R30816 Cobalt vs. EN 1.4378 Stainless Steel
R30816 cobalt belongs to the cobalt alloys classification, while EN 1.4378 stainless steel belongs to the iron alloys. They have a modest 26% of their average alloy composition in common, which, by itself, doesn't mean much. There are 24 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is R30816 cobalt and the bottom bar is EN 1.4378 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 280 | |
| 190 to 340 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Elongation at Break, % | 23 | |
| 14 to 34 |
| Fatigue Strength, MPa | 250 | |
| 340 to 550 |
| Poisson's Ratio | 0.3 | |
| 0.28 |
| Shear Modulus, GPa | 81 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 760 to 1130 |
| Tensile Strength: Yield (Proof), MPa | 460 | |
| 430 to 970 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 290 |
| Melting Completion (Liquidus), °C | 1540 | |
| 1390 |
| Melting Onset (Solidus), °C | 1460 | |
| 1350 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 480 |
| Thermal Expansion, µm/m-K | 12 | |
| 17 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 7.6 |
| Embodied Carbon, kg CO2/kg material | 20 | |
| 2.7 |
| Embodied Energy, MJ/kg | 320 | |
| 39 |
| Embodied Water, L/kg | 440 | |
| 150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 190 | |
| 150 to 220 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 | |
| 470 to 2370 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 22 | |
| 25 |
| Strength to Weight: Axial, points | 31 | |
| 28 to 41 |
| Strength to Weight: Bending, points | 25 | |
| 24 to 31 |
| Thermal Shock Resistance, points | 28 | |
| 16 to 23 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.42 | |
| 0 to 0.080 |
| Chromium (Cr), % | 19 to 21 | |
| 17 to 19 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Iron (Fe), % | 0 to 5.0 | |
| 61.2 to 69 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 11.5 to 14.5 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 2.3 to 3.7 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 |
| Nitrogen (N), % | 0 | |
| 0.2 to 0.4 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.060 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| 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 |