Corrosion resistantce (rustproof) steel is type of steel, whose main requested characteristic is resistance against corrosion (rust). It´s alloy of chromium, nickel and iron, who has content 10,5 – 30% of chromium, up to 30% of nickel or up to 2,5% of manganese. Simultaneously content certainly quantity of other austenite-creative elements, e.g. carbon, molybden, molybdenum, nitrogen, copper.