Nippon Steel Corporation

Yasumitsu Kondou

Tooru Akashi

Masao Sakashita

Shuuichi Hamausu

Suppression and removal of scales are efficiently carried out in a steel material hot rolling process and the time of pickling treatment as a successive step is greatly shortened. In a water cooling step of metallic material at a temperature of 100&deg; to 1,200&deg; C., scales are removed by applying a direct current or an alternating current to metallic material at 0.1 to 10 A/m of unit surface area from pinch rolls to rolls or apron guides on the outlet side of a hot rolling mill and/or by injecting cooling water at a pH value of &minus;2 to 4 onto the metallic material from cooling headers and apron guides

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Futtsu, Japan

Yasumitsu Kondou