R31538 Cobalt vs. Nickel 625
R31538 cobalt belongs to the cobalt alloys classification, while nickel 625 belongs to the nickel alloys. They have a modest 29% 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 R31538 cobalt and the bottom bar is nickel 625.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 200 |
| Elongation at Break, % | 13 to 23 | |
| 33 to 34 |
| Fatigue Strength, MPa | 310 to 480 | |
| 240 to 320 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 86 | |
| 79 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 to 1360 | |
| 790 to 910 |
| Tensile Strength: Yield (Proof), MPa | 580 to 930 | |
| 320 to 450 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 330 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1350 |
| Melting Onset (Solidus), °C | 1290 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 440 |
| Thermal Conductivity, W/m-K | 13 | |
| 11 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 1.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 1.4 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 8.6 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 14 |
| Embodied Energy, MJ/kg | 110 | |
| 190 |
| Embodied Water, L/kg | 530 | |
| 290 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 200 | |
| 220 to 250 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 750 to 1920 | |
| 260 to 490 |
| Stiffness to Weight: Axial, points | 15 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 |
| Strength to Weight: Axial, points | 34 to 45 | |
| 26 to 29 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 22 to 24 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 2.9 |
| Thermal Shock Resistance, points | 25 to 33 | |
| 22 to 25 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.4 |
| Carbon (C), % | 0.15 to 0.35 | |
| 0 to 0.1 |
| Chromium (Cr), % | 26 to 30 | |
| 20 to 23 |
| Cobalt (Co), % | 58.7 to 68.9 | |
| 0 to 1.0 |
| Iron (Fe), % | 0 to 0.75 | |
| 0 to 5.0 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 to 0.5 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 8.0 to 10 |
| Nickel (Ni), % | 0 to 1.0 | |
| 58 to 68.9 |
| Niobium (Nb), % | 0 | |
| 3.2 to 4.2 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 | |
| 0 to 0.015 |
| Titanium (Ti), % | 0 | |
| 0 to 0.4 |