Precious Metal BAg-34
UNS P07380
BAg-34 is a general-purpose cadmium-free silver brazing filler metal (UNS P07380) intended as a broad substitute for cadmium-bearing 35–40 % silver fillers in standard brazing work.
Reference datasheet — BAg-34 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-34 tempers and conditions
BAg-34 is supplied in one standard condition, ASBRAZED.
Supply forms, finishes and certifications
Ways BAg-34 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
FCR | Flux-coated rod | Supply form |
PREFORM | Preform / ring / washer | Supply form |
STRIP | Strip / foil | Supply form |
WIREDefault | Bare wire / rod | Supply form |
PASTE | Powder-in-flux paste | Printing process |
What is BAg-34?
BAg-34 is a general-purpose cadmium-free silver brazing filler metal (UNS P07380) intended as a broad substitute for cadmium-bearing 35–40 % silver fillers in standard brazing work. It is chosen for routine torch, induction, resistance and furnace brazing and is available as wire, flux-coated rod, strip, preforms and paste. As-brazed strength is about 430 MPa with 25 % elongation, and the alloy is very ductile, so preforms stamp and draw without cracking. Brazing temperature is 730–845 °C, higher than tin-modified BAg-7, which is the usual choice when a lower melting range is required. BAg-34 has a density of 9 g/cm³ (0.325 lb/in³), lighter than 92% of precious metal grades. It melts at 649°C (1,200 °F). BAg-34 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 430 MPa (62.4 ksi) — stronger than 81% of precious metal grades. Elongation at break is 25% and the elastic modulus is 85 GPa (12.3 Msi).
What is BAg-34 used for?
- general fabrication brazing
- HVAC/refrigeration joints
- cadmium-restricted production
Advantages
- Lightweight — 9 g/cm³ (0.325 lb/in³), better than 92% of precious metal grades
- Low embodied carbon — 50 kg CO₂/kg, better than 90% of precious metal grades
- High strength — 250 MPa (36.3 ksi), better than 81% of precious metal grades
Limitations
- Needs corrosion protection — 55/100, worse than 94% of precious metal grades
- Hard to polish — 60/100, worse than 92% of precious metal grades
- 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
BAg-34 properties
Typical room-temperature values; bars are the position among precious metal grades.
Physical3
BAg-34 has a density of 9 g/cm³ (0.325 lb/in³), lighter than 92% of precious metal grades. It melts at 649°C (1,200 °F).
Mechanical9
BAg-34 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 430 MPa (62.4 ksi) — stronger than 81% of precious metal grades. Elongation at break is 25% and the elastic modulus is 85 GPa (12.3 Msi).
Thermal6
BAg-34 is rated for continuous service to 200°C (392 °F). It conducts heat at 85 W/m·K (49.1 BTU/hr·ft·°F), worse than 53% of precious metal grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
BAg-34 conducts electricity at 20 % IACS, better than 53% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 94% of precious metal grades.
Sustainability4
Producing a kilogram of BAg-34 takes about 620 MJ of energy and emits 50 kg of CO₂ — less than 91% of precious metal grades. Typical recycled content is 45%.
Manufacturability6
BAg-34's machinability is fair (40/100, worse than 60% 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-34 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with BAg-34
Is BAg-34 easy to machine?
Rarely machined; the soft gummy alloy smears — use sharp, high-rake tooling and light cuts if trimming preforms.
Can BAg-34 be welded?
Not a weldable structural alloy; it is itself a filler — join by torch, induction, resistance or furnace brazing at 730–845 °C.
Can BAg-34 be formed, bent or molded?
Very ductile — readily drawn to fine wire, rolled to foil and stamped into rings and washers without interstage cracking.
BAg-34 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-34 / UNS P07380 | 37 – 39 | 38 |
| Cu | 30 – 32 | 31 |
| Snlowers liquidus, improves wetting | 1.5 – 2.5 | 2 |
| Cdcadmium-free grade | ≤ 0.01 | 0 |
| Other (total)total of all other elements | ≤ 0.15 | |
| Zn | balance |
What surface finishes work on BAg-34?
Remove all corrosive flux residue with hot water/citric-acid rinse after brazing; fillets can be lightly polished or plated after full flux removal.
Equivalent designations
Standards and trade names that resolve to Precious Metal BAg-34 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- P07380
- Also called
- AWS BAg-34
How much does BAg-34 cost?
BAg-34 is a high-cost precious metal ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
BAg-34 — frequently asked
What is BAg-34 used for?
BAg-34 is typically used for general fabrication brazing, HVAC/refrigeration joints and cadmium-restricted production. In short: cadmium-free 35–40 % Ag substitute; very ductile, easy to preform; broad general-purpose filler.
What is the yield strength of BAg-34?
BAg-34 has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 430 MPa (62.4 ksi) — stronger than 81% of precious metal grades.
Is BAg-34 easy to machine?
Not especially — machinability is rated fair (40/100, worse than 60% of precious metal grades). Rarely machined; the soft gummy alloy smears — use sharp, high-rake tooling and light cuts if trimming preforms.
Can BAg-34 be welded?
Not readily — weldability is rated poor (20/100). Not a weldable structural alloy; it is itself a filler — join by torch, induction, resistance or furnace brazing at 730–845 °C.
What surface finishes work on BAg-34?
Remove all corrosive flux residue with hot water/citric-acid rinse after brazing; fillets can be lightly polished or plated after full flux removal.
Can BAg-34 be formed, bent or molded?
Very ductile — readily drawn to fine wire, rolled to foil and stamped into rings and washers without interstage cracking.
What is the maximum service temperature of BAg-34?
BAg-34 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does BAg-34 cost?
BAg-34 is a high-cost precious metal ($$$$), 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 — American Welding Society (2019)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering (Brazing Filler Metals) — ASM International (1993)
- GB/T 10046 (2018)
- Cadmium-free silver brazing alloy datasheets (38% Ag Cu-Zn-Sn) — Lucas-Milhaupt / Harris / (2023)
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.