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Designation:A753–02StandardSpecificationforWroughtNickel-IronSoftMagneticAlloys(UNSK94490,K94840,N14076,N14080)1ThisstandardisissuedunderthefixeddesignationA753;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoverscommonlyusedwroughtnickel-ironsoftmagneticalloysproducedorsuppliedexpresslyforuseinmagneticcoresandotherpartsrequiringhighmagneticpermeability,highelectricalresistivity,lowcoercivefieldstrength,andlowcoreloss.1.2Thisspecificationcoversmaterialssuppliedbyapro-ducerorconvertertotheformandphysicalconditiondesiredforfabricationintopartsthatwilllaterbegivenafinalheattreatmenttoachievethedesiredmagneticcharacteristics.Itcoversmaterialssuppliedintheformofforgingbillet;hot-rolledplate,strip,andbar;cold-finishedbar;cold-rolledandannealedsheetandstrip;shapedbarandwire;andwire.1.2.1Thisspecificationdoesnotcovereitherpowdermet-allurgicallyproducedorcastparts.1.2.2Thisspecificationlistsrequirementsforstripproductshavingisotropicorsemi-isotropicmagneticpropertiesbutdoesnotincluderequirementsforanisotropicorsquarehysteresisloopalloysoralloysprocessedtoyieldflattenedhysteresisloopsbyuseofheattreatmentsinanappliedmagneticfield.1.2.3Thisspecificationdoesnotcoveralloysmodifiedbytheadditionofelementssuchassulfurandseleniumtoenhancemachinability.1.3Thevaluesstatedincustomary(cgs-emuandinch-pound)unitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitswhichareprovidedforinformationonlyandarenotconsideredstandard.2.ReferencedDocuments2.1ASTMStandards:A34/A34MPracticeforSamplingandProcurementTest-ingofMagneticMaterials2A340TerminologyofSymbolsandDefinitionsRelatingtoMagneticTesting2A341/A341MTestMethodforDirectCurrentMagneticPropertiesofMaterialsUsingdcPermeametersandtheBallisticTestMethods2A343TestMethodforAlternating-CurrentMagneticProp-ertiesofMaterialsatPowerFrequenciesUsingWattmeter-Ammeter-VoltmeterMethodand25-cmEpsteinTestFrame2A480/M480MSpecificationforGeneralRequirementsforFlat-RolledStainlessandHeat-ResistingSteelPlate,Sheet,andStrip3A484/A484MSpecificationforGeneralRequirementsforStainlessandHeat-ResistingSteelBarsandShapes,Car-bon,Rolledfrom“T”Rails3A555/A555MSpecificationforGeneralRequirementsforStainlessSteelWireandWireRods3A596/A596MTestMethodforDirect-CurrentMagneticPropertiesofMaterialsUsingtheBallisticMethodandRingSpecimens2A772TestMethodforacMagneticPermeabilityofMate-rialsUsingSinusoidalCurrent2A773/A773MTestMethodfordcMagneticPropertiesofMaterialsUsingRingandPermeameterProcedureswithdcElectronicHysteresigraphs2E527PracticeforNumberingMetalsandAlloys(UNS)4E1019TestMethodsforDeterminationofCarbon,Sulfur,Nitrogen,andOxygeninSteelandinIron,Nickel,andCobaltAlloys53.Terminology3.1ThetermsandsymbolsusedinthisspecificationaredefinedinTerminologyA340.4.Classification4.1Fourspecificalloytypesarecovered:AlloyTypeUNSNumberANominalRangeofNickel,%B1K9449043.5to46.52K9484047.0to49.03N1407675.0to78.04N1408079.0to82.0AUNSreferstotheUnifiedNumberingSystem,analloyidentificationsystemsupportedbyASTM.RefertoPracticeE527fordetails.1ThisspecificationisunderthejurisdictionofASTMCommitteeA06onMagneticProperties,andisthedirectresponsibilityofSubcommitteeA06.02onMaterialSpecifications.CurrenteditionapprovedOct.10,2002.PublishedNovember2002.OriginallypublishedasA753-78.LastpreviouseditionA753-97.2AnnualBookofASTMStandards,Vol03.04.3AnnualBookofASTMStandards,Vol01.03.4AnnualBookofASTMStandards,Vol01.01.5AnnualBookofASTMStandards,Vol03.05.1Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959,UnitedStates.BAlloyTypes3and4haveadditionsofmolybdenum,copper,andchromiumtoimprovemagneticperformance.4.2AlloyType2inthin-stripform(thicknesslessthanorequalto0.0200in.(0.508mm))isavailableintwodifferentgrades.Grade1issemi-isotropicandisrecommendedforuseintransformerlaminations.Grade2isisotropicandisrecom-mendedforuseinrotatingmachinerylaminations.Thesegradesaretheresultofdifferentmillprocessing(thatis,cold-rollingandannealing)practicesandcannotbecreatedbychangesinthefinalheattreatmentgiventothelaminations.5.OrderingInformation5.1Ordersformaterialconformingtothisspecificationshallincludethefollowinginformation:5.1.1Referencetothisspecificationandyearofissueorrevision.5.1.2Alloytype(Section6)andgradewhereappropriate.5.1.3Dimensionsandtolerances(Section11).5.1.4Quantity(weightornumberofpiecesasappropriate).5.1.5Formandcondition(Section7).5.1.6Magneticpropertyrequirementsiftheyareotherthanthoselistedinthisspecification.5.1.7Certificationofchemicalanalysisandmagneticqual-ityevaluation.5.1.8Markingandpackagingrequirements.5.1.9EndUse—Wheneverpossible,theusershouldspecifywhetherthematerialwillbemachined,blankedintoflatpieces,blankedandformed,deepdrawntoshape,woundintoacore,punchedintolaminations,orphoto-etched.Thiswillhelptheproducertoprovidethemostsuitablematerialfortheuser’sfa