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1、Designation:A278/A278M–01StandardSpecificationforGrayIronCastingsforPressure-ContainingPartsfor1TemperaturesUpto650°F(350°C)Thisstandardisissuedunderthe®xeddesignationA278/A278M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastre
2、vision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope5.1.2Classofironrequiredandservicetemperature,1.1Thisspeci®cation2coversgrayironforcastingssuitable5.1.3Quantity,forpressure-containingpartsforu
3、seattemperaturesupto5.1.4HeatTreatment:650°F(350°C).5.1.4.1WhetherornotheattreatmentisrequiredforClass1.2ClassesofIron:40,45,50,55,and60castingstobeusedattemperaturesat1.2.1Castingsofallclassesaresuitableforuseupto450°F450°Forless(see6.2),(230°C).Fortemperaturesabove450°Fandupto650°F,only5.1
4、.4.2WhetherornotheattreatmentisrequiredforClassClass40,45,50,55,and60castingsaresuitable.275,300,325,350,380,and415castingstobeusedat1.2.2Castingsofallclassesaresuitableforuseupto230°C.temperaturesat230°Corless(see6.2),Fortemperaturesabove230°Candupto350°C,onlyClass5.1.5Thesizeofseparatelyca
5、sttestbartobepoured(see275,300,325,350,380,and415castingsaresuitable.Section9andTable1),5.1.6Thesizeoftestspecimentobemachinedfromtest2.ReferencedDocumentsbarsCorS,and2.1ASTMStandards:5.1.7Specialrequirements.A644TerminologyRelatingtoIronCastings346.MaterialsandManufactureE8TestMethodsforTen
6、sionTestingofMetallicMaterials6.1Castingsintendedforuseabove450°F(230°C)shallbe3.Terminologystress-relievedbyplacingtheminasuitablefurnaceata3.1De®nitionsofmanytermscommontograyironcastingstemperaturenotexceeding400°F(200°C)andheatingthemmaybefoundinTerminologyA644.uniformlytothetemperatures
7、andforthetimesspeci®edinTable2.Theheatingandcoolingratesshallbeuniformand4.Classi®cationshallnotbemorethan400°F/h(250°C/h)forcastingsof1-in.4.1Classi®cationbytensilestrength.(25-mm)maximumsection.Forheaviersectionsthemaximum4.1.1Castingsorderedtoth
