METHOD FOR MANUFACTURING HOT ROLLED COIL AND METHOD FOR PREDICTING DEFECT OF HOT ROLLED COIL EDGE

摘要

The present invention provides a method to manufacture a hot-rolled coil which comprises: a measuring step of measuring aluminum (Al) content (%) and nitrogen (N) content (ppm) of molten steel; an element control step of controlling the aluminum content or the nitrogen content in accordance to multiplying the measured aluminum content and the measured nitrogen content; a thin slab casting step of casting a thin slab with the molten steel using a funnel type-mold; and a production step of producing a heat rolled coil by performing a hot rolling process to the casted thin slab. According to an embodiment of the present invention, aluminum content and nitrogen content within molten steel is measured to predict a defect of the hot rolled coil edge, and elements within the molten steel are controlled such that the number of defects on the edge part of the heat rolled coil may be reduced.