Designation:B674−05(Reapproved2016)StandardSpecificationforUNSN08925,UNSN08354,andUNSN08926WeldedTube1ThisstandardisissuedunderthefixeddesignationB674;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThisspecificationcoversUNSN08925,2UNSN08354,andUNSN08926weldedtubeforgeneralcorrosionapplica-tions.1.2Thisspecificationcoversoutsidediameterandnominalwalltube.1.2.1Thetubesizescoveredbythisspecificationare1⁄8to5in.(3.2to127mm)inoutsidediameterand0.015to0.320in.(0.38to8.13mm),inclusive,inwallthickness.1.3ASTMInternationalhasadopteddefinitionswherebysomegrades,suchasUNSN08904,previouslyinthisspeci-ficationwererecognizedasstainlesssteels,becausethosegradeshaveironasthelargestelementbymasspercent.SuchgradesareundertheoversightofASTMCommitteeA01anditssubcommittees.TheproductsofN08904previouslycoveredinthisspecificationarenowcoveredbySpecificationA249/A249M.1.4Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.ItistheresponsibilityoftheuserofthisstandardtobecomefamiliarwithallhazardsincludingthoseidentifiedintheappropriateSafetyDataSheet(SDS)forthisproduct/materialasprovidedbythemanufacturer,toestablishappropriatesafetyandhealthpractices,anddeterminetheapplicabilityofregulatorylimi-tationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3A249/A249MSpecificationforWeldedAusteniticSteelBoiler,Superheater,Heat-Exchanger,andCondenserTubesB751SpecificationforGeneralRequirementsforNickelandNickelAlloyWeldedTubeE527PracticeforNumberingMetalsandAlloysintheUnifiedNumberingSystem(UNS)3.OrderingInformation3.1Ordersformaterialtothisspecificationshouldincl...
