All metals react with oxygen in the atmosphere to form an oxide film on their surfaces. Unfortunately, the iron oxide formed on ordinary carbon steel continues to oxidize, causing the rust to expand continuously and eventually form holes. The surface of carbon steel can be protected by using paint or electroplating with oxidation-resistant metals such as zinc, nickel and chromium. However, as is known to all, this protection is only a film. If the protective layer is damaged, the steel beneath will begin to rust.

　　The corrosion resistance of stainless steel depends on chromium. However, since chromium is one of the components of steel, the protection methods are not the same.

　　The addition amount of chromium reaches10.5％At this time, the atmospheric corrosion resistance of steel significantly increases. However, when the chromium content is higher, although the corrosion resistance can still be improved, it is not obvious. The reason is that when chromium is alloyed with steel, the type of surface oxide is changed to be similar to the surface oxide formed on pure chromium metal. This tightly adhered chromium-rich oxide protects the surface from further oxidation. This oxide layer is extremely thin. Through it, the natural luster of the steel surface can be seen, giving stainless steel a unique surface. Moreover, if the surface layer is damaged, the exposed steel surface will react with the atmosphere to self-repair and re-form this"Passivation film"Continue to play a protective role.

　　Therefore, all stainless steels share a common characteristic, that is, the chromium content is all at10.5％That's all.

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