Unalloyed Tantalum is supplied to ASTM F560 – R05200 composition limits. Tantalum is selected for its corrosion resistance, thermal conductivity, high melting point, and ability to form a dielectric oxide film.
Tantalum is very ductile and can be readily cold formed due to a low work hardening rate. Welding can be accomplished via resistance, TIG, or electron beam methods, with care taken to protect the weld and heat affected zone from air during welding. Because of the potential for hydrogen embrittlement, Tantalum can not be used for extended service in air or other oxidizing atmospheres above 260°C unless a protective inert atmosphere or vacuum is provided.
Available Sizes:
Tantalum is available from Hamilton Precision Metals as strip product from 0.0005” to 0.035” (0.0127 mm to 0.889 mm) in widths up to 12.0” (304.8 mm). The material
conforms to UNS R05200 and meets the requirements of ASTM F560 and ASTM B708.
Nominal Composition
| TANTALUM
NOMINAL COMPOSITION |
| Carbon |
0.010%
|
| Oxygen |
0.0150%
|
| Nitrogen |
0.010%
|
| Hydrogen |
0.0015%
|
| Niobium |
0.100%
|
| Iron |
0.010%
|
| Titanium |
0.010%
|
| Tungsten |
0.05%
|
| Molybdenum |
0.020%
|
| Silicon |
0.0050%
|
| Nickel |
0.010%
|
| Tantalum |
Balance
|
Mechanical Properties
| TANTALUM MECHANICAL PROPERTIES |
|
ANNEALED |
COLD ROLLED (90%) |
| Ultimate Tensile Strength |
40,000 PSI |
125,000 PSI |
| Yield Strength (0.2% Offset) |
26,000 PSI
|
118,000 PSI
|
| Elongation in 2” * |
50%
|
2% |
| Modulus of Elasticity (Tension) |
26 X 106
PSI
|
- |
| Hardness |
35 HRb
|
20 HRc |
Tantalum can also be provided in the cold rolled and stress relieved condition
to ASTM F560 limits.
*The measured elongation will be less as thickness decreases to 0.002” and less.
These values may be adjusted by control of process variables – consult HPM for desired values.
Physical Properties
| TANTALUM PHYSICAL PROPERTIES |
| Density |
0.602 lb/in3 |
| Melting Point |
2996°C |
| Electrical Resistivity @ R.T. |
12.5 Microhm·cm |
|
Thermal Conductivity @ R.T.
|
54.4 W/m·K
|
Thermal Expansion Coefficient
(20 to 500°C)
(20 to 1000°C) |
6.7 X 10-6
6.96 X 10-6/°C
|
| Temperature Coefficient of Resistivity |
3820 ppm/°C |
Typical values to guide alloy selection but are not a guarantee of minimum or maximum.