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UNS C76400 Nickel Silver

C76400 nickel silver is a copper-nickel alloy formulated for primary forming into wrought products. C76400 is the UNS number for this material. Additionally, the EN chemical designation is CuNi18Zn20. It can have a moderately high tensile strength among the wrought copper-nickels in the database.

The properties of C76400 nickel silver include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C76400 nickel silver to: wrought copper-nickels (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

120 GPa 18 x 106 psi

Poisson's Ratio

0.32

Shear Modulus

46 GPa 6.7 x 106 psi

Tensile Strength: Ultimate (UTS)

590 to 610 MPa 85 to 88 x 103 psi

Thermal Properties

Latent Heat of Fusion

200 J/g

Maximum Temperature: Mechanical

190 °C 370 °F

Melting Completion (Liquidus)

990 °C 1820 °F

Melting Onset (Solidus)

950 °C 1730 °F

Specific Heat Capacity

400 J/kg-K 0.095 BTU/lb-°F

Thermal Conductivity

31 W/m-K 18 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

5.7 % IACS

Electrical Conductivity: Equal Weight (Specific)

6.1 % IACS

Otherwise Unclassified Properties

Base Metal Price

32 % relative

Density

8.4 g/cm3 520 lb/ft3

Embodied Carbon

4.1 kg CO2/kg material

Embodied Energy

63 MJ/kg 27 x 103 BTU/lb

Embodied Water

300 L/kg 36 gal/lb

Common Calculations

Stiffness to Weight: Axial

8.1 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

19 to 20 points

Strength to Weight: Bending

18 to 19 points

Thermal Diffusivity

9.3 mm2/s

Thermal Shock Resistance

19 to 20 points

Alloy Composition

Among wrought copper alloys, the composition of C76400 nickel silver is notable for including manganese (Mn) and nickel (Ni). Manganese is used to improve strength without a proportional reduction in ductility. Nickel is used to improve strength (particularly at elevated temperatures) and corrosion resistance.

Copper (Cu) 58.5 to 61.5
Zinc (Zn) 17.7 to 25
Nickel (Ni) 16.5 to 19.5
Manganese (Mn) 0 to 0.5
Iron (Fe) 0 to 0.25
Lead (Pb) 0 to 0.050
Residuals 0 to 0.5

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM B151: Standard Specification for Copper-Nickel-Zinc Alloy (Nickel Silver) and Copper-Nickel Rod and Bar

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015