Heat Treated Cast R30075 Alloy
Heat treated cast R30075 cobalt is a type of R30075 cobalt. The graph bars on the material properties cards below compare heat treated cast R30075 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
Elastic (Young's, Tensile) Modulus
220 GPa 32 x 106 psi
Elongation at Break
12 %
Fatigue Strength
250 MPa 37 x 103 psi
Poisson's Ratio
0.29
Reduction in Area
20 %
Shear Modulus
87 GPa 13 x 106 psi
Tensile Strength: Ultimate (UTS)
960 MPa 140 x 103 psi
Tensile Strength: Yield (Proof)
500 MPa 72 x 103 psi
Thermal Properties
Latent Heat of Fusion
320 J/g
Melting Completion (Liquidus)
1360 °C 2480 °F
Melting Onset (Solidus)
1290 °C 2360 °F
Specific Heat Capacity
450 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
13 W/m-K 7.6 BTU/h-ft-°F
Thermal Expansion
12 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.1 % IACS
Otherwise Unclassified Properties
Density
8.4 g/cm3 530 lb/ft3
Embodied Carbon
8.1 kg CO2/kg material
Embodied Energy
110 MJ/kg 46 x 103 BTU/lb
Embodied Water
530 L/kg 63 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
99 MJ/m3
Resilience: Unit (Modulus of Resilience)
560 kJ/m3
Stiffness to Weight: Axial
15 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
32 points
Strength to Weight: Bending
26 points
Thermal Diffusivity
3.5 mm2/s
Thermal Shock Resistance
25 points
Alloy Composition
| Co | 58.7 to 68 | |
| Cr | 27 to 30 | |
| Mo | 5.0 to 7.0 | |
| Mn | 0 to 1.0 | |
| Si | 0 to 1.0 | |
| Fe | 0 to 0.75 | |
| Ni | 0 to 0.5 | |
| C | 0 to 0.35 | |
| N | 0 to 0.25 | |
| W | 0 to 0.2 | |
| Al | 0 to 0.1 | |
| Ti | 0 to 0.1 | |
| P | 0 to 0.020 | |
| S | 0 to 0.010 | |
| B | 0 to 0.010 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
ASTM F75: Standard Specification for Cobalt-28 Chromium-6 Molybdenum Alloy Castings and Casting Alloy for Surgical Implants (UNS R30075)
ISO 5832-4: Implants for Surgery - Metallic Materials - Part 4: Cobalt-Chromium-Molybdenum Casting Alloy