Metal initial solidification control method in continuous casting crystallizer

Abstract

The invention discloses a control method of metal initial solidification in a continuous casting crystallizer, which belongs to the technique field of metal continuous casting process. The invention can better control the growth of an initial solidified shell, reduce the depth of oscillation marks, and improve the blank shell quality through adjusting the relative position and power of a coil above the crystallizer. The method comprises the concrete steps: the relative position of the coil above the crystallizer is adjusted through measuring the fluctuation condition of the free surface of liquid in the crystallizer, and the heating intensity of the coil is adjusted through measuring the temperature variation condition in the initial solidification region in the crystallizer, thereby effectively controlling the growth of meniscus solidified tissues, improving the solidified tissues, reducing the depth of oscillation marks and the occurrence of other defects, and being favorable for realizing high-efficient continuous casting.

Description

technical field [0001] The invention relates to a method for controlling the initial solidification of metal in a continuous casting crystallizer, belonging to the technical field of metal continuous casting technology. Background technique [0002] Vibration mark is the most common surface defect of continuous casting slab shell, and its generation starts from the negative slip period of mold vibration. At the beginning of the negative slip period, due to the decrease in the temperature of the initial solidification region, the meniscus first solidifies rapidly into a very thin shell tip, and at the same time, the tip of the solidified shell is pushed away from the mold wall under the positive pressure of the mold slag channel; then, if When molten steel overflows, a hook-shaped vibration mark will be formed, otherwise a concave-shaped vibration mark will be formed. The depth or size of vibration marks not only depends on the size of mold flux pressure, but also is closely...

AI Technical Summary

Problems solved by technology

The temperature in this area is high or the gradient is small, the tip of the initially solidified shell is short, and the depth of the vibration marks formed later is shallow; otherwise, the depth of the vibration marks will be very deep, which deteriorates the surface quality of the shell, and in severe cases, it needs to be ground. Hot rolling can only be done after treatment, which will greatly increase the production cost

[0003] In order to control the initial solidification process of the crystallizer, reduce the occurrence of vibration marks and other related defects, and improve the quality of the billet shell, the patent "metal continuous casting crystallizer composite device that can control the initial solidification" can well control the growth of the initial solidification billet shell, Significantly improve the shell quality, but because the position of the coil is fixed and cannot be adjusted, and affected by conditions such as mold vibration and pouring instability, the free liquid level in the mold will fluctuate, which may cause the rise of the free liquid level However, the heating effect of the coil is not obvious due to the contact with the coil, or due to the drop of the free liquid surface; at the same time, it is not considered to better control the growth of the initial solidified shell by changing the power of the coil

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