Nickel 718 vs. R30035 Cobalt
Nickel 718 belongs to the nickel alloys classification, while R30035 cobalt belongs to the cobalt alloys. They have 59% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is nickel 718 and the bottom bar is R30035 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 220 to 230 |
| Elongation at Break, % | 12 to 50 | |
| 9.0 to 46 |
| Fatigue Strength, MPa | 460 to 760 | |
| 170 to 740 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Reduction in Area, % | 34 to 64 | |
| 40 to 74 |
| Shear Modulus, GPa | 75 | |
| 84 to 89 |
| Tensile Strength: Ultimate (UTS), MPa | 930 to 1530 | |
| 900 to 1900 |
| Tensile Strength: Yield (Proof), MPa | 510 to 1330 | |
| 300 to 1650 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 320 |
| Melting Completion (Liquidus), °C | 1340 | |
| 1440 |
| Melting Onset (Solidus), °C | 1260 | |
| 1320 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 440 |
| Thermal Conductivity, W/m-K | 11 | |
| 11 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.4 | |
| 1.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 1.5 | |
| 1.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 75 | |
| 100 |
| Density, g/cm3 | 8.3 | |
| 8.7 |
| Embodied Carbon, kg CO2/kg material | 13 | |
| 10 |
| Embodied Energy, MJ/kg | 190 | |
| 140 |
| Embodied Water, L/kg | 250 | |
| 410 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 390 | |
| 160 to 320 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 660 to 4560 | |
| 210 to 5920 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 to 15 |
| Stiffness to Weight: Bending, points | 23 | |
| 23 to 24 |
| Strength to Weight: Axial, points | 31 to 51 | |
| 29 to 61 |
| Strength to Weight: Bending, points | 25 to 35 | |
| 24 to 39 |
| Thermal Diffusivity, mm2/s | 3.0 | |
| 3.0 |
| Thermal Shock Resistance, points | 27 to 44 | |
| 23 to 46 |
Alloy Composition
| Aluminum (Al), % | 0.2 to 0.8 | |
| 0 |
| Boron (B), % | 0 to 0.0060 | |
| 0 to 0.015 |
| Carbon (C), % | 0 to 0.080 | |
| 0 to 0.025 |
| Chromium (Cr), % | 17 to 21 | |
| 19 to 21 |
| Cobalt (Co), % | 0 to 1.0 | |
| 29.1 to 39 |
| Copper (Cu), % | 0 to 0.3 | |
| 0 |
| Iron (Fe), % | 11.1 to 24.6 | |
| 0 to 1.0 |
| Manganese (Mn), % | 0 to 0.35 | |
| 0 to 0.15 |
| Molybdenum (Mo), % | 2.8 to 3.3 | |
| 9.0 to 10.5 |
| Nickel (Ni), % | 50 to 55 | |
| 33 to 37 |
| 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 0.15 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.010 |
| Titanium (Ti), % | 0.65 to 1.2 | |
| 0 to 1.0 |