Designation:A376/A376M−17UsedinUSDOE-NEstandardsStandardSpecificationforSeamlessAusteniticSteelPipeforHigh-TemperatureService1ThisstandardisissuedunderthefixeddesignationA376/A376M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecification2coversseamlessausteniticsteelpipeintendedforhigh-temperatureservice.AmongthegradescoveredareHgradesandnitrogengradesthatarespecificallyintendedforhigh-temperatureservice.NOTE1—Thisspecificationwasoriginallydevelopedforuseforpipinginthecentralstationsofelectric-powergeneratingthermalplants.However,itsuseisnotrestrictedtosuchapplicationsanditmaybeusedinotherapplicationsforwhichtheattributesofthematerials,asdefinedbythisspecification,areappropriate.1.2Optionalsupplementaryrequirements(S1throughS10)areprovided.Thesesupplementaryrequirementsspecifyaddi-tionalteststhatwillbemadeonlywhenstatedintheorder,togetherwiththenumberofsuchtestsrequired.1.3GradesTP321andTP321Hhavelowerstrengthrequire-mentsfornominalwallthicknessesgreaterthan3⁄8in.[9.5mm].1.4Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.Theinch-poundunitsshallapplyunlessthe“M”designationofthisspecificationisspecifiedintheorder.NOTE2—ThedimensionlessdesignatorsNPS(nominalpipesize)andDN(DiametreNominel)havebeensubstitutedinthisstandardforsuchtraditionaltermsas“nominaldiameter,”“size,”and“nominalsize.”1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,Guide...
