Common metals, unwrought or semi-wrought, and their alloys, namely, carbon alloys, stainless steels, through-hardening, free-cutting steels, case-hardening steels, bearing steels, spring steels, surface hardening steels, micro-alloyed steels, nitriding steels, steels with improved machinability, tool steels, high chrome steels, steels for heat treatment; steel, steel alloys, steel wires, cast steel, [ steel sheets, steel tubes, ] steel bars [ and pipes ] of steel, carbon steel, alloyed steels...