Designation:A928/A928M−14StandardSpecificationforFerritic/Austenitic(Duplex)StainlessSteelPipeElectricFusionWeldedwithAdditionofFillerMetal1ThisstandardisissuedunderthefixeddesignationA928/A928M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationcoverselectric-fusion-weldedsteelpipesuitableforcorrosiveservice.NOTE1—ThedimensionlessdesignatorNPS(nominalpipesize)hasbeensubstitutedinthisspecificationfortraditionaltermssuchasnominaldiameter,size,andnominalsize.1.2Thisspecificationcoversgradesofferritic/austeniticsteelasindicatedinTable1.Theselectionoftheproperalloyandrequirementsforheattreatmentshallbeatthediscretionofthepurchaser,dependentontheserviceconditionstobeencountered.1.3Fiveclassesofpipearecoveredasfollows:1.3.1Class1—Pipeshallbedoubleweldedbyprocessesusingfillermetalinallpassesandshallberadiographedcompletely.1.3.2Class2—Pipeshallbedoubleweldedbyprocessesusingfillermetalinallpasses.Noradiographisrequired.1.3.3Class3—Pipeshallbesingleweldedbyprocessesusingfillermetalinallpassesandshallberadiographedcompletely.1.3.4Class4—SameasClass3,exceptthattheweldpassexposedtotheinsidepipesurfaceispermittedtobemadewithouttheadditionoffillermetal(see6.2.2.1and6.2.2.2).1.3.5Class5—Pipeshallbedoubleweldedbyprocessesusingfillermetalinallpassesandshallbespotradiographed.1.4Supplementaryrequirementscoveringprovisionsrang-ingfromadditionaltestingtoformalizedproceduresformanufacturingpracticeareprovided.SupplementaryRequire-mentsS1throughS4areincludedasoptionstobespecifiedinthepurchaseorderwhendesired.1.5ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combinin...
