Steel Joining Process of Tungsten Carbide Roller (1/2)

With the rapid development of technology, the corresponding requirements of rolling industry are also increasing. Roller is the important part of mill, which uses a pair or a set of roller to roll the steel. It mainly endures static and dynamic loads during rolling, abrasion and temperature changes. Common roll hardness testing are Shore and Leeb hardness testing, both of which are rebound hardness testing, surface hardening hardness can reach HS45-105.

However, the roller made by single material has been difficult to meet the changing requirements of rolling today. Although using coating process can guarantee the achievement of specified performance requirements, there are some matching problems in the binding strength between coating layer and the matrix, the coefficient of thermal expansion and other parameters. Furthermore, the higher cost is also the obstacle in the way of promoting.

Composite roller has uniform structure, high density and stable rolling properties, which has become one of the hotspot of many relevant researchers at home and abroad. Tungsten carbide composite roller by steel joining process, on the one hand, it has the advantages of tungsten carbide, such as high hardness, high density, excellent wear resistance and corrosion resistance and low coefficient of thermal expansion; on the other hand, it makes full use of the strength and toughness of steel, which makes tungsten carbide composite roll can meet the most of rolling industry.

Theoretically, connection of different materials is usually difficult than the connection of the same material. This is due to the quality of the connection of different materials not only be affected by the performance of physical and chemical properties of the material itself, which to a greater extent also depends on the performance of the two materials match or not. Tungsten carbide consists of refractory metal carbide as the matrix and binder metal fabricated by powder metallurgy, which has many differences in mechanical properties with common steel (cast iron, cast steel, carbon steel, etc.).

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