Application of Beam Thermal Spraying in Metallurgical Industry

       Information Abstract: The metallurgical industry is an important field for the application of thermal spraying technology. Due to the harsh working conditions of the metallurgical industry, the corrosion and wear are very serious, so thermal spray coatings are used on many components, such as blast furnace tuyere, fan, furnace roll, hot-rolled plate conveying roll, support roll, straightening Rolls, galvanized lift rolls, sink rolls, etc. The thermal spray coating on these parts greatly improves the work efficiency, reduces the cost, improves the quality of the product, and has obvious benefits.

The metallurgical industry is an important field for the application of thermal spraying technology. Due to the harsh working conditions of the metallurgical industry, the corrosion and wear are very serious, so thermal spray coatings are used on many components, such as blast furnace tuyere, fan, furnace roll, hot-rolled plate conveying roll, support roll, straightening Rolls, galvanized lift rolls, sink rolls, etc. The thermal spray coating on these parts greatly improves the work efficiency, reduces the cost, improves the quality of the product, and has significant benefits.



1. Application in blast furnace tuyere



①The blast furnace tuyere is made of copper and copper alloy. It works under harsh conditions such as high temperature, particle erosion, and iron solution corrosion. The general life is only 30 to 100 days. In Japan, it needs to be replaced in one year, and the ceramic layer is used. After that, the life span reaches 1000 days, which greatly improves the economic indicators of the blast furnace.



②The surface of the blast furnace charge bell is sprayed with cemented carbide coating, which can greatly improve the wear resistance of the charge bell.



2. Pre-protection of blast furnace slag mouth



The blast furnace slag port is a key spare part for slag production, and the working conditions are bad, and it is often scrapped due to burn through. The spray-welded nickel-based alloy coating is used for pre-protection, which increases the life of the slag mouth by more than two times and greatly reduces the air-off time.



3. Improve the life of blast furnace cooling stave



Strengthening the blast furnace cooling furnace wall is an important measure to prolong the life of the main structure of the blast furnace. Foreign blast furnace



Wall life (without repair) has been increased from 4-5 years to 8-9 years or more. my country's blast furnace



The inside of the wall is made of 20# steel pipe as the cooling pipe, which is seriously affected by gas phase corrosion and carburization in the long-term use. At present, the average life of blast furnace cooling stave in my country is 2 to 4 years, and two intermediate repairs are required to maintain a 10-year life. It is an effective way to spray a layer of anti-carburization coating on the surface of blast furnace cooling water pipe