Austenitic stainless steel: containing more than 18% chromium, also contains about 8% of nickel and a small amount of molybdenum, titanium, nitrogen and other elements. Good overall performance, resistant to a variety of media corrosion. Commonly used grades of austenitic stainless steels are 1Cr18Ni9, 0Cr19Ni9 and the like. 0Cr19Ni9 steel has wC<0.08%, and the steel number is marked as “0”. This type of steel contains a large amount of Ni and Cr, which makes the steel austenitic at room temperature. This type of steel has good plasticity, toughness, weldability and corrosion resistance. It has good corrosion resistance in both oxidizing and reducing media. It is used to make acid-resistant equipment, such as corrosion resistant containers and equipment linings, conveying pipes, and resistant. Nitric acid equipment parts, etc. Austenitic stainless steels are generally treated by solution treatment, that is, the steel is heated to 1050 to 1150 ° C and then water-cooled to obtain a single-phase austenite structure.