R30155 Cobalt vs. EN 1.6570 Steel
Both R30155 cobalt and EN 1.6570 steel are iron alloys. They have a modest 35% 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 R30155 cobalt and the bottom bar is EN 1.6570 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 220 | |
| 270 to 340 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 34 | |
| 11 to 17 |
| Fatigue Strength, MPa | 310 | |
| 500 to 660 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 81 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 910 to 1130 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 760 to 1060 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 440 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1460 |
| Melting Onset (Solidus), °C | 1420 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 12 | |
| 40 |
| Thermal Expansion, µm/m-K | 14 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 80 | |
| 3.9 |
| Density, g/cm3 | 8.5 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 1.7 |
| Embodied Energy, MJ/kg | 150 | |
| 23 |
| Embodied Water, L/kg | 300 | |
| 56 |
Common Calculations
| PREN (Pitting Resistance) | 37 | |
| 2.5 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
| 120 to 140 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 370 | |
| 1520 to 3010 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 23 | |
| 24 |
| Strength to Weight: Axial, points | 28 | |
| 32 to 40 |
| Strength to Weight: Bending, points | 24 | |
| 27 to 31 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 11 |
| Thermal Shock Resistance, points | 21 | |
| 27 to 33 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.16 | |
| 0.28 to 0.35 |
| Chromium (Cr), % | 20 to 22.5 | |
| 1.0 to 1.4 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 94 to 96.2 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0.6 to 1.0 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 0.3 to 0.5 |
| Nickel (Ni), % | 19 to 21 | |
| 1.6 to 2.1 |
| Niobium (Nb), % | 0.75 to 1.3 | |
| 0 |
| Nitrogen (N), % | 0 to 0.2 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.020 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.6 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.015 |
| Tantalum (Ta), % | 0.75 to 1.3 | |
| 0 |
| Tungsten (W), % | 2.0 to 3.0 | |
| 0 |