The role of chromium in stainless steel

No matter what grades of stainless steel it is, there must contain a certain amount of chromium. So far, there is no chrome stainless steel. Chromium is to determine the main elements of the performance of stainless steel, the main reason is that the steel to add more than 12% chromium as alloying elements, the steel surface will form a very thin colorless, transparent and very smooth surface, a layer of chromium oxide film automatically (i.e. passivation film), the formation of this membrane greatly slow the reduction of oxidized steel.
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