Jfe Steel Corporation

Naoki Nakata

Satoshi Ueoka

Takashi Kuroki

Akio Fujibayashi

Shougo Tomita

Hiroyuki Fukuda

Nobuo Nishiura

Toshio Ishii

Takashi Wada

Yukio Kimura

Shinji Koseki

Koichi Nakashima

Hiroto Goto

Minoru Suwa

Sonomi Shirasaki

Masaru Miyake

Kenji Hirata

Katsuhiro Takebayashi

Shogo Tomita

Takayuki Furumai

Yukio Fujii

Motoji Terasaki

Eitaro Shidara

Seiko Nara

Takaomi Kato

Michio Sato

Shunichi Nishida

Naoto Hirata

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

A batch annealing furnace includes a coil support base on which an end face of a coil is mounted and that supports the coil with an axis of the coil being upright, an inner cover that covers an entire body of the coil mounted on the coil support base, and a cooling pipe that extends downward from the upper part of the inner cover to a cavity of the inner peripheral part of the coil mounted on the coil support base and cools the coil from the inner surface side by passing a coolant through the inside of the cooling pipe.

Batch annealing furnace for coils

Cooling equipment for a hot rolled steel plate which is arranged on a hot rolling line of a steel plate includes an upper header which supplies cooling water to an upper surface of the hot rolled steel plate; upper cooling water jetting nozzles suspended from the upper header for jetting rod-like water flow; and an upper dividing wall arranged between the hot rolled steel plate and the upper header, wherein a plurality of upper water-supply inlets which allow insertion of lower end portions of the upper cooling water jetting nozzles thereinto, and a plurality of upper drain outlets which drain cooling water supplied to upper surface of the hot rolled steel plate on dividing wall are formed in the upper dividing wall.

Cooling equipment and cooling method for hot rolled steel plate

A method for cooling a hot strip conveyed on a run-out table after finishing, including ejecting rod-like flows of cooling water from nozzles to the upper surface of the steel strip such that the flows are inclined toward a traveling direction of the steel strip, and draining the cooling water using draining means disposed downstream of the nozzles.

Method for cooling hot strip

A hot-strip cooling device for cooling a hot strip that has been subjected to finish rolling while being conveyed over a run-out table. The device includes a plurality of cooling nozzles that are disposed above a steel strip and eject rod-like flows of coolant at an ejection angle tilted toward the upstream side in a steel-strip traveling direction; and purging means that is disposed on the upstream side with respect to the cooling nozzles and purges the coolant that has been ejected from the cooling nozzles and resides on the steel strip.

Hot-strip cooling device

A cooling device and a cooling method for a hot strip allow uniform and stable cooling of the strip at a high cooling rate when supplying the coolant to the upper surface of the hot strip. The cooling device includes an upper header unitfor supplying a rod-like flow to the upper surface of the strip. The upper header unitis formed of the first upper header group including plural first upper headersarranged in a conveying direction and a second upper header group including plural second upper headersarranged in the conveying direction. The cooling device is provided with an ON-OFF mechanismto allow each of the upper headersandof the first and the second upper header groups to independently execute the ON-OFF control (start/end injection control) of an injection (feeding) of the rod-like flow.

Device and method for cooling hot strip

A cooling device and cooling method for a hot-rolled strip in which the strip can be uniformly cooled from a leading edge to a trailing edge with coolant by properly realizing a great cooling ability and a stable cooling zone.

Cooling device and cooling method for hot strip

A device and a method for cooling a hot strip capable of uniformly cooling the hot-rolled steel strip from the leading end to the trailing end thereof during cooling of the steel strip using cooling water are provided. A cooling deviceincludes a plurality of tubular nozzlesinclined so as to eject rod-like flows of cooling water to a steel stripat an ejecting angle &#x3b8; in a traveling direction of the steel stripand a pinch rollerdisposed downstream of the tubular nozzles, the steel stripto be nipped between the pinch rollerand a table roller

A hot-strip cooling device and a cooling method are provided wherein uniform cooling of a hot-rolled steel strip using coolant is possible from the leading end to the trailing end of the steel strip. A cooling device () includes a plurality of round nozzles () disposed obliquely in such a manner as to eject rod-like flows of coolant at an ejection angle &#x3b8; toward the upstream side in a direction in which a steel strip () travels, and a pinch roll () disposed on the upstream side with respect to the round nozzles () and configured to pinch the steel strip () in combination with a roller table ().

Hot-strip cooling device and cooling method

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Fukuyama, Japan

Naoki Nakata