Precious Metal BAg-8a AS-BRAZED
Heat-treated state
UNS P07723
Property set for design of the finished joint rather than the supplied filler stock.
Values for the AS-BRAZED condition
What is BAg-8a AS-BRAZED?
BAg-8a AS-BRAZED is BAg-8a heat treated to AS-BRAZED — property set for design of the finished joint rather than the supplied filler stock. BAg-8a AS-BRAZED has a yield strength of 180 MPa (26.1 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 59% of precious metal grades. Elongation at break is 15% and the elastic modulus is 85 GPa (12.3 Msi). BAg-8a AS-BRAZED has a density of 9.9 g/cm³ (0.358 lb/in³), lighter than 70% of precious metal grades. It melts at 766°C (1,411 °F).
Advantages
- High electrical conductivity — 87 % IACS, better than 93% of precious metal grades
- Conducts heat well — 350 W/m·K (202.2 BTU/hr·ft·°F), better than 89% of precious metal grades
Limitations
- Limited ductility — 15%, worse than 86% of precious metal grades
- Difficult to machine — 30/100, worse than 86% of precious metal grades
- Difficult to weld — 20/100, worse than 86% of precious metal grades
BAg-8a AS-BRAZED properties
Typical room-temperature values for BAg-8a AS-BRAZED; 4 are specific to this condition. Other listed values are BAg-8a reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
BAg-8a AS-BRAZED has a density of 9.9 g/cm³ (0.358 lb/in³), lighter than 70% of precious metal grades. It melts at 766°C (1,411 °F).
Mechanical10
BAg-8a AS-BRAZED has a yield strength of 180 MPa (26.1 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 59% of precious metal grades. Elongation at break is 15% and the elastic modulus is 85 GPa (12.3 Msi).
Thermal6
BAg-8a AS-BRAZED is rated for continuous service to 370°C (698 °F). It conducts heat at 350 W/m·K (202.2 BTU/hr·ft·°F), better than 89% of precious metal grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
BAg-8a AS-BRAZED conducts electricity at 87 % IACS, better than 93% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is good (68/100), worse than 74% of precious metal grades.
Sustainability4
Producing a kilogram of BAg-8a AS-BRAZED takes about 1,050 MJ of energy and emits 80 kg of CO₂ — less than 75% of precious metal grades. Typical recycled content is 45%.
Manufacturability7
BAg-8a AS-BRAZED's machinability is poor (30/100, worse than 86% of precious metal grades); weldability poor (20/100); formability excellent (85/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with BAg-8a AS-BRAZED
Is BAg-8a easy to machine?
Rarely machined; the soft eutectic is gummy — use sharp high-rake tools, light feeds and good lubrication if trimming preforms.
Can BAg-8a be welded?
Not a structural weld metal; it is the filler itself — braze in vacuum (10⁻⁴ mbar) or dry hydrogen/argon at 771–816 °C with 0.03–0.08 mm joint clearance and no flux.
Can BAg-8a be formed, bent or molded?
Excellent cold ductility: drawn to fine wire, rolled to 0.05 mm foil and stamped into rings; anneal between heavy reductions.
What surface finishes work on BAg-8a?
As-brazed fillets are bright and need no cleaning; store filler in sealed dry packs because the lithium addition tarnishes quickly, and degrease before use rather than pickling.
BAg-8a 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 / ASTM B260, UNS P07723 | 71 – 73 | 72 |
| Lioxide-reducing (self-fluxing) addition | 0.15 – 0.3 | 0.22 |
| Other (total)total of all other elements, max | ≤ 0.15 | |
| Cdcadmium-free grade | ≤ 0 | 0 |
| Curemainder, nominally ~27.8% | balance |
BAg-8a AS-BRAZED — frequently asked
What is BAg-8a AS-BRAZED used for?
BAg-8a AS-BRAZED is typically used for stainless steel furnace brazing without flux, vacuum and controlled-atmosphere brazing and honeycomb structure joining. In short: self-fluxing lithium eutectic; flux-free furnace brazing; rolls to 0.05 mm foil.
What is the yield strength of BAg-8a AS-BRAZED?
BAg-8a AS-BRAZED has a typical yield strength of 180 MPa (26.1 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 59% of precious metal grades.
Is BAg-8a AS-BRAZED easy to machine?
Not especially — machinability is rated poor (30/100, worse than 86% of precious metal grades). Rarely machined; the soft eutectic is gummy — use sharp high-rake tools, light feeds and good lubrication if trimming preforms.
Can BAg-8a AS-BRAZED be welded?
Not readily — weldability is rated poor (20/100). Not a structural weld metal; it is the filler itself — braze in vacuum (10⁻⁴ mbar) or dry hydrogen/argon at 771–816 °C with 0.03–0.08 mm joint clearance and no flux.
What surface finishes work on BAg-8a AS-BRAZED?
As-brazed fillets are bright and need no cleaning; store filler in sealed dry packs because the lithium addition tarnishes quickly, and degrease before use rather than pickling.
Can BAg-8a AS-BRAZED be formed, bent or molded?
Excellent cold ductility: drawn to fine wire, rolled to 0.05 mm foil and stamped into rings; anneal between heavy reductions.
What is the maximum service temperature of BAg-8a AS-BRAZED?
BAg-8a AS-BRAZED 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.
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 (2020)
- Brazing Handbook, 5th ed. — American Welding Society (2007)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering — ASM International (1993)
- Silver brazing alloy technical data (Ag-Cu eutectic and Li-bearing grades) — Lucas-Milhaupt / Handy & Harman (2020)
- 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.