Research and development of new material technology; Sales of mechanical equipment; Sales of special equipment; Sales of metal materials; Sales of building materials; Sales of metal products; Sales of non-ferrous metal alloys; Sales of steel reinforcement products for construction; Sales of metal structures; Sales of new metal functional materials; Sales of high-performance non-ferrous metals and alloy materials; Sales of metal chains and other metal products; Sales of metal wire ropes and their products; Sales of rubber products; Sales of mechanical parts and components; Sales of construction machinery; Sales of rail transit engineering machinery and components; Sales of valves and plugs; Sales of lightweight building materials; Sales of fasteners; Leasing of construction machinery and equipment; Import and export of goods; Technology import and export; Import and export agency; Sales of metal fittings for construction; Sales of non-metallic minerals and products; Sales of building decoration materials; Sales of building blocks; Sales of electrical equipment; Sales of communication equipment; Sales of office equipment; Sales of labor protection equipment; Wholesale of hardware products; Operation of wires and cables; Bearing sales; Electronic product sales; Retail of computer software, hardware, and auxiliary equipment. (Except for projects that require approval according to law, conduct business activities independently based on the business license in accordance with the law). The current operating status of the enterprise is in operation