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　　Generally, the corrosion of alloy steel shot occurs under extreme pH value, that is, in strong alkali, or in strong alkali, which is not very common. The typical medium is sulfuric acid, phosphoric acid, etc. the corrosion speed of Hongxin steel shot highly depends on the temperature and impurities, especially the presence of chloride. The corrosion increases with the increase of temperature and chloride ion concentration.

　　Alloy steel shot is a kind of corrosion caused by local damage of protective oxide layer. It will not be passivated again, but will be seriously corroded. Pitting is the edge of stainless steel, which will be passivated again. The risk of pitting corrosion and crevice corrosion increases with the increase of chloride content and temperature. The increase of Cr, Mo and N content of alloy elements and alloy steel shot is conducive to the corrosion resistance, while the effect of Ni is relatively small. Non-metallic impurities, such as s and P, will seriously reduce the corrosion resistance.

　　Corrosion penetration exists in the steel area with tensile stress, which is common. The risk of corrosion cracking of alloy steel shot increases with the increase of chloride content. The corrosion cracking is more temperature dependent than other types of corrosion. Compared with austenite alloy shot, the sensitivity of ferrite and dual phase steel to corrosion cracking is reduced.

　　Intergranular corrosion is caused by the formation of chromium carbide in the grain boundary of alloy steel shot. When the steel is heated to a temperature of 500-850 ℃, the carbon combines with useful chromium, resulting in the weakening of the area adjacent to the grain boundary. The sensitization is not caused by the use of the steel's own C, but by the use of oil. Subsequently, the heating process releases carbon, and the carbon diffuses into the steel. After that, Cr has been combined in the form of carbide, followed by acid With the carbon content of steel, the risk of intergranular corrosion increases rapidly.