Annealed UNS R05200 Cast Unalloyed Tantalum
Annealed R05200 tantalum is R05200 tantalum in the annealed condition. It has the lowest strength and highest ductility compared to the other variants of R05200 tantalum. The graph bars on the material properties cards below compare annealed 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
28 %
Poisson's Ratio
0.34
Shear Modulus
69 GPa 10 x 106 psi
Tensile Strength: Ultimate (UTS)
210 MPa 31 x 103 psi
Tensile Strength: Yield (Proof)
140 MPa 20 x 103 psi
Thermal Properties
Latent Heat of Fusion
140 J/g
Melting Completion (Liquidus)
3020 °C 5460 °F
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)
53 MJ/m3
Resilience: Unit (Modulus of Resilience)
50 kJ/m3
Stiffness to Weight: Axial
6.2 points
Stiffness to Weight: Bending
11 points
Strength to Weight: Axial
3.6 points
Strength to Weight: Bending
4.8 points
Thermal Diffusivity
25 mm2/s
Thermal Shock Resistance
13 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
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