AWS BVAu-2 vs. AWS BVAg-31
Both AWS BVAu-2 and AWS BVAg-31 are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a modest 20% of their average alloy composition in common, which, by itself, doesn't mean much.
For each property being compared, the top bar is AWS BVAu-2 and the bottom bar is AWS BVAg-31.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 100 | |
| 90 |
| Poisson's Ratio | 0.4 | |
| 0.36 |
| Shear Modulus, GPa | 36 | |
| 33 |
| Tensile Strength: Ultimate (UTS), MPa | 150 | |
| 180 |
Thermal Properties
| Brazing Temperature, °C | 890 to 1010 | |
| 850 to 890 |
| Latent Heat of Fusion, J/g | 92 | |
| 150 |
| Melting Completion (Liquidus), °C | 890 | |
| 850 |
| Melting Onset (Solidus), °C | 890 | |
| 820 |
| Specific Heat Capacity, J/kg-K | 180 | |
| 280 |
| Thermal Expansion, µm/m-K | 15 | |
| 18 |
Otherwise Unclassified Properties
| Density, g/cm3 | 17 | |
| 10 |
Common Calculations
| Stiffness to Weight: Axial, points | 3.3 | |
| 4.9 |
| Stiffness to Weight: Bending, points | 9.1 | |
| 15 |
| Strength to Weight: Axial, points | 2.4 | |
| 4.9 |
| Strength to Weight: Bending, points | 3.6 | |
| 7.0 |
| Thermal Shock Resistance, points | 7.1 | |
| 7.8 |
Alloy Composition
| Cadmium (Cd), % | 0 to 0.0010 | |
| 0 to 0.0010 |
| Carbon (C), % | 0 to 0.0050 | |
| 0 to 0.0050 |
| Copper (Cu), % | 19.5 to 20.5 | |
| 31 to 33 |
| Gold (Au), % | 79.5 to 80.5 | |
| 0 |
| Lead (Pb), % | 0 to 0.0020 | |
| 0 to 0.0020 |
| Palladium (Pd), % | 0 | |
| 8.0 to 12 |
| Phosphorus (P), % | 0 to 0.0020 | |
| 0 to 0.0020 |
| Silver (Ag), % | 0 | |
| 57 to 59 |
| Zinc (Zn), % | 0 to 0.0010 | |
| 0 to 0.0010 |