R30155 Cobalt vs. EN 1.1221 Steel
Both R30155 cobalt and EN 1.1221 steel are iron alloys. They have a modest 32% 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 (5, in this case) are not shown.
For each property being compared, the top bar is R30155 cobalt and the bottom bar is EN 1.1221 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 220 | |
| 210 to 250 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 34 | |
| 10 to 21 |
| Fatigue Strength, MPa | 310 | |
| 240 to 340 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 81 | |
| 72 |
| Shear Strength, MPa | 570 | |
| 450 to 520 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 730 to 870 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 390 to 550 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 400 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1460 |
| Melting Onset (Solidus), °C | 1420 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 12 | |
| 48 |
| Thermal Expansion, µm/m-K | 14 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 80 | |
| 2.1 |
| Density, g/cm3 | 8.5 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 1.5 |
| Embodied Energy, MJ/kg | 150 | |
| 19 |
| Embodied Water, L/kg | 300 | |
| 47 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
| 67 to 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 370 | |
| 410 to 800 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 23 | |
| 24 |
| Strength to Weight: Axial, points | 28 | |
| 26 to 31 |
| Strength to Weight: Bending, points | 24 | |
| 23 to 26 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 13 |
| Thermal Shock Resistance, points | 21 | |
| 23 to 28 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.16 | |
| 0.57 to 0.65 |
| Chromium (Cr), % | 20 to 22.5 | |
| 0 to 0.4 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 97.1 to 98.8 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0.6 to 0.9 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 0 to 0.1 |
| Nickel (Ni), % | 19 to 21 | |
| 0 to 0.4 |
| Niobium (Nb), % | 0.75 to 1.3 | |
| 0 |
| Nitrogen (N), % | 0 to 0.2 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.4 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.035 |
| Tantalum (Ta), % | 0.75 to 1.3 | |
| 0 |
| Tungsten (W), % | 2.0 to 3.0 | |
| 0 |