R30021 Cobalt vs. S36200 Stainless Steel
R30021 cobalt belongs to the cobalt alloys classification, while S36200 stainless steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is R30021 cobalt and the bottom bar is S36200 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 190 |
| Elongation at Break, % | 9.0 | |
| 3.4 to 4.6 |
| Fatigue Strength, MPa | 250 | |
| 450 to 570 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Rockwell C Hardness | 32 | |
| 25 to 33 |
| Shear Modulus, GPa | 86 | |
| 76 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 1180 to 1410 |
| Tensile Strength: Yield (Proof), MPa | 500 | |
| 960 to 1240 |
Thermal Properties
| Latent Heat of Fusion, J/g | 330 | |
| 280 |
| Melting Completion (Liquidus), °C | 1350 | |
| 1440 |
| Melting Onset (Solidus), °C | 1190 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 480 |
| Thermal Conductivity, W/m-K | 15 | |
| 16 |
| Thermal Expansion, µm/m-K | 11 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.9 | |
| 2.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 2.6 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 2.8 |
| Embodied Energy, MJ/kg | 110 | |
| 40 |
| Embodied Water, L/kg | 520 | |
| 120 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 57 | |
| 46 to 51 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 570 | |
| 2380 to 3930 |
| Stiffness to Weight: Axial, points | 15 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 23 | |
| 42 to 50 |
| Strength to Weight: Bending, points | 21 | |
| 32 to 36 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 4.3 |
| Thermal Shock Resistance, points | 21 | |
| 40 to 48 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.1 |
| Carbon (C), % | 0.2 to 0.35 | |
| 0 to 0.050 |
| Chromium (Cr), % | 26 to 29 | |
| 14 to 14.5 |
| Cobalt (Co), % | 61.7 to 67.3 | |
| 0 |
| Iron (Fe), % | 0 to 3.0 | |
| 75.4 to 79.5 |
| Manganese (Mn), % | 0 | |
| 0 to 0.5 |
| Molybdenum (Mo), % | 4.5 to 6.0 | |
| 0 to 0.3 |
| Nickel (Ni), % | 2.0 to 3.0 | |
| 6.5 to 7.0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 1.5 | |
| 0 to 0.3 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 | |
| 0.6 to 0.9 |