R31539 Cobalt vs. ASTM A387 Grade 12 Steel
R31539 cobalt belongs to the cobalt alloys classification, while ASTM A387 grade 12 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is R31539 cobalt and the bottom bar is ASTM A387 grade 12 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 190 |
| Elongation at Break, % | 13 to 22 | |
| 25 |
| Fatigue Strength, MPa | 310 to 480 | |
| 190 to 230 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 86 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 1000 to 1340 | |
| 470 to 520 |
| Tensile Strength: Yield (Proof), MPa | 590 to 940 | |
| 260 to 310 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 250 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1470 |
| Melting Onset (Solidus), °C | 1290 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 13 | |
| 44 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 7.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 8.3 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 8.2 | |
| 1.6 |
| Embodied Energy, MJ/kg | 110 | |
| 21 |
| Embodied Water, L/kg | 530 | |
| 51 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 190 | |
| 98 to 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 780 to 2000 | |
| 180 to 250 |
| Stiffness to Weight: Axial, points | 15 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 33 to 44 | |
| 16 to 18 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 17 to 18 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 12 |
| Thermal Shock Resistance, points | 24 to 32 | |
| 14 to 15 |
Alloy Composition
| Aluminum (Al), % | 0.3 to 1.0 | |
| 0 |
| Carbon (C), % | 0 to 0.14 | |
| 0.050 to 0.17 |
| Chromium (Cr), % | 26 to 30 | |
| 0.8 to 1.2 |
| Cobalt (Co), % | 57.7 to 68.7 | |
| 0 |
| Iron (Fe), % | 0 to 0.75 | |
| 97 to 98.2 |
| Lanthanum (La), % | 0.030 to 0.2 | |
| 0 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.4 to 0.65 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 0.45 to 0.6 |
| Nickel (Ni), % | 0 to 1.0 | |
| 0 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 1.0 | |
| 0.15 to 0.4 |
| Sulfur (S), % | 0 | |
| 0 to 0.025 |