EN 1.7711 Steel vs. R30155 Cobalt
Both EN 1.7711 steel and R30155 cobalt are iron alloys. They have a modest 33% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is EN 1.7711 steel and the bottom bar is R30155 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 210 to 280 | |
| 220 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 |
| Elongation at Break, % | 16 to 22 | |
| 34 |
| Fatigue Strength, MPa | 290 to 520 | |
| 310 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 81 |
| Shear Strength, MPa | 440 to 570 | |
| 570 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 930 | |
| 850 |
| Tensile Strength: Yield (Proof), MPa | 400 to 800 | |
| 390 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 300 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 1100 |
| Melting Completion (Liquidus), °C | 1460 | |
| 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 | 3.0 | |
| 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 | 54 | |
| 300 |
Common Calculations
| PREN (Pitting Resistance) | 2.9 | |
| 37 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 130 to 140 | |
| 230 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 430 to 1690 | |
| 370 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 |
| Strength to Weight: Axial, points | 24 to 33 | |
| 28 |
| Strength to Weight: Bending, points | 22 to 27 | |
| 24 |
| Thermal Diffusivity, mm2/s | 8.9 | |
| 3.2 |
| Thermal Shock Resistance, points | 24 to 32 | |
| 21 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.015 | |
| 0 |
| Carbon (C), % | 0.36 to 0.44 | |
| 0.080 to 0.16 |
| Chromium (Cr), % | 0.9 to 1.2 | |
| 20 to 22.5 |
| Cobalt (Co), % | 0 | |
| 18.5 to 21 |
| Iron (Fe), % | 96 to 97.5 | |
| 24.3 to 36.2 |
| Manganese (Mn), % | 0.45 to 0.85 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0.5 to 0.65 | |
| 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 0.4 | |
| 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), % | 0.25 to 0.35 | |
| 0 |