Title:
COLD ROLLED STEEL SHEET HAVING EXCELLENT AGING RESISTANCE AND WORKABILITY, AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2019/132372
Kind Code:
A1
Abstract:
A cold rolled steel sheet having excellent aging resistance and workability, according to one embodiment of the present invention, comprises, by wt%, 0.1% or less of C, 0.5% or less of Si, 0.1-0.5% of Mn, 0.015-0.1% of Al, 0.01% or less of P, 0.01% or less of S, 0.01% or less of N, 0.005% or less of Nb, 0.005% or less of Ti, 0.005% or less of V, and the balance of Fe and other inevitable impurities, wherein the total amounts of C and N in grains can meet the following relation 1, and the amounts of solid-solute C and N in the grains can meet the following relation 2.
[Relation 1] ([C]/12.01 + [N]/14.01) x 105 ≥ 10
[Relation 2] ([C]/12.01 + [N]/14.01) x 105 ≤ 5
In relation 1 and relation 2, [C] and [N] are respectively the amounts of C and N and mean wt%.
Inventors:
JO MIN-HO (KR)
HONG YOUNG-KWANG (KR)
HONG YOUNG-KWANG (KR)
Application Number:
PCT/KR2018/016118
Publication Date:
July 04, 2019
Filing Date:
December 18, 2018
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/00; C21D8/02; C21D9/52; C22C38/02; C22C38/04
Foreign References:
| JP2010265545A | 2010-11-25 | |||
| KR101523966B1 | 2015-05-29 | |||
| KR101037871B1 | 2011-05-31 | |||
| US20040112483A1 | 2004-06-17 | |||
| KR101607041B1 | 2016-03-28 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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