R30003 Cobalt vs. Nickel 685
R30003 cobalt belongs to the cobalt alloys classification, while nickel 685 belongs to the nickel alloys. They have 54% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is R30003 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, % | 10 to 73 | |
| 17 |
| Fatigue Strength, MPa | 320 to 560 | |
| 470 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 83 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 970 to 1720 | |
| 1250 |
| Tensile Strength: Yield (Proof), MPa | 510 to 1090 | |
| 850 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 320 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1380 |
| Melting Onset (Solidus), °C | 1440 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 460 |
| Thermal Conductivity, W/m-K | 13 | |
| 13 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 95 | |
| 75 |
| Density, g/cm3 | 8.4 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 10 |
| Embodied Energy, MJ/kg | 110 | |
| 140 |
| Embodied Water, L/kg | 400 | |
| 340 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 600 to 2790 | |
| 1820 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 |
| Strength to Weight: Axial, points | 32 to 57 | |
| 42 |
| Strength to Weight: Bending, points | 26 to 38 | |
| 31 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 3.3 |
| Thermal Shock Resistance, points | 26 to 45 | |
| 37 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 1.2 to 1.6 |
| Boron (B), % | 0 to 0.1 | |
| 0.0030 to 0.010 |
| Carbon (C), % | 0 to 0.15 | |
| 0.030 to 0.1 |
| Chromium (Cr), % | 19 to 21 | |
| 18 to 21 |
| Cobalt (Co), % | 39 to 41 | |
| 12 to 15 |
| Copper (Cu), % | 0 | |
| 0 to 0.5 |
| Iron (Fe), % | 10 to 20.5 | |
| 0 to 2.0 |
| Manganese (Mn), % | 1.5 to 2.5 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 6.0 to 8.0 | |
| 3.5 to 5.0 |
| Nickel (Ni), % | 14 to 16 | |
| 49.6 to 62.5 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 1.2 | |
| 0 to 0.75 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 | |
| 2.8 to 3.3 |
| Zinc (Zn), % | 0 | |
| 0.020 to 0.12 |