When you add the amount of chromium reached 10.5% , atmospheric corrosion qiyi magnetic stainless steel sheet increased significantly, but higher chromium content , although still improve corrosion resistance , but not obvious. The reason is that when the steel with a chromium alloying treatment , the type of change has become similar to the surface oxide formed on the surface of pure chromium oxide of the metal . Chromium-rich oxide protects the surface of this tightly adherent to prevent further oxidation. This oxide layer is very thin , it can be seen through the surface of the natural sheen of steel , so stainless steel has a unique surface. Moreover, if the damaged surface , and atmospheric reactions exposed steel surface will 304 stainless steel sheet re- formation of this " passive film " , continue to play a protective role. Therefore, all of the stainless steel have a common characteristic , i.e., the chromium content of more than 10.5% .
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