UNS R05200 Cast Unalloyed Tantalum
R05200 tantalum is a tantalum alloy. It has a fairly high density and a fairly low heat capacity among alloys in the same category.
The properties of R05200 tantalum include three common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare R05200 tantalum to: tantalum alloys (top), all alloys in the same category (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
190 GPa 27 x 106 psi
Elongation at Break
1.1 to 28 %
Poisson's Ratio
0.34
Shear Modulus
69 GPa 10 x 106 psi
Tensile Strength: Ultimate (UTS)
210 to 540 MPa 31 to 78 x 103 psi
Tensile Strength: Yield (Proof)
140 to 390 MPa 20 to 57 x 103 psi
Thermal Properties
Latent Heat of Fusion
140 J/g
Specific Heat Capacity
140 J/kg-K 0.034 BTU/lb-°F
Thermal Conductivity
59 W/m-K 34 BTU/h-ft-°F
Thermal Expansion
6.5 µm/m-K
Otherwise Unclassified Properties
Density
17 g/cm3 1040 lb/ft3
Embodied Water
650 L/kg 77 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
5.5 to 53 MJ/m3
Resilience: Unit (Modulus of Resilience)
50 to 420 kJ/m3
Stiffness to Weight: Axial
6.2 points
Stiffness to Weight: Bending
11 points
Strength to Weight: Axial
3.6 to 9.0 points
Strength to Weight: Bending
4.8 to 8.8 points
Thermal Diffusivity
25 mm2/s
Thermal Shock Resistance
13 to 32 points
Alloy Composition
| Ta | 99.8 to 100 | |
| Nb | 0 to 0.1 | |
| W | 0 to 0.050 | |
| Mo | 0 to 0.020 | |
| O | 0 to 0.015 | |
| C | 0 to 0.010 | |
| Ni | 0 to 0.010 | |
| Fe | 0 to 0.010 | |
| N | 0 to 0.010 | |
| Ti | 0 to 0.010 | |
| Si | 0 to 0.0050 | |
| H | 0 to 0.0015 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM F560: Standard Specification for Unalloyed Tantalum for Surgical Implant Applications (UNS R05200, UNS R05400)
ASTM B365: Standard Specification for Tantalum and Tantalum Alloy Rod and Wire
ASTM B521: Standard Specification for Tantalum and Tantalum Alloy Seamless and Welded Tubes
ASTM B708: Standard Specification for Tantalum and Tantalum Alloy Plate, Sheet, and Strip