# UNS C77100 Nickel Silver

C77100 nickel silver is a copper-nickel alloy formulated for primary forming into wrought products. Cited properties are appropriate for the H02 (half hard) temper. It has a moderately low base cost and a moderately high tensile strength among wrought copper-nickels.

The graph bars on the material properties cards below compare C77100 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*

Poisson's Ratio

0.31

Shear Modulus

45 *GPa* 6.5 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

600 *MPa* 88 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

540 *MPa* 78 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

180 *J/g*

Maximum Temperature: Mechanical

150 *°C* 300 *°F*

Melting Completion (Liquidus)

990 *°C* 1820 *°F*

Melting Onset (Solidus)

950 *°C* 1740 *°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

20 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

7.6 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

8.5 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

27 *% relative*

Density

8.1 *g/cm ^{3}* 500

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

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

Embodied Water

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

## Common Calculations

Resilience: Unit (Modulus of Resilience)

1280 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.8 *points*

Stiffness to Weight: Bending

20 *points*

Strength to Weight: Axial

21 *points*

Strength to Weight: Bending

20 *points*

Thermal Diffusivity

13 *mm ^{2}/s*

Thermal Shock Resistance

19 *points*

## Alloy Composition

Among wrought copper alloys, the composition of C77100 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 | 52 to 56 | |

Zn | 30.6 to 39 | |

Ni | 9.0 to 12 | |

Mn | 0 to 0.9 | |

Pb | 0 to 0.030 | |

res. | 0 to 0.5 |

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