6 Common metals and their alloys; steel, especially quality steel and stainless steel, tool steel, high speed steels, free cutting steel, special steels, cold headed steels; bimetals, namely, sheets of a high speed alloy bonded to a sheet of backing steel; steels manufactured by means of powder metallurgy; nickel and alloys thereof; cobalt alloys, titanium and titanium alloys, aluminium and aluminium alloys, special stainless steels; all the aforesaid goods in all semi-finished forms in particular sheets, round bars, rectangular bars, hexagonal bars, pipes, profiles, bands, wires, weld fillers, the aforesaid goods in particular being rolled, forged, pressed, drawn, cut; steel; steel in bar form, in particular for hydrogen applications; steel goods, namely, chains, pipes, rails, round bars, rectangular bars, hexagonal bars, profiles, wire, in particular for hydrogen applications