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UNS C76200 (CW405J) Nickel Silver

C76200 nickel silver is a copper-nickel alloy formulated for primary forming into wrought products. CW405J is the EN numeric designation for this material. C76200 is the UNS number. Additionally, the EN chemical designation is CuNi12Zn29. And the common industry name is 59-12 Nickel Silver. Older literature may refer to this material as ASTM Nickel Silver 8, but this is now discouraged.

The properties of C76200 nickel silver include seven common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C76200 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 17 x 106 psi

Poisson's Ratio

0.31

Rockwell B Hardness

28 to 99

Rockwell Superficial 30T Hardness

66 to 91

Shear Modulus

44 GPa 6.4 x 106 psi

Tensile Strength: Ultimate (UTS)

390 to 790 MPa 57 to 110 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

170 °C 330 °F

Melting Completion (Liquidus)

1030 °C 1880 °F

Melting Onset (Solidus)

980 °C 1800 °F

Specific Heat Capacity

390 J/kg-K 0.094 BTU/lb-°F

Thermal Conductivity

45 W/m-K 26 BTU/h-ft-°F

Thermal Expansion

19 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

9.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.8 % IACS

Otherwise Unclassified Properties

Base Metal Price

29 % relative

Density

8.2 g/cm3 520 lb/ft3

Embodied Carbon

3.6 kg CO2/kg material

Embodied Energy

57 MJ/kg 25 x 103 BTU/lb

Embodied Water

310 L/kg 37 gal/lb

Common Calculations

Stiffness to Weight: Axial

7.8 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

13 to 27 points

Strength to Weight: Bending

14 to 23 points

Thermal Diffusivity

14 m2/s

Thermal Shock Resistance

13 to 26 points

Alloy Composition

Among wrought copper alloys, the composition of C76200 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) 57 to 61
Zinc (Zn) 24.2 to 32
Nickel (Ni) 11 to 13.5
Manganese (Mn) 0 to 0.5
Iron (Fe) 0 to 0.25
Lead (Pb) 0 to 0.1
Residuals 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

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