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Super duplex stainless steel(SDSS) refers to the duplex stainless steel with prEN > 40, 25% Cr and high molybdenum (> 3.5%) and high nitrogen (0.22% ~ 0.30%). The main brands are UNS S32550 (ur52n +), S32750 (SAF 2507) and S32760 (zeron 100). They were developed by cli in France, Sandvik in Sweden and mater + Platt in England. The composition of these three steels is similar.
Duplex stainless steel properties were analyzed from various tests.
Duplex stainless steel is a kind of stainless steel composed of ferrite and austenite, This alloy applications in various industries is introduced
Adding micro-alloy elements Ti, Nb, and V in a CA6NM martensitic stainless steel tube is usually expected to form a nitrogen compound with C and N.
Si is a strong ferrite stabilizing element in martensitic stainless steel. Si in CA6NM stainless steel can suppress temper embrittlement and the decomposition of retained austenite during tempering.
First of all, as a deoxidizer, we often add Al in CA6NM stainless steel. At the same time, Al is also a ferrite forming element. As a result, its promoting effect on ferrite formation is about 2.5~3 times of that of Cr.