Jfe Steel Corporation

Yu Terasaki

Hideyuki Takahashi

Masato Sasaki

Takumi Koyama

Hidetoshi Inoue

Masaru Miyake

Yoshihiko Kaku

Toshiki Fujii

Kenji Yamashiro

Syuhei Nishinaka

Yusuke Yasufuku

Reona Aishima

Atsushi Inaba

Kenji Tsuboi

Provided is a method of producing a hot-dip metal coated steel strip with which a hot-dip metal coated steel strip of high quality can be produced by sufficiently suppressing edge overcoating. The method comprises spraying gas from a pair of gas wiping nozzlesA andB onto a steel strip S while being pulled up from a molten metal bathto adjust a coating weight of molten metal on both sides of the steel strip S, wherein a pair of baffle platesandare respectively placed outside of both transverse edges of the steel strip, and a height B of a lower end of each of the pair of baffle platesandwith respect to a bath surface of the molten metal bath is set to +50 mm or less, where an upper side in a vertical direction is positive.

Method of producing hot-dip metal coated steel strip and continuous hot-dip metal coating line

A gas wiping nozzle configured to blow wiping gas onto a metal strip includes a first nozzle member and a second nozzle member provided to face each other, in which a slit as a gas blowing port is formed to extend in a length direction between end portions of the first nozzle member and the second nozzle member on the metal strip side; and a shim member configured to adjust a gap of the slit in a width direction orthogonal to the length direction, wherein the shim member is made of a ceramic material or a carbon material, each of the first nozzle member and the second nozzle member has a groove portion, and the shim member is fitted into both of the groove portions of the first nozzle member and the second nozzle member and fixes the first nozzle member and the second nozzle member.

Gas wiping nozzle and method of manufacturing hot-dip metal coated metal strip

Disclosed is a method of producing a hot-dip metal coated steel strip capable of sufficiently suppressing generation of bath wrinkles and producing high-quality hot-dip metal coated steel strip at low cost. The disclosed method of producing a hot-dip metal coated steel strip includes: blowing a gas from a pair of gas wiping nozzlesA andB to a steel strip S while being pulled up from a molten metal bathso as to adjust a coating weight of molten metal on both sides of the steel strip S, in which each of the gas wiping nozzlesA andB includes an injection port portion that is installed downward with respect to a horizontal plane such that an angle formed by the injection port portion and the horizontal plane is 10&#xb0; or more and 75&#xb0; or less, and has a header pressure below 30 kPa.

Method of producing hot-dip metal coated steel strip and continuous hot-dip metal coating apparatus

Growing community of inventors

Tokyo, Japan

Yu Terasaki