R30155 Cobalt vs. EN 1.7366 Steel
Both R30155 cobalt and EN 1.7366 steel are iron alloys. They have a modest 37% 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 (5, in this case) are not shown.
For each property being compared, the top bar is R30155 cobalt and the bottom bar is EN 1.7366 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 220 | |
| 140 to 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 34 | |
| 17 to 19 |
| Fatigue Strength, MPa | 310 | |
| 160 to 320 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 81 | |
| 74 |
| Shear Strength, MPa | 570 | |
| 290 to 440 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 460 to 710 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 230 to 480 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 260 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 510 |
| 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 | |
| 4.3 |
| Density, g/cm3 | 8.5 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 1.7 |
| Embodied Energy, MJ/kg | 150 | |
| 23 |
| Embodied Water, L/kg | 300 | |
| 69 |
Common Calculations
| PREN (Pitting Resistance) | 37 | |
| 6.8 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
| 74 to 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 370 | |
| 140 to 600 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 25 |
| Strength to Weight: Axial, points | 28 | |
| 16 to 25 |
| Strength to Weight: Bending, points | 24 | |
| 17 to 23 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 11 |
| Thermal Shock Resistance, points | 21 | |
| 13 to 20 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.16 | |
| 0 to 0.18 |
| Chromium (Cr), % | 20 to 22.5 | |
| 4.0 to 6.0 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 91.9 to 95.3 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0.3 to 0.8 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 0.45 to 0.65 |
| Nickel (Ni), % | 19 to 21 | |
| 0 |
| Niobium (Nb), % | 0.75 to 1.3 | |
| 0 |
| Nitrogen (N), % | 0 to 0.2 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.4 |
| 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 |