Nickel Alloy BNi-9 AS-BRAZED
Heat-treated state
UNS N99612 · ISO B-Ni9
Baseline joint condition after 1065–1205 °C vacuum braze cycle; strong but boride-embrittled if gaps are wide.
Values for the AS-BRAZED condition
Other BNi-9 tempers and conditions
BNi-9 is listed in 3 conditions; see the grade overview at BNi-9.
- SINTERED-PREFORM
- AS-BRAZED
- DIFFUSION
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Sintered preform / ring (binder-free pressed and sintered powder) | Pick for high-purity vacuum brazing with no binder residue and exact filler volume per joint. | — | 55 | 0 | 42 HRC | 1.2 % IACS |
AS-BRAZEDThis page solidified joint deposit (no diffusion cycle) | Baseline joint condition after 1065–1205 °C vacuum braze cycle; strong but boride-embrittled if gaps are wide. | 460 | 550 | 1 | 52 HRC | 1.4 % IACS |
Diffusion brazed / post-braze diffusion heat treated | Extended hold (e.g. 4–24 h at 1040–1200 °C) redistributes boron, dissolves centreline borides and raises joint ductility and creep life. | 520 | 700 | 4 | 39 HRC | 1.5 % IACS |
What is BNi-9 AS-BRAZED?
BNi-9 AS-BRAZED is BNi-9 heat treated to AS-BRAZED — baseline joint condition after 1065–1205 °C vacuum braze cycle; strong but boride-embrittled if gaps are wide. BNi-9 AS-BRAZED has a tensile strength of 550 MPa (79.8 ksi), weaker than 77% of nickel alloy grades. Elongation at break is 1% and the elastic modulus is 200 GPa (29 Msi). BNi-9 AS-BRAZED has a density of 7.9 g/cm³ (0.285 lb/in³), lighter than 92% of nickel alloy grades. It melts at 1,055°C (1,931 °F).
Advantages
- Conducts heat well — 14 W/m·K (8.09 BTU/hr·ft·°F), better than 77% of nickel alloy grades
Limitations
- Difficult to machine — 5/100, worse than 99% of nickel alloy grades
- Limited formability — 2/100, worse than 99% of nickel alloy grades
- Limited ductility — 1%, worse than 98% of nickel alloy grades
- Hard to polish — 55/100, worse than 95% of nickel alloy grades
- Difficult to weld — 10/100, worse than 94% of nickel alloy grades
BNi-9 AS-BRAZED properties
Typical room-temperature values for BNi-9 AS-BRAZED; 22 are specific to this condition. Other listed values are BNi-9 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
BNi-9 AS-BRAZED has a density of 7.9 g/cm³ (0.285 lb/in³), lighter than 92% of nickel alloy grades. It melts at 1,055°C (1,931 °F).
Mechanical6
BNi-9 AS-BRAZED has a tensile strength of 550 MPa (79.8 ksi), weaker than 77% of nickel alloy grades. Elongation at break is 1% and the elastic modulus is 200 GPa (29 Msi).
Thermal5
BNi-9 AS-BRAZED is rated for continuous service to 950°C (1,742 °F). It conducts heat at 14 W/m·K (8.09 BTU/hr·ft·°F), better than 77% of nickel alloy grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical2
BNi-9 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.
Sustainability3
Producing a kilogram of BNi-9 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 5%.
Manufacturability5
BNi-9 AS-BRAZED's machinability is not recommended (5/100, worse than 99% of nickel alloy grades); weldability not recommended (10/100); formability not recommended (2/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with BNi-9 AS-BRAZED
Is BNi-9 easy to machine?
Solidified deposit is hard and brittle — remove excess fillet by grinding or EDM rather than turning/milling.
Can BNi-9 be welded?
Not a fusion-welding filler; boron pickup in a fusion weld over a BNi-9 joint causes hot cracking, so machine out old braze before welding repairs.
Can BNi-9 be formed, bent or molded?
Supplied only as powder, paste, tape or sintered preform; braze at 1065–1205 °C in vacuum (≤10⁻³ mbar) or dry hydrogen with joint gaps 0.025–0.075 mm.
What surface finishes work on BNi-9?
Grit-blast/clean and passivate the parent alloy; the high-Cr deposit forms a protective oxide in service and needs no plating, though aluminide/Pt-Al coatings can be applied over diffused joints.
BNi-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 |
|---|---|---|
| Cr | 13.5 – 16.5 | 15 |
| Bmelting point depressant; diffuses rapidly into base metal | 3.25 – 4 | 3.6 |
| C | ≤ 0.06 | — |
| Si | ≤ 0.1 | — |
| Fe | ≤ 0.2 | — |
| Al | ≤ 0.05 | — |
| Ti | ≤ 0.05 | — |
| Zr | ≤ 0.05 | — |
| P | ≤ 0.02 | — |
| S | ≤ 0.02 | — |
| Others (total) | ≤ 0.5 | — |
| Ni | balance | — |
BNi-9 AS-BRAZED — frequently asked
What is BNi-9 AS-BRAZED used for?
BNi-9 AS-BRAZED is typically used for superalloy turbine repair brazing, aerospace hot-section component joints, turbine vane and nozzle segment brazing, combustor hardware braze repair, high-temperature corrosion-resistant furnace joints and overhaul of gas turbine static structures. In short: high-chromium superalloy braze filler; service to 980 °C; vacuum or hydrogen brazing only.
What is the tensile strength of BNi-9 AS-BRAZED?
BNi-9 AS-BRAZED has a typical tensile strength of 550 MPa (79.8 ksi) — weaker than 77% of nickel alloy grades. Strength varies by condition: see the 3 listed tempers.
Is BNi-9 AS-BRAZED easy to machine?
Not especially — machinability is rated not recommended (5/100, worse than 99% of nickel alloy grades). Solidified deposit is hard and brittle — remove excess fillet by grinding or EDM rather than turning/milling.
Can BNi-9 AS-BRAZED be welded?
Not readily — weldability is rated not recommended (10/100). Not a fusion-welding filler; boron pickup in a fusion weld over a BNi-9 joint causes hot cracking, so machine out old braze before welding repairs.
What surface finishes work on BNi-9 AS-BRAZED?
Grit-blast/clean and passivate the parent alloy; the high-Cr deposit forms a protective oxide in service and needs no plating, though aluminide/Pt-Al coatings can be applied over diffused joints.
Can BNi-9 AS-BRAZED be formed, bent or molded?
Supplied only as powder, paste, tape or sintered preform; braze at 1065–1205 °C in vacuum (≤10⁻³ mbar) or dry hydrogen with joint gaps 0.025–0.075 mm.
What is the maximum service temperature of BNi-9 AS-BRAZED?
BNi-9 AS-BRAZED is rated for continuous use to about 950°C (1,742 °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 — AWS (2019)
- ASTM/SAE Unified Numbering System (UNS N99612) — SAE/ASTM (2017)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering (nickel-base brazing filler metals) — ASM International (1993)
- Nickel-base braze filler metal datasheets (powder/paste/tape/preform forms) — Braze filler producers (e.g. Höganäs/Wall Colmonoy/Lucas-Milhaupt class data) (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.