# UNS C77600 Nickel Silver

C77600 nickel silver is a copper-nickel alloy formulated for primary forming into wrought products. Cited properties are appropriate for the M30 (as hot extruded) condition.

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

The graph bars on the material properties cards below compare C77600 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

30 *%*

Poisson's Ratio

0.3

Rockwell B Hardness

83

Shear Modulus

43 *GPa* 6.3 *x 10 ^{6} psi*

Shear Strength

410 *MPa* 60 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

630 *MPa* 91 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

320 *MPa* 47 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

180 *J/g*

Maximum Temperature: Mechanical

140 *°C* 280 *°F*

Melting Completion (Liquidus)

830 *°C* 1530 *°F*

Melting Onset (Solidus)

790 *°C* 1450 *°F*

Specific Heat Capacity

390 *J/kg-K* 0.094 *BTU/lb-°F*

Thermal Expansion

20 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

27 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

31 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

27 *% relative*

Density

7.9 *g/cm ^{3}* 490

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

60 *MJ/kg* 26 *x 10 ^{3} BTU/lb*

Embodied Water

310 *L/kg* 37 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

160 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

470 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.9 *points*

Stiffness to Weight: Bending

20 *points*

Strength to Weight: Axial

22 *points*

Strength to Weight: Bending

21 *points*

Thermal Shock Resistance

20 *points*

## Alloy Composition

Among wrought copper alloys, the composition of C77600 nickel silver is notable for including manganese (Mn) and tin (Sn). Manganese is used to improve strength without a proportional reduction in ductility. Tin is used to improve strength, bearing properties, and corrosion resistance against certain types of media.

Cu | 42 to 45 | |

Zn | 39.7 to 46 | |

Ni | 12 to 14 | |

Mn | 0 to 0.25 | |

Pb | 0 to 0.25 | |

Fe | 0 to 0.2 | |

Sn | 0 to 0.15 | |

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