Duplex stainless steel pipes are widely used in many industrial fields such as petroleum, chemical industry, marine engineering, food processing and papermaking. In the petroleum and chemical industries, it is often used to manufacture equipment such as storage tanks, pipelines, heat exchangers and reactors, which can withstand high pressure, high temperature and corrosive media. In marine engineering, duplex stainless steel pipes are used in the structural support and transportation systems of offshore platforms to resist corrosion from seawater and marine organisms. In addition, it is suitable for conveying systems and storage equipment in the food processing and paper industries to ensure product hygiene and safety.