1、Designation: B708 05B708 12Standard Specification forTantalum and Tantalum Alloy Plate, Sheet, and Strip1This standard is issued under the fixed designation B708; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last rev
2、ision. 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 unalloyed and alloyed tantalum plate, sheet, and strip as follows.1.1.1 R05200, unalloyed tantalum,
3、electron-beam furnace or vacuum-arc melt, or both,1.1.2 R05400, unalloyed tantalum, powder-metallurgy consolidation,1.1.3 R05255, tantalum alloy, 90 % tantalum, 10 % tungsten, electron-beam furnace of vacuum-arc melt, or both,1.1.4 R05252, tantalum alloy, 97.5 % tantalum, 2.5 % tungsten, electron-be
4、am furnace or vacuum-arc melt, or both, and1.1.5 R05240, tantalum alloy, 60 % tantalum, 40 % nobium,niobium, electron-beam furnace or vacuum-arc melt.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 con
5、versions to SI units that are provided for information only and are not considered standard.1.3 This standard does not purport to address all of the safety and/or health problems, if any, associated with its use. It is theresponsibility of the user of this standard to establish appropriate safety an
6、d health practices and determine the applicability ofregulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E8 Test Methods for Tension Testing of Metallic MaterialsE29 Practice for Using Significant Digits in Test Data to Determine Conformance with SpecificationsE112 Test Me
7、thods for Determining Average Grain Size3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 annealed material, nplate, sheet, or strip that has been annealed.3.1.2 annealing (annealed), nthe act of heat treating to soften plate, sheet, or strip.3.1.3 lot, nall material produced fr
8、om the same ingot or a single powder blend at one time with the same cross section, andwith the same nominal metallurgical parameters.3.1.4 plate, na flat product more than 0.1853 in. (4.7 mm) in thickness.3.1.5 sheet, na flat product 6 in. (152.4 mm) or more in width and from 0.005 in. (0.13 mm) to
9、 0.1875 in. (4.76 mm) inthickness.3.1.6 strip, na flat product, may be supplied in coil, less than 6 in. (152.4 mm) in width and from 0.005 in. (0.13 mm) to0.1875 in. (4.76 mm) in thickness.4. Classifications4.1 The strip, sheet or plate is to be furnished in the following grades:4.1.1 R05200, unall
10、oyed tantalum, electron-beam furnace or vacuum-arc melted, or both,4.1.2 R05400, unalloyed tantalum, powder-metallurgy consolidation,4.1.3 R05255, tantalum alloy, 90 % tantalum, 10 % tungsten, electron-beam furnace or vacuum-arc melted, or both,1 This specification is under the jurisdiction of ASTM
11、Committee B10 on Reactive and Refractory Metals and Alloys and is the direct responsibility of SubcommitteeB10.03 on Niobium and Tantalum.Current edition approved Nov. 1, 2005Dec. 1, 2012. Published November 2005January 2013. Originally approved in 1982. Last previous edition approved in 20012005as
12、B708 01.B708 05. DOI: 10.1520/B0708-05.10.1520/B0708-12.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This
13、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 adequately depict all changes accurately, ASTM recommends that users consult prior editions
14、 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 Conshohocken, PA 19428-2959. United States14.1.4 R05252, tantalum alloy, 97.5 % tantalum, 2.5 %
15、tungsten, electron-beam furnace or vacuum-arc melted, or both,4.1.5 R05240, tantalum alloy, 60 % tantalum, 40 % niobium, electron-beam furnace or vacuum-arc melted, or both.4.1.6 For sputtering application see supplemental requirements to grades R05200 and R05400.5. Ordering Information5.1 Orders fo
16、r material under this specification shall include the following information as applicable:5.1.1 Quantity (weight, number of pieces or other suitable measure of quantity),5.1.2 Name of material (tantalum plate, sheet, or strip),5.1.3 Grade (alloy and method of manufacture) (see 4.1.1-4.1.6),5.1.4 AST
17、M Standard (Specification B708) and year of issue, and5.1.5 Additions to the specification and supplementary requirements if required.6. Materials and Manufacture6.1 Material covered by this specification shall be made from vacuum-arc melted or electron-beam melted ingots or powdermetallurgy consoli
18、dated unalloyed tantalum.6.2 The various tantalum mill products covered by this specification are formed with the conventional extrusion, forging, androlling equipment normally available in metal working plants.6.3 All material shall be supplied in the annealed condition unless otherwise specified b
19、y the purchaser.6.3.1 If specified on the purchase order, the material can be supplied in the “fully recrystallized” condition. In this case the plate,sheet, strip, or foil shall be 90 % minimum recrystallized as measured in accordance with 16.3. The terms “fully annealed,”“completely,” and other si
20、milar terms shall be considered the same as “fully recrystallized.”7. Chemical Composition7.1 The tantalum and tantalum alloy ingots and the tantalum powder metallurgy consolidated ingots for conversion to finishedproducts covered by this specification shall conform to the requirements for chemical
21、composition as prescribed in Table 1.7.1.1 Analysis for elements not listed in Table 1 and not normally expected in tantalum shall not be required unless specifiedat time of purchase.7.2 The manufacturers ingot (or powder metallurgy consolidated bar) analysis may be considered the chemical analysis
22、forproducts supplied under this specification. Alternately, an analysis of a representative sample of in-process material (or the finalproduct) from the same ingot may be substituted.7.3 When requested by the purchaser at the time of purchase, the seller shall furnish a report certifying the values
23、of carbon,oxygen, nitrogen, and hydrogen of the finished product as specified in Table 2 for each lot of material supplied. The performanceof this special provision shall be negotiated.8. Mechanical Properties8.1 Annealed materials supplied under this specification shall conform to the requirements
24、for mechanical properties asspecified in Table 3. No mechanical property requirements for unannealed (not heat treated) plate, sheet, or strip have beenestablished by this specification. Unless otherwise specified, material supplied under this specification will be supplied in theannealed condition.
25、TABLE 1 Chemical RequirementsContent, max, weight %ElementElectron-Beam Cast(R05200) Vacuum-ArcCast (R05200)Unalloyed TantalumSintered(R05400)UnalloyedTantalumElectron-BeamCast (R05255)Vacuum-ArcCast (R05255)90 % Tantalum10 % TungstenElectron-BeamCast (R05252)Vacuum-Arc Cast(R05252) 97.5 %Tantalum 2
26、.5 %TungstenElectron Beam Cast(R05240) Vacuum-ArcCast (R05240) 60 %Tantalum 40 %NiobiumC 0.010 0.010 0.010 0.010 0.010O 0.015 0.03 0.015 0.015 0.020N 0.010 0.010 0.010 0.010 0.010H 0.0015 0.0015 0.0015 0.0015 0.0015Fe 0.010 0.010 0.010 0.010 0.010Mo 0.020 0.020 0.020 0.020 0.020Nb 0.100 0.100 0.100
27、0.50 35.042.0Ni 0.010 0.010 0.010 0.010 0.010Si 0.005 0.005 0.005 0.005 0.005Ti 0.010 0.010 0.010 0.010 0.010W 0.05 0.05 9.011.0 2.03.5 0.050Ta remainder remainder remainder remainder remainderB708 1229. Metallurgical Properties9.1 Unless otherwise stated, the materials supplied under these specific
28、ations shall be in the fully annealed condition.TABLE 2 Additional Chemical Requirements for Finished Product (When Specified by the Purchaser)Content, max, weight %ElementElectron-Beam Cast(R05200) Vacuum-Arc Cast (R05200)Unalloyed TantalumSintered (R05400)Unalloyed TantalumElectron-Beam Cast(R0525
29、5) Vacuum-Arc Cast (R05255)90 % Tantalum 10 %TungstenElectron-BeamCast (R05252)Vacuum-Arc Cast(R05252)97.5 % Tantalum2.5 % TungstenElectron BeamCast (R05240)Vacuum-Arc Cast(R05240) 60 %Tantalum 40 %NiobiumO 0.025 0.035 0.025 0.025 0.025N 0.010 0.010 0.010 0.010 0.010H 0.0015 0.0015 0.0015 0.0015 0.0
30、015C 0.020 0.020 0.020 0.020 0.020TABLE 3 Mechanical Properties for Annealed Plate, Sheet, and StripGrade and FormAnnealed ConditionUltimate Tensile Strength,min, psi (MPa)Yield Strength, min, psi(MPa) (2 % Offset)Elongation, min, %(1-in. Gage Length)Unalloyed tantalum(R05200)(R05400)Plate, sheet an
31、d strip0.060 in. thick 30 000 (207) 20 000 (138) 20$0.060 in. thick 25 000 (172) 15 000 (103) 3090 % tantalum 10 % tungsten(R05255)Sheet and strip 70 000 (482) 60 000 (414) 15Plate 70 000 (482) 55 000 (379) 2097.5 % tantalum 2.5 % tungsten(R05252)0.125 in. thick 40 000 (276) 30 000 (207) 20$0.125 in
32、. thick 40 000 (276) 22 000 (152) 2560 % tantalum 40 % niobium(R05240)0.060 in. thick 35 000 (241) 20 000 (138) 25$0.060 in. thick 35 000 (241) 15 000 (103) 25TABLE 4 Dimensional Tolerances for Tantalum Sheet and PlateThickness ofTantalum in.(mm)Tolerance on Thickness,A plus orminus, in. (mm)Toleran
33、ce on Width (Slit),Bplus or minus, in. (mm)Tolerance on Sheared Lengths,in. (mm)Width under 6 in(152.4 mm)Width 6 to 24 in.(152.4 to 609.6 mm)Width under 6 in.(152.4 mm)Width 6 to 24 in.(152.4 to 609.6 mm)Length 12 in. (304.8mm) and UnderLength over 12 in.(304.8 mm)Plus Minus Plus Minus0.0051 to 0.0
34、10(0.129 to 0.254)0.0005 (0.0127) 0.012 (0.305) 116(1.59)0 14(6.35)00.011 to 0.015(0.279 to 0.381)0.0007 (0.0178) 0.001 (0.0254) 0.015 (0.381) 0.015 (0.381) 116(1.59)0 14(6.35)00.016 to 0.020(0.406 to 0.508)0.0008 (0.0203) 0.0015 (0.0381) 0.015 (0.381) 0.015 (0.381) 116(1.59)0 14(6.35)00.021 to 0.03
35、0(0.533 to 0.762)0.0015 (0.0381) 0.0025 (0.0635) 0.020 (0.508) 0.025 (0.635) 116(1.59)0 14(6.35)00.031 to 0.060(0.787 to 1.524)0.0025 (0.0635) 0.0035 (0.0889) 0.025 (0.635) 0.030 (0.762) 116(1.59)0 14(6.35)00.061 to 0.090(1.549 to 2.286)0.004 (0.1016) 0.005 (0.1270) 0.025 (0.635) 0.035 (0.889) 116(1
36、.59)0 14(6.35)00.091 to 0.125(2.311 to 3.175)0.006 (0.1524) 0.007 (0.1778) . . 116(1.59)0 14(6.35)00.126 to 0.187(3.200 to 4.750)0.010 (0.2540) 0.010 (0.2540) . . 116(1.59)0 14(6.35)0A Tolerance on thickness of sheet over 24 in. (609.6 mm) wide shall be 10 %10 % of the thickness.B Tolerance on width
37、 of sheared sheet shall be + 14 in. (6.35 mm), 0 in. (0 mm).B708 1239.2 Other conditions, such as cold-worked or stress-relieved, can be specified as agreed upon between the purchaser and themanufacturer at the time of the purchase.10. Special Requirements10.1 None specified.11. Significance of Nume
38、rical Limits11.1 For the purpose of determining compliance with the specified limits for requirements of the properties listed in thefollowing table, an observed value or a calculated value shall be rounded as indicated in accordance with the rounding methodsof Practice E29.Property Rounded Unit for
39、 Observedor Calculated ValueChemical composition, andtolerances (when expressed asdecimals)nearest unit in the last right-hand place offigures of the specified limitTensile strength and yieldstrengthnearest 1000 psi (10 MPa)Elongation nearest 1 %12. Permissible Variations in Dimensions12.1 Thickness
40、The variation in thickness of strip, sheet, and plate is given in the following table:12.1.1 Plate, Sheet and Strip, Table 4.12.2 WidthThe variation in width is give in the following table:12.2.1 Plate, Sheet and Strip, Table 4.12.3 LengthThe variation in length is given in the following table:12.3.
41、1 Plate, Sheet and Strip, Table 4.12.4 FlatnessThe permissible variation from a flat surface.12.4.1 The flatness tolerance for sheet and plate products supplied under this specification shall be a maximum of 6 % asdetermined by the procedure in Fig. 1.12.5 Quantity or Weight:12.5.1 For orders requir
42、ing up to 100 lb (45.4 kg), the manufacturer may overship by 10 %. When the order is for guaranteesup to 500 lb (226.8 kg), the manufacturer may overship an order by 5 %. The permissible overshipment for quantities larger thanthis shall be negotiated between the purchaser and the manufacturer.13. Co
43、ndition and Finish13.1 None specified.H = maximum distance between flat surface and lower surface of sheet.L = minimum distance between highest point on sheet and point of contact with flat surface.Flatness, percent = (H/L) 100FIG. 1 Plate and Sheet Flatness TolerancesB708 12414. Workmanship and App
44、earance14.1 Cracks, seams, slivers, blisters, burrs, and other injurious imperfections shall not exceed standards of acceptability agreedupon by the manufacturer and the purchaser.14.2 Finished strip, sheet, and plate shall be free of injurious internal and external imperfections of a nature that wi
45、ll interferewith the purpose for which it was intended.14.3 The finished strip, sheet, or plate shall be visibly free of oxide, grease, oil, residual lubricants, and other extraneousmaterials.14.4 Methods of testing for these defects and standards of acceptability shall be as agreed upon between the
46、 manufacturer andthe purchaser.14.5 The manufacturer shall be permitted to remove surface imperfections provided such removal does not reduce anydimension below the minimum permitted by the tolerances for that dimension.15. Number of Tests and Results15.1 Unless otherwise specified one sample per lo
47、t shall be sufficient for conformance to this specification.15.2 If mechanical testing is required (see 8.1), perform a longitudinal or transverse tension test on each lot of material.15.3 If end-product chemical tests are required (see 7.3), one chemical test from each lot of finished product shall
48、 be performed.15.4 If any sample or specimen exhibits obvious surface contamination or improper preparation, disqualifying it as a trulyrepresentative sample, it shall be discarded and a new sample or specimen substituted.15.5 If the results of any chemical or mechanical property test lot are not in
49、 conformance with the requirements of thisspecification, the lot may be retested at the option of the manufacturer. Retests shall be made on double the original number ofsamples from the same lot. Both retest values shall conform to the requirements specified. These acceptable retest values willbecome the test values for certification.15.6 If the results for the retest fail to conform to the specification, the material will be rejected.15.7 ReworkIf the results of the final sheet, strip, or plate inspections are not in conformance wi
