HIGH-STRENGTH STEEL SHEET HAVING SUPERIOR IMPACT RESISTANCE, METHOD FOR PRODUCING SAME, HIGH-STRENGTH GALVANIZED STEEL SHEET, AND METHOD FOR PRODUCING SAME

WIPO Patent Application WO/2013/018740

A1

This high-strength steel sheet, which has superior impact resistance and a maximum tensile strength of at least 900 MPa has a steel sheet structure containing C, Si, Mn, P, S, Al, Ti, N, and O in predetermined quantities, the remainder comprising iron and unavoidable impurities; 1-8% by volume fraction of residual austenite is contained in the 1/8-3/8 thickness range centered on 1/4 of the sheet thickness; the average aspect ratio of the residual austenite is no greater than 2.0; the amount of solid-solution Mn in the residual austenite is at least 1.1 times the average amount of Mn; TiN grains having an average grain size of no greater than 0.5 μm are contained; and the density of AlN grains having an average grain size of at least 1 μm is no greater than 1.0 grains/mm2

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KAWATA HIROYUKI (JP)
MARUYAMA NAOKI (JP)
MURASATO AKINOBU (JP)
MINAMI AKINOBU (JP)
HASEGAWA HAJIME (JP)
WAKABAYASHI CHISATO (JP)
OKI TSUYOSHI (JP)

PCT/JP2012/069261

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)
HASEGAWA HAJIME (JP)
WAKABAYASHI CHISATO (JP)
OKI TSUYOSHI (JP)

C22C38/00; C21D9/46; C22C38/14; C22C38/58; C23C2/02; C23C2/06; C23C2/28; C23C28/00; C25D5/26

JP2011111672A	2011-06-09
JP2010202949A	2010-09-16
JP2008274355A	2008-11-13
JP2012172203A	2012-09-10
JP2001011565A	2001-01-16
JP2002294400A	2002-10-09
JP2004300452A	2004-10-28
JP2006307327A	2006-11-09
JP2009068039A	2009-04-02
JPH10130776A	1998-05-19
JPH1121653A	1999-01-26

See also references of EP 2740812A4

HAGIWARA, Yasushi et al. (JP)
Yasushi Hagiwara (JP)

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