Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Nippon Steel Hardfacing Corporation

Futoshi Nishimura

Yasushi Kurisu

Hiroyuki Tanaka

Junya Takahashi

Masaaki Omodaka

Masafumi Matsumoto

Yoshihiro Yamada

Katsuya Kojima

Satoshi Uchida

Atsushi Migita

Yuuki Mishima

Hayato Konnai

A hot dip metal plating bath roll preventing flaws in a steel sheet due to a bath roll, realizing stable running at a high speed, and improving the productivity of a plated steel sheet, which hot dip metal plating bath roll having vertical grooves each formed on an outer circumferential surface of the roll and including two first curved parts projecting to the outside of the roll and at least one second curved part arranged between the two first curved part and projecting to the inside of the roll and horizontal grooves each formed on an outer circumferential surface of the roll along a barrel length direction of the roll, a pitch P(mm) and depth d(mm) of the vertical grooves satisfying 1.0&#x2264;P&#x2264;10, 0.2&#x2264;d&#x2264;5, and d&#x2264;P/2, a depth d(mm) being 60% to 150% of the depth dof the vertical grooves, and a width w(mm) of the horizontal grooves being 2 times or more of the depth dor 2 times or more of a radius of curvature (mm) of curved surfaces forming bottom parts of the horizontal grooves and 0.7 times or less of a pitch P(mm), the pitch P(mm) of the horizontal grooves being 1.0&#x2264;P&#x2264;10.

Hot dip metal plating bath roll and method of production of hot dip metal plating bath roll

A steel sheet shape control method includes, (A) setting a target correction shape of the steel sheet at a position of an electromagnet to a curved shape, (B) measuring a steel sheet shape when electromagnetic correction is performed, (C) calculating the steel sheet shape in a nozzle position based on the steel sheet shape, (D) repeating (B) and (C) by resetting the target correction shape to a curved shape having a smaller amount of warp, (E) when the amount of warp of the steel sheet shape at the position of the nozzle is less than the upper limit value, (F) calculating vibration of the steel sheet at the position of the nozzle, and (G) adjusting a control gain of the electromagnet until amplitude of vibration is less than a second upper limit value when the amplitude of the vibration is equal to or more than the second upper limit value.

Steel sheet shape control method and steel sheet shape control apparatus

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Tokyo, Japan

Futoshi Nishimura