R31233 Cobalt vs. EN 1.6570 Steel
R31233 cobalt belongs to the cobalt alloys classification, while EN 1.6570 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 R31233 cobalt and the bottom bar is EN 1.6570 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 190 |
| Elongation at Break, % | 17 | |
| 11 to 17 |
| Fatigue Strength, MPa | 220 | |
| 500 to 660 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 85 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 910 to 1130 |
| Tensile Strength: Yield (Proof), MPa | 420 | |
| 760 to 1060 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 250 |
| Melting Completion (Liquidus), °C | 1350 | |
| 1460 |
| Melting Onset (Solidus), °C | 1330 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 440 | |
| 470 |
| Thermal Conductivity, W/m-K | 12 | |
| 40 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 7.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 8.8 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.6 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 8.4 | |
| 1.7 |
| Embodied Energy, MJ/kg | 110 | |
| 23 |
| Embodied Water, L/kg | 480 | |
| 56 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 | |
| 120 to 140 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 410 | |
| 1520 to 3010 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 23 | |
| 24 |
| Strength to Weight: Axial, points | 33 | |
| 32 to 40 |
| Strength to Weight: Bending, points | 26 | |
| 27 to 31 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 11 |
| Thermal Shock Resistance, points | 25 | |
| 27 to 33 |
Alloy Composition
| Boron (B), % | 0 to 0.015 | |
| 0 |
| Carbon (C), % | 0.020 to 0.1 | |
| 0.28 to 0.35 |
| Chromium (Cr), % | 23.5 to 27.5 | |
| 1.0 to 1.4 |
| Cobalt (Co), % | 44.7 to 63.3 | |
| 0 |
| Iron (Fe), % | 1.0 to 5.0 | |
| 94 to 96.2 |
| Manganese (Mn), % | 0.1 to 1.5 | |
| 0.6 to 1.0 |
| Molybdenum (Mo), % | 4.0 to 6.0 | |
| 0.3 to 0.5 |
| Nickel (Ni), % | 7.0 to 11 | |
| 1.6 to 2.1 |
| Nitrogen (N), % | 0.030 to 0.12 | |
| 0 |
| Phosphorus (P), % | 0 to 0.030 | |
| 0 to 0.020 |
| Silicon (Si), % | 0.050 to 1.0 | |
| 0 to 0.6 |
| Sulfur (S), % | 0 to 0.020 | |
| 0 to 0.015 |
| Tungsten (W), % | 1.0 to 3.0 | |
| 0 |