Descaling method and rolling method for slab

鋼片のスケール除去法および圧延法

Abstract

(57)【要約】 【目的】 鋼片の熱間圧延工程において、所定の温度に 加熱された鋼片の表面に生成するスケールを確実に除去 する。 【構成】 鋼片5の熱間圧延工程において、加熱炉と熱 間圧延機との間に配置される脱スケール装置7により脱 スケールを行うに際し、所定温度に加熱された鋼片5の 表面にドライアイス粒を噴射して、鋼片5の表面を局部 的に冷却しながらドライアイスの衝突力によりスケール を完全に除去する。
PURPOSE: To completely and surely remove the scale formed on the surfaces of a heated slab by injecting dry ice grains to the slab. CONSTITUTION: The heated slab 5 is transported to a descaler 7 by a transporting table 6 just before hot rolling. The descaler 7 peels the scale by injecting the dry ice grains from 4 units of dry ice spraying nozzles 8, 8, 8, 8 disposed therein to the slab 5 formed with the scale on the surface by heating, thereby cleaning the slab. The scale pieces peeled therefrom are completely removed by the high-pressure fluid injected from high-pressure spray nozzles 9 for blowing off the peeled scale pieces. The slab is hot rolled after the descaling. As a result, the generation of indentation flaws on the product surfaces is prevented. COPYRIGHT: (C)1994,JPO&Japio

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