Blast furnace tuyere is a typical application of laser remanufacturing in the steel and metallurgical industry. The blast furnace tuyere is mainly made of high-purity copper, and the operating environment is extremely harsh. It not only has to withstand high temperatures above 1500 degrees but also withstands the erosion of high-temperature iron flow, charge, and slag Due to the poor wear resistance of copper, the tuyere damage of the blast furnace is more serious. Laser cladding cobalt-based alloy is used for repair. The cobalt-based alloy has good wear resistance at 600 degrees high temperature without sacrificing the thermal conductivity of Cu alloy. The service life of the repaired blast furnace tuyere is increased by 4 times.