Nippon Steel Sumitomo Metal Corporation

Spraying Systems Co., Japan

Hitoshi Nikaidoh

Yoshihiro Serizawa

Isao Yoshii

Shigeru Ogawa

Tetsuo Kishimoto

Noriyuki Hishinuma

Yasuhiro Nishiyama

Shinji Ida

Nobuhiro Takagi

Masaki Yamamoto

Hirokazu Kotake

Ryuuji Yamamoto

Satoru Uchijima

Hiromitu Kurita

A full cone spray nozzle comprising: a nozzle body () having a liquid inlet () at its upstream end and a spray orifice () at its downstream end; a vane structure () of an axial direction length (W) and diameter (D) arranged with its outer circumferential surface in contact with the inside of the nozzle body (); has a plurality of channel grooves () of width (T) and depth (H) at the outer circumferential surface of the vane structure (); an upstream side projecting part () of a length (U) in the axial direction of the nozzle body () at an upstream side of the vane structure (); a downstream side projecting part () of a length (P) in the axial direction of the nozzle body () at a downstream side of the vane structure (); and a swirl flow chamber () of an axial direction length (L) which is a space formed by an inside wall surface of the nozzle body (), the vane structure () and the spray orifice (), wherein 0.25&#x2266;T/D&#x2266;0.30, 0.25&#x2266;H/D&#x2266;0.30, and 1.5&#x2266;L/W&#x2266;3.5 are satisfied.

Full cone spray nozzle

The present invention provides a method of cooling a hot-rolled steel strip which has passed through a finishing rolling, including: cooling the hot-rolled steel strip from a first temperature of not lower than 600&#xb0; C. and not higher than 650&#xb0; C. to a second temperature of not higher than 450&#xb0; C. with cooling water having the water amount density of not lower than 4 m/m/min and not higher than 10 m/m/min, wherein with respect to the area of the target surface, the area of a portion where a plurality of spray jets of the cooling water directly strikes on the target surface is at least 80%.

Cooling device of hot-rolled steel strip

Cooling method of hot-rolled steel strip

Growing community of inventors

Tokyo, Japan

Hitoshi Nikaidoh