Designation:A456/A456M−08(Reapproved2018)StandardSpecificationforMagneticParticleExaminationofLargeCrankshaftForgings1ThisstandardisissuedunderthefixeddesignationA456/A456M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisisanacceptancespecificationforthemagneticparticleinspectionofforgedsteelcrankshaftshavingmainbearingjournalsorcrankpins4in.[200mm]orlargerindiameter.1.2Therearethreeclasses,withacceptancestandardsofincreasingseverity:1.2.1Class1.1.2.2Class2(originallythesoleacceptancestandardofthisspecification).1.2.3Class3(formerlycoveredinSupplementaryRequire-mentS1ofSpecificationA456–64(1970)).1.3Thisspecificationisnotintendedtocovercontinuousgrainflowcrankshafts(seeSpecificationA983/A983M);however,SpecificationA986/A986Mmaybeusedforthispurpose.NOTE1—SpecificationA668/A668Misaproductspecificationwhichmaybeusedforslab-forgedcrankshaftforgingsthatareusuallytwistedinordertosetthecrankpinangles,orforbarrelforgedcrankshaftswherethecrankpinsaremachinedintheappropriateconfigurationfromacylindricalforging.1.4ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.5Unlesstheorderspecifiestheapplicable“M”specifica-tiondesignation,thematerialshallbefurnishedtotheinchunits.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2A275/A275MPracticeforMagneticParticleExaminationofSt...
