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UNS C74400 Nickel Silver

C74400 nickel silver is a copper-nickel alloy formulated for primary forming into wrought products. Cited properties are appropriate for the O60 (soft annealed) temper.

It has a moderately low base cost among wrought copper-nickels. In addition, it has a moderately high thermal conductivity and a moderately low melting temperature.

The graph bars on the material properties cards below compare C74400 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

110 GPa 16 x 106 psi

Elongation at Break

43 %

Poisson's Ratio

0.31

Shear Modulus

39 GPa 5.7 x 106 psi

Shear Strength

240 MPa 35 x 103 psi

Tensile Strength: Ultimate (UTS)

350 MPa 51 x 103 psi

Tensile Strength: Yield (Proof)

120 MPa 17 x 103 psi

Thermal Properties

Latent Heat of Fusion

180 J/g

Maximum Temperature: Mechanical

140 °C 280 °F

Melting Completion (Liquidus)

930 °C 1710 °F

Melting Onset (Solidus)

910 °C 1670 °F

Specific Heat Capacity

390 J/kg-K 0.093 BTU/lb-°F

Thermal Conductivity

120 W/m-K 67 BTU/h-ft-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

26 % IACS

Electrical Conductivity: Equal Weight (Specific)

29 % IACS

Otherwise Unclassified Properties

Base Metal Price

25 % relative

Density

8.2 g/cm3 510 lb/ft3

Embodied Carbon

2.9 kg CO2/kg material

Embodied Energy

48 MJ/kg 21 x 103 BTU/lb

Embodied Water

320 L/kg 38 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

120 MJ/m3

Resilience: Unit (Modulus of Resilience)

63 kJ/m3

Stiffness to Weight: Axial

7.4 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

12 points

Strength to Weight: Bending

14 points

Thermal Diffusivity

37 mm2/s

Thermal Shock Resistance

12 points

Alloy Composition

Among wrought copper alloys, the composition of C74400 nickel silver is notable for including nickel (Ni). Nickel is used to improve strength (particularly at elevated temperatures) and corrosion resistance.

Copper (Cu) 62 to 66
Zinc (Zn) 29.6 to 36
Nickel (Ni) 2.0 to 4.0
Iron (Fe) 0 to 0.050
Lead (Pb) 0 to 0.050
Residuals 0 to 0.3

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

Followup Questions

Similar Alloys

Further Reading

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015