Precious Metal BAg-2a
UNS P07300
BAg-2a is a 30 % silver cadmium-bearing Ag–Cu–Zn–Cd brazing filler (UNS P07300), the economy member of the cadmium BAg group with flow behaviour close to BAg-2.
Reference datasheet — BAg-2a 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.
BAg-2a tempers and conditions
BAg-2a is supplied in one standard condition, ASBRAZED.
Supply forms, finishes and certifications
Ways BAg-2a is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
PREFORM | Stamped ring, washer or shim | Supply form |
STRIP | Strip / Foil | Supply form |
WIREDefault | Wire / Rod | Supply form |
PASTE | Atomized powder + flux + binder | Printing process |
FLUXCOAT | Flux-coated rod | Surface finish |
What is BAg-2a?
BAg-2a is a 30 % silver cadmium-bearing Ag–Cu–Zn–Cd brazing filler (UNS P07300), the economy member of the cadmium BAg group with flow behaviour close to BAg-2. It is used for cost-sensitive production brazing of steel and brass, and is supplied as wire, flux-coated rod, strip, preforms and paste. As-brazed joints give 400 MPa tensile with 28 % elongation. The lower silver content narrows the process window relative to BAg-2, service is limited by the cadmium-bearing matrix, and the alloy cannot be used on food or potable-water systems — step up to BAg-2 for easier flow or BAg-24 for a cadmium-free joint. BAg-2a 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). BAg-2a has a yield strength of 210 MPa (30.5 ksi) and a tensile strength of 400 MPa (58 ksi) — stronger than 61% of precious metal grades. Elongation at break is 28% and the elastic modulus is 90 GPa (13.1 Msi).
What is BAg-2a used for?
- general steel/brass brazing
- appliance manufacturing
- hardware assembly
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 properties
Typical room-temperature values; bars are the position among precious metal grades.
Physical3
BAg-2a 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 has a yield strength of 210 MPa (30.5 ksi) and a tensile strength of 400 MPa (58 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 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 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 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's machinability is fair (45/100, better than 59% of precious metal grades); weldability poor (20/100); 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-2a is highlighted; hover a dot for its name, or open the interactive family chart.
Working with BAg-2a
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.
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) |
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.
Equivalent designations
Standards and trade names that resolve to Precious Metal BAg-2a in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- P07300
- Also called
- AWS BAg-2a
How much does BAg-2a cost?
BAg-2a 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-2a — frequently asked
What is BAg-2a used for?
BAg-2a 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?
BAg-2a has a typical yield strength of 210 MPa (30.5 ksi) and a tensile strength of 400 MPa (58 ksi) — stronger than 61% of precious metal grades.
Is BAg-2a 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 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?
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 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?
BAg-2a 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.
How much does BAg-2a cost?
BAg-2a 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)
- 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; 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.