HIGH-STRENGTH COLD ROLLED STEEL SHEET EXCELLENT IN DEEP DRAWABILITY, METHOD OF MANUFACTURING THE SAME

Japanese Patent JP2012031469

A

To provide a high-strength cold rolled steel sheet excellent in deep drawability, and to provide a method of manufacturing the same.

The high-strength cold rolled steel sheet excellent in deep drawability is characterized in that: it contains, by mass%, 0.03-0.25% C, 0.001-3.0% Si, 0.5-3.0% Mn, 0.001-0.15% P, 0.0005-0.05% S, 0.01-1.0% Al, 0.1-3.0% Cr, 0.0005-0.01% N, and the balance Fe with inevitable impurities; a mother phase is a ferrite phase; other metallographic structure contains one or two or more kinds out of bainite, austenite, martensite, pearlite in volume fraction of 2% or more; X-ray random intensity ratios of sheet faces {111} and {100} at a thickness of 1/2 in the steel sheet are respectively 5.0 or higher, and 3.0 or lower; and an average r value is 1.3 or higher.

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YAMAGUCHI YUJI
OKAMOTO TSUTOMU
SUGIURA NATSUKO
FUJITA NOBUHIRO

JP2010171871A

February 16, 2012

July 30, 2010

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NIPPON STEEL CORP

C22C38/00; C21D9/48; C22C38/60

JP2004052103A	2004-02-19
JP2003064444A	2003-03-05
JP2003064443A	2003-03-05

Atsushi Aoki
Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Nakamura Asayuki
Nagasaka Tomoyasu

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