PRODUCTION METHOD OF HIGH-STRENGTH STEEL SHEET

Japanese Patent JP2015214732

A

PROBLEM TO BE SOLVED: To provide a production method of a high-strength steel sheet which is improved in productivity by softening a hot rolled steel strip uniformly to alleviate the load in cold rolling and allows production of a high-strength steel sheet in a high yield.SOLUTION: A production method of a high-strength steel sheet comprises taking up a hot rolled steel strip on the outlet side of a hot rolling step as a hot rolled coil, subjecting the hot rolled steel strip supplied continuously from the hot rolled coil in an acid cleaning step to acid cleaning and taking up again as an acid-cleaned coil, subjecting the hot rolled steel strip supplied continuously from the acid-cleaned coil in a heat treatment step to a heat treatment of heating at 500-750°C and taking up again as a heat-treated coil, keeping the heat-treated coil in a specified temperature range for 10-600 min in a temperature retention step and cooling to room temperature and subjecting the hot rolled steel strip supplied continuously from the heat-treated coil to cold rolling in a cold rolling step and taking up a high-strength steel sheet of a specified sheet thickness as a cold-rolled coil.

KIMURA YUKIO
MATSUBARA YUKIHIRO
TAKAHASHI HIDEYUKI
DEN AYAKO
OKAZAKI TOSHIRO
NAKADA NAOKI

JP2014098679A

December 03, 2015

May 12, 2014

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JFE STEEL CORP

C21D9/46; B21B1/22; B21B1/26; C21D1/00; C21D1/26; C21D1/42; C21D1/74; C21D9/56

JP2013076162A	2013-04-25
JP2001200316A	2001-07-24
JP2010144243A	2010-07-01
JP2001200315A	2001-07-24
JP2007239097A	2007-09-20
JP2012139719A	2012-07-26
JPS60125329A	1985-07-04
JPS61174323A	1986-08-06
JP2001071018A	2001-03-21

WO2013125400A1

2013-08-29

Kenichiro Ochiai

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