UNS R30012 Co-Cr-W Alloy
R30012 cobalt is a cobalt alloy. Cited properties are appropriate for the annealed condition. It has a fairly low ductility among cobalt alloys. In addition, it has a moderately high thermal conductivity and a moderately low electrical conductivity.
The graph bars on the material properties cards below compare R30012 cobalt to other cobalt alloys (top) 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
Compressive (Crushing) Strength
1770 MPa 260 x 103 psi
Elastic (Young's, Tensile) Modulus
220 GPa 32 x 106 psi
Elongation at Break
1.0 %
Fatigue Strength
320 MPa 46 x 103 psi
Poisson's Ratio
0.28
Rockwell C Hardness
48
Shear Modulus
86 GPa 12 x 106 psi
Tensile Strength: Ultimate (UTS)
830 MPa 120 x 103 psi
Tensile Strength: Yield (Proof)
650 MPa 94 x 103 psi
Thermal Properties
Latent Heat of Fusion
320 J/g
Melting Completion (Liquidus)
1470 °C 2670 °F
Melting Onset (Solidus)
1280 °C 2340 °F
Specific Heat Capacity
440 J/kg-K 0.1 BTU/lb-°F
Thermal Conductivity
15 W/m-K 8.5 BTU/h-ft-°F
Thermal Expansion
12 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
1.8 % IACS
Electrical Conductivity: Equal Weight (Specific)
1.8 % IACS
Otherwise Unclassified Properties
Density
8.8 g/cm3 550 lb/ft3
Embodied Carbon
8.3 kg CO2/kg material
Embodied Energy
120 MJ/kg 50 x 103 BTU/lb
Embodied Water
480 L/kg 58 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
7.7 MJ/m3
Resilience: Unit (Modulus of Resilience)
960 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
23 points
Strength to Weight: Axial
26 points
Strength to Weight: Bending
22 points
Thermal Diffusivity
3.8 mm2/s
Thermal Shock Resistance
23 points
Alloy Composition
| Co | 47.5 to 64.1 | |
| Cr | 27 to 32 | |
| W | 7.5 to 9.5 | |
| C | 1.4 to 2.0 | |
| Ni | 0 to 3.0 | |
| Fe | 0 to 3.0 | |
| Si | 0 to 2.0 | |
| Mo | 0 to 1.0 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015