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%.
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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.
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