Title:
ULTRA-HIGH STRENGTH COLD-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2024/058312
Kind Code:
A1
Abstract:
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), 0-0.02 wt% (exclusive of 0) of phosphorus (P), 0-0.005 wt% (exclusive of 0) of sulfur (S), 0.01-0.05 wt% of aluminum (Al), 0-0.8 wt% (exclusive of 0) of chromium (Cr), 0-0.4 wt% (exclusive of 0) of molybdenum (Mo), 0.01-0.1 wt% of titanium (Ti), 0-0.3 wt% (exclusive of 0) of vanadium (V), and 0.001-0.005 wt% of boron (B), with the balance being iron (Fe) and other inevitable impurities, wherein the final microstructure of the cold-rolled steel sheet includes cementite, transition carbides, and fine precipitates, the transition carbides including ε-carbide, in which the atomic ratio of a substitutional element, which is one of Fe, Mn, Cr, or Mo, to carbon is 2.5:1, or η-carbide, in which the atomic ratio is 2:1.
Inventors:
PARK BONG JUNE (KR)
NOH HYUN SEONG (KR)
LA JOUNG HYUN (KR)
PARK MIN SUH (KR)
JANG MIN HO (KR)
HAN SEONG KYUNG (KR)
NOH HYUN SEONG (KR)
LA JOUNG HYUN (KR)
PARK MIN SUH (KR)
JANG MIN HO (KR)
HAN SEONG KYUNG (KR)
Application Number:
PCT/KR2022/019585
Publication Date:
March 21, 2024
Filing Date:
December 05, 2022
Export Citation:
Assignee:
HYUNDAI STEEL CO (KR)
International Classes:
C22C38/38; C21D8/02; C21D9/46; C22C38/06; C22C38/22; C22C38/24; C22C38/28; C22C38/32
Foreign References:
| KR20210147255A | 2021-12-07 | |||
| KR20190028750A | 2019-03-19 | |||
| KR20210123371A | 2021-10-13 | |||
| KR20100116608A | 2010-11-01 | |||
| JP2004068050A | 2004-03-04 |
Attorney, Agent or Firm:
LEE, In Haeng et al. (KR)
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