Method capable of reducing thickness of decarburized layer of hot-rolled heavy rail steel

Abstract

The invention discloses a method capable of reducing the thickness of a decarburized layer of hot-rolled heavy rail steel. The method is characterized in that a heavy rail casting blank is manufactured into the heavy rail steel through heating and rolling; the weight percentage of Cr in the heavy rail casting blank is 0.1-0.14%; and in the heating procedure, during rolling-delay heat preservation, the temperature of a heating zone is controlled at 1230 DEG C and below, and the temperature of a soaking zone is controlled at 1250 DEG C and below. By optimizing the alloying components of the heavy rail casting blank and the rolling-delay heat preservation rule, the yield of the decarburized layer can be raised to above 96%, the method has the advantages of simple technology, high operability and significant effect, and the problem that the thickness of the decarburized layer exceeds the standard due to the fact that the rolling-delay time of the heavy rail casting blank is too long can be solved effectively. With the adoption of the method, the production efficiency is improved, the yield of the rolled steel is raised substantially, the heavy rail performance yield is raised, and thus the reduction of the cost is realized.

Description

technical field [0001] The invention relates to a steel rolling method, in particular to a method capable of reducing the thickness of the decarburized layer of hot-rolled heavy rail steel. Background technique [0002] With the rapid development of high-speed railways, the domestic and foreign rail markets have higher and higher requirements for high-speed rails. Due to the high carbon content of high-speed rails, oxidative decarburization is prone to occur during heating in the furnace, resulting in a thicker decarburized layer, resulting in a low yield. Decarburization of rails can lead to defects such as reduced mechanical properties, reduced hardness, poor wear resistance and reduced fatigue strength. In China, the thickness of the decarburized layer of high-speed rails is listed as one of the important indicators, and it is stipulated that the thickness of the decarburized layer should not be greater than 0.5mm. At present, there are many sporadic production accident...

AI Technical Summary

Problems solved by technology

At present, there are many sporadic accidents in the production of large-scale factories. The resulting long heating time affects the thickness of the decarburization layer and the decarburization pass rate. Therefore, it is extremely important to reduce the thickness of the decarburization layer to increase the pass rate of decarburization.

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