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ASTM B708-05

ASTM B708-05

Standard Specification for Tantalum and Tantalum Alloy Plate, Sheet, and Strip

2013-02-04 /Historical
Superseeded by:

This specification covers the standard requirements for tantalum and tantalum alloy plate, sheet, and strip in the following grades: R05200, R05400, R05255, R05252, and R05240. The various tantalum mill products covered by this specification shall be formed with the conventional extrusion, forging, and rolling equipment normally available in metal working plants. Materials shall be made from vacuum-arc or electron-beam melted ingots or powder metallurgy consolidated unalloyed tantalum and shall be supplied in the annealed condition. Chemical analysis shall be conducted to determine the chemical composition of the materials which shall conform to the requirements for carbon, oxygen, nitrogen, hydrogen, iron, molybdenum, niobium, nickel, silicon, titanium, tungsten, and tantalum. The mechanical properties of the materials shall also meet the specified tensile strength, yield strength, and elongation limits as shall be determined by a longitudinal or transverse tension test method.


1.1 This specification covers unalloyed and alloyed tantalum plate, sheet, and strip as follows.

1.1.1 R05200, unalloyed tantalum, 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-beam furnace or vacuum-arc melt, or both, and

1.1.5 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 regarded as the standard. The values given in parentheses are for information only.

This standard does not purport to address all of the safety and/or health problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

tantalum; tantalum niobium alloy; tantalum plate; tantalum sheet; tantalum strip; tantalum tungsten alloy; Ta-2.5 %W; Ta-10 %W; Ta-40 %Nb
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