Precious Metal BAg-37 AS-BRAZED
Heat-treated state
UNS P07253
Use this state when rating joint load capacity: strength is governed by the base metal, a 0.05–0.15 mm gap and fill ratio, with service temperature limited to 200 °C.
Values for the AS-BRAZED condition
What is BAg-37 AS-BRAZED?
BAg-37 AS-BRAZED is BAg-37 heat treated to AS-BRAZED — use this state when rating joint load capacity: strength is governed by the base metal, a 0.05–0.15 mm gap and fill ratio, with service temperature limited to 200 °C. BAg-37 AS-BRAZED has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 400 MPa (58 ksi) — stronger than 67% of precious metal grades. Elongation at break is 25% and the elastic modulus is 90 GPa (13.1 Msi). BAg-37 AS-BRAZED has a density of 8.7 g/cm³ (0.314 lb/in³), lighter than 96% of precious metal grades. It melts at 700°C (1,292 °F).
Advantages
- Low embodied carbon — 30 kg CO₂/kg, better than 98% of precious metal grades
- Lightweight — 8.7 g/cm³ (0.314 lb/in³), better than 96% 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
- Limited formability — 70/100, worse than 78% of precious metal grades
BAg-37 AS-BRAZED properties
Typical room-temperature values for BAg-37 AS-BRAZED; 2 are specific to this condition. Other listed values are BAg-37 reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
BAg-37 AS-BRAZED has a density of 8.7 g/cm³ (0.314 lb/in³), lighter than 96% of precious metal grades. It melts at 700°C (1,292 °F).
Mechanical10
BAg-37 AS-BRAZED has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 400 MPa (58 ksi) — stronger than 67% of precious metal grades. Elongation at break is 25% and the elastic modulus is 90 GPa (13.1 Msi).
Thermal6
BAg-37 AS-BRAZED is rated for continuous service to 200°C (392 °F). It conducts heat at 100 W/m·K (57.8 BTU/hr·ft·°F), better than 55% of precious metal grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
BAg-37 AS-BRAZED conducts electricity at 19 % IACS, worse than 51% 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-37 AS-BRAZED takes about 440 MJ of energy and emits 30 kg of CO₂ — less than 97% of precious metal grades. Typical recycled content is 40%.
Manufacturability7
BAg-37 AS-BRAZED's machinability is fair (50/100, better than 74% of precious metal grades); weldability poor (20/100); formability very good (70/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with BAg-37 AS-BRAZED
Is BAg-37 easy to machine?
The filler itself is seldom machined. For cutting to length or shearing use sharp edges and low speeds, as the alloy is tough and smears onto tooling.
Can BAg-37 be welded?
Used as a brazing filler, not for fusion welding. Braze at 810-860 °C with an AWS FB3-A borax-fluoride flux, heating quickly and holding briefly to reduce zinc evaporation.
Can BAg-37 be formed, bent or molded?
Annealed material can be drawn to wire, rolled to strip and stamped into brazing rings. Intermediate anneal at about 600 °C when cold reduction is high.
What surface finishes work on BAg-37?
Residual flux must be removed completely after brazing with hot water or dilute acid, otherwise the residue corrodes the joint. Joints can be nickel or tin plated; polished seams are yellow-white and will not color-match stainless steel.
BAg-37 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 / UNS P07253 | 24 – 26 | 25 |
| Cu | 39 – 41 | 40 |
| Cdcadmium-free grade; impurity maximum | ≤ 0.01 | 0 |
| Other (total)total of other elements | ≤ 0.15 | |
| Zn | balance |
BAg-37 AS-BRAZED — frequently asked
What is BAg-37 AS-BRAZED used for?
BAg-37 AS-BRAZED is typically used for cost-sensitive general brazing, steel and brass fabrication and cadmium-restricted operations. In short: economical cadmium-free BAg; general-purpose steel and brass; cadmium-restricted shops.
What is the yield strength of BAg-37 AS-BRAZED?
BAg-37 AS-BRAZED has a typical yield strength of 220 MPa (31.9 ksi) and a tensile strength of 400 MPa (58 ksi) — stronger than 67% of precious metal grades.
Is BAg-37 AS-BRAZED easy to machine?
Reasonably — machinability is rated fair (50/100, better than 74% of precious metal grades). The filler itself is seldom machined. For cutting to length or shearing use sharp edges and low speeds, as the alloy is tough and smears onto tooling.
Can BAg-37 AS-BRAZED be welded?
Not readily — weldability is rated poor (20/100). Used as a brazing filler, not for fusion welding. Braze at 810-860 °C with an AWS FB3-A borax-fluoride flux, heating quickly and holding briefly to reduce zinc evaporation.
What surface finishes work on BAg-37 AS-BRAZED?
Residual flux must be removed completely after brazing with hot water or dilute acid, otherwise the residue corrodes the joint. Joints can be nickel or tin plated; polished seams are yellow-white and will not color-match stainless steel.
Can BAg-37 AS-BRAZED be formed, bent or molded?
Annealed material can be drawn to wire, rolled to strip and stamped into brazing rings. Intermediate anneal at about 600 °C when cold reduction is high.
What is the maximum service temperature of BAg-37 AS-BRAZED?
BAg-37 AS-BRAZED 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 A5.8/A5.8M — Specification for Filler Metals for Brazing and Braze Welding — AWS (2019)
- GB/T 10046 (2018)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering — ASM International (1993)
- Cadmium-free silver brazing alloy (25% Ag) technical data — Lucas-Milhaupt / / (2023)
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.