Designation:B643−12(Reapproved2016)StandardSpecificationforCopper-BerylliumAlloySeamlessTube1ThisstandardisissuedunderthefixeddesignationB643;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationestablishesrequirementsforcopper-berylliumalloyseamlesstubeinstraightlengths.CopperAlloyUNSC17200willbethealloyfurnishedwheneverSpecifica-tionB643isspecified.1.2Units—Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thefollowingsafetyhazardcaveatpertainsonlytothetestmethodsdescribedinthisspecification.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1Thefollowingdocumentsoftheissueineffectondateofmaterialpurchaseformapartofthisspecificationtotheextentreferencedherein:2.2ASTMStandards:2B194SpecificationforCopper-BerylliumAlloyPlate,Sheet,Strip,andRolledBarB251SpecificationforGeneralRequirementsforWroughtSeamlessCopperandCopper-AlloyTubeB601ClassificationforTemperDesignationsforCopperandCopperAlloys—WroughtandCastB846TerminologyforCopperandCopperAlloysE3GuideforPreparationofMetallographicSpecimensE8/E8MTestMethodsforTensionTestingofMetallicMa-terialsE18TestMethodsforRockwellHardnessofMetallicMa-terialsE29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecificationsE112TestMethodsforDeterminingAverageGrainSizeE255PracticeforSamplingCopperandCopperAlloysfortheDeterminationofChemicalCompositionE527PracticeforN...
