Title:
HIGH-STRENGTH STEEL SHEET HAVING EXCELLENT HOLE EXPANDABILITY AND DUCTILITY AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/003188
Kind Code:
A1
Abstract:
The present invention relates to steel suitable as a material for automobiles and, specifically, to a high-strength steel sheet having excellent hole expandability and ductility, and a manufacturing method therefor. The high-strength steel sheet of the present invention has a microstructure comprising a hard phase and a soft phase, wherein a martensite phase, which is the hard phase, is evenly distributed in a recrystallized ferrite matrix through optimized cold-rolling and annealing processes, and a nonequilibrium ferrite phase is introduced at the interface between the hard phase and the soft phase so as to increase the crack resistance during processing.
Inventors:
CHO KYOUNG-RAE (KR)
KIM SUNG-KYU (KR)
PARK JUN-HO (KR)
HAN SANG-HO (KR)
KIM SUNG-KYU (KR)
PARK JUN-HO (KR)
HAN SANG-HO (KR)
Application Number:
PCT/KR2022/008874
Publication Date:
January 26, 2023
Filing Date:
June 22, 2022
Export Citation:
Assignee:
POSCO CO LTD (KR)
International Classes:
C22C38/38; B21C47/02; C21D8/02; C22C38/00; C22C38/22; C22C38/26; C22C38/28; C22C38/32
Foreign References:
| KR20170106414A | 2017-09-20 | |||
| KR20180132889A | 2018-12-12 | |||
| KR20120127733A | 2012-11-23 | |||
| US20110024004A1 | 2011-02-03 | |||
| KR20130032917A | 2013-04-02 | |||
| JP2005264176A | 2005-09-29 | |||
| KR20150073844A | 2015-07-01 | |||
| JP2010090432A | 2010-04-22 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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