R31538 Cobalt vs. R30605 Cobalt
Both R31538 cobalt and R30605 cobalt are cobalt alloys. They have 73% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is R31538 cobalt and the bottom bar is R30605 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 210 |
| Elongation at Break, % | 13 to 23 | |
| 34 |
| Fatigue Strength, MPa | 310 to 480 | |
| 260 to 590 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 86 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 to 1360 | |
| 1130 to 1900 |
| Tensile Strength: Yield (Proof), MPa | 580 to 930 | |
| 470 to 1600 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 290 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1410 |
| Melting Onset (Solidus), °C | 1290 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 410 |
| Thermal Conductivity, W/m-K | 13 | |
| 9.6 |
| 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 | |
| 1.8 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 9.6 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 9.8 |
| Embodied Energy, MJ/kg | 110 | |
| 140 |
| Embodied Water, L/kg | 530 | |
| 450 |
Common Calculations
| Stiffness to Weight: Axial, points | 15 | |
| 12 |
| Stiffness to Weight: Bending, points | 24 | |
| 21 |
| Strength to Weight: Axial, points | 34 to 45 | |
| 33 to 55 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 25 to 36 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 2.5 |
| Thermal Shock Resistance, points | 25 to 33 | |
| 31 to 52 |
Alloy Composition
| Carbon (C), % | 0.15 to 0.35 | |
| 0.050 to 0.15 |
| Chromium (Cr), % | 26 to 30 | |
| 19 to 21 |
| Cobalt (Co), % | 58.7 to 68.9 | |
| 46.4 to 57 |
| Iron (Fe), % | 0 to 0.75 | |
| 0 to 3.0 |
| Manganese (Mn), % | 0 to 1.0 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 0 |
| Nickel (Ni), % | 0 to 1.0 | |
| 9.0 to 11 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.4 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Tungsten (W), % | 0 | |
| 14 to 16 |