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This term relates to preferential oxidation of certain chemical constituents of the steel. In stainless steels - it is usually the phenomena of oxidizing the Cr (Chromium) much faster than other elements in the base material. It results in depletion of the steel in Cr which in turn results in relative increase in amounts of other elements. Selective oxidation may be one of the mechanisms of corrosion.

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Q: What is selective oxidation in stainless steel?
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