Designation:A758/A758M−14StandardSpecificationforWrought-CarbonSteelButt-WeldingPipingFittingswithImprovedNotchToughness1ThisstandardisissuedunderthefixeddesignationA758/A758M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationcoverswrought-carbonsteelbutt-weldingseamlessorweldedfittingsspeciallyprocessedtoensurebetternotchtoughnessthanthattobeexpectedinfittingsmanufacturedtotherequirementsofSpecificationA234/A234M.1.1.1Includedareelbows,caps,tees,reducers,andothertypefittingscoveredbyASMEB16.9.1.1.2Heattreatmentisrequiredforallfittings.1.1.3Fittingswithmandatoryradiographicexaminationofweldsareincluded.1.1.4Supplementaryrequirementsareprovidedforusewhenadditionaltestingorexaminationisdesired.1.1.5Castfittings,andfittingsformedfromallweldmetal,arenotincluded.1.2Severaltypeoffittingsareprovided,asfollows:TypeHeatTreatmentRequiredWeldSeamFinish(5.3.2)RadiographyRequired?30normalizeUW-35no31normalizeUW-35yes32normalizeUW-35andgroundflushyes40normalizeandtemperUW-35no41normalizeandtemperUW-35yes42normalizeandtemperUW-35andgroundflushyes50quenchandtemperUW-35no51quenchandtemperUW-35yes52quenchandtemperUW-35andgroundflushyes1.3Itshallbetheresponsibilityofthepurchasertodeter-minewhethermaterialmeetingtherequirementsofthisspeci-ficationissatisfactoryfortheserviceapplication.1.4Thisspecificationisexpressedinbothinch-poundunitsandSIunits.However,unlesstheorderspecifiestheapplicable“M”specificationdesignation(SIunits),thematerialshallbefurnishedtoinch-poundunits.1.5ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-c...
