R31233 Cobalt vs. SAE-AISI A8 Steel
R31233 cobalt belongs to the cobalt alloys classification, while SAE-AISI A8 steel belongs to the iron alloys. There are 22 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is R31233 cobalt and the bottom bar is SAE-AISI A8 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 190 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 85 | |
| 74 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 700 to 1920 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 270 |
| Melting Completion (Liquidus), °C | 1350 | |
| 1480 |
| Melting Onset (Solidus), °C | 1330 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 440 | |
| 470 |
| Thermal Conductivity, W/m-K | 12 | |
| 37 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 8.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 9.5 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.6 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 8.4 | |
| 2.3 |
| Embodied Energy, MJ/kg | 110 | |
| 31 |
| Embodied Water, L/kg | 480 | |
| 73 |
Common Calculations
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 24 |
| Strength to Weight: Axial, points | 33 | |
| 25 to 68 |
| Strength to Weight: Bending, points | 26 | |
| 22 to 44 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 9.9 |
| Thermal Shock Resistance, points | 25 | |
| 22 to 62 |
Alloy Composition
| Boron (B), % | 0 to 0.015 | |
| 0 |
| Carbon (C), % | 0.020 to 0.1 | |
| 0.5 to 0.6 |
| Chromium (Cr), % | 23.5 to 27.5 | |
| 4.8 to 5.5 |
| Cobalt (Co), % | 44.7 to 63.3 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0 to 0.25 |
| Iron (Fe), % | 1.0 to 5.0 | |
| 88.5 to 91.9 |
| Manganese (Mn), % | 0.1 to 1.5 | |
| 0 to 0.5 |
| Molybdenum (Mo), % | 4.0 to 6.0 | |
| 1.2 to 1.7 |
| Nickel (Ni), % | 7.0 to 11 | |
| 0 to 0.3 |
| Nitrogen (N), % | 0.030 to 0.12 | |
| 0 |
| Phosphorus (P), % | 0 to 0.030 | |
| 0 to 0.030 |
| Silicon (Si), % | 0.050 to 1.0 | |
| 0.75 to 1.1 |
| Sulfur (S), % | 0 to 0.020 | |
| 0 to 0.030 |
| Tungsten (W), % | 1.0 to 3.0 | |
| 1.0 to 1.5 |