Nippon Steel Sumitomo Metal Corporation

Nippon Steel Corporation

Primetals Technologies Japan, Ltd.

Tomofumi Hosho

Yoichi Haraguchi

Kazuaki Kobayashi

Keisuke Matsuda

Kenji Horii

Yoshihiro Serizawa

Yuji Ikemoto

Hiroshi Niitani

Rumi Matsumoto

Nobumasa Hayashi

Naoko Katou

Takumu Ushizawa

The present cooling device includes: when cooling regions obtained by dividing an entire cooling region into a plurality of portions in a steel sheet conveyance direction and three or more portions in a width direction are set as divided cooling surfaces, a cooling water nozzleand a switching device that switches between collision and non-collision of cooling water jetted from the cooling water nozzlewith the divided cooling surface, the cooling water nozzleand the switching device provided for each of the divided cooling surfaces; and a control device that controls operation of the switching device based on a width-direction temperature distribution. The cooling water nozzlehas a jet axis P inclined with respect to a vertical line to the entire cooling region when viewed in the steel sheet conveyance direction, and the cooling water goes to the side opposite to the cooling water nozzlein the width direction after colliding with the divided cooling surface.

Cooling device for hot-rolled steel sheet and cooling method of 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

A manufacturing apparatus comprises a final stand, with standing side members, and a cooling apparatus. The cooling apparatus comprises rows of upper surface cooling nozzles, rows of lower surface cooling nozzles, and an upper surface guide on the upper surface side of the steel sheet. An end portion of the cooling apparatus on a side of the final stand is arranged between the standing side members of the housing. When defining a width of a uniformly cooled region, an average gap distance (W) between the end portion of the width of the uniformly cooled region and the standing side member of the housing; a gravity acceleration rate, an average water volume density of the width of the uniformly cooled region, and a value determined by Wand an average distance h between the upper surface guide and the upper surface of the steel sheet, a specific relation is satisfied.

Manufacturing apparatus of hot-rolled steel sheet and manufacturing method of steel sheet

A cooling apparatus of a steel sheet, which is excellent in discharging water without hindering the movement of a steel sheet, is disposed on a lower process side of a final stand in a row of hot finish rolling mills. The apparatus includes a plurality of cooling nozzles arranged to cool a steel sheet transported on transporting rolls, wherein the cooling nozzles are arranged on upper and lower surface sides of an area in which the steel sheet passes. A lower surface guide is arranged on the lower surface side with the lower surface guide comprising inlet holes through which cooling water sprayed from the cooling nozzles on the lower surface side passes and outlet holes through which the cooling water passes, dropping downwardly to be discharged. The inlet holes and the outlet holes are arranged alternately in a moving direction of the steel sheet.

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

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Kashima, Japan

Tomofumi Hosho