It is used to remove the sticky sand and oxide scale on the surface of cast steel and cast iron in the foundry industry. Almost all steel castings, gray castings, malleable iron parts, ductile iron parts, etc. must be shot blasted. This is not only to remove the oxide scale and sticky sand on the surface of the casting, but also an indispensable preparation process before the quality inspection of the casting. For example, the casing of a large gas turbine must be subjected to strict shot blasting before non-destructive inspection to ensure the inspection results. reliability. In the production of general castings, shot blasting is an indispensable process for discovering casting surface defects such as subcutaneous pores, slag holes, sand sticking, cold insulation, and peeling. The surface cleaning of non-ferrous metal castings, such as aluminum alloys, copper alloys, etc., in addition to removing oxide scales and discovering surface defects of the castings, the main purpose is to remove burrs from die castings and obtain decorative surface quality. , To obtain a comprehensive effect. In metallurgical iron and steel production, shot blasting and pickling is a process method to ensure high productivity in the mass production of iron and steel, which is a process method of mechanical-chemical combined removal of phosphorus. In the production of silicon steel sheets, stainless steel sheets and other alloy steel sheets and strips, annealing, shot blasting and pickling must be performed during the cold rolling process to ensure the surface roughness and thickness accuracy of the cold rolled steel sheets.