6 Common metals and their alloys; unwrought or semi-wrought copper, copper alloys, nickel and nickel alloys, copper; light alloys; aluminum and titanium; steels; stainless steels; duplex alloys; duplex super alloys; parts of metal for building; tubes of metal; bars of metal; laminated metal strips; round wires of metal; metal profiles; hollow blanks of metal; panels of metal.