AWS BAg-20 (P07301) Filler Metal
AWS BAg-20 is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BAg-20 is the AWS designation for this material. P07301 is the UNS number.
It has a fairly low density and a very high heat capacity among silver-based braze fillers.
The graph bars on the material properties cards below compare AWS BAg-20 to: silver-based braze fillers (top), all alloys in the same category (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
93 GPa 14 x 106 psi
Poisson's Ratio
0.32
Shear Modulus
35 GPa 5.1 x 106 psi
Tensile Strength: Ultimate (UTS)
160 MPa 23 x 103 psi
Thermal Properties
Brazing Temperature
770 to 900 °C 1410 to 1650 °F
Latent Heat of Fusion
150 J/g
Melting Completion (Liquidus)
770 °C 1410 °F
Melting Onset (Solidus)
680 °C 1250 °F
Specific Heat Capacity
340 J/kg-K 0.082 BTU/lb-°F
Thermal Expansion
21 µm/m-K
Otherwise Unclassified Properties
Density
8.6 g/cm3 540 lb/ft3
Embodied Carbon
30 kg CO2/kg material
Embodied Energy
480 MJ/kg 210 x 103 BTU/lb
Common Calculations
Stiffness to Weight: Axial
6.0 points
Stiffness to Weight: Bending
17 points
Strength to Weight: Axial
5.1 points
Strength to Weight: Bending
7.6 points
Thermal Shock Resistance
5.9 points
Alloy Composition
| Cu | 37 to 39 | |
| Zn | 30 to 34 | |
| Ag | 29 to 31 | |
| res. | 0 to 0.15 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
AWS A5.8: Specification for Filler Metals for Brazing and Braze Welding