Manufacturing, sales, installation, and repair of metallurgical special equipment, metallurgical special railway vehicles, coking equipment, smelting valves, general valves, mechanical equipment, castings, metal structural parts, electrical switch cabinets, and complete electrical equipment; furnace services; manufacturing of burners and supporting equipment (excluding pressure vessels); manufacturing of environmental protection equipment, engineering design, construction, and project contracting; manufacturing of energy-saving equipment, engineering design, construction, and project contracting; sales of lifting machinery; design, manufacturing, sales, installation, commissioning, and operation services for port machinery; import and export of goods and technology; metallurgical engineering design (excluding coking and refractory materials engineering); metallurgical engineering technical consulting and services (excluding coking and refractory materials engineering); metallurgical engineering contracting (excluding coking and refractory materials engineering); contracting of foreign engineering projects and dispatching of labor personnel required for implementing such projects; leasing of plant and equipment; leasing of buildings; production and sales of desulfurizers.