R31538 Cobalt vs. C18400 Copper
R31538 cobalt belongs to the cobalt alloys classification, while C18400 copper belongs to the copper alloys. There are 26 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 C18400 copper.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 120 |
| Elongation at Break, % | 13 to 23 | |
| 13 to 50 |
| Poisson's Ratio | 0.29 | |
| 0.34 |
| Shear Modulus, GPa | 86 | |
| 44 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 to 1360 | |
| 270 to 490 |
| Tensile Strength: Yield (Proof), MPa | 580 to 930 | |
| 110 to 480 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 210 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1080 |
| Melting Onset (Solidus), °C | 1290 | |
| 1070 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 390 |
| Thermal Conductivity, W/m-K | 13 | |
| 320 |
| Thermal Expansion, µm/m-K | 13 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 80 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 81 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 8.9 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 2.6 |
| Embodied Energy, MJ/kg | 110 | |
| 41 |
| Embodied Water, L/kg | 530 | |
| 310 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 200 | |
| 63 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 750 to 1920 | |
| 54 to 980 |
| Stiffness to Weight: Axial, points | 15 | |
| 7.3 |
| Stiffness to Weight: Bending, points | 24 | |
| 18 |
| Strength to Weight: Axial, points | 34 to 45 | |
| 8.5 to 15 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 10 to 16 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 94 |
| Thermal Shock Resistance, points | 25 to 33 | |
| 9.6 to 17 |
Alloy Composition
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| Arsenic (As), % | 0 | |
| 0 to 0.0050 |
| Calcium (Ca), % | 0 | |
| 0 to 0.0050 |
| Carbon (C), % | 0.15 to 0.35 | |
| 0 |
| Chromium (Cr), % | 26 to 30 | |
| 0.4 to 1.2 |
| Cobalt (Co), % | 58.7 to 68.9 | |
| 0 |
| Copper (Cu), % | 0 | |
| 97.2 to 99.6 |
| Iron (Fe), % | 0 to 0.75 | |
| 0 to 0.15 |
| Lithium (Li), % | 0 | |
| 0 to 0.050 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 0 |
| Nickel (Ni), % | 0 to 1.0 | |
| 0 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.050 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.1 |
| Zinc (Zn), % | 0 | |
| 0 to 0.7 |
| Residuals, % | 0 | |
| 0 to 0.5 |