Jfe Steel Corporation

Masaru Miyake

Hideyuki Takahashi

Gentaro Takeda

Yoshitsugu Suzuki

Shunsuke Sasaki

Yoichi Makimizu

Yoshikazu Suzuki

Jun Eto

Satoshi Ueoka

Yukio Kimura

Masato Sasaki

Soshi Yoshimoto

Naoki Nakata

Nobuo Nishiura

Takumi Koyama

Hiroto Goto

Sonomi Shirasaki

Masayuki Horie

Yu Terasaki

Shinichiro Aoe

Yusuke Yasufuku

Atsushi Inaba

Toshihiro Miwa

Takaomi Kato

Yukuya Tamura

Provided are a steel-shape measurement device and a steel-shape correction device. The steel-shape measurement device measures a distance to a detection spot group on a to-be-scanned surface of a steel product with a laser rangefinderA that measures the distance through scanning of a steel product S with a laser beam emitted from one laser light sourceand redirected with a galvanometer mirrorand measures a shape of the steel product from obtained measured-distance data. The steel-shape measurement device includes an object having a 45&#xb0;-0&#xb0; diffuse reflectance of equal to or lower than 10% as a laser-beam absorberat least one portion within an irradiation range irradiated with a regular-reflected laser beam from a to-be-scanned surface of the steel product.

Steel-products shape measurement device and steel-products shape correction device

A method for manufacturing a metal sheet comprising pinching the metal sheet in rapid quenching between a pair of pinch rolls in the range where the temperature of the metal sheet is from (T+150) (&#xb0; C.) to (T&#x2212;150) (&#xb0; C.), wherein the Ms temperature of the metal sheet is T(&#xb0; C.) and the Mf temperature thereof is T(&#xb0; C.), as well as a rapid quenching unit comprising a pair of pinch rolls capable of use in such a method.

Method for manufacturing metal sheet and rapid quenching unit

A method of producing a galvannealed steel sheet includes: annealing a steel strip by conveying the steel strip through a heating zone including a direct fired furnace, a soaking zone, and a cooling zone in this order in an annealing furnace; hot-dip galvanizing the steel strip discharged from the cooling zone; and heat-alloying a galvanized coating formed on the steel strip. Mixed gas of humidified gas and dry gas is supplied into the soaking zone from at least one gas supply port located in a region of lower &#xbd; of the soaking zone in a height direction so that a dew point measured in a region of upper &#x2155; of the soaking zone in the height direction and a dew point measured in a region of lower &#x2155; of the soaking zone in the height direction are both 20&#xb0; C. or more and 0&#xb0; C. or less.

Method of producing galvannealed steel sheet

A method for manufacturing a hot-rolled steel sheet having a large thickness and a large width, a larger sheet width and a lower temperature can stably be cut at a cutting load equal to that of a conventional steel sheet having a usual sheet thickness, a usual sheet width and a usual temperature. In a rough rolling step, the steel sheet is formed so that the shortest length L (mm) from a concave portion bottom to a convex portion top of the fishtail shape satisfies Equation (1) mentioned below, and an intermediate portion between the concave portion bottom and the convex portion top, defined as a desired cutting location, is cut:(2+30)&#x2264;&#x2264;300&#x2003;&#x2003;(1),in which X is a maximum deviation (mm) of the cutting location of a crop cutting machine and 0&#x2264;X&#x2264;90.

Method for manufacturing hot-rolled steel sheet, steel sheet cutting location setting device, steel sheet cutting location setting method, and steel sheet manufacturing method

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Tokyo, Japan

Masaru Miyake