# UNS C64210 Aluminum-Silicon Bronze

C64210 bronze is a bronze formulated for primary forming into wrought products. It has a moderately low thermal conductivity and a moderately high ductility among wrought bronzes.

The properties of C64210 bronze include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C64210 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

35 *%*

Poisson's Ratio

0.34

Rockwell B Hardness

77

Shear Modulus

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

Shear Strength

380 *MPa* 55 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

570 *MPa* 83 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

290 *MPa* 41 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

250 *J/g*

Maximum Temperature: Mechanical

210 *°C* 410 *°F*

Melting Completion (Liquidus)

1040 *°C* 1910 *°F*

Melting Onset (Solidus)

990 *°C* 1810 *°F*

Specific Heat Capacity

430 *J/kg-K* 0.1 *BTU/lb-°F*

Thermal Conductivity

48 *W/m-K* 28 *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

29 *% relative*

Density

8.4 *g/cm ^{3}* 520

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

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

Embodied Water

360 *L/kg* 43 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

170 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

360 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.4 *points*

Stiffness to Weight: Bending

19 *points*

Strength to Weight: Axial

19 *points*

Strength to Weight: Bending

18 *points*

Thermal Diffusivity

13 *mm ^{2}/s*

Thermal Shock Resistance

21 *points*

## Alloy Composition

Among wrought copper alloys, the composition of C64210 bronze is notable for including arsenic (As) and aluminum (Al). Arsenic is used to protect the alloy against dezincification. Aluminum is used to add strength and oxidation resistance.

Cu | 89 to 92.2 | |

Al | 6.3 to 7.0 | |

Si | 1.5 to 2.0 | |

Zn | 0 to 0.5 | |

Fe | 0 to 0.3 | |

Ni | 0 to 0.25 | |

Sn | 0 to 0.2 | |

As | 0 to 0.15 | |

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

## Similar Alloys

## Further Reading

ASTM B124: Standard Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes

ASTM B283: Standard Specification for Copper and Copper-Alloy Die Forgings (Hot-Pressed)

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