Precious Metal BAg-24
UNS P07505
BAg-24 is a tin-modified, cadmium-free silver braze filler (UNS P07505) developed as a drop-in replacement for BAg-1a, with comparable flow and melting characteristics.
Reference datasheet — BAg-24 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-24 tempers and conditions
BAg-24 is supplied in one standard condition, AS-BRAZED.
Supply forms, finishes and certifications
Ways BAg-24 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
FC-ROD | Flux-coated rod | Supply form |
PREFORM | Stamped/formed preform | Supply form |
RODDefault | Bare rod / wire, annealed | Supply form |
Rod-H | Cold-drawn (hard/spring-temper) wire | Supply form |
STRIP | Rolled strip / foil / shim, annealed | Supply form |
PASTE | Braze paste | Printing process |
POWDER | Atomised powder | Printing process |
What is BAg-24?
BAg-24 is a tin-modified, cadmium-free silver braze filler (UNS P07505) developed as a drop-in replacement for BAg-1a, with comparable flow and melting characteristics. It is chosen for cadmium-restricted refrigeration and instrument work and is supplied as rod, hard rod, strip, preforms, flux-coated rod, powder and paste. Default values are 420 MPa tensile, 250 MPa yield, 28% elongation and 55 HRB, the most ductile of the low-temperature BAg fillers on file. Braze at 707–843 °C and heat quickly, since slow cycles cause zinc loss and nickel-rich sludge; BAg-22 is the alternative where higher joint strength is needed. BAg-24 has a density of 9.3 g/cm³ (0.336 lb/in³), lighter than 85% of precious metal grades. It melts at 660°C (1,220 °F). BAg-24 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 420 MPa (60.9 ksi) — stronger than 81% of precious metal grades. Elongation at break is 28% and the elastic modulus is 85 GPa (12.3 Msi).
What is BAg-24 used for?
- refrigeration/AC tubing
- instrument brazing
- cadmium-restricted general fabrication
Advantages
- Low embodied carbon — 55 kg CO₂/kg, better than 86% of precious metal grades
- High strength — 250 MPa (36.3 ksi), better than 81% of precious metal grades
Limitations
- 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-24 properties
Typical room-temperature values; bars are the position among precious metal grades.
Physical3
BAg-24 has a density of 9.3 g/cm³ (0.336 lb/in³), lighter than 85% of precious metal grades. It melts at 660°C (1,220 °F).
Mechanical10
BAg-24 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 420 MPa (60.9 ksi) — stronger than 81% of precious metal grades. Elongation at break is 28% and the elastic modulus is 85 GPa (12.3 Msi).
Thermal6
BAg-24 is rated for continuous service to 300°C (572 °F). It conducts heat at 90 W/m·K (52 BTU/hr·ft·°F), worse than 51% of precious metal grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
BAg-24 conducts electricity at 22 % IACS, better than 61% 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-24 takes about 800 MJ of energy and emits 55 kg of CO₂ — less than 83% of precious metal grades. Typical recycled content is 40%.
Manufacturability5
BAg-24's machinability is fair (45/100, better than 59% of precious metal grades); formability very good (75/100).
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-24 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with BAg-24
Is BAg-24 easy to machine?
Rarely machined — the alloy is soft and gummy; supply as drawn wire, rolled strip or stamped preforms instead of machined shapes.
Can BAg-24 be welded?
Not a structural weld filler; braze at 707–843 °C with a boron-modified fluoride flux (AWS FB3-A/C) or in inert gas, and heat quickly to limit zinc loss and Ni-rich sludge.
Can BAg-24 be formed, bent or molded?
Very ductile in the annealed state — draws to fine wire, rolls to foil and stamps into rings/washers with interanneals; work-hardens moderately.
BAg-24 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 | 49 – 51 | 50 |
| Cu | 19 – 21 | 20 |
| Niimproves wetting on stainless and cemented carbide | 1.5 – 2.5 | 2 |
| Cdcadmium-free limit | ≤ 0 | |
| Other elements, totalAWS A5.8 residual limit | ≤ 0.15 | |
| Znbalance in AWS A5.8 | ≥ 26 (balance) |
What surface finishes work on BAg-24?
Wash off corrosive flux residue with hot water or acid pickle; the joint fillet takes light polishing and will tarnish in sulfur-bearing air, so plate or lacquer for decorative use.
Equivalent designations
Standards and trade names that resolve to Precious Metal BAg-24 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- P07505
- Also called
- AWS BAg-24
How much does BAg-24 cost?
BAg-24 is a high-cost precious metal ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
BAg-24 — frequently asked
What is BAg-24 used for?
BAg-24 is typically used for refrigeration/AC tubing, instrument brazing and cadmium-restricted general fabrication. In short: cadmium-free BAg-1a replacement; most ductile BAg filler; low brazing temperature range.
What is the yield strength of BAg-24?
BAg-24 has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 420 MPa (60.9 ksi) — stronger than 81% of precious metal grades.
Is BAg-24 easy to machine?
Reasonably — machinability is rated fair (45/100, better than 59% of precious metal grades). Rarely machined — the alloy is soft and gummy; supply as drawn wire, rolled strip or stamped preforms instead of machined shapes.
Can BAg-24 be welded?
Not a structural weld filler; braze at 707–843 °C with a boron-modified fluoride flux (AWS FB3-A/C) or in inert gas, and heat quickly to limit zinc loss and Ni-rich sludge.
What surface finishes work on BAg-24?
Wash off corrosive flux residue with hot water or acid pickle; the joint fillet takes light polishing and will tarnish in sulfur-bearing air, so plate or lacquer for decorative use.
Can BAg-24 be formed, bent or molded?
Very ductile in the annealed state — draws to fine wire, rolls to foil and stamps into rings/washers with interanneals; work-hardens moderately.
What is the maximum service temperature of BAg-24?
BAg-24 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does BAg-24 cost?
BAg-24 is a high-cost precious metal ($$$$), 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)
- GB/T 10046 (2018)
- ASM Handbook Vol. 6 — Welding, Brazing, and Soldering — ASM International (1993)
- AWS Brazing Handbook, 5th ed. — American Welding Society (2007)
- Cadmium-free silver brazing alloy (50 % Ag, Ni-bearing) datasheet — 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.