R30816 Cobalt vs. EN 1.1191 Steel
R30816 cobalt belongs to the cobalt alloys classification, while EN 1.1191 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 1.1191 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 280 | |
| 180 to 200 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 23 | |
| 16 to 17 |
| Fatigue Strength, MPa | 250 | |
| 210 to 290 |
| Poisson's Ratio | 0.3 | |
| 0.29 |
| Shear Modulus, GPa | 81 | |
| 72 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 630 to 700 |
| Tensile Strength: Yield (Proof), MPa | 460 | |
| 310 to 440 |
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 | |
| 48 |
| Thermal Expansion, µm/m-K | 12 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 20 | |
| 1.4 |
| Embodied Energy, MJ/kg | 320 | |
| 19 |
| Embodied Water, L/kg | 440 | |
| 47 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 190 | |
| 83 to 100 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 | |
| 260 to 510 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 22 | |
| 24 |
| Strength to Weight: Axial, points | 31 | |
| 22 to 25 |
| Strength to Weight: Bending, points | 25 | |
| 21 to 22 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 13 |
| Thermal Shock Resistance, points | 28 | |
| 20 to 22 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.42 | |
| 0.42 to 0.5 |
| Chromium (Cr), % | 19 to 21 | |
| 0 to 0.4 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Iron (Fe), % | 0 to 5.0 | |
| 97.3 to 99.08 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0.5 to 0.8 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0 to 0.1 |
| Nickel (Ni), % | 19 to 21 | |
| 0 to 0.4 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.4 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.035 |
| Tantalum (Ta), % | 3.5 to 4.5 | |
| 0 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |