R30605 Cobalt vs. Nickel 685
R30605 cobalt belongs to the cobalt alloys classification, while nickel 685 belongs to the nickel alloys. They have 45% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.
For each property being compared, the top bar is R30605 cobalt and the bottom bar is nickel 685.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Elongation at Break, % | 34 | |
| 17 |
| Fatigue Strength, MPa | 260 to 590 | |
| 470 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 81 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 1130 to 1900 | |
| 1250 |
| Tensile Strength: Yield (Proof), MPa | 470 to 1600 | |
| 850 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 320 |
| Melting Completion (Liquidus), °C | 1410 | |
| 1380 |
| Melting Onset (Solidus), °C | 1330 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 410 | |
| 460 |
| Thermal Conductivity, W/m-K | 9.6 | |
| 13 |
| Thermal Expansion, µm/m-K | 12 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.6 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 9.8 | |
| 10 |
| Embodied Energy, MJ/kg | 140 | |
| 140 |
| Embodied Water, L/kg | 450 | |
| 340 |
Common Calculations
| Stiffness to Weight: Axial, points | 12 | |
| 13 |
| Stiffness to Weight: Bending, points | 21 | |
| 23 |
| Strength to Weight: Axial, points | 33 to 55 | |
| 42 |
| Strength to Weight: Bending, points | 25 to 36 | |
| 31 |
| Thermal Diffusivity, mm2/s | 2.5 | |
| 3.3 |
| Thermal Shock Resistance, points | 31 to 52 | |
| 37 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 1.2 to 1.6 |
| Boron (B), % | 0 | |
| 0.0030 to 0.010 |
| Carbon (C), % | 0.050 to 0.15 | |
| 0.030 to 0.1 |
| Chromium (Cr), % | 19 to 21 | |
| 18 to 21 |
| Cobalt (Co), % | 46.4 to 57 | |
| 12 to 15 |
| Copper (Cu), % | 0 | |
| 0 to 0.5 |
| Iron (Fe), % | 0 to 3.0 | |
| 0 to 2.0 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 3.5 to 5.0 |
| Nickel (Ni), % | 9.0 to 11 | |
| 49.6 to 62.5 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 0.4 | |
| 0 to 0.75 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 | |
| 2.8 to 3.3 |
| Tungsten (W), % | 14 to 16 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 0.020 to 0.12 |