Precious Metal BVAg-31 Annealed
Temper · default condition
UNS P07587
Default stocked form: soft drawn wire or rod for hand feeding, automatic wire dispensing and ring forming.
Values for the Annealed condition
Other BVAg-31 tempers and conditions
BVAg-31 is listed in 2 conditions; see the grade overview at BVAg-31.
- AS-BRAZED
- Annealed
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
solidified filler in the joint | Design condition for joint strength calculations after a vacuum braze cycle at 870–925 °C. | 230 | 400 | 18 | 115 HB | 10.5 % IACS |
AnnealedDefaultThis page vacuum-melted wire / rod, soft temper | Default stocked form: soft drawn wire or rod for hand feeding, automatic wire dispensing and ring forming. | 240 | 420 | 22 | 110 HB | 11 % IACS |
What is BVAg-31 Annealed?
BVAg-31 Annealed is BVAg-31 in the Annealed temper — default stocked form: soft drawn wire or rod for hand feeding, automatic wire dispensing and ring forming. BVAg-31 Annealed has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 420 MPa (60.9 ksi) — stronger than 73% of precious metal grades. Elongation at break is 22% and the elastic modulus is 100 GPa (14.5 Msi). BVAg-31 Annealed has a density of 10.1 g/cm³ (0.365 lb/in³), lighter than 61% of precious metal grades. It melts at 824°C (1,515 °F).
Limitations
- Low electrical conductivity — 11 % IACS, worse than 75% of precious metal grades
BVAg-31 Annealed properties
Typical room-temperature values for BVAg-31 Annealed; 19 are specific to this condition. Other listed values are BVAg-31 reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
BVAg-31 Annealed has a density of 10.1 g/cm³ (0.365 lb/in³), lighter than 61% of precious metal grades. It melts at 824°C (1,515 °F).
Mechanical13
BVAg-31 Annealed has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 420 MPa (60.9 ksi) — stronger than 73% of precious metal grades. Elongation at break is 22% and the elastic modulus is 100 GPa (14.5 Msi).
Thermal6
BVAg-31 Annealed is rated for continuous service to 450°C (842 °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 µm/m·K (10 µin/in·°F).
Electrical3
BVAg-31 Annealed conducts electricity at 11 % IACS, worse than 75% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is very good (82/100), better than 53% of precious metal grades.
Sustainability3
Producing a kilogram of BVAg-31 Annealed takes about 4,400 MJ of energy and emits 420 kg of CO₂ — more than 58% of precious metal grades. Typical recycled content is 50%.
Manufacturability8
BVAg-31 Annealed's machinability is fair (40/100, worse than 60% of precious metal grades); weldability poor (30/100); formability very good (80/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with BVAg-31 Annealed
Is BVAg-31 easy to machine?
Rarely machined; the alloy is soft and gummy — use sharp, polished high-rake tools and collect all chips as precious-metal scrap.
Can BVAg-31 be welded?
Not a weld filler; joints are made by vacuum or dry-hydrogen furnace brazing at roughly 870–925 °C with a short soak to limit erosion of thin base metals.
Can BVAg-31 be formed, bent or molded?
Excellent cold formability in the annealed state — drawn to fine wire, rolled to 25 µm foil and stamped into rings; interstage anneal near 650–700 °C in inert atmosphere.
What surface finishes work on BVAg-31?
Fluxless brazing in vacuum leaves a bright, clean fillet needing no cleaning; if flux-brazed in air, remove residues with hot water/citric rinse before plating or passivation.
BVAg-31 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 BVAg-31 / UNS P07587 | 58 – 59 | 58.5 |
| Pdraises melting range and high-temperature joint strength | 9.5 – 10.5 | 10 |
| Znvacuum-grade high-vapor-pressure element limit | ≤ 0 | — |
| Cdvacuum-grade limit | ≤ 0 | — |
| Pvacuum-grade limit | ≤ 0 | — |
| Other (total)total of other elements | ≤ 0.15 | — |
| Cu | balance | — |
BVAg-31 Annealed — frequently asked
What is BVAg-31 Annealed used for?
BVAg-31 Annealed is typically used for vacuum furnace brazing of stainless steel assemblies, superalloy joints in turbine and engine hardware, vacuum-tight instrument and sensor housings, stainless steel heat exchanger cores, tube-to-fitting preform rings and RF and waveguide component brazing. In short: zinc-free vacuum silver braze; lower-temperature BVAg option; flux-free, clean fillets.
What is the yield strength of BVAg-31 Annealed?
BVAg-31 Annealed has a typical yield strength of 240 MPa (34.8 ksi) and a tensile strength of 420 MPa (60.9 ksi) — stronger than 73% of precious metal grades. Strength varies by condition: see the 2 listed tempers.
Is BVAg-31 Annealed easy to machine?
Not especially — machinability is rated fair (40/100, worse than 60% of precious metal grades). Rarely machined; the alloy is soft and gummy — use sharp, polished high-rake tools and collect all chips as precious-metal scrap.
Can BVAg-31 Annealed be welded?
Not readily — weldability is rated poor (30/100). Not a weld filler; joints are made by vacuum or dry-hydrogen furnace brazing at roughly 870–925 °C with a short soak to limit erosion of thin base metals.
What surface finishes work on BVAg-31 Annealed?
Fluxless brazing in vacuum leaves a bright, clean fillet needing no cleaning; if flux-brazed in air, remove residues with hot water/citric rinse before plating or passivation.
Can BVAg-31 Annealed be formed, bent or molded?
Excellent cold formability in the annealed state — drawn to fine wire, rolled to 25 µm foil and stamped into rings; interstage anneal near 650–700 °C in inert atmosphere.
What is the maximum service temperature of BVAg-31 Annealed?
BVAg-31 Annealed is rated for continuous use to about 450°C (842 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
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 (brazing filler metals) — ASM International (1993)
- Brazing Handbook, 5th ed. — American Welding Society (2007)
- Palladium-bearing silver braze alloy (Palcusil 10 type) technical data — brazing filler metal producers (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.