Steel shot is manufactured from scrap steel through a well-controlled casting process. Various additives are added to ensure a consistent quality product. It is used for preparing surfaces, cleaning the toughest forging, etching mill rolls, brightening finishes, shot peening aircraft parts to increase fatigue strength, reduce wear and friction and to relieve stress and special surface finishes. The round ball shape of the steel shot produces a clean, smooth and polished surface through a peening action created by the acceleration of the shot. In a peening application, steel shot is also used to impart compressive strength to torque or load bearing metal parts such as crankshafts, engine turbine blades and heavy-duty springs.
Smaller steel shot will result in a smoother and more polished surface. Larger shot will clean more aggressively but produce a rougher surface. Both air powered and wheel blast systems can be used to accelerate the steel shot onto the surface of the part. Due to the hardness and density of steel shot, it can be recycled as much as 3000 times before replacement. Since steel shot does not use an abrasive process, a minimal amount of dust is created in the blasting process.