R30816 Cobalt vs. C84400 Valve Metal
R30816 cobalt belongs to the cobalt alloys classification, while C84400 valve metal belongs to the copper alloys. There are 24 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 R30816 cobalt and the bottom bar is C84400 valve metal.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 100 |
| Elongation at Break, % | 23 | |
| 19 |
| Poisson's Ratio | 0.3 | |
| 0.34 |
| Shear Modulus, GPa | 81 | |
| 39 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 230 |
| Tensile Strength: Yield (Proof), MPa | 460 | |
| 110 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 180 |
| Melting Completion (Liquidus), °C | 1540 | |
| 1000 |
| Melting Onset (Solidus), °C | 1460 | |
| 840 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 370 |
| Thermal Conductivity, W/m-K | 13 | |
| 72 |
| Thermal Expansion, µm/m-K | 12 | |
| 19 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 8.8 |
| Embodied Carbon, kg CO2/kg material | 20 | |
| 2.8 |
| Embodied Energy, MJ/kg | 320 | |
| 46 |
| Embodied Water, L/kg | 440 | |
| 340 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 190 | |
| 36 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 | |
| 58 |
| Stiffness to Weight: Axial, points | 13 | |
| 6.6 |
| Stiffness to Weight: Bending, points | 22 | |
| 18 |
| Strength to Weight: Axial, points | 31 | |
| 7.2 |
| Strength to Weight: Bending, points | 25 | |
| 9.4 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 22 |
| Thermal Shock Resistance, points | 28 | |
| 8.3 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.0050 |
| Antimony (Sb), % | 0 | |
| 0 to 0.25 |
| Carbon (C), % | 0.32 to 0.42 | |
| 0 |
| Chromium (Cr), % | 19 to 21 | |
| 0 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Copper (Cu), % | 0 | |
| 78 to 82 |
| Iron (Fe), % | 0 to 5.0 | |
| 0 to 0.4 |
| Lead (Pb), % | 0 | |
| 6.0 to 8.0 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 0 to 1.0 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 1.5 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.0050 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.080 |
| Tantalum (Ta), % | 3.5 to 4.5 | |
| 0 |
| Tin (Sn), % | 0 | |
| 2.3 to 3.5 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 7.0 to 10 |
| Residuals, % | 0 | |
| 0 to 0.7 |