Special stainless steel X30CrMoN15-1 (SV30) is the best bearing ring material for aerospace, medical and spindle applications, its mechanical properties are stronger than any existing bearing material, its corrosion and temperature resistances are excellent, up to 450℃. Martensitic stainless steel is gotten from raw steel by reducing the carbon content and introducing nitrogen as an agent over the alloying process. Nitrogen increases the saturation of chromium, which is converted to chromium nitride instead of chromium carbide, resulting in a high-strength, high-hardness steel with excellent microstructure that can extend the fatigue life by 100% (twice) in some applications. This material also offers enhanced corrosion resistance, better than 440C and ACD34 (5 times higher).