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Method for controlling effective reduction interval of casting blank

A control method and billet technology, applied in the field of light reduction, can solve the problems of difficult interval control, unsatisfactory segregation effect, cracks, etc., and achieve the effect of improving segregation and avoiding unsatisfactory effect.

Pending Publication Date: 2022-06-28
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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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

Method used

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Embodiment Construction

[0014] The present invention will be further described in detail below with reference to the embodiments, which are exemplary and should not be used as limitations on the technical solutions claimed in the present application.

[0015] (1) An effective reduction interval suitable for high carbon steel. When the reduction starts, the thickness of the billet shell reaches 30% of the total thickness of the standard specification of the billet; when the heavy reduction begins, the thickness of the billet shell reaches the total thickness of the standard specification of the billet. One of the rollers of the tension leveler must be pressed at the position where the central solid phase ratio is 0.7 to 0.75, and the effective reduction range is relatively wide; Continued reduction can improve billet porosity, but has little effect on segregation improvement.

[0016] (2) The thickness of the billet shell refers to the solid billet shell, excluding the solid and liquid regions during ...

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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 ...

Claims

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Application Information

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IPC IPC(8): B22D11/12B22D11/16
CPCB22D11/1206B22D11/16
Inventor 葛洪硕刘吉刚任一峰饶立华钱俊阳俞晓东顾宇豪
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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