R30816 Cobalt vs. EN 1.6771 Steel
R30816 cobalt belongs to the cobalt alloys classification, while EN 1.6771 steel belongs to the iron alloys. There are 26 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 R30816 cobalt and the bottom bar is EN 1.6771 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 280 | |
| 280 to 350 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 23 | |
| 8.0 to 8.7 |
| Fatigue Strength, MPa | 250 | |
| 440 to 680 |
| Poisson's Ratio | 0.3 | |
| 0.29 |
| Shear Modulus, GPa | 81 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 930 to 1180 |
| Tensile Strength: Yield (Proof), MPa | 460 | |
| 740 to 1140 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 250 |
| Melting Completion (Liquidus), °C | 1540 | |
| 1460 |
| Melting Onset (Solidus), °C | 1460 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 470 |
| Thermal Conductivity, W/m-K | 13 | |
| 46 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 20 | |
| 1.9 |
| Embodied Energy, MJ/kg | 320 | |
| 25 |
| Embodied Water, L/kg | 440 | |
| 58 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 190 | |
| 75 to 93 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 | |
| 1460 to 3450 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 22 | |
| 24 |
| Strength to Weight: Axial, points | 31 | |
| 33 to 41 |
| Strength to Weight: Bending, points | 25 | |
| 27 to 31 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 13 |
| Thermal Shock Resistance, points | 28 | |
| 27 to 35 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.42 | |
| 0.27 to 0.33 |
| Chromium (Cr), % | 19 to 21 | |
| 0.8 to 1.2 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Iron (Fe), % | 0 to 5.0 | |
| 92.2 to 95 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0.6 to 1.0 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0.3 to 0.6 |
| Nickel (Ni), % | 19 to 21 | |
| 3.0 to 4.0 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.6 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.020 |
| Tantalum (Ta), % | 3.5 to 4.5 | |
| 0 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |