This is due to the inclusion of a certain amount of chrome alloy in this type of steel, so that the surface of the steel surface can not form a layer of insoluble oxide film (passivation film), so that the metal and external media isolation without chemical effect. In this type of steel, some in addition to containing more chromium (Cr), but also match the addition of more other alloying elements, such as nickel (Ni), so that in the air, water, steam has a very good chemistry Stability, but also in many kinds of acid, alkali, salt aqueous solution also has sufficient stability, even in high temperature or low temperature environment, can still maintain its advantages of corrosion resistance.
