R30021 Cobalt vs. S66286 Stainless Steel
R30021 cobalt belongs to the cobalt alloys classification, while S66286 stainless steel belongs to the iron alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is R30021 cobalt and the bottom bar is S66286 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 190 |
| Elongation at Break, % | 9.0 | |
| 17 to 40 |
| Fatigue Strength, MPa | 250 | |
| 240 to 410 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 86 | |
| 75 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 620 to 1020 |
| Tensile Strength: Yield (Proof), MPa | 500 | |
| 280 to 670 |
Thermal Properties
| Latent Heat of Fusion, J/g | 330 | |
| 300 |
| Melting Completion (Liquidus), °C | 1350 | |
| 1430 |
| Melting Onset (Solidus), °C | 1190 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 15 | |
| 15 |
| Thermal Expansion, µm/m-K | 11 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.9 | |
| 1.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 2.2 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 6.0 |
| Embodied Energy, MJ/kg | 110 | |
| 87 |
| Embodied Water, L/kg | 520 | |
| 170 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 57 | |
| 150 to 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 570 | |
| 190 to 1150 |
| Stiffness to Weight: Axial, points | 15 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 23 | |
| 22 to 36 |
| Strength to Weight: Bending, points | 21 | |
| 20 to 28 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 4.0 |
| Thermal Shock Resistance, points | 21 | |
| 13 to 22 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.35 |
| Boron (B), % | 0 | |
| 0.0010 to 0.010 |
| Carbon (C), % | 0.2 to 0.35 | |
| 0 to 0.080 |
| Chromium (Cr), % | 26 to 29 | |
| 13.5 to 16 |
| Cobalt (Co), % | 61.7 to 67.3 | |
| 0 |
| Iron (Fe), % | 0 to 3.0 | |
| 49.1 to 59.5 |
| Manganese (Mn), % | 0 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 4.5 to 6.0 | |
| 1.0 to 1.5 |
| Nickel (Ni), % | 2.0 to 3.0 | |
| 24 to 27 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.5 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 | |
| 1.9 to 2.4 |
| Vanadium (V), % | 0 | |
| 0.1 to 0.5 |