Method for determining an edge shielding interval of hot-rolled strip steel, shielding method and control system

Abstract

The embodiment of the invention provides a method for determining an edge shielding interval of hot-rolled strip steel. The method for determining the edge shielding interval of the hot-rolled strip steel comprises the following step (1) of acquiring an internal stress evolution rule of the strip steel in the width direction in a cooling process; and the step (2) of setting the edge shielding interval based on the internal stress evolution rule. According to the method, from the internal stress evolution rule of different positions in the plate width direction, edge shielding is carried out in the area with the phase change stress larger than thermal stress, the phase change process is slowed down, and therefore the relative expansion amount of the edge is reduced; the phase change stress is reduced, and the internal stress distribution non-uniformity in the plate width direction is reduced; and the edge wave defect is overcome.

Description

technical field [0001] The invention relates to the field of hot-rolled steel strips, in particular to a method for determining a shielding interval at an edge of a hot-rolled strip and a shielding method. Background technique [0002] During the laminar cooling process of hot-rolled strip steel, the cooling water will flow to the edge of the steel plate, so that the cooling rate in the edge area in the width direction of the plate is greater than that in the middle area, resulting in uneven distribution of the temperature field in the plate width direction during the laminar cooling process. In addition, the initial temperature difference at the exit of finish rolling (the finishing temperature is high in the middle and low at the edge) is also one of the reasons for the uneven distribution of the temperature field in the width direction of the plate. The uneven distribution of the temperature field will lead to uneven distribution of thermal stress on the one hand; on the ...

AI Technical Summary

Problems solved by technology

Starting from the evolution law of internal stress at different positions in the plate width direction, it is proposed to implement edge shielding in the area where the phase transition stress is greater than the thermal stress to slow down the phase transition process, thereby improving the asynchrony of the phase transition and reducing the risk of internal stress distribution in the plate width direction. Inhomogeneity, improve edge wave defect

Images