Designation:A275/A275M−15StandardPracticeforMagneticParticleExaminationofSteelForgings1ThisstandardisissuedunderthefixeddesignationA275/A275M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thispractice2coversaprocedureformagneticparticleexaminationofsteelforgings.Theprocedurewillproduceconsistentresultsuponwhichacceptancestandardscanbebased.Thispracticedoesnotcontainacceptancestandardsorrecommendedqualitylevels.1.2Onlydirectcurrentorrectifiedalternating(fullorhalfwave)currentshallbeusedastheelectricpowersourceforanyofthemagnetizingmethods.Alternatingcurrentisnotpermit-tedbecauseitscapabilitytodetectsubsurfacediscontinuitiesisverylimitedandthereforeunsuitable.1.2.1Portablebatterypoweredelectromagneticyokesareoutsidethescopeofthispractice.NOTE1—GuideE709maybeutilizedformagneticparticleexaminationinthefieldformachinerycomponentsoriginallymanufacturedfromsteelforgings.1.3Theminimumrequirementsformagneticparticleex-aminationshallconformtopracticestandardsofPracticeE1444/E1444M.IftherequirementsofthispracticeareinconflictwiththerequirementsofPracticeE1444/E1444M,therequirementsofthispracticeshallprevail.1.4Thispracticeandtheapplicablematerialspecificationsareexpressedinbothinch-poundunitsandSIunits.However,unlesstheorderspecifiestheapplicable“M”specificationdesignation[SIunits],thematerialshallbefurnishedtoinch-poundunits.1.5ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itisthe...
