Designation:B271/B271M−15StandardSpecificationforCopper-BaseAlloyCentrifugalCastings1ThisstandardisissuedunderthefixeddesignationB271/B271M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationestablishesrequirementsforcentrifu-galcastingsofcopper-basealloyshavingthenominalcompo-sitionsshowninTable1.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.2.ReferencedDocuments2.1ThefollowingdocumentsinthecurrentissueoftheBookofStandardsformapartofthisspecificationtotheextentreferencedherein:2.2ASTMStandards:2B208PracticeforPreparingTensionTestSpecimensforCopperAlloySand,PermanentMold,Centrifugal,andContinuousCastingsB824SpecificationforGeneralRequirementsforCopperAlloyCastingsB846TerminologyforCopperandCopperAlloysE10TestMethodforBrinellHardnessofMetallicMaterials2.3ASMECode:3BoilerandPressureVesselCode3.Terminology3.1DefinitionsoftermsrelatingtocopperalloyscanbefoundinTerminologyB846.4.OrderingInformation4.1Ordersforcentrifugalcastingsunderthisspecificationshouldincludethefollowinginformation:4.1.1Specificationtitle,number,andyearofissue,4.1.2Quantity(lengthornumber)ofcastings,4.1.3CopperAlloyUNSNumber(Table1)andtemper(as-cast,heat-treated,andsoforth),4.1.4Dimensionsordrawingnumberandcondition(as-cast,machined,andsoforth),4.1.5ASMEBoilerandPressureVesselCoderequirements(Section9),4.1.6WhencastingsarepurchasedforagenciesoftheU.S.Government,theSupplementaryRequirementsinSpecificationB824maybespecified.4.2Thefollowingareoptionalandshouldbespecifiedinthepurchas...
