R31538 Cobalt vs. EN 2.4878 Nickel
R31538 cobalt belongs to the cobalt alloys classification, while EN 2.4878 nickel belongs to the nickel alloys. They have 47% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is R31538 cobalt and the bottom bar is EN 2.4878 nickel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 200 |
| Elongation at Break, % | 13 to 23 | |
| 13 to 17 |
| Fatigue Strength, MPa | 310 to 480 | |
| 400 to 410 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 86 | |
| 78 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 to 1360 | |
| 1210 to 1250 |
| Tensile Strength: Yield (Proof), MPa | 580 to 930 | |
| 740 to 780 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 330 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1370 |
| Melting Onset (Solidus), °C | 1290 | |
| 1320 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 460 |
| Thermal Conductivity, W/m-K | 13 | |
| 11 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 8.3 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 10 |
| Embodied Energy, MJ/kg | 110 | |
| 150 |
| Embodied Water, L/kg | 530 | |
| 370 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 200 | |
| 150 to 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 750 to 1920 | |
| 1370 to 1540 |
| Stiffness to Weight: Axial, points | 15 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 34 to 45 | |
| 41 to 42 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 31 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 2.8 |
| Thermal Shock Resistance, points | 25 to 33 | |
| 37 to 39 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 1.2 to 1.6 |
| Boron (B), % | 0 | |
| 0.010 to 0.015 |
| Carbon (C), % | 0.15 to 0.35 | |
| 0.030 to 0.070 |
| Chromium (Cr), % | 26 to 30 | |
| 23 to 25 |
| Cobalt (Co), % | 58.7 to 68.9 | |
| 19 to 21 |
| Copper (Cu), % | 0 | |
| 0 to 0.2 |
| Iron (Fe), % | 0 to 0.75 | |
| 0 to 1.0 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 to 0.5 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 1.0 to 2.0 |
| Nickel (Ni), % | 0 to 1.0 | |
| 43.6 to 52.2 |
| Niobium (Nb), % | 0 | |
| 0.7 to 1.2 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.010 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 | |
| 0 to 0.0070 |
| Tantalum (Ta), % | 0 | |
| 0 to 0.050 |
| Titanium (Ti), % | 0 | |
| 2.8 to 3.2 |
| Zirconium (Zr), % | 0 | |
| 0.030 to 0.070 |