1、Designation:B394091Standard Specification forNiobium and Niobium Alloy Seamless and Welded Tubes1This standard is issued under the fixed designation B394;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A num
2、ber 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 wrought niobium and niobiumalloy seamless and welded
3、 tubes 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.1.2 The values stated in inch-pound
4、 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 of this specification.This standard doesn
5、ot 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:2B39
6、1 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 Defin
7、itions 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.4.Ordering Information4.1 Orders for materials
8、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 Welding(Section 5),4.1.4 Quantity in weight,number of pieces,and dimensions,4.1.5 Chemistry(6.3),4.1.6 Temper designation(Section 8),4.1.7 Pe
9、rmissible variations in length and quantity or weight(9.2,9.4,and Table 1B),4.1.8 Quality and finish(10.4),4.1.9 Sampling(11.2),4.1.10 Hydrostatic or pneumatic test(14.2),4.1.11 Inspection(Section 15),4.1.12 Required reports(Section 17),and4.1.13 Additions to the specification and supplementaryrequi
10、rements,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.5.2 Seamless tubes may be ma
11、de by any seamless methodthat will yield a product meeting the requirements of thisspecification,such as,but not limited to,extrusion of billetswith subsequent cold working by drawing,swaging,orpilgering,with intermediate anneals,until the final dimensionsare reached.5.3 Welded tubing shall be made
12、from flat-rolled productsby an automatic or semiautomatic welding process with noaddition of filler metal in the welding operation.Other methodsof welding,such as the addition of filler metal or hand welding,1This specification is under the jurisdiction of ASTM Committee B10 onReactive and Refractor
13、y 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 1989.Last previous edition approved in 2003 as B394-03.DOI:10.1520/B0394-09E01.2For referenced ASTM standards,visit the
14、 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 Stat
15、es1 may be employed if approved by the purchaser and tested bymethods agreed upon between the manufacturer and thepurchaser.The manufacturer must use proper precautions toprevent contamination during welding.6.Chemical Requirements6.1 The niobium and niobium alloy ingots and billets forconversion to
16、 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 interstitials as specified in 6.3.Alternately,an analysis of a representative sample of in processor final product from the same ingot may be substituted.6.3 When requested by the purchaser at the time ofpurchase,the manufacturer shal
