Title:
ULTRAHIGH-STRENGTH STEEL SHEET AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2024/071522
Kind Code:
A1
Abstract:
The present invention provides an ultrahigh-strength steel sheet, which comprises, by weight%, 0.1% to 0.30% of carbon (C), 1.0% to 2.0% of silicon (Si), 1.5% to 3.0% of magnesium (Mg), 0% (exclusive) to 0.05% of aluminum (Al), 0% (exclusive) to 0.05% of the sum of any one or more selected from niobium (Nb), titanium (Ti) and vanadium (V), 0% (exclusive) to 0.02% of phosphorus (P), 0% (exclusive) to 0.005% of sulfur (S), 0% (exclusive) to 0.006% of nitrogen (N), and the balance being iron (Fe) and unavoidable impurities and has a final microstructure composed of tempered martensite, martensite, pearlite, and retained austenite, with a yield point (YP) of 850 Mpa or higher, a tensile strength (TS) of 1180 MPa or higher, and an elongation index (EI) of 14% or more.
Inventors:
UM HO YONG (KR)
KIM RO SA (KR)
KIM KYEONG MIN (KR)
MAENG HAN SOL (KR)
LEE SANG WOOK (KR)
HAN SEONG KYUNG (KR)
KIM RO SA (KR)
KIM KYEONG MIN (KR)
MAENG HAN SOL (KR)
LEE SANG WOOK (KR)
HAN SEONG KYUNG (KR)
Application Number:
PCT/KR2022/019631
Publication Date:
April 04, 2024
Filing Date:
December 05, 2022
Export Citation:
Assignee:
HYUNDAI STEEL CO (KR)
International Classes:
C22C38/04; C21D8/02; C22C38/00; C22C38/02; C22C38/06; C22C38/12; C22C38/14
Foreign References:
| KR20220072921A | 2022-06-03 | |||
| KR20190123551A | 2019-11-01 | |||
| KR20140068222A | 2014-06-05 | |||
| JP2008291304A | 2008-12-04 | |||
| KR20220071035A | 2022-05-31 |
Attorney, Agent or Firm:
LEE, In Haeng et al. (KR)
Download PDF: