EN 1.7709 Steel vs. R30155 Cobalt
Both EN 1.7709 steel and R30155 cobalt are iron alloys. They have a modest 34% 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 (10, in this case) are not shown.
For each property being compared, the top bar is EN 1.7709 steel and the bottom bar is R30155 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 to 230 | |
| 220 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 650 to 780 | |
| 850 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 300 |
| Maximum Temperature: Mechanical, °C | 440 | |
| 1100 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1470 |
| Melting Onset (Solidus), °C | 1420 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 450 |
| Thermal Conductivity, W/m-K | 33 | |
| 12 |
| Thermal Expansion, µm/m-K | 11 | |
| 14 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.4 | |
| 80 |
| Density, g/cm3 | 7.8 | |
| 8.5 |
| Embodied Carbon, kg CO2/kg material | 2.3 | |
| 9.7 |
| Embodied Energy, MJ/kg | 32 | |
| 150 |
| Embodied Water, L/kg | 56 | |
| 300 |
Common Calculations
| PREN (Pitting Resistance) | 3.6 | |
| 37 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 |
| Strength to Weight: Axial, points | 23 to 27 | |
| 28 |
| Strength to Weight: Bending, points | 21 to 24 | |
| 24 |
| Thermal Diffusivity, mm2/s | 8.9 | |
| 3.2 |
| Thermal Shock Resistance, points | 22 to 26 | |
| 21 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.030 | |
| 0 |
| Carbon (C), % | 0.17 to 0.25 | |
| 0.080 to 0.16 |
| Chromium (Cr), % | 1.2 to 1.5 | |
| 20 to 22.5 |
| Cobalt (Co), % | 0 | |
| 18.5 to 21 |
| Iron (Fe), % | 95.2 to 97.5 | |
| 24.3 to 36.2 |
| Manganese (Mn), % | 0.4 to 0.8 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0.55 to 0.8 | |
| 2.5 to 3.5 |
| Nickel (Ni), % | 0 to 0.6 | |
| 19 to 21 |
| Niobium (Nb), % | 0 | |
| 0.75 to 1.3 |
| Nitrogen (N), % | 0 | |
| 0 to 0.2 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.4 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 0 | |
| 0.75 to 1.3 |
| Tungsten (W), % | 0 | |
| 2.0 to 3.0 |
| Vanadium (V), % | 0.2 to 0.35 | |
| 0 |