The use of spray welding technology provides surface strengthening and functional coatings for laminar cooling rollers in steel mills' hot rolling lines, effectively extending the service life of the rollers and improving the stability of production line operation. This technology has been successfully applied in Ma Steel, Han Steel, Lian Steel, Xin Steel, Tang Steel and foreign steel mills

　　By using appropriate self melting alloy spray welding methods, functional protective coatings with high density, hardness, and bonding strength can be prepared on the workpiece substrate. The coating has excellent properties such as wear resistance, corrosion resistance, and thermal shock resistance, effectively extending the service life of the workpiece.