COLD-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME

WIPO Patent Application WO/2024/005283

A1

The present invention provides a cold-rolled steel sheet comprising 0.23-0.35 wt% of carbon (C), 0.05-0.5 wt% of silicon (Si), 0.3-2.3 wt% of manganese (Mn), greater than 0 and less than or equal to 0.02 wt% of phosphorus (P), greater than 0 and less than or equal to 0.005 wt% of sulfur (S), 0.01-0.05 wt% of aluminum (Al), greater than 0 and less than or equal to 0.8 wt% of chromium (Cr), greater than 0 and less than or equal to 0.4 wt% of molybdenum (Mo), 0.01-0.1 wt% of titanium (Ti), 0.001-0.005 wt% of boron (B), and the remainder of iron (Fe) and other inevitable impurities, wherein the final microstructure of the cold-rolled steel sheet includes cementite, transition carbide, and fine precipitates, the transition carbide includes an ε-carbide having an atomic ratio of a substitutional element to carbon of 2.5:1 or a η-carbide having an atomic ratio of a substitutional element to carbon of 2:1, the substitutional element being any one of Fe, Mn, Cr, or Mo, and the fine precipitates have an atomic ratio of an alloying element to carbon of 1:1, the alloying element being any one of Mo or Ti.

PARK BONG JUNE (KR)
NOH HYUN SEONG (KR)
LA JOUNG HYUN (KR)
PARK MIN SUH (KR)
JANG MIN HO (KR)
HAN SEONG KYUNG (KR)

PCT/KR2022/019583

January 04, 2024

December 05, 2022

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HYUNDAI STEEL CO (KR)

C22C38/38; C21D8/02; C21D9/46; C22C38/06; C22C38/22; C22C38/28; C22C38/32

KR20200134397A	2020-12-02
KR20110042369A	2011-04-26
JP2007254887A	2007-10-04
KR20120032326A	2012-04-05
KR20120113588A	2012-10-15

LEE, In Haeng et al. (KR)

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