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.
| 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