Steel And Metallurgy
The service environment of the parts of iron and steel metallurgy equipment on the production line is mostly high temperature, high variable load, alternating heat and cold, corrosion, wear and fatigue conditions. Some cast iron parts are prone to corrosion and wear during use, and need to be replaced and maintained regularly. Especially in the production and processing of high-end automotive steel sheets, the surface quality of rolls, transfer rolls and other parts is extremely demanding. For such components with large consumption and high maintenance frequency, how to further effectively improve service life and reduce maintenance costs is crucial to the development of the industry. At present, the surface protective layers of steel metallurgical equipment parts are mostly prepared by electroplating, thermal spraying, arc surfacing and other methods. The application of laser cladding technology can more effectively improve the service life of parts coatings, reduce maintenance links, and have greater flexibility in terms of coating thickness and coating performance regulation.
• Ultra-high-speed laser cladding
It can be used for efficient preparation of wear-resistant and high-temperature resistant coatings on the surfaces of shaft parts of different sizes, such as rolls, process rolls, and transmission rolls. Compared with conventional laser cladding, the heat input is small and the thermal impact on the matrix material is very small. When repeated repairs and reprocessing are performed, resistance will not be caused by the excessively large and hard matrix heat affected zone; another major advantage is that the coating The hardness distribution on the surface of the layer is uniform, and the steel plate will not be scratched due to local superhardness.
• Conventional laser cladding repair
Conventional laser cladding can be used for surface coating preparation of oversized and oversized shaft parts, as well as repair and remanufacturing of locally damaged parts. For example, blast furnace tuyere nozzle, large circular saw, universal joint sleeve, flat head cover, cross head, reducer gearbox, etc.
• Ultra-high-speed laser cladding of cold-rolled looper rolls
As an important key component of a rolling mill, the surface quality of the cold-rolled looper roll has a great influence on the quality and production efficiency of rolled steel. During the rolling process, the cold-rolled looper roll undergoes the dual action of cycle and thermal cycle, and the surface will produce failure defects such as oxidation, cracks, wear, and even broken rolls. Using ultra-high-speed laser cladding technology, the alloys, ceramics and composite cladding powders are melted together with the surface metal of the cold-rolled looper roll after laser beam treatment, and solidified into a cladding layer with excellent performance, the surface hardness of which can reach HRC65 The above provides a guarantee for the cladding layer to obtain excellent wear resistance, corrosion resistance, fatigue resistance and high temperature resistance, and achieves the purpose of saving precious materials. Therefore, the ultra-high-speed laser cladding technology is suitable for the surface repair of local wear, impact, erosion, and oxidation corrosion of the roll.
• Idler laser cladding
The guide pulley is an important spare part with large consumption in the hot-rolled bar production line, which affects the technical and economic indicators such as the operation rate of the rolling mill. Many guide pulleys have insufficient heat resistance, sticking to steel, wear resistance, and poor thermal fatigue performance during use, which affects the service life and the quality of the rolled material. Laser cladding technology has the advantages of low dilution rate, small heat-affected zone, and easy automation of the process. It can be used to improve the wear resistance, corrosion resistance, fatigue resistance and crack resistance of the guide wheel. Generally, the thickness of cladding is only 1-3mm, and the hardness can reach HRC65 or more. The cladding guide wheel can be put into use again, the service life is prolonged, and the production cost is greatly saved.