# UNS C85500 Yellow Brass

C85500 brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a fairly low base cost among cast brasses. In addition, it has the highest ductility and a moderately high thermal conductivity.

The graph bars on the material properties cards below compare C85500 brass to: cast brasses (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

Brinell Hardness

85

Elastic (Young's, Tensile) Modulus

100 *GPa* 15 *x 10 ^{6} psi*

Elongation at Break

40 *%*

Poisson's Ratio

0.31

Rockwell B Hardness

55

Shear Modulus

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

Tensile Strength: Ultimate (UTS)

410 *MPa* 60 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

160 *MPa* 23 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

170 *J/g*

Maximum Temperature: Mechanical

120 *°C* 250 *°F*

Melting Completion (Liquidus)

900 *°C* 1650 *°F*

Melting Onset (Solidus)

890 *°C* 1630 *°F*

Specific Heat Capacity

390 *J/kg-K* 0.092 *BTU/lb-°F*

Thermal Conductivity

120 *W/m-K* 67 *BTU/h-ft-°F*

Thermal Expansion

21 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

26 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

29 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

23 *% relative*

Density

8.0 *g/cm ^{3}* 500

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

46 *MJ/kg* 20 *x 10 ^{3} BTU/lb*

Embodied Water

320 *L/kg* 38 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

130 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

120 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.3 *points*

Stiffness to Weight: Bending

20 *points*

Strength to Weight: Axial

14 *points*

Strength to Weight: Bending

15 *points*

Thermal Diffusivity

38 *mm ^{2}/s*

Thermal Shock Resistance

14 *points*

## Alloy Composition

Among cast copper alloys, the composition of C85500 brass is notable for including manganese (Mn). Manganese is used to improve strength without a proportional reduction in ductility.

Cu | 59 to 63 | |

Zn | 35.1 to 41 | |

Mn | 0 to 0.2 | |

Ni | 0 to 0.2 | |

Fe | 0 to 0.2 | |

Sn | 0 to 0.2 | |

Pb | 0 to 0.2 | |

res. | 0 to 0.9 |

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

## Followup Questions

## Similar Alloys

## Further Reading

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