The manufacture of basic iron and steel products, consisting of all processes from smelting in blast furnaces to the semi-finished stage in rolling mills and foundries, that is, the production of billets, blooms, slabs or bars; re-rolling and drawing into basic forms such as sheets, plates, strips, tubes and pipes, rails, rods and wires; tin-plate; rough castings and forgings. Also included are coke ovens which are associated with blast furnaces.