Composite overlaying manufacturing method of casting roller

Abstract

The invention discloses a composite overlaying manufacturing method of a casting roller. The method comprises the steps of 1) manufacturing a base body of the casting roller, and processing the surface of the base body; 2) preheating the base body; 3) sequentially manufacturing a bottom layer and a transition layer in the periphery of the base body by overlaying; 4) overlaying surface covering layer on the surface of the transition layer to form the casting roller, wherein the surface covering layer comprises the following chemical elements and components in percentage by mass: 0.3 to 0.8% of C, 1.0 to 4.8% of Mn, 0.4 to 6.0% of Si, 4.0 to 8.0% of Cr, 0.01 to 1.0% of Ti, 2.0 to 10% of V, 2.0 to 10.0% of W, 1.0 to 6.0% of Mo, 2.0 to 5.0% of Co, 0 to 0.4% of Ca, 0 to 0.4% of Ba, 0 to 0.5% of rare earth element, and the balance of Fe and other inevitable impurities; 5) tempering the casting roller by slowly heating and slowly cooling, wherein the tempering is performed under a temperature of 560 to 600 DEG C.

Description

technical field [0001] The invention relates to a method for manufacturing rolls, in particular to a method for manufacturing rolls with low speed, high temperature and large rolling force. Background technique [0002] As an important branch in the field of welding, surfacing composite manufacturing is a surface technology treatment process, which is a process of depositing a layer of materials with certain properties on the surface of parts by welding. The surfacing composite manufacturing process has been well developed and applied in the field of rolls, especially the repair of hot rolls. It is found through research that surfacing welding on the surface of the roll can significantly prolong the service life of the roll and reduce the consumption of rolling steel. Generally, medium-carbon alloy steel is used as the base material of the surfacing composite roll, which has ideal strength and toughness after the matrix quenching and tempering treatment. In addition, the op...

AI Technical Summary

Problems solved by technology

[0005] The above two Chinese patent documents both involve continuous casting and rolling mills, in which the casting and rolling rolls are the core equipment of the continuous casting and rolling mills, and the casting and rolling rolls are all under relatively harsh working conditions. The contact temperature is high and the rolling force is high. Under such working conditions, casting rolls are prone to cracks and roll breakage, which greatly shortens the service life of the rolls, thereby increasing production costs and restricting the use of continuous casting and rolling mills.

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