Designation:B391−09´1StandardSpecificationforNiobiumandNiobiumAlloyIngots1ThisstandardisissuedunderthefixeddesignationB391;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.´1NOTE—EditorialcorrectionsweremadethroughoutinJanuary2010.1.Scope1.1Thisspecificationcoversunalloyedandalloyedniobiumingotspreparedbyvacuum-orplasma-arcmeltingorelectron-beammeltingtoproduceconsolidatedmetalforprocessingtovariousmillshapes.1.2Thematerialscoveredbythisspecificationare:1.2.1R04200-Type1—Reactorgradeunalloyedniobium,1.2.2R04210-Type2—Commercialgradeunalloyedniobium,1.2.3R04251-Type3—Reactorgradeniobiumalloycontain-ing1%zirconium,and1.2.4R04261-Type4—Commercialgradeniobiumalloycontaining1%zirconium.1.3Unlessasingleunitisused,thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.4Thefollowingprecautionarycaveatpertainsonlytothetestmethodportionsofthisspecification:Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecificationsE2626GuideforSpectrometricAnalysisofReactiveandRefractoryMetals3.OrderingInformation3.1Ordersformaterialunderthisspecificationshallincludethefollowinginformation,asapplicable:3.1.1ASTMstandardnumberandyearofissue,3.1.2Type(see1.2),3.1.3Quantityinweightorpieces,3.1.4Size,diameterandlength,3.1.5Chemistry(see5.2),3.1.6Permissibleovershipment(see6.1),3.1.7Qualityandfinish(see7.2and7.6),3.1.8Sampling(Section8)3.1.9Packaging(Section15...
