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UNS C75700 (CW403J) Nickel Silver

C75700 nickel silver is a copper-nickel alloy formulated for primary forming into wrought products. CW403J is the EN numeric designation for this material. C75700 is the UNS number. Additionally, the EN chemical designation is CuNi12Zn24. The British Standard (BS) designation is NS104. And the common industry name is 65-12 Nickel Silver.

It can have a moderately high tensile strength among the wrought copper-nickels in the database.

The properties of C75700 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 C75700 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

Elongation at Break

3.2 to 22 %

Poisson's Ratio

0.32

Shear Modulus

45 GPa 6.5 x 106 psi

Shear Strength

350 to 370 MPa 51 to 53 x 103 psi

Tensile Strength: Ultimate (UTS)

590 to 610 MPa 85 to 88 x 103 psi

Tensile Strength: Yield (Proof)

470 to 580 MPa 68 to 84 x 103 psi

Thermal Properties

Latent Heat of Fusion

200 J/g

Maximum Temperature: Mechanical

180 °C 350 °F

Melting Completion (Liquidus)

1040 °C 1900 °F

Melting Onset (Solidus)

990 °C 1810 °F

Specific Heat Capacity

390 J/kg-K 0.094 BTU/lb-°F

Thermal Conductivity

40 W/m-K 23 BTU/h-ft-°F

Thermal Expansion

16 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

8.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.6 % IACS

Otherwise Unclassified Properties

Base Metal Price

30 % relative

Density

8.4 g/cm3 520 lb/ft3

Embodied Carbon

3.6 kg CO2/kg material

Embodied Energy

56 MJ/kg 24 x 103 BTU/lb

Embodied Water

310 L/kg 37 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

19 to 120 MJ/m3

Resilience: Unit (Modulus of Resilience)

930 to 1410 kJ/m3

Stiffness to Weight: Axial

7.8 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

19 to 20 points

Strength to Weight: Bending

19 points

Thermal Diffusivity

12 mm2/s

Thermal Shock Resistance

22 to 23 points

Alloy Composition

Among wrought copper alloys, the composition of C75700 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) 63.5 to 66.5
Zinc (Zn) 19.2 to 25.5
Nickel (Ni) 11 to 13
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