Nickel 625 vs. R30021 Cobalt
Nickel 625 belongs to the nickel alloys classification, while R30021 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 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is nickel 625 and the bottom bar is R30021 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 220 |
| Elongation at Break, % | 33 to 34 | |
| 9.0 |
| Fatigue Strength, MPa | 240 to 320 | |
| 250 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 79 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 790 to 910 | |
| 700 |
| Tensile Strength: Yield (Proof), MPa | 320 to 450 | |
| 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 330 | |
| 330 |
| Melting Completion (Liquidus), °C | 1350 | |
| 1350 |
| Melting Onset (Solidus), °C | 1290 | |
| 1190 |
| Specific Heat Capacity, J/kg-K | 440 | |
| 450 |
| Thermal Conductivity, W/m-K | 11 | |
| 15 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.3 | |
| 1.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 1.4 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.6 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 14 | |
| 8.0 |
| Embodied Energy, MJ/kg | 190 | |
| 110 |
| Embodied Water, L/kg | 290 | |
| 520 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 220 to 250 | |
| 57 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 260 to 490 | |
| 570 |
| Stiffness to Weight: Axial, points | 13 | |
| 15 |
| Stiffness to Weight: Bending, points | 23 | |
| 24 |
| Strength to Weight: Axial, points | 26 to 29 | |
| 23 |
| Strength to Weight: Bending, points | 22 to 24 | |
| 21 |
| Thermal Diffusivity, mm2/s | 2.9 | |
| 3.8 |
| Thermal Shock Resistance, points | 22 to 25 | |
| 21 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.4 | |
| 0 |
| Carbon (C), % | 0 to 0.1 | |
| 0.2 to 0.35 |
| Chromium (Cr), % | 20 to 23 | |
| 26 to 29 |
| Cobalt (Co), % | 0 to 1.0 | |
| 61.7 to 67.3 |
| Iron (Fe), % | 0 to 5.0 | |
| 0 to 3.0 |
| Manganese (Mn), % | 0 to 0.5 | |
| 0 |
| Molybdenum (Mo), % | 8.0 to 10 | |
| 4.5 to 6.0 |
| Nickel (Ni), % | 58 to 68.9 | |
| 2.0 to 3.0 |
| Niobium (Nb), % | 3.2 to 4.2 | |
| 0 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 |
| Silicon (Si), % | 0 to 0.5 | |
| 0 to 1.5 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 |
| Titanium (Ti), % | 0 to 0.4 | |
| 0 |