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AWS BNi-7 (N99710) Filler Metal

AWS BNi-7 is a nickel-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BNi-7 is the AWS designation for this material. N99710 is the UNS number.

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

The graph bars on the material properties cards below compare AWS BNi-7 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

0.3

Shear Modulus

67 GPa 9.7 x 106 psi

Tensile Strength: Ultimate (UTS)

550 MPa 80 x 103 psi

Thermal Properties

Brazing Temperature

930 to 1090 °C 1700 to 2000 °F

Latent Heat of Fusion

280 J/g

Melting Completion (Liquidus)

890 °C 1630 °F

Melting Onset (Solidus)

890 °C 1630 °F

Specific Heat Capacity

490 J/kg-K 0.12 BTU/lb-°F

Thermal Expansion

11 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

55 % relative

Density

8.0 g/cm3 500 lb/ft3

Embodied Carbon

8.8 kg CO2/kg material

Embodied Energy

120 MJ/kg 53 x 103 BTU/lb

Embodied Water

240 L/kg 29 gal/lb

Common Calculations

Stiffness to Weight: Axial

12 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

19 points

Strength to Weight: Bending

19 points

Thermal Shock Resistance

21 points

Alloy Composition

Nickel (Ni) 73.3 to 77.3
Chromium (Cr) 13 to 15
Phosphorus (P) 9.7 to 10.5
Iron (Fe) 0 to 0.2
Silicon (Si) 0 to 0.1
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
Manganese (Mn) 0 to 0.040
Sulfur (S) 0 to 0.020
Boron (B) 0 to 0.010
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