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Steels that contain chromium (between 12% and 30%), nickel (up to 35%) e other alloys. These elements have two functions: making the steel shiny but, above all, protecting it from the attack of atmospheric agents, gases and corrosive acids. Chromium is particularly capable of passivation, i.e. oxidising to form an invisible layer that acts as a protective coating for the metal against external corrosion.