Hot-rolled section steel roll and preparation method thereof

Abstract

A hot-rolled section steel roll takes a SGA 1 material as an outer layer and a QT 500-5 material as a core material; after heat treatment, the composition of a god phase structure at the outer layer changes, such as that at the position 0 mm deep from the surface, 30-35% of carbide, 5-7% of graphite and a matrix with lamellar pearlite are converted into 15-18% of carbide, 6-8% of graphite and a matrix with a fine grained pearlite and an acicular structure. The hot-rolled section steel roll is prepared by adopting a centrifugal composite bimetal casting method, so that the wear resistance and the thermal cracking resistance of the product are further improved while the alloy content of the outer layer of the roll is greatly improved. Through actual rolling, the steel passing amount is improved by more than 30 percent, and the phenomena of ring breakage and roll breakage are not generated; and the direct cost of roller consumption is decreased by more than 30 percent 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...

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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.

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