R30816 Cobalt vs. Nickel 718
R30816 cobalt belongs to the cobalt alloys classification, while nickel 718 belongs to the nickel alloys. They have 49% of their average alloy composition in common. There are 26 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 R30816 cobalt and the bottom bar is nickel 718.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 23 | |
| 12 to 50 |
| Fatigue Strength, MPa | 250 | |
| 460 to 760 |
| Poisson's Ratio | 0.3 | |
| 0.29 |
| Reduction in Area, % | 22 | |
| 34 to 64 |
| Shear Modulus, GPa | 81 | |
| 75 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 930 to 1530 |
| Tensile Strength: Yield (Proof), MPa | 460 | |
| 510 to 1330 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 310 |
| Melting Completion (Liquidus), °C | 1540 | |
| 1340 |
| Melting Onset (Solidus), °C | 1460 | |
| 1260 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 450 |
| Thermal Conductivity, W/m-K | 13 | |
| 11 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 8.3 |
| Embodied Carbon, kg CO2/kg material | 20 | |
| 13 |
| Embodied Energy, MJ/kg | 320 | |
| 190 |
| Embodied Water, L/kg | 440 | |
| 250 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 190 | |
| 140 to 390 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 | |
| 660 to 4560 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 22 | |
| 23 |
| Strength to Weight: Axial, points | 31 | |
| 31 to 51 |
| Strength to Weight: Bending, points | 25 | |
| 25 to 35 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 3.0 |
| Thermal Shock Resistance, points | 28 | |
| 27 to 44 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0.2 to 0.8 |
| Boron (B), % | 0 | |
| 0 to 0.0060 |
| Carbon (C), % | 0.32 to 0.42 | |
| 0 to 0.080 |
| Chromium (Cr), % | 19 to 21 | |
| 17 to 21 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 to 1.0 |
| Copper (Cu), % | 0 | |
| 0 to 0.3 |
| Iron (Fe), % | 0 to 5.0 | |
| 11.1 to 24.6 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 0.35 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 2.8 to 3.3 |
| Nickel (Ni), % | 19 to 21 | |
| 50 to 55 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 4.8 to 5.5 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.35 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.015 |
| Tantalum (Ta), % | 3.5 to 4.5 | |
| 0 |
| Titanium (Ti), % | 0 | |
| 0.65 to 1.2 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |