# UNS C70700 (CuNi10) Copper-Nickel

C70700 copper-nickel is a copper-nickel alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. CuNi10 is the EN chemical designation for this material. C70700 is the UNS number.

It has a moderately low tensile strength among the wrought copper-nickels in the database.

The graph bars on the material properties cards below compare C70700 copper-nickel 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

Brinell Hardness

73

Elastic (Young's, Tensile) Modulus

120 *GPa* 18 *x 10 ^{6} psi*

Elongation at Break

39 *%*

Poisson's Ratio

0.34

Shear Modulus

46 *GPa* 6.7 *x 10 ^{6} psi*

Shear Strength

220 *MPa* 32 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

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

Tensile Strength: Yield (Proof)

110 *MPa* 16 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

220 *J/g*

Maximum Temperature: Mechanical

220 *°C* 430 *°F*

Melting Completion (Liquidus)

1120 *°C* 2050 *°F*

Melting Onset (Solidus)

1060 *°C* 1950 *°F*

Specific Heat Capacity

390 *J/kg-K* 0.093 *BTU/lb-°F*

Thermal Conductivity

59 *W/m-K* 34 *BTU/h-ft-°F*

Thermal Expansion

16 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

11 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

12 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

34 *% relative*

Density

8.9 *g/cm ^{3}* 560

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

52 *MJ/kg* 22 *x 10 ^{3} BTU/lb*

Embodied Water

300 *L/kg* 36 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

100 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

51 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.6 *points*

Stiffness to Weight: Bending

19 *points*

Strength to Weight: Axial

10 *points*

Strength to Weight: Bending

12 *points*

Thermal Diffusivity

17 *mm ^{2}/s*

Thermal Shock Resistance

12 *points*

## Alloy Composition

Among wrought copper alloys, the composition of C70700 copper-nickel 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 | 88.5 to 90.5 | |

Ni | 9.5 to 10.5 | |

Mn | 0 to 0.5 | |

Fe | 0 to 0.050 | |

res. | 0 to 0.5 |

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

## Followup Questions

## Similar Alloys

## Further Reading

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

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