Nickel Alloy BNi-1a DIFF-BRAZED
Heat-treated state
UNS N99610 · ISO B-Ni1a
Pick when joint ductility and re-melt temperature must be raised by diffusing boron into the base metal.
Values for the DIFF-BRAZED condition
Other BNi-1a tempers and conditions
BNi-1a is listed in 2 conditions; see the grade overview at BNi-1a.
- DIFF-BRAZED
- AS-BRAZED
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
DIFF-BRAZEDThis page extended hold above solidus (e.g. 1100–1175 °C, 2–24 h) to disperse boron | Pick when joint ductility and re-melt temperature must be raised by diffusing boron into the base metal. | 390 | 620 | 3 | 32 HRC | 1.8 % IACS |
furnace brazed 1066–1177 °C, vacuum or dry H₂, no diffusion cycle | Baseline joint condition: highest as-made hardness and wear resistance, but centreline borides limit ductility. | 460 | 480 | 0.5 | 46 HRC | 1.4 % IACS |
What is BNi-1a DIFF-BRAZED?
BNi-1a DIFF-BRAZED is BNi-1a heat treated to DIFF-BRAZED — pick when joint ductility and re-melt temperature must be raised by diffusing boron into the base metal. BNi-1a DIFF-BRAZED has a tensile strength of 620 MPa (89.9 ksi), weaker than 68% of nickel alloy grades. Elongation at break is 3% and the elastic modulus is 205 GPa (29.7 Msi). BNi-1a DIFF-BRAZED has a density of 7.9 g/cm³ (0.285 lb/in³), lighter than 92% of nickel alloy grades. It melts at 977°C (1,791 °F).
Advantages
- Conducts heat well — 17 W/m·K (9.82 BTU/hr·ft·°F), better than 84% of nickel alloy grades
- High service temperature — 1,050°C (1,922 °F), better than 83% of nickel alloy grades
- High electrical conductivity — 1.8 % IACS, better than 82% of nickel alloy grades
Limitations
- Hard to polish — 55/100, worse than 95% of nickel alloy grades
- Limited ductility — 3%, worse than 93% of nickel alloy grades
- Limited formability — 12/100, worse than 83% of nickel alloy grades
- Needs corrosion protection — 68/100, worse than 82% of nickel alloy grades
- Difficult to weld — 25/100, worse than 82% of nickel alloy grades
BNi-1a DIFF-BRAZED properties
Typical room-temperature values for BNi-1a DIFF-BRAZED; 22 are specific to this condition. Other listed values are BNi-1a reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
BNi-1a DIFF-BRAZED has a density of 7.9 g/cm³ (0.285 lb/in³), lighter than 92% of nickel alloy grades. It melts at 977°C (1,791 °F).
Mechanical11
BNi-1a DIFF-BRAZED has a tensile strength of 620 MPa (89.9 ksi), weaker than 68% of nickel alloy grades. Elongation at break is 3% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
BNi-1a DIFF-BRAZED is rated for continuous service to 1,050°C (1,922 °F). It conducts heat at 17 W/m·K (9.82 BTU/hr·ft·°F), better than 84% of nickel alloy grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
BNi-1a DIFF-BRAZED conducts electricity at 1.8 % IACS, better than 82% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is good (68/100), worse than 82% of nickel alloy grades.
Sustainability4
Producing a kilogram of BNi-1a DIFF-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%.
Manufacturability8
BNi-1a DIFF-BRAZED's machinability is poor (15/100, worse than 76% of nickel alloy grades); weldability poor (25/100); formability not recommended (12/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with BNi-1a DIFF-BRAZED
Is BNi-1a easy to machine?
The solidified fillet is boride-hardened to ~45 HRC and is realistically grind- or EDM-only; design joints so no post-braze cutting crosses the braze line.
Can BNi-1a be welded?
Not a fusion-welding consumable — re-melting or welding over a BNi-1a joint readily produces hot cracks; repair by re-brazing instead.
Can BNi-1a be formed, bent or molded?
Supplied as powder, paste, tape or amorphous foil; only the rapidly solidified foil can be cut and formed, the bulk alloy is brittle.
What surface finishes work on BNi-1a?
Braze fillets take a bright finish by grinding and lapping; avoid pickling in strong acids which preferentially attack boride phases, and keep faying surfaces oxide-free before brazing.
BNi-1a 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 borides | 2.75 – 3.5 | 3.1 |
| Si | 4 – 5 | 4.5 |
| Fe | 4 – 5 | 4.5 |
| Ckey difference vs BNi-1 (0.06–0.20 C) | ≤ 0.06 | 0.03 |
| P | ≤ 0.02 | — |
| S | ≤ 0.02 | — |
| Al | ≤ 0.05 | — |
| Ti | ≤ 0.05 | — |
| Zr | ≤ 0.05 | — |
| Co | ≤ 0.1 | — |
| Se | ≤ 0.01 | — |
| Other (total) | ≤ 0.5 | — |
| Ni | balance | — |
BNi-1a DIFF-BRAZED — frequently asked
What is BNi-1a DIFF-BRAZED used for?
BNi-1a DIFF-BRAZED is typically used for furnace component brazing, carbide tool tip attachment and wear surfacing repairs. In short: lower-carbon BNi-1 variant; available as amorphous foil; joints usable to 980 °C.
What is the tensile strength of BNi-1a DIFF-BRAZED?
BNi-1a DIFF-BRAZED has a typical tensile strength of 620 MPa (89.9 ksi) — weaker than 68% of nickel alloy grades. Strength varies by condition: see the 2 listed tempers.
Is BNi-1a DIFF-BRAZED easy to machine?
Not especially — machinability is rated poor (15/100, worse than 76% of nickel alloy grades). The solidified fillet is boride-hardened to ~45 HRC and is realistically grind- or EDM-only; design joints so no post-braze cutting crosses the braze line.
Can BNi-1a DIFF-BRAZED be welded?
Not readily — weldability is rated poor (25/100). Not a fusion-welding consumable — re-melting or welding over a BNi-1a joint readily produces hot cracks; repair by re-brazing instead.
What surface finishes work on BNi-1a DIFF-BRAZED?
Braze fillets take a bright finish by grinding and lapping; avoid pickling in strong acids which preferentially attack boride phases, and keep faying surfaces oxide-free before brazing.
Can BNi-1a DIFF-BRAZED be formed, bent or molded?
Supplied as powder, paste, tape or amorphous foil; only the rapidly solidified foil can be cut and formed, the bulk alloy is brittle.
What is the maximum service temperature of BNi-1a DIFF-BRAZED?
BNi-1a DIFF-BRAZED is rated for continuous use to about 1,050°C (1,922 °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)
- Brazing Handbook, 5th ed. — American Welding Society (2007)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering — ASM International (1993)
- Nickel brazing filler metal (Ni-Cr-B-Si) product data — Wall Colmonoy / Lucas-Milhaupt / Metglas (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.