C28000 Muntz Metal, also known as 60/40, is copper alloyed with zinc. C280 Muntz is most commonly found in sheet and plate form. Cu Zn40 is considered a duplex alpha-plus-beta brass and has excellent hot-working properties but is less corrosion resistant than C464 Naval Brass. C28000 Muntz is commonly used in architectural applications, including decorative panels, elevators, trim work and signage. Compared to the yellow tones of C260 Cartridge Brass, C280 Muntz has a warmer appearance that readily takes to polishing. Industrial applications for 280 brass include baffles and tubesheets.
Specifications for C28000
| ASTM | |
| Sheet | ASTM B36 |
| Plate | ASTM B36 |
Mechanical Properties for for C28000
| TEMPER | Designation | Tensile, min ksi (MPa) | Tensile, max ksi (MPa) |
| M20 | As Hot-Rolled | 40 (275) | 55 (380) |
| H01 | Quarter-Hard | 50 (345) | 62 (425) |
| H02 | Half-Hard | 58 (400) | 70 (485) |
| H03 | Three Quarter-Hard | 60 (415) | 75 (515) |
| H04 | Hard | 70 (485) | 85 (585) |
| H06 | Extra Hard | 82 (565) | 95 (655) |
Compositions for C28000 Muntz Metal
| UNS No. | Copper + Silver | Lead | Iron | Zinc |
| C28000 | 59.0-63.0 | 0.09 max | 0.07 max | remainder |
Physical Properties for C28000 Muntz Metal
| Density @ 68o F | 0.305 lb/in3 |
| Melting Range | 1645-1650o F |
| Hot Formability | Excellent |
| Cold Formability | Limited |
| Machinability rating (C360 = 100) | 45 |
| Brazing | Good |
| Soldering | Excellent |
| Gas-shielded arc welding | Fair |
| Oxy-acetylene welding | Good |
| Carbon-arc welding | Not recommended |
| Coated metal-arc welding | Not recommended |
| Resistant welding: spot and seam | Fair |
| Resistance Welding: butt | Good |
Applications for C28000 Muntz Metal
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* Heat Exchangers
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| * Baffles |
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* Fasteners
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* Tubesheets
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* Condensers
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* Elevator Doors
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* Decorative Facia
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| * Signage |
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* Architectural Trimwork
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