1、Designation: B521 98 (Reapproved 2004)B521 12Standard 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,
2、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 alloy seamless and welded tubes of the following grades:1.
3、1.1 UNS Grade R05400Unalloyed tantalum, powder-metallurgy consolidation,1.1.2 UNS Grade R05200Unalloyed tantalum, vacuum melted,1.1.3 UNS Grade R05252Tantalum + 2.5 % tungsten alloy, vacuum melted.1.1.4 UNS Grade R05255Tantalum + 10 % tungsten alloy, vacuum melted.1.1.5 UNS Grade R05240Tantalum allo
4、y, 60 % tantalum, 40 % columbium,niobium, electron-beam furnace or vacuum arcmelt, or both.1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for informationonly.mathematical conversions to SI units that are provided for information only
5、 and are not considered standard.2. Referenced Documents2.1 ASTM Standards:2E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 lotall material produced from the same ingot or single
6、 powder blend, of the same size and last annealed in the samefurnace charge.3.1.2 process lengththe one-piece length of each tube that results from the production operation that first yields the tubularform. Sampling and testing should in general be based on process lengths unless specifically state
7、d otherwise.4. Ordering Information4.1 Orders for material under this specification shall include the 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 supp
8、lementary requirements, if any.5. Materials and Manufacture5.1 Seamless tube shall be made by any seamless method that will yield a product meeting the requirements of this specification.5.2 Welded tube shall be made from flat-rolled product by an automatic or semiautomatic fusion welding process wi
9、th noaddition of filler metal.1 This specification is under the jurisdiction of ASTM Committee B10 on Reactive and Refractory Metals and Alloysand is the direct responsibility of SubcommitteeB10.03 on Niobium and Tantalum.Current edition approved May 1, 2004Dec. 1, 2012. Published May 2004January 20
10、13. Originally approved in 1970. Last previous edition approved in 19982004 asB521 98.B521 98 (2004). DOI: 10.1520/B0521-98R04.10.1520/B0521-12.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvo
11、lume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to ade
12、quately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshoho
13、cken, PA 19428-2959. United States16. Chemical Composition6.1 The material shall conform to the requirements of chemical composition prescribed in Table 1.6.1.1 Analysis for elements not listed in Table 1 and not normally expected in tantalum shall not be required unless specifiedat time of purchase
14、.6.2 The manufacturers ingot analysis shall be considered the chemical analysis for products supplied under this specification.6.3 When requested by the purchaser at the time of purchase the manufacturer shall report the values of the interstitial elementscarbon, oxygen, hydrogen, and nitrogen as sp
15、ecified in Table 21 for each lot of finished product.7. Mechanical Properties7.1 TensileThe tensile properties of the finished tube material shall conform to the requirements of Table 32.7.2 FlareA section of the finished tube shall be capable of being flared without cracking visibly to the unaided
16、eye. The flareshall be made with a tool having a 60 included angle until the outside diameter has been increased 20 %.7.3 Reverse FlatteningA section of welded tube that is slit longitudinally 90 either side of the weld shall be opened andflattened with the weld at the point of maximum bend. No crac
17、king is permitted.7.4 One set of these mechanical tests shall be made on each lot of tubes and for each fifty process length tubes of each lot orfraction thereof.8. Nondestructive Test Requirements8.1 Hydrostatic TestIf specified in the purchase order, each tube so tested shall withstand without sho
18、wing bulges, leaks, orother defects, an internal hydrostatic pressure that will produce in the tube wall a stress of 75 % of the minimum specified yieldstrength at room temperature. This pressure shall be determined by the equation:P 52St/D (1)where:P = minimum hydrostatic pressure, psi (or MPa),S =
19、 allowable fiber stress of 75 % of the minimum yield strength, 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 order, each tube so tested
20、shall withstand an internal air pressure of 100 psi(0.7 MPa), minimum for 5 s, minimum without showing evidence of leakage. The test method used shall permit easy visualdetection of any leakage such as by placing the tube under water or by using the pressure differential method. Any evidence ofthe l
21、eakage shall be cause of rejection of that tube.8.3 Helium Leak TestIf specified in the purchase order, each tube shall be tested by evacuating to an internal pressure of10 106 torr (1.3 MPa) or less and tested for leakage by spraying helium along the length of the outside surface. Detection ofa lea
22、k at a rate greater than 10 107 standard cm3/s shall be cause of rejection of that tube.8.4 Ultrasonic TestIf specified on the purchase order, each length of tube shall be tested ultrasonically. The test procedure andcalibration standards shall be agreed upon between the manufacturer and purchaser.
23、Any tube showing an indication in excess ofthat obtained from the calibration standard shall be set aside and be subject to rework, retest, or rejection. A tube thus set asidemay be further examined by other methods for confirmation of the presence of a defect with or without rework; such a tube may
24、be determined acceptable if no other evidence for a defect is found. (Rework by weld repair is not permitted.)TABLE 1 Ingot Chemical RequirementsElement (Composition, max weight %)R05200 R05400 R05252 R05255 R05240O 0.015 0.030 0.015 0.015 0.020N 0.010 0.010 0.010 0.010 0.010C 0.010 0.010 0.010 0.01
25、0 0.010H 0.0015 0.0015 0.0015 0.0015 0.0015Nb 0.10 0.10 0.50 0.10 35.042.0Mo 0.020 0.020 0.020 0.020 0.020W 0.050 0.050 2.03.5 9.011.0 0.050Ti 0.010 0.010 0.010 0.010 0.010Si 0.005 0.005 0.005 0.005 0.005Fe 0.010 0.010 0.010 0.010 0.010Ni 0.010 0.010 0.010 0.010 0.010Ta remainder remainder remainder
26、 remainder remainderB521 1229. Permissible Variations9.1 Diameter and Wall ThicknessThe permissible variations in diameter and wall thickness of tubes specified in the purchaseorder shall not exceed those prescribed in Table 3.9.2 LengthWhen tubing is ordered cut to length, the usable length shall b
27、e not less than that specified; but a variation of +18in. (3.2 mm) will be permitted for lengths up to 6 ft (1.8 m). In lengths over 6 ft, a variation of +14 in. (6.4 mm) will be permitted,unless otherwise specified.9.3 StraightnessThe tube shall be free of bends or kinks and the maximum uniform bow
28、 shall not exceed values shown inTable 4.9.4 Squareness of CutThe angle of cut of the end of any tube may depart from square by not more than 0.016 in./in. (mm/mm)of diameter.10. Workmanship, Finish, and Appearance10.1 The finished tube shall be clean and free of foreign material, shall have smooth
29、ends, free of burrs, and shall be free ofinjurious external and internal imperfections in accordance with standards of acceptability agreed upon between the manufacturerand the purchaser. Minor defects may be removed provided the dimensional tolerance of Section 9, are not exceeded.11. Retest11.1 If
30、 any sample or specimen exhibits obvious surface contamination or improper preparation disqualifying it as a trulyrepresentative sample, discard it and substitute a new sample or specimen.11.2 In case of failure, retest two additional specimens. If both specimens conform to this specification, disca
31、rd the originalvalues and consider the material acceptable.11.3 If the inspection results of a lot are not in conformance with the requirements of this specification, the lot may be reworkedat the option of the manufacturer. A lot shall be acceptable if results of all tests after reworking conform t
32、o the specification.12. Significance of Numerical Limits12.1 For the purpose of determining compliance with the specified limits of property requirements, an observed value or acalculated value shall be rounded in accordance with the rounding method of Practice E29.13. Inspection13.1 The manufacture
33、r shall inspect the material covered by the specification prior to shipment.TABLE 2 Mechanical RequirementsR05200/R05400 R05252 R05255 R05240Ultimate tensile strength, min, psi (MPa) 30 000 (207) 40 000 (276) 70 000 (481) 40 000 (226)Yield strength, 0.2 % offset, min, psi (MPa) 20 000 (138) 28 000 (
34、193) 60 000 (414) 28 000 (193)Elongation, min %, in 1 or 2 in. (25 or 51 mm) 25 20 15 20TABLE 3 Permissible Variations in Outside Dimensions Based onIndividual MeasurementsOutside Diameter,in. (mm)DiameterTolerance,A,BPlus or Minus,in. (mm)PermissibleVariationsCin WallThickness, %Under 1 (25.4), exc
35、l 0.004 (0.102) 101 to 112 (25.4 to 38.1), excl 0.005 (0.127) 10112 to 2 (38.1 to 50.8), excl 0.006 (0.152) 102 to 212 (50.8 to 63.5), excl 0.007 (0.178) 10212 to 312 (63.5 to 88.9), excl 0.010 (0.254) 10A These permissible variations in outside diameter apply only to tubes as finishedat the mill be
36、fore subsequent swaging, expanding, bending, polishing, or otherfabricating operation.B Ovality is the maximum and minimum outside diameter of a tube measured atany one cross section. If the measurement is made with a ring gage the followingformula shall apply: Ovality = specified OD tube + diameter
37、 tolerance + 0.002 in.(length of ring gage, 1 in.) nominal diameter.C When minimum wall tubes are ordered, tolerances are all plus and shall bedouble the values shown.B521 12313.2 If so specified on the purchase order, the purchaser or his representative may witness the testing and inspection of the
38、material at the place of manufacture. In such cases, the purchaser shall state in his purchase order which tests he desires to witness.The manufacturer shall give ample notice to the purchaser as to the time and place of the designated test. If the purchasersrepresentative does not present himself a
39、t the agreed-upon time for the testing, and if no new date is agreed upon, the manufacturershall consider the requirements for purchasers inspection at the place of manufacturer to be waived. When the inspectorrepresenting the purchaser does appear at the appointed time and place, the manufacturer s
40、hall afford him all reasonable facilitiesto see that the material is being furnished in accordance with this specification. This inspection shall be conducted so as not tointerfere unnecessarily with production operations.14. Rejection and Rehearing14.1 Material that fails to conform to the requirem
41、ents of this specification may be rejected. Rejection shall be reported to theproducer or supplier promptly and in writing. In case of dissatisfaction with the results of the test, the producer or supplier maymake claim for a rehearing.15. Referee15.1 In the event of disagreement between the manufac
42、turer and the purchaser of the conformance of the material to therequirements of this specification or any special test specified by the purchaser, a mutually acceptable referee shall perform the testsin question. The results of the referees testing shall be used in determining conformance of the ma
43、terial to this specification.16. Certification16.1 When specified in the purchase order or contract, a producers or suppliers certification shall be furnished to the purchaserThe producer or supplier shall furnish the purchaser with a certificate that the material was manufactured, sampled, tested,
44、andinspected in accordance with this specification and has been found to meet the requirements. When The certificate shall report theresults of all tests required by the specification including additional optional tests specified in the purchase order or contract, areport of the test results shall b
45、e furnished.standard when requested by the purchaser at the time of purchase.17. Packaging and Package Marking17.1 Each bundle, box, or carton shall be marked or tagged legibly and conspicuously with the number of this specification,purchase order number, nominal size, and the gross, net, and tare w
46、eights.17.2 All material shall be packed in such a manner as to assure safe delivery to its destination when properly transported byany common carrier.18. Keywords18.1 seamless tubing; tantalum; tantalum alloy; tantalum tubes; welded tubingASTM International takes no position respecting the validity
47、 of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject
48、to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters.
49、 Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress
