R30021 Cobalt vs. EN 1.5503 Steel
R30021 cobalt belongs to the cobalt alloys classification, while EN 1.5503 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is R30021 cobalt and the bottom bar is EN 1.5503 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 190 |
| Elongation at Break, % | 9.0 | |
| 12 to 17 |
| Fatigue Strength, MPa | 250 | |
| 180 to 280 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 86 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 400 to 520 |
| Tensile Strength: Yield (Proof), MPa | 500 | |
| 270 to 430 |
Thermal Properties
| Latent Heat of Fusion, J/g | 330 | |
| 250 |
| Melting Completion (Liquidus), °C | 1350 | |
| 1460 |
| Melting Onset (Solidus), °C | 1190 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 15 | |
| 52 |
| Thermal Expansion, µm/m-K | 11 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.9 | |
| 7.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 8.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 1.4 |
| Embodied Energy, MJ/kg | 110 | |
| 18 |
| Embodied Water, L/kg | 520 | |
| 46 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 57 | |
| 41 to 81 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 570 | |
| 200 to 490 |
| Stiffness to Weight: Axial, points | 15 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 23 | |
| 14 to 19 |
| Strength to Weight: Bending, points | 21 | |
| 15 to 18 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 14 |
| Thermal Shock Resistance, points | 21 | |
| 12 to 15 |
Alloy Composition
| Boron (B), % | 0 | |
| 0.00080 to 0.0050 |
| Carbon (C), % | 0.2 to 0.35 | |
| 0.16 to 0.2 |
| Chromium (Cr), % | 26 to 29 | |
| 0 |
| Cobalt (Co), % | 61.7 to 67.3 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0 to 0.25 |
| Iron (Fe), % | 0 to 3.0 | |
| 98.4 to 99.239 |
| Manganese (Mn), % | 0 | |
| 0.6 to 0.8 |
| Molybdenum (Mo), % | 4.5 to 6.0 | |
| 0 |
| Nickel (Ni), % | 2.0 to 3.0 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 1.5 | |
| 0 to 0.3 |
| Sulfur (S), % | 0 | |
| 0 to 0.025 |