Precious Metal BAg-4-ANN (Annealed)
Heat-treated state
UNS P07400 · GB BAg40CuZnNi
Pick when the filler must be bent, coiled tightly or formed into rings/preforms without cracking.
Values for the ANN condition
What is BAg-4-ANN?
BAg-4-ANN is BAg-4 heat treated to ANN — pick when the filler must be bent, coiled tightly or formed into rings/preforms without cracking. BAg-4-ANN has a yield strength of 200 MPa (29 ksi) and a tensile strength of 400 MPa (58 ksi) — stronger than 51% of precious metal grades. Elongation at break is 28% and the elastic modulus is 90 GPa (13.1 Msi). BAg-4-ANN has a density of 9.1 g/cm³ (0.329 lb/in³), lighter than 89% of precious metal grades. It melts at 671°C (1,240 °F).
Advantages
- Low embodied carbon — 48 kg CO₂/kg, better than 92% of precious metal grades
- Lightweight — 9.1 g/cm³ (0.329 lb/in³), better than 89% of precious metal grades
Limitations
- Difficult to weld — 20/100, worse than 86% of precious metal grades
- Needs corrosion protection — 62/100, worse than 83% of precious metal grades
- Poor heat conductor — 55 W/m·K (31.8 BTU/hr·ft·°F), worse than 76% of precious metal grades
- Hard to polish — 70/100, worse than 76% of precious metal grades
BAg-4-ANN properties
Typical room-temperature values for BAg-4-ANN; 5 are specific to this condition. Other listed values are BAg-4 reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
BAg-4-ANN has a density of 9.1 g/cm³ (0.329 lb/in³), lighter than 89% of precious metal grades. It melts at 671°C (1,240 °F).
Mechanical9
BAg-4-ANN has a yield strength of 200 MPa (29 ksi) and a tensile strength of 400 MPa (58 ksi) — stronger than 51% of precious metal grades. Elongation at break is 28% and the elastic modulus is 90 GPa (13.1 Msi).
Thermal5
BAg-4-ANN is rated for continuous service to 350°C (662 °F). It conducts heat at 55 W/m·K (31.8 BTU/hr·ft·°F), worse than 76% of precious metal grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
BAg-4-ANN conducts electricity at 15 % IACS, worse than 65% of precious metal grades.
Chemical & Environmental2
Corrosion resistance is good (62/100), worse than 83% of precious metal grades.
Sustainability3
Producing a kilogram of BAg-4-ANN takes about 720 MJ of energy and emits 48 kg of CO₂ — less than 87% of precious metal grades. Typical recycled content is 45%.
Manufacturability6
BAg-4-ANN's machinability is fair (45/100, better than 59% of precious metal grades); weldability poor (20/100); 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-4-ANN
Is BAg-4 easy to machine?
Rarely machined; the alloy is gummy and smears — use sharp HSS tooling, and dress solidified fillets with abrasives instead of cutting.
Can BAg-4 be welded?
Not a fusion-weld filler — arc heat volatilizes zinc; joints are made by torch, induction, furnace (air/inert with flux) or resistance brazing at 780–900 °C.
Can BAg-4 be formed, bent or molded?
Readily cold-drawn to fine wire and rolled to strip/preforms; interanneal to avoid cracking in tight bends.
What surface finishes work on BAg-4?
Fillets polish to a bright silver colour, accept nickel/chrome plating after thorough flux-residue removal in hot water or 5–10% citric/sulfuric pickle.
BAg-4 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 |
|---|---|---|
| Ag | 39 – 41 | 40 |
| Cu | 29 – 31 | 30 |
| Niimproves wetting of stainless steel and cemented carbide | 1.5 – 2.5 | 2 |
| Cdcadmium-free grade, impurity limit | ≤ 0.01 | |
| Other (total)total of other elements per AWS A5.8 | ≤ 0.15 | |
| Znbalance, nominally 26–30% | balance |
BAg-4-ANN — frequently asked
What is BAg-4-ANN used for?
BAg-4-ANN is typically used for stainless steel fabrication, carbide tooling, food-service equipment and general gap-filling joints. In short: nickel-bearing, wets carbide; wide melting range for gaps; cadmium-free 40% silver.
What is the yield strength of BAg-4-ANN?
BAg-4-ANN has a typical yield strength of 200 MPa (29 ksi) and a tensile strength of 400 MPa (58 ksi) — stronger than 51% of precious metal grades.
Is BAg-4-ANN easy to machine?
Reasonably — machinability is rated fair (45/100, better than 59% of precious metal grades). Rarely machined; the alloy is gummy and smears — use sharp HSS tooling, and dress solidified fillets with abrasives instead of cutting.
Can BAg-4-ANN be welded?
Not readily — weldability is rated poor (20/100). Not a fusion-weld filler — arc heat volatilizes zinc; joints are made by torch, induction, furnace (air/inert with flux) or resistance brazing at 780–900 °C.
What surface finishes work on BAg-4-ANN?
Fillets polish to a bright silver colour, accept nickel/chrome plating after thorough flux-residue removal in hot water or 5–10% citric/sulfuric pickle.
Can BAg-4-ANN be formed, bent or molded?
Readily cold-drawn to fine wire and rolled to strip/preforms; interanneal to avoid cracking in tight bends.
What is the maximum service temperature of BAg-4-ANN?
BAg-4-ANN is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- AWS A5.8/A5.8M Specification for Filler Metals for Brazing and Braze Welding — American Welding Society (2019)
- ASTM B260 Standard Specification for Brazing Filler Metal — ASTM International (2022)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering (brazing filler metal data) — ASM International (1993)
- Silver brazing alloy technical data (BAg series) — Lucas-Milhaupt / Handy & Harman (2022)
- GB/T 10046 (2018)
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.