Hitachi, Ltd.

Primetals Technologies Japan, Ltd.

Nippon Steel Sumitomo Metal Corporation

Mitsubishi-hitachi Metals Machinery, Inc.

Posco

Research Institute of Industrial Science & Technology

Primetals Technologies Austria Gmbh

Pohang Iron & Steel Co. Ltd.

Mitsubishi-hitachi Metals

Nippon Steel Corporation

Baoshan Iron & Steel Co., Ltd.

Kenji Horii

Jian Zhang

Tadashi Nishino

Yasutsugu Yoshimura

Tatsunori Sugimoto

Toshiyuki Kajiwara

Tomoaki Kimura

Akio Kuroda

Kenichi Yasuda

Hideo Kobayashi

Akira Sako

Hironori Shimogama

Yuji Ikemoto

Akira Goto

Koichi Seki

Yutaka Fukui

Satoshi Hirano

Takao Funamoto

Hideyo Kodama

Kenjiro Narita

Hidetoshi Nishi

Kenji Hiraku

Koichi Sakamoto

Alois Seilinger

Ichiro Nakamura

Keisuke Matsuda

Mitsuo Nihei

Yan Yu

Shinya Kanemori

Tadahiko Nogami

Hideaki Furumoto

Lukas Pichler

Yoichi Haraguchi

Manabu Eto

Fuminori Ishikawa

Takao Sakanaka

Yuan Fang

Kazuaki Kobayashi

Suguhiro Fukushima

Jian Cui

Toshihiro Usugi

Jong-Sub Lee

Yoshiro Washikita

Ichirou Maeno

Chukichi Hanzawa

Haruyuki Yabe

Youichi Matsui

Hirokazu Nakamae

Shigenori Shirogane

Hiroyuki Sadamori

Jung-Sik Lee

Takashi Kamoshita

Tomofumi Hosho

Takashi Mashiko

Sang-Wook Ha

Roman Winkler

Kenichi Yoshimoto

Jong-Keun Kim

Akihiro Yamamoto

Daisuke Nikkuni

Koichi Takeno

Motoyuki Fujii

Mituru Onose

Manfred Hackl

Hiroki Yamasaki

Hikaru Nakaya

Daisuke Iwaki

Jin-Hee Kim

Hwang-Kyu Hwang

Ki-Chol Kim

Takayoshi Tomino

Yujiro Kobayashi

Syunsaku Kasai

Takao Owada

Jong-Bong Lee

Chun-Soo Won

Youn-Hee Kang

Taro Sato

Tetsuo Kajihara

Shunsuke Murato

Hiroaki Watanabe

Angles of an upper-side pair of an upper work rollA and an upper backup rollA, and a lower-side pair of a lower work rollB and a lower backup rollB are adjusted in a state where the upper-side pair is kept parallel and in a state where the lower-side pair is kept parallel. Thereafter, work-roll pressing apparatusesA andB, work-roll position control apparatusesA andB, backup-roll pressing apparatusesA andB, and backup-roll position control apparatusesA andB are controlled such that the angles of the upper work rollA and the lower work rollB are adjusted in a state where the angles of the upper backup rollA and the lower backup rollB are maintained.

Hot rolling mills and hot rolling methods

A hot rolling millincludes a control apparatusthat adjusts an angle formed between an upper-side pair of an upper backup rollA and an upper work rollA and a lower-side pair of a lower backup rollB and a lower work rollB in a state where the upper-side pair is kept parallel and in a state where the lower-side pair is kept parallel. The hot rolling millis configured such that the work rollsA andB satisfy the condition that DW/Lb is equal to or smaller than 0.30 where DW is a diameter of the work rollsA andB, and Lb is the maximum strip width of a rolled material, and the hot rolling millperforms rolling in a state where a bending force is applied to the work rolls.

A control deviceobtains second pressing forces acting on work-side and drive-side roll chocksA andB on the basis of entry side and exit side first pressing forces, and controls at least one of work roll position control devicesB andB and at least one of work roll pressing devicesB andB changing a position of at least one of the roll chocksA andB in such a manner that a difference between the work-side second pressing force and the drive-side second pressing force is equal to or smaller than a predetermined value.

Rolling mills and rolling methods

Provided are: an upper work roll, radial bearings and a thrust bearing provided on a work side and a drive side of the upper work roll and supporting the upper work roll. Shift cylinders are provided on the work side of the upper work roll and apply forces in both a work side direction and a drive side direction to the thrust bearing. Shift cylinders are also provided on the drive side of the upper work roll and apply forces in both the work side direction and the drive side direction to the radial bearingB. The shift cylinders each apply a force in the same direction to the radial bearing and the thrust bearing when the upper work roll does not shift in an axial direction at least during rolling.

Rolling mill, rolling mill control method, and thrust force supporting method in rolling mill

A six-high rolling (also known as sexto) mill stand that is suited for hot rolling an intermediate strip into a thin strip that is less than 0.8 mm thick. A combined casting and rolling installation that includes the six-high rolling mill stand allowing for hot rolling in long uninterrupted sequences, without any change of the work rolls to obtain a strip with good geometry due to moderate rolling forces.

Six-high rolling mill stand and finishing mill train for hot rolling an intermediate strip into a thin strip

Provided is a nozzle header which sprays pressurized water to a high-temperature object, capable of inhibiting a member provided to spray nozzles from being deformed or damaged by heat at the time of operation, caused by radiation heat from the high-temperature object. The nozzle header for spraying water to a targeted object includes a header which supplies pressurized water, one or more of spray nozzles which spray the pressurized water supplied from the header, and a heat removal structure attached so as to be in contact with at least one of the spray nozzles, wherein the heat removal structure includes a coolant passage through which a cooling medium for cooling the heat removal structure itself and the spray nozzles passes.

Nozzle header, cooling apparatus, manufacturing apparatus of hot-rolled steel sheet, and method for manufacturing hot-rolled steel sheet

Provided is a cooling apparatus discharging water smoothly corresponding to increase of volume density of cooling water securing a high cooling capability. The apparatus disposed on downstream side from a row of hot finish rolling mill, supplying cooling water from above toward a pass line, includes a plurality of cooling nozzles arranged parallel in a pass line direction, and an upper surface guide disposed between the pass line and the cooling nozzles, wherein a predetermined relation is satisfied when defining: a volume density of cooling water sprayed as q(m/(m&#xb7;sec)); a pitch of the cooling nozzle in the pass line direction as L(m); a distance between a lower surface of the upper surface guide and the pass line as h(m); a uniform cooling width as W(m); and a cross-sectional area of virtual flow path of discharging water flowing in a width direction of steel sheet as S(m).

Cooling apparatus, and manufacturing apparatus and manufacturing method of hot-rolled steel sheet

In order to provide a manufacturing device and a manufacturing method for a hot-rolled steel strip, which are capable of obtaining the desired quality of material by rapid uniform cooling immediately after rolling, and improving yield by early sheet tension and sheet shape measurements, a manufacturing device for a hot-rolled steel strip is provided with a finishing rolling mill line (), a first cooling unit () installed just behind the exit side of the finishing rolling mill line, and a pinch roll () which is installed on the exit side of the first cooling unit and in contact with both the upper and lower surfaces of a strip (S), at least a wiping roll () located on the upper side of the strip (S) is disposed between the first cooling unit and the pinch roll, and a tension/shape measuring unit () for measuring the tension and shape of the strip (S); is installed between the wiping roll and the pinch roll.

Manufacturing device and manufacturing method for hot-rolled steel strip

Provided is a method of controlling operation of a tandem rolling mill which enables large reduction rolling in the latter-stage stand of the tandem rolling mill necessary for manufacturing fine-grained steel, and so on. The method comprises: a step of determining a first exit-side sheet thickness in rolling a constant portion of a material to be rolled; and a step of determining a second exit-side sheet thickness in rolling a front end portion of the material, such that a pre-tightening load becomes a set value or less; the material is rolled into the second exit-side sheet thickness, until the front end portion is fed into the stands; the constant portion is rolled by the stand given a pre-tightening load into the first exit-side sheet thickness; and the second exit-side sheet thicknesses of the stands given the pre-tightening load are made larger than the first exit-side sheet thickness.

Method of controlling operation of tandem rolling mill and method of manufacturing hot-rolled steel sheet using the same

An endless hot rolling material shear-joining method capable of threading hot rolling materials in a finish rolling process without strip breakage by controlling joining conditions for the hot rolling materials in an endless hot rolling process for high carbon steel, and an endless hot rolling plant therefor are disclosed. The shear-joining method for endless hot rolling materials of high carbon steel includes shear-joining high carbon steel metal bars comprising, in terms of weight %, 0.30% to 1.20% C, inevitable impurities, and balance Fe, or comprising 0.15% to 1.5% C containing at least one of Cr, Ni, Mo, V, Ti, W, B, Nb, and Sb, inevitable impurities, and balance Fe, such that a joined surface of the joined metal bars is formed to be inclined in a thickness direction of the metal bars, in a hot rolling plant by a joiner adapted to join the metal bars after overlapping tail part of a leading one of the metal bar and top part of a trailing metal bar.

Joining method of high carbon steel for endless hot rolling and the apparatus therefor

A strip rolling mill includes a pair of upper and lower work rolls for rolling a strip, intermediate rolls for supporting each of the paired work rolls, and back-up rolls for supporting each of the intermediate rolls. Each of the work rolls is provided with a tapered portion at one end thereof so that the tapered portions of the work rolls are on opposite sides of roll bodies thereof with respect to roll axis directions. When the material with a constant width is being rolled, axial positions of the work rolls are set at appropriate positions and axial positions of the intermediate rolls are changed to control a thickness distribution in a width direction of the material being rolled. This arrangement significantly improves an edge drop and at the same time minimizes edge drop variations.

Rolling method for strip rolling mill and strip rolling equipment

A multi-row rolling mill has in one housing at least two groups of rolls including at least one pair of work rolls, and constructed so that when the workpiece to be rolled is passed one time, it can be rolled using said respective work rolls. The multi-row rolling mill is characterized in that it is provided with a means for removing the workpiece if the workpiece stops moving between said roll groups.

Multi-row rolling mills, methods of operating these mills, and rolling equipment using the mills

An upper shearing blade equipped with a protrusion of a triangle-columnar shape and a lower shearing blade equipped with a protrusion of the same shape are applied onto the overlapped portion of metal plates to be bonded, and then pressed into the metal plates in an oblique direction inclined with respect to the thickness direction by a stroke in such a range that the metal plates are not completely cut off. The operating loci of the upper, shearing blade and the lower shearing blade are overlapped each other so that one falls inside the other, and the sheared surfaces of the metal plates are formed into a bonded portion by plastic flow deformation. Therein, since a compressive force is applied onto the portions to be bonded, the portion being defined by the amount of overlap, and the portions are compressed to form a compressed portion after completion of bonding, the bonding strength enhances. Besides, since the protrusions on the shearing blades generate a pressing force pressing the sheared surfaces onto each other, by an effect of their inclined surfaces, a compression force applied onto the bonded portion further increases.

Method of bonding metal plates, apparatus therefor and hot strip mill

A widthwise-compressing machine for applying a compression force through press tools to a material to reduce a width of the material while applying vibrations to said material to forcibly vibrate said material has a compression unit for producing a compression force forming a working force, and a vibration-applying unit for applying the vibration to said material. The vibration-applying unit is provided independently of the compression unit. In the widthwise-compressing machine, when the material is plastically worked, the material can be vibrated at an extremely high frequency to make it possible to resonate the material, thereby allowing the plastic-deformation thereof to be promoted.

Widthwise compressing machine and method using vibrations to reduce

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Hiroshima, Japan

Kenji Horii