This sub-class includes the pouring of molten iron and/or steel into moulds of a desired shape to make castings, i.e., the activities of iron and/or steel foundries. Units in this sub-class include the manufacture of: •tubes, pipes and/or hollow profiles and/or of tube or pipe fittings of cast-iron •seamless tubes and/or pipes of steel by centrifugal casting •tube or pipe fittings of cast-steel •casting of: semi-finished iron products, grey iron castings, spheroidal graphite iron castings, malleable cast-iron products, semi-finished steel products, steel castings