ASTM_B_393_-_09e1.pdf

Designation:B393091Standard Specification forNiobium and Niobium Alloy Strip,Sheet,and Plate1This standard is issued under the fixed designation B393;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEEditorial corrections were made throughout in January 2010.1.Scope1.1 This specification covers five grades of wrought nio-bium and niobium alloy strip,sheet,and plate as follows:1.1.1 R04200-Type 1Reactor grade unalloyed niobium,1.1.2 R04210-Type2Commercialgradeunalloyedniobium,1.1.3 R04251-Type 3Reactor grade niobium alloy contain-ing 1%zirconium,and1.1.4 R04261-Type 4Commercial grade niobium alloycontaining 1%zirconium.1.1.5 R04220-Type 5RRR grade pure niobium.NOTE1This grade of niobium is used in superconducting applicationsthat require the ultra high purity.Because of the high purity the product isconducive to very large grains that can adversely affect formability.It isnot recommended for other applications.1.2 Except for dimensional tolerances in Table 1,the valuesstated in inch-pound units are to be regarded as standard.Thevalues given in parentheses are mathematical conversions to SIunits that are provided for information only and are notconsidered standard.1.3 The following precautionary caveat pertains only to thetest methods portion of this specification.This standard doesnot purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the user of thisstandard to establish appropriate safety and health practicesand determine the applicability of regulatory limitations priorto use.2.Referenced Documents2.1 ASTM Standards:2B391 Specification for Niobium and Niobium Alloy IngotsE8 Test Methods for Tension Testing of Metallic MaterialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE2626 Guide for Spectrometric Analysis of Reactive andRefractory Metals3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 lot,na lot shall consist of all material produced fromthe same ingot at one time,with the same cross section,processed with the same nominal metallurgical parameters andheat treated at the same conditions.3.1.2 plate,na flat product 6 in.(152.4 mm)or more inwidth and greater than316in.(4.76 mm)in thickness.3.1.3 sheet,na flat product 6 in.(152.4 mm)or more inwidth and from 0.005 in.(0.13 mm)to316in.(4.76 mm)inthickness.3.1.4 strip,na flat product,which may be supplied in coil,less than 6 in.(152.4 mm)in width and from 0.005 in.(0.13mm)to316in.(4.76 mm)in thickness.4.Ordering Information4.1 Orders for materials under this specification shall in-clude the following information as applicable:4.1.1 Type and grade(Section 1),4.1.2 ASTM designation and year of issue,4.1.3 Quantity in weight,number of pieces,and dimensions,4.1.4 Chemistry(6.3),4.1.5 Temper designation(Section 8),4.1.6 Permissible overshipment(9.3),4.1.7 Quality and finish(10.3),4.1.8 Sampling(11.2),4.1.9 Inspection(Section 15),4.1.10 Required reports(Section 17),4.1.11 Marking(Section 18),and4.1.12 Additions to the specification and supplementaryrequirements,as required.5.Materials and Manufacture5.1 Material covered by this specification shall be madefrom ingots that conform to Specification B391 and that areproduced by vacuum or plasma arc melting,vacuum electron-beam melting,or a combination of these three methods.1This specification is under the jurisdiction of ASTM Committee B10 onReactive and Refractory Metals and Alloys and is the direct responsibility ofSubcommittee B10.03 on Niobium and Tantalum.Current edition approved Oct.1,2009.Published December 2009.Originallyapproved in 1999.Last previous edition approved in 2005 as B393 05.DOI:10.1520/B0393-09E01.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 The various niobium mill products covered by thisspecification are formed with the conventional extrusion,forging,swaging,rolling,and drawing equipment normallyavailable in metal working plants.6.Chemical Requirements6.1 The niobium and niobium alloy ingots and billets forconversion to finished products covered by this specificationshall conform to the requirements for chemical composition asprescribed in Table 2.6.2 The manufacturers ingot analysis shall be consideredthe chemical analysis for products supplied under thisspecification,except for end product interstitials as specified in6.3.Alternately,an analysis of a representative sample of inprocess or final product from the same ingot may