Designation:A986/A986M−01(Reapproved2016)StandardSpecificationforMagneticParticleExaminationofContinuousGrainFlowCrankshaftForgings1ThisstandardisissuedunderthefixeddesignationA986/A986M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversthemagneticparticleexami-nationofforgedcontinuousgrainflow(CGF)crankshaftsintendedformediumspeeddieselengines.1.2Forthepurposeofmagneticparticleindicationassessment,thecrankshaftisdividedintofourzonesofdecreasingoperationalstress.Acceptancecriteriahavebeensetforeachzone.1.3Theenginestowhichthesecrankshaftsarefittedarecommonlyusedfordieselelectriclocomotives,marinepropulsion,andpowergeneration.Enginesfueledbynaturalgasalsofallintothismediumspeedcategory.1.4SpecificationA983/A983MisaproductspecificationthatcoversthemanufactureofCGFcrankshafts.1.5Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththespecifi-cation.2.ReferencedDocuments2.1ASTMStandards:2A788/A788MSpecificationforSteelForgings,GeneralRe-quirementsA966/A966MPracticeforMagneticParticleExaminationofSteelForgingsUsingAlternatingCurrentA983/A983MSpecificationforContinuousGrainFlowForgedCarbonandAlloySteelCrankshaftsforMediumSpeedDieselEngines3.OrderingInformation3.1SpecificationA983/A983MrequiresthatcrankshaftsmadetothatspecificationbeexaminedinaccordancewithSpecificationA986/A986Mformagneticparticleexamination.Itistheresponsibilityofthepurchasertospecifyanychangestothezoneallocationsforthecrankshaftsurfaces.4.Procedure4.1MagneticparticleexaminationshallbeconductedinaccordancewithPracticeA966/A966M.Th...
