Precious Metal BAg-18
UNS P07600
BAg-18 (UNS P07600) is a tin-modified, cadmium-free silver brazing filler in the AWS BAg family, developed as a substitute for BAg-1/1a where cadmium is prohibited.
Reference datasheet — BAg-18 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.
Values for the AS-BRAZED condition
BAg-18 tempers and conditions
BAg-18 is supplied in one standard condition, AS-BRAZED. AS-BRAZED is the default FabDigit quotes; the values on this page are for it.
Supply forms, finishes and certifications
Ways BAg-18 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
Flux-Coated Rod | Pre-fluxed torch brazing rod | Supply form |
PREFORM | Stamped rings, washers and shaped shims | Supply form |
ROD | Bare rod | Supply form |
STRIP | Strip / foil | Supply form |
WIRE | Drawn, spooled or straight lengths | Supply form |
PASTE | Powder + binder (± flux) in syringe or cartridge | Printing process |
POWDER | Atomised, typ. -100/+325 mesh | Printing process |
What is BAg-18?
BAg-18 (UNS P07600) is a tin-modified, cadmium-free silver brazing filler in the AWS BAg family, developed as a substitute for BAg-1/1a where cadmium is prohibited. It flows well and stays ductile, and is stocked as wire, rod, flux-coated rod, strip, preforms, powder and paste for refrigeration and electrical work. The as-brazed deposit is about 210 MPa yield, 380 MPa tensile and 28 % elongation, with service limited to 200 °C. Its wide melting range calls for fast, uniform heating to avoid liquation; BAg-10 is the choice when higher joint service temperature is needed. BAg-18 has a density of 9.9 g/cm³ (0.358 lb/in³), lighter than 70% of precious metal grades. It melts at 600°C (1,112 °F). BAg-18 has a yield strength of 210 MPa (30.5 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 61% of precious metal grades. Elongation at break is 28% and the elastic modulus is 85 GPa (12.3 Msi).
What is BAg-18 used for?
- refrigeration/HVAC tubing
- electrical components
- general fabrication where Cd-free filler required
Advantages
- Low embodied carbon — 70 kg CO₂/kg, better than 76% of precious metal grades
Limitations
- 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
- 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-18 properties
Typical room-temperature values for BAg-18-AS-BRAZED; bars are the position among precious metal grades.
Physical3
BAg-18 has a density of 9.9 g/cm³ (0.358 lb/in³), lighter than 70% of precious metal grades. It melts at 600°C (1,112 °F).
Mechanical9
BAg-18 has a yield strength of 210 MPa (30.5 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 61% of precious metal grades. Elongation at break is 28% and the elastic modulus is 85 GPa (12.3 Msi).
Thermal6
BAg-18 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-18 conducts electricity at 17 % IACS, worse than 56% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 83% of precious metal grades.
Sustainability4
Producing a kilogram of BAg-18 takes about 950 MJ of energy and emits 70 kg of CO₂ — less than 77% of precious metal grades. Typical recycled content is 50%.
Manufacturability6
BAg-18's machinability is fair (35/100, worse than 73% of precious metal grades); weldability poor (20/100); formability excellent (85/100).
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-18 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with BAg-18
Is BAg-18 easy to machine?
Rarely machined; the soft, gummy deposit smears — use sharp tools, high rake and light cuts if joint dressing is required.
Can BAg-18 be welded?
Not a weldable structural alloy — it is a brazing filler; braze at 720–845 °C with fast, uniform heating to limit liquation of the wide melting range.
Can BAg-18 be formed, bent or molded?
Very ductile — readily drawn to fine wire, rolled to foil and stamped into rings/preforms without interstage cracking.
BAg-18 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-18 | 59 – 61 | 60 |
| Sn | 9.5 – 10.5 | 10 |
| Cdcadmium-free grade | ≤ 0.01 | 0 |
| Znessentially zinc-free — suitable for vacuum service | ≤ 0.1 | 0 |
| Total other elementsAWS impurity limit | ≤ 0.15 | |
| Curemainder ≈ 29–30 % | balance |
What surface finishes work on BAg-18?
Remove flux residue with hot water/mechanical scrub to avoid corrosion; the deposit polishes and electroplates well but tarnishes in sulphur-bearing air.
Equivalent designations
Standards and trade names that resolve to Precious Metal BAg-18 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- P07600
- Also called
- AWS BAg-18
How much does BAg-18 cost?
BAg-18 is a high-cost precious metal ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
BAg-18 — frequently asked
What is BAg-18 used for?
BAg-18 is typically used for refrigeration/HVAC tubing, electrical components and general fabrication where Cd-free filler required. In short: cadmium-free BAg-1 substitute; tin-modified for free flow; very ductile deposit.
What is the yield strength of BAg-18?
BAg-18 has a typical yield strength of 210 MPa (30.5 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 61% of precious metal grades.
Is BAg-18 easy to machine?
Not especially — machinability is rated fair (35/100, worse than 73% of precious metal grades). Rarely machined; the soft, gummy deposit smears — use sharp tools, high rake and light cuts if joint dressing is required.
Can BAg-18 be welded?
Not readily — weldability is rated poor (20/100). Not a weldable structural alloy — it is a brazing filler; braze at 720–845 °C with fast, uniform heating to limit liquation of the wide melting range.
What surface finishes work on BAg-18?
Remove flux residue with hot water/mechanical scrub to avoid corrosion; the deposit polishes and electroplates well but tarnishes in sulphur-bearing air.
Can BAg-18 be formed, bent or molded?
Very ductile — readily drawn to fine wire, rolled to foil and stamped into rings/preforms without interstage cracking.
What is the maximum service temperature of BAg-18?
BAg-18 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does BAg-18 cost?
BAg-18 is a high-cost precious metal ($$$$), 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 A5.8/A5.8M — Specification for Filler Metals for Brazing and Braze Welding — American Welding Society (2019)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering — ASM International (1993)
- Silver brazing alloy datasheets (BAg-series, cadmium-free) — 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.