Designation:A789/A789M−17StandardSpecificationforSeamlessandWeldedFerritic/AusteniticStainlessSteelTubingforGeneralService1ThisstandardisissuedunderthefixeddesignationA789/A789M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecification2coversgradesofaveragewallthickness,or,ifspecifiedontheorder,minimumwallthickness,ofstainlesssteeltubingforservicesrequiringgeneralcorrosionresistance,withparticularemphasisonresistancetostresscorrosioncracking.Thesesteelsaresuscep-tibletoembrittlementifusedforprolongedperiodsatelevatedtemperatures.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.Withinthetext,theSIunitsareshowninbrackets.Theinch-poundunitsshallapplyunlesstheMdesignationofthisspecificationisspecifiedintheorder.2.ReferencedDocuments2.1ASTMStandards:3A480/A480MSpecificationforGeneralRequirementsforFlat-RolledStainlessandHeat-ResistingSteelPlate,Sheet,andStripA1016/A1016MSpecificationforGeneralRequirementsforFerriticAlloySteel,AusteniticAlloySteel,andStainlessSteelTubesE527PracticeforNumberingMetalsandAlloysintheUnifiedNumberingSystem(UNS)2.2SAEStandard:4SAEJ1086PracticeforNumberingMetalsandAlloys(UNS)3.OrderingInformation3.1Ordersforproductunderthisspecificationshouldin-cludethefollowing,asrequired,todescribethedesiredmaterialadequately:3.1.1Quantity(feet,metres,ornumberoflengths),3.1.2Nameofproduct(seamlessorweldedtubes),3.1.3Grade(seeTable1),3.1.4Size(outsidediameterandaveragewallthickness,unlessminimumwallthicknessisspecified),3.1.5Length(specificorrandom),3.1.6Optionalrequirements(forproductanalysis,seeSec-tion8;forhydrostati...
