EN 1.7710 Steel vs. R30155 Cobalt
Both EN 1.7710 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 29 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is EN 1.7710 steel and the bottom bar is R30155 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 280 to 320 | |
| 220 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 |
| Elongation at Break, % | 6.8 to 11 | |
| 34 |
| Fatigue Strength, MPa | 500 to 620 | |
| 310 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 930 to 1070 | |
| 850 |
| Tensile Strength: Yield (Proof), MPa | 800 to 1060 | |
| 390 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 300 |
| Maximum Temperature: Mechanical, °C | 440 | |
| 1100 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1470 |
| Melting Onset (Solidus), °C | 1430 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 450 |
| Thermal Conductivity, W/m-K | 41 | |
| 12 |
| Thermal Expansion, µm/m-K | 13 | |
| 14 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.5 | |
| 80 |
| Density, g/cm3 | 7.8 | |
| 8.5 |
| Embodied Carbon, kg CO2/kg material | 2.2 | |
| 9.7 |
| Embodied Energy, MJ/kg | 30 | |
| 150 |
| Embodied Water, L/kg | 57 | |
| 300 |
Common Calculations
| PREN (Pitting Resistance) | 4.5 | |
| 37 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 73 to 100 | |
| 230 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1680 to 2970 | |
| 370 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 |
| Strength to Weight: Axial, points | 33 to 38 | |
| 28 |
| Strength to Weight: Bending, points | 27 to 30 | |
| 24 |
| Thermal Diffusivity, mm2/s | 11 | |
| 3.2 |
| Thermal Shock Resistance, points | 27 to 31 | |
| 21 |
Alloy Composition
| Carbon (C), % | 0.12 to 0.18 | |
| 0.080 to 0.16 |
| Chromium (Cr), % | 1.3 to 1.8 | |
| 20 to 22.5 |
| Cobalt (Co), % | 0 | |
| 18.5 to 21 |
| Iron (Fe), % | 95.1 to 97 | |
| 24.3 to 36.2 |
| Manganese (Mn), % | 0.6 to 1.0 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0.8 to 1.0 | |
| 2.5 to 3.5 |
| Nickel (Ni), % | 0 | |
| 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 0.6 | |
| 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), % | 0.15 to 0.25 | |
| 0 |