Title:
HOT ROLLED STEEL SHEET HAVING EXCELLENT CRASHWORTHINESS AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2022/065772
Kind Code:
A1
Abstract:
Provided are a hot rolled steel sheet having excellent crashworthiness and a method for manufacturing same. The hot rolled steel sheet of the present invention contains, in weight%, 0.05-0.13% of carbon (C), 0.2-2.0% of silicon (Si), 1.3-3.0% of manganese (Mn), 0.01-0.1% of aluminum (Al), 0.001-0.05% of phosphor (P), 0.001-0.05% of sulfur (S), 0.001-0.02% of nitrogen (N), and the balance being Fe and other inevitable impurities, and has a steel microstructure comprising, in area%, 55% or more of bainitic ferrite, 10% or more of a martensite/austenite composite phase (MA), the sum of the bainitic ferrite and the martensite/austenite composite phase (MA) being 95% or more, and the remaining total being less than 5% of granular ferrite, retained austenite, and carbides.
Inventors:
SONG TAE-JIN (KR)
KIM SUNG-IL (KR)
CHOI CHANG-SIK (KR)
KIM SUNG-IL (KR)
CHOI CHANG-SIK (KR)
Application Number:
PCT/KR2021/012411
Publication Date:
March 31, 2022
Filing Date:
September 13, 2021
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/60; C21D8/02; C22C38/00; C22C38/02; C22C38/04; C22C38/06; C22C38/22; C22C38/26; C22C38/28; C23C2/06
Foreign References:
| KR101980471B1 | 2019-05-21 | |||
| KR20060072196A | 2006-06-28 | |||
| JP5903880B2 | 2016-04-13 | |||
| KR20090070484A | 2009-07-01 | |||
| KR101758003B1 | 2017-07-13 | |||
| KR20120011475A | 2012-02-08 | |||
| JP2008255484A | 2008-10-23 | |||
| KR20200047625A | 2020-05-07 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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