R30155 Cobalt vs. EN 1.3558 Steel
Both R30155 cobalt and EN 1.3558 steel are iron alloys. They have a modest 38% 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 R30155 cobalt and the bottom bar is EN 1.3558 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 220 | |
| 230 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 210 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 81 | |
| 80 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 770 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 240 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 490 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1810 |
| Melting Onset (Solidus), °C | 1420 | |
| 1760 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 410 |
| Thermal Conductivity, W/m-K | 12 | |
| 20 |
| Thermal Expansion, µm/m-K | 14 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 80 | |
| 45 |
| Density, g/cm3 | 8.5 | |
| 9.3 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 8.4 |
| Embodied Energy, MJ/kg | 150 | |
| 130 |
| Embodied Water, L/kg | 300 | |
| 90 |
Common Calculations
| PREN (Pitting Resistance) | 37 | |
| 35 |
| Stiffness to Weight: Axial, points | 14 | |
| 12 |
| Stiffness to Weight: Bending, points | 23 | |
| 21 |
| Strength to Weight: Axial, points | 28 | |
| 23 |
| Strength to Weight: Bending, points | 24 | |
| 20 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 5.3 |
| Thermal Shock Resistance, points | 21 | |
| 22 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.16 | |
| 0.7 to 0.8 |
| Chromium (Cr), % | 20 to 22.5 | |
| 3.9 to 4.3 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0 to 0.3 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 73.7 to 77.6 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 0.4 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 0 to 0.6 |
| 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 | |
| 17.5 to 19 |
| Vanadium (V), % | 0 | |
| 1.0 to 1.3 |