R30816 Cobalt vs. EN 1.4618 Stainless Steel
R30816 cobalt belongs to the cobalt alloys classification, while EN 1.4618 stainless steel belongs to the iron alloys. They have a modest 27% 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 1.4618 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 280 | |
| 200 to 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Elongation at Break, % | 23 | |
| 51 |
| Fatigue Strength, MPa | 250 | |
| 240 to 250 |
| Poisson's Ratio | 0.3 | |
| 0.28 |
| Shear Modulus, GPa | 81 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 680 to 700 |
| Tensile Strength: Yield (Proof), MPa | 460 | |
| 250 to 260 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 280 |
| Melting Completion (Liquidus), °C | 1540 | |
| 1400 |
| Melting Onset (Solidus), °C | 1460 | |
| 1360 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 480 |
| Thermal Conductivity, W/m-K | 13 | |
| 15 |
| Thermal Expansion, µm/m-K | 12 | |
| 16 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 7.7 |
| 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 | |
| 270 to 280 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 | |
| 160 to 170 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 22 | |
| 25 |
| Strength to Weight: Axial, points | 31 | |
| 24 to 25 |
| Strength to Weight: Bending, points | 25 | |
| 22 to 23 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 4.0 |
| Thermal Shock Resistance, points | 28 | |
| 15 to 16 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.42 | |
| 0 to 0.1 |
| Chromium (Cr), % | 19 to 21 | |
| 16.5 to 18.5 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Copper (Cu), % | 0 | |
| 1.0 to 2.5 |
| Iron (Fe), % | 0 to 5.0 | |
| 62.7 to 72.5 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 5.5 to 9.5 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 4.5 to 5.5 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.15 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.070 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.010 |
| Tantalum (Ta), % | 3.5 to 4.5 | |
| 0 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |