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UNS C77000 (CW410J) Nickel Silver

C77000 nickel silver is a copper-nickel alloy formulated for primary forming into wrought products. CW410J is the EN numeric designation for this material. C77000 is the UNS number. Additionally, the EN chemical designation is CuNi18Zn27. The British Standard (BS) designation is NS107. And the common industry name is 55-18 Nickel Silver. Older literature may refer to this material as ASTM Nickel Silver 4, but this is now discouraged.

It has a moderately low electrical conductivity among the wrought copper-nickels in the database.

The properties of C77000 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 C77000 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

52 to 99

Rockwell Superficial 30T Hardness

49 to 90

Shear Modulus

46 GPa 6.7 x 106 psi

Tensile Strength: Ultimate (UTS)

420 to 800 MPa 60 to 120 x 103 psi

Thermal Properties

Latent Heat of Fusion

200 J/g

Maximum Temperature: Mechanical

180 °C 360 °F

Melting Completion (Liquidus)

1050 °C 1930 °F

Melting Onset (Solidus)

1000 °C 1840 °F

Specific Heat Capacity

400 J/kg-K 0.095 BTU/lb-°F

Thermal Conductivity

29 W/m-K 17 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

5.5 % IACS

Electrical Conductivity: Equal Weight (Specific)

6.0 % IACS

Otherwise Unclassified Properties

Base Metal Price

31 % relative

Density

8.3 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

14 to 27 points

Strength to Weight: Bending

15 to 23 points

Thermal Diffusivity

8.8 mm2/s

Thermal Shock Resistance

15 to 28 points

Alloy Composition

Among wrought copper alloys, the composition of C77000 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) 53.5 to 56.5
Zinc (Zn) 22.7 to 30
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

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