# Spring-Tempered (H08) C72800 Copper-Nickel

H08 C72800 copper-nickel is C72800 copper-nickel in the H08 (spring) temper. It has the lowest ductility compared to the other variants of C72800 copper-nickel. The graph bars on the material properties cards below compare H08 C72800 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

Elastic (Young's, Tensile) Modulus

120 *GPa* 17 *x 10 ^{6} psi*

Elongation at Break

3.9 *%*

Poisson's Ratio

0.34

Rockwell C Hardness

30

Shear Modulus

44 *GPa* 6.4 *x 10 ^{6} psi*

Shear Strength

550 *MPa* 80 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

960 *MPa* 140 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

910 *MPa* 130 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

210 *J/g*

Maximum Temperature: Mechanical

200 *°C* 390 *°F*

Melting Completion (Liquidus)

1080 *°C* 1980 *°F*

Melting Onset (Solidus)

920 *°C* 1680 *°F*

Specific Heat Capacity

380 *J/kg-K* 0.091 *BTU/lb-°F*

Thermal Conductivity

55 *W/m-K* 32 *BTU/h-ft-°F*

Thermal Expansion

17 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

11 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

11 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

38 *% relative*

Density

8.8 *g/cm ^{3}* 550

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

68 *MJ/kg* 29 *x 10 ^{3} BTU/lb*

Embodied Water

360 *L/kg* 44 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

37 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

3530 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.4 *points*

Stiffness to Weight: Bending

19 *points*

Strength to Weight: Axial

30 *points*

Strength to Weight: Bending

25 *points*

Thermal Diffusivity

17 *mm ^{2}/s*

Thermal Shock Resistance

34 *points*

## Alloy Composition

Cu | 78.3 to 82.8 | |

Ni | 9.5 to 10.5 | |

Sn | 7.5 to 8.5 | |

Zn | 0 to 1.0 | |

Fe | 0 to 0.5 | |

Nb | 0.1 to 0.3 | |

Mn | 0.050 to 0.3 | |

Mg | 0.0050 to 0.15 | |

Al | 0 to 0.1 | |

Si | 0 to 0.050 | |

Sb | 0 to 0.020 | |

Ti | 0 to 0.010 | |

Pb | 0 to 0.0050 | |

P | 0 to 0.0050 | |

S | 0 to 0.0025 | |

Bi | 0 to 0.0010 | |

B | 0 to 0.0010 | |

res. | 0 to 0.3 |

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