R31538 Cobalt vs. SAE-AISI D2 Steel
R31538 cobalt belongs to the cobalt alloys classification, while SAE-AISI D2 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is R31538 cobalt and the bottom bar is SAE-AISI D2 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 190 |
| Elongation at Break, % | 13 to 23 | |
| 5.0 to 16 |
| Fatigue Strength, MPa | 310 to 480 | |
| 310 to 860 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 86 | |
| 75 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 to 1360 | |
| 760 to 2000 |
| Tensile Strength: Yield (Proof), MPa | 580 to 930 | |
| 470 to 1510 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 270 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1440 |
| Melting Onset (Solidus), °C | 1290 | |
| 1390 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 480 |
| Thermal Conductivity, W/m-K | 13 | |
| 31 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 4.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 5.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 3.4 |
| Embodied Energy, MJ/kg | 110 | |
| 50 |
| Embodied Water, L/kg | 530 | |
| 100 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 200 | |
| 92 to 100 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 750 to 1920 | |
| 570 to 5940 |
| Stiffness to Weight: Axial, points | 15 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 34 to 45 | |
| 27 to 72 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 24 to 46 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 8.3 |
| Thermal Shock Resistance, points | 25 to 33 | |
| 25 to 67 |
Alloy Composition
| Carbon (C), % | 0.15 to 0.35 | |
| 1.4 to 1.6 |
| Chromium (Cr), % | 26 to 30 | |
| 11 to 13 |
| Cobalt (Co), % | 58.7 to 68.9 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0 to 0.25 |
| Iron (Fe), % | 0 to 0.75 | |
| 81.3 to 86.9 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 to 0.6 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 0.7 to 1.2 |
| Nickel (Ni), % | 0 to 1.0 | |
| 0 to 0.3 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.6 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Vanadium (V), % | 0 | |
| 0 to 1.1 |