HIGH-STRENGTH ZINC-PLATED STEEL SHEET AND HIGH-STRENGTH STEEL SHEET HAVING SUPERIOR MOLDABILITY, AND METHOD FOR PRODUCING EACH

WIPO Patent Application WO/2013/018723

A1

This high-strength steel sheet having superior moldability while securing the high strength of a maximum tensile strength of at least 900 MPa is characterized by having a predetermined component composition, the steel sheet structure containing a ferrite phase and an austenite phase, the ratio of bcc iron and unaligned Cu grains being at least 15% of the Cu grains overall, the Cu grain density in the ferrite phase being at least 1.0 × 1018 grains/m3, and the average grain size of the Cu grains in the ferrite phase being at least 2.0 nm.

KAWATA HIROYUKI (JP)
MARUYAMA NAOKI (JP)
MURASATO AKINOBU (JP)
MINAMI AKINOBU (JP)
AZUMA MASAFUMI (JP)
KUWAYAMA TAKUYA (JP)
YONEMURA SHIGERU (JP)

PCT/JP2012/069226

February 07, 2013

July 27, 2012

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NIPPON STEEL & SUMITOMO METAL CORP (JP)
KAWATA HIROYUKI (JP)
MARUYAMA NAOKI (JP)
MURASATO AKINOBU (JP)
MINAMI AKINOBU (JP)
AZUMA MASAFUMI (JP)
KUWAYAMA TAKUYA (JP)
YONEMURA SHIGERU (JP)

C22C38/00; B21B3/00; C21D9/46; C22C38/58; C23C2/02; C23C2/06; C23C2/28; C23C2/40; C25D5/26; C25D5/36; C25D7/06

JP2005307246A	2005-11-04
JP2011111671A	2011-06-09
JP2011111673A	2011-06-09
JP2004100018A	2004-04-02
JP2001355044A	2001-12-25
JPH11279690A	1999-10-12
JPH11199973A	1999-07-27
JPH08311601A	1996-11-26
JPH08199288A	1996-08-06
JPH05271857A	1993-10-19

See also references of EP 2738275A4

AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)

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