6 Steel in sheet, rod, bar and/or billet form; metal building materials, namely, beams, girders and pillars; metal pipes, metal plates, metal strips, wire, cable wire, and tubes; brazing alloys; casting molds and foundry chill-molds; cladding and roofing of metal for construction and building; metal lintels; metal rails and sleepers for railroads; metal reinforcements for use in construction and building; reinforcing bars of metal for concrete; sheet metal piling; metal hardware, namely, springs; and metal cans, sold empty