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This specification covers unalloyed and alloyed tantalum plate, sheet, and strip as follows. 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 of 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 % nobium, electron-beam furnace or vacuum-arc melt. The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
| Content, max, weight % | |||||
|---|---|---|---|---|---|
Element | 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 % Niobium |
| 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 |
| H | 0.0015 | 0.0015 | 0.0015 | 0.0015 | 0.0015 |
| Fe | 0.010 | 0.010 | 0.010 | 0.010 | 0.010 |
| Mo | 0.020 | 0.020 | 0.020 | 0.020 | 0.020 |
| Nb | 0.100 | 0.100 | 0.100 | 0.50 | 35.0-42.0 |
| Ni | 0.010 | 0.010 | 0.010 | 0.010 | 0.010 |
| Si | 0.005 | 0.005 | 0.005 | 0.005 | 0.005 |
| Ti | 0.010 | 0.010 | 0.010 | 0.010 | 0.010 |
| W | 0.05 | 0.05 | 9.0-11.0 | 2.0-3.5 | 0.050 |
| Ta | remainder | remainder | remainder | remainder | remainder |
| Content, max, weight % | |||||
|---|---|---|---|---|---|
Element | 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 % Niobium |
| 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 |
Grade and Form | Annealed Condition | |||
|---|---|---|---|---|
| Ultimate 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 strip | ||||
| < 0.060 in. thick | 30 000 (207) | 20 000 (138) | 20 | |
| ≥ 0.060 in. thick | 25 000 (172) | 15 000 (103) | 30 | |
| 90 % tantalum – 10 % tungsten (R05255) | ||||
| Sheet and strip | 70 000 (482) | 60 000 (414) | 15 | |
| Plate | 70 000 (482) | 55 000 (379) | 20 | |
| 97.5 % 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) | 25 | |
| 60 % tantalum – 40 % niobium (R05240) | ||||
| < 0.060 in. thick | 35 000 (241) | 20 000 (138) | 25 | |
| ≥ 0.060 in. thick | 35 000 (241) | 15 000 (103) | 25 | |