6 Common metals and their alloys; iron; unwrought or semi-wrought steel; cast iron, unprocessed or semi-processed; iron scrap; iron, unprocessed or semi-processed; ores of metal, including crude or processed ores; building materials of metal; materials of metal for railway tracks, including rails and component parts thereof; non-electric metal wires and cables, including metal welding wires and barbed wire; metal tubes and pipes (building materials); gratings of metal and wire netting, fences of metal, furnished or not with wire mesh and nets (construction materials); springs; hardware of metal; plates and cold-rolled strips of metal, sandwich foils and multi-layered metal products not included in other classes; frames, of metal; metal tanks and metal containers; packaging means of common metal and tinplate; metal goods of iron and steel, namely billets, lastro wall plug, plates, sheets of metal, plates, rings, hoops, spools, profiled battens, billets, beams, beams, bands, tube rods, wires and cables, billets, balls, casting and forging of ingots; goods of metal, namely forged, molded, cast, stamped, drawn, welded or machined metal pieces for use in the manufacture of boilers.