R30035 Cobalt vs. S17400 Stainless Steel
R30035 cobalt belongs to the cobalt alloys classification, while S17400 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 29 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 S17400 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 to 230 | |
| 190 |
| Elongation at Break, % | 9.0 to 46 | |
| 11 to 21 |
| Fatigue Strength, MPa | 170 to 740 | |
| 380 to 670 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Reduction in Area, % | 40 to 74 | |
| 40 to 62 |
| Shear Modulus, GPa | 84 to 89 | |
| 75 |
| Tensile Strength: Ultimate (UTS), MPa | 900 to 1900 | |
| 910 to 1390 |
| Tensile Strength: Yield (Proof), MPa | 300 to 1650 | |
| 580 to 1250 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 280 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1440 |
| Melting Onset (Solidus), °C | 1320 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 440 | |
| 480 |
| Thermal Conductivity, W/m-K | 11 | |
| 17 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.7 | |
| 2.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 1.8 | |
| 2.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 100 | |
| 14 |
| Density, g/cm3 | 8.7 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 10 | |
| 2.7 |
| Embodied Energy, MJ/kg | 140 | |
| 39 |
| Embodied Water, L/kg | 410 | |
| 130 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 160 to 320 | |
| 140 to 160 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 210 to 5920 | |
| 880 to 4060 |
| 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 | |
| 32 to 49 |
| Strength to Weight: Bending, points | 24 to 39 | |
| 27 to 35 |
| Thermal Diffusivity, mm2/s | 3.0 | |
| 4.5 |
| Thermal Shock Resistance, points | 23 to 46 | |
| 30 to 46 |
Alloy Composition
| Boron (B), % | 0 to 0.015 | |
| 0 |
| Carbon (C), % | 0 to 0.025 | |
| 0 to 0.070 |
| Chromium (Cr), % | 19 to 21 | |
| 15 to 17 |
| Cobalt (Co), % | 29.1 to 39 | |
| 0 |
| Copper (Cu), % | 0 | |
| 3.0 to 5.0 |
| Iron (Fe), % | 0 to 1.0 | |
| 70.4 to 78.9 |
| Manganese (Mn), % | 0 to 0.15 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 9.0 to 10.5 | |
| 0 |
| Nickel (Ni), % | 33 to 37 | |
| 3.0 to 5.0 |
| Niobium (Nb), % | 0 | |
| 0.15 to 0.45 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.15 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 to 1.0 | |
| 0 |