Other metal products not specified. Manufacturing, processing, marketing: Pipe fittings, power station auxiliary machinery and supporting equipment, pipeline equipment, pressure vessels, boilers and accessories; Sales: Green building materials, valves, power plant accessories, machinery and equipment, wujinjiaodian, fire equipment, steel: Import and export of goods or technologies (except for the import and export of goods and technologies prohibited by the state or involving administrative approval). (For projects subject to approval according to law, business activities can only be carried out after approval by relevant departments; General business projects, may independently carry out business activities according to law) Other metal products not specified. Manufacturing, processing, marketing: Pipe fittings, power station auxiliary machinery and supporting equipment, pipeline equipment, pressure vessels, boilers and accessories; Sales: Green building materials, valves, power plant accessories, machinery and equipment, wujinjiaodian, fire equipment, steel: Import and export of goods or technologies (except for the import and export of goods and technologies prohibited by the state or involving administrative approval). (For projects subject to approval according to law, business activities can only be carried out after approval by relevant departments; General business projects, may independently carry out business activities according to law)