A Method for Predicting the Position of Surface Defects of Hot Rolled Coil in the Thickness Direction of Casting Slab

Abstract

The invention discloses a method for predicting the position of surface defects of a hot-rolled coil in the thickness direction of a casting blank, and belongs to the technical field of hot rolling. The method for predicting the position of the surface defect of the hot-rolled coil in the thickness direction of the casting blank includes the steps that the macroscopic morphology of the surface of the hot-rolled coil is observed, and the width of the linear surface defect of the hot-rolled coil is measured; the hot-rolled coil is cleaned; the distance between the section defect of the hot-rolled coil and a surface layer is measured, and the thickness of a scale layer of a heating furnace is obtained; the distance between the upper edge of foreign matter in the casting blank and the surface layer of the casting blank is calculated, and then the distance between the linear surface defect of the hot-rolled coil and the surface of the casting blank in the casting blank can be quantitatively calculated; flame cleaning is performed on the casting blank according to the calculated position of the linear surface defect in the thickness direction of the casting blank. By means of the method for predicting the position of the surface defect of the hot-rolled coil in the thickness direction of the casting blank, the position of the linear surface defect on the casting blank can be obtained, then the surface of the casting blank can be effectively cleaned, and surface defects of the hot-rolled coil can be reduced without increasing plate blank loss.

Description

technical field [0001] The invention relates to the technical field of hot rolling, in particular to a method for predicting the position of surface defects of hot-rolled coils in the thickness direction of a cast slab. Background technique [0002] With the progress and development of steel production technology, a number of hot rolling and cold rolling production lines at home and abroad have been put into operation one after another. The quality of cold and hot rolled steel products has been significantly improved. Iron and steel enterprises put forward higher requirements. IF steel (interstitial-free steel) is a steel grade with high added value and good deep-drawing performance, which has been widely used in the manufacturing of automobiles, cans and other products. However, in recent years, surface defects of ultra-low carbon IF steel hot-rolled sheets still frequently appear in domestic steel mills, especially surface strip defects are more serious, and have become t...

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Problems solved by technology

[0003] The invention provides a method for predicting the position of surface defects of hot-rolled coils in the thickness direction of the slab, which solves or partially solves the problem that the specific size of the surface of the slab for cleaning cannot be given in the prior art, resulting in the cleaning thickness being too large. Thinness cannot reduce the surface defects of hot coils, and the technical problem of cleaning up the thickness that is too large will increase the loss of the slab

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