R30605 Cobalt vs. R31538 Cobalt
Both R30605 cobalt and R31538 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 R30605 cobalt and the bottom bar is R31538 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 220 |
| Elongation at Break, % | 34 | |
| 13 to 23 |
| Fatigue Strength, MPa | 260 to 590 | |
| 310 to 480 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 81 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 1130 to 1900 | |
| 1020 to 1360 |
| Tensile Strength: Yield (Proof), MPa | 470 to 1600 | |
| 580 to 930 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 320 |
| Melting Completion (Liquidus), °C | 1410 | |
| 1360 |
| Melting Onset (Solidus), °C | 1330 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 410 | |
| 450 |
| Thermal Conductivity, W/m-K | 9.6 | |
| 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 | 1.8 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.6 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 9.8 | |
| 8.1 |
| Embodied Energy, MJ/kg | 140 | |
| 110 |
| Embodied Water, L/kg | 450 | |
| 530 |
Common Calculations
| Stiffness to Weight: Axial, points | 12 | |
| 15 |
| Stiffness to Weight: Bending, points | 21 | |
| 24 |
| Strength to Weight: Axial, points | 33 to 55 | |
| 34 to 45 |
| Strength to Weight: Bending, points | 25 to 36 | |
| 27 to 32 |
| Thermal Diffusivity, mm2/s | 2.5 | |
| 3.5 |
| Thermal Shock Resistance, points | 31 to 52 | |
| 25 to 33 |
Alloy Composition
| Carbon (C), % | 0.050 to 0.15 | |
| 0.15 to 0.35 |
| Chromium (Cr), % | 19 to 21 | |
| 26 to 30 |
| Cobalt (Co), % | 46.4 to 57 | |
| 58.7 to 68.9 |
| Iron (Fe), % | 0 to 3.0 | |
| 0 to 0.75 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 9.0 to 11 | |
| 0 to 1.0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 |
| Silicon (Si), % | 0 to 0.4 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |
| Tungsten (W), % | 14 to 16 | |
| 0 |