Jfe Steel Corporation

Takumi Koyama

Hideyuki Takahashi

Yu Terasaki

Hidetoshi Inoue

Syuhei Nishinaka

Takashi Doi

Masato Sasaki

Toshiki Fujii

Reona Aishima

Shoji Kasai

Masahiro Yoshikawa

Teruhiko Tobe

Masaru Miyake

Yoshihiko Kaku

Kenji Yamashiro

Yutaka Yanagisawa

Yusuke Yasufuku

Kenji Tsuboi

Atsushi Inaba

A gas wiping nozzle manufactured from parts divided along the slit length direction and maintains a gap in the width direction over the length direction in high temperature atmospheres and a method for manufacturing a hot-dip metal strip. In a gas wiping nozzle, a first and a second nozzle member are each divided along the length direction X of a slit into a plurality of nozzle members. The dimension of a divided face of the first nozzle member is 1.5Tor more in a section of the first nozzle member where Tis the thickness of the first nozzle member in the width direction Z of the slit, and the dimension of a divided face of the second nozzle member is 1.5Tor more in a section of the second nozzle member where Tis the thickness of the second nozzle member in the width direction Z of the slit.

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

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

A sealing device is installed in heating treatment equipment through which a steel strip passes, the device including a rotary damper which is placed above the steel strip so as to be in contact with the steel strip, and a roll which is placed below the steel strip so that the roll opposes the rotary damper to form a pair consisting of the rotary damper and the roll opposing each other, the steel strip passing through a gap, which is formed between the rotary damper and the roll opposing each other, in which two pairs each of which is the pair consisting of the rotary damper and the roll opposing each other are arranged in tandem in a moving direction of the steel strip in the heating treatment equipment, and an inert gas is fed into a space defined by the two pairs arranged in tandem.

Sealing device

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

Takumi Koyama