Copper-based alloys and particularly bronzes and gunmetals have been used for over a thousand years because of their corrosion resistance and their good combination of castability, machinability and strength. They are used for cold and hot vapour armatures, acid armatures, pumps and valves, and also for bearings where loads and speeds are moderate. In order to get high quality castings, it is very important to pay particular attention to the different steps of the process and particularly to metal treatment, feeding and filtration. In addition, simulation of the castings is strongly recommended in order to obtain optimum filling and solidification and therefore improved quality.
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