Designation:A1086−13StandardSpecificationforThin-GaugeNonorientedElectricalSteelFullyProcessedTypes1ThisstandardisissuedunderthefixeddesignationA1086;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversthedetailedrequirementstowhichflat-rolledthin-gaugenonorientedfullyprocessedelec-tricalsteelshallconform.Nominalthicknessesincludedinthisspecificationare0.004in.(0.10mm)to0.012in.(0.30mm).1.1.1RefertoSpecificationA677forpropertiesofflat-rollednonorientedfullyprocessedelectricalsteelinnominalthicknessesof0.014in.(0.36mm)to0.025in.(0.64mm).1.1.2RefertoSpecificationA876forpropertiesofflat-rolledgrain-orientedfullyprocessedelectricalsteel.1.1.3Thin-gaugenonorientedelectricalsteelswithahighsiliconcontent(typically6½%)manufacturedusingsiliconvapor-depositionorsimilarprocessesarenotincludedinthisspecification.1.2Thesteelcoveredinthisspecificationisproducedtospecifiedmaximumcorelossvaluesandisintendedprimarilyforuseinrotatingelectricalmachineryandotherelectromag-neticdevicesoperatingatmoderatetoelevatedfrequencies(100Hzandgreater).Desirablecorelossandpermeabilitycharacteristicsaredevelopedduringmillprocessing;however,laminationmanufacturingprocessesmayadverselyaffectthesemill-producedproperties.Additionalstress-reliefheattreat-mentbytheusermaythereforebehelpfulinremediatingthesepropertiesinthemanufacturedlaminations.Stress-reliefan-nealingisdiscussedfurtherinAppendixX2.1.3Thesethin-gaugenonorientedfullyprocessedelectricalsteelsarelow-carbon,silicon-iron,orsilicon-aluminum-ironalloystypicallycontaining2.5to3.5%siliconandasmallamountofaluminum.1.4Thevaluesstatedincustomary(cgs-emuandinch-pound)unitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitswhichareprovidedforinformationonlyandarenotconsideredst...
