CuZn40 (Muntz Metal) is a brass alloy with 40% of zinc. It has a two phased structure of alpha- and beta- phase. The alloy is mainly used for decorative purposes due to the deep bronzed color. The alloy has limited cold formability, yet it has a good hot formability. Due to the high zinc content the alloy is economically interesting. Fields of application are Architecture and decorative applications.
Cu.59.5-61.5
Zi.rem.
The electrical conductivity depends on chemical composition, the level of cold deformation and the grain size. A high level of deformation as well as a small grain size decrease the conductivity.
Brass is resistant to: Natural, industrial and salt bearing atmospheres, drinking water, alkaline and neutral saline solutions. Brass is not resistant to: Acids, ammonia, halogenide, cyanide and hydrogen sulfide solutions and atmospheres as well as sea water (especially at high flow rates). Under certain circumstances (high Cl content and low carbon-hardness) dezincification can be an issue with CuZn40. The alloy also has a certain sensitivity to stress corrosion cracking when exposed to certain environments (e.g. ammonia, amine or sal ammoniac). The alloy should be stress relieved if stress corrosion cracking might be an issue.
Usage
Architectural panels, large architectural trim, sheet, structural, heavy plate, door frames, decoration, hardware
