Title:
STEEL SHEET HAVING HIGH STRENGTH AND HIGH FORMABILITY AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2021/066274
Kind Code:
A1
Abstract:
A steel sheet having high strength and high formability according to an aspect of the present invention comprises, by wt%, 0.05-0.15% of carbon (C), greater than 0 and 0.4% or less of silicon (Si), 4.0-9.0% of manganese (Mn), greater than 0 and 0.3% or less of aluminum (Al), 0.02% or less of phosphorus (P), 0.005% or less of sulfur (S), 0.006% or less of nitrogen (N), and the remainder of iron (Fe) and other inevitable impurities. The steel sheet has a microstructure consisting of ferrite and residual austenite. The grain size of the microstructure is 3 µm or less. The steel sheet has a yield strength (YS) of 800 MPa or more, a tensile strength (TS) of 980 Mpa or more, an elongation (EL) of 25% or more, and a hole expansion ratio (HER) of 20% or more.
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Inventors:
UM HO YONG (KR)
GOO NAM HOON (KR)
KIM MIN SUNG (KR)
OH GYU JIN (KR)
GOO NAM HOON (KR)
KIM MIN SUNG (KR)
OH GYU JIN (KR)
Application Number:
PCT/KR2020/006385
Publication Date:
April 08, 2021
Filing Date:
May 15, 2020
Export Citation:
Assignee:
HYUNDAI STEEL CO (KR)
International Classes:
C22C38/04; C22C38/12; C22C38/14
Foreign References:
| KR101977491B1 | 2019-05-10 | |||
| KR101677396B1 | 2016-11-18 | |||
| KR20150097722A | 2015-08-26 | |||
| KR20130046968A | 2013-05-08 | |||
| JP2003253331A | 2003-09-10 |
Attorney, Agent or Firm:
AJU INTERNATIONAL LAW & PATENT GROUP (KR)
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