Grade 300 Maraging Steel vs. R30605 Cobalt
Grade 300 maraging steel belongs to the iron alloys classification, while R30605 cobalt belongs to the cobalt alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 20 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.
For each property being compared, the top bar is grade 300 maraging steel and the bottom bar is R30605 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 |
| Elongation at Break, % | 6.5 to 18 | |
| 34 |
| Poisson's Ratio | 0.3 | |
| 0.29 |
| Shear Modulus, GPa | 75 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 1030 to 2030 | |
| 1130 to 1900 |
| Tensile Strength: Yield (Proof), MPa | 760 to 1990 | |
| 470 to 1600 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 290 |
| Melting Completion (Liquidus), °C | 1480 | |
| 1410 |
| Melting Onset (Solidus), °C | 1430 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 410 |
| Thermal Expansion, µm/m-K | 12 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.2 | |
| 9.6 |
| Embodied Carbon, kg CO2/kg material | 5.1 | |
| 9.8 |
| Embodied Energy, MJ/kg | 68 | |
| 140 |
| Embodied Water, L/kg | 150 | |
| 450 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 12 |
| Stiffness to Weight: Bending, points | 23 | |
| 21 |
| Strength to Weight: Axial, points | 35 to 68 | |
| 33 to 55 |
| Strength to Weight: Bending, points | 28 to 43 | |
| 25 to 36 |
| Thermal Shock Resistance, points | 31 to 62 | |
| 31 to 52 |
Alloy Composition
| Aluminum (Al), % | 0.050 to 0.15 | |
| 0 |
| Boron (B), % | 0 to 0.0030 | |
| 0 |
| Calcium (Ca), % | 0 to 0.050 | |
| 0 |
| Carbon (C), % | 0 to 0.030 | |
| 0.050 to 0.15 |
| Chromium (Cr), % | 0 | |
| 19 to 21 |
| Cobalt (Co), % | 8.5 to 9.5 | |
| 46.4 to 57 |
| Iron (Fe), % | 65 to 68.4 | |
| 0 to 3.0 |
| Manganese (Mn), % | 0 to 0.1 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 4.6 to 5.2 | |
| 0 |
| Nickel (Ni), % | 18 to 19 | |
| 9.0 to 11 |
| Phosphorus (P), % | 0 to 0.010 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.1 | |
| 0 to 0.4 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0.5 to 0.8 | |
| 0 |
| Tungsten (W), % | 0 | |
| 14 to 16 |
| Zirconium (Zr), % | 0 to 0.020 | |
| 0 |