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　　The shape of the steel sand is irregular, which is formed by crushing the steel shot. It is mainly produced by crushing the forged bearing steel after direct quenching. It is mainly used for cleaning the surface of casting or strengthening the surface of parts.

　　The steel shot is round, regular and uniform. It is refined by wire drawing, cutting, strengthening and other processes. The particle size of the product is uniform, ranging from 0.2mm-2.0mm, and the hardness and density are highly unified. The main purpose is to use the high-speed rotating impeller to throw the steel shot or steel sand out and hit the part surface at high speed, so the oxide layer on the part surface can be removed. When the steel shot or iron shot hit the surface of the part at high speed, it will cause the distortion of the lattice on the surface of the part, which can improve the surface hardness of the metal. This is a method of cleaning the surface of the part.