Nippon Steel Sumitomo Metal Corporation

Nippon Steel Corporation

Nippon Steel & Sumikin Coated Sheet Corporation

Tooru Oohashi

Yoshihiro Suemune

Akio Saito

Satoru Tanaka

Satoshi Uchida

Hiroshi Kanai

Masato Kageyama

Takeshi Yasui

Nobuyuki Shimoda

Yasuhide Morimoto

Shiro Fujii

Nobuki Shiragaki

Katsuya Kojima

Katsuhiro Hamaguchi

Shinichi Fukuoka

Yoko Amano

Nayuta Kawazu

Kohhei Hayakawa

Yoshikazu Yamanaka

Hiroshi Nakata

Kazuki Machida

A pass roll for a hot-dip galvanized steel sheet manufacturing facility, the pass roll includes: a roll body; and a heat-resistant felt layer covering the roll body, wherein the heat-resistant felt layer has a thermal decomposition temperature of 420&#xb0; C. or higher and has a surface hardness evaluation index at 400&#xb0; C. of more than 0.11 &#x3bc;m/N.

Pass roll for hot-dip galvanized steel sheet manufacturing facility, hot-dip galvanized steel sheet manufacturing facility, and hot-dip galvanized steel sheet manufacturing method

The present invention provides a cooling device for a hot-dip plating device provided on an upper side of a plating thickness control device in a conveyance route of a hot-dip plated steel sheet that is conveyed from a plating bath in a vertically upward direction. The cooling device includes: a main cooling device that vertically sprays a main cooling gas to the hot-dip plated steel sheet; and a preliminary cooling device that is provided in a preliminary cooling section between the main cooling device and the plating thickness control device in the conveyance route, and sprays a preliminary cooling gas to a plurality of gas collision positions which are set along the preliminary cooling section.

Cooling device for hot-dip plated steel sheet

A method for producing a hot dip plated steel sheet, the method controlling a coating weight by injecting a gas toward a surface of a steel sheet from a time when the steel sheet continuously immersed into a plating bath is pulled up from the plating bath to a time when plating metal adhered onto the surface of the steel sheet is solidified, the method includes: setting an oxygen concentration of a bath surface of the plating bath to be more than or equal to 0.05 vol % and less than or equal to 21 vol % when the gas is injected toward the surface of the steel sheet; and setting an oxygen concentration in a space of an end of the steel sheet at a position where the gas collides with the steel sheet pulled up from the plating bath to be more than or equal to 0.05 vol % and less than or equal to 3 vol % when the gas is injected toward the surface of the steel sheet.

Method for producing hot dip plated steel sheet and apparatus for hot dip plating

A gas wiping apparatus includes a pair of wiping nozzles which are disposed so as to face each other and interpose a coated steel sheet therebetween in a thickness direction of the coated steel sheet, and each of which ejects a wiping gas along a width direction of the coated steel sheet; a gas shield plate that is disposed at a position which separates toward an outside from each end portion of the coated steel sheet so that the gas shield plate is interposed between the pair of wiping nozzles; and a side nozzle that ejects a gas to form a gas flow along each surface of the gas shield plate in a direction reverse to a direction in which the coated steel sheet is pulled upward.

Gas wiping method and gas wiping apparatus

The present invention provides a high-corrosion-resistance hot-dip galvanized steel sheet having excellent appearance uniformity. The steel sheet includes: a coating layer containing Al: 4 to 22 mass %, Mg: 1 to 6 mass %, and Si: 0.001 to 1 mass %, and a balance being composed of Zn and inevitable impurities formed on a surface, in which at an interface between the coating layer and a base steel sheet, MgSi phases and Ca phases each mainly composed of Ca or a Ca compound exist, and at least part of the MgSi phases precipitate by using the Ca phases as a nucleus.

High-corrosion-resistance hot-dip galvanized steel sheet having excellent appearance uniformity and manufacturing method thereof

The present invention provides a hot-dipped steelthat demonstrates favorable corrosion resistance and formability, and has a favorable appearance of a plating layer. The hot-dipped steel of the present invention includes a steel substrate formed thereon with an aluminum-zinc alloy plating layer. The aluminum-zinc alloy plating layer contains Al, Zn, Si and Mg as constituent elements thereof and the Mg content is 0.1% to 10% by weight. The aluminum-zinc alloy plating layer contains 0.2% to 15% by volume of an Si&#x2014;Mg phase, and the weight ratio of Mg in the Si&#x2014;Mg phase to the total weight of Mg is 3% or more.

Hot-dipped steel and method of producing same

Growing community of inventors

Tokyo, Japan

Tooru Oohashi