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UNS C77300 (RBCuZn-D) Filler Metal

C77300 nickel silver is a copper-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. RBCuZn-D is the AWS designation for this material. C77300 is the UNS number.

It has the highest tensile strength and a moderately high melting temperature among copper-based braze fillers.

The graph bars on the material properties cards below compare C77300 nickel silver to: copper-based braze fillers (top), all copper 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

110 GPa 16 x 106 psi

Poisson's Ratio

0.3

Shear Modulus

42 GPa 6.2 x 106 psi

Tensile Strength: Ultimate (UTS)

540 MPa 78 x 103 psi

Thermal Properties

Brazing Temperature

940 to 980 °C 1720 to 1800 °F

Latent Heat of Fusion

180 J/g

Maximum Temperature: Mechanical

130 °C 270 °F

Melting Completion (Liquidus)

940 °C 1720 °F

Melting Onset (Solidus)

920 °C 1690 °F

Specific Heat Capacity

390 J/kg-K 0.094 BTU/lb-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

5.5 % IACS

Electrical Conductivity: Equal Weight (Specific)

6.3 % IACS

Otherwise Unclassified Properties

Base Metal Price

26 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

3.5 kg CO2/kg material

Embodied Energy

56 MJ/kg 24 x 103 BTU/lb

Embodied Water

310 L/kg 38 gal/lb

Common Calculations

Stiffness to Weight: Axial

7.7 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

19 points

Strength to Weight: Bending

19 points

Thermal Shock Resistance

17 points

Alloy Composition

Copper (Cu) 46 to 50
Zinc (Zn) 37.9 to 45
Nickel (Ni) 9.0 to 11
Silicon (Si) 0.040 to 0.25
Phosphorus (P) 0 to 0.25
Lead (Pb) 0 to 0.050
Aluminum (Al) 0 to 0.010
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

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993