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AWS BNi-3 (N99630) Filler Metal

AWS BNi-3 is a nickel-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BNi-3 is the AWS designation for this material. N99630 is the UNS number.

It has a fairly low tensile strength and a moderately high embodied energy among nickel-based brazing fillers.

The graph bars on the material properties cards below compare AWS BNi-3 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

170 GPa 25 x 106 psi

Poisson's Ratio

0.31

Shear Modulus

66 GPa 9.6 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

350 J/g

Melting Completion (Liquidus)

1040 °C 1900 °F

Melting Onset (Solidus)

980 °C 1800 °F

Specific Heat Capacity

480 J/kg-K 0.12 BTU/lb-°F

Thermal Expansion

10 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

60 % relative

Density

8.3 g/cm3 520 lb/ft3

Embodied Carbon

9.9 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

17 points

Alloy Composition

Nickel (Ni) 90.1 to 93.3
Silicon (Si) 4.0 to 5.0
Boron (B) 2.8 to 3.5
Iron (Fe) 0 to 0.5
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