingSteel(DSTypesAandB,asspecifiedinTable1),4.1.4DrawingSteel(DSTypeAandBcombinedwithchemistrygradeperSpecificationA568/A568MTableX2.3,4.1.5CommercialSteelChemistrygradeperSpecificationA568/A568MTableX2.1,withnotypespecified(CS–1005,CS–1008,CS–1020,andsoforth),4.1.6DeepDrawingSteel(DDS),4.1.7ExtraDeepDrawingSteel(EDDS),4.1.