Stainless steel not only has strong chemical stability, but also sufficient strength and plasticity, and stable mechanical properties at certain high or low temperatures. Some grades of this type of steel can also be used as heat-resistant steel (including austenitic, ferritic, martensitic, and precipitation hardening types); Some can be used as high-quality low-temperature steel, and their corrosion resistance remains excellent during use. Due to the unique properties mentioned above, it is not difficult to imagine the position that stainless steel occupies in the national economy. Especially in today's high-tech development, stainless steel is widely used in various fields. It can be used as a material for acid resistant, alkali resistant, and high-pressure pressure vessel devices and storage and operation tanks in the chemical industry, oil refining industry, synthetic fiber industry, food, pharmaceutical, and daily necessities industry; It can also be used as high-temperature and low-temperature resistant components in the power industry, steam turbine manufacturing industry, shipbuilding industry, and aviation industry; In the aerospace and nuclear industries, it is an indispensable material for manufacturing artificial satellites, spacecraft, rockets, and nuclear power devices; With the increasing development of the national economy and the continuous improvement of people's living standards, stainless steel daily products have also penetrated into thousands of households.