Iron and steel rolling mills

This Sub-class includes one of the following operations: •reduction of iron ore in blast furnaces and oxygen converters •reduction of ferrous waste and scrap in electric arc furnaces •by direct reduction of iron ore without fusion to obtain crude steel. The crude steel is smelted and refined in a ladle furnace, and then poured and solidified in a continuous caster in order to produce semi-finished flat or long products. These products are used, after reheating, in rolling, drawing and extruding operations to manufacture finished products such as plate, sheet, strip, bars, rods, wire, tubes, pipes and hollow profiles. Units in this Sub-class includes the manufacture of: •hot-rolled and/or cold-rolled flat-rolled products of steel •hot-rolled bars and/or rods of steel •hot-rolled open sections of steel •steel bars and/or solid sections of steel by cold drawing, grinding or turning •open sections by progressive cold forming on a roll mill or folding on a press of flat-rolled products of steel •wire of steel by cold drawing or stretching •sheet piling of steel and/or welded open sections of steel •railway track materials (unassembled rails) of steel •seamless tubes, pipes and/or hollow profiles of steel, by hot rolling, hot extrusion or hot drawing, or by cold drawing or cold rolling •welded tubes and/or pipes of steel, by cold or hot forming and/or welding, delivered as welded or further processed by cold drawing or cold rolling or manufactured by hot forming, welding and reducing •tube fittings of steel, such as: flat flanges and/or flanges with forged collars, butt-welded fittings, threaded fittings, socket-welded fittings •operation of blast furnaces, steel converters, rolling and/or finishing mills •re-melting of scrap ingots of iron or steel •pig iron and/or spiegeleisen in pigs, blocks or other primary forms