Precious Metal BAg-6
UNS P07503 · GB BAg50CuZn
BAg-6 (UNS P07503, BAg50CuZn) is a cadmium-free 50% silver Ag-Cu-Zn brazing filler with a higher liquidus than BAg-5, used where slightly higher-temperature service and good ductility are needed without cadmium.
Reference datasheet — BAg-6 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the AS-BRAZED condition
BAg-6 tempers and conditions
BAg-6 is supplied in one standard condition, AS-BRAZED. AS-BRAZED is the default FabDigit quotes; the values on this page are for it.
Supply forms, finishes and certifications
Ways BAg-6 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
FLUX-COATED | Flux-Coated Rod | Supply form |
POWDER-PASTE | Powder / Paste | Supply form |
STRIP-ANN | Strip / Preform | Supply form |
WIRE-ROD | Wire / Rod | Supply form |
What is BAg-6?
BAg-6 (UNS P07503, BAg50CuZn) is a cadmium-free 50% silver Ag-Cu-Zn brazing filler with a higher liquidus than BAg-5, used where slightly higher-temperature service and good ductility are needed without cadmium. Typical as-brazed values are 410 MPa tensile, 220 MPa yield and 30% elongation, with joints rated to a maximum service temperature of 370 °C; forms include wire and rod, annealed strip, flux-coated rod, powder and paste. It brazes at 774-870 °C with an AWS FB3-A flux, and the zinc content rules out vacuum brazing - use BAg-8a or BVAg-0 for that. BAg-6 has a density of 9.1 g/cm³ (0.329 lb/in³), lighter than 89% of precious metal grades. It melts at 690°C (1,274 °F). BAg-6 has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 410 MPa (59.5 ksi) — stronger than 67% of precious metal grades. Elongation at break is 30% and the elastic modulus is 85 GPa (12.3 Msi).
What is BAg-6 used for?
- stainless steel and copper alloy joints
- instrumentation brazing
- general fabrication
Advantages
- Lightweight — 9.1 g/cm³ (0.329 lb/in³), better than 89% of precious metal grades
- Easy to machine — 55/100, better than 86% of precious metal grades
- Low embodied carbon — 60 kg CO₂/kg, better than 82% of precious metal grades
Limitations
- Needs corrosion protection — 65/100, worse than 77% of precious metal grades
- Hard to polish — 70/100, worse than 76% of precious metal grades
BAg-6 properties
Typical room-temperature values for BAg-6-AS-BRAZED; bars are the position among precious metal grades.
Physical3
BAg-6 has a density of 9.1 g/cm³ (0.329 lb/in³), lighter than 89% of precious metal grades. It melts at 690°C (1,274 °F).
Mechanical9
BAg-6 has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 410 MPa (59.5 ksi) — stronger than 67% of precious metal grades. Elongation at break is 30% and the elastic modulus is 85 GPa (12.3 Msi).
Thermal6
BAg-6 is rated for continuous service to 370°C (698 °F). It conducts heat at 100 W/m·K (57.8 BTU/hr·ft·°F), better than 55% of precious metal grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
BAg-6 conducts electricity at 21 % IACS, better than 57% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), worse than 77% of precious metal grades.
Sustainability3
Producing a kilogram of BAg-6 takes about 800 MJ of energy and emits 60 kg of CO₂ — less than 83% of precious metal grades. Typical recycled content is 40%.
Manufacturability6
BAg-6's machinability is good (55/100, better than 86% of precious metal grades); formability very good (80/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the precious metal family
Yield strength against density for every precious metal grade FabDigit runs. BAg-6 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with BAg-6
Is BAg-6 easy to machine?
Not normally used as a machined part. If fillets or preforms must be trimmed, use sharp tools with high rake angles and low speeds, since the alloy is tough and sticks to the cutting edge.
Can BAg-6 be welded?
This is the filler metal itself: braze by torch, induction or furnace (protective atmosphere) at 774-870 °C. The zinc content makes it unsuitable for vacuum brazing; use an AWS FB3-A silver brazing flux and heat quickly to limit zinc evaporation.
Can BAg-6 be formed, bent or molded?
Ductility in the annealed condition is high - the alloy can be cold-drawn to wire, rolled to strip and stamped into brazing rings. Intermediate anneal at 600-650 °C after heavy cold work.
BAg-6 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-6 / UNS P07503 | 49 – 51 | 50 |
| Cu | 33 – 35 | 34 |
| Cdcadmium-free grade; Cd limited as an impurity | ≤ 0.01 | 0 |
| Other (total)total impurities | ≤ 0.15 | |
| Znbalance, about 14-18% | balance |
What surface finishes work on BAg-6?
Remove all residual flux after brazing with hot water or pickling. Joints can be polished, nickel plated or gold plated to prevent sulfide tarnish.
Equivalent designations
Standards and trade names that resolve to Precious Metal BAg-6 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- P07503
- GB (China)
- BAg50CuZn
How much does BAg-6 cost?
BAg-6 is a high-cost precious metal ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
BAg-6 — frequently asked
What is BAg-6 used for?
BAg-6 is typically used for stainless steel and copper alloy joints, instrumentation brazing and general fabrication. In short: 50% silver, cadmium-free; higher liquidus than BAg-5; ductile at 30% elongation.
What is the yield strength of BAg-6?
BAg-6 has a typical yield strength of 220 MPa (31.9 ksi) and a tensile strength of 410 MPa (59.5 ksi) — stronger than 67% of precious metal grades.
Is BAg-6 easy to machine?
Reasonably — machinability is rated good (55/100, better than 86% of precious metal grades). Not normally used as a machined part. If fillets or preforms must be trimmed, use sharp tools with high rake angles and low speeds, since the alloy is tough and sticks to the cutting edge.
Can BAg-6 be welded?
This is the filler metal itself: braze by torch, induction or furnace (protective atmosphere) at 774-870 °C. The zinc content makes it unsuitable for vacuum brazing; use an AWS FB3-A silver brazing flux and heat quickly to limit zinc evaporation.
What surface finishes work on BAg-6?
Remove all residual flux after brazing with hot water or pickling. Joints can be polished, nickel plated or gold plated to prevent sulfide tarnish.
Can BAg-6 be formed, bent or molded?
Ductility in the annealed condition is high - the alloy can be cold-drawn to wire, rolled to strip and stamped into brazing rings. Intermediate anneal at 600-650 °C after heavy cold work.
What is the maximum service temperature of BAg-6?
BAg-6 is rated for continuous use to about 370°C (698 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does BAg-6 cost?
BAg-6 is a high-cost precious metal ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- AWS A5.8M/A5.8 Specification for Filler Metals for Brazing and Braze Welding — AWS (2019)
- GB/T 10046 (2018)
- ASM Handbook Vol.6 — Brazing (Silver Filler Metals) — ASM International (1993)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.