R30035 Cobalt vs. S20910 Stainless Steel
R30035 cobalt belongs to the cobalt alloys classification, while S20910 stainless steel belongs to the iron alloys. They have a modest 35% 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 R30035 cobalt and the bottom bar is S20910 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 to 230 | |
| 200 |
| Elongation at Break, % | 9.0 to 46 | |
| 14 to 39 |
| Fatigue Strength, MPa | 170 to 740 | |
| 310 to 460 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Reduction in Area, % | 40 to 74 | |
| 56 to 62 |
| Shear Modulus, GPa | 84 to 89 | |
| 79 |
| Tensile Strength: Ultimate (UTS), MPa | 900 to 1900 | |
| 780 to 940 |
| Tensile Strength: Yield (Proof), MPa | 300 to 1650 | |
| 430 to 810 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 300 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1420 |
| Melting Onset (Solidus), °C | 1320 | |
| 1380 |
| Specific Heat Capacity, J/kg-K | 440 | |
| 480 |
| Thermal Conductivity, W/m-K | 11 | |
| 13 |
| Thermal Expansion, µm/m-K | 13 | |
| 16 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 100 | |
| 22 |
| Density, g/cm3 | 8.7 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 10 | |
| 4.8 |
| Embodied Energy, MJ/kg | 140 | |
| 68 |
| Embodied Water, L/kg | 410 | |
| 180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 160 to 320 | |
| 120 to 260 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 210 to 5920 | |
| 460 to 1640 |
| Stiffness to Weight: Axial, points | 14 to 15 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 to 24 | |
| 25 |
| Strength to Weight: Axial, points | 29 to 61 | |
| 28 to 33 |
| Strength to Weight: Bending, points | 24 to 39 | |
| 24 to 27 |
| Thermal Diffusivity, mm2/s | 3.0 | |
| 3.6 |
| Thermal Shock Resistance, points | 23 to 46 | |
| 17 to 21 |
Alloy Composition
| Boron (B), % | 0 to 0.015 | |
| 0 |
| Carbon (C), % | 0 to 0.025 | |
| 0 to 0.060 |
| Chromium (Cr), % | 19 to 21 | |
| 20.5 to 23.5 |
| Cobalt (Co), % | 29.1 to 39 | |
| 0 |
| Iron (Fe), % | 0 to 1.0 | |
| 52.1 to 62.1 |
| Manganese (Mn), % | 0 to 0.15 | |
| 4.0 to 6.0 |
| Molybdenum (Mo), % | 9.0 to 10.5 | |
| 1.5 to 3.0 |
| Nickel (Ni), % | 33 to 37 | |
| 11.5 to 13.5 |
| Niobium (Nb), % | 0 | |
| 0.1 to 0.3 |
| Nitrogen (N), % | 0 | |
| 0.2 to 0.4 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.15 | |
| 0 to 0.75 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 to 1.0 | |
| 0 |
| Vanadium (V), % | 0 | |
| 0.1 to 0.3 |