# UNS C61800 (CW305G) Aluminum Bronze

C61800 bronze is a bronze formulated for primary forming into wrought products. Cited properties are appropriate for the H02 (half hard) temper. CW305G is the EN numeric designation for this material. C61800 is the UNS number. Additionally, the EN chemical designation is CuAl10Fe1. And the British Standard (BS) designation is CA103.

It has a moderately high heat capacity among wrought bronzes. In addition, it has a moderately high melting temperature and a fairly high tensile strength.

The graph bars on the material properties cards below compare C61800 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

26 *%*

Fatigue Strength

190 *MPa* 27 *x 10 ^{3} psi*

Poisson's Ratio

0.34

Rockwell B Hardness

89

Shear Modulus

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

Shear Strength

310 *MPa* 45 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

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

Tensile Strength: Yield (Proof)

310 *MPa* 45 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

230 *J/g*

Maximum Temperature: Mechanical

220 *°C* 430 *°F*

Melting Completion (Liquidus)

1050 *°C* 1910 *°F*

Melting Onset (Solidus)

1040 *°C* 1900 *°F*

Specific Heat Capacity

440 *J/kg-K* 0.1 *BTU/lb-°F*

Thermal Conductivity

64 *W/m-K* 37 *BTU/h-ft-°F*

Thermal Expansion

18 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

13 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

14 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

28 *% relative*

Density

8.3 *g/cm ^{3}* 520

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

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

Embodied Water

390 *L/kg* 47 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

150 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

420 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.5 *points*

Stiffness to Weight: Bending

19 *points*

Strength to Weight: Axial

25 *points*

Strength to Weight: Bending

22 *points*

Thermal Diffusivity

18 *mm ^{2}/s*

Thermal Shock Resistance

26 *points*

## Alloy Composition

Among wrought copper alloys, the composition of C61800 bronze is notable for including aluminum (Al) and silicon (Si). Aluminum is used to add strength and oxidation resistance. Silicon is used to increase strength at the expense of ductility. It also lowers the melting temperature and raises the fluidity of the alloy.

Cu | 86.9 to 91 | |

Al | 8.5 to 11 | |

Fe | 0.5 to 1.5 | |

Si | 0 to 0.1 | |

Pb | 0 to 0.020 | |

Zn | 0 to 0.020 | |

res. | 0 to 0.5 |

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