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Anti-oxidation effect of heat-resistant and wear-resistant steel
Aug 31, 2018

The oxidation resistance of heat-resistant and wear-resistant steel is the oxidation corrosion stability of gas medium at high temperature. It is an important condition to ensure that the workpiece can work long-term at high temperature. The basic method to improve the high temperature oxidation resistance of steel nowadays is alloying, adding enough chromium, nickel, silicon, manganese and other alloy elements in the steel, so that the steel can form a stable and compact Cr2O2/SiO2 and Al2O3 oxide film on the high temperature oxidation surface. These oxide films can be firmly attached to the metal surface, thus effectively protecting the metal from oxidation of high-temperature gases and corrosion of the medium. Chromium is the main element to improve the high temperature oxidation resistance of steel. The higher the working temperature, the higher the chromium content in steel should be. With the increase of chromium content in steel, the stability of chromium oxide film increases, and the thickness and density of film increase. The test shows that the workpiece should contain 5% Cr at 600-659 C, 800 C, 12% Cr, 950 C, 20% Cr, 1100 C and 28% Cr. In order to further increase the oxidation resistance of the material, a certain amount of nickel and nitrogen were added to the material and rare earth was used to improve the diffusion ability of chromium atoms and austenite structure, and then the heat resistance and heat strength of the alloy steel were improved.


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