Grate bar material and production method thereof as well as combined pouring unit of sintering machine

Abstract

The invention relates to a production method of a grate bar material of a sintering machine. The production method mainly solves the problems that a high-alloy grate bar is complex in production process, relatively high in production cost, difficult in casting flaw control, non-uniform in performance and the like in the prior art. The technical scheme of the invention is as follows: the grate bar material of the sintering machine comprises the following chemical components in percentage by mass: 1-1.5% of C, 1.5-2.5% of Si, 1.2-2.2% of Al, 2.5-3% of Mn, 11-15% of Cr, 0.3-0.8% of Mo, 0.01-0.03% of Nb, 0.01-0.03% of Ti, 0.03-0.1% of Re, less than or equal to 0.06% of P, less than or equal to 0.06% of S, and the balance of Fe and inevitable impurity elements. A sand casting process of 'one pouring with more molds' is applied, so that the aluminum content and the casting flaws of a silicon grate bar are reduced, and the production cost is reduced. A heat treatment furnace provided with a flow guide circulating fan is applied to low-temperature uniform heat treatment on a cast so as to improve the performance uniformity of casts of the same batch. By adopting the production method disclosed by the invention, a grate bar product of the sintering machine, which is good in process stability, good in performance and relatively low in production cost, can be obtained.

Description

technical field [0001] The invention relates to the technical field of grate bars, in particular to a sintering machine grate bar material and its production method and mold, which have the advantages of low production cost, good process stability, less casting defects, high temperature resistance, wear resistance and oxidation resistance , impact resistance, uniform performance and so on. Background technique [0002] The grate bar is one of the key wearing parts of the sintering machine trolley. There are many grate bars arranged in sequence on the sintering machine trolley. The bosses between adjacent grate bars are connected, and gaps are formed between the grate bars. The arranged and combined grate bars are used to carry sintering raw materials, ventilate and sinter. During sintering, the temperature of the sintered ore can reach about 1100°C in a short period of time (about 15 minutes), and the surface temperature of the grate bars can reach 800-950°C, and it will co...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a production method of a sintering machine grate bar with relatively high content of aluminum and silicon elements, which takes into account the comprehensive performance of high temperature resistance, wear resistance, oxidation resistance and impact resistance, and mainly solves the high The production process of alloy grate bars is more complicated, the production cost is higher, the casting defects are difficult to control, and the performance is not uniform, etc.

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