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Title:
COLD-ROLLED STEEL SHEET HAVING EXCELLENT STRENGTH AND ELONGATION AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2023/121194
Kind Code:
A1
Abstract:
A cold-rolled steel sheet having improved strength and elongation, according to one embodiment of the present invention, comprises, in weight%: 0.04-0.08% of C; 0.05% or less (excluding 0%) of Si; 0.1-0.6% of Mn; 0.02-0.06% of Al; 0.015% or less (excluding 0%) of P; 0.015% or less (excluding 0%) of S; 0.006% or less (excluding 0%) of N; 0.02-0.04% of Nb; and the remainder of Fe and other inevitable impurities, wherein the cold-rolled steel sheet has a component reinforcement index defined by expression 1 of 470 or less, a crystal grain aspect ratio defined by expression 2 of 2.15 or less, and a composite reinforcement index defined by expression 3 of 500 to 600.

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Inventors:
JO MINHO (KR)
HONG YOUNG-KWANG (KR)
Application Number:
PCT/KR2022/020758
Publication Date:
June 29, 2023
Filing Date:
December 19, 2022
Export Citation:
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Assignee:
POSCO CO LTD (KR)
International Classes:
C22C38/04; C21D8/02; C22C38/00; C22C38/02; C22C38/06; C22C38/12; C23C2/06
Foreign References:
KR20000034959A2000-06-26
KR20020072646A2002-09-18
JP2007291457A2007-11-08
KR20030035697A2003-05-09
KR20130002419A2013-01-08
Attorney, Agent or Firm:
YOU ME PATENT AND LAW FIRM (KR)
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