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AWS BNi-8 (N99800) Filler Metal

AWS BNi-8 is a nickel-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BNi-8 is the AWS designation for this material. N99800 is the UNS number.

It has the lowest base cost among nickel-based brazing fillers. In addition, it has a moderately low embodied energy and a moderately low density.

The graph bars on the material properties cards below compare AWS BNi-8 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

0.32

Shear Modulus

67 GPa 9.8 x 106 psi

Tensile Strength: Ultimate (UTS)

570 MPa 83 x 103 psi

Thermal Properties

Brazing Temperature

1010 to 1090 °C 1850 to 2000 °F

Latent Heat of Fusion

390 J/g

Melting Completion (Liquidus)

1010 °C 1850 °F

Melting Onset (Solidus)

980 °C 1800 °F

Specific Heat Capacity

480 J/kg-K 0.12 BTU/lb-°F

Thermal Expansion

13 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

46 % relative

Density

7.9 g/cm3 500 lb/ft3

Embodied Carbon

8.2 kg CO2/kg material

Embodied Energy

120 MJ/kg 50 x 103 BTU/lb

Embodied Water

220 L/kg 27 gal/lb

Common Calculations

Stiffness to Weight: Axial

12 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

20 points

Strength to Weight: Bending

19 points

Thermal Shock Resistance

17 points

Alloy Composition

Nickel (Ni) 61.6 to 68.5
Manganese (Mn) 21.5 to 24.5
Silicon (Si) 6.0 to 8.0
Copper (Cu) 4.0 to 5.0
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

Further Reading

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