ASTM B708-98

NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn. Contact ASTM International (www.astm.org) for the latest information.
Designation: B 708 – 98
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
1
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 3.1.3 strip—a flat product, may be supplied in coil, less than
6 in. (152.4 mm) in width and from 0.005 in. (0.13 mm) to
1.1 This specification covers unalloyed and alloyed
0.1875 in. (4.76 mm) in thickness.
tantalum plate, sheet, and strip.
3.1.4 lot—all material produced from the same ingot or a
1.2 The materials covered by this specification are:
single powder blend at one time with the same cross section,
1.2.1 R05200, unalloyed tantalum, electron-beam furnace
and with the same nominal metallurgical parameters.
or vacuum-arc melt, or both,
1.2.2 R05400, unalloyed tantalum, powder-metallurgy
4. Ordering Information
consolidation,
4.1 Orders for material under this specification shall include
1.2.3 R05255, tantalum alloy, 90 % tantalum, 10 %
the following information as applicable:
tungsten, electron-beam furnace of vacuum-arc melt, or both,
4.1.1 Quantity (weight or number of pieces),
1.2.4 R05252, tantalum alloy, 97.5 % tantalum, 2.5 %
4.1.2 Name of material (tantalum plate, sheet, or strip),
tungsten, electron-beam furnace or vacuum-arc melt, or both.
4.1.3 Type (see 1.2),
1.2.5 R05240, tantalum alloy, 60 % tantalum, 40 % nobium,
4.1.4 Method of manufacture (Section 5),
electron-beam furnace or vacuum-arc melt.
4.1.5 ASTM designation,
1.3 The values stated in inch-pound units are to be regarded
4.1.6 Quality and finish (Section 9), and
as the standard. The values given in parentheses are for
4.1.7 Additions to the specification and supplementary
information only.
requirements if required.
1.4 The following precautionary caveat pertains only to the
test methods portion, Section 13, of this specification: This
5. Materials and Manufacture
standard does not purport to address all of the safety problems,
5.1 Material covered by this specification shall be made
if any, associated with its use. It is the responsibility of the user
from vacuum-arc melted or electron-beam melted ingots or
of this standard to establish appropriate safety and health
powder metallurgy consolidated unalloyed tantalum.
practices and determine the applicability of regulatory
5.2 The various tantalum mill products covered by this
limitations prior to use.
specification are formed with the conventional extrusion,
forging, and rolling equipment normally available in metal
2. Referenced Documents
working plants.
2.1 ASTM Standards:
2
E 8 Test Methods for Tension Testing of Metallic Materials
6. Chemical Composition
E 29 Practice for Using Significant Digits in Test Data to
6.1 The tantalum and tantalum alloy ingots and the tantalum
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Determine Conformance with Specifications
powder metallurgy consolidated ingots for conversion to
finished products covered by this specification shall conform to
3. Terminology
the requirements for chemical composition as prescribed in
3.1 Definitions of Terms Specific to This Standard:
Table 1.
3.1.1 plate—a flat product more than 0.1853 in. (4.7 mm) in
6.1.1 Analysis for elements not listed in Table 1 and not
thickness.
normally expected in tantalum shall not be required unless
3.1.2 sheet—a flat product 6 in. (152.4 mm) or more in
specified at time of purchase.
width and from 0.005 in. (0.13 mm) to 0.1875 in. (4.76 mm) in
6.2 The manufacturer’s ingot analysis shall be considered
thickness.
the chemical analysis for products supplied under this
specification.
1
This specification is under the jurisdiction of ASTM Committee B-10 on
6.3 When requested by the purchaser at the time of
Reactive and Refractory Metals and Alloysand is the direct responsibility of
purchase, the seller shall furnish a report certifying the values
Subcommittee B10.03on Niobium and Tantalum.
Current edition approved May 10, 1998. Published September 1998. Originally
of carbon, oxygen, nitrogen, and hydrogen as specified in Table
published as B 708 – 82. Last previous edition B 708 – 92.
2 for each lot of material supplied. The performance of this
2
Annual Book of ASTM Standards, Vol 03.01.
3
special provision shall be negotiated.
Annual Book of ASTM Standards, Vol 14.02.
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B 708
TABLE 1 Chemical Requirements Content, max, weight %
Electron-Beam Electron-Beam Electron-Beam
Electron Beam Cast
Cast (R05200) Cast (R052
...