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According to the structural characteristics of steel, it can be divided into five types: austenite ferrite, ferrite, martensite and precipitation hardening. It is required to withstand the corrosion of oxalic acid, ferric sulfate, nitric acid, nitric acid hydrofluoric acid, copper sulfate, phosphoric acid, formic acid, acetic acid and other acids. It is widely used in chemical industry, food, medicine, paper making, petroleum, atomic energy and other industries, as well as various parts of buildings, kitchenware, tableware, vehicles and household appliances. In order to ensure that the yield strength, tensile strength, elongation, hardness and other mechanical properties of various stainless steel plates meet the requirements, the steel plates must be subject to annealing, solution treatment, aging treatment and other heat treatments before delivery. The corrosion resistance of stainless steel mainly depends on its alloy composition (chromium, nickel, titanium, silicon, aluminum, etc.) and internal structure. Chromium plays a major role. Chromium has high chemical stability, can form a passivation film on the steel surface, isolate the metal from the outside, protect the steel plate from oxidation, and improve the corrosion resistance of the steel plate. After the passivation film is damaged, the corrosion resistance decreases.