R30021 Cobalt vs. Grade 350 Maraging Steel
R30021 cobalt belongs to the cobalt alloys classification, while grade 350 maraging steel belongs to the iron alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. 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 350 maraging steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 1300 | |
| 750 to 2400 |
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 190 |
| Elongation at Break, % | 9.0 | |
| 4.1 to 18 |
| Poisson's Ratio | 0.29 | |
| 0.3 |
| Rockwell C Hardness | 32 | |
| 34 to 60 |
| Shear Modulus, GPa | 86 | |
| 75 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 1140 to 2420 |
| Tensile Strength: Yield (Proof), MPa | 500 | |
| 830 to 2300 |
Thermal Properties
| Latent Heat of Fusion, J/g | 330 | |
| 270 |
| Melting Completion (Liquidus), °C | 1350 | |
| 1470 |
| Melting Onset (Solidus), °C | 1190 | |
| 1420 |
| 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 | |
| 5.6 |
| Embodied Energy, MJ/kg | 110 | |
| 74 |
| Embodied Water, L/kg | 520 | |
| 160 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 57 | |
| 98 to 190 |
| Stiffness to Weight: Axial, points | 15 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 |
| Strength to Weight: Axial, points | 23 | |
| 38 to 82 |
| Strength to Weight: Bending, points | 21 | |
| 29 to 49 |
| Thermal Shock Resistance, points | 21 | |
| 35 to 74 |
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 | |
| 11.5 to 12.5 |
| Iron (Fe), % | 0 to 3.0 | |
| 61.2 to 64.6 |
| 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 | |
| 18 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 | |
| 1.3 to 1.6 |
| Zirconium (Zr), % | 0 | |
| 0 to 0.020 |