In the surface treatment process of steel materials, an impeller rotating at high speed is used to throw steel shots, steel grit, or iron shots and hit the surface of the part at high speed to remove the oxide layer on the surface of the part. At the same time, steel shot or iron shot hit the surface of the part at high speed, causing the distortion of the crystal lattice on the surface of the part and increasing the surface hardness. Shot blasting is a method of surface strengthening the surface of parts, in addition, it has the functions of finishing and deburring. Shot blasting is often used to clean the surface of castings or parts that require surface strengthening treatment. Shot blasting cannot be used for surface treatment of thin parts with small thickness.

The general shape of the steel shot steel grit is a few tossing heads up and down, left and right together, with high efficiency and little pollution.

Both steel shot and steel grit can play a role in cleaning and decontaminating the workpiece. The purpose is to prepare for the next process, that is, to ensure the roughness requirements of the next process, and some are to ensure the consistency of the surface. The work piece has strengthening effect, the steel grit is not obvious