# UNS C79600 Leaded Nickel Silver

C79600 nickel silver is a copper-nickel alloy formulated for primary forming into wrought products. Cited properties are appropriate for the H04 (full hard) temper.

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

The graph bars on the material properties cards below compare C79600 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

15 *%*

Poisson's Ratio

0.3

Rockwell B Hardness

70

Shear Modulus

43 *GPa* 6.2 *x 10 ^{6} psi*

Shear Strength

290 *MPa* 43 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

480 *MPa* 70 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

300 *MPa* 43 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

180 *J/g*

Maximum Temperature: Mechanical

130 *°C* 270 *°F*

Melting Completion (Liquidus)

930 *°C* 1700 *°F*

Melting Onset (Solidus)

880 *°C* 1620 *°F*

Specific Heat Capacity

390 *J/kg-K* 0.093 *BTU/lb-°F*

Thermal Conductivity

36 *W/m-K* 21 *BTU/h-ft-°F*

Thermal Expansion

21 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

7.0 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

8.0 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

25 *% relative*

Density

7.9 *g/cm ^{3}* 490

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

57 *MJ/kg* 24 *x 10 ^{3} BTU/lb*

Embodied Water

310 *L/kg* 38 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

63 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

400 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.8 *points*

Stiffness to Weight: Bending

20 *points*

Strength to Weight: Axial

17 *points*

Strength to Weight: Bending

17 *points*

Thermal Diffusivity

12 *mm ^{2}/s*

Thermal Shock Resistance

15 *points*

## Alloy Composition

Among wrought copper alloys, the composition of C79600 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.

Cu | 43.5 to 46.5 | |

Zn | 38.3 to 45.2 | |

Ni | 9.0 to 11 | |

Mn | 1.5 to 2.5 | |

Pb | 0.8 to 1.2 | |

res. | 0 to 0.5 |

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

## Followup Questions

## Similar Alloys

## Further Reading

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