Nippon Steel Sumitomo Metal Corporation

Primetals Technologies Japan, Ltd.

Mitsubishi-hitachi Metals Machinery, Inc.

Nippon Steel Corporation

Yuji Ikemoto

Yoichi Haraguchi

Kenji Horii

Koichi Sakamoto

Manabu Eto

Kazuaki Kobayashi

Keisuke Matsuda

Tomofumi Hosho

Yoshiro Washikita

Koichi Matsumoto

Koichi Takeno

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

Provided is a nozzle incorporating a valve, which easily improves durability. The nozzle for spraying water to a targeted object, including a nozzle body provided with a passage of water and a valve arranged inside the passage of the nozzle body, wherein at least a part of an inner surface of the passage including a portion to have contact with the valve is coated by diamond-like carbon.

Nozzle

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 cooling system for a hot-rolled steel strip capable of increasing the cooling rate for rapidly cooling a rolled steel immediately after rolling and suitable for an apparatus for manufacturing a hot-rolled steel strip having a fine-grained structure. For this purpose, guides (A,B) having guiding surfaces () to guide a rolled steel (W) exiting work rolls (A,B) in the conveyance direction are provided at exits of the work rolls in a final stand (Sn) of a finish rolling mill line in a manner that the guides can follow a change in the diameter of the work rolls, a number of injection holes (A,B) are formed in the guides, and a number of rolled steel cooling nozzles (A,B) are provided to spray a large amount of cooling water through the injection holes directly onto the rolled steel.

Cooling system for hot-rolled steel strip

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Hiroshima, Japan

Yuji Ikemoto