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Super duplex stainless steel refers to those duplex steel with PREN >40 ( PREN is abbreviated from [Pitting Resistance Equivalent Number", a measurement of the corrosion resistance of stainless steel containing nickel), Cr 25%, (high) molybdenum >3.5%, and (high) nitrogen ranging 0.22%~0.30%.
Super duplex features higher corrosion resistance and better mechanical properties than duplex stainless steel 2205 (S31803). The main grades/types are UNS S32550 (UR52N+), S32750 (SAF 2507) and S32760 (Zeron 100), developed by CLI from French, SANDVIK from Swedish and MATER+PLATT from UK respectively. The deformed materials of these super duplex were invented in 1990 and 1991 sequentially, and launched into market in recent years. The chemical compositions of these three steels are quite similar; the main difference lies in the content of tungsten and copper.
· 1) Offshore oil platform (heat exchanger tubes, water treatment and water supply systems, fire protection systems, water spray systems, water stabilization systems)
· 2) Special chemical environmental equipment such as desalting (desalination) equipment (high pressure pipe in Ro equipment, seawater pipe)
· 3) Oil and gas industry equipment
· 4) Chemical processing industry, utensils and pipeline industry
· 5) Desalting plants, submarine pipelines
· 6) Mechanical components (high-strength and corrosion-resistant components), energy industry FGD systems, industrial scrubbing systems and absorption towers
· 7) Others.
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