Containing more than 18% chromium, it also contains about 8% nickel and a small amount of elements such as molybdenum, titanium and nitrogen. Good overall performance, resistant to a variety of media corrosion. Commonly used grades for austenitic stainless steels are 1Cr18Ni9, 0Cr19Ni9, and the like. 0Cr19Ni9 steel has a Wc < 0.08% and a steel number marked "0". This type of steel contains a large amount of Ni and Cr, making the steel austenitic at room temperature. This type of steel has good plasticity, toughness, weldability, corrosion resistance and non-magnetic or weak magnetic properties. 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. Lining, conveying pipes, equipment parts resistant to nitric acid, etc., can also be used as the main material of stainless steel watches and clocks. Austenitic stainless steels are generally treated by solution treatment, that is, the steel is heated to 1050 to 1150 ° C, and then water-cooled or air-cooled to obtain a single-phase austenite structure.