R30075 Cobalt vs. R31538 Cobalt
Both R30075 cobalt and R31538 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 R30075 cobalt and the bottom bar is R31538 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 to 250 | |
| 220 |
| Elongation at Break, % | 12 | |
| 13 to 23 |
| Fatigue Strength, MPa | 250 to 840 | |
| 310 to 480 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Reduction in Area, % | 20 | |
| 13 to 22 |
| Shear Modulus, GPa | 82 to 98 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 780 to 1280 | |
| 1020 to 1360 |
| Tensile Strength: Yield (Proof), MPa | 480 to 840 | |
| 580 to 930 |
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 | 12 | |
| 13 |
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 | 84 to 140 | |
| 140 to 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 560 to 1410 | |
| 750 to 1920 |
| Stiffness to Weight: Axial, points | 14 to 17 | |
| 15 |
| Stiffness to Weight: Bending, points | 24 to 25 | |
| 24 |
| Strength to Weight: Axial, points | 26 to 42 | |
| 34 to 45 |
| Strength to Weight: Bending, points | 22 to 31 | |
| 27 to 32 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 3.5 |
| Thermal Shock Resistance, points | 21 to 29 | |
| 25 to 33 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.1 | |
| 0 |
| Boron (B), % | 0 to 0.010 | |
| 0 |
| Carbon (C), % | 0 to 0.35 | |
| 0.15 to 0.35 |
| Chromium (Cr), % | 27 to 30 | |
| 26 to 30 |
| Cobalt (Co), % | 58.7 to 68 | |
| 58.7 to 68.9 |
| 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 0.5 | |
| 0 to 1.0 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 |
| Titanium (Ti), % | 0 to 0.1 | |
| 0 |
| Tungsten (W), % | 0 to 0.2 | |
| 0 |