ASTM B708-01

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Designation: B 708 – 01
Standard Specification for
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Tantalum and Tantalum Alloy Plate, Sheet, and Strip
This standard is issued under the fixed designation B 708; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.1 plate—a flat product more than 0.1853 in. (4.7 mm) in
thickness.
1.1 This specification covers unalloyed and alloyed tanta-
3.1.2 sheet—a flat product 6 in. (152.4 mm) or more in
lum plate, sheet, and strip.
width and from 0.005 in. (0.13 mm) to 0.1875 in. (4.76 mm) in
1.2 The materials covered by this specification are:
thickness.
1.2.1 R05200, unalloyed tantalum, electron-beam furnace
3.1.3 strip—aflatproduct,maybesuppliedincoil,lessthan
or vacuum-arc melt, or both,
6 in. (152.4 mm) in width and from 0.005 in. (0.13 mm) to
1.2.2 R05400, unalloyed tantalum, powder-metallurgy con-
0.1875 in. (4.76 mm) in thickness.
solidation,
3.1.4 lot—all material produced from the same ingot or a
1.2.3 R05255, tantalum alloy, 90 % tantalum, 10 % tung-
single powder blend at one time with the same cross section,
sten, electron-beam furnace of vacuum-arc melt, or both,
and with the same nominal metallurgical parameters.
1.2.4 R05252, tantalum alloy, 97.5 % tantalum, 2.5 % tung-
sten, electron-beam furnace or vacuum-arc melt, or both.
4. Ordering Information
1.2.5 R05240, tantalum alloy, 60 % tantalum, 40 % nobium,
4.1 Orders for material under this specification shall include
electron-beam furnace or vacuum-arc melt.
the following information as applicable:
1.3 The values stated in inch-pound units are to be regarded
4.1.1 Quantity (weight or number of pieces),
as the standard. The values given in parentheses are for
4.1.2 Name of material (tantalum plate, sheet, or strip),
information only.
4.1.3 Type (see 1.2),
1.4 The following precautionary caveat pertains only to the
4.1.4 Method of manufacture (Section 5),
test methods portion, Section 13, of this specification: This
4.1.5 ASTM designation,
standard does not purport to address all of the safety problems,
4.1.6 Quality and finish (Section 10), and
if any, associated with its use. It is the responsibility of the user
4.1.7 Additions to the specification and supplementary re-
of this standard to establish appropriate safety and health
quirements if required.
practices and determine the applicability of regulatory limita-
tions prior to use.
5. Materials and Manufacture
2. Referenced Documents 5.1 Material covered by this specification shall be made
from vacuum-arc melted or electron-beam melted ingots or
2.1 ASTM Standards:
2 powder metallurgy consolidated unalloyed tantalum.
E 8 Test Methods forTensionTesting of Metallic Materials
5.2 The various tantalum mill products covered by this
E 29 Practice for Using Significant Digits in Test Data to
3 specification are formed with the conventional extrusion,
Determine Conformance with Specifications
forging, and rolling equipment normally available in metal
E 112 Test Methods for Determining the Average Grain
2 working plants.
Size
6. Chemical Composition
3. Terminology
6.1 The tantalum and tantalum alloy ingots and the tantalum
3.1 Definitions of Terms Specific to This Standard:
powder metallurgy consolidated ingots for conversion to fin-
ished products covered by this specification shall conform to
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This specification is under the jurisdiction of ASTM Committee B10 on
the requirements for chemical composition as prescribed in
Reactive and Refractory Metals and Alloys and is the direct responsibility of
Table 1 and Table 2.
Subcommittee B10.03 on Niobium and Tantalum.
Current edition approved Nov. 10, 2001. Published January 2002. Originally 6.1.1 Analysis for elements not listed in Table 1 and not
published as B 708 – 82. Last previous edition B 708 – 98.
normally expected in tantalum shall not be required unless
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Annual Book of ASTM Standards, Vol 03.01.
specified at time of purchase.
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Annual Book of ASTM Standards, Vol 14.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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B 708
TABLE 1 Chemical Requirements
Content, max, weight %
Electron-Beam Electron-Beam
Electron Beam Cast
Electron-Beam Cast Sintered Cast (R05255) Cast (R05252)
(R05240) Vacuum-Arc
(R05200) Vacuum-Arc (R05400) Vacuum-Arc Vacuum-Arc Cast
Element Cast (R05240) 60 %
Cast (R05200) Unalloyed Cast (R05255) (R05252) 97.5 %
Tantalum 40 %
Unalloyed Tantalum Tantalum 90 % Tantalum Tantalum 2.5 %
Columbium
10 % Tungsten Tungsten
C 0.010 0.010 0.010 0.010 0.010
O 0.015 0.03 0.015 0.015 0.020
N 0.010 0.010 0.010 0.010 0.010
...