R05200 (melted pure tantalum) and R05400 (sintered pure tantalum) are available alloy options, each with distinct properties suited for different applications. These variations allow engineers to select the most suitable grade based on their specific performance requirements.
- Ta-R05200 is unalloyed, commercially pure tantalum known for its excellent corrosion resistance and high ductility, making it ideal for chemical processing and medical applications.
- Ta-R05400 offers high purity and precise impurity control, along with a high-quality surface finish to enhance performance in capacitor-grade applications. Leakage current testing is applied to ensure reliability.
- Ta-T05400-Si-Doped contains a small amount of silicon, resulting in a fine grain structure and stability, even after exposure to high temperatures. Leakage current testing is applied to ensure reliability.
Chemical composition
| Element | ASTM F560 UNS R05200ᵃ % |
ASTM F560 UNS R05400ᵇ % |
| Carbon | 0.020 max | 0.020 max |
| Oxygen | 0.025 max | 0.035 max |
| Nitrogen | 0.010 max | 0.010 max |
| Hydrogen | 0.0015 max | 0.0015 max |
ᵃ Electron-beam or vacuum-arc cast tantalum
ᵇ Sintered tantalum
Physical properties - R05200 Tantalum
| Metric | English | |
| Density | 16.60 g/cm³ | 0.600 lb/in³ |
| Modulus of elasticity | 179 - 186 GPa | 26,000 - 26,800 ksi |
| Electrical resistivity | 1.24 10-5 μohm*cm | 1.24 10-5 μohm*in |
| Thermal conductivity | 59.4 W/(m-K) | 412 BTU-in/(hr-ft²-°F) |
| Coefficient of thermal expansion | 6.5 µm/(m-°C) | 3.61 µin/(in-°F) |
* Values are calculated at 20 °C [68 °F]
Physical properties - R05400 Tantalum
| Metric | English | |
| Density | 16.60 g/cm³ | 0.600 lb/in³ |
| Modulus of elasticity | 186 GPa | 26,800 ksi |
| Electrical resistivity | 1.24 10-5 μohm*cm | 1.24 10-5 μohm*in |
| Thermal conductivity | 59.4 W/(m-K) | 412 BTU-in/(hr-ft²-°F) |
| Coefficient of thermal expansion | 6.5 µm/(m-°C) | 3.61 µin/(in-°F) |
* Values are calculated at 20 °C [68 °F]
Mechanical properties
| Condition | Thickness | Yield strength (0.2% offset) |
Ultimate tensile strength | Elongation % |
| Cold worked | All | 345 MPa [50,000 psi] | 480 MPa [70,000 psi] | 1 |
| Annealed | 0.15 to 0.25 mm [0.005 to 0.0099 in] |
- | 240 MPa [35,000 psi] | 8 |
| 0.25 to 0.38 mm [0.010 to 0.0149 in] |
- | 240 MPa [35,000 psi] | 10 | |
| Over 0.38 to 0.63 mm [0.015 to 0.0249 in] |
- | 240 MPa [35,000 psi] | 15 | |
| Over 3.14 to 63.5 mm [0.125 to 2.5 in] |
140 MPa [20,000 psi] | 170 MPa [25,000 psi] | 25 |
* Values are typical and may not represent all diameters. Test method will affect results.