Method for controlling surface quality of steel for hot rolling pickling

Abstract

The invention relates to a method for controlling the surface quality of steel for hot rolling pickling. The method comprises planned prevention and control and process prevention and control. According to the method, the good surface quality of the steel for the hot rolling pickling is guaranteed, so that the defect of fine pores of the oxidized scale is effectively improved, and the quality objection about external pitting is reduced by 96%.

Description

technical field [0001] The invention belongs to the field of steel rolling technology, in particular to a method for controlling the surface quality of hot-rolled steel for pickling. Background technique [0002] With the continuous improvement of steel rolling technology, the quality of hot-rolled sheet is approaching that of cold-rolled sheet, so that "replacing cold with heat" can be realized technically. Hot-rolled pickled plate is a product with high cost performance between cold-rolled plate and hot-rolled plate. With the improvement of hot-rolled technology, hot-rolled pickled plate has the ability to reach the dimensional accuracy of cold-rolled plate And surface quality, has a good market development prospects. And with the rapid development of automobile, machinery, light industry and other industries, enterprises are facing tremendous pressure brought by market competition, and the requirements for product cost and product quality are increasing day by day. Hot-r...

AI Technical Summary

Problems solved by technology

[0012] 1) The arrangement of the rolling plan is unreasonable, the rolling kilometers are too long or the products with high surface requirements are arranged in the later stage of the rolling plan;

[0013] 2) Excessive load on the stand in the front stage of finishing rolling, excessive rolling force causes peeling of the oxide film on the roll;

[0014] 3) The roll cooling system is unreasonable or the use of roll cooling water is poor, which affects the establishment of roll oxide film;

[0015] 4) The temperature of the rough rolling intermediate billet is too high, which leads to the excessive temperature rise of the rolls in the front section of the finish rolling, which affects the state of the roll oxide film;

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