Precious Metal BAg-9 Hard
Supply condition
UNS P07650 · GB BAg65CuZn
Hard = cold drawn / hard temper wire and strip
Pick for spring-back rings, self-supporting preforms and automatic feeding where stiffer wire is needed; anneals out on heating to brazing temperature.
Values for the Hard condition
Other BAg-9 tempers and conditions
BAg-9 is listed in 3 conditions; see the grade overview at BAg-9.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As built (as printed) | Properties of the solidified fillet/joint after brazing at 718–843 °C — use for joint design allowables rather than wire data. | 150 | 340 | 25 | 80 HB | 22 % IACS |
ANNDefault Annealed | Standard stock condition for BAg-9 wire, rod, strip and preforms — soft and ductile for coiling, cutting and preform stamping. | 170 | 380 | 32 | 85 HB | 22 % IACS |
HardThis page Cold drawn / hard temper wire and strip | Pick for spring-back rings, self-supporting preforms and automatic feeding where stiffer wire is needed; anneals out on heating to brazing temperature. | 520 | 620 | 4 | 155 HB | 21 % IACS |
What is BAg-9 Hard?
BAg-9 Hard is BAg-9 supplied in the Hard condition — pick for spring-back rings, self-supporting preforms and automatic feeding where stiffer wire is needed; anneals out on heating to brazing temperature. BAg-9 Hard has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 97% of precious metal grades. Elongation at break is 4% and the elastic modulus is 85 GPa (12.3 Msi). BAg-9 Hard has a density of 9.8 g/cm³ (0.354 lb/in³), lighter than 75% of precious metal grades. It melts at 671°C (1,240 °F). ANN is the default condition FabDigit quotes; Hard is available on request or by drawing note.
Advantages
- High strength — 520 MPa (75.4 ksi), better than 97% of precious metal grades
- Low embodied carbon — 70 kg CO₂/kg, better than 76% of precious metal grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 100% of precious metal grades
- Limited ductility — 4%, worse than 93% of precious metal grades
- Limited formability — 45/100, worse than 91% of precious metal grades
BAg-9 Hard properties
Typical room-temperature values for BAg-9 Hard; 19 are specific to this condition. Other listed values are BAg-9 reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
BAg-9 Hard has a density of 9.8 g/cm³ (0.354 lb/in³), lighter than 75% of precious metal grades. It melts at 671°C (1,240 °F).
Mechanical13
BAg-9 Hard has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 97% of precious metal grades. Elongation at break is 4% and the elastic modulus is 85 GPa (12.3 Msi).
Thermal6
BAg-9 Hard is rated for continuous service to 150°C (302 °F). It conducts heat at 95 W/m·K (54.9 BTU/hr·ft·°F), better than 51% of precious metal grades. Thermal expansion is 19 µm/m·K (10.6 µin/in·°F).
Electrical3
BAg-9 Hard conducts electricity at 21 % IACS, better than 57% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is very good (82/100), better than 53% of precious metal grades.
Sustainability4
Producing a kilogram of BAg-9 Hard takes about 1,100 MJ of energy and emits 70 kg of CO₂ — less than 71% of precious metal grades. Typical recycled content is 60%.
Manufacturability8
BAg-9 Hard's machinability is fair (50/100, better than 74% of precious metal grades); weldability poor (30/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with BAg-9 Hard
Is BAg-9 easy to machine?
Rarely machined — gummy and smearing; use sharp, high-rake tools, light feeds and collect all chips for silver recovery.
Can BAg-9 be welded?
Not a structural weld metal; join with torch, induction, furnace or resistance brazing at 718–843 °C with a fast heat-up to limit zinc loss.
Can BAg-9 be formed, bent or molded?
Annealed material draws to fine wire and rolls to thin strip easily; stamped ring/washer preforms are standard, interanneal after heavy reductions.
What surface finishes work on BAg-9?
Bright, near-sterling-white fillets polish and buff readily; pickle off flux residues immediately, and expect gradual sulfide tarnish in industrial air.
BAg-9 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 P07650 | 64 – 66 | 65 |
| Cu | 19 – 21 | 20 |
| Cdcadmium-free classification limit | ≤ 0.01 | — |
| Other (total)total of all other elements | ≤ 0.15 | — |
| Zn | ≥ 13 (balance) | — |
BAg-9 Hard — frequently asked
What is BAg-9 Hard used for?
BAg-9 Hard is typically used for jewelry and flatware brazing, food service equipment and decorative metalwork. In short: 65% silver, cadmium-free; near-sterling color match; highly formable filler.
What is the yield strength of BAg-9 Hard?
BAg-9 Hard has a typical yield strength of 520 MPa (75.4 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 97% of precious metal grades. Strength varies by condition: see the 3 listed tempers.
Is BAg-9 Hard easy to machine?
Reasonably — machinability is rated fair (50/100, better than 74% of precious metal grades). Rarely machined — gummy and smearing; use sharp, high-rake tools, light feeds and collect all chips for silver recovery.
Can BAg-9 Hard be welded?
Not readily — weldability is rated poor (30/100). Not a structural weld metal; join with torch, induction, furnace or resistance brazing at 718–843 °C with a fast heat-up to limit zinc loss.
What surface finishes work on BAg-9 Hard?
Bright, near-sterling-white fillets polish and buff readily; pickle off flux residues immediately, and expect gradual sulfide tarnish in industrial air.
Can BAg-9 Hard be formed, bent or molded?
Annealed material draws to fine wire and rolls to thin strip easily; stamped ring/washer preforms are standard, interanneal after heavy reductions.
What is the maximum service temperature of BAg-9 Hard?
BAg-9 Hard is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between BAg-9-ANN and BAg-9 Hard?
ANN is the default condition — standard stock condition for BAg-9 wire, rod, strip and preforms — soft and ductile for coiling, cutting and preform stamping. Hard: pick for spring-back rings, self-supporting preforms and automatic feeding where stiffer wire is needed; anneals out on heating to brazing temperature. Yield strength is 170 MPa in ANN versus 520 MPa in Hard.
Sources
- AWS A5.8/A5.8M Specification for Filler Metals for Brazing and Braze Welding — AWS (2019)
- GB/T 10046 (2018)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering — ASM International (1993)
- Silver brazing filler metal datasheets (BAg series) — Lucas-Milhaupt / Handy & Harman (2023)
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.