1、Designation: B 708 05Standard Specification forTantalum and Tantalum Alloy Plate, Sheet, and Strip1This standard is issued under the fixed designation B 708; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision
2、. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers unalloyed and alloyed tanta-lum plate, sheet, and strip as follows.1.1.1 R05200, unalloyed tantalum, ele
3、ctron-beam furnaceor vacuum-arc melt, or both,1.1.2 R05400, unalloyed tantalum, powder-metallurgy con-solidation,1.1.3 R05255, tantalum alloy, 90 % tantalum, 10 % tung-sten, electron-beam furnace of vacuum-arc melt, or both,1.1.4 R05252, tantalum alloy, 97.5 % tantalum, 2.5 % tung-sten, electron-bea
4、m furnace or vacuum-arc melt, or both, and1.1.5 R05240, tantalum alloy, 60 % tantalum, 40 % nobium,electron-beam furnace or vacuum-arc melt.1.2 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation only.1.3 This standard does not
5、purport to address all of thesafety and/or health problems, if any, associated with its use. Itis the responsibility of the user of this standard to establishappropriate safety and health practices and determine theapplicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM
6、Standards:2E8 Test Methods for Tension Testing of Metallic MaterialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE112 Test Methods for Determining Average Grain Size3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 annealed ma
7、terial, nplate, sheet, or strip that hasbeen annealed.3.1.2 annealing (annealed), nthe act of heat treating tosoften plate, sheet, or strip.3.1.3 lot, nall material produced from the same ingot or asingle powder blend at one time with the same cross section,and with the same nominal metallurgical pa
8、rameters.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 inwidth and from 0.005 in. (0.13 mm) to 0.1875 in. (4.76 mm) inthickness.3.1.6 strip, na flat product, may be supplied in coil, lessthan 6 in. (152.4 mm) in width and
9、 from 0.005 in. (0.13 mm)to 0.1875 in. (4.76 mm) in thickness.4. Classifications4.1 The strip, sheet or plate is to be furnished in thefollowing grades:4.1.1 R05200, unalloyed tantalum, electron-beam furnaceor vacuum-arc melted, or both,4.1.2 R05400, unalloyed tantalum, powder-metallurgy con-solidat
10、ion,4.1.3 R05255, tantalum alloy, 90 % tantalum, 10 % tung-sten, electron-beam furnace or vacuum-arc melted, or both,4.1.4 R05252, tantalum alloy, 97.5 % tantalum, 2.5 % tung-sten, electron-beam furnace or vacuum-arc melted, or both,4.1.5 R05240, tantalum alloy, 60 % tantalum, 40 % nio-bium, electro
11、n-beam furnace or vacuum-arc melted, or both.4.1.6 For sputtering application see supplemental require-ments to grades R05200 and R05400.5. Ordering Information5.1 Orders for material under this specification shall includethe following information as applicable:1This specification is under the juris
12、diction 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 Nov. 1, 2005. Published November 2005. Originallyapproved in 1982. Last previous edition approved in 2001 as B 708 01.2For
13、 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700
14、, West Conshohocken, PA 19428-2959, United States.5.1.1 Quantity (weight, number of pieces or other suitablemeasure 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 ASTM Standard (Specification B 708) and year
15、 ofissue, and5.1.5 Additions to the specification and supplementary re-quirements if required.6. Materials and Manufacture6.1 Material covered by this specification shall be madefrom vacuum-arc melted or electron-beam melted ingots orpowder metallurgy consolidated unalloyed tantalum.6.2 The various
16、tantalum mill products covered by thisspecification are formed with the conventional extrusion,forging, and rolling equipment normally available in metalworking plants.6.3 All material shall be supplied in the annealed conditionunless otherwise specified by the purchaser.6.3.1 If specified on the pu
17、rchase order, the material can besupplied in the “fully recrystallized” condition. In this case theplate, sheet, strip, or foil shall be 90 % minimum recrystallizedas measured in accordance with 16.3. The terms “fully an-nealed,” “completely,” and other similar terms shall be consid-ered the same as
18、 “fully recrystallized.”7. Chemical Composition7.1 The tantalum and tantalum alloy ingots and the tantalumpowder metallurgy consolidated ingots for conversion to fin-ished products covered by this specification shall conform tothe requirements for chemical composition as prescribed inTable 1.7.1.1 A
19、nalysis for elements not listed in Table 1 and notnormally expected in tantalum shall not be required unlessspecified at time of purchase.7.2 The manufacturers ingot (or powder metallurgy con-solidated bar) analysis may be considered the chemical analy-sis for products supplied under this specificat
20、ion. Alternately,an analysis of a representative sample of in-process material(or the final product) from the same ingot may be substituted.7.3 When requested by the purchaser at the time of pur-chase, the seller shall furnish a report certifying the values ofcarbon, oxygen, nitrogen, and hydrogen o
21、f the finished productas specified in Table 2 for each lot of material supplied. Theperformance of this special provision shall be negotiated.8. Mechanical Properties8.1 Annealed materials supplied under this specificationshall conform to the requirements for mechanical properties asspecified in Tab
22、le 3. No mechanical property requirements forunannealed (not heat treated) plate, sheet, or strip have beenestablished by this specification. Unless otherwise specified,material supplied under this specification will be supplied inthe annealed condition.9. Metallurgical Properties9.1 Unless otherwis
23、e stated, the materials supplied underthese specifications shall be in the fully annealed condition.9.2 Other conditions, such as cold-worked or stress-relieved, can be specified as agreed upon between the pur-chaser and the manufacturer at the time of the purchase.10. Special Requirements10.1 None
24、specified.11. Significance of Numerical Limits11.1 For the purpose of determining compliance with thespecified limits for requirements of the properties listed in thefollowing table, an observed value or a calculated value shallbe rounded as indicated in accordance with the roundingmethods of Practi
25、ce E 29.PropertyRounded Unit for Observedor Calculated ValueChemical composition, and toler-ances (when expressed as deci-mals)nearest unit in the last right-hand place of fig-ures of the specified limitTensile strength and yieldstrengthnearest 1000 psi (10 MPa)Elongation nearest 1 %12. Permissible
26、Variations in Dimensions12.1 ThicknessThe variation in thickness of strip, sheet,and plate is given in the following table:TABLE 1 Chemical RequirementsContent, max, weight %ElementElectron-Beam Cast(R05200) Vacuum-ArcCast (R05200)Unalloyed TantalumSintered(R05400)UnalloyedTantalumElectron-BeamCast
27、(R05255)Vacuum-ArcCast (R05255)90 % Tantalum10 % TungstenElectron-BeamCast (R05252)Vacuum-Arc Cast(R05252) 97.5 %Tantalum 2.5 %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 0.0
28、10H 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 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 rem
29、ainder remainderB70805212.1.1 Plate, Sheet and Strip, Table 4.12.2 WidthThe variation in width is give in the followingtable:12.2.1 Plate, Sheet and Strip, Table 4.12.3 LengthThe variation in length is given in the follow-ing table:TABLE 2 Additional Chemical Requirements for Finished Product (When
30、Specified by the Purchaser)Content, max, weight %ElementElectron-Beam Cast(R05200) Vacuum-Arc Cast (R05200)Unalloyed TantalumSintered (R05400)Unalloyed TantalumElectron-Beam Cast(R05255) Vacuum-Arc Cast (R05255)90 % Tantalum 10 %TungstenElectron-BeamCast (R05252)Vacuum-Arc Cast(R05252)97.5 % Tantalu
31、m2.5 % 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 0.0015C 0.020 0.020 0.020 0.020 0.020TABLE 3 Mechanical Properties for Annealed Plate, Sheet, and StripGrade and FormAn
32、nealed 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 and strip0.060 in. thick 30 000 (207) 20 000 (138) 20$0.060 in. thick 25 000 (172) 15 000 (103) 3090 % tantalum 10 % t
33、ungsten(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. thick 40 000 (276) 22 000 (152) 2560 % tantalum 40 % niobium(R05240)0.060 in. thick 35 000 (241) 20 000 (138) 25$0
34、.060 in. thick 35 000 (241) 15 000 (103) 25TABLE 4 Dimensional Tolerances for Tantalum Sheet and PlateThickness ofTantalum in.(mm)Tolerance on Thickness,Aplus orminus, in. (mm)Tolerance on Width (Slit),Bplus or minus, in. (mm)Tolerance on Sheared Lengths,in. (mm)Width under 6 in(152.4 mm)Width6to24i
35、n.(152.4 to 609.6 mm)Width under 6 in.(152.4 mm)Width6to24in.(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 0.010(0.129 to 0.254)0.0005 (0.0127) 0.012 (0.305)116(1.59)014(6.35)00.011 to 0.015(0.279 to 0.381)0.0007 (0.0178) 0.001 (0.0254
36、) 0.015 (0.381) 0.015 (0.381)116(1.59)014(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)014(6.35)00.021 to 0.030(0.533 to 0.762)0.0015 (0.0381) 0.0025 (0.0635) 0.020 (0.508) 0.025 (0.635)116(1.59)014(6.35)00.031 to 0.060(0.787 to 1.524)0.0025
37、 (0.0635) 0.0035 (0.0889) 0.025 (0.635) 0.030 (0.762)116(1.59)014(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(1.59)014(6.35)00.091 to 0.125(2.311 to 3.175)0.006 (0.1524) 0.007 (0.1778) . .116(1.59)014(6.35)00.126 to 0.187(3.200 to 4.750)0.010 (0.2
38、540) 0.010 (0.2540) . .116(1.59)014(6.35)0ATolerance on thickness of sheet over 24 in. (609.6 mm) wide shall be 6 10 % of the thickness.BTolerance on width of sheared sheet shall be +14 in. (6.35 mm), 0 in. (0 mm).B70805312.3.1 Plate, Sheet and Strip, Table 4.12.4 FlatnessThe permissible variation f
39、rom a flat sur-face.12.4.1 The flatness tolerance for sheet and plate productssupplied 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 requiring up to 100 lb (45.4 kg), themanufacturer may overship by 10 %. When the
40、 order is forguarantees up to 500 lb (226.8 kg), the manufacturer mayovership an order by 5 %. The permissible overshipment forquantities larger than this shall be negotiated between thepurchaser and the manufacturer.13. Condition and Finish13.1 None specified.14. Workmanship and Appearance14.1 Crac
41、ks, seams, slivers, blisters, burrs, and other inju-rious imperfections shall not exceed standards of acceptabilityagreed upon by the manufacturer and the purchaser.14.2 Finished strip, sheet, and plate shall be free of injuriousinternal and external imperfections of a nature that willinterfere with
42、 the purpose for which it was intended.14.3 The finished strip, sheet, or plate shall be visibly free ofoxide, grease, oil, residual lubricants, and other extraneousmaterials.14.4 Methods of testing for these defects and standards ofacceptability shall be as agreed upon between the manufacturerand t
43、he purchaser.14.5 The manufacturer shall be permitted to remove surfaceimperfections provided such removal does not reduce anydimension below the minimum permitted by the tolerances forthat dimension.15. Number of Tests and Results15.1 Unless otherwise specified one sample per lot shall besufficient
44、 for conformance to this specification.15.2 If mechanical testing is required (see 8.1), perform alongitudinal 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 beperformed.15.4 If an
45、y sample or specimen exhibits obvious surfacecontamination or improper preparation, disqualifying it as atruly representative sample, it shall be discarded and a newsample or specimen substituted.15.5 If the results of any chemical or mechanical propertytest lot are not in conformance with the requi
46、rements of thisspecification, the lot may be retested at the option of themanufacturer. Retests shall be made on double the originalnumber of samples from the same lot. Both retest values shallconform to the requirements specified. These acceptable retestvalues will become the test values for certif
47、ication.15.6 If the results for the retest fail to conform to thespecification, the material will be rejected.15.7 ReworkIf the results of the final sheet, strip, or plateinspections are not in conformance with the requirements ofthis specification, the lot may be reworked at the option of themanufa
48、cturer. The lot shall be acceptable if the results of alltests, after reworking, conform to this specification.16. Sampling and Test Methods16.1 Sampling:16.1.1 Samples for chemical test shall be taken from theingot or powder metallurgy bar. Care shall be taken to removeany surface contamination.16.
49、1.2 Samples for mechanical testing shall be taken fromthe finished material after all metallurgical processing. Thesamples may be taken prior to final inspection and minorH = 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) 3 100FIG. 1 Plate and Sheet Flatness TolerancesB708054surface conditioning by abrasion and pickling shall be repre-sentative of the finished product.16.1.3 Care shall be exercised to ensure that
