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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 106 psi

Elongation at Break

40 %

Poisson's Ratio

0.3

Rockwell B Hardness

45

Shear Modulus

39 GPa 5.7 x 106 psi

Shear Strength

270 MPa 40 x 103 psi

Tensile Strength: Ultimate (UTS)

400 MPa 58 x 103 psi

Tensile Strength: Yield (Proof)

160 MPa 23 x 103 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/cm3 500 lb/ft3

Embodied Carbon

2.7 kg CO2/kg material

Embodied Energy

46 MJ/kg 20 x 103 BTU/lb

Embodied Water

320 L/kg 39 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

130 MJ/m3

Resilience: Unit (Modulus of Resilience)

120 kJ/m3

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 mm2/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.

Copper (Cu) 58 to 61
Zinc (Zn) 37.5 to 41.8
Lead (Pb) 0.25 to 0.7
Tin (Sn) 0 to 0.25
Iron (Fe) 0 to 0.15
Residuals 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