R31538 Cobalt vs. R30075 Cobalt
Both R31538 cobalt and R30075 cobalt are cobalt alloys. Their average alloy composition is basically identical. There are 28 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.
For each property being compared, the top bar is R31538 cobalt and the bottom bar is R30075 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 210 to 250 |
| Elongation at Break, % | 13 to 23 | |
| 12 |
| Fatigue Strength, MPa | 310 to 480 | |
| 250 to 840 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Reduction in Area, % | 13 to 22 | |
| 20 |
| Shear Modulus, GPa | 86 | |
| 82 to 98 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 to 1360 | |
| 780 to 1280 |
| Tensile Strength: Yield (Proof), MPa | 580 to 930 | |
| 480 to 840 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 320 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1360 |
| Melting Onset (Solidus), °C | 1290 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 450 |
| Thermal Conductivity, W/m-K | 13 | |
| 13 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 8.1 |
| Embodied Energy, MJ/kg | 110 | |
| 110 |
| Embodied Water, L/kg | 530 | |
| 530 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 200 | |
| 84 to 140 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 750 to 1920 | |
| 560 to 1410 |
| Stiffness to Weight: Axial, points | 15 | |
| 14 to 17 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 to 25 |
| Strength to Weight: Axial, points | 34 to 45 | |
| 26 to 42 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 22 to 31 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 3.5 |
| Thermal Shock Resistance, points | 25 to 33 | |
| 21 to 29 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.1 |
| Boron (B), % | 0 | |
| 0 to 0.010 |
| Carbon (C), % | 0.15 to 0.35 | |
| 0 to 0.35 |
| Chromium (Cr), % | 26 to 30 | |
| 27 to 30 |
| Cobalt (Co), % | 58.7 to 68.9 | |
| 58.7 to 68 |
| Iron (Fe), % | 0 to 0.75 | |
| 0 to 0.75 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 0 to 1.0 | |
| 0 to 0.5 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 | |
| 0 to 0.020 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 | |
| 0 to 0.010 |
| Titanium (Ti), % | 0 | |
| 0 to 0.1 |
| Tungsten (W), % | 0 | |
| 0 to 0.2 |