Nickel 725 vs. R30605 Cobalt
Nickel 725 belongs to the nickel alloys classification, while R30605 cobalt belongs to the cobalt alloys. They have a modest 32% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 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 R30605 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 210 |
| Elongation at Break, % | 34 | |
| 34 |
| Fatigue Strength, MPa | 260 | |
| 260 to 590 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 78 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 860 | |
| 1130 to 1900 |
| Tensile Strength: Yield (Proof), MPa | 350 | |
| 470 to 1600 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 290 |
| Melting Completion (Liquidus), °C | 1340 | |
| 1410 |
| Melting Onset (Solidus), °C | 1270 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 440 | |
| 410 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.5 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 1.6 | |
| 1.8 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.5 | |
| 9.6 |
| Embodied Carbon, kg CO2/kg material | 13 | |
| 9.8 |
| Embodied Energy, MJ/kg | 190 | |
| 140 |
| Embodied Water, L/kg | 270 | |
| 450 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 12 |
| Stiffness to Weight: Bending, points | 23 | |
| 21 |
| Strength to Weight: Axial, points | 28 | |
| 33 to 55 |
| Strength to Weight: Bending, points | 24 | |
| 25 to 36 |
| Thermal Shock Resistance, points | 23 | |
| 31 to 52 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.35 | |
| 0 |
| Carbon (C), % | 0 to 0.030 | |
| 0.050 to 0.15 |
| Chromium (Cr), % | 19 to 22.5 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 46.4 to 57 |
| Iron (Fe), % | 2.3 to 15.3 | |
| 0 to 3.0 |
| Manganese (Mn), % | 0 to 0.35 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 7.0 to 9.5 | |
| 0 |
| Nickel (Ni), % | 55 to 59 | |
| 9.0 to 11 |
| Niobium (Nb), % | 2.8 to 4.0 | |
| 0 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.2 | |
| 0 to 0.4 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.030 |
| Titanium (Ti), % | 1.0 to 1.7 | |
| 0 |
| Tungsten (W), % | 0 | |
| 14 to 16 |