Q38, Q48, Q58 series catenary stepping shot blasting machine are used to remove castings, forgings, structural parts such as the workpiece surface sand, scale, rust and so on. The surface of the workpiece appears metallic luster, and castings surface defects exposed to eliminate the stress within the workpiece, the surface roughness to Ra12.5 requirements GB6060.5 requirements, in line with national JB/ T8355-96 Sa2.5 level.