# 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 10 ^{6} psi*

Elongation at Break

43 *%*

Poisson's Ratio

0.31

Shear Modulus

39 *GPa* 5.7 *x 10 ^{6} psi*

Shear Strength

240 *MPa* 35 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

350 *MPa* 51 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

120 *MPa* 17 *x 10 ^{3} 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/cm ^{3}* 510

*lb/ft*

^{3}Embodied Carbon

2.9 *kg CO _{2}/kg material*

Embodied Energy

48 *MJ/kg* 21 *x 10 ^{3} BTU/lb*

Embodied Water

320 *L/kg* 38 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

120 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

63 *kJ/m ^{3}*

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 *mm ^{2}/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.

Cu | 62 to 66 | |

Zn | 29.6 to 36 | |

Ni | 2.0 to 4.0 | |

Fe | 0 to 0.050 | |

Pb | 0 to 0.050 | |

res. | 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