S45500 Stainless Steel vs. R30035 Cobalt
S45500 stainless steel belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. They have a modest 22% of their average alloy composition in common, which, by itself, doesn't mean much. There are 24 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.
For each property being compared, the top bar is S45500 stainless steel and the bottom bar is R30035 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 220 to 230 |
| Elongation at Break, % | 3.4 to 11 | |
| 9.0 to 46 |
| Fatigue Strength, MPa | 570 to 890 | |
| 170 to 740 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Reduction in Area, % | 34 to 45 | |
| 40 to 74 |
| Shear Modulus, GPa | 75 | |
| 84 to 89 |
| Tensile Strength: Ultimate (UTS), MPa | 1370 to 1850 | |
| 900 to 1900 |
| Tensile Strength: Yield (Proof), MPa | 1240 to 1700 | |
| 300 to 1650 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 320 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1440 |
| Melting Onset (Solidus), °C | 1400 | |
| 1320 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 440 |
| Thermal Expansion, µm/m-K | 11 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 17 | |
| 100 |
| Density, g/cm3 | 7.9 | |
| 8.7 |
| Embodied Carbon, kg CO2/kg material | 3.8 | |
| 10 |
| Embodied Energy, MJ/kg | 57 | |
| 140 |
| Embodied Water, L/kg | 120 | |
| 410 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 45 to 190 | |
| 160 to 320 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 to 15 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 to 24 |
| Strength to Weight: Axial, points | 48 to 65 | |
| 29 to 61 |
| Strength to Weight: Bending, points | 35 to 42 | |
| 24 to 39 |
| Thermal Shock Resistance, points | 48 to 64 | |
| 23 to 46 |
Alloy Composition
| Boron (B), % | 0 | |
| 0 to 0.015 |
| Carbon (C), % | 0 to 0.050 | |
| 0 to 0.025 |
| Chromium (Cr), % | 11 to 12.5 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 29.1 to 39 |
| Copper (Cu), % | 1.5 to 2.5 | |
| 0 |
| Iron (Fe), % | 71.5 to 79.2 | |
| 0 to 1.0 |
| Manganese (Mn), % | 0 to 0.5 | |
| 0 to 0.15 |
| Molybdenum (Mo), % | 0 to 0.5 | |
| 9.0 to 10.5 |
| Nickel (Ni), % | 7.5 to 9.5 | |
| 33 to 37 |
| Niobium (Nb), % | 0 to 0.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 0.5 | |
| 0 to 0.15 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.010 |
| Tantalum (Ta), % | 0 to 0.5 | |
| 0 |
| Titanium (Ti), % | 0.8 to 1.4 | |
| 0 to 1.0 |