Nickel Alloy BNi-5 AS-BRAZED
Heat-treated state
UNS N99650, N99610 · ASTM A5.8 BNi-5 · ISO B-Ni5
Reference condition for design allowables: properties of the solidified filler/joint, thin-gap (0.025–0.075 mm) recommended to avoid brittle silicide centrelines.
Values for the AS-BRAZED condition
What is BNi-5 AS-BRAZED?
BNi-5 AS-BRAZED is BNi-5 heat treated to AS-BRAZED — reference condition for design allowables: properties of the solidified filler/joint, thin-gap (0.025–0.075 mm) recommended to avoid brittle silicide centrelines. BNi-5 AS-BRAZED has a tensile strength of 620 MPa (89.9 ksi), weaker than 68% of nickel alloy grades. Elongation at break is 2% and the elastic modulus is 195 GPa (28.3 Msi). BNi-5 AS-BRAZED has a density of 7.8 g/cm³ (0.282 lb/in³), lighter than 96% of nickel alloy grades. It melts at 1,080°C (1,976 °F).
Limitations
- Limited ductility — 2%, worse than 95% of nickel alloy grades
- Difficult to machine — 10/100, worse than 93% of nickel alloy grades
- Difficult to weld — 15/100, worse than 87% of nickel alloy grades
- Hard to polish — 60/100, worse than 84% of nickel alloy grades
BNi-5 AS-BRAZED properties
Typical room-temperature values for BNi-5 AS-BRAZED; 8 are specific to this condition. Other listed values are BNi-5 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
BNi-5 AS-BRAZED has a density of 7.8 g/cm³ (0.282 lb/in³), lighter than 96% of nickel alloy grades. It melts at 1,080°C (1,976 °F).
Mechanical8
BNi-5 AS-BRAZED has a tensile strength of 620 MPa (89.9 ksi), weaker than 68% of nickel alloy grades. Elongation at break is 2% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal5
BNi-5 AS-BRAZED is rated for continuous service to 980°C (1,796 °F). It conducts heat at 13 W/m·K (7.51 BTU/hr·ft·°F), better than 71% of nickel alloy grades. Thermal expansion is 13.5 µm/m·K (7.5 µin/in·°F).
Electrical2
BNi-5 AS-BRAZED has an electrical resistivity of 1.2×10⁻⁶ Ω·m.
Chemical & Environmental2
Corrosion resistance is very good (72/100), worse than 71% of nickel alloy grades.
Sustainability4
Producing a kilogram of BNi-5 AS-BRAZED takes about 165 MJ of energy and emits 13 kg of CO₂ — more than 54% of nickel alloy grades. Typical recycled content is 15%.
Manufacturability5
BNi-5 AS-BRAZED's machinability is not recommended (10/100, worse than 93% of nickel alloy grades); weldability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with BNi-5 AS-BRAZED
Is BNi-5 easy to machine?
The solidified deposit is hard and brittle (≈450 HV) — remove excess fillet by grinding or abrasive blasting rather than turning/milling.
Can BNi-5 be welded?
Not a fusion welding consumable; do not re-melt joints locally, and avoid subsequent weld heat above ~1000 °C near brazed seams.
Can BNi-5 be formed, bent or molded?
Supplied as powder, paste, tape or sintered preform; braze in vacuum (10⁻⁴ torr) or dry hydrogen at 1150–1205 °C with 0.025–0.075 mm joint clearance and slow binder burn-out below 500 °C.
What surface finishes work on BNi-5?
Joints can be passivated, aluminide/ diffusion coated or grit-blasted; the high-Cr deposit forms a protective Cr₂O₃ scale and needs no plating for oxidation service.
BNi-5 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 |
|---|---|---|
| Cr | 18.5 – 19.5 | 19 |
| Si | 9.75 – 10.5 | 10.1 |
| Bessentially boron-free — avoids boron diffusion/erosion of thin sections | ≤ 0.03 | 0.01 |
| C | ≤ 0.06 | 0.03 |
| Feresidual; some purchase specs restrict further | ≤ 0.5 | 0.2 |
| P | ≤ 0.02 | — |
| S | ≤ 0.02 | — |
| Al | ≤ 0.05 | — |
| Ti | ≤ 0.05 | — |
| Zr | ≤ 0.05 | — |
| Other (total) | ≤ 0.5 | — |
| Ni | balance | — |
BNi-5 AS-BRAZED — frequently asked
What is BNi-5 AS-BRAZED used for?
BNi-5 AS-BRAZED is typically used for gas turbine component brazing, high-temperature exhaust assemblies and corrosion-resistant joints. In short: highest-chromium nickel braze; 980 C service capability; no boride-free ductility gain.
What is the tensile strength of BNi-5 AS-BRAZED?
BNi-5 AS-BRAZED has a typical tensile strength of 620 MPa (89.9 ksi) — weaker than 68% of nickel alloy grades.
Is BNi-5 AS-BRAZED easy to machine?
Not especially — machinability is rated not recommended (10/100, worse than 93% of nickel alloy grades). The solidified deposit is hard and brittle (≈450 HV) — remove excess fillet by grinding or abrasive blasting rather than turning/milling.
Can BNi-5 AS-BRAZED be welded?
Not readily — weldability is rated poor (15/100). Not a fusion welding consumable; do not re-melt joints locally, and avoid subsequent weld heat above ~1000 °C near brazed seams.
What surface finishes work on BNi-5 AS-BRAZED?
Joints can be passivated, aluminide/ diffusion coated or grit-blasted; the high-Cr deposit forms a protective Cr₂O₃ scale and needs no plating for oxidation service.
Can BNi-5 AS-BRAZED be formed, bent or molded?
Supplied as powder, paste, tape or sintered preform; braze in vacuum (10⁻⁴ torr) or dry hydrogen at 1150–1205 °C with 0.025–0.075 mm joint clearance and slow binder burn-out below 500 °C.
What is the maximum service temperature of BNi-5 AS-BRAZED?
BNi-5 AS-BRAZED is rated for continuous use to about 980°C (1,796 °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)
- AMS 4782 Nickel Alloy Brazing Filler Metal, 19Cr 10Si — SAE International (2018)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering (Brazing Filler Metals) — ASM International (1993)
- AWS Brazing Handbook, 5th ed. — American Welding Society (2007)
- Nickel braze filler metal product data (powder/paste/tape forms) — Braze filler metal producers (e.g. Höganäs, Lucas-Milhaupt, Wall Colmonoy) (2023)
- GB/T 6418 (2008)
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.