EN 1.4740 Stainless Steel vs. R30016 Cobalt
EN 1.4740 stainless steel belongs to the iron alloys classification, while R30016 cobalt belongs to the cobalt alloys. They have a modest 22% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 material properties with values for both materials. Properties with values for just one material (18, in this case) are not shown.
For each property being compared, the top bar is EN 1.4740 stainless steel and the bottom bar is R30016 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 220 |
| Elongation at Break, % | 22 | |
| 8.4 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 77 | |
| 85 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 320 |
| Melting Completion (Liquidus), °C | 1420 | |
| 1360 |
| Melting Onset (Solidus), °C | 1370 | |
| 1270 |
| Specific Heat Capacity, J/kg-K | 490 | |
| 450 |
| Thermal Conductivity, W/m-K | 18 | |
| 15 |
| Thermal Expansion, µm/m-K | 10 | |
| 14 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.2 | |
| 1.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.6 | |
| 2.0 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.6 | |
| 8.5 |
| Embodied Carbon, kg CO2/kg material | 2.3 | |
| 7.7 |
| Embodied Energy, MJ/kg | 32 | |
| 110 |
| Embodied Water, L/kg | 120 | |
| 500 |
Common Calculations
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Thermal Diffusivity, mm2/s | 4.8 | |
| 3.9 |
Alloy Composition
| Carbon (C), % | 0.3 to 0.5 | |
| 0.9 to 1.4 |
| Chromium (Cr), % | 16 to 19 | |
| 28 to 32 |
| Cobalt (Co), % | 0 | |
| 49.6 to 66.9 |
| Iron (Fe), % | 75.4 to 82.7 | |
| 0 to 3.0 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.5 to 2.0 |
| Molybdenum (Mo), % | 0 to 0.5 | |
| 0 to 1.5 |
| Nickel (Ni), % | 0 to 1.0 | |
| 0 to 3.0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 |
| Silicon (Si), % | 1.0 to 2.5 | |
| 0.2 to 2.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |
| Tungsten (W), % | 0 | |
| 3.5 to 5.5 |