# UNS C53800 Leaded Phosphor Bronze

C53800 bronze is a bronze formulated for primary forming into wrought products. Cited properties are appropriate for the H08 (spring) temper. It has the highest base cost among wrought bronzes. In addition, it has the lowest melting temperature and the lowest heat capacity.

The graph bars on the material properties cards below compare C53800 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* 15 *x 10 ^{6} psi*

Elongation at Break

2.3 *%*

Poisson's Ratio

0.34

Shear Modulus

40 *GPa* 5.8 *x 10 ^{6} psi*

Shear Strength

470 *MPa* 69 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

830 *MPa* 120 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

660 *MPa* 95 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

190 *J/g*

Maximum Temperature: Mechanical

160 *°C* 320 *°F*

Melting Completion (Liquidus)

980 *°C* 1800 *°F*

Melting Onset (Solidus)

800 *°C* 1470 *°F*

Specific Heat Capacity

360 *J/kg-K* 0.087 *BTU/lb-°F*

Thermal Conductivity

61 *W/m-K* 35 *BTU/h-ft-°F*

Thermal Expansion

18 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

9.0 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

9.3 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

37 *% relative*

Density

8.7 *g/cm ^{3}* 550

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

64 *MJ/kg* 28 *x 10 ^{3} BTU/lb*

Embodied Water

420 *L/kg* 50 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

18 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

2020 *kJ/m ^{3}*

Stiffness to Weight: Axial

6.8 *points*

Stiffness to Weight: Bending

18 *points*

Strength to Weight: Axial

26 *points*

Strength to Weight: Bending

22 *points*

Thermal Diffusivity

19 *mm ^{2}/s*

Thermal Shock Resistance

31 *points*

## Alloy Composition

Among wrought copper alloys, the composition of C53800 bronze is notable for including manganese (Mn) and tin (Sn). Manganese is used to improve strength without a proportional reduction in ductility. Tin is used to improve strength, bearing properties, and corrosion resistance against certain types of media.

Cu | 85.1 to 86.5 | |

Sn | 13.1 to 13.9 | |

Pb | 0.4 to 0.6 | |

Zn | 0 to 0.12 | |

Mn | 0 to 0.060 | |

Ni | 0 to 0.030 | |

Fe | 0 to 0.030 | |

res. | 0 to 0.2 |

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