R31538 Cobalt vs. ASTM A732 Cast Steel
R31538 cobalt belongs to the cobalt alloys classification, while ASTM A732 cast steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is R31538 cobalt and the bottom bar is ASTM A732 cast steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 190 |
| Elongation at Break, % | 13 to 23 | |
| 4.0 to 25 |
| Fatigue Strength, MPa | 310 to 480 | |
| 230 to 750 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 86 | |
| 72 to 73 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 to 1360 | |
| 460 to 1470 |
| Tensile Strength: Yield (Proof), MPa | 580 to 930 | |
| 310 to 1340 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 250 to 260 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1440 to 1460 |
| Melting Onset (Solidus), °C | 1290 | |
| 1400 to 1420 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 to 480 |
| Thermal Conductivity, W/m-K | 13 | |
| 39 to 50 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 7.1 to 7.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 8.2 to 8.9 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 7.8 to 7.9 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 1.4 to 1.7 |
| Embodied Energy, MJ/kg | 110 | |
| 19 to 24 |
| Embodied Water, L/kg | 530 | |
| 47 to 54 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 200 | |
| 45 to 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 750 to 1920 | |
| 260 to 4770 |
| Stiffness to Weight: Axial, points | 15 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 34 to 45 | |
| 16 to 52 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 17 to 37 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 10 to 14 |
| Thermal Shock Resistance, points | 25 to 33 | |
| 14 to 43 |