The alloy CuZn37 is a brass, which has primarily a homogeneous alpha faces centered cubic single phase, solid solution of Zn in copper. Depending on the cooling conditions during the production process, some traces of the beta body centered cubic phase are possible. The alpha phase is very ductile at low temperatures and large cold deformation by rolling, deep drawing, bending, inside spinning, etc. are possible. On the other hand, the beta (or ordered beta') phase in brass reduces ductility, corrosion resistance, but improve drastically the hot workability and significantly the machinability. The machinability of CuZn37 is moderate; its machinability index is estimated at 35% of those of the free cutting brass, CuZn39Pb3. Amongst the Cu and Zn alloys, there are other brasses having lower amount of Zn, consequently a lower tensile strength and hardness but an improved cold deformability. Lamineries MATTHEY SA produces also the CuZn28, for example.

Typical uses
The CuZn28 is used in many different applications, like needles, wheels, dials, etc. for the watch industry, contact parts in relays, stamped-rolled connectors, chemical etched parts, deep drawing parts, etc.