MATERIALS FOR CASTING
Different alloys

There is a wide variety of materials for casting, with different profiles of characteristics. The right alloying technique and the perfect surface treatment enhance the characteristics of cast materials, so that they are a precise match to the respective technical and economic requirements.

The term gunmetal is used to describe a cast material using a copper-zinc-tin alloy (CuZnSn). Gunmetal is used, for example, for hydraulic plants, slide bearings, toothed wheels and worm wheels.

http://en.wikipedia.org/wiki/Brass