Nickel 718 vs. R30003 Cobalt
Nickel 718 belongs to the nickel alloys classification, while R30003 cobalt belongs to the cobalt alloys. They have 53% of their average alloy composition in common. There are 27 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 nickel 718 and the bottom bar is R30003 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 |
| Elongation at Break, % | 12 to 50 | |
| 10 to 73 |
| Fatigue Strength, MPa | 460 to 760 | |
| 320 to 560 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 75 | |
| 83 |
| Tensile Strength: Ultimate (UTS), MPa | 930 to 1530 | |
| 970 to 1720 |
| Tensile Strength: Yield (Proof), MPa | 510 to 1330 | |
| 510 to 1090 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 310 |
| Melting Completion (Liquidus), °C | 1340 | |
| 1400 |
| Melting Onset (Solidus), °C | 1260 | |
| 1440 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 450 |
| Thermal Conductivity, W/m-K | 11 | |
| 13 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.4 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 1.5 | |
| 2.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 75 | |
| 95 |
| Density, g/cm3 | 8.3 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 13 | |
| 8.0 |
| Embodied Energy, MJ/kg | 190 | |
| 110 |
| Embodied Water, L/kg | 250 | |
| 400 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 660 to 4560 | |
| 600 to 2790 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 24 |
| Strength to Weight: Axial, points | 31 to 51 | |
| 32 to 57 |
| Strength to Weight: Bending, points | 25 to 35 | |
| 26 to 38 |
| Thermal Diffusivity, mm2/s | 3.0 | |
| 3.3 |
| Thermal Shock Resistance, points | 27 to 44 | |
| 26 to 45 |
Alloy Composition
| Aluminum (Al), % | 0.2 to 0.8 | |
| 0 |
| Boron (B), % | 0 to 0.0060 | |
| 0 to 0.1 |
| Carbon (C), % | 0 to 0.080 | |
| 0 to 0.15 |
| Chromium (Cr), % | 17 to 21 | |
| 19 to 21 |
| Cobalt (Co), % | 0 to 1.0 | |
| 39 to 41 |
| Copper (Cu), % | 0 to 0.3 | |
| 0 |
| Iron (Fe), % | 11.1 to 24.6 | |
| 10 to 20.5 |
| Manganese (Mn), % | 0 to 0.35 | |
| 1.5 to 2.5 |
| Molybdenum (Mo), % | 2.8 to 3.3 | |
| 6.0 to 8.0 |
| Nickel (Ni), % | 50 to 55 | |
| 14 to 16 |
| Niobium (Nb), % | 4.8 to 5.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 0.35 | |
| 0 to 1.2 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.015 |
| Titanium (Ti), % | 0.65 to 1.2 | |
| 0 |