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
| Ni | 61.6 to 68.5 | |
| Mn | 21.5 to 24.5 | |
| Si | 6.0 to 8.0 | |
| Cu | 4.0 to 5.0 | |
| Co | 0 to 0.1 | |
| C | 0 to 0.060 | |
| Al | 0 to 0.050 | |
| Ti | 0 to 0.050 | |
| Zr | 0 to 0.050 | |
| P | 0 to 0.020 | |
| S | 0 to 0.020 | |
| Se | 0 to 0.0050 | |
| res. | 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