№822

For more than five thousand years craftsmen have seen making metal castings for either artistic or utilitarian purposes. Castings are made in innumerable alloys, but for commercial purposes they can be considered as falling into the following groups: iron (including ordinary grey iron, white iron, blackheart and whiteheart malleable) and special-purposes grey iron (including spheroidal-graphite and all types of alloyed iron), steel (both plain carbon and alloyed);copper-base non-ferrous metals (brass, bronze, gunmetal, etc.); light alloys (aluminium and magnesium) and miscellaneous groups such as zinc-base die-casting alloys and white metals.