Steel rolling processing; Steel and iron smelting; Sales of high-quality special steel materials; Road freight transport for ordinary vehicles with a total mass of 4.5 tons or less (excluding online freight and dangerous goods); Recycling of productive scrap metal; Leasing of mechanical equipment; Processing of renewable resources; Sales of renewable resources; Import and export of goods; Catering management; Repair of electrical equipment; Operation of Category III non-pharmaceutical precursor chemicals; Technical services, technology development, technical consultation, technical exchange, technology transfer, technology promotion; Research and development of new materials; Engineering and technological research and experimental development. Licensed items: Operation of hazardous chemicals; Electrical installation services; Inspection and testing services.