R30816 Cobalt vs. EN 1.4424 Stainless Steel
R30816 cobalt belongs to the cobalt alloys classification, while EN 1.4424 stainless steel belongs to the iron alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 26 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 1.4424 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 280 | |
| 230 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Elongation at Break, % | 23 | |
| 28 |
| Fatigue Strength, MPa | 250 | |
| 350 to 370 |
| Poisson's Ratio | 0.3 | |
| 0.28 |
| Shear Modulus, GPa | 81 | |
| 78 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 800 |
| Tensile Strength: Yield (Proof), MPa | 460 | |
| 480 to 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 310 |
| Melting Completion (Liquidus), °C | 1540 | |
| 1430 |
| Melting Onset (Solidus), °C | 1460 | |
| 1390 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 480 |
| Thermal Conductivity, W/m-K | 13 | |
| 13 |
| Thermal Expansion, µm/m-K | 12 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 20 | |
| 3.4 |
| Embodied Energy, MJ/kg | 320 | |
| 46 |
| Embodied Water, L/kg | 440 | |
| 140 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 190 | |
| 190 to 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 | |
| 580 to 640 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 22 | |
| 25 |
| Strength to Weight: Axial, points | 31 | |
| 29 |
| Strength to Weight: Bending, points | 25 | |
| 25 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 3.5 |
| Thermal Shock Resistance, points | 28 | |
| 23 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.42 | |
| 0 to 0.030 |
| Chromium (Cr), % | 19 to 21 | |
| 18 to 19 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Iron (Fe), % | 0 to 5.0 | |
| 68.6 to 72.4 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 1.2 to 2.0 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 2.5 to 3.0 |
| Nickel (Ni), % | 19 to 21 | |
| 4.5 to 5.2 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 |
| Nitrogen (N), % | 0 | |
| 0.050 to 0.1 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 1.0 | |
| 1.4 to 2.0 |
| 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 |