, Volume 37, Issue 6, pp 597-601

On Limit of Molybdenum Content of Pitting-Corrosion-Resistant Austenitic Steels

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The role of molybdenum in the pitting resistance of iron–chromium–nickel–molybdenum experimental alloys and their welds is investigated. The accelerated tests are performed in a 5% solution of FeCl3. It is shown that alloying with molybdenum enhances the pitting resistance of an alloy only until of molybdenum the solubility limit of molybdenum in the matrix is reached; the limit in turn grows with the Ni content. Thus, to enhance the pitting resistance of an alloy corrosion, one should hold a balanced proportion between the contents of Mo and Ni in the alloy.