Title:
HIGH-STRENGTH STRUCTURAL STEEL HAVING EXCELLENT COLD BENDABILITY, AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2020/130436
Kind Code:
A3
Abstract:
A high-strength structural steel having excellent cold bendability, according to one embodiment of the present invention, comprises, by wt%, 0.02-0.1% of C, 0.01-0.6% of Si, 1.7-2.5% of Mn, 0.005-0.5% of Al, 0.02% or less of P, 0.01% or less of S, 0.0015-0.015% of N, and the balance of Fe and other inevitable impurities, wherein an outer surface layer part and an inner central part thereof are microstructurally divided in a thickness direction, the surface layer part can comprise tempered austenite as a matrix structure, and the central part can comprise bainitic ferrite as a matrix structure.
Inventors:
CHO JAE-YOUNG (KR)
YI IL-CHEOL (KR)
KANG SANG-DEOK (KR)
YI IL-CHEOL (KR)
KANG SANG-DEOK (KR)
Application Number:
PCT/KR2019/017148
Publication Date:
September 03, 2020
Filing Date:
December 06, 2019
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/04; C21D8/02; C22C38/00; C22C38/02; C22C38/06; C22C38/08; C22C38/12; C22C38/14; C22C38/16; C22C38/18
Foreign References:
| KR20150122779A | 2015-11-02 | |||
| KR100833076B1 | 2008-05-27 | |||
| KR101819356B1 | 2018-01-17 | |||
| KR960009174B1 | 1996-07-16 | |||
| JP2010126808A | 2010-06-10 | |||
| KR20190077183A | 2019-07-03 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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