| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling method which can prevent the occurrence of a surface defect in the cooling of a continuously cast bloom. SOLUTION: A bloom 3 prepared by pouring molten steel from a tundish 1 of a vertical continuous casting machine and casting the steel in a mold 2 is cut into a predetermined length with a cutting torch 4. The cut bloom 3 is then carried to a bloom cooler 5 which is a cooling device provided outside the continuous casting machine. In the bloom cooler 5, when the surface temperature of the bloom has a temperature at or above an Ar<SB>3</SB>transformation point, cooling water is jetted on the bloom 3 through a cooling spray nozzle 6 provided within the bloom cooler 5. In this case, as the surface temperature of the bloom approaches the Ar<SB>3</SB>transformation point, the flow rate of the jetted cooling water is increased to increase the cooling rate. The bloom 3 is then taken out of the bloom cooler 5 to provide a cooled bloom free from a surface defect. COPYRIGHT: (C)2003,JPO
|
