R30021 Cobalt vs. S35500 Stainless Steel
R30021 cobalt belongs to the cobalt alloys classification, while S35500 stainless steel belongs to the iron alloys. They have a modest 23% of their average alloy composition in common, which, by itself, doesn't mean much. 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 S35500 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 200 |
| Elongation at Break, % | 9.0 | |
| 14 |
| Fatigue Strength, MPa | 250 | |
| 690 to 730 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Rockwell C Hardness | 32 | |
| 33 to 42 |
| Shear Modulus, GPa | 86 | |
| 78 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 1330 to 1490 |
| Tensile Strength: Yield (Proof), MPa | 500 | |
| 1200 to 1280 |
Thermal Properties
| Latent Heat of Fusion, J/g | 330 | |
| 280 |
| Melting Completion (Liquidus), °C | 1350 | |
| 1460 |
| Melting Onset (Solidus), °C | 1190 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 15 | |
| 16 |
| Thermal Expansion, µm/m-K | 11 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.9 | |
| 2.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 2.5 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 3.5 |
| Embodied Energy, MJ/kg | 110 | |
| 47 |
| Embodied Water, L/kg | 520 | |
| 130 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 57 | |
| 180 to 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 570 | |
| 3610 to 4100 |
| Stiffness to Weight: Axial, points | 15 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 23 | |
| 47 to 53 |
| Strength to Weight: Bending, points | 21 | |
| 34 to 37 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 4.4 |
| Thermal Shock Resistance, points | 21 | |
| 44 to 49 |
Alloy Composition
| Carbon (C), % | 0.2 to 0.35 | |
| 0.1 to 0.15 |
| Chromium (Cr), % | 26 to 29 | |
| 15 to 16 |
| Cobalt (Co), % | 61.7 to 67.3 | |
| 0 |
| Iron (Fe), % | 0 to 3.0 | |
| 73.2 to 77.7 |
| Manganese (Mn), % | 0 | |
| 0.5 to 1.3 |
| Molybdenum (Mo), % | 4.5 to 6.0 | |
| 2.5 to 3.2 |
| Nickel (Ni), % | 2.0 to 3.0 | |
| 4.0 to 5.0 |
| Niobium (Nb), % | 0 | |
| 0.1 to 0.5 |
| Nitrogen (N), % | 0 | |
| 0.070 to 0.13 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.5 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |