Title:
COLD-ROLLED STEEL SHEET FOR STRUCTURAL SECTION HAVING EXCELLENT HARDNESS AND PROCESSABILITY, AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2021/125684
Kind Code:
A1
Abstract:
A cold-rolled steel sheet according to an example of the present invention comprises at most 0.0004 wt% (exclusive of 0 wt%) of C, at most 0.02 wt% (exclusive of 0 wt%) of Si, 0.1 to 0.3 wt% of Mn, at most 0.05 wt% (exclusive of 0 wt%) of Al, at most 0.02 wt% (exclusive of 0 wt%) of P, at most 0.001 wt% (exclusive of 0 wt%)of S, at most 0.004 wt% (exclusive of 0 wt%) of N, 0.015 to 0.035 wt% of Ti, and 0.001 to 0.003 wt% of B, with the balance being Fe and other inevitable impurities, and has a microstructure in which the crystal grain aspect ratio defined by the following equation 1 is 1.4 to 4.0. [Equation 1]: crystal grain aspect ratio = average crystal grain diameter in the rolling direction/average crystal grain diameter in the thickness direction
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Inventors:
JO MINHO (KR)
HONG YOUNG-KWANG (KR)
HONG YOUNG-KWANG (KR)
Application Number:
PCT/KR2020/017977
Publication Date:
June 24, 2021
Filing Date:
December 09, 2020
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/02; B21B1/24; B21B3/00; C21D8/02; C22C38/00; C22C38/04; C22C38/06; C22C38/14; C22C38/48; C22C38/60
Foreign References:
| KR20130101588A | 2013-09-13 | |||
| JPH0892638A | 1996-04-09 | |||
| JPH0881715A | 1996-03-26 | |||
| JPH08176673A | 1996-07-09 | |||
| JPH08127816A | 1996-05-21 |
Attorney, Agent or Firm:
YOU ME PATENT AND LAW FIRM (KR)
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