Steel pipes; steel plates; steel structures, namely, steel frames for building, steel rods; steel wires; steel sheets; molten steel; galvanized steels; rolled steels; steel alloys; steel masts; steel for cementation; steel for rail; flat and non-flat steel; high speed steel for high-speed lathe; aluminum for construction, namely, aluminum sheets, ingots, siding; metal bars for brazing and soldering; non-electric steel cable; metal pipes; metal angles for use in building construction; aluminum...