Method for cooling hot-rolled steel strip
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United States of America Patent
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Jan 29, 2013
Grant Date -
Jun 21, 2012
app pub date -
Dec 16, 2010
filing date -
Dec 16, 2009
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Abstract
The present invention provides a method for cooling a hot-rolled steel strip after a finishing rolling in which a transportation speed varies, the method including: setting a transportation-speed changing schedule on the basis of a temperature of a steel strip before the finishing rolling and a condition of the finishing rolling; performing a first cooling in which the hot-rolled steel strip is cooled under a film boiling state in a first cooling section; performing a second cooling in which the hot-rolled steel strip is cooled with a water amount density of not less than 2m3/min/m2 in a second cooling section; and coiling the hot-rolled steel strip, in which a cooling condition is controlled in the first cooling so as to satisfy 0.8≦(T2a′−T2a)/ΔTx≦1.2.
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