Most of Cr Ni austenitic stainless steels are in metastable state at room temperature, but martensitic transformation occurs in ultra-low temperature range due to lattice distortion. The temperature at which martensite begins to transform is the martensite transformation point (also known as transformation point), which is represented by the symbol Ms. The temperature of MS… Read more Cryogenic treatment – Cryogenic Treatment of austenitic stainless steel for cryogenic valves