R31538 Cobalt vs. R30035 Cobalt
Both R31538 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 R31538 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 23 | |
| 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 22 | |
| 40 to 74 |
| Shear Modulus, GPa | 86 | |
| 84 to 89 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 to 1360 | |
| 900 to 1900 |
| Tensile Strength: Yield (Proof), MPa | 580 to 930 | |
| 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 | 8.1 | |
| 10 |
| Embodied Energy, MJ/kg | 110 | |
| 140 |
| Embodied Water, L/kg | 530 | |
| 410 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 200 | |
| 160 to 320 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 750 to 1920 | |
| 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 | 34 to 45 | |
| 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 | 25 to 33 | |
| 23 to 46 |
Alloy Composition
| Boron (B), % | 0 | |
| 0 to 0.015 |
| Carbon (C), % | 0.15 to 0.35 | |
| 0 to 0.025 |
| Chromium (Cr), % | 26 to 30 | |
| 19 to 21 |
| Cobalt (Co), % | 58.7 to 68.9 | |
| 29.1 to 39 |
| Iron (Fe), % | 0 to 0.75 | |
| 0 to 1.0 |
| 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 |