Heat treatment method for improving hardness uniformity of wear-resistant steel surface

Abstract

The invention relates to the technical field of wear-resistant steel, in particular to a heat treatment method for improving the uniformity of surface hardness of wear-resistant steel. The heat treatment method for improving the uniformity of surface hardness of wear-resistant steel of the present invention comprises the following steps: 1) carrying out shot blasting treatment on the wear-resistant steel plate in a hot-rolled state; 2) entering the steel plate after shot blasting treatment into a roller hearth type continuous heat treatment furnace Heating; 3) using high-pressure water in the spiral roller gap type pressure quenching machine to perform quenching treatment; wherein, the water volume of the high-pressure section of the quenching machine is 2800~3000m3 / h, and the water volume of the low-pressure section of the quenching machine is 2300~2500m3 / h; 4 ) Tempering the quenched steel plate. The wear-resistant steel plate produced by the production method of the invention has good hardness uniformity, excellent plate shape and good surface quality, the unevenness of the steel plate reaches 0-3 mm / m, and a tempered martensite structure is obtained. The preparation method is simple and practical.

Description

technical field [0001] The invention relates to the technical field of wear-resistant steel, in particular to a heat treatment method for improving the uniformity of surface hardness of wear-resistant steel. Background technique [0002] As we all know, one-third to one-half of the world's materials are consumed every year due to wear and tear. Among the current wear-resistant materials, wear-resistant steel is the most widely used. It is often made into mechanical parts such as construction machinery, mining machinery, coal mining machinery, and crushers. It is widely used in metallurgy, mining, building materials, electric power, railways, and military affairs. In various departments, such as bulldozers, loaders, excavators, dump trucks and various mining machinery, grabs, stackers and reclaimers, feeding bending structures, crusher jaws, crushing walls, rolling mortar walls, tractor track shoes, Fans grind impact plates and railway switches, etc. Many key components wil...

AI Technical Summary

Problems solved by technology

But on the whole, there are two problems in the wear-resistant steel in domestic steel mills: (1) Most of the domestic quenching machines use roll-gap pressure quenching machines. Since the roller table equipment is a spiral water-separating roller, this will cause the surface of the steel plate to contact The amount of water is uneven, resulting in quenching watermarks on the surface, and poor hardness uniformity; (2) The unevenness of thin-gauge products is poor, resulting in almost all high-grade and thin-gauge wear-resistant plates imported in my country

[0005] Publication number CN102191363A, titled as a Chinese patent application for a production method of a wear-resistant steel plate with a thickness of 2 to 15mm, which adopts a roll-gap pressure quenching machine for quenching treatment. In order to ensure the shape of a thin plate, it is undoubtedly necessary to increase the reduction of the quenching machine , to ensure that the steel plate is not deformed during the quenching process, so that there is an unavoidable problem in the industry that the protruding part of the water dividing roller corresponding to the position of the steel plate has a small amount of water and a low cooling rate, which leads to watermarks in quenching and the formation of a technical bottleneck of uneven hardness

At the same time, the invention is limited to the production method of 2-15mm wear-resistant steel plates, which cannot meet the production requirements for products with specifications above 16mm.

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