In recent years, the development of duplex stainless steel has been rapid, since 1990, the world annual production of duplex stainless steel from 24,000 tons in 1990 to 110,000 tons in 1999, its annual growth rate of about 17%. Molybdenum-containing duplex stainless steel has good corrosion resistance and weldability, it is suitable for nitride and hydrogen sulphide media and heat exchangers, but also for storage and transport of dilute sulphuric acid solutions and pure organic acids and other corrosive media. Due to the superior performance of duplex stainless steel, Europe, the United States, Japan and other countries are actively promoting the use of duplex stainless steel production and application in China also has a very broad prospects.
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