Designation:A726−05(Reapproved2010)StandardSpecificationforCold-RolledMagneticLaminationQualitySteel,SemiprocessedTypes1ThisstandardisissuedunderthefixeddesignationA726;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoverscold-rolledcarbonsheetsteelusedformagneticapplications.Theseproducts,commonlycalled“cold-rolledmagneticlaminationsteel”(CRML)areusuallyintendedforapplicationsinwhichthestampedlami-nationsorassembledcorestructuresforelectricalequipmentareannealedtodevelopthedesiredcorelossandpermeabilitycharacteristics.1.2Byusingappropriatelaminationannealingpractices,theusercanoptimizemagneticpropertiesforthevarioustypes.1.3Non-guaranteedcore-losstypes,usuallymadetocon-trolledchemicalcompositions,areavailablebutarenotcov-eredbythisspecification.1.4Higherqualitycore-losstypesaremadetocontrolledchemicalcompositionsandareusuallygivenacriticalreduc-tiononatemper-milltoyieldspecifiedmagneticpropertiesafterasuitablelaminationanneal.Theseproducts,typicallycalledsemiprocessedlaminationsteel,areclassifiedbytheASTMCodeLetterDinaccordancewithPracticeA664.1.5Thevaluesstatedincustomary(cgs-emuandinch-pound)unitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitswhichareprovidedforinformationonlyandarenotconsideredstandard.2.ReferencedDocuments2.1ASTMStandards:2A340TerminologyofSymbolsandDefinitionsRelatingtoMagneticTestingA343/A343MTestMethodforAlternating-CurrentMag-neticPropertiesofMaterialsatPowerFrequenciesUsingWattmeter-Ammeter-VoltmeterMethodand25-cmEp-steinTestFrameA370TestMethodsandDefinitionsforMechanicalTestingofSteelProductsA664PracticeforIdentificationofStandardElectricalSteelGradesinASTMSpecificationsA700GuideforPackaging,Marking,andLoadingMethodsforSteelProductsforShipmentE18TestMethodsfor...
