COOLING DEVICE OF HOT ROLLED STEEL SHEET AND COOLING METHOD OF HOT ROLLED STEEL SHEET

To equalize a temperature in a plate width direction of a hot rolled steel sheet even if a hot rolling threading guide is arranged between transport rolls.SOLUTION: A cooling device of a hot rolled steel sheet has multiple cooling water nozzles 23 for injecting cooling water on an upper surface of a steel plate transfer area. The cooling water nozzle 23 is provided so that a cooling water collision area R of the upper surface of a steel plate conveyance area A1 is positioned in a width peripheral area A3 except a threading guide area A2 of a width central part opposed to a threading guide 20 in a steel plate conveyance direction view and formed in an area overlapping with a central axis Q of a conveyance roll in a plan view. Further, an injection axis P1 of the cooling water nozzle 23 is provided inclined to a normal Pof the upper surface of the steel plate conveyance area A1 in steel plate conveyance direction view so that the cooling water injected from the cooling water nozzle 23 and collided with the cooling water collision area R is directed to the outside in a plate width direction.SELECTED DRAWING: Figure 9 【課題】搬送ロール間に熱延通板ガイドが配置されている場合であっても、熱延鋼板の板幅方向の温度を均一にする。【解決手段】熱延鋼板の冷却装置は、鋼板搬送領域の上面に冷却水を噴射する複数の冷却水ノズル２３を有し、冷却水ノズル２３は、鋼板搬送領域Ａ１の上面の冷却水衝突領域Ｒが、鋼板搬送方向視において通板ガイド２０と対向する幅中央部の通板ガイド領域Ａ２を除いた幅周辺領域Ａ３に位置し、平面視において搬送ロールの中心軸Ｑと重なる領域に形成されるように設けられ、かつ、冷却水ノズル２３の噴射軸Ｐ１が、当該冷却水ノズル２３から噴射され冷却水衝突領域Ｒに衝突した冷却水が板幅方向外側に向かうよう、鋼板搬送方向視において鋼板搬送領域Ａ１の上面の垂線Ｐ０に対して傾けられて設けられる。【選択図】図９