R30075 Cobalt vs. C68800 Brass
R30075 cobalt belongs to the cobalt alloys classification, while C68800 brass 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 R30075 cobalt and the bottom bar is C68800 brass.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 to 250 | |
| 110 |
| Elongation at Break, % | 12 | |
| 2.0 to 36 |
| Poisson's Ratio | 0.29 | |
| 0.32 |
| Shear Modulus, GPa | 82 to 98 | |
| 41 |
| Tensile Strength: Ultimate (UTS), MPa | 780 to 1280 | |
| 570 to 890 |
| Tensile Strength: Yield (Proof), MPa | 480 to 840 | |
| 390 to 790 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 190 |
| Melting Completion (Liquidus), °C | 1360 | |
| 960 |
| Melting Onset (Solidus), °C | 1290 | |
| 950 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 400 |
| Thermal Conductivity, W/m-K | 13 | |
| 40 |
| Thermal Expansion, µm/m-K | 12 | |
| 19 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 18 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 20 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 8.2 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 2.8 |
| Embodied Energy, MJ/kg | 110 | |
| 48 |
| Embodied Water, L/kg | 530 | |
| 350 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 84 to 140 | |
| 16 to 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 560 to 1410 | |
| 710 to 2860 |
| Stiffness to Weight: Axial, points | 14 to 17 | |
| 7.3 |
| Stiffness to Weight: Bending, points | 24 to 25 | |
| 19 |
| Strength to Weight: Axial, points | 26 to 42 | |
| 19 to 30 |
| Strength to Weight: Bending, points | 22 to 31 | |
| 19 to 25 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 12 |
| Thermal Shock Resistance, points | 21 to 29 | |
| 19 to 30 |
Alloy Composition
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| Aluminum (Al), % | 0 to 0.1 | |
| 3.0 to 3.8 |
| Boron (B), % | 0 to 0.010 | |
| 0 |
| Carbon (C), % | 0 to 0.35 | |
| 0 |
| Chromium (Cr), % | 27 to 30 | |
| 0 |
| Cobalt (Co), % | 58.7 to 68 | |
| 0.25 to 0.55 |
| Copper (Cu), % | 0 | |
| 70.8 to 75.5 |
| Iron (Fe), % | 0 to 0.75 | |
| 0 to 0.2 |
| Lead (Pb), % | 0 | |
| 0 to 0.050 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 0 |
| Nickel (Ni), % | 0 to 0.5 | |
| 0 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 |
| Titanium (Ti), % | 0 to 0.1 | |
| 0 |
| Tungsten (W), % | 0 to 0.2 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 21.3 to 24.1 |
| Residuals, % | 0 | |
| 0 to 0.5 |