Designation:B776−12(Reapproved2019)StandardSpecificationforHafniumandHafniumAlloyStrip,Sheet,andPlate1ThisstandardisissuedunderthefixeddesignationB776;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoverstwogradesofwroughthaf-niumandhafniumalloystrip,sheet,andplateasfollows:1.1.1GradeR1fornuclearapplications,and1.1.2GradeR3forcommercialapplications.1.2Unlessasingleunitisused,forexamplecorrosionmassgaininmg/dm2,thevaluesstatedineitherinch-poundorSIunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheother.SIvaluescannotbemixedwithinch-poundvalues.1.3Thefollowingprecautionarycaveatpertainsonlytothetestmethodportionsofthisspecification.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafety,health,andenviron-mentalpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2E8/E8MTestMethodsforTensionTestingofMetallicMa-terialsE21TestMethodsforElevatedTemperatureTensionTestsofMetallicMaterialsE29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecifications3.Terminology3.1LotDefinition:3.1.1lot,n—alotshallconsistofamaterialofthesamesize,shape,condition,andfinishproducedfromthesameingotbythesamereductionscheduleandthesameheattreatmentparameters.Unlessotherwiseagreeduponbetweenmanufac-turerandpurchase...
