R30008 Cobalt vs. ZA-8
R30008 cobalt belongs to the cobalt alloys classification, while ZA-8 belongs to the zinc alloys. There are 23 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.
For each property being compared, the top bar is R30008 cobalt and the bottom bar is ZA-8.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 85 to 86 |
| Elongation at Break, % | 1.1 to 73 | |
| 1.3 to 8.0 |
| Fatigue Strength, MPa | 320 to 530 | |
| 51 to 100 |
| Poisson's Ratio | 0.29 | |
| 0.26 |
| Shear Modulus, GPa | 83 | |
| 34 |
| Tensile Strength: Ultimate (UTS), MPa | 950 to 1700 | |
| 210 to 370 |
| Tensile Strength: Yield (Proof), MPa | 500 to 1080 | |
| 210 to 290 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 110 |
| Melting Completion (Liquidus), °C | 1400 | |
| 400 |
| Melting Onset (Solidus), °C | 1330 | |
| 380 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 440 |
| Thermal Expansion, µm/m-K | 13 | |
| 23 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 95 | |
| 11 |
| Density, g/cm3 | 8.4 | |
| 6.3 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 3.3 |
| Embodied Energy, MJ/kg | 110 | |
| 62 |
| Embodied Water, L/kg | 400 | |
| 420 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 590 to 2720 | |
| 260 to 490 |
| Stiffness to Weight: Axial, points | 14 | |
| 7.5 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 |
| Strength to Weight: Axial, points | 31 to 56 | |
| 9.3 to 17 |
| Strength to Weight: Bending, points | 25 to 37 | |
| 12 to 18 |
| Thermal Shock Resistance, points | 25 to 44 | |
| 7.6 to 13 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 8.0 to 8.8 |
| Boron (B), % | 0 to 0.0010 | |
| 0 |
| Cadmium (Cd), % | 0 | |
| 0 to 0.0060 |
| Carbon (C), % | 0 to 0.15 | |
| 0 |
| Chromium (Cr), % | 18.5 to 21.5 | |
| 0 |
| Cobalt (Co), % | 39 to 42 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0.8 to 1.3 |
| Iron (Fe), % | 7.6 to 20 | |
| 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), % | 6.5 to 7.5 | |
| 0 |
| Nickel (Ni), % | 15 to 18 | |
| 0 to 0.020 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 |
| Silicon (Si), % | 0 to 1.2 | |
| 0 to 0.045 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 |
| Tin (Sn), % | 0 | |
| 0 to 0.0030 |
| Zinc (Zn), % | 0 | |
| 89.7 to 91.2 |