AWS BAg-27 (P07251) Filler Metal
AWS BAg-27 is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BAg-27 is the AWS designation for this material. P07251 is the UNS number.
It has a fairly low melting temperature among silver-based braze fillers. In addition, it has a fairly high heat capacity and a fairly low density.
The graph bars on the material properties cards below compare AWS BAg-27 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
88 GPa 13 x 106 psi
Poisson's Ratio
0.32
Shear Modulus
33 GPa 4.8 x 106 psi
Tensile Strength: Ultimate (UTS)
160 MPa 23 x 103 psi
Thermal Properties
Brazing Temperature
710 to 860 °C 1310 to 1580 °F
Latent Heat of Fusion
140 J/g
Melting Completion (Liquidus)
750 °C 1370 °F
Melting Onset (Solidus)
610 °C 1120 °F
Specific Heat Capacity
330 J/kg-K 0.078 BTU/lb-°F
Thermal Expansion
22 µm/m-K
Otherwise Unclassified Properties
Density
8.7 g/cm3 540 lb/ft3
Embodied Carbon
25 kg CO2/kg material
Embodied Energy
400 MJ/kg 170 x 103 BTU/lb
Common Calculations
Stiffness to Weight: Axial
5.7 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 | 34 to 36 | |
| Zn | 24.5 to 28.5 | |
| Ag | 24 to 26 | |
| Cd | 12.5 to 14.5 | |
| 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