Designation:A48/A48M−03(Reapproved2016)StandardSpecificationforGrayIronCastings1ThisstandardisissuedunderthefixeddesignationA48/A48M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.ThisspecificationreplacesFederalSpecificationQQ-I-652.1.Scope1.1Thisspecificationcoversgrayironcastingsintendedforgeneralengineeringusewheretensilestrengthisamajorconsideration.Castingsareclassifiedonthebasisofthetensilestrengthoftheironinseparatelycasttestbars.1.1.1Thisspecificationsubordinateschemicalcompositiontotensilestrength.1.2Castingsproducedtothisspecificationaregradedonthebasisofminimumtensilestrengthobtainedinspecialtestcouponsdesignedtostandardizecoolingrate.Thetensilestrengthdevelopedincertaincastingsectionsmayvaryfromtestcouponvalues(seeX1.2).1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.2.ReferencedDocuments2.1ASTMStandards:A644TerminologyRelatingtoIronCastingsE8TestMethodsforTensionTestingofMetallicMaterials2.2MilitaryStandard:MIL-STD-129MarkingforShipmentandStorage22.3FederalStandard:FederalStandardNo.123MarkingforShipment(CivilAgencies)23.Terminology3.1Definitions:3.1.1DefinitionsformanytermscommontograyironcastingsarefoundinTerminologyA644.4.Classification4.1Castingsorderedandproducedinaccordancewiththisspecificationareclassifiedintoanumberofgradesbasedonthepropertiesofseparatelycasttestbars(Tables1and2).Eachclassisdesignatedbyanumberfollowedbyaletter.Thenumberindicatestheminimumtensilestrengthofthesepa-ratelycasttestbar,andtheletterindicatesthesizeofthetestbar.Examplesofpr...
