Precious Metal BVAg-0
UNS P07017
BVAg-0 (UNS P07017) is a zinc-free, low-vapor-pressure silver brazing filler engineered for vacuum furnace brazing, where volatile elements would contaminate the chamber or the workpiece.
Reference datasheet — BVAg-0 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-0 tempers and conditions
BVAg-0 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 BVAg-0 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
ANN-WIRE | Annealed wire / rod | Supply form |
FOIL | Rolled foil / ribbon and stamped preforms | Supply form |
H-WIRE | Hard-drawn wire | Supply form |
POWDER-PASTE | Atomised powder / binder paste | Supply form |
What is BVAg-0?
BVAg-0 (UNS P07017) is a zinc-free, low-vapor-pressure silver brazing filler engineered for vacuum furnace brazing, where volatile elements would contaminate the chamber or the workpiece. It is soft and ductile - 150 MPa tensile, 55 MPa yield, 45% elongation, 26 HB - with 428 W/m·K thermal conductivity and 105% IACS electrical conductivity, and is supplied as annealed or hard wire, foil, powder and paste. Braze at 1010-1090 °C in vacuum or dry hydrogen with no flux; joints are rated to 400 °C service. Where a lower brazing temperature is acceptable, BAg-8a is the alternative. BVAg-0 has a density of 10.49 g/cm³ (0.379 lb/in³), heavier than 55% of precious metal grades. It melts at 962°C (1,763 °F). BVAg-0 has a yield strength of 55 MPa (7.98 ksi) and a tensile strength of 150 MPa (21.8 ksi) — weaker than 95% of precious metal grades. Elongation at break is 45% and the elastic modulus is 76 GPa (11 Msi).
What is BVAg-0 used for?
- vacuum furnace brazing
- aerospace and electron-tube assemblies
- high-vacuum instrumentation
Advantages
- Conducts heat well — 428 W/m·K (247.3 BTU/hr·ft·°F), better than 98% of precious metal grades
- High electrical conductivity — 105 % IACS, better than 98% of precious metal grades
- Ductile — tolerates forming and impact — 45%, better than 97% of precious metal grades
- Forms and bends easily — 95/100, better than 91% of precious metal grades
Limitations
- Low stiffness — 76 GPa (11 Msi), worse than 96% of precious metal grades
- Low strength — 55 MPa (7.98 ksi), worse than 95% of precious metal grades
BVAg-0 properties
Typical room-temperature values for BVAg-0-AS-BRAZED; bars are the position among precious metal grades.
Physical3
BVAg-0 has a density of 10.49 g/cm³ (0.379 lb/in³), heavier than 55% of precious metal grades. It melts at 962°C (1,763 °F).
Mechanical10
BVAg-0 has a yield strength of 55 MPa (7.98 ksi) and a tensile strength of 150 MPa (21.8 ksi) — weaker than 95% of precious metal grades. Elongation at break is 45% and the elastic modulus is 76 GPa (11 Msi).
Thermal6
BVAg-0 is rated for continuous service to 400°C (752 °F). It conducts heat at 428 W/m·K (247.3 BTU/hr·ft·°F), better than 98% of precious metal grades. Thermal expansion is 19.7 µm/m·K (10.9 µin/in·°F).
Electrical3
BVAg-0 conducts electricity at 105 % IACS, better than 98% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 61% of precious metal grades.
Sustainability4
Producing a kilogram of BVAg-0 takes about 1,500 MJ of energy and emits 110 kg of CO₂ — more than 51% of precious metal grades. Typical recycled content is 30%.
Manufacturability7
BVAg-0's machinability is fair (45/100, better than 59% of precious metal grades); weldability good (60/100); formability excellent (95/100).
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-0 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with BVAg-0
Is BVAg-0 easy to machine?
Very soft and gummy — use sharp, high-rake, polished tools, light cuts and generous lubricant to avoid smearing; slitting/stamping of foil is preferred over machining.
Can BVAg-0 be welded?
Not a structural welding alloy; braze in vacuum (<10⁻⁴ mbar) or dry hydrogen at 1010–1090 °C with clean, oxide-free, flux-free joints and 0.02–0.10 mm clearance.
Can BVAg-0 be formed, bent or molded?
Excellent cold formability — drawn to fine wire, rolled to sub-50 µm foil and stamped into rings/washer preforms; interanneal only when cold work exceeds ~60 %.
BVAg-0 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 |
|---|---|---|
| Cu | ≤ 0.01 | 0.01 |
| Phigh-vapor-pressure / brittle-phase limit | ≤ 0 | |
| Znvacuum-grade volatile limit | ≤ 0 | |
| Cdvacuum-grade volatile limit | ≤ 0 | |
| Pb | ≤ 0 | |
| Other elements, total | ≤ 0.05 | |
| AgAWS A5.8 BVAg-0, UNS P07017 | ≥ 99.95 (balance) |
What surface finishes work on BVAg-0?
Joints are used as-brazed; degrease with solvent and avoid sulphur-bearing compounds, rubber bands or fingerprints that cause tarnish and contaminate vacuum hardware.
Equivalent designations
Standards and trade names that resolve to Precious Metal BVAg-0 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- P07017
How much does BVAg-0 cost?
BVAg-0 is a high-cost precious metal ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
BVAg-0 — frequently asked
What is BVAg-0 used for?
BVAg-0 is typically used for vacuum furnace brazing, aerospace and electron-tube assemblies and high-vacuum instrumentation. In short: zinc-free vacuum-grade filler; 105% IACS conductivity; no flux required.
What is the yield strength of BVAg-0?
BVAg-0 has a typical yield strength of 55 MPa (7.98 ksi) and a tensile strength of 150 MPa (21.8 ksi) — weaker than 95% of precious metal grades.
Is BVAg-0 easy to machine?
Reasonably — machinability is rated fair (45/100, better than 59% of precious metal grades). Very soft and gummy — use sharp, high-rake, polished tools, light cuts and generous lubricant to avoid smearing; slitting/stamping of foil is preferred over machining.
Can BVAg-0 be welded?
Yes — weldability is rated good (60/100). Not a structural welding alloy; braze in vacuum (<10⁻⁴ mbar) or dry hydrogen at 1010–1090 °C with clean, oxide-free, flux-free joints and 0.02–0.10 mm clearance.
What surface finishes work on BVAg-0?
Joints are used as-brazed; degrease with solvent and avoid sulphur-bearing compounds, rubber bands or fingerprints that cause tarnish and contaminate vacuum hardware.
Can BVAg-0 be formed, bent or molded?
Excellent cold formability — drawn to fine wire, rolled to sub-50 µm foil and stamped into rings/washer preforms; interanneal only when cold work exceeds ~60 %.
What is the maximum service temperature of BVAg-0?
BVAg-0 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does BVAg-0 cost?
BVAg-0 is a high-cost precious metal ($$$$), 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)
- Brazing Handbook, 5th ed. — American Welding Society (2007)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (silver and silver alloys) — ASM International (1990)
- GB/T 10046 (2018)
- Vacuum-grade silver brazing filler metal data sheets — Lucas-Milhaupt / Materion / (2023)
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.