Designation:A424/A424M−09a(Reapproved2016)StandardSpecificationforSteel,Sheet,forPorcelainEnameling1ThisstandardisissuedunderthefixeddesignationA424/A424M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationcoverssheetsteelincoilsandcutlengthsforporcelainenameling.Thecompositionsandpro-cessingofthesesteelsaresuchthatarticlesforporcelainenamelingmaybefabricatedfromthemand,underproperconditions,enameled.ThesteelsarefurnishedasTypeI,TypeII,andTypeIII.TypeIandTypeIIaresuppliedintwodesignations,CommercialSteelandDrawingSteel.TypeIIIsteelisinterstitial-freeanddoesnotrequireadesignation.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3TolerancesarefoundinGeneralRequirementsSpecifi-cationsA568/A568MandA635/A635M.TheappropriateGen-eralRequirementsspecificationisappliedbasedonthethick-nessandwidthoftheproductordered.2.ReferencedDocuments2.1ASTMStandards:2A568/A568MSpecificationforSteel,Sheet,Carbon,Structural,andHigh-Strength,Low-Alloy,Hot-RolledandCold-Rolled,GeneralRequirementsforA635/A635MSpecificationforSteel,SheetandStrip,Heavy-ThicknessCoils,Hot-Rolled,Alloy,Carbon,Structural,High-StrengthLow-Alloy,andHigh-StrengthLow-AlloywithImprovedFormability,GeneralRequire-mentsforA941TerminologyRelatingtoSteel,StainlessSteel,RelatedAlloys,andFerroalloys3.Terminology3.1Definitions—Fordefinitionsofothertermsusedinthisspecification,refertoTerminologyA941.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1basecoat—alsoknownasgroundcoat.Thiscoatinglayerisapplieddire...
