Research and Application of Environmental Remanufacturing Technology for Hydraulic Support Columns

27SiMn steel, which was commonly used for hydraulic support columns, was treated by chrome plating, laser cladding and cladding welding. The microstructure, microhardness, wear resistance and corrosion resistance of the coating were tested and compared. Considering the actual production factors, the economic benefits and environmental friendliness of the three processes were compared. The results show that the chrome plating coating exhibits high hardness and wear resistance, but its corrosion resistance is poor; the laser cladding coating has lower hardness and wear resistance, but its corrosion resistance is better; the hardness of the cladding coating is 498.9 HV, which is about 0.74 time than that of the electroplated chrome coating, the grinding loss is 0.03862 g, which is about 1.34 times than that of the electroplated chrome coating, the corrosion weight loss is 0.00126 g, which is about 0.12 time than that of the electroplated chrome coating, and0.75 time of the laser cladding. Cladding coating has excellent corrosion resistance while maintaining high hardness and wear resistance. In addition, the production cost of the cladding welding process is extremely low, pollution-free, and it has long-term economic and social benefits for the mining bracket industry.