Precious Metal BVAg-29
UNS P07627
BVAg-29 is a low-vapor-pressure silver-copper based braze filler (UNS P07627) in the vacuum-service BVAg family, formulated without zinc or cadmium for furnace and vacuum brazing of stainless and nickel-base assemblies.
Reference datasheet — BVAg-29 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
BVAg-29 tempers and conditions
BVAg-29 is supplied in 3 conditions, soft to hard. AS-BRAZED is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Standard supply condition for rolled foil, washers and stamped preforms that must conform to the joint gap without spring-back. | 120 | 230 | 30 | 66 HB | 21 % IACS |
AS-BRAZEDDefault solidified joint filler (vacuum/furnace cycle) | Pick for design data of the finished joint: cast dendritic Ag-Cu-In structure after a 715–845 °C vacuum braze cycle. | 150 | 255 | 22 | 85 HB | 20 % IACS |
Cold Drawn / Hard | Choose for wire and pre-formed rings that must hold shape and stay seated in the joint during handling and furnace loading. | 350 | 420 | 5 | 123 HB | 19 % IACS |
Supply forms, finishes and certifications
Ways BVAg-29 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
POWDER-PASTE | Powder / Paste | Supply form |
What is BVAg-29?
BVAg-29 is a low-vapor-pressure silver-copper based braze filler (UNS P07627) in the vacuum-service BVAg family, formulated without zinc or cadmium for furnace and vacuum brazing of stainless and nickel-base assemblies. It is chosen where outgassing must stay low and no flux residue is acceptable, and is supplied in annealed and cold-worked wire plus powder and paste forms. As-brazed deposits give about 255 MPa tensile, 150 MPa yield and 22% elongation, with a service limit near 300 °C and a machinability rating of 45. For higher-temperature service or a higher-silver joint, BVAg-30 or BVAg-18 are the closer options. BVAg-29 has a density of 9.7 g/cm³ (0.35 lb/in³), lighter than 78% of precious metal grades. It melts at 605°C (1,121 °F). BVAg-29 has a yield strength of 150 MPa (21.8 ksi) and a tensile strength of 255 MPa (37 ksi) — weaker than 68% of precious metal grades. Elongation at break is 22% and the elastic modulus is 83 GPa (12 Msi).
What is BVAg-29 used for?
- Vacuum furnace brazing of stainless steel assemblies
- Nickel-alloy subassemblies
- Sealed instrument and sensor housings
- Vacuum system fittings and flanges
- Paste-applied joints on thin-wall tubing
- Foil and ring preforms for sleeve joints
Limitations
- Difficult to weld — 20/100, worse than 86% of precious metal grades
- Limited formability — 70/100, worse than 78% of precious metal grades
- Hard to polish — 70/100, worse than 76% of precious metal grades
BVAg-29 properties
Typical room-temperature values for BVAg-29-AS-BRAZED; bars are the position among precious metal grades.
Physical3
BVAg-29 has a density of 9.7 g/cm³ (0.35 lb/in³), lighter than 78% of precious metal grades. It melts at 605°C (1,121 °F).
Mechanical13
BVAg-29 has a yield strength of 150 MPa (21.8 ksi) and a tensile strength of 255 MPa (37 ksi) — weaker than 68% of precious metal grades. Elongation at break is 22% and the elastic modulus is 83 GPa (12 Msi).
Thermal5
BVAg-29 is rated for continuous service to 300°C (572 °F). It conducts heat at 70 W/m·K (40.4 BTU/hr·ft·°F), worse than 63% of precious metal grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
BVAg-29 conducts electricity at 20 % IACS, better than 53% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), worse than 70% of precious metal grades.
Sustainability4
Producing a kilogram of BVAg-29 takes about 1,100 MJ of energy and emits 78 kg of CO₂ — less than 71% of precious metal grades. Typical recycled content is 40%.
Manufacturability7
BVAg-29's machinability is fair (45/100, better than 59% of precious metal grades); weldability poor (20/100); formability very good (70/100).
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. BVAg-29 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with BVAg-29
Is BVAg-29 easy to machine?
Rarely machined; the alloy is soft and gummy — use sharp high-rake tools, light cuts and collect all chips for silver reclaim.
Can BVAg-29 be welded?
Not a weld consumable: apply as foil, wire, powder or paste with 0.025–0.075 mm joint clearance and braze at 715–845 °C under vacuum (10⁻⁴–10⁻⁵ mbar) or dry hydrogen, no flux needed.
Can BVAg-29 be formed, bent or molded?
Readily rolled to 25–100 µm foil and drawn to fine wire in the annealed state; interanneal to avoid cracking when stamping preforms.
BVAg-29 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 |
|---|---|---|
| Agsilver content per AWS A5.8 BVAg-29 | 60.5 – 62.5 | 61.5 |
| Inmelting-point depressant, replaces Zn/Cd | 13.5 – 15.5 | 14.5 |
| Cdvacuum-grade high-vapor-pressure element limit | ≤ 0 | |
| Znvacuum-grade limit | ≤ 0 | |
| Pimpurity limit | ≤ 0 | |
| Other (total)total other elements | ≤ 0.15 | |
| Cu | balance |
What surface finishes work on BVAg-29?
Joints need only degreasing; silver fillets tarnish in sulphurous air and can be protected by nickel/gold plating or passivation of the surrounding base metal.
Equivalent designations
Standards and trade names that resolve to Precious Metal BVAg-29 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- P07627
How much does BVAg-29 cost?
BVAg-29 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.
BVAg-29 — frequently asked
What is BVAg-29 used for?
BVAg-29 is typically used for vacuum furnace brazing of stainless steel assemblies, nickel-alloy subassemblies, sealed instrument and sensor housings, vacuum system fittings and flanges, paste-applied joints on thin-wall tubing and foil and ring preforms for sleeve joints. In short: zinc- and cadmium-free; vacuum-purity BAg filler; clean flux-free joints.
What is the yield strength of BVAg-29?
BVAg-29 has a typical yield strength of 150 MPa (21.8 ksi) and a tensile strength of 255 MPa (37 ksi) — weaker than 68% of precious metal grades. Strength varies by condition: see the 3 listed tempers.
Is BVAg-29 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, light cuts and collect all chips for silver reclaim.
Can BVAg-29 be welded?
Not readily — weldability is rated poor (20/100). Not a weld consumable: apply as foil, wire, powder or paste with 0.025–0.075 mm joint clearance and braze at 715–845 °C under vacuum (10⁻⁴–10⁻⁵ mbar) or dry hydrogen, no flux needed.
What surface finishes work on BVAg-29?
Joints need only degreasing; silver fillets tarnish in sulphurous air and can be protected by nickel/gold plating or passivation of the surrounding base metal.
Can BVAg-29 be formed, bent or molded?
Readily rolled to 25–100 µm foil and drawn to fine wire in the annealed state; interanneal to avoid cracking when stamping preforms.
What is the maximum service temperature of BVAg-29?
BVAg-29 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.
What is the difference between BVAg-29 AS-BRAZED and BVAg-29 CW-Hard?
AS-BRAZED is the default condition — pick for design data of the finished joint: cast dendritic Ag-Cu-In structure after a 715–845 °C vacuum braze cycle. CW-Hard: choose for wire and pre-formed rings that must hold shape and stay seated in the joint during handling and furnace loading. Yield strength is 150 MPa in AS-BRAZED versus 350 MPa in CW-Hard.
How much does BVAg-29 cost?
BVAg-29 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)
- SAE/AMS 3130-series & UNS P07xxx precious-metal filler designations — SAE International / ASTM-SAE UNS (2018)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering (Brazing Filler Metals) — ASM International (1993)
- AWS Brazing Handbook, 5th ed. — American Welding Society (2007)
- Vacuum-grade Ag-Cu-In brazing alloy (foil, wire, powder) data — Morgan Advanced Materials (Wesgo Metals) (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.