Shot Peening and Shot Blasting 

Shot Peening and Shot Blasting in Heat Treatment

Shot peening and shot blasting are both widely used in heat‑treatment operations, but they serve distinct and different functions.

Shot peening is a controlled cold‑working process used to improve the mechanical performance of metal components. By bombarding the surface with spherical media, compressive residual stresses are introduced, which significantly enhance fatigue strength and extend service life. Shot peening is not a cleaning process; its primary purpose is to improve durability and resistance to cyclic loading. It is commonly applied in aerospace, automotive, and construction applications where fatigue performance is critical.

Shot blasting, by contrast, is a surface cleaning and preparation process. It uses abrasive media propelled at high velocity to remove scale, rust, paint, burrs or other surface contaminants and to produce a uniform surface texture. Shot blasting is typically performed before coating, painting, or further processing and is widely used in metal fabrication, infrastructure, and refurbishment applications.

Both processes play important roles in heat treatment operations. Shot blasting prepares surfaces for subsequent processing, while shot peening enhances fatigue resistance and overall component performance. The choice between them depends on the functional requirements of the part and applicable industry standards.