Manufacturing method for reducing edge defects of hot-rolled strip steel

Abstract

The invention relates to a manufacturing method for reducing edge defects of hot-rolled strip steel. The manufacturing method comprises the following steps: carrying out heating control, and heating a slab to 1190-1230 DEG C; setting the width model load, calculating a rough rolling width model according to the thickness and width of the slab and a finished product, and setting the rolling reduction of each pass of a rough rolling vertical roll and a flat roll; carrying out rolling by the rough rolling vertical roll, setting the opening degree of a rough rolling machine E1 and a rough rolling machine E2 according to the model calculation result, and carrying out slab width control; and carrying out rolling on the slab subjected to rolling by the vertical roll through the flat roll, and reducing the thickness of the slab. According to the manufacturing method, process and control optimization are carried out on the basis of existing equipment, so that equipment investment is avoided; the existing process system and logic control are not changed, so that the current production process control is not affected; and adverse effects on other quality indexes such as width control are avoided.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled steel strips, in particular to a manufacturing method for reducing edge defects of hot-rolled steel strips. Background technique [0002] During the rolling process of hot-rolled strip steel, the slab is widened by vertical rolls in the rough rolling area to obtain the required finished width of the strip steel, such as figure 1 process shown. The side pressure of the vertical roll (10-50mm) is relatively small relative to the slab width (1000-1650mm), which is a typical deformation problem of super-high parts. Because the deformation is not easy to penetrate, the middle part of the slab width hardly produces plastic deformation, and the deformation is mainly Concentrated in the local area of ​​the edge of the slab, it cannot penetrate the entire width of the slab, and it is easy to form uneven deformation at a certain distance from the edge, and the local thickness increases and bulges, formi...

AI Technical Summary

Problems solved by technology

The processing of the vertical roll is difficult, the requirements for the lathe are high, and the adaptability to different slab thicknesses is poor, which increases the uneven wear of the roll surface

Images