Manufacturing of power transmission and distribution and control equipment; manufacturing of transformers, rectifiers, and inductors; steel rolling processing; repair of metal products; manufacturing of metal materials; wholesale of hardware products; sales of steel bars for construction; sales of high-quality special steel materials; sales of metal materials; sales of building materials; sales of lightweight building materials; technology import and export; goods import and export; sales of metal products; repair of special equipment; manufacturing of automobile parts and accessories; manufacturing of non-road leisure vehicles and parts; manufacturing of railway locomotive and rolling stock parts; manufacturing of special equipment (excluding licensed special equipment manufacturing); manufacturing of building metal accessories; production of bearing steel products; manufacturing of metal structures; processing of mechanical parts and components; sales of metal tools; sales of building metal accessories; metal cutting processing services; sales of non-metallic ores and products; sales of new metal functional materials; sales of high-performance non-ferrous metals and alloy materials; metal surface treatment and heat treatment processing; power generation, transmission, and distribution (supply) business; power generation, transmission, and supply business; production of steel bars for construction.