# UNS C36500 (CW610N) Leaded Muntz Metal

C36500 Muntz Metal is a brass formulated for primary forming into wrought products. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CW610N is the EN numeric designation for this material. C36500 is the UNS number. Additionally, the EN chemical designation is CuZn39Pb0,5. And the British Standard (BS) designation is CZ137.

It has a moderately low tensile strength among the wrought brasses in the database.

The graph bars on the material properties cards below compare C36500 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

40 *%*

Poisson's Ratio

0.3

Rockwell B Hardness

45

Shear Modulus

39 *GPa* 5.7 *x 10 ^{6} psi*

Shear Strength

270 *MPa* 40 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

400 *MPa* 58 *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* 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

120 *W/m-K* 71 *BTU/h-ft-°F*

Thermal Expansion

21 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

28 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

32 *% 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* 39 *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

7.2 *points*

Stiffness to Weight: Bending

20 *points*

Strength to Weight: Axial

14 *points*

Strength to Weight: Bending

15 *points*

Thermal Diffusivity

40 *mm ^{2}/s*

Thermal Shock Resistance

13 *points*

## Alloy Composition

Among wrought copper alloys, the composition of C36500 Muntz Metal is notable for including tin (Sn). Tin is used to improve strength, bearing properties, and corrosion resistance against certain types of media.

Cu | 58 to 61 | |

Zn | 37.5 to 41.8 | |

Pb | 0.25 to 0.7 | |

Sn | 0 to 0.25 | |

Fe | 0 to 0.15 | |

res. | 0 to 0.4 |

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