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AWS BNi-4 (N99640) Filler Metal

AWS BNi-4 is a nickel-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BNi-4 is the AWS designation for this material. N99640 is the UNS number.

It has a fairly low tensile strength among nickel-based brazing fillers. In addition, it has a moderately high density and a moderately high embodied energy.

The graph bars on the material properties cards below compare AWS BNi-4 to: nickel-based brazing fillers (top), all nickel alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

180 GPa 26 x 106 psi

Poisson's Ratio

0.31

Shear Modulus

67 GPa 9.8 x 106 psi

Tensile Strength: Ultimate (UTS)

430 MPa 62 x 103 psi

Thermal Properties

Brazing Temperature

1010 to 1180 °C 1850 to 2150 °F

Latent Heat of Fusion

340 J/g

Melting Completion (Liquidus)

1070 °C 1950 °F

Melting Onset (Solidus)

980 °C 1800 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Expansion

11 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

60 % relative

Density

8.5 g/cm3 530 lb/ft3

Embodied Carbon

10 kg CO2/kg material

Embodied Energy

140 MJ/kg 60 x 103 BTU/lb

Embodied Water

220 L/kg 26 gal/lb

Common Calculations

Stiffness to Weight: Axial

12 points

Stiffness to Weight: Bending

22 points

Strength to Weight: Axial

14 points

Strength to Weight: Bending

15 points

Thermal Shock Resistance

16 points

Alloy Composition

Nickel (Ni) 91.4 to 95.5
Silicon (Si) 3.0 to 4.0
Boron (B) 1.5 to 2.2
Iron (Fe) 0 to 1.5
Cobalt (Co) 0 to 0.1
Carbon (C) 0 to 0.060
Aluminum (Al) 0 to 0.050
Titanium (Ti) 0 to 0.050
Zirconium (Zr) 0 to 0.050
Phosphorus (P) 0 to 0.020
Sulfur (S) 0 to 0.020
Selenium (Se) 0 to 0.0050
Residuals 0 to 0.5

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

AWS A5.8: Specification for Filler Metals for Brazing and Braze Welding