Designation:A312/A312M−17UsedinUSDOE-NEstandardsStandardSpecificationforSeamless,Welded,andHeavilyColdWorkedAusteniticStainlessSteelPipes1ThisstandardisissuedunderthefixeddesignationA312/A312M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecification2coversseamless,straight-seamwelded,andheavilycoldworkedweldedausteniticstainlesssteelpipeintendedforhigh-temperatureandgeneralcorrosiveservice.NOTE1—Whentheimpacttestcriterionforalow-temperatureservicewouldbe15ft·lbf[20J]energyabsorptionor15mils[0.38mm]lateralexpansion,someoftheausteniticstainlesssteelgradescoveredbythisspecificationareacceptedbycertainpressurevesselorpipingcodeswithoutthenecessityofmakingtheactualtest.Forexample,GradesTP304,TP304L,andTP347areacceptedbytheASMEPressureVesselCode,SectionVIIIDivision1,andbytheChemicalPlantandRefineryPipingCode,ANSIB31.3,forserviceattemperaturesaslowas−425°F[−250°C]withoutqualificationbyimpacttests.OtherAISIstainlesssteelgradesareusuallyacceptedforservicetemperaturesaslowas−325°F[−200°C]withoutimpacttesting.Impacttestingmay,undercertaincircumstances,berequired.Forexample,materialswithchromiumornickelcontentoutsidetheAISIranges,andformaterialwithcarboncontentexceeding0.10%,arerequiredtobeimpacttestedundertherulesofASMESectionVIIIDivision1whenservicetemperaturesarelowerthan−50°F[−45°C].1.2GradesTP304H,TP309H,TP309HCb,TP310H,TP310HCb,TP316H,TP321H,TP347H,andTP348HaremodificationsofGradesTP304,TP309Cb,TP309S,TP310Cb,TP310S,TP316,TP321,TP347,andTP348,andareintendedforserviceattemperatureswherecreepandstressrupturepropertiesareimportant.1.3Optionalsupplementaryrequirementsareprovidedforpipewhereagreaterdegreeoftestingisdesired.Thesesupplementaryrequirementscallforaddi...
