Iron and steel, all being unwrought or semi-wrought; steel in sheet, pipe, tube, plate, bar, billet, bloom, slab and rail form; steel pipes and tubes for pipelines; building and construction materials of metal, namely, metal door frames, steel frames for building, metal window frames, metal greenhouse frames, metal ceiling panels, metal roofing panels, wall panels of metal, metal door panels and metal fence panels; prefabricated buildings made substantially of metal; containers of metal for t...