R30008 Cobalt vs. EN 1.4122 Stainless Steel
R30008 cobalt belongs to the cobalt alloys classification, while EN 1.4122 stainless steel belongs to the iron alloys. They have a modest 33% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.
For each property being compared, the top bar is R30008 cobalt and the bottom bar is EN 1.4122 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Elongation at Break, % | 1.1 to 73 | |
| 14 |
| Fatigue Strength, MPa | 320 to 530 | |
| 260 to 360 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 83 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 950 to 1700 | |
| 790 to 850 |
| Tensile Strength: Yield (Proof), MPa | 500 to 1080 | |
| 450 to 630 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 280 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1440 |
| Melting Onset (Solidus), °C | 1330 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 480 |
| Thermal Expansion, µm/m-K | 13 | |
| 10 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 95 | |
| 9.5 |
| Density, g/cm3 | 8.4 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 2.4 |
| Embodied Energy, MJ/kg | 110 | |
| 33 |
| Embodied Water, L/kg | 400 | |
| 120 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 590 to 2720 | |
| 520 to 1000 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 31 to 56 | |
| 28 to 31 |
| Strength to Weight: Bending, points | 25 to 37 | |
| 25 to 26 |
| Thermal Shock Resistance, points | 25 to 44 | |
| 28 to 30 |
Alloy Composition
| Boron (B), % | 0 to 0.0010 | |
| 0 |
| Carbon (C), % | 0 to 0.15 | |
| 0.33 to 0.45 |
| Chromium (Cr), % | 18.5 to 21.5 | |
| 15.5 to 17.5 |
| Cobalt (Co), % | 39 to 42 | |
| 0 |
| Iron (Fe), % | 7.6 to 20 | |
| 77.2 to 83.4 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 1.5 |
| Molybdenum (Mo), % | 6.5 to 7.5 | |
| 0.8 to 1.3 |
| Nickel (Ni), % | 15 to 18 | |
| 0 to 1.0 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.2 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.015 |