In the production process of seamless steel pipe, pickling and passivation process is one of the key links. It can not only improve the surface quality of steel pipe, but also enhance the corrosion resistance of steel pipe and extend its service life. As an important material in industrial production, precision seamless steel pipe is widely used in petroleum, chemical, boiler, power station, machinery and other industries due to its high precision, high strength and good corrosion resistance. In these fields, the surface quality of seamless steel pipe directly affects its subsequent service life and performance. Therefore, it is particularly important to pickle and passivate the surface of steel pipe during the production process.