Super austenitic stainless steel generally has higher alloying elements such as Cr, Mo, and N. Compared with 18-8 type conventional austenitic stainless steel, it has better corrosion resistance, good activation-passivation ability, and corrosion resistance. Excellent performance, good corrosion resistance in sulfuric acid, acetic acid, formic acid, phosphoric acid, good pitting corrosion resistance in neutral chloride ion-containing environment, and good crevice corrosion resistance and stress corrosion resistance In some cases, its corrosion resistance is comparable to that of nickel-based corrosion-resistant alloys. It is mainly used in chemical industry, alkali production, papermaking, seawater treatment, oil refining, coking and other industrial fields.