EN 1.7231 Steel vs. R30021 Cobalt
EN 1.7231 steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is EN 1.7231 steel and the bottom bar is R30021 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 220 |
| Elongation at Break, % | 11 to 12 | |
| 9.0 |
| Fatigue Strength, MPa | 360 to 500 | |
| 250 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 790 to 930 | |
| 700 |
| Tensile Strength: Yield (Proof), MPa | 570 to 800 | |
| 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 330 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1350 |
| Melting Onset (Solidus), °C | 1420 | |
| 1190 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 450 |
| Thermal Conductivity, W/m-K | 46 | |
| 15 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 1.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.8 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 8.0 |
| Embodied Energy, MJ/kg | 20 | |
| 110 |
| Embodied Water, L/kg | 51 | |
| 520 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 87 to 100 | |
| 57 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 870 to 1700 | |
| 570 |
| Stiffness to Weight: Axial, points | 13 | |
| 15 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 28 to 33 | |
| 23 |
| Strength to Weight: Bending, points | 24 to 27 | |
| 21 |
| Thermal Diffusivity, mm2/s | 12 | |
| 3.8 |
| Thermal Shock Resistance, points | 23 to 27 | |
| 21 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.45 | |
| 0.2 to 0.35 |
| Chromium (Cr), % | 0.8 to 1.2 | |
| 26 to 29 |
| Cobalt (Co), % | 0 | |
| 61.7 to 67.3 |
| Iron (Fe), % | 96.4 to 98.1 | |
| 0 to 3.0 |
| Manganese (Mn), % | 0.6 to 1.0 | |
| 0 |
| Molybdenum (Mo), % | 0.15 to 0.3 | |
| 4.5 to 6.0 |
| Nickel (Ni), % | 0 | |
| 2.0 to 3.0 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 |
| Silicon (Si), % | 0 to 0.6 | |
| 0 to 1.5 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |