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AWS BNi-5a (N99651) Filler Metal

AWS BNi-5a is a nickel-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BNi-5a is the AWS designation for this material. N99651 is the UNS number.

It has a moderately low density and a fairly high melting temperature among nickel-based brazing fillers.

The graph bars on the material properties cards below compare AWS BNi-5a 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

190 GPa 27 x 106 psi

Poisson's Ratio

0.29

Shear Modulus

72 GPa 10 x 106 psi

Tensile Strength: Ultimate (UTS)

480 MPa 70 x 103 psi

Thermal Properties

Brazing Temperature

1150 to 1200 °C 2100 to 2200 °F

Latent Heat of Fusion

420 J/g

Melting Completion (Liquidus)

1150 °C 2100 °F

Melting Onset (Solidus)

1070 °C 1950 °F

Specific Heat Capacity

500 J/kg-K 0.12 BTU/lb-°F

Thermal Expansion

12 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

55 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

9.0 kg CO2/kg material

Embodied Energy

130 MJ/kg 55 x 103 BTU/lb

Embodied Water

260 L/kg 31 gal/lb

Common Calculations

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

17 points

Strength to Weight: Bending

17 points

Thermal Shock Resistance

15 points

Alloy Composition

Nickel (Ni) 70.1 to 73.5
Chromium (Cr) 18.5 to 19.5
Silicon (Si) 7.0 to 7.5
Boron (B) 1.0 to 1.5
Iron (Fe) 0 to 0.5
Carbon (C) 0 to 0.1
Cobalt (Co) 0 to 0.1
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