Designation:A860/A860M−18StandardSpecificationforWroughtHigh-StrengthFerriticSteelButt-WeldingFittings1ThisstandardisissuedunderthefixeddesignationA860/A860M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationcoverswroughthigh-strengthferriticsteelbutt-weldingfittingsofseamlessandelectricfusion-weldedconstruction.DimensionsofthefittingsareprovidedinthelatestrevisionsofASMEB16.9andMSS-SP-75.Butt-weldingfittingsdifferingfromASMEB16.9shallbefurnishedinaccordancewithSupplementaryRequirementS58ofSpeci-ficationA960/A960M.Thesefittingsareforuseinhigh-pressuregasandoiltransmissionanddistributionsystems.1.2Optionalsupplementaryrequirementsareprovidedforfittingswhenagreaterdegreeofexaminationisdesired.Oneormoreofthesupplementaryrequirementsmaybespecifiedintheorder.1.3Thisspecificationdoesnotcovercast-weldingfittingsorfittingsmachinedfromcastings.1.4ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.Unlesstheorderspecifiestheapplicable“M”speci-ficationdesignation(SIunits),thematerialshallbefurnishedtoinch-poundunits.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2A751TestMethods,Practices,andTerminologyforChemi-calAnalysisofSteelProductsA960/A960MSpecificationforCommonRequirementsforWroughtSteelPipingFittings2.2ASMEStan...
