Precious Metal BAg-27 AS-BRAZED
Heat-treated state
UNS P07251
Design-reference joint properties rather than filler-bar properties.
Values for the AS-BRAZED condition
What is BAg-27 AS-BRAZED?
BAg-27 AS-BRAZED is BAg-27 heat treated to AS-BRAZED — design-reference joint properties rather than filler-bar properties. BAg-27 AS-BRAZED has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 340 MPa (49.3 ksi) — stronger than 81% of precious metal grades. Elongation at break is 25% and the elastic modulus is 85 GPa (12.3 Msi). BAg-27 AS-BRAZED has a density of 9 g/cm³ (0.325 lb/in³), lighter than 92% of precious metal grades. It melts at 605°C (1,121 °F).
Advantages
- Low embodied carbon — 40 kg CO₂/kg, better than 96% of precious metal grades
- Lightweight — 9 g/cm³ (0.325 lb/in³), better than 92% 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-27 AS-BRAZED properties
Typical room-temperature values for BAg-27 AS-BRAZED; 3 are specific to this condition. Other listed values are BAg-27 reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
BAg-27 AS-BRAZED has a density of 9 g/cm³ (0.325 lb/in³), lighter than 92% of precious metal grades. It melts at 605°C (1,121 °F).
Mechanical11
BAg-27 AS-BRAZED has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 340 MPa (49.3 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-27 AS-BRAZED 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 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
BAg-27 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-27 AS-BRAZED takes about 440 MJ of energy and emits 40 kg of CO₂ — less than 97% of precious metal grades. Typical recycled content is 40%.
Manufacturability6
BAg-27 AS-BRAZED'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-27 AS-BRAZED
Is BAg-27 easy to machine?
Rarely machined; the alloy is soft and gummy — use sharp, high-rake tools and collect all swarf as cadmium-bearing scrap for refining.
Can BAg-27 be welded?
Not a weldable structural alloy; it is itself the joining consumable and should not be arc-welded (cadmium vaporizes).
Can BAg-27 be formed, bent or molded?
Readily hot-cast then cold rolled and drawn to strip, wire and preforms with intermediate anneals around 550–600 °C.
What surface finishes work on BAg-27?
Braze joints clean up with hot water/mechanical flux removal; the fillet takes a bright polish but slowly tarnishes in sulfur atmospheres, so plate or lacquer for decorative work.
BAg-27 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 P07251 | 24 – 26 | 25 |
| Cu | 34 – 36 | 35 |
| Cdtoxic — fume extraction mandatory; restricted by RoHS/REACH and potable-water codes | 12.5 – 14.5 | 13.5 |
| Other (total)residual elements, total | ≤ 0.15 | |
| Zn | ≥ 24.5 (balance) |
BAg-27 AS-BRAZED — frequently asked
What is BAg-27 AS-BRAZED used for?
BAg-27 AS-BRAZED is typically used for general steel and brass brazing, production line assembly brazing, copper alloy tube and fitting joints, hardware and appliance subassemblies, stamped preform rings for automated brazing and flux-coated rod torch brazing. In short: tin-bearing BAg-26 alternative; low-silver production filler; cadmium-bearing handling required.
What is the yield strength of BAg-27 AS-BRAZED?
BAg-27 AS-BRAZED has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 340 MPa (49.3 ksi) — stronger than 81% of precious metal grades.
Is BAg-27 AS-BRAZED 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 — use sharp, high-rake tools and collect all swarf as cadmium-bearing scrap for refining.
Can BAg-27 AS-BRAZED be welded?
Not readily — weldability is rated poor (20/100). Not a weldable structural alloy; it is itself the joining consumable and should not be arc-welded (cadmium vaporizes).
What surface finishes work on BAg-27 AS-BRAZED?
Braze joints clean up with hot water/mechanical flux removal; the fillet takes a bright polish but slowly tarnishes in sulfur atmospheres, so plate or lacquer for decorative work.
Can BAg-27 AS-BRAZED be formed, bent or molded?
Readily hot-cast then cold rolled and drawn to strip, wire and preforms with intermediate anneals around 550–600 °C.
What is the maximum service temperature of BAg-27 AS-BRAZED?
BAg-27 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 A5.8M/A5.8 Specification for Filler Metals for Brazing and Braze Welding — American Welding Society (2019)
- ASME BPVC Section II Part C, SFA-5.8 — ASME (2023)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering — ASM International (1993)
- Brazing Handbook, 5th ed. — American Welding Society (2007)
- Silver brazing alloy datasheets (25 % Ag Cd-bearing grades) — Lucas-Milhaupt / Handy & Harman (2022)
- GB/T 10046 (2018)
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.