# Soft Annealed (O60) C63800 Bronze

O60 C63800 bronze is C63800 bronze in the O60 (soft annealed) temper. It has the lowest strength and highest ductility compared to the other variants of C63800 bronze. The graph bars on the material properties cards below compare O60 C63800 bronze to: wrought bronzes (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* 17 *x 10 ^{6} psi*

Elongation at Break

41 *%*

Poisson's Ratio

0.34

Shear Modulus

43 *GPa* 6.2 *x 10 ^{6} psi*

Shear Strength

320 *MPa* 46 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

460 *MPa* 67 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

140 *MPa* 20 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

240 *J/g*

Maximum Temperature: Mechanical

200 *°C* 400 *°F*

Melting Completion (Liquidus)

1030 *°C* 1880 *°F*

Melting Onset (Solidus)

1000 *°C* 1830 *°F*

Specific Heat Capacity

410 *J/kg-K* 0.1 *BTU/lb-°F*

Thermal Conductivity

40 *W/m-K* 23 *BTU/h-ft-°F*

Thermal Expansion

17 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

10 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

10 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

30 *% relative*

Density

8.6 *g/cm ^{3}* 540

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

45 *MJ/kg* 19 *x 10 ^{3} BTU/lb*

Embodied Water

330 *L/kg* 39 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

150 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

85 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.4 *points*

Stiffness to Weight: Bending

19 *points*

Strength to Weight: Axial

15 *points*

Strength to Weight: Bending

15 *points*

Thermal Diffusivity

11 *mm ^{2}/s*

Thermal Shock Resistance

17 *points*

## Alloy Composition

Cu | 92.4 to 95.8 | |

Al | 2.5 to 3.1 | |

Si | 1.5 to 2.1 | |

Co | 0.25 to 0.55 | |

Zn | 0 to 0.8 | |

Ni | 0 to 0.2 | |

Fe | 0 to 0.2 | |

Mn | 0 to 0.1 | |

Pb | 0 to 0.050 | |

res. | 0 to 0.5 |

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

## Followup Questions

## Further Reading

ASTM B422: Standard Specification for Copper-Aluminum-Silicon-Cobalt Alloy, Copper-Nickel-Silicon-Magnesium Alloy, Copper-Nickel-Silicon Alloy, Copper-Nickel-Aluminum-Magnesium Alloy, and Copper- Nickel-Tin Alloy Sheet and Strip

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