S21800 Stainless Steel vs. R30003 Cobalt
S21800 stainless steel belongs to the iron alloys classification, while R30003 cobalt belongs to the cobalt alloys. They have 43% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.
For each property being compared, the top bar is S21800 stainless steel and the bottom bar is R30003 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 |
| Elongation at Break, % | 40 | |
| 10 to 73 |
| Fatigue Strength, MPa | 330 | |
| 320 to 560 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 75 | |
| 83 |
| Tensile Strength: Ultimate (UTS), MPa | 740 | |
| 970 to 1720 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 510 to 1090 |
Thermal Properties
| Latent Heat of Fusion, J/g | 340 | |
| 310 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1400 |
| Melting Onset (Solidus), °C | 1310 | |
| 1440 |
| Specific Heat Capacity, J/kg-K | 500 | |
| 450 |
| Thermal Expansion, µm/m-K | 16 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 15 | |
| 95 |
| Density, g/cm3 | 7.5 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 3.1 | |
| 8.0 |
| Embodied Energy, MJ/kg | 45 | |
| 110 |
| Embodied Water, L/kg | 150 | |
| 400 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 390 | |
| 600 to 2790 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 26 | |
| 24 |
| Strength to Weight: Axial, points | 27 | |
| 32 to 57 |
| Strength to Weight: Bending, points | 24 | |
| 26 to 38 |
| Thermal Shock Resistance, points | 17 | |
| 26 to 45 |
Alloy Composition
| Boron (B), % | 0 | |
| 0 to 0.1 |
| Carbon (C), % | 0 to 0.1 | |
| 0 to 0.15 |
| Chromium (Cr), % | 16 to 18 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 39 to 41 |
| Iron (Fe), % | 59.1 to 65.4 | |
| 10 to 20.5 |
| Manganese (Mn), % | 7.0 to 9.0 | |
| 1.5 to 2.5 |
| Molybdenum (Mo), % | 0 | |
| 6.0 to 8.0 |
| Nickel (Ni), % | 8.0 to 9.0 | |
| 14 to 16 |
| Nitrogen (N), % | 0.080 to 0.18 | |
| 0 |
| Phosphorus (P), % | 0 to 0.060 | |
| 0 to 0.015 |
| Silicon (Si), % | 3.5 to 4.5 | |
| 0 to 1.2 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.015 |