Nickel Alloy BNi-1a
UNS N99610 · ISO B-Ni1a
BNi-1a (UNS N99610) is a lower-carbon version of the high-chromium Ni-Cr-B-Si brazing filler, with a melting point of 977 °C and a density of 7.9 g/cm³.
Reference datasheet — BNi-1a is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
BNi-1a tempers and conditions
BNi-1a is supplied in 2 conditions, soft to hard.
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
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 |
Supply forms, finishes and certifications
Ways BNi-1a is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
FOIL | Amorphous foil | Supply form |
PASTE | Powder pre-mixed with organic/water-based binder in syringe or cartridge | Printing process |
POWDERDefault | Gas-atomized braze powder | Printing process |
TAPE | Transfer tape / flexible preform | Printing process |
What is BNi-1a?
BNi-1a (UNS N99610) is a lower-carbon version of the high-chromium Ni-Cr-B-Si brazing filler, with a melting point of 977 °C and a density of 7.9 g/cm³. The reduced carbon gives slightly better ductility while retaining boride hardening at about 45 HRC, and brazed joints serve to 980 °C. It is supplied as powder, paste, tape and rapidly solidified amorphous foil, so preplaced foil preforms are practical for repeat production. The fillet remains brittle and grind- or EDM-only; use BNi-2 where flow and gap filling matter more than joint hardness. BNi-1a 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). BNi-1a has a tensile strength of 480 MPa (69.6 ksi), weaker than 89% of nickel alloy grades. Elongation at break is 0.5% and the elastic modulus is 200 GPa (29 Msi).
What is BNi-1a used for?
- furnace component brazing
- carbide tool tip attachment
- wear surfacing repairs
Advantages
- Conducts heat well — 15 W/m·K (8.67 BTU/hr·ft·°F), better than 81% of nickel alloy grades
Limitations
- Limited ductility — 0.5%, worse than 99% of nickel alloy grades
- Difficult to machine — 8/100, worse than 96% of nickel alloy grades
- Hard to polish — 55/100, worse than 95% of nickel alloy grades
- Limited formability — 5/100, worse than 91% of nickel alloy grades
- Needs corrosion protection — 60/100, worse than 89% of nickel alloy grades
BNi-1a properties
Typical room-temperature values; bars are the position among nickel alloy grades.
Physical3
BNi-1a 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 has a tensile strength of 480 MPa (69.6 ksi), weaker than 89% of nickel alloy grades. Elongation at break is 0.5% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
BNi-1a is rated for continuous service to 980°C (1,796 °F). It conducts heat at 15 W/m·K (8.67 BTU/hr·ft·°F), better than 81% of nickel alloy grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
BNi-1a conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 89% of nickel alloy grades.
Sustainability4
Producing a kilogram of BNi-1a 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's machinability is not recommended (8/100, worse than 96% of nickel alloy grades); weldability poor (15/100); formability not recommended (5/100).
Common Calculations4
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the nickel alloy family
Yield strength against density for every nickel alloy grade FabDigit runs. BNi-1a is highlighted; hover a dot for its name, or open the interactive family chart.
Working with BNi-1a
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.
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 |
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.
Surface treatments FabDigit runs on nickel alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Nickel Alloy BNi-1a in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N99610
- ISO
- B-Ni1a
How much does BNi-1a cost?
BNi-1a is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
BNi-1a — frequently asked
What is BNi-1a used for?
BNi-1a is typically used for furnace component brazing, carbide tool tip attachment and wear surfacing repairs. In short: lower-carbon BNi-1 variant; available as amorphous foil; joints usable to 980 °C.
What is the tensile strength of BNi-1a?
BNi-1a has a typical tensile strength of 480 MPa (69.6 ksi) — weaker than 89% of nickel alloy grades. Strength varies by condition: see the 2 listed tempers.
Is BNi-1a easy to machine?
Not especially — machinability is rated not recommended (8/100, worse than 96% of nickel alloy grades). The solidified fillet is boride-hardened to ~45 HRC and is realistically grind- or EDM-only; design joints so no post-braze cutting crosses the braze line.
Can BNi-1a be welded?
Not readily — weldability is rated poor (15/100). Not a fusion-welding consumable — re-melting or welding over a BNi-1a joint readily produces hot cracks; repair by re-brazing instead.
What surface finishes work on BNi-1a?
Braze fillets take a bright finish by grinding and lapping; avoid pickling in strong acids which preferentially attack boride phases, and keep faying surfaces oxide-free before brazing.
Can BNi-1a be formed, bent or molded?
Supplied as powder, paste, tape or amorphous foil; only the rapidly solidified foil can be cut and formed, the bulk alloy is brittle.
What is the maximum service temperature of BNi-1a?
BNi-1a is rated for continuous use to about 980°C (1,796 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does BNi-1a cost?
BNi-1a is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.