# UNS C77400 Nickel Silver

C77400 nickel silver is a copper-nickel alloy formulated for primary forming into wrought products. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C77400 is the UNS number for this material. Additionally, the common industry name is 45-10 Nickel Silver.

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

The graph bars on the material properties cards below compare C77400 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

25 *%*

Poisson's Ratio

0.3

Rockwell B Hardness

73

Shear Modulus

42 *GPa* 6.1 *x 10 ^{6} psi*

Shear Strength

360 *MPa* 53 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

570 *MPa* 83 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

250 *MPa* 36 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

170 *J/g*

Maximum Temperature: Mechanical

130 *°C* 260 *°F*

Melting Completion (Liquidus)

810 *°C* 1490 *°F*

Melting Onset (Solidus)

770 *°C* 1420 *°F*

Specific Heat Capacity

390 *J/kg-K* 0.094 *BTU/lb-°F*

Thermal Expansion

21 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

27 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

31 *% 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

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

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

120 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

290 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.7 *points*

Stiffness to Weight: Bending

20 *points*

Strength to Weight: Axial

20 *points*

Strength to Weight: Bending

19 *points*

Thermal Shock Resistance

18 *points*

## Alloy Composition

Among wrought copper alloys, the composition of C77400 nickel silver is notable for including nickel (Ni). Nickel is used to improve strength (particularly at elevated temperatures) and corrosion resistance.

Cu | 43 to 47 | |

Zn | 41.3 to 48 | |

Ni | 9.0 to 11 | |

Pb | 0 to 0.2 | |

res. | 0 to 0.5 |

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

## Followup Questions

## Similar Alloys

## Further Reading

ASTM B124: Standard Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes

ASTM B283: Standard Specification for Copper and Copper-Alloy Die Forgings (Hot-Pressed)

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001