ASTM_B_521_-_12.pdf

Designation:B52112Standard Specification forTantalum and Tantalum Alloy Seamless and Welded Tubes1This standard is issued under the fixed designation B521;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 tantalum and tantalum alloyseamless and welded tubes of the following grades:1.1.1 UNS Grade R05400Unalloyed tantalum,powder-metallurgy consolidation,1.1.2 UNS Grade R05200Unalloyed tantalum,vacuummelted,1.1.3 UNS Grade R05252Tantalum+2.5%tungstenalloy,vacuum melted.1.1.4 UNS Grade R05255Tantalum+10%tungstenalloy,vacuum melted.1.1.5 UNS Grade R05240Tantalum alloy,60%tantalum,40%niobium,electron-beam furnace or vacuum arc melt,orboth.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.2.Referenced Documents2.1 ASTM Standards:2E29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 lotall material produced from the same ingot orsingle powder blend,of the same size and last annealed in thesame furnace charge.3.1.2 process lengththe one-piece length of each tube thatresults from the production operation that first yields thetubular form.Sampling and testing should in general be basedon process lengths unless specifically stated otherwise.4.Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity,4.1.2 UNS grade,4.1.3 Type(welded or seamless),4.1.4 Dimensions,4.1.5 Nondestructive test requirements,if any,and4.1.6 Additions to the specification and supplementaryrequirements,if any.5.Materials and Manufacture5.1 Seamless tube shall be made by any seamless methodthat will yield a product meeting the requirements of thisspecification.5.2 Welded tube shall be made from flat-rolled product byan automatic or semiautomatic fusion welding process with noaddition of filler metal.6.Chemical Composition6.1 The material shall conform to the requirements ofchemical composition prescribed in Table 1.6.1.1 Analysis for elements not listed in Table 1 and notnormally expected in tantalum shall not be required unlessspecified at time of purchase.6.2 The manufacturers ingot analysis shall be consideredthe chemical analysis for products supplied under this specifi-cation.6.3 When requested by the purchaser at the time of purchasethe manufacturer shall report the values of the interstitialelements carbon,oxygen,hydrogen,and nitrogen as specifiedin Table 1 for each lot of finished product.7.Mechanical Properties7.1 TensileThe tensile properties of the finished tubematerial shall conform to the requirements of Table 2.7.2 FlareAsection of the finished tube shall be capable ofbeing flared without cracking visibly to the unaided eye.Theflare shall be made with a tool having a 60 included angle untilthe outside diameter has been increased 20%.7.3 Reverse FlatteningAsection of welded tube that is slitlongitudinally 90 either side of the weld shall be opened and1This specification is under the jurisdiction of ASTM Committee B10 onReactive and Refractory Metals and Alloysand is the direct responsibility ofSubcommittee B10.03 on Niobium and Tantalum.Current edition approved Dec.1,2012.Published January 2013.Originallyapproved in 1970.Last previous edition approved in 2004 as B521 98(2004).DOI:10.1520/B0521-12.2For 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 flattened with the weld at the point of maximum bend.Nocracking is permitted.7.4 One set of these mechanical tests shall be made on eachlot of tubes and for each fifty process length tubes of each lotor fraction thereof.8.Nondestructive Test Requirements8.1 Hydrostatic TestIf specified in the purchase order,each tube so tested shall withstand without showing bulges,leaks,or other defects,an internal hydrostatic pressure that willproduce in the tube wall a stress of 75%of the minimumspecified yield strength at room temperature.This pressureshall be determined by the equation:P 5 2 St/D(1)where:P=minimum hydrostatic pressure,psi(or MPa),S=allowable fiber stress of 75%of the minimum yieldstrength,psi(or MPa),t=average wall thickness of the tube,in.(or mm),andD=outside diameter of the tube in.(or mm).Maintain the test pressure for a minimum of 10 s.8.2 Pneumatic TestIf specified in the purchase