Designation:A247−17StandardTestMethodforEvaluatingtheMicrostructureofGraphiteinIronCastings1ThisstandardisissuedunderthefixeddesignationA247;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoverstheclassificationofgraphiteincastironsintermsoftype,distribution,andsizebyvisualcomparisontoreferencephotomicrographs.Thistestmethodisintendedtobeapplicableforalliron-carbonalloyscontaininggraphiteparticles,andmaybeappliedtograyirons,malleableirons,compactedgraphiteirons,andtheductile(nodular)irons.1.2Thereferencephotomicrographsincludedinthistestmethodareinnowaytobeconstruedasspecifications.Inanappropriatespecificationforaspecificmaterialwheregraphitemicrostructureisanimportantconsideration,thistestmethodmaybeusedasareferencetoconciselydefinethegraphitemicrostructurerequired.1.3Thesereferencephotomicrographsareofferedprimarilytopermitaccuratereportingofmicrostructuresofcastironsandtofacilitatethecomparisonofreportsbydifferentlabora-toriesorinvestigators.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2E3GuideforPreparationofMetallographicSpecimens2.2ASTMAdjuncts...
