UNS C76200 (CW405J) Nickel Silver

C76200 nickel silver is an alloy of copper, further classified as a nickel silver. CW405J is the EN numeric designation for this material. C76200 is the UNS number. Additionally, the EN chemical designation is CuNi12Zn29. And the industry name is 59-12 Nickel Silver.

It has seven common variants, each represented as a separate material.

Material Properties

Base Metal Price49 % rel

Density8.4 g/cm3 (520 lb/ft3)

Elastic (Young's, Tensile) Modulus120 GPa (17 x 106 psi)

Electrical Conductivity9.0 % IACS

Electrical Resistivity Order of Magnitude-7 10x Ω-m

Melting Onset (Solidus)980 °C (1800 °F)

Poisson's Ratio0.31

Rockwell B Hardness28 to 99

Shear Modulus47 GPa (6.8 x 106 psi)

Specific Heat Capacity380 J/kg-K

Strength to Weight Ratio46 to 94 kN-m/kg

Tensile Strength: Ultimate (UTS)390 to 790 MPa (57 to 110 x 103 psi)

Thermal Conductivity45 W/m-K

Thermal Diffusivity14

Thermal Expansion19 µm/m-K

Alloy Composition

Copper (Cu)57 to 61 %

Zinc (Zn)24.2 to 32 %

Nickel (Ni)11 to 13.5 %

Residuals0 to 0.5 %

Manganese (Mn)0 to 0.5 %

Iron (Fe)0 to 0.25 %

Lead (Pb)0 to 0.1 %

Further Reading

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

ASTM B122: Standard Specification for Copper-Nickel-Tin Alloy, Copper-Nickel-Zinc Alloy (Nickel Silver), and Copper-Nickel Alloy Plate, Sheet, Strip, and Rolled Bar

Copper: Its Trade, Manufacture, Use, and Environmental Status, Gunter Joseph, 2001

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

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