Nickel Alloy BNi-6 AS-BRAZED
Heat-treated state
UNS N99700 · ISO B-Ni6
Reference condition for joint design: strength values are lap/butt joint data on austenitic stainless, not bulk filler properties.
Values for the AS-BRAZED condition
What is BNi-6 AS-BRAZED?
BNi-6 AS-BRAZED is BNi-6 heat treated to AS-BRAZED — reference condition for joint design: strength values are lap/butt joint data on austenitic stainless, not bulk filler properties. The elastic modulus is 130 GPa (18.9 Msi). BNi-6 AS-BRAZED has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 97% of nickel alloy grades. It melts at 875°C (1,607 °F).
Limitations
- Low stiffness — 130 GPa (18.9 Msi), worse than 99% of nickel alloy grades
- Hard to polish — 50/100, worse than 98% of nickel alloy grades
- Needs corrosion protection — 35/100, worse than 96% of nickel alloy grades
- Difficult to weld — 10/100, worse than 94% of nickel alloy grades
- Difficult to machine — 10/100, worse than 93% of nickel alloy grades
BNi-6 AS-BRAZED properties
Typical room-temperature values for BNi-6 AS-BRAZED; 5 are specific to this condition. Other listed values are BNi-6 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
BNi-6 AS-BRAZED has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 97% of nickel alloy grades. It melts at 875°C (1,607 °F).
Mechanical4
The elastic modulus is 130 GPa (18.9 Msi).
Thermal5
BNi-6 AS-BRAZED is rated for continuous service to 425°C (797 °F). It conducts heat at 10 W/m·K (5.78 BTU/hr·ft·°F), worse than 88% of nickel alloy grades. Thermal expansion is 13 µm/m·K (7.22 µin/in·°F).
Electrical2
BNi-6 AS-BRAZED has an electrical resistivity of 1×10⁻⁶ Ω·m.
Chemical & Environmental2
Corrosion resistance is fair (35/100), worse than 96% of nickel alloy grades.
Sustainability4
Producing a kilogram of BNi-6 AS-BRAZED takes about 155 MJ of energy and emits 13 kg of CO₂ — less than 58% of nickel alloy grades. Typical recycled content is 10%.
Manufacturability4
BNi-6 AS-BRAZED's machinability is not recommended (10/100, worse than 93% of nickel alloy grades); weldability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with BNi-6 AS-BRAZED
Is BNi-6 easy to machine?
Solidified BNi-6 is a hard, brittle Ni₃P eutectic — remove excess fillet by grinding or blending, not by turning or milling.
Can BNi-6 be welded?
Do not fusion weld over or through a BNi-6 joint; phosphorus pickup causes hot cracking in the weld metal.
Can BNi-6 be formed, bent or molded?
Supplied only as powder, paste or bonded preform — the alloy cannot be drawn to wire or rolled to ductile foil.
What surface finishes work on BNi-6?
Self-fluxing, so no flux residue in vacuum/hydrogen brazing; passivate stainless assemblies after brazing but avoid strong oxidising acids that attack the Cr-free fillet.
BNi-6 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 |
|---|---|---|
| Peutectic-forming element; gives single melting point ~875 °C | 10 – 12 | 11 |
| C | ≤ 0.1 | 0.03 |
| Si | ≤ 0.1 | |
| Femaximum (residual) | ≤ 0.2 | |
| S | ≤ 0.02 | |
| Other (total)sum of residuals per AWS A5.8 | ≤ 0.5 | |
| Nibalance, nominally ~89 % | balance |
BNi-6 AS-BRAZED — frequently asked
What is BNi-6 AS-BRAZED used for?
BNi-6 AS-BRAZED is typically used for low-temperature nickel brazing, corrosion-resistant electronic joints, instrument and sensor assemblies, thin-wall stainless steel components, vacuum-brazed fittings for moderate temperature and heat exchanger plate joints. In short: self-fluxing Ni-P braze; low brazing temperature; 425 C service ceiling.
Is BNi-6 AS-BRAZED easy to machine?
Not especially — machinability is rated not recommended (10/100, worse than 93% of nickel alloy grades). Solidified BNi-6 is a hard, brittle Ni₃P eutectic — remove excess fillet by grinding or blending, not by turning or milling.
Can BNi-6 AS-BRAZED be welded?
Not readily — weldability is rated not recommended (10/100). Do not fusion weld over or through a BNi-6 joint; phosphorus pickup causes hot cracking in the weld metal.
What surface finishes work on BNi-6 AS-BRAZED?
Self-fluxing, so no flux residue in vacuum/hydrogen brazing; passivate stainless assemblies after brazing but avoid strong oxidising acids that attack the Cr-free fillet.
Can BNi-6 AS-BRAZED be formed, bent or molded?
Supplied only as powder, paste or bonded preform — the alloy cannot be drawn to wire or rolled to ductile foil.
What is the maximum service temperature of BNi-6 AS-BRAZED?
BNi-6 AS-BRAZED is rated for continuous use to about 425°C (797 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- AWS A5.8M/A5.8 Specification for Filler Metals for Brazing and Braze Welding — American Welding Society (2019)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering (nickel braze filler metals) — ASM International (1993)
- AWS Brazing Handbook, 5th ed. — American Welding Society (2007)
- Nickel braze filler metal powder/paste datasheets (BNi-6, Ni-11P) — Braze-alloy producers (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.