Method for controlling strip steel head and tail widths through coil box production process

Abstract

Disclosed is a method for controlling strip steel head and tail widths through a coil box production process. The method is characterized in that six parameters of the steel type, the width, the side pressure amount, the hot rolling thickness and the coiling box utilization mode are set in a width control system of a coil box in a 2250mm hot rolling production line; head and tail short stroke width control is performed on account of the six parameters, that is, vertical roll opening degree adjusting is performed once at an interval of 300mm in a 1.5m length range of the head and tail of a strip steel entering an edging mill; and the hot rolling thickness is set to be in a range of a first grade and a third grade, that is, the thickness of the first grade is smaller than 2.9mm, the thickness of the second grade is larger than or equal to 2.9mm and smaller than 12.5mm, and the thickness of the third grade is smaller than or equal to 2.9mm. According to the method, the dimension control accuracy of the head and the tail of the 2250mm hot rolling production line are improved greatly, the hit rate in a range of 0mm to 12mm is improved to 94.7% from 90%, the width abnormal product rate is reduced to 0.5% from 1.86%, and the width and quality of products are improved greatly.

Description

technical field [0001] The invention belongs to the field of steel rolling, and in particular relates to a technology for controlling the head and tail width of hot-rolled strip steel in a hot-coil box of a 2250mm rolling mill. Background technique [0002] The hot coil box is located between the roughing mill and the finishing mill of the hot continuous rolling production line. Its function is to coil the rough-rolled intermediate billet, and then reversely uncoil it into the finishing mill. The tail of the strip in the coiling process using a hot coil box becomes the head of the strip in the uncoiling process, thereby reducing the temperature difference between the head and the tail of the strip; the coiling process also reduces the heat dissipation on the surface of the intermediate billet, reducing the rolling of the finishing mill In addition, because the longer intermediate billet is coiled into coils, the total length of the rolling line can be shortened, and construc...

AI Technical Summary

Problems solved by technology

Coiling with a hot coil box makes the direction of the head and tail of the intermediate billet exchanged. The strip steel adopts the same parameters of the head and tail short stroke width control (SSC) for coiling with a hot coil box and the straight-through mode of the hot coil box, and the control accuracy of the product width is low. , the phenomenon of super wide head and tail or wide negative is serious, causing large economic losses

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