Designation:A249/A249M−16aUsedinUSDOE-NEStandardsStandardSpecificationforWeldedAusteniticSteelBoiler,Superheater,Heat-Exchanger,andCondenserTubes1ThisstandardisissuedunderthefixeddesignationA249/A249M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecification2coversnominal-wall-thicknessweldedtubesandheavilycoldworkedweldedtubesmadefromtheausteniticsteelslistedinTable1,withvariousgradesintendedforsuchuseasboiler,superheater,heatexchanger,orcondensertubes.1.2GradesTP304H,TP309H,TP309HCb,TP310H,TP310HCb,TP316H,TP321H,TP347H,andTP348HaremodificationsofGradesTP304,TP309S,TP309Cb,TP310S,TP310Cb,TP316,TP321,TP347,andTP348,andareintendedforhigh-temperatureservicesuchasforsuperheatersandreheaters.1.3Thetubingsizesandthicknessesusuallyfurnishedtothisspecificationare1⁄8in.[3.2mm]ininsidediameterto12in.[304.8mm]inoutsidediameterand0.015to0.320in.[0.4to8.1mm],inclusive,inwallthickness.Tubinghavingotherdimensionsmaybefurnished,providedsuchtubescomplywithallotherrequirementsofthisspecification.1.4Mechanicalpropertyrequirementsdonotapplytotubingsmallerthan1⁄8in.[3.2mm]ininsidediameteror0.015in.[0.4mm]inthickness.1.5Optionalsupplementaryrequirementsareprovidedand,whenoneormoreofthesearedesired,eachshallbesostatedintheorder.1.6Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.Theinch-poundunitsshallapplyunlessthe“M”designationofthisspecificationisspecifiedintheorder.1.7Thefollowingsafetyhazardscaveatpertainsonlytothetestmethoddes...
