Forgings, Fasteners, Boltings, Stud Bolts, Screws, Nuts
ASTM B365 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.
| Element | C | O | N | H | Nb | Fe | Ti | W | Mo | Si | Ni | Ta | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Content, max, % weight Grades | Electron-Beam Cast (R05200) Vacuum-Arc Cast (R05200) Unalloyed Tantalum | 0.01 | 0.015 | 0.01 | 0.0015 | 0.1 | 0.01 | 0.01 | 0.05 | 0.02 | 0.005 | 0.01 | remainder |
| Sintered (R05400) Unalloyed Tantalum | 0.01 | 0.03 | 0.01 | 0.0015 | 0.1 | 0.01 | 0.01 | 0.05 | 0.02 | 0.005 | 0.01 | remainder | |
| Electron-Beam Cast (R05255) Vacuum-Arc Cast (R05255) 90 % Tantalum 10 % Tungsten | 0.01 | 0.015 | 0.01 | 0.0015 | 0.1 | 0.01 | 0.01 | 9.0-11.0 | 0.02 | 0.005 | 0.01 | remainder | |
| Electron-Beam Cast (R05252) Vacuum-Arc Cast (R05252) 97.5 % Tantalum 2.5 % Tungsten | 0.01 | 0.015 | 0.01 | 0.0015 | 0.5 | 0.01 | 0.01 | 2.0-3.5 | 0.02 | 0.005 | 0.01 | remainder | |
| Electron-Beam Cast (R05240) Vacuum-Arc Cast (R05240) 60 % Tantalum 40 % Columbium | 0.01 | 0.02 | 0.01 | 0.0015 | 35.0-42.0 | 0.01 | 0.01 | 0.05 | 0.02 | 0.005 | 0.01 | remainder | |
| 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 | |
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