EN 1.7231 Steel vs. R30816 Cobalt
EN 1.7231 steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 26 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 R30816 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 240 to 280 | |
| 280 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 |
| Elongation at Break, % | 11 to 12 | |
| 23 |
| Fatigue Strength, MPa | 360 to 500 | |
| 250 |
| Poisson's Ratio | 0.29 | |
| 0.3 |
| Shear Modulus, GPa | 73 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 790 to 930 | |
| 1020 |
| Tensile Strength: Yield (Proof), MPa | 570 to 800 | |
| 460 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 300 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1540 |
| Melting Onset (Solidus), °C | 1420 | |
| 1460 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 420 |
| Thermal Conductivity, W/m-K | 46 | |
| 13 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.8 | |
| 9.1 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 20 |
| Embodied Energy, MJ/kg | 20 | |
| 320 |
| Embodied Water, L/kg | 51 | |
| 440 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 87 to 100 | |
| 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 870 to 1700 | |
| 510 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 22 |
| Strength to Weight: Axial, points | 28 to 33 | |
| 31 |
| Strength to Weight: Bending, points | 24 to 27 | |
| 25 |
| Thermal Diffusivity, mm2/s | 12 | |
| 3.3 |
| Thermal Shock Resistance, points | 23 to 27 | |
| 28 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.45 | |
| 0.32 to 0.42 |
| Chromium (Cr), % | 0.8 to 1.2 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 40 to 49.8 |
| Iron (Fe), % | 96.4 to 98.1 | |
| 0 to 5.0 |
| Manganese (Mn), % | 0.6 to 1.0 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0.15 to 0.3 | |
| 3.5 to 4.5 |
| Nickel (Ni), % | 0 | |
| 19 to 21 |
| Niobium (Nb), % | 0 | |
| 3.5 to 4.5 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.6 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 0 | |
| 3.5 to 4.5 |
| Tungsten (W), % | 0 | |
| 3.5 to 4.5 |