This specification covers unalloyed and alloyed tantalum rod and wire.
The materials covered by this specification are:
R05200, unalloyed tantalum, electron-beam furnace
or vacuum-arc melt, or both,
R05400, unalloyed tantalum, powder-metallurgy consolidation,
R05255, tantalum alloy, 90 % tantalum 10 % tungsten,
electron-beam furnace or vacuum-arc melt, or both,
R05252, tantalum alloy, 97.5 % tantalum 2.5 % tungsten, electron-beam furnace or vacuum-arc melt, or both, and
R05240 tantalum alloy, 60 % tantalum 40 % columbium, electron-beam furnace or vacuum-arc melt, or both.
The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are for
information only.
Chemical Composition
| Element |
Content, max, % weight Grades |
| Electron-Beam Cast (R05200) Vacuum-Arc Cast (R05200) Unalloyed Tantalum |
Sintered (R05400) Unalloyed Tantalum |
Electron-Beam Cast (R05255) Vacuum-Arc Cast (R05255) 90 % Tantalum 10 % Tungsten |
Electron-Beam Cast (R05252) Vacuum-Arc Cast (R05252) 97.5 % Tantalum 2.5 % Tungsten |
Electron-Beam Cast (R05240) Vacuum-Arc Cast (R05240) 60 % Tantalum 40 % Columbium |
| c |
0.010 |
0.010 |
0.010 |
0.010 |
0.010 |
| 0 |
0.015 |
0.03 |
0.015 |
0.015 |
0.020 |
| N |
0.010 |
0.010 |
0.010 |
0.010 |
0.010 |
| H |
0.0015 |
0.0015 |
0.0015 |
0.0015 |
0.0015 |
| Nb |
0.10 |
0.10 |
0.10 |
0.50 |
35.0-42.0 |
| Fe |
0.010 |
0.010 |
0.010 |
0.010 |
0.010 |
| Ti |
0.010 |
0.010 |
0.010 |
0.010 |
0.010 |
| w |
0.050 |
0.050 |
9.0-11.0 |
2.0-3.5 |
0.050 |
| Mo |
0.020 |
0.020 |
0.020 |
0.020 |
0.020 |
| Si |
0.005 |
0.005 |
0.005 |
0.005 |
0.005 |
| Ni |
0.010 |
0.010 |
0.010 |
0.010 |
0.010 |
| Ta |
remainder |
remainder |
remainder |
remainder |
remainder |
Additional Chemical Requirements for Finished Product (When Specified by the Purchaser)
| Element |
Content, max, % weight Grades |
| Electron-Beam Cast (R05200) Vacuum-Arc Cast (R05200) Unalloyed Tantalum |
Sintered (R05400) Unalloyed Tantalum |
Electron-Beam Cast (R05255) Vacuum-Arc Cast (R05255) 90 % Tantalum 10 % Tungsten |
Electron-Beam Cast (R05252) Vacuum-Arc Cast (R05252) 97.5 % Tantalum 2.5 % Tungsten |
Electron-Beam Cast (R05240) Vacuum-Arc Cast (R05240) 60 % Tantalum 40 % Columbium |
| O |
0.025 |
0.035 |
0.025 |
0.025 |
0.025 |
| N |
0.010 |
0.010 |
0.010 |
0.010 |
0.010 |
| H |
0.0015 |
0.0015 |
0.0015 |
0.0015 |
0.0015 |
| C |
0.020 |
0.020 |
0.020 |
0.020 |
0.020 |
Mechanical Properties for Rod and Wire, Annealed Condition
| |
Rod |
| 0.125 in. (3.18 mm) to 2.5 in. (63.5 mm) Diameter |
| Ultimate Tensile Strength, min, psi (MPa) |
Yield Strength, min, psi (MPa) |
Elongation, min, % 1 in. (25.4 mm) Gage Length |
| Unalloyed tantalum (R05200 and R05400) |
25 000 (172) |
15 000 (103) |
25 |
| 97.5 % tantalum 2.5 % tungsten (R05252) |
40 000 (276) |
28 000 (193) |
20 |
| 90 % tantalum 10 % tungsten R05255 |
70 000 (482) |
55 000 (379) |
20 |
| 60 % tantalum 40 % columbium (R05240) |
35 000 (244) |
15 000 (103) |
25 |
| |
Diameter, in. (mm) |
Ultimate Tensile Strength, min, psi (MPa) |
Elongation min, %A |
| Unalloyed tantalum (R05200 and R05400) |
0.010 (0.254) to 0.0149 (0.379) |
35 000 (241) |
10 |
| |
0.015 (0.381) to 0.0249 (0.633) |
35 000 (241) |
15 |
| |
0.025 (0.635) to 0.124 (3.14) |
30 000 (207) |
20 |
| 97.5 % tantalum 2.5 % tungsten (R05252) |
0.010 (0.254) to 0.0149 (0.379) |
40 000 (276) |
5 |
| |
0.015 (0.381) to 0.0249 (0.633) |
40 000 (276) |
10 |
| |
0.025 (0.635) to 0.124 (3.14) |
40 000 (276) |
15 |
| 90 % tantalum 10 % tungsten (R05255) |
0.010 (0.254) to 0.0149 (0.379) |
70 000 (482) |
5 |
| |
0.015 (0.381) to 0.0249 (0.633) |
70 000 (482) |
10 |
| |
0.025 (0.635) to 0.124 (3.14) |
70 000 (482) |
15 |
| 60 % tantalum 40 % columbium (R05240) |
0.010 (0.254) to 0.0149 |
35 000 (244) |
10 |
| |
(0.379) 0.015 (0.381) to 0.0249 (0.633) |
35 000 (244) |
15 |
| |
0.025 (0.635) to 0.124 (3.14) |
35 000 (244) |
20 |
Note:
A. 10-in. (254-mm) gage length to 0.050 in. (1.27-mm) diameter and 1-in. (25.4-mm) or 2-in. (50.8-mm) gage length over 0.050-in. (1.27-mm) diameter.