6 structural steel, stainless steel, tool steel and aluminum for use in construction, namely, sheets, plates, angles, bars, channels, I-beams, and tubes; metal materials for use in metals service center operations, namely, metal coils, sheets, plates, and I-beams; materials of metal for railway and railway bridge construction; steel in form of sheets, plates, rods, bars, foils and coils; unwrought steel; nuclear grade steel construction materials, namely, supports, cladding, brackets and refractory construction materials