Nickel Alloy BNi-1 BRAZE-DIFF
Heat-treated state
UNS N99600 · ISO B-Ni1 · also Nicrobraz 150
Pick when boron must be diffused out of the joint centre to reduce the continuous boride network and raise joint ductility and creep life.
Values for the BRAZE-DIFF condition
Other BNi-1 tempers and conditions
BNi-1 is listed in 2 conditions; see the grade overview at BNi-1.
- BRAZE-DIFF
- AS-BRAZED
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
BRAZE-DIFFThis page extended hold below solidus | Pick when boron must be diffused out of the joint centre to reduce the continuous boride network and raise joint ductility and creep life. | 480 | 620 | 3 | 43 HRC | 1.8 % IACS |
AS-BRAZEDDefault furnace-brazed joint, as-solidified | Default state of a vacuum or dry-hydrogen furnace braze at 1066–1204 °C; hard, erosion-resistant, essentially non-ductile joint. | 500 | 550 | 1 | 52 HRC | 1.6 % IACS |
What is BNi-1 BRAZE-DIFF?
BNi-1 BRAZE-DIFF is BNi-1 heat treated to BRAZE-DIFF — pick when boron must be diffused out of the joint centre to reduce the continuous boride network and raise joint ductility and creep life. BNi-1 BRAZE-DIFF has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 70% of nickel alloy grades. Elongation at break is 3% and the elastic modulus is 203 GPa (29.4 Msi). BNi-1 BRAZE-DIFF has a density of 7.89 g/cm³ (0.285 lb/in³), lighter than 94% of nickel alloy grades. It melts at 977°C (1,791 °F). AS-BRAZED is the default condition FabDigit quotes; BRAZE-DIFF is available on request or by drawing note.
Advantages
- Conducts heat well — 18 W/m·K (10.4 BTU/hr·ft·°F), better than 85% of nickel alloy grades
- High electrical conductivity — 1.8 % IACS, better than 82% of nickel alloy grades
Limitations
- Low fracture toughness — 35 MPa·√m (31.9 ksi·√in), worse than 98% of nickel alloy grades
- Limited ductility — 3%, worse than 93% of nickel alloy grades
- Difficult to machine — 10/100, worse than 93% of nickel alloy grades
- Difficult to weld — 12/100, worse than 90% of nickel alloy grades
- Limited formability — 6/100, worse than 88% of nickel alloy grades
BNi-1 BRAZE-DIFF properties
Typical room-temperature values for BNi-1 BRAZE-DIFF; 22 are specific to this condition. Other listed values are BNi-1 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
BNi-1 BRAZE-DIFF has a density of 7.89 g/cm³ (0.285 lb/in³), lighter than 94% of nickel alloy grades. It melts at 977°C (1,791 °F).
Mechanical16
BNi-1 BRAZE-DIFF has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 70% of nickel alloy grades. Elongation at break is 3% and the elastic modulus is 203 GPa (29.4 Msi).
Thermal6
BNi-1 BRAZE-DIFF is rated for continuous service to 950°C (1,742 °F). It conducts heat at 18 W/m·K (10.4 BTU/hr·ft·°F), better than 85% of nickel alloy grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
BNi-1 BRAZE-DIFF conducts electricity at 1.8 % IACS, better than 82% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 87% of nickel alloy grades.
Sustainability4
Producing a kilogram of BNi-1 BRAZE-DIFF takes about 200 MJ of energy and emits 15 kg of CO₂ — more than 78% of nickel alloy grades. Typical recycled content is 10%.
Manufacturability8
BNi-1 BRAZE-DIFF's machinability is not recommended (10/100, worse than 93% of nickel alloy grades); weldability not recommended (12/100); formability not recommended (6/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with BNi-1 BRAZE-DIFF
Is BNi-1 easy to machine?
Solidified filler is boride-hardened and effectively unmachinable — remove excess by grinding, EDM or abrasive blasting, never by turning or drilling.
Can BNi-1 be welded?
Do not fusion weld the joint; boron promotes hot cracking — repair by cleaning and re-brazing, and keep filler away from areas to be later welded.
Can BNi-1 be formed, bent or molded?
Supplied as powder, paste, tape or sintered preform; free-flowing at 1066–1204 °C in vacuum or dry hydrogen with clearances of 0.025–0.075 mm, and it will erode thin sections by boron diffusion if held too long.
What surface finishes work on BNi-1?
Brazed surfaces can be passivated, aluminized or coated with the parent alloy; plating adheres poorly to boride-rich fillets and polishing gives slight phase relief.
BNi-1 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 – 15 | 14 |
| Bmelting-point depressant, forms hard borides | 2.75 – 3.5 | 3.1 |
| Si | 4 – 5 | 4.5 |
| Fe | 4 – 5 | 4.5 |
| Chigh-carbon version; BNi-1a limits C to 0.06 max | 0.6 – 0.9 | 0.75 |
| P | ≤ 0.02 | — |
| S | ≤ 0.02 | — |
| Al | ≤ 0.05 | — |
| Ti | ≤ 0.05 | — |
| Zr | ≤ 0.05 | — |
| Other (total)max total of other elements | ≤ 0.5 | — |
| Nibalance, nominally ~73 % | balance | — |
BNi-1 BRAZE-DIFF — frequently asked
What is BNi-1 BRAZE-DIFF used for?
BNi-1 BRAZE-DIFF is typically used for stellite/carbide overlay joints, aerospace honeycomb structures, wear-resistant furnace parts and vacuum furnace brazing of stainless steel. In short: hardest nickel braze filler; erosion-resistant brazed joints; service to 900 °C.
What is the yield strength of BNi-1 BRAZE-DIFF?
BNi-1 BRAZE-DIFF has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 70% of nickel alloy grades. Strength varies by condition: see the 2 listed tempers.
Is BNi-1 BRAZE-DIFF easy to machine?
Not especially — machinability is rated not recommended (10/100, worse than 93% of nickel alloy grades). Solidified filler is boride-hardened and effectively unmachinable — remove excess by grinding, EDM or abrasive blasting, never by turning or drilling.
Can BNi-1 BRAZE-DIFF be welded?
Not readily — weldability is rated not recommended (12/100). Do not fusion weld the joint; boron promotes hot cracking — repair by cleaning and re-brazing, and keep filler away from areas to be later welded.
What surface finishes work on BNi-1 BRAZE-DIFF?
Brazed surfaces can be passivated, aluminized or coated with the parent alloy; plating adheres poorly to boride-rich fillets and polishing gives slight phase relief.
Can BNi-1 BRAZE-DIFF be formed, bent or molded?
Supplied as powder, paste, tape or sintered preform; free-flowing at 1066–1204 °C in vacuum or dry hydrogen with clearances of 0.025–0.075 mm, and it will erode thin sections by boron diffusion if held too long.
What is the maximum service temperature of BNi-1 BRAZE-DIFF?
BNi-1 BRAZE-DIFF 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 — American Welding Society (2019)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering — ASM International (1993)
- AWS Brazing Handbook, 5th ed. — American Welding Society (2007)
- Nicrobraz nickel brazing filler metal data sheets — Wall Colmonoy (2022)
- Brazing alloy powders and pastes (Ni-Cr-B-Si) technical data — Höganäs / Lucas-Milhaupt (2021)
- GB/T 10859 — SAC (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.