Metal strip cooling apparatus, metal strip cooling method, and metal strip manufacturing method

Abstract

To provide a technique for uniformly cooling the whole of a steel sheet so as not to generate strain when cooling a metal strip horizontally conveyed after continuous heating from both sides.SOLUTION: An upper nozzle configured to jet water to an upper surface of the metal strip, a water tank provided such that the metal strip and a water surface of stored water do not come into contact with each other, a water jet nozzle provided upward under the water surface in the water tank, and a controller configured to adjust an amount of water supplied to the upper nozzle and the water jet nozzle, the control means is a device having a function of adjusting a ratio Qu / Qd between an upper total amount of water Qu discharged from the upper nozzles toward the upper surface of the metal strip and a lower total amount of water Qd discharged from the water jet nozzles toward the lower surface of the metal strip to 0.5 to 0.9.SELECTED DRAWING: Figure 1

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