# Soft Annealed (O60) C51100 Bronze

O60 C51100 bronze is C51100 bronze in the O60 (soft annealed) temper. It has the lowest strength and second highest ductility compared to the other variants of C51100 bronze. The graph bars on the material properties cards below compare O60 C51100 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* 16 *x 10 ^{6} psi*

Elongation at Break

42 *%*

Poisson's Ratio

0.34

Rockwell Superficial 30T Hardness

33

Shear Modulus

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

Shear Strength

230 *MPa* 33 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

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

Tensile Strength: Yield (Proof)

93 *MPa* 13 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

200 *J/g*

Maximum Temperature: Mechanical

190 *°C* 370 *°F*

Melting Completion (Liquidus)

1060 *°C* 1950 *°F*

Melting Onset (Solidus)

970 *°C* 1790 *°F*

Specific Heat Capacity

380 *J/kg-K* 0.090 *BTU/lb-°F*

Thermal Conductivity

84 *W/m-K* 49 *BTU/h-ft-°F*

Thermal Expansion

18 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

20 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

20 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

32 *% relative*

Density

8.9 *g/cm ^{3}* 550

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

48 *MJ/kg* 21 *x 10 ^{3} BTU/lb*

Embodied Water

340 *L/kg* 41 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

38 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.1 *points*

Stiffness to Weight: Bending

18 *points*

Strength to Weight: Axial

10 *points*

Strength to Weight: Bending

12 *points*

Thermal Diffusivity

25 *mm ^{2}/s*

Thermal Shock Resistance

12 *points*

## Alloy Composition

Cu | 93.8 to 96.5 | |

Sn | 3.5 to 4.9 | |

P | 0.030 to 0.35 | |

Zn | 0 to 0.3 | |

Fe | 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 B103: Standard Specification for Phosphor Bronze Plate, Sheet, Strip, and Rolled Bar

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