Control method for improving the surface quality of hot-rolled steel

Abstract

The invention relates to a control method for improving the surface quality of hot rolled variety steel and belongs to the field of steel rolling. The control method comprises the steps of: firstly judging whether the material code of hot rolled variety steel fed by a secondary computer is equal to that of easily corroded variety steel or not; if so, closing cooling water for a G roller bed when a finish rolling final stand load is turned on; opening cooling water for the G roller bed when the finish rolling final stand load is turned off; closing cooling water for a pinch roll, a wrapper roller and coiling block equipment when a signal that the head of strip steel reaches a heat inspection window in front of a coiling machine is switched on; and opening cooling water for the pinch roll, the wrapper roller and the coiling block equipment when a signal that the tail of strip steel reaches the heat inspection window in front of a coiling machine is switched on. According to the control method provided by the invention, the surface corrosion of an inner layer of a steel coil of variety steel is avoided, the surface quality of a finished product is improved, the percent of pass of the steel coil is improved, the objection of customer quality is reduced, and a good benefit is gained.

Description

technical field [0001] The invention belongs to the technical field of coiling hot-rolled steel strips, and is applicable to the coiling process of hot-rolled steel strips. Background technique [0002] The coiler coils the hot-rolled steel strip into steel coils for the convenience of transportation. When the steel coils are transported, the customer finds a large amount of corrosion on the surface of the steel coils of a certain type of steel when the coils are uncoiled. Tracking research and analysis found that after the hot-rolled strip passes through the finishing stand, it enters the reel through the G roller table, pinch roller, and coiling roll, and is rolled into a finished steel coil. Mechanical equipment also needs to be cooled by industrial water. When the strip passes through these equipments, the cooling water of the equipment sprays on the surface of the strip and remains between the coil layers. As the coil cools, the residual water will cause corrosion to ce...

AI Technical Summary

Problems solved by technology

This special type of steel coil has been transported or placed for a long time, and when the steel coil is opened in the next process, it is found that there is a lot of corrosion on the surface between the layers, which seriously affects the product quality and the interests of customers.

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