Control method for shape of thin hot-rolled structural steel plate

Abstract

The invention discloses a control method for the shape of a thin hot-rolled structural steel plate. The control method aims to reduce stress concentration in the production process, systematically optimize the hot rolling process and relieve the problem of the shape of a finished product plate. The control method is characterized by comprising the steps that (1) the rolling temperature and speed are designed, and the dynamic recovery process of a high-temperature deformation structure of a substrate is controlled; (2) the size of a continuous casting blank is selected, and cooling adjustment is conducted in the process of rolling strip steel and after the rolling of the strip steel, so that temperature distribution is improved, and sufficient thermodynamic conditions are provided for structure evolution; and (3) motor torque optimization is conducted based on coiling tension, and local uneven deformation, generated under the high-tension condition, of the thin hot-rolled structural steel plate in the coiling process is avoided. Steel coils are stacked in a centralized mode after being discharged from a production line, and the internal and external temperature difference is reducedthrough waste heat. According to the control method, reservoir area slow cooling facility does not need to be additionally arranged, production line transformation is not involved, the implementationcost is low, and the control method has good applicability.

Description

technical field [0001] The invention relates to a method for controlling the shape of a thin-gauge hot-rolled structural steel plate, which belongs to the technical field of production of structural steel for hot-rolled cold forming. Background technique [0002] The development of the manufacturing industry has put forward higher requirements for hot-rolled strip products, and the thin-gauge hot-rolled strip steel and its quality stability control have received more and more attention from iron and steel enterprises. Plate shape is an important quality index of hot-rolled strip steel, which directly affects the processing and use of downstream users. In actual production, the process window of thin-gauge strip steel is narrow, and the shape control is difficult. Changes in the production process and equipment status will cause fluctuations in the shape quality. [0003] Systematic research has been carried out around the hot-rolled strip shape problem, mainly including two...

AI Technical Summary

Problems solved by technology

[0004] The method of optimizing the flatness control module is reflected in the improvement of the conventional flatness control system. The flatness defects generated during the rolling process can be compensated by optimizing the roll management and the flatness control strategy of the rolling mill. Plate shape problems caused by internal stress

Improving the quality of the plate shape by improving the traditional process often requires sending the off-line steel coils to the heat preservation pit, slow cooling treatment in the heat preservation cover, or adding an internal stress relief annealing process and then smoothing, which directly affects the production efficiency of the product and increases production. cost

Images