Designation:A254/A254M−12StandardSpecificationforCopper-BrazedSteelTubing1ThisstandardisissuedunderthefixeddesignationA254/A254M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thisspecificationcoversdouble-wall,copper-brazedsteeltubingsuitableforgeneralengineeringuses,particularlyintheautomotive,refrigeration,andstoveindustriesforfuellines,brakelines,oillines,heatingandcoolingunits,andthelike.Thetubingisavailableineitheroftwotypes,singlestripordoublestripasshowninFig.1.1.2Units—Thisspecificationisexpressedinbothinch-poundsunitsandinSIunits;however,unlessthepurchaseorderorcontractspecifiestheapplicableMspecificationdesignation(SIunits),theinch-poundunitsshallapply.Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedinde-pendentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.Inthisspecificationhardorrationalizedconversionsapplytodiameters,lengths,andtensileproperties.SoftconversionappliestootherSImeasurements.2.ReferencedDocuments2.1ASTMStandards:2A370TestMethodsandDefinitionsforMechanicalTestingofSteelProductsA751TestMethods,Practices,andTerminologyforChemi-calAnalysisofSteelProductsE30TestMethodsforChemicalAnalysisofSteel,CastIron,Open-HearthIron,andWroughtIron(Withdrawn1995)3E59PracticeforSamplingSteelandIronforDeterminationofChemicalComposition(Withdrawn1996)32.2SocietyofAutomotiveEngineersStandard:4J533FlaresforTubing3.OrderingInformation3.1Ordersformaterialunderthisspecificationshouldincludethefollowing,asrequiredtodescribethedesiredmaterialadequately:3.1.1Quantity(feet,metresor...
