Precious Metal BAg-7 AS-BRAZED
Heat-treated state
GB BAg56CuZnSn
Reference condition for joint design: strength governed by joint clearance (0.05–0.13 mm) and base-metal interaction.
Values for the AS-BRAZED condition
What is BAg-7 AS-BRAZED?
BAg-7 AS-BRAZED is BAg-7 heat treated to AS-BRAZED — reference condition for joint design: strength governed by joint clearance (0.05–0.13 mm) and base-metal interaction. BAg-7 AS-BRAZED has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 89% of precious metal grades. Elongation at break is 30% and the elastic modulus is 85 GPa (12.3 Msi). BAg-7 AS-BRAZED has a density of 9.5 g/cm³ (0.343 lb/in³), lighter than 81% of precious metal grades. It melts at 618°C (1,144 °F).
Advantages
- High strength — 290 MPa (42.1 ksi), better than 89% of precious metal grades
- Easy to machine — 55/100, better than 86% of precious metal grades
- Low embodied carbon — 65 kg CO₂/kg, better than 78% of precious metal grades
Limitations
- Limited service temperature — 200°C (392 °F), worse than 89% of precious metal grades
- Hard to polish — 70/100, worse than 76% of precious metal grades
BAg-7 AS-BRAZED properties
Typical room-temperature values for BAg-7 AS-BRAZED; 5 are specific to this condition. Other listed values are BAg-7 reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
BAg-7 AS-BRAZED has a density of 9.5 g/cm³ (0.343 lb/in³), lighter than 81% of precious metal grades. It melts at 618°C (1,144 °F).
Mechanical9
BAg-7 AS-BRAZED has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 89% of precious metal grades. Elongation at break is 30% and the elastic modulus is 85 GPa (12.3 Msi).
Thermal6
BAg-7 AS-BRAZED is rated for continuous service to 200°C (392 °F). It conducts heat at 70 W/m·K (40.4 BTU/hr·ft·°F), worse than 63% of precious metal grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
BAg-7 AS-BRAZED conducts electricity at 22 % IACS, better than 61% of precious metal grades.
Chemical & Environmental2
Corrosion resistance is good (68/100), worse than 74% of precious metal grades.
Sustainability3
Producing a kilogram of BAg-7 AS-BRAZED takes about 950 MJ of energy and emits 65 kg of CO₂ — less than 77% of precious metal grades. Typical recycled content is 45%.
Manufacturability6
BAg-7 AS-BRAZED's machinability is good (55/100, better than 86% of precious metal grades); weldability poor (30/100); formability very good (80/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with BAg-7 AS-BRAZED
Is BAg-7 easy to machine?
Rarely machined; the alloy is soft and gummy — use sharp tools, positive rake and light feeds if trimming preforms.
Can BAg-7 be welded?
Not a weldable structural alloy; it is itself a brazing filler — avoid arc processes that vaporize zinc.
Can BAg-7 be formed, bent or molded?
Readily drawn to fine wire and rolled to foil; anneal between heavy reductions before bending rings or shims.
What surface finishes work on BAg-7?
Brazed joints are silver-bright but tarnish in sulfur atmospheres; remove flux residue with hot water/citric-acid pickle, then polish or plate as needed.
BAg-7 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| AgAWS A5.8 BAg-7 | 55 – 57 | 56 |
| Cu | 21 – 23 | 22 |
| Snlowers melting range, improves wetting | 4.5 – 5.5 | 5 |
| Cdcadmium-free limit | ≤ 0.01 | |
| Other (total)total of unspecified elements | ≤ 0.15 | |
| Znbalance in most specifications | ≥ 15 (balance) |
BAg-7 AS-BRAZED — frequently asked
What is BAg-7 AS-BRAZED used for?
BAg-7 AS-BRAZED is typically used for refrigeration systems, electrical contact assembly and instrument brazing. In short: lower-melting cadmium-free filler; tin-bearing, free-wetting; 56 % Ag electrical-grade filler.
What is the yield strength of BAg-7 AS-BRAZED?
BAg-7 AS-BRAZED has a typical yield strength of 290 MPa (42.1 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 89% of precious metal grades.
Is BAg-7 AS-BRAZED easy to machine?
Reasonably — machinability is rated good (55/100, better than 86% of precious metal grades). Rarely machined; the alloy is soft and gummy — use sharp tools, positive rake and light feeds if trimming preforms.
Can BAg-7 AS-BRAZED be welded?
Not readily — weldability is rated poor (30/100). Not a weldable structural alloy; it is itself a brazing filler — avoid arc processes that vaporize zinc.
What surface finishes work on BAg-7 AS-BRAZED?
Brazed joints are silver-bright but tarnish in sulfur atmospheres; remove flux residue with hot water/citric-acid pickle, then polish or plate as needed.
Can BAg-7 AS-BRAZED be formed, bent or molded?
Readily drawn to fine wire and rolled to foil; anneal between heavy reductions before bending rings or shims.
What is the maximum service temperature of BAg-7 AS-BRAZED?
BAg-7 AS-BRAZED is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- AWS A5.8M/A5.8 Specification for Filler Metals for Brazing and Braze Welding — American Welding Society (2019)
- GB/T 10046 (2018)
- ASM Handbook Vol. 6 — Welding, Brazing, and Soldering (Brazing Filler Metals) — ASM International (1993)
- Silvaloy / Braze 560 (BAg-7) technical data — Lucas-Milhaupt (Handy & Harman) (2021)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.