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UNS C75200 (CW409J) Nickel Silver

C75200 nickel silver is a copper-nickel alloy formulated for primary forming into wrought products. CW409J is the EN numeric designation for this material. C75200 is the UNS number. Additionally, the British Standard (BS) designation is NS106. And the common industry name is 65-18-17. Older literature may refer to this material as ASTM Nickel Silver Type 2, but this is now discouraged.

The properties of C75200 nickel silver include six 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 C75200 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


Rockwell B Hardness

63 to 93

Rockwell Superficial 30T Hardness

58 to 78

Shear Modulus

47 GPa 6.8 x 106 psi

Tensile Strength: Ultimate (UTS)

400 to 660 MPa 58 to 96 x 103 psi

Thermal Properties

Latent Heat of Fusion

210 J/g

Maximum Temperature: Mechanical

200 °C 390 °F

Melting Completion (Liquidus)

1110 °C 2030 °F

Melting Onset (Solidus)

1070 °C 1960 °F

Specific Heat Capacity

400 J/kg-K 0.095 BTU/lb-°F

Thermal Conductivity

33 W/m-K 19 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

6.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

6.3 % IACS

Otherwise Unclassified Properties

Base Metal Price

33 % relative


8.5 g/cm3 530 lb/ft3

Embodied Carbon

4.1 kg CO2/kg material

Embodied Energy

62 MJ/kg 27 x 103 BTU/lb

Embodied Water

300 L/kg 36 gal/lb

Common Calculations

Stiffness to Weight: Axial

8.0 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

13 to 21 points

Strength to Weight: Bending

14 to 20 points

Thermal Diffusivity

9.8 mm2/s

Thermal Shock Resistance

13 to 22 points

Alloy Composition

Among wrought copper alloys, the composition of C75200 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)Cu 63.5 to 66.5
Nickel (Ni)Ni 16.5 to 19.5
Zinc (Zn)Zn 12.7 to 20
Manganese (Mn)Mn 0 to 0.5
Iron (Fe)Fe 0 to 0.25
Lead (Pb)Pb 0 to 0.050
Residualsres. 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

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