Precious Metal BAg-2a ASBRAZED
Heat-treated state
UNS P07300
Use for joint strength verification of the solidified filler at 380 MPa tensile and 200 °C maximum service; with overlap of at least 3t the joint is normally governed by the base metal.
Values for the ASBRAZED condition
What is BAg-2a ASBRAZED?
BAg-2a ASBRAZED is BAg-2a heat treated to ASBRAZED — use for joint strength verification of the solidified filler at 380 MPa tensile and 200 °C maximum service; with overlap of at least 3t the joint is normally governed by the base metal. BAg-2a ASBRAZED has a yield strength of 210 MPa (30.5 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 61% of precious metal grades. Elongation at break is 28% and the elastic modulus is 90 GPa (13.1 Msi). BAg-2a ASBRAZED has a density of 9.4 g/cm³ (0.34 lb/in³), lighter than 82% of precious metal grades. It melts at 607°C (1,125 °F).
Advantages
- Low embodied carbon — 45 kg CO₂/kg, better than 93% of precious metal grades
Limitations
- Limited service temperature — 200°C (392 °F), worse than 89% of precious metal grades
- Difficult to weld — 20/100, worse than 86% of precious metal grades
- Needs corrosion protection — 62/100, worse than 83% of precious metal grades
- Hard to polish — 70/100, worse than 76% of precious metal grades
BAg-2a ASBRAZED properties
Typical room-temperature values for BAg-2a ASBRAZED; 3 are specific to this condition. Other listed values are BAg-2a reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
BAg-2a ASBRAZED has a density of 9.4 g/cm³ (0.34 lb/in³), lighter than 82% of precious metal grades. It melts at 607°C (1,125 °F).
Mechanical10
BAg-2a ASBRAZED has a yield strength of 210 MPa (30.5 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 61% of precious metal grades. Elongation at break is 28% and the elastic modulus is 90 GPa (13.1 Msi).
Thermal6
BAg-2a ASBRAZED is rated for continuous service to 200°C (392 °F). It conducts heat at 75 W/m·K (43.3 BTU/hr·ft·°F), worse than 57% of precious metal grades. Thermal expansion is 19 µm/m·K (10.6 µin/in·°F).
Electrical3
BAg-2a ASBRAZED conducts electricity at 20 % IACS, better than 53% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 83% of precious metal grades.
Sustainability4
Producing a kilogram of BAg-2a ASBRAZED takes about 600 MJ of energy and emits 45 kg of CO₂ — less than 93% of precious metal grades. Typical recycled content is 45%.
Manufacturability6
BAg-2a ASBRAZED'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-2a ASBRAZED
Is BAg-2a easy to machine?
The filler itself is seldom machined; it is soft and sticky, so use sharp tools with large rake angles and ample lubrication. Squeezed-out filler at the joint is best removed by grinding.
Can BAg-2a be welded?
Not used as a fusion welding consumable. Braze by torch, induction or furnace (a reducing atmosphere or vacuum is not recommended because cadmium and zinc volatilise and contaminate the chamber), with 0.05–0.13 mm joint clearance and an FB3-A / AWS Type 3A silver brazing flux.
Can BAg-2a be formed, bent or molded?
Ductility is high: it can be drawn to 0.3 mm wire, rolled to 0.1 mm foil and stamped into preforms. Intermediate annealing at about 550–600 °C with rapid cooling is needed once work hardened.
What surface finishes work on BAg-2a?
Rinse with hot or warm water after brazing and pickle to remove borax-type flux residue. Cadmium-bearing joints must not be used in food or drinking-water systems; they can be covered by nickel or chrome plating, and local exhaust ventilation is mandatory to prevent cadmium fume poisoning.
BAg-2a 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-2a | 29 – 31 | 30 |
| Cu | 26 – 28 | 27 |
| Cdtoxic; forced fume extraction required when brazing | 19 – 21 | 20 |
| Other (total)maximum total impurities | ≤ 0.15 | |
| Znbalance (Zn balances the composition per standard) | ≥ 21 (balance) |
BAg-2a ASBRAZED — frequently asked
What is BAg-2a ASBRAZED used for?
BAg-2a ASBRAZED is typically used for general steel/brass brazing, appliance manufacturing and hardware assembly. In short: lowest-cost cadmium BAg; 30 % silver economy grade; cadmium-bearing, not RoHS.
What is the yield strength of BAg-2a ASBRAZED?
BAg-2a ASBRAZED has a typical yield strength of 210 MPa (30.5 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 61% of precious metal grades.
Is BAg-2a ASBRAZED easy to machine?
Reasonably — machinability is rated fair (45/100, better than 59% of precious metal grades). The filler itself is seldom machined; it is soft and sticky, so use sharp tools with large rake angles and ample lubrication. Squeezed-out filler at the joint is best removed by grinding.
Can BAg-2a ASBRAZED be welded?
Not readily — weldability is rated poor (20/100). Not used as a fusion welding consumable. Braze by torch, induction or furnace (a reducing atmosphere or vacuum is not recommended because cadmium and zinc volatilise and contaminate the chamber), with 0.05–0.13 mm joint clearance and an FB3-A / AWS Type 3A silver brazing flux.
What surface finishes work on BAg-2a ASBRAZED?
Rinse with hot or warm water after brazing and pickle to remove borax-type flux residue. Cadmium-bearing joints must not be used in food or drinking-water systems; they can be covered by nickel or chrome plating, and local exhaust ventilation is mandatory to prevent cadmium fume poisoning.
Can BAg-2a ASBRAZED be formed, bent or molded?
Ductility is high: it can be drawn to 0.3 mm wire, rolled to 0.1 mm foil and stamped into preforms. Intermediate annealing at about 550–600 °C with rapid cooling is needed once work hardened.
What is the maximum service temperature of BAg-2a ASBRAZED?
BAg-2a ASBRAZED 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 — AWS (2019)
- ASME BPVC Section II Part C, SFA-5.8 — ASME (2023)
- GB/T 10046 (2018)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering — ASM International (1993)
- Silver brazing filler metal technical data (BAg series) — Lucas-Milhaupt / Handy & Harman (2022)
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.