Title:
COLD-ROLLED STEEL SHEET WITH EXCELLENT WELDABILITY AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2023/113532
Kind Code:
A1
Abstract:
The present invention relates to a cold-rolled steel sheet and a method for manufacturing same. A cold-rolled steel sheet according to one embodiment comprises, in weight%, 0.01-0.05 % of carbon (C), 0.6-1.2 % of manganese (Mn), 0.05 % or less (excluding 0 %) of silicon (Si), 0.0005-0.01 % of phosphorus (P), 0.008 % or less (excluding 0 %) of sulfur (S), 0.0005-0.015 % of aluminum (Al), 0.0005-0.003 % of nitrogen (N), 0.1-0.4 % of tungsten (W), 1.0-2.0 % of chromium (Cr), 0.05-0.15 % of zirconium (Zr), and the remainder of Fe and inevitable impurities, wherein the yield strength of a welded member may be 500 MPa or more.
Inventors:
KIM JAIIK (KR)
Application Number:
PCT/KR2022/020580
Publication Date:
June 22, 2023
Filing Date:
December 16, 2022
Export Citation:
Assignee:
POSCO CO LTD (KR)
International Classes:
C22C38/22; C21D8/02; C22C38/28
Foreign References:
| KR20020021646A | 2002-03-21 | |||
| JP2013209727A | 2013-10-10 | |||
| KR20180019743A | 2018-02-26 | |||
| KR20130002204A | 2013-01-07 | |||
| KR20180018804A | 2018-02-21 |
Attorney, Agent or Firm:
YOU ME PATENT AND LAW FIRM (KR)
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