S45500 Stainless Steel vs. R31233 Cobalt
S45500 stainless steel belongs to the iron alloys classification, while R31233 cobalt belongs to the cobalt alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 22 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.
For each property being compared, the top bar is S45500 stainless steel and the bottom bar is R31233 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 220 |
| Elongation at Break, % | 3.4 to 11 | |
| 17 |
| Fatigue Strength, MPa | 570 to 890 | |
| 220 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 75 | |
| 85 |
| Tensile Strength: Ultimate (UTS), MPa | 1370 to 1850 | |
| 1020 |
| Tensile Strength: Yield (Proof), MPa | 1240 to 1700 | |
| 420 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 320 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1350 |
| Melting Onset (Solidus), °C | 1400 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 440 |
| Thermal Expansion, µm/m-K | 11 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.9 | |
| 8.6 |
| Embodied Carbon, kg CO2/kg material | 3.8 | |
| 8.4 |
| Embodied Energy, MJ/kg | 57 | |
| 110 |
| Embodied Water, L/kg | 120 | |
| 480 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 45 to 190 | |
| 140 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 |
| Strength to Weight: Axial, points | 48 to 65 | |
| 33 |
| Strength to Weight: Bending, points | 35 to 42 | |
| 26 |
| Thermal Shock Resistance, points | 48 to 64 | |
| 25 |
Alloy Composition
| Boron (B), % | 0 | |
| 0 to 0.015 |
| Carbon (C), % | 0 to 0.050 | |
| 0.020 to 0.1 |
| Chromium (Cr), % | 11 to 12.5 | |
| 23.5 to 27.5 |
| Cobalt (Co), % | 0 | |
| 44.7 to 63.3 |
| Copper (Cu), % | 1.5 to 2.5 | |
| 0 |
| Iron (Fe), % | 71.5 to 79.2 | |
| 1.0 to 5.0 |
| Manganese (Mn), % | 0 to 0.5 | |
| 0.1 to 1.5 |
| Molybdenum (Mo), % | 0 to 0.5 | |
| 4.0 to 6.0 |
| Nickel (Ni), % | 7.5 to 9.5 | |
| 7.0 to 11 |
| Niobium (Nb), % | 0 to 0.5 | |
| 0 |
| Nitrogen (N), % | 0 | |
| 0.030 to 0.12 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 0.5 | |
| 0.050 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.020 |
| Tantalum (Ta), % | 0 to 0.5 | |
| 0 |
| Titanium (Ti), % | 0.8 to 1.4 | |
| 0 |
| Tungsten (W), % | 0 | |
| 1.0 to 3.0 |