R30155 Cobalt vs. ZA-8
R30155 cobalt belongs to the iron alloys classification, while ZA-8 belongs to the zinc alloys. There are 29 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.
For each property being compared, the top bar is R30155 cobalt and the bottom bar is ZA-8.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 220 | |
| 87 to 100 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 85 to 86 |
| Elongation at Break, % | 34 | |
| 1.3 to 8.0 |
| Fatigue Strength, MPa | 310 | |
| 51 to 100 |
| Poisson's Ratio | 0.29 | |
| 0.26 |
| Shear Modulus, GPa | 81 | |
| 34 |
| Shear Strength, MPa | 570 | |
| 240 to 280 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 210 to 370 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 210 to 290 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 110 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 100 |
| Melting Completion (Liquidus), °C | 1470 | |
| 400 |
| Melting Onset (Solidus), °C | 1420 | |
| 380 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 440 |
| Thermal Conductivity, W/m-K | 12 | |
| 120 |
| Thermal Expansion, µm/m-K | 14 | |
| 23 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 80 | |
| 11 |
| Density, g/cm3 | 8.5 | |
| 6.3 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 3.3 |
| Embodied Energy, MJ/kg | 150 | |
| 62 |
| Embodied Water, L/kg | 300 | |
| 420 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
| 2.8 to 28 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 370 | |
| 260 to 490 |
| Stiffness to Weight: Axial, points | 14 | |
| 7.5 |
| Stiffness to Weight: Bending, points | 23 | |
| 23 |
| Strength to Weight: Axial, points | 28 | |
| 9.3 to 17 |
| Strength to Weight: Bending, points | 24 | |
| 12 to 18 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 42 |
| Thermal Shock Resistance, points | 21 | |
| 7.6 to 13 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 8.0 to 8.8 |
| Cadmium (Cd), % | 0 | |
| 0 to 0.0060 |
| Carbon (C), % | 0.080 to 0.16 | |
| 0 |
| Chromium (Cr), % | 20 to 22.5 | |
| 0 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0.8 to 1.3 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 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), % | 2.5 to 3.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 0 to 0.020 |
| Niobium (Nb), % | 0.75 to 1.3 | |
| 0 |
| Nitrogen (N), % | 0 to 0.2 | |
| 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), % | 0.75 to 1.3 | |
| 0 |
| Tin (Sn), % | 0 | |
| 0 to 0.0030 |
| Tungsten (W), % | 2.0 to 3.0 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 89.7 to 91.2 |