R30816 Cobalt vs. ZA-8
R30816 cobalt belongs to the cobalt alloys classification, while ZA-8 belongs to the zinc alloys. There are 26 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.
For each property being compared, the top bar is R30816 cobalt and the bottom bar is ZA-8.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 280 | |
| 87 to 100 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 85 to 86 |
| Elongation at Break, % | 23 | |
| 1.3 to 8.0 |
| Fatigue Strength, MPa | 250 | |
| 51 to 100 |
| Poisson's Ratio | 0.3 | |
| 0.26 |
| Shear Modulus, GPa | 81 | |
| 34 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 210 to 370 |
| Tensile Strength: Yield (Proof), MPa | 460 | |
| 210 to 290 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 110 |
| Melting Completion (Liquidus), °C | 1540 | |
| 400 |
| Melting Onset (Solidus), °C | 1460 | |
| 380 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 440 |
| Thermal Conductivity, W/m-K | 13 | |
| 120 |
| Thermal Expansion, µm/m-K | 12 | |
| 23 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 6.3 |
| Embodied Carbon, kg CO2/kg material | 20 | |
| 3.3 |
| Embodied Energy, MJ/kg | 320 | |
| 62 |
| Embodied Water, L/kg | 440 | |
| 420 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 190 | |
| 2.8 to 28 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 | |
| 260 to 490 |
| Stiffness to Weight: Axial, points | 13 | |
| 7.5 |
| Stiffness to Weight: Bending, points | 22 | |
| 23 |
| Strength to Weight: Axial, points | 31 | |
| 9.3 to 17 |
| Strength to Weight: Bending, points | 25 | |
| 12 to 18 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 42 |
| Thermal Shock Resistance, points | 28 | |
| 7.6 to 13 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 8.0 to 8.8 |
| Cadmium (Cd), % | 0 | |
| 0 to 0.0060 |
| Carbon (C), % | 0.32 to 0.42 | |
| 0 |
| Chromium (Cr), % | 19 to 21 | |
| 0 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0.8 to 1.3 |
| Iron (Fe), % | 0 to 5.0 | |
| 0 to 0.075 |
| Lead (Pb), % | 0 | |
| 0 to 0.0060 |
| Magnesium (Mg), % | 0 | |
| 0.015 to 0.030 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 0 to 0.020 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.045 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |
| Tantalum (Ta), % | 3.5 to 4.5 | |
| 0 |
| Tin (Sn), % | 0 | |
| 0 to 0.0030 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 89.7 to 91.2 |