Title:
HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2023/090735
Kind Code:
A1
Abstract:
An embodiment of the present invention provides a hot-rolled steel sheet comprising, by wt%, 0.06-0.12% of C, 0.004-0.4% of Si, 0.8-2.0% of Mn, 0.01-0.05% of Al, 0.05-1.0% of Cr, 0.001-0.3% of Mo, 0.001-0.05% of P, 0.001-0.005% of S, 0.001-0.01% of N, 0.001-0.05% of Nb, 0.001-0.05% of Ti, 0.001-0.005% of B, and the remainder of Fe and other inevitable impurities, satisfying relational formula 1 below, and having a microstructure including, by area%, at least one from among 5-15% of austenite, 80% or more of auto-tempered martensite, and the remainder of bainite and ferrite. [Relational formula 1] (10[C]+[Si]+2.5[Mn])/(1.5[Cr]+2.0[Mo]-3.2[Nb]) ≤ 20
Inventors:
YI IL-CHEOL (KR)
KIM SUNG-IL (KR)
KIM SUNG-IL (KR)
Application Number:
PCT/KR2022/017335
Publication Date:
May 25, 2023
Filing Date:
November 07, 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; C22C38/58
Foreign References:
| KR20140072180A | 2014-06-12 | |||
| JP6787532B2 | 2020-11-18 | |||
| KR101617115B1 | 2016-04-29 | |||
| KR20200075959A | 2020-06-29 | |||
| JP2015190015A | 2015-11-02 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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