High-strength high-wear-resistant bainite cast steel used for block cast middle groove, and preparation technology thereof

Abstract

The invention discloses high-strength high-wear-resistant bainite cast steel used for a block cast middle groove, and a preparation technology thereof. The preparation technology comprises the following technical steps: preparing raw materials and evanescent modes, carrying out raw material hot melting, casting the evanescent modes, carrying out diffusion annealing preprocessing, carrying out caststeel salt bath quenching and tempering and detecting cast steel quality. The bainite cast steel used for the middle groove has the characteristics of high strength and high wear-resistant performance, the middle groove is subjected to integral casting forming, and the problem that all positions have inconsistent wear resistance is avoided. When a work surface is turned, maintenance is not required, the current work surface is directly turned to a next work surface, and the coal mining efficiency is improved. Meanwhile, since the materials of different positions are different, so that the effect of new goods are traded for old goods is realized, waste middle groove can be recovered and recast, waste is recycled, and the fully mechanized mining cost of users is greatly lowered, thus realizing an important meaning for the energy and material saving, the circular economy and the sustainable development of coal production.

Description

technical field [0001] The invention relates to the technical field of middle groove production, in particular to a high-strength and high-wear-resistant bainite cast steel for integral casting of a middle groove and a preparation process thereof. Background technique [0002] At present, although domestic manufacturers have many methods to improve the wear resistance of the middle groove, they cannot fundamentally improve the wear resistance of the middle groove. By welding the wear-resistant layer in the middle groove and changing the casting of the groove The method of increasing the wear resistance of the groove by material only changes the wear resistance of the groove, and will cause many problems such as interfering with the transportation of the scraper and processing difficulties. The method of improving the wear resistance of the middle plate and the bottom plate in the middle groove will not only increase the running resistance of the middle groove, but also inc...

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Problems solved by technology

[0002] At present, although domestic manufacturers have many methods to improve the wear resistance of the middle groove, none of them can fundamentally improve the wear resistance of the middle groove. The method of using materials to increase the wear resistance of the groove side only changes the wear resistance of the groove side, and will cause many problems such as interference with scraper transportation and processing difficulties. Layer and the method of welding wear-resistant layer on the surface of the middle plate to improve the wear resistance of the middle plate and the bottom plate of the middle groove will not only increase the running resistance of the middle groove, but also increase the production cost, and the materials of each part are different. The difference in shrinkage may easily lead to open welding of the middle plate, falling of the back cover plate, damage of the tongue plate, etc. The method of replacing the middle plate and the bottom plate with a plate with high wear resistance to improve the service life of the middle tank is not only costly, but also Moreover, due to the different materials, the wear resistance of each part is inconsistent, and the thinning of the upper edge of the groove is easy to cause floating chains, which endangers the safe operation of miners.

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