MakeItFrom.com
Menu (ESC)

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 106 psi

Elongation at Break

20 %

Poisson's Ratio

0.3

Rockwell B Hardness

150

Shear Modulus

40 GPa 5.8 x 106 psi

Shear Strength

320 MPa 47 x 103 psi

Tensile Strength: Ultimate (UTS)

520 MPa 75 x 103 psi

Tensile Strength: Yield (Proof)

380 MPa 55 x 103 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/cm3 490 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 38 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

94 MJ/m3

Resilience: Unit (Modulus of Resilience)

700 kJ/m3

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 mm2/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.

Copper (Cu) 57 to 59
Zinc (Zn) 39.5 to 43
Iron (Fe) 0 to 0.35
Lead (Pb) 0 to 0.25
Residuals 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