Title:
COLD-ROLLED STEEL SHEET AND GALVANIZED STEEL SHEET WITH EXCELLENT PRESS FORMABILITY AND METHOD OF MANUFACTURING THEREOF
Document Type and Number:
WIPO Patent Application WO/2023/113558
Kind Code:
A1
Abstract:
A cold-rolled steel sheet, according to one embodiment of the present invention, may comprise in percentage by weight: carbon (C): 0.010-0.025%; manganese (Mn): 0.10-0.25%; sulfur (S): 0.002-0.011%; boron (B): 0.0006-0.0026%; nitrogen (N): 0.0010-0.0034%; aluminum (Al): 0.006-0.028%; and the balance being Fe and unavoidable impurities, and may comprise precipitates of at least one of MnS and BN, wherein the average particle diameter of the precipitates may be 40-250 nm, the area fraction of the precipitates in the cold-rolled steel sheet may be 1-10%, and the yield strength may be 150-220 MPa.
Inventors:
LEE BYOUNG HO (KR)
Application Number:
PCT/KR2022/020640
Publication Date:
June 22, 2023
Filing Date:
December 16, 2022
Export Citation:
Assignee:
POSCO CO LTD (KR)
International Classes:
C22C38/04; B21C47/02; C21D8/02; C22C38/00; C22C38/06; C22C38/60; C23C2/06
Domestic Patent References:
| WO2015037787A1 | 2015-03-19 |
Foreign References:
| KR20000034959A | 2000-06-26 | |||
| KR20130070684A | 2013-06-28 | |||
| JP2003321732A | 2003-11-14 | |||
| KR20090122366A | 2009-11-27 |
Attorney, Agent or Firm:
YOU ME PATENT AND LAW FIRM (KR)
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