ASTM_B_884_-_11.pdf

Designation:B88411Standard Specification forNiobium-Titanium Alloy Billets,Bar,and Rod forSuperconducting Applications1This standard is issued under the fixed designation B884;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.1.Scope1.1 This specification covers niobium-titanium alloy billets,bars,and rods,at 46 to 48%titanium.This material is used inthe manufacture of wire for superconducting applications.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 The following precautionary caveat pertains only to thetest methods portion,Section 14,of this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2.Referenced Documents2.1 ASTM Standards:2E29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE92 Test Method for Vickers Hardness of Metallic Materials(Withdrawn 2010)3E112 Test Methods for Determining Average Grain SizeE165 Practice for Liquid Penetrant Examination for GeneralIndustryE214 Practice for Immersed Ultrasonic Testing by the Re-flection Method Using Pulsed Longitudinal Waves(With-drawn 2007)3E384 Test Method for Knoop and Vickers Hardness ofMaterialsE2626 Guide for Spectrometric Analysis of Reactive andRefractory Metals2.2 ANSI Standard:ANSI B46-1 Surface Texture42.3 ASNT Standard:ASNT SNT-TC-1A Personnel Qualification and Certifica-tion in Nondestructive Testing53.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 rod,nmaterial greater than 0.5 in.(13 mm)and lessthan 2.5 in(60 mm)in.diameter.3.1.2 bar,nmaterial greater than or equal to 2.5 in(60mm)and less than 6 in.(150 mm)in diameter.3.1.3 billet,nmaterial greater than or equal to 6 in.(150mm)in diameter.3.1.4 lot,na lot shall consist of material of the same size,shape,condition and finish produced from the same ingot orpowder blend by the same reduction schedule and the sameheat treatment parameters.Unless otherwise agreed betweenmanufacturer and purchaser,a lot shall be limited to theproduct of an 8th period for final continuous anneal,or to asingle furnace load for final batch anneal.4.Ordering Information4.1 Purchase orders for material under this specificationshould include:4.1.1 ASTM designation and year of issue,4.1.2 Quantity in weight,number of pieces,and dimensions,4.1.3 Grain size limit for diameters greater than 7.75 in.(see7.2 and Table 1),4.1.4 Surface texture,if required(see 10.3),4.1.5 Annealing condition,if different from 7.1,4.1.6 Permissible variations in diameter and length(see 9.1and 9.2),4.1.7 Sampling and analytical methods,if required(see11.3),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 April 1,2011.Published April 2011.Originallyapproved in 1997.Last previous edition approved in 2005 as B884-05.DOI:10.1520/B0884-11.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.5Available fromAmerican Society for Nondestructive Testing(ASNT),P.O.Box28518,1711 Arlingate Ln.,Columbus,OH 43228-0518,http:/www.asnt.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.1.8 Inspection requirements(see Section 15),4.1.9 Certification and report needs(see Section 17),and4.1.10 Additions to the specification and supplementaryrequirements,as required.5.Materials and Manufacture5.1 Materials covered by this specification shall be madefrom ingots which are produced by vacuum,plasma-arc orelectron beam furnace melting,or a combination of thesemethods.All melting is to be carried out in furnaces usuallyused for reactive metals.5.2 The products covered by this specification are formedwith conventional forging,swaging,rolling,extruding,anddrawing equipment normally available in metal workingplants.6.Chemical Composition6.1 The Nb-Ti alloy ingots,billets,and rods covered by thisspecification shall conform to the chemical composition limitsshown