S165M is a high strength low carbon martensitic/ austenitic stainless steel. It combines high strength, good fatigue resistance with good weldability, properties which are maintained after welding. S165M is designed for application in slightly corrosive environment. Two minimum tensile levels are often used; QT760 and QT900. QT900 is mostly used by the industry. Corrosion resistance is at the level of AISI 304L in most environments, however insensitive to intergranular corrosion.