Manufacturing method of abrasion-resistant and anti-fracture trolley grate bar

Abstract

The invention discloses a manufacturing method of an abrasion-resistant and anti-fracture trolley grate bar, and belongs to the technical field of furnace grate bars for sintering machine trolleys. The manufacturing method of the abrasion-resistant and anti-fracture trolley grate bar comprises the steps that low alloy cast steel and high chromium abrasion-resistant white mouth cast iron are separately poured into two electric furnaces to be smelted to control the temperature and time of the two electric furnaces, after smelted, low alloy cast molten steel is firstly poured into a casting mold,when the low alloy cast molten steel naturally cools to the critical temperature, namely, when the low alloy cast molten steel reaches a solid phase line, and then the high chromium abrasion-resistant white mouth casting molten iron is cast; and the weight ratio of the low alloy cast molten steel and the high chromium abrasion-resistant white mouth casting molten iron is controlled, and after thelow alloy cast molten steel and the high chromium abrasion-resistant white mouth casting molten iron cast, and then tempering, normalizing heat treatment are carried out. Compared with the prior art,the trolley grate bar prepared by the manufacturing method of the abrasion-resistant and anti-fracture trolley grate bar is tested in a 2#360m<2> sintering machine of a sintering plant for more thantwo years, the service life of the trolley grate bar is more than 4 times of the service life of an original monometallic high chromium cast iron alloy, no phenomenon of excessive burning loss and fracture collapse and scattered of the grate bar exists in more than two years of use, the sintering cost is greatly reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of grate bars for sintering machine trolleys, in particular to a method for manufacturing grate bars for wear-resistant and fracture-resistant trolleys. Background technique [0002] In the smelting and sintering industry, the grate bar is the key component of the sintering machine trolley. The maximum temperature reaches over 900°C during operation, and it is rapidly cooled on the sintering return lane. It is subjected to high temperature oxidation and gas corrosion during work, and the surface oxidizes and falls off. , the gap between the grate bars becomes larger, and when the gap between the grate bars exceeds 8mm, the grate bars will fail. The initial stage of oxidation is accompanied by the growth process, the gap between the grate bars becomes smaller, and the ventilation is poor, which also leads to the failure of the grate bars. Especially when the sintering machine is sintered without bottom mater...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for making a wear-resistant and anti-fracture trolley grate, which can solve the problems of easy damage, failure and short service life of the existing grate

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