R30816 Cobalt vs. EN 1.4057 Stainless Steel
R30816 cobalt belongs to the cobalt alloys classification, while EN 1.4057 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 25 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.
For each property being compared, the top bar is R30816 cobalt and the bottom bar is EN 1.4057 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Elongation at Break, % | 23 | |
| 11 to 17 |
| Fatigue Strength, MPa | 250 | |
| 320 to 430 |
| Poisson's Ratio | 0.3 | |
| 0.28 |
| Shear Modulus, GPa | 81 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 840 to 980 |
| Tensile Strength: Yield (Proof), MPa | 460 | |
| 530 to 790 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 280 |
| Melting Completion (Liquidus), °C | 1540 | |
| 1440 |
| Melting Onset (Solidus), °C | 1460 | |
| 1390 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 480 |
| Thermal Conductivity, W/m-K | 13 | |
| 25 |
| Thermal Expansion, µm/m-K | 12 | |
| 10 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 20 | |
| 2.2 |
| Embodied Energy, MJ/kg | 320 | |
| 32 |
| Embodied Water, L/kg | 440 | |
| 120 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 190 | |
| 96 to 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 | |
| 700 to 1610 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 22 | |
| 25 |
| Strength to Weight: Axial, points | 31 | |
| 30 to 35 |
| Strength to Weight: Bending, points | 25 | |
| 26 to 28 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 6.7 |
| Thermal Shock Resistance, points | 28 | |
| 30 to 35 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.42 | |
| 0.12 to 0.22 |
| Chromium (Cr), % | 19 to 21 | |
| 15 to 17 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Iron (Fe), % | 0 to 5.0 | |
| 77.7 to 83.4 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 1.5 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 1.5 to 2.5 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.015 |
| Tantalum (Ta), % | 3.5 to 4.5 | |
| 0 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |