Precious Metal BAg-27
UNS P07251
BAg-27 is a tin-bearing, low-silver braze filler (UNS P07251) that offers an alternative flow and melting profile to BAg-26 for general brazing of steel and brass.
Reference datasheet — BAg-27 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-27 tempers and conditions
BAg-27 is supplied in one standard condition, AS-BRAZED.
Supply forms, finishes and certifications
Ways BAg-27 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 / straight length | Supply form |
STRIP | Rolled strip / ribbon | Supply form |
WIRE | Drawn wire / coil | Supply form |
PASTE | Flux-bonded braze paste | Printing process |
POWDER | Atomized powder | Printing process |
What is BAg-27?
BAg-27 is a tin-bearing, low-silver braze filler (UNS P07251) that offers an alternative flow and melting profile to BAg-26 for general brazing of steel and brass. It is supplied as rod, wire, strip, preforms, flux-coated rod, powder and paste, with as-brazed values of 400 MPa tensile, 25% elongation and 90 HB. The alloy is a joining consumable only and must not be arc-welded because cadmium vaporizes; swarf and offcuts are handled as cadmium-bearing scrap. Where cadmium is restricted, use BAg-26 or BAg-24 instead. BAg-27 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). BAg-27 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 400 MPa (58 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-27 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
- Flux-coated rod torch brazing
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 properties
Typical room-temperature values; bars are the position among precious metal grades.
Physical3
BAg-27 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 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 400 MPa (58 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 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 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 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'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-27 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with BAg-27
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.
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) |
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.
Equivalent designations
Standards and trade names that resolve to Precious Metal BAg-27 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- P07251
- Also called
- AWS BAg-27
How much does BAg-27 cost?
BAg-27 is a high-cost precious metal ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
BAg-27 — frequently asked
What is BAg-27 used for?
BAg-27 is typically used for general steel and brass brazing, production line assembly brazing, copper alloy tube and fitting joints, hardware and appliance subassemblies, stamped preform rings for automated brazing and flux-coated rod torch brazing. In short: tin-bearing BAg-26 alternative; low-silver production filler; cadmium-bearing handling required.
What is the yield strength of BAg-27?
BAg-27 has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 400 MPa (58 ksi) — stronger than 81% of precious metal grades.
Is BAg-27 easy to machine?
Reasonably — machinability is rated fair (45/100, better than 59% of precious metal grades). Rarely machined; the alloy is soft and gummy — use sharp, high-rake tools and collect all swarf as cadmium-bearing scrap for refining.
Can BAg-27 be welded?
Not readily — weldability is rated poor (20/100). Not a weldable structural alloy; it is itself the joining consumable and should not be arc-welded (cadmium vaporizes).
What surface finishes work on BAg-27?
Braze joints clean up with hot water/mechanical flux removal; the fillet takes a bright polish but slowly tarnishes in sulfur atmospheres, so plate or lacquer for decorative work.
Can BAg-27 be formed, bent or molded?
Readily hot-cast then cold rolled and drawn to strip, wire and preforms with intermediate anneals around 550–600 °C.
What is the maximum service temperature of BAg-27?
BAg-27 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does BAg-27 cost?
BAg-27 is a high-cost precious metal ($$$$), 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)
- 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; 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.