Method for preparing high-speed steel composite roll for hot rolling

Abstract

The invention discloses a method for preparing a high-speed steel composite roll for hot rolling. The method is characterized by comprising the following steps of: firstly, manufacturing a regenerated high-speed steel composite roll collar by adopting an electroslag hollow stripping method; melting low-cost nodular cast iron or plain carbon steel by utilizing an intermediate frequency furnace or an electric arc furnace; manufacturing a roll core by a casting method; and fusing the roll outer collar and the roll core together in the manner of casting to prepare the composite roll for the hot rolling, wherein the working roll collar of the composite roll for the hot rolling is made of high-speed steel, and the roll core is made of the nodular cast iron or the plain carbon steel. The high-speed steel composite roll prepared by the method disclosed by the invention has the characteristics that the outer layer thickness is even, the tissue is fine and compact, and the nodular cast iron or the plain carbon steel is adopted to serve as the material of the roll core. The quality of the working face of the roll is comprehensively improved by utilizing the dual action of rare earth treatment and electroslag refining during a process of manufacturing the roll collar, and the service life is long. A roll body and the roll core are respectively made of the nodular cast iron or plain carbon steel, so that the integrated cost is low. The method disclosed by the invention is suitable for manufacturing the high-speed steel composite roll for the hot rolling and can be widely applied in metallurgical industry and renewable resource industry.

Description

[0001] technical field [0002] The invention relates to a preparation method of a high-speed steel composite hot rolling roll, which belongs to the technical field of metal materials. Background technique [0003] The development trend of roll materials researched in recent years is to widely use alloying elements and gradually increase the degree of alloying, so that more and harder carbides are formed on the surface of the roll body to improve the wear resistance of the roll. High-speed steel is used in the manufacture of rolls because of its high hardness, good red hardness and good wear resistance. There are mainly methods of forging and centrifugal casting to manufacture high-speed steel composite rolls. Using the forging method, cracks are prone to appear during the forging process, and forged high-speed steel rolls still have the disadvantages of low yield, high energy consumption, large processing volume, and long process flow. The main problem of manufacturin...

AI Technical Summary

Problems solved by technology

Using the forging method, cracks are prone to appear during the forging process, and the forged high-speed steel rolls still have disadvantages such as low yield, high energy consumption, large processing volume, and long process flow.

The main problem of manufacturing high-speed steel rolls by centrifugal casting is WC, VC segregation and cracks. In addition, when the molten steel falls and impacts the high-speed rotating mold, the coating layer on the surface of the mold may crack or even peel off. When the coating cracks, the molten steel drills into the cracks and sandwiches the surface coating, resulting in surface inclusions on the roll.

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