# UNS C28500 Muntz Metal

C28500 Muntz Metal is a brass formulated for primary forming into wrought products. Cited properties are appropriate for the H80 (hard drawn) temper. It has a moderately low base cost and a moderately high tensile strength among wrought brasses.

The graph bars on the material properties cards below compare C28500 Muntz Metal to: wrought 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

Elastic (Young's, Tensile) Modulus

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

Elongation at Break

20 *%*

Poisson's Ratio

0.3

Rockwell B Hardness

150

Shear Modulus

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

Shear Strength

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

Tensile Strength: Ultimate (UTS)

520 *MPa* 75 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

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

## Thermal Properties

Latent Heat of Fusion

170 *J/g*

Maximum Temperature: Mechanical

110 *°C* 240 *°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

100 *W/m-K* 58 *BTU/h-ft-°F*

Thermal Expansion

21 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

29 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

33 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

22 *% relative*

Density

7.9 *g/cm ^{3}* 490

*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)

94 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

700 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.3 *points*

Stiffness to Weight: Bending

20 *points*

Strength to Weight: Axial

18 *points*

Strength to Weight: Bending

18 *points*

Thermal Diffusivity

33 *mm ^{2}/s*

Thermal Shock Resistance

17 *points*

## Alloy Composition

Among wrought copper alloys, the composition of C28500 Muntz Metal is notable for containing comparatively high amounts of iron (Fe) and lead (Pb). Iron is used to increase strength inexpensively. Lead is used to improve machinability and bearing properties, at the cost of toxicity.

Cu | 57 to 59 | |

Zn | 39.5 to 43 | |

Fe | 0 to 0.35 | |

Pb | 0 to 0.25 | |

res. | 0 to 0.9 |

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

## Followup Questions

## Similar Alloys

## Further Reading

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993