Precious Metal BAg15CuZnSn AS-BRAZED
Heat-treated state
GB GB/T 10046 BAg15CuZnSn
Reference for design verification: rate Cu/Cu or Cu/steel lap joints with a 0.05–0.15 mm gap by joint shear strength rather than by bulk filler or base-metal values.
Values for the AS-BRAZED condition
What is BAg15CuZnSn AS-BRAZED?
BAg15CuZnSn AS-BRAZED is BAg15CuZnSn heat treated to AS-BRAZED — reference for design verification: rate Cu/Cu or Cu/steel lap joints with a 0.05–0.15 mm gap by joint shear strength rather than by bulk filler or base-metal values. BAg15CuZnSn AS-BRAZED has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 250 MPa (36.3 ksi) — stronger than 70% of precious metal grades. Elongation at break is 22% and the elastic modulus is 95 GPa (13.8 Msi). BAg15CuZnSn AS-BRAZED has a density of 8.4 g/cm³ (0.303 lb/in³), lighter than 99% of precious metal grades. It melts at 640°C (1,184 °F).
Advantages
- Lightweight — 8.4 g/cm³ (0.303 lb/in³), better than 99% of precious metal grades
- Low embodied carbon — 20 kg CO₂/kg, better than 99% of precious metal grades
- Easy to machine — 60/100, better than 97% of precious metal grades
Limitations
- Needs corrosion protection — 48/100, worse than 99% of precious metal grades
- Difficult to weld — 10/100, worse than 99% of precious metal grades
- Limited service temperature — 200°C (392 °F), worse than 89% of precious metal grades
- Limited formability — 65/100, worse than 86% of precious metal grades
- Hard to polish — 70/100, worse than 76% of precious metal grades
BAg15CuZnSn AS-BRAZED properties
Typical room-temperature values for BAg15CuZnSn AS-BRAZED; 4 are specific to this condition. Other listed values are BAg15CuZnSn reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
BAg15CuZnSn AS-BRAZED has a density of 8.4 g/cm³ (0.303 lb/in³), lighter than 99% of precious metal grades. It melts at 640°C (1,184 °F).
Mechanical10
BAg15CuZnSn AS-BRAZED has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 250 MPa (36.3 ksi) — stronger than 70% of precious metal grades. Elongation at break is 22% and the elastic modulus is 95 GPa (13.8 Msi).
Thermal6
BAg15CuZnSn AS-BRAZED is rated for continuous service to 200°C (392 °F). It conducts heat at 80 W/m·K (46.2 BTU/hr·ft·°F), worse than 54% of precious metal grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
BAg15CuZnSn AS-BRAZED conducts electricity at 20 % IACS, better than 53% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is fair (48/100), worse than 99% of precious metal grades.
Sustainability4
Producing a kilogram of BAg15CuZnSn AS-BRAZED takes about 280 MJ of energy and emits 20 kg of CO₂ — less than 99% of precious metal grades. Typical recycled content is 35%.
Manufacturability6
BAg15CuZnSn AS-BRAZED's machinability is good (60/100, better than 97% of precious metal grades); weldability not recommended (10/100); formability good (65/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with BAg15CuZnSn AS-BRAZED
Is BAg15CuZnSn easy to machine?
Rarely machined; if preforms must be turned, run low speed with sharp high-positive-rake tools because the alloy smears and drags. Collect all chips and swarf for silver reclamation, since scrap is credited by weight.
Can BAg15CuZnSn be welded?
This is a braze filler, not a fusion welding consumable. When brazing, avoid overheating: excess heat volatilizes zinc and promotes Ag-Cu eutectic segregation, leaving a porous, weak fillet.
Can BAg15CuZnSn be formed, bent or molded?
Continuously cast stock draws to wire and rolls to strip, but work hardening is pronounced; interanneal at 550–600 °C and cool quickly before further reduction.
What surface finishes work on BAg15CuZnSn?
Borax-type flux residue must be removed completely with a hot water or dilute acid wash, otherwise the hygroscopic residue absorbs moisture and corrodes the joint. Fillets can be polished, or nickel/tin plated to mask the color difference against copper and brass.
BAg15CuZnSn 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 |
|---|---|---|
| Agnominal silver content 15% | 14 – 16 | 15 |
| Cu | 41 – 45 | 43 |
| Snlowers liquidus, improves flow, replaces Cd | 2 – 3 | 2.5 |
| Cdcadmium-free grade, Cd controlled as impurity | ≤ 0.01 | — |
| Pbimpurity | ≤ 0.03 | — |
| GB/T 10046 total impurity limit | ≤ 0.15 | — |
| Zn | balance | — |
BAg15CuZnSn AS-BRAZED — frequently asked
What is BAg15CuZnSn AS-BRAZED used for?
BAg15CuZnSn AS-BRAZED is typically used for refrigeration copper tube brazing, electrical connector brazing and general HVAC repair. In short: economy 15 % silver braze; cadmium-free copper brazing; tin-modified melting range.
What is the yield strength of BAg15CuZnSn AS-BRAZED?
BAg15CuZnSn AS-BRAZED has a typical yield strength of 230 MPa (33.4 ksi) and a tensile strength of 250 MPa (36.3 ksi) — stronger than 70% of precious metal grades.
Is BAg15CuZnSn AS-BRAZED easy to machine?
Reasonably — machinability is rated good (60/100, better than 97% of precious metal grades). Rarely machined; if preforms must be turned, run low speed with sharp high-positive-rake tools because the alloy smears and drags. Collect all chips and swarf for silver reclamation, since scrap is credited by weight.
Can BAg15CuZnSn AS-BRAZED be welded?
Not readily — weldability is rated not recommended (10/100). This is a braze filler, not a fusion welding consumable. When brazing, avoid overheating: excess heat volatilizes zinc and promotes Ag-Cu eutectic segregation, leaving a porous, weak fillet.
What surface finishes work on BAg15CuZnSn AS-BRAZED?
Borax-type flux residue must be removed completely with a hot water or dilute acid wash, otherwise the hygroscopic residue absorbs moisture and corrodes the joint. Fillets can be polished, or nickel/tin plated to mask the color difference against copper and brass.
Can BAg15CuZnSn AS-BRAZED be formed, bent or molded?
Continuously cast stock draws to wire and rolls to strip, but work hardening is pronounced; interanneal at 550–600 °C and cool quickly before further reduction.
What is the maximum service temperature of BAg15CuZnSn AS-BRAZED?
BAg15CuZnSn 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
- GB/T 10046 (2018)
- AWS A5.8/A5.8M Specification for Filler Metals for Brazing and Braze Welding — AWS (2019)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering (Silver brazing filler metals) — ASM International (1993)
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.