Nickel 718 vs. R30008 Cobalt
Nickel 718 belongs to the nickel alloys classification, while R30008 cobalt belongs to the cobalt alloys. They have 53% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.
For each property being compared, the top bar is nickel 718 and the bottom bar is R30008 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 |
| Elongation at Break, % | 12 to 50 | |
| 1.1 to 73 |
| Fatigue Strength, MPa | 460 to 760 | |
| 320 to 530 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 75 | |
| 83 |
| Tensile Strength: Ultimate (UTS), MPa | 930 to 1530 | |
| 950 to 1700 |
| Tensile Strength: Yield (Proof), MPa | 510 to 1330 | |
| 500 to 1080 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 320 |
| Melting Completion (Liquidus), °C | 1340 | |
| 1400 |
| Melting Onset (Solidus), °C | 1260 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 450 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 75 | |
| 95 |
| Density, g/cm3 | 8.3 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 13 | |
| 8.1 |
| Embodied Energy, MJ/kg | 190 | |
| 110 |
| Embodied Water, L/kg | 250 | |
| 400 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 660 to 4560 | |
| 590 to 2720 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 24 |
| Strength to Weight: Axial, points | 31 to 51 | |
| 31 to 56 |
| Strength to Weight: Bending, points | 25 to 35 | |
| 25 to 37 |
| Thermal Shock Resistance, points | 27 to 44 | |
| 25 to 44 |
Alloy Composition
| Aluminum (Al), % | 0.2 to 0.8 | |
| 0 |
| Boron (B), % | 0 to 0.0060 | |
| 0 to 0.0010 |
| Carbon (C), % | 0 to 0.080 | |
| 0 to 0.15 |
| Chromium (Cr), % | 17 to 21 | |
| 18.5 to 21.5 |
| Cobalt (Co), % | 0 to 1.0 | |
| 39 to 42 |
| Copper (Cu), % | 0 to 0.3 | |
| 0 |
| Iron (Fe), % | 11.1 to 24.6 | |
| 7.6 to 20 |
| Manganese (Mn), % | 0 to 0.35 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 2.8 to 3.3 | |
| 6.5 to 7.5 |
| Nickel (Ni), % | 50 to 55 | |
| 15 to 18 |
| 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 |