SAE-AISI M42 Steel vs. R30035 Cobalt
SAE-AISI M42 steel belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. They have a modest 23% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 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 M42 steel and the bottom bar is R30035 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 220 to 230 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 78 | |
| 84 to 89 |
| Tensile Strength: Ultimate (UTS), MPa | 810 to 2310 | |
| 900 to 1900 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 320 |
| Melting Completion (Liquidus), °C | 1540 | |
| 1440 |
| Melting Onset (Solidus), °C | 1490 | |
| 1320 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 440 |
| Thermal Conductivity, W/m-K | 20 | |
| 11 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 30 | |
| 100 |
| Density, g/cm3 | 8.2 | |
| 8.7 |
| Embodied Carbon, kg CO2/kg material | 7.4 | |
| 10 |
| Embodied Energy, MJ/kg | 100 | |
| 140 |
| Embodied Water, L/kg | 140 | |
| 410 |
Common Calculations
| Stiffness to Weight: Axial, points | 14 | |
| 14 to 15 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 to 24 |
| Strength to Weight: Axial, points | 28 to 79 | |
| 29 to 61 |
| Strength to Weight: Bending, points | 24 to 48 | |
| 24 to 39 |
| Thermal Diffusivity, mm2/s | 5.4 | |
| 3.0 |
| Thermal Shock Resistance, points | 25 to 71 | |
| 23 to 46 |
Alloy Composition
| Boron (B), % | 0 | |
| 0 to 0.015 |
| Carbon (C), % | 1.1 to 1.2 | |
| 0 to 0.025 |
| Chromium (Cr), % | 3.5 to 4.3 | |
| 19 to 21 |
| Cobalt (Co), % | 7.8 to 8.8 | |
| 29.1 to 39 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 |
| Iron (Fe), % | 76.3 to 81 | |
| 0 to 1.0 |
| Manganese (Mn), % | 0.15 to 0.4 | |
| 0 to 0.15 |
| Molybdenum (Mo), % | 9.0 to 10 | |
| 9.0 to 10.5 |
| Nickel (Ni), % | 0 to 0.3 | |
| 33 to 37 |
| Phosphorus (P), % | 0 to 0.030 | |
| 0 to 0.015 |
| Silicon (Si), % | 0.15 to 0.65 | |
| 0 to 0.15 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.010 |
| Titanium (Ti), % | 0 | |
| 0 to 1.0 |
| Tungsten (W), % | 1.2 to 1.9 | |
| 0 |
| Vanadium (V), % | 1.0 to 1.4 | |
| 0 |