Designation:B768−11(Reapproved2016)StandardSpecificationforCopper-Cobalt-BerylliumAlloyandCopper-Nickel-BerylliumAlloyStripandSheet1ThisstandardisissuedunderthefixeddesignationB768;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationestablishestherequirementsforcopper-cobalt-berylliumandcopper-nickel-berylliumstripandsheetofthefollowingalloys:NominalComposition,%CopperAlloyUNSNo.2BerylliumCobaltNickelC174100.30.5...C174500.3...0.8C174600.3...1.21.2Units—Valuesstatedininch-poundunitsaretoberegardedasthestandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunits,whichareprovidedforinformationonlyandarenotconsideredstandard.1.3Thefollowingsafetyhazardcaveatpertainsonlytothetestmethodsdescribedinthisspecification:1.3.1Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1Thefollowingdocumentsoftheissueineffectondateofmaterialpurchaseformapartofthisspecificationtotheextentreferencedherein:2.2ASTMStandards:3B194SpecificationforCopper-BerylliumAlloyPlate,Sheet,Strip,andRolledBarB248SpecificationforGeneralRequirementsforWroughtCopperandCopper-AlloyPlate,Sheet,Strip,andRolledBarB601ClassificationforTemperDesignationsforCopperandCopperAlloys—WroughtandCastB846TerminologyforCopperandCopperAlloysE8/E8MTestMethodsforTensionTestingofMetallicMa-terialsE18TestMethodsforRockwellHardnessofMetallicMa-terialsE255PracticeforSamplingCopperandCopperAlloysfortheDeterminationofChemicalCompositionE527PracticeforNumberingMetalsandAlloysintheUnifiedNumberingSystem(UNS)3.T...
