Nickel 725 vs. R30816 Cobalt
Nickel 725 belongs to the nickel alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have 50% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is nickel 725 and the bottom bar is R30816 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 210 |
| Elongation at Break, % | 34 | |
| 23 |
| Fatigue Strength, MPa | 260 | |
| 250 |
| Poisson's Ratio | 0.29 | |
| 0.3 |
| Reduction in Area, % | 45 | |
| 22 |
| Shear Modulus, GPa | 78 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 860 | |
| 1020 |
| Tensile Strength: Yield (Proof), MPa | 350 | |
| 460 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 300 |
| Melting Completion (Liquidus), °C | 1340 | |
| 1540 |
| Melting Onset (Solidus), °C | 1270 | |
| 1460 |
| Specific Heat Capacity, J/kg-K | 440 | |
| 420 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.5 | |
| 9.1 |
| Embodied Carbon, kg CO2/kg material | 13 | |
| 20 |
| Embodied Energy, MJ/kg | 190 | |
| 320 |
| Embodied Water, L/kg | 270 | |
| 440 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 240 | |
| 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 300 | |
| 510 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 23 | |
| 22 |
| Strength to Weight: Axial, points | 28 | |
| 31 |
| Strength to Weight: Bending, points | 24 | |
| 25 |
| Thermal Shock Resistance, points | 23 | |
| 28 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.35 | |
| 0 |
| Carbon (C), % | 0 to 0.030 | |
| 0.32 to 0.42 |
| Chromium (Cr), % | 19 to 22.5 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 40 to 49.8 |
| Iron (Fe), % | 2.3 to 15.3 | |
| 0 to 5.0 |
| Manganese (Mn), % | 0 to 0.35 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 7.0 to 9.5 | |
| 3.5 to 4.5 |
| Nickel (Ni), % | 55 to 59 | |
| 19 to 21 |
| Niobium (Nb), % | 2.8 to 4.0 | |
| 3.5 to 4.5 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.2 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 0 | |
| 3.5 to 4.5 |
| Titanium (Ti), % | 1.0 to 1.7 | |
| 0 |
| Tungsten (W), % | 0 | |
| 3.5 to 4.5 |