Designation:B776−12StandardSpecificationforHafniumandHafniumAlloyStrip,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;thereforeeachsystemmustbeusedindependentlyoftheother.SIvaluescannotbemixedwithinch-poundvalues.1.3Thefollowingprecautionarycaveatpertainsonlytothetestmethodportionsofthisspecification.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E8TestMethodsforTensionTestingofMetallicMaterialsE21TestMethodsforElevatedTemperatureTensionTestsofMetallicMaterialsE29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecifications3.Terminology3.1LotDefinition:3.1.1lot,n—alotshallconsistofamaterialofthesamesize,shape,condition,andfinishproducedfromthesameingotbythesamereductionscheduleandthesameheattreatmentparameters.Unlessotherwiseagreeduponbetweenmanufac-turerandpurchaser,alotshallbelimitedtotheproductofan8hperiodforfinalcontinuousanneal,ortoasinglefurnaceloadforfinalbatchanneal.3.2Forms:3.2.1strip,n—aflatproduct,maybesuppliedincoil,lessthan6in.(150mm)inwidthandfrom0.005to0.188in.(0.13to4.8mm)inthickness.3.2.2sheet,n—aflatproduct6in.(150mm)ormoreinwidthandfrom0.005to0.188in.(0.13to4.8m...
