R30816 Cobalt vs. EN 1.5538 Steel
R30816 cobalt belongs to the cobalt alloys classification, while EN 1.5538 steel belongs to the iron alloys. There are 22 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.
For each property being compared, the top bar is R30816 cobalt and the bottom bar is EN 1.5538 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 280 | |
| 160 to 190 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Poisson's Ratio | 0.3 | |
| 0.29 |
| Reduction in Area, % | 22 | |
| 64 to 69 |
| Shear Modulus, GPa | 81 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 530 to 1810 |
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 | |
| 51 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
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 | |
| 48 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 22 | |
| 24 |
| Strength to Weight: Axial, points | 31 | |
| 19 to 64 |
| Strength to Weight: Bending, points | 25 | |
| 19 to 42 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 14 |
| Thermal Shock Resistance, points | 28 | |
| 16 to 53 |
Alloy Composition
| Boron (B), % | 0 | |
| 0.00080 to 0.0050 |
| Carbon (C), % | 0.32 to 0.42 | |
| 0.35 to 0.4 |
| Chromium (Cr), % | 19 to 21 | |
| 0 to 0.3 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0 to 0.25 |
| Iron (Fe), % | 0 to 5.0 | |
| 97.2 to 98.5 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 1.2 to 1.5 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 0 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.3 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.025 |
| Tantalum (Ta), % | 3.5 to 4.5 | |
| 0 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |