SAE-AISI S6 Steel vs. R30008 Cobalt
SAE-AISI S6 steel belongs to the iron alloys classification, while R30008 cobalt belongs to the cobalt alloys. There are 19 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 SAE-AISI S6 steel and the bottom bar is R30008 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 72 | |
| 83 |
| Tensile Strength: Ultimate (UTS), MPa | 670 to 1920 | |
| 950 to 1700 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 320 |
| Melting Completion (Liquidus), °C | 1430 | |
| 1400 |
| Melting Onset (Solidus), °C | 1390 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 450 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.2 | |
| 95 |
| Density, g/cm3 | 7.7 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 2.3 | |
| 8.1 |
| Embodied Energy, MJ/kg | 33 | |
| 110 |
| Embodied Water, L/kg | 56 | |
| 400 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 24 to 70 | |
| 31 to 56 |
| Strength to Weight: Bending, points | 22 to 45 | |
| 25 to 37 |
| Thermal Shock Resistance, points | 22 to 64 | |
| 25 to 44 |
Alloy Composition
| Boron (B), % | 0 | |
| 0 to 0.0010 |
| Carbon (C), % | 0.4 to 0.5 | |
| 0 to 0.15 |
| Chromium (Cr), % | 1.2 to 1.5 | |
| 18.5 to 21.5 |
| Cobalt (Co), % | 0 | |
| 39 to 42 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 |
| Iron (Fe), % | 92.8 to 94.7 | |
| 7.6 to 20 |
| Manganese (Mn), % | 1.2 to 1.5 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0.3 to 0.5 | |
| 6.5 to 7.5 |
| Nickel (Ni), % | 0 | |
| 15 to 18 |
| Phosphorus (P), % | 0 to 0.030 | |
| 0 to 0.015 |
| Silicon (Si), % | 2.0 to 2.5 | |
| 0 to 1.2 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.015 |
| Vanadium (V), % | 0.2 to 0.4 | |
| 0 |