Designation:A839−15StandardSpecificationforIron-PhosphorusPowderMetallurgyPartsforSoftMagneticApplications1ThisstandardisissuedunderthefixeddesignationA839;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoverspartsproducedfromiron-phosphoruspowdermetallurgymaterials.Thesepartsareusedinmagneticapplicationsrequiringhigherpermeabilityandelectricalresistivityandlowercoercivefieldstrengththanattainableroutinelyfrompartsproducedfromironpowder.1.2Twopowdertypesarecovered;TypeIcontainingnominally0.45wt.%phosphorus,andTypeIIcontainingnominally0.8wt.%phosphorus.1.3Thisspecificationdealswithpowdermetallurgypartsinthesinteredorannealedcondition.Shouldthesinteredpartsbesubjectedtoanysecondaryoperationthatcausesmechanicalstrain,suchasmachiningorsizing,theyshouldberesinteredorannealed.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesaremathematicalconversionstocustomary(cgs-emuandinch-pound)units,whichareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2A34/A34MPracticeforSamplingandProcurementTestingofMagneticMaterialsA596/A596MTestMethodforDirect-CurrentMagneticPropertiesofMaterialsUsingtheBallisticMethodandRingSpecimensA773/A773MTestMethodforDirectCurrentMagneticPropertiesofLowCoercivityMagneticMaterialsUsingHysteresigraphsB962TestMethodsforDensityofCompactedorSinteredPowderMetallurgy(PM)ProductsUsingArchimedes’PrincipleE1019TestMethodsforDeterminationofCarbon,Sulfur,Nitrogen,andOxygeninSteel,Iron,Nickel,andCobaltAlloysbyVariousCo...
