AWS BCo-1 vs. ZA-8
AWS BCo-1 belongs to the cobalt alloys classification, while ZA-8 belongs to the zinc alloys. There are 18 material properties with values for both materials. Properties with values for just one material (19, in this case) are not shown.
For each property being compared, the top bar is AWS BCo-1 and the bottom bar is ZA-8.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 85 to 86 |
| Poisson's Ratio | 0.3 | |
| 0.26 |
| Shear Modulus, GPa | 78 | |
| 34 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 210 to 370 |
Thermal Properties
| Latent Heat of Fusion, J/g | 420 | |
| 110 |
| Melting Completion (Liquidus), °C | 1150 | |
| 400 |
| Melting Onset (Solidus), °C | 1120 | |
| 380 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 440 |
| Thermal Expansion, µm/m-K | 12 | |
| 23 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.1 | |
| 6.3 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 3.3 |
| Embodied Energy, MJ/kg | 110 | |
| 62 |
| Embodied Water, L/kg | 430 | |
| 420 |
Common Calculations
| Stiffness to Weight: Axial, points | 14 | |
| 7.5 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 |
| Strength to Weight: Axial, points | 24 | |
| 9.3 to 17 |
| Strength to Weight: Bending, points | 22 | |
| 12 to 18 |
| Thermal Shock Resistance, points | 21 | |
| 7.6 to 13 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.050 | |
| 8.0 to 8.8 |
| Boron (B), % | 0.7 to 0.9 | |
| 0 |
| Cadmium (Cd), % | 0 | |
| 0 to 0.0060 |
| Carbon (C), % | 0.35 to 0.45 | |
| 0 |
| Chromium (Cr), % | 18 to 20 | |
| 0 |
| Cobalt (Co), % | 46 to 54 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0.8 to 1.3 |
| Iron (Fe), % | 0 to 1.0 | |
| 0 to 0.075 |
| Lead (Pb), % | 0 | |
| 0 to 0.0060 |
| Magnesium (Mg), % | 0 | |
| 0.015 to 0.030 |
| Nickel (Ni), % | 16 to 18 | |
| 0 to 0.020 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 |
| Selenium (Se), % | 0 to 0.0050 | |
| 0 |
| Silicon (Si), % | 7.5 to 8.5 | |
| 0 to 0.045 |
| Sulfur (S), % | 0 to 0.020 | |
| 0 |
| Tin (Sn), % | 0 | |
| 0 to 0.0030 |
| Titanium (Ti), % | 0 to 0.050 | |
| 0 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 89.7 to 91.2 |
| Zirconium (Zr), % | 0 to 0.050 | |
| 0 |
| Residuals, % | 0 to 0.5 | |
| 0 |