R30021 Cobalt vs. Grade 250 Maraging Steel
R30021 cobalt belongs to the cobalt alloys classification, while grade 250 maraging steel belongs to the iron alloys. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.
For each property being compared, the top bar is R30021 cobalt and the bottom bar is grade 250 maraging steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 1300 | |
| 730 to 1660 |
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 190 |
| Elongation at Break, % | 9.0 | |
| 7.3 to 17 |
| Poisson's Ratio | 0.29 | |
| 0.3 |
| Rockwell C Hardness | 32 | |
| 30 to 53 |
| Shear Modulus, GPa | 86 | |
| 75 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 970 to 1800 |
| Tensile Strength: Yield (Proof), MPa | 500 | |
| 660 to 1740 |
Thermal Properties
| Latent Heat of Fusion, J/g | 330 | |
| 270 |
| Melting Completion (Liquidus), °C | 1350 | |
| 1480 |
| Melting Onset (Solidus), °C | 1190 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 450 |
| Thermal Expansion, µm/m-K | 11 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 8.2 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 4.9 |
| Embodied Energy, MJ/kg | 110 | |
| 65 |
| Embodied Water, L/kg | 520 | |
| 140 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 57 | |
| 130 to 150 |
| Stiffness to Weight: Axial, points | 15 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 |
| Strength to Weight: Axial, points | 23 | |
| 33 to 61 |
| Strength to Weight: Bending, points | 21 | |
| 26 to 40 |
| Thermal Shock Resistance, points | 21 | |
| 29 to 54 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0.050 to 0.15 |
| Boron (B), % | 0 | |
| 0 to 0.0030 |
| Calcium (Ca), % | 0 | |
| 0 to 0.050 |
| Carbon (C), % | 0.2 to 0.35 | |
| 0 to 0.030 |
| Chromium (Cr), % | 26 to 29 | |
| 0 |
| Cobalt (Co), % | 61.7 to 67.3 | |
| 7.0 to 8.5 |
| Iron (Fe), % | 0 to 3.0 | |
| 66.3 to 71.1 |
| Manganese (Mn), % | 0 | |
| 0 to 0.1 |
| Molybdenum (Mo), % | 4.5 to 6.0 | |
| 4.6 to 5.2 |
| Nickel (Ni), % | 2.0 to 3.0 | |
| 17 to 19 |
| Phosphorus (P), % | 0 | |
| 0 to 0.010 |
| Silicon (Si), % | 0 to 1.5 | |
| 0 to 0.1 |
| Sulfur (S), % | 0 | |
| 0 to 0.010 |
| Titanium (Ti), % | 0 | |
| 0.3 to 0.5 |
| Zirconium (Zr), % | 0 | |
| 0 to 0.020 |