Preparation method of hot-rolled strip steel

Abstract

The invention provides a preparation method of hot-rolled strip steel. The method comprises the steps of heating, rough rolling, finish rolling and winding, in the finish rolling process, under the condition of normal rolling production of seven continuous rolling machines F1-F7 of a finishing mill unit, before the strip steel enters a finishing mill, the rolling parameters of the seven continuousrolling machines F1-F7 are input in a controller, the rolling parameters comprise load distribution coefficients and movable sleeve unit tension coefficient, and then the strip steel are put into rolling production; and when the last rolling mill F7 of the finishing mill unit bite steel, and the automatic thickness control AGC gain value is cured according to the measured data of the strip steelhead fed back by a meter. According to the preparation method, through the load distribution, the AGC gain adjustment and the optimization of the movable sleeve tension operation, so that the problemof thickness and width fluctuation caused by rolling of a series of grade silicon steel is solved, the width control precision of the hot-rolled strip steel is improved, the thickness and width fluctuation in actual production control are reduced, the thickness and the width hit rate of the finished product are improved, and the occurrence of the condition of steel stacking is avoided.

Description

technical field [0001] The invention belongs to the technical field of steel processing and manufacturing, and relates to a method for preparing hot-rolled strip steel. Background technique [0002] The thickness and width of the finished hot-rolled strip are important indicators of product quality and performance, and the setting accuracy of rolling parameters determines the performance of the product. In order to ensure that the thickness and width of the finished product meet the process requirements, the position of the Ar3 phase transition of silicon steel should be considered to avoid the fluctuation of rolling force, unbalanced flow rate per second, and tension fluctuation between stands caused by the phase transition. Inaccurate rolling parameters will cause fluctuations in the thickness and width of the finished product, which in turn will affect the thickness and width hit rate of the finished product, and even the occurrence of steel stacking. Contents of the in...

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Problems solved by technology

In order to ensure that the thickness and width of the finished product meet the process requirements, the position of the Ar3 phase transition of silicon steel should be considered to avoid the fluctuation of rolling force, unbalanced flow rate per second, and tension fluctuation between stands caused by the phase transition. Inaccurate rolling parameters will cause fluctuations in the thickness and width of the finished product, which will affect the thickness and width hit rate of the finished product, and even the occurrence of stacked steel

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