Pressure Sintered (Hot Pressed) R30075 Alloy
Hot pressed R30075 cobalt is a type of R30075 cobalt. It has the highest strength compared to the other variants of R30075 cobalt. The graph bars on the material properties cards below compare hot pressed 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
250 GPa 36 x 106 psi
Elongation at Break
12 %
Fatigue Strength
840 MPa 120 x 103 psi
Poisson's Ratio
0.29
Reduction in Area
20 %
Shear Modulus
98 GPa 14 x 106 psi
Tensile Strength: Ultimate (UTS)
1280 MPa 190 x 103 psi
Tensile Strength: Yield (Proof)
840 MPa 120 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)
140 MJ/m3
Resilience: Unit (Modulus of Resilience)
1410 kJ/m3
Stiffness to Weight: Axial
17 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
42 points
Strength to Weight: Bending
31 points
Thermal Diffusivity
3.5 mm2/s
Thermal Shock Resistance
29 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