Super duplex stainless steel refers to the duplex steel with PREN>40, containing 25%Cr and high molybdenum (>3.5%), high nitrogen (0.22%~0.30%), the main grades are UNS S32550 (UR52N+), S32750 (SAF 2507 ) and S32760 (Zeron 100) were developed by companies such as CLI in France, SANDVIK in Sweden
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