Designation:A278/A278M−01(Reapproved2015)StandardSpecificationforGrayIronCastingsforPressure-ContainingPartsforTemperaturesUpto650°F(350°C)1ThisstandardisissuedunderthefixeddesignationA278/A278M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thisspecification2coversgrayironforcastingssuitableforpressure-containingpartsforuseattemperaturesupto650°F(350°C).1.2ClassesofIron:1.2.1Castingsofallclassesaresuitableforuseupto450°F(230°C).Fortemperaturesabove450°Fandupto650°F,onlyClass40,45,50,55,and60castingsaresuitable.1.2.2Castingsofallclassesaresuitableforuseupto230°C.Fortemperaturesabove230°Candupto350°C,onlyClass275,300,325,350,380,and415castingsaresuitable.1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.2.ReferencedDocuments2.1ASTMStandards:3A644TerminologyRelatingtoIronCastingsE8TestMethodsforTensionTestingofMetallicMaterials3.Terminology3.1DefinitionsofmanytermscommontograyironcastingsmaybefoundinTerminologyA644.4.Classification4.1Classificationbytensilestrength.4.1.1Castingsorderedtothisspecificationareclassifiedbasedupontheminimumtensilestrengthoftheironinksi,inEnglishunits.Class25hasaminimumspecifiedtensilestrengthof25ksi.4.1.2CastingsorderedtothisspecificationareclassifiedbasedupontheminimumtensilestrengthoftheironinMPa,inMetricunits.Class150hasaminimumspecifiedtensilestrengthof150MPa.5.OrderingInformation5.1Ordersformaterialinthisspecificationshouldincludethefollowinginformation:5.1.1ASTMdesignationandyeardate,5.1.2Classofironrequiredandservicete...
