R31539 Cobalt vs. R30035 Cobalt
Both R31539 cobalt and R30035 cobalt are cobalt alloys. They have 61% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.
For each property being compared, the top bar is R31539 cobalt and the bottom bar is R30035 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 220 to 230 |
| Elongation at Break, % | 13 to 22 | |
| 9.0 to 46 |
| Fatigue Strength, MPa | 310 to 480 | |
| 170 to 740 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Reduction in Area, % | 13 to 23 | |
| 40 to 74 |
| Shear Modulus, GPa | 86 | |
| 84 to 89 |
| Tensile Strength: Ultimate (UTS), MPa | 1000 to 1340 | |
| 900 to 1900 |
| Tensile Strength: Yield (Proof), MPa | 590 to 940 | |
| 300 to 1650 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 320 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1440 |
| Melting Onset (Solidus), °C | 1290 | |
| 1320 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 440 |
| Thermal Conductivity, W/m-K | 13 | |
| 11 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 1.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 1.8 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 8.7 |
| Embodied Carbon, kg CO2/kg material | 8.2 | |
| 10 |
| Embodied Energy, MJ/kg | 110 | |
| 140 |
| Embodied Water, L/kg | 530 | |
| 410 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 190 | |
| 160 to 320 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 780 to 2000 | |
| 210 to 5920 |
| Stiffness to Weight: Axial, points | 15 | |
| 14 to 15 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 to 24 |
| Strength to Weight: Axial, points | 33 to 44 | |
| 29 to 61 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 24 to 39 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 3.0 |
| Thermal Shock Resistance, points | 24 to 32 | |
| 23 to 46 |
Alloy Composition
| Aluminum (Al), % | 0.3 to 1.0 | |
| 0 |
| Boron (B), % | 0 | |
| 0 to 0.015 |
| Carbon (C), % | 0 to 0.14 | |
| 0 to 0.025 |
| Chromium (Cr), % | 26 to 30 | |
| 19 to 21 |
| Cobalt (Co), % | 57.7 to 68.7 | |
| 29.1 to 39 |
| Iron (Fe), % | 0 to 0.75 | |
| 0 to 1.0 |
| Lanthanum (La), % | 0.030 to 0.2 | |
| 0 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 to 0.15 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 9.0 to 10.5 |
| Nickel (Ni), % | 0 to 1.0 | |
| 33 to 37 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.15 |
| Sulfur (S), % | 0 | |
| 0 to 0.010 |
| Titanium (Ti), % | 0 | |
| 0 to 1.0 |