METHOD OF COOLING HOT-ROLLED STEEL STRIP

Title:

METHOD OF COOLING HOT-ROLLED STEEL STRIP

Document Type and Number:

WIPO Patent Application WO/2008/053947

Kind Code:

A1

Abstract:

A method of cooling a hot-rolled steel strip which can be implemented at reduced equipment/processing costs, provides little variations in temperature of a steel strip after cooling, and can control with high accuracy a cooling terminating temperature especially in a temperature zone of up to 500°C. A method of cooling a hot-rolled steel strip subjected to hot rolling by bringing it into contact with cooing water, comprising a first cooling step and a second cooling step subsequent to it, wherein the first cooling step stops cooling at a steel strip temperature higher than a transition boiling start temperature, and the subsequent second cooling step cools it with cooling water at a water amount density delivering nuclear boiling. Since passing through a transition boiling temperature zone can be avoided, cooling instability due to transition boiling can be positively avoided, variations in temperature of a steel strip after cooling are small, and a cooling terminating temperature can be controlled with high accuracy.

Inventors:

UEOKA SATOSHI (JP)
KUROKI TAKASHI (JP)
NISHIURA NOBUO (JP)

Application Number:

PCT/JP2007/071275

Publication Date:

May 08, 2008

Filing Date:

October 25, 2007

Export Citation:

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Assignee:

JFE STEEL CORP (JP)
UEOKA SATOSHI (JP)
KUROKI TAKASHI (JP)
NISHIURA NOBUO (JP)

International Classes:

B21B45/02

Foreign References:

JP2005313223A	2005-11-10
JP2004130353A	2004-04-30
JP2005021984A	2005-01-27
JPH10216821A	1998-08-18
JP2005279703A	2005-10-13
JP2001286925A	2001-10-16
JPH06248B2	1994-01-05
JPH0671339A	1994-03-15
JP2000313920A	2000-11-14
JPS5871339A	1983-04-28
JP2003025009A	2003-01-28

Other References: