Device and method for regulating and controlling flowing and solidification of secondary cooling area of special steel through dynamic combined magnetic fields

Abstract

The invention discloses a device and a method for regulating and controlling flowing and solidification of a secondary cooling area of special steel through dynamic combined magnetic fields and belongs to the field of electromagnetic metallurgy. According to the device for regulating and controlling flowing and solidification of the secondary cooling area of the special steel through the dynamic combined magnetic field, first electromagnetic flow control equipment is arranged at a position, with the casting blank solid fraction of 15% to 25%, in the secondary cooling area, and second electromagnetic flow control equipment is arranged at a position, with the casting blank solid fraction of 55%-65%, in the secondary cooling area. According to the method, the solid fraction and the blank shell thickness in the solidification process of the special steel are obtained according to different special steel components; the combined magnetic fields are arranged at different solid fraction positions, power frequency is selected according to the thickness of a blank shell, and the current intensity when the stirring intensity is 20-30 cm / s is obtained by calculating flow field values under different current effects; and when the electromagnetic flow control equipment in the secondary cooling area is singly regulated and controlled, and the horizontal flow velocity of the molten steel still cannot be maintained to be 20-30cm / s, the flow velocity is regulated by enhancing or weakening the current intensity of the other electromagnetic flow control equipment, so that a dynamic response is formed.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic metallurgy, and in particular relates to a device and a method for regulating the flow and solidification of special steel in a secondary cooling zone by a dynamic combined magnetic field. Background technique [0002] Special steel is also called alloy steel, which is to add one or several alloy elements to carbon steel in an appropriate amount to change the structure of the steel, so that the steel can achieve various special properties. The solute content in special steel, especially Cr, Ni, etc., far exceeds that of ordinary carbon steel, which will cause poor thermal conductivity, large temperature gradient of molten steel during solidification, and uneven heat dissipation, which leads to coarse microstructure of the billet and columnar crystals. Developed, thus hindering the flow of molten steel during solidification. In addition, in order to improve the performance of special steel...

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Problems solved by technology

[0006] In view of the large temperature gradient, well-developed columnar crystals and poor fluidity of molten steel in the continuous casting process of the above special steel, which eventually lead to uneven distribution of solute, resulting in problems such as central segregation, central shrinkage cavity and central crack, as well as the existing equipment structure Complicated, and due to the skin effect, the energy consumption is greatly increased, and the corresponding continuous casting parameters cannot be used for different special steels, etc.

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