Martensitic stainless steel
have a ferritic structure in annealed condition, and a martensitic structure in quenched and tempered condition. Compared to conventional martensitic steel grades, they have improved corrosion resistance. These steels contain between 12 and 15 % of chromium and between 0.1 and 0.5 % of carbon. By adding molybdenum their corrosion and wear resistance is increased. Steels containing between 0.1 and 0.25 % of carbon are mostly used in constructions which require corrosion resistance and enhanced mechanical properties. Steel grades with 0.3 % of carbon or more are used for cutting tools due to their high hardness and wear resistance.