R30021 Cobalt vs. C47940 Brass
R30021 cobalt belongs to the cobalt alloys classification, while C47940 brass belongs to the copper alloys. There are 24 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 R30021 cobalt and the bottom bar is C47940 brass.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 100 |
| Elongation at Break, % | 9.0 | |
| 14 to 34 |
| Poisson's Ratio | 0.29 | |
| 0.31 |
| Shear Modulus, GPa | 86 | |
| 40 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 380 to 520 |
| Tensile Strength: Yield (Proof), MPa | 500 | |
| 160 to 390 |
Thermal Properties
| Latent Heat of Fusion, J/g | 330 | |
| 170 |
| Melting Completion (Liquidus), °C | 1350 | |
| 850 |
| Melting Onset (Solidus), °C | 1190 | |
| 800 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 380 |
| Thermal Conductivity, W/m-K | 15 | |
| 110 |
| Thermal Expansion, µm/m-K | 11 | |
| 20 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 8.2 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 2.8 |
| Embodied Energy, MJ/kg | 110 | |
| 47 |
| Embodied Water, L/kg | 520 | |
| 330 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 57 | |
| 68 to 100 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 570 | |
| 120 to 740 |
| Stiffness to Weight: Axial, points | 15 | |
| 7.1 |
| Stiffness to Weight: Bending, points | 24 | |
| 19 |
| Strength to Weight: Axial, points | 23 | |
| 13 to 17 |
| Strength to Weight: Bending, points | 21 | |
| 14 to 17 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 36 |
| Thermal Shock Resistance, points | 21 | |
| 13 to 17 |
Alloy Composition
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| Carbon (C), % | 0.2 to 0.35 | |
| 0 |
| Chromium (Cr), % | 26 to 29 | |
| 0 |
| Cobalt (Co), % | 61.7 to 67.3 | |
| 0 |
| Copper (Cu), % | 0 | |
| 63 to 66 |
| Iron (Fe), % | 0 to 3.0 | |
| 0.1 to 1.0 |
| Lead (Pb), % | 0 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 4.5 to 6.0 | |
| 0 |
| Nickel (Ni), % | 2.0 to 3.0 | |
| 0.1 to 0.5 |
| Silicon (Si), % | 0 to 1.5 | |
| 0 |
| Tin (Sn), % | 0 | |
| 1.2 to 2.0 |
| Zinc (Zn), % | 0 | |
| 28.1 to 34.6 |
| Residuals, % | 0 | |
| 0 to 0.4 |