Method for controlling effective reduction interval of casting blank

Abstract

The invention relates to a method for controlling an effective reduction interval of a casting blank, the effective reduction interval refers to an interval in which soft reduction is implemented in a casting blank solidification process to improve segregation of a core part of the casting blank, and when the reduction is started to be implemented, the thickness of a blank shell is not less than 30% of the total thickness of the standard specification of the casting blank; when heavy pressing is started, the thickness of a blank shell is not less than 1 / 3 of the total thickness of a casting blank in the standard specification; and pressing at least at the position corresponding to the position where the center solid fraction fs of the casting blank approaches but does not exceed 0.75, taking the position as the tail end of the effective pressing interval, and preferably obtaining a wider effective pressing interval. The effective reduction interval obtained according to the method can ensure that the casting blank obtains the optimal soft reduction effect, and continuous casting machines with different sections are guided to apply the soft reduction technology to effectively improve segregation.

Description

technical field [0001] The invention relates to the technical field of light reduction in the solidification process of a cast slab. Background technique [0002] With the development of special steel technology, there are more and more varieties of high carbon steel, and the requirements for the quality of high carbon steel continue to increase. Light reduction technology has a significant effect on solving this problem and has been regarded by the industry as one of the most effective methods to control slab segregation. However, in the implementation process, it is difficult to control the range of light reduction of the billet. In the process of continuous casting, the reduction is too early, and the billet shell is thin, which will lead to cracks in light reduction; not ideal. How to determine the effective reduction interval to achieve the best reduction effect and improve segregation has always been a difficult problem for enterprises. SUMMARY OF THE INVENTION ...

AI Technical Summary

Problems solved by technology

However, it is difficult to control the range of soft reduction of the casting slab during the implementation process. The reduction is too early in the continuous casting and straightening process, and the billet shell is thin, which will lead to light reduction cracks; the reduction is later to improve the effect of segregation not ideal