Hot-rolled section steel roll and its production method

Abstract

A hot-rolled section steel roll, with the material of brand SGA1 as the outer layer and the material of brand QT500‑5 as the core material. After heat treatment, the metallographic composition of the outer layer changes, such as: at a depth of 0mm from the surface, by 30% ~35% carbide, 5%~7% graphite, and matrix with lamellar structure pearlite, transformed into 15%~18% carbide, 6%~8% graphite, and fine granular pearlite and acicular structure the matrix. The hot-rolled profiled steel roll provided by the invention is produced by a centrifugal composite bimetallic casting method, which not only greatly increases the alloy content of the outer layer of the roll, but also further improves the wear resistance and thermal crack resistance of the product. After actual rolling, the amount of passing steel has increased by more than 30%, and there is no phenomenon of ring collapse or roll breakage. Reduce the direct cost of roll consumption by more than 30% for iron and steel enterprises.

Description

technical field [0001] The invention relates to a component used in metal manufacturing, in particular to a rolling roll used in metal rolling, and a manufacturing method thereof. Background technique [0002] Metal calendering rolls are installed in pairs on the rolling mill, supported by bearings and exerting pressure reaction force, driven by the transmission shaft and controlled the rotation speed, and the pass of the roll body directly contacts the rolled object and causes it to produce predetermined plastic deformation. A metal rolling tool. [0003] Rolls for hot rolling are subject to combined effects of cold and heat fatigue, mechanical load, friction, internal stress, etc. during the steel rolling process. Therefore, there are special requirements for the properties of the roll materials. [0004] figure 1 It is a schematic diagram of an embodiment of the existing hot-rolled channel steel roll under the rolling condition, such as figure 1 As shown, under the act...

AI Technical Summary

Problems solved by technology

[0009] In practice, the disadvantage of this kind of roll is that since the integral casting can only cast liquid metal of one material, if the content of wear-resistant alloy is further increased, the supercooling degree of the liquid metal at the core and neck of the roll body will decrease. increase, carbides will be precipitated, and then the tensile strength of the roll neck will be greatly reduced, and the probability of roll breakage will be greatly increased

[0011] So far, no hot-rolled section steel rolls (especially large-scale channel steel rolls) that can greatly improve wear resistance and ensure no ring collapse, and a reliable manufacturing method have not been found.

Images