Steel oxidation resistance at high temperature or high temperature medium corrosion resistance. In unit time and per unit area after the oxidation weight increase or decrease the number representation. Steel at high temperature and oxygen react, if can form a layer of dense at the surface, and can be firmly combined with the metal surface oxidation film, the steel will no longer be oxidation. Carbon steel can not meet this requirement in general. There are three kinds of iron and oxygen can oxide. But the structure of the oxide film is related to temperature. Under 560 ℃, the oxide is made up of Fe2O3 and Fe3O4. This compact oxide, lattice structure is complex, lattice constant is small, iron ion diffusion through their hard, to prevent further oxidation. When the temperature exceeds 560 ℃, Fe2O3 and Fe3O4 form FeO layer below. Lattice structure is simple, lack of solid solution, there is gap in lattice, iron ion diffusion through the FeO layer, thus adding iron oxide.
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