R30816 Cobalt vs. EN 1.4740 Stainless Steel
R30816 cobalt belongs to the cobalt alloys classification, while EN 1.4740 stainless steel belongs to the iron alloys. They have a modest 22% of their average alloy composition in common, which, by itself, doesn't mean much. There are 18 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.
For each property being compared, the top bar is R30816 cobalt and the bottom bar is EN 1.4740 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 280 | |
| 260 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Elongation at Break, % | 23 | |
| 22 |
| Poisson's Ratio | 0.3 | |
| 0.28 |
| Shear Modulus, GPa | 81 | |
| 77 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 300 |
| Melting Completion (Liquidus), °C | 1540 | |
| 1420 |
| Melting Onset (Solidus), °C | 1460 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 490 |
| Thermal Conductivity, W/m-K | 13 | |
| 18 |
| Thermal Expansion, µm/m-K | 12 | |
| 10 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 7.6 |
| Embodied Carbon, kg CO2/kg material | 20 | |
| 2.3 |
| Embodied Energy, MJ/kg | 320 | |
| 32 |
| Embodied Water, L/kg | 440 | |
| 120 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 22 | |
| 25 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 4.8 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.42 | |
| 0.3 to 0.5 |
| Chromium (Cr), % | 19 to 21 | |
| 16 to 19 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Iron (Fe), % | 0 to 5.0 | |
| 75.4 to 82.7 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0 to 0.5 |
| Nickel (Ni), % | 19 to 21 | |
| 0 to 1.0 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.0 | |
| 1.0 to 2.5 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 3.5 to 4.5 | |
| 0 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |