| 摘要 |
PROBLEM TO BE SOLVED: To provide a water tank for water cooling of a billet capable of reducing partial brightness unevenness and scab. SOLUTION: The water tank for cooling the billet by immersing the billet in water is provided with a billet supporting section for supporting the billet in the water tank in such a manner that its broad surfaces turn into top and under surfaces and a water injector which injects the water to the under surface of the billet supported by the billet supporting section. The water injector is preferably so disposed that its water injection direction is made into a direction perpendicular to or diagonal with the under surface of the billet and at this time, the distance between the water injection position and the under surface of the billet is preferably set at 30 to 500 mm. By such water tank, the billet can be immersed into the water in such a manner that its broad surfaces turn into the top and bottom surfaces and the water can be injected to the under surface of the billet. As a result, the partial brightness unevenness and scab which occur when especially the continuously cast chromium steel billet containing 5 to 30wt% Cr is rolled down to a cold rolled steel sheet can be reduced. COPYRIGHT: (C)2005,JPO&NCIPI
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