Electrical steel sheets; silicon steel sheets; electrical steel sheets for iron core; iron and steel, all being unwrought or semi-wrought; nonferrous metals and their alloys; 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; liquid storage tanks of metal; industrial water storage tanks of met...