High-speed steel composite roller and casting method thereof

Abstract

The invention belongs to the field of steel rolling manufacture, specifically is a high-speed steel composite roll for strip mill in steel rolling industry and casting method thereof. The outer layer of the composite roll is made of high-speed steel, the middle layer is made of ductile cast iron base iron or graphite semisteel, the core is made of ductile cast iron. The invention employs centrifugal compound foundry technique, the roll is moulded by three times of casting. Constant centrifugal rotating speed is kept in centrifuge, the metal material of the outer layer and the middle layer are mould cast, and then the metal of the roll core is statically cast to form the final product. Compared with former dual-layer or other three-layer composite high-speed steel rolling rolls, the three layers of metal of the high-speed steel composite roll of the invention are well combined and have high strength; the optimal selection of the material of the middle layer improves the strength of the bonding layer, the carbide affecting the binding performance in the middle layer is reduced, the spreading of alloy element in the outer layer high-speed steel to the core, which affects the core material performance, is also effectively avoided by the middle layer, cracking and dropping off of the working layer in hot processing and rolling process are prevented as well.

Description

technical field [0001] The invention belongs to the field of steel rolling manufacturing, in particular to a high-speed steel compound roll used in a strip mill in the steel rolling industry and a casting method thereof. Background technique [0002] With the rapid development of the metallurgical industry, the continuous improvement of rolling technology, the continuous improvement of rolled material quality requirements, and the need for energy saving, energy saving, environmental protection, and sustainable development strategies, the rolling mill uses high performance, high wear resistance, and The requirements for accident-prone rolls are also becoming more and more urgent. High-speed steel rolls are favored due to their high wear resistance and long service life. However, there have always been various technical barriers in the manufacture of high-speed steel rolls in China, and it is difficult to move forward. More technologies are only in the research stage and cann...

AI Technical Summary

Problems solved by technology

These technologies have not been promoted and applied due to limitations such as poor combination, poor accident resistance, complex process, high cost, and unreasonable structural design.

[0004] The high-speed steel roll adopts two-layer composite. Due to the large difference in the composition of the inner and outer layer materials, it is easy to cause the alloy elements of the outer layer material to melt into the inner layer during the actual centrifugal casting process, resulting in an increase in the carbide content of the core material, and even more carbide It is distributed in a network shape, so that the strength of the core material of the roll is reduced, and the roll is prone to breakage during the rolling process

In addition, due to the unreasonable selection of the material of the intermediate layer, the bonding defects such as graphite distortion at the bonding part, increase in carbide content, and carbide network formation are caused, and cracks are initiated at the bonding position during use, and crack propagation causes the working layer to fall off, etc.

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