Grade 250 Maraging Steel vs. R31538 Cobalt
Grade 250 maraging steel belongs to the iron alloys classification, while R31538 cobalt belongs to the cobalt alloys. There are 22 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 250 maraging steel and the bottom bar is R31538 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 220 |
| Elongation at Break, % | 7.3 to 17 | |
| 13 to 23 |
| Poisson's Ratio | 0.3 | |
| 0.29 |
| Rockwell C Hardness | 30 to 53 | |
| 25 to 35 |
| Shear Modulus, GPa | 75 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 970 to 1800 | |
| 1020 to 1360 |
| Tensile Strength: Yield (Proof), MPa | 660 to 1740 | |
| 580 to 930 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 320 |
| Melting Completion (Liquidus), °C | 1480 | |
| 1360 |
| Melting Onset (Solidus), °C | 1430 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 450 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.2 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 4.9 | |
| 8.1 |
| Embodied Energy, MJ/kg | 65 | |
| 110 |
| Embodied Water, L/kg | 140 | |
| 530 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 130 to 150 | |
| 140 to 200 |
| Stiffness to Weight: Axial, points | 13 | |
| 15 |
| Stiffness to Weight: Bending, points | 23 | |
| 24 |
| Strength to Weight: Axial, points | 33 to 61 | |
| 34 to 45 |
| Strength to Weight: Bending, points | 26 to 40 | |
| 27 to 32 |
| Thermal Shock Resistance, points | 29 to 54 | |
| 25 to 33 |
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 | |
| 0.15 to 0.35 |
| Chromium (Cr), % | 0 | |
| 26 to 30 |
| Cobalt (Co), % | 7.0 to 8.5 | |
| 58.7 to 68.9 |
| Iron (Fe), % | 66.3 to 71.1 | |
| 0 to 0.75 |
| Manganese (Mn), % | 0 to 0.1 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 4.6 to 5.2 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 17 to 19 | |
| 0 to 1.0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 to 0.010 | |
| 0 |
| Silicon (Si), % | 0 to 0.1 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 |
| Titanium (Ti), % | 0.3 to 0.5 | |
| 0 |
| Zirconium (Zr), % | 0 to 0.020 | |
| 0 |