Title:
COLD ROLLED STEEL SHEET HAVING EXCELLENT YIELD STRENGTH AND DRAWING FORMABILITY AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2019/066327
Kind Code:
A1
Abstract:
The present invention relates to a cold rolled steel sheet having excellent yield strength and drawing formability and a manufacturing method therefor. An embodiment of the present invention provides: a cold rolled steel sheet having excellent yield strength and drawing formability, the cold rolled steel sheet containing, in wt%, 0.3-0.8% of C, 13-25% of Mn, 0.2-0.8% of V, 0.03% or less of V, 0.03% or less of S, 0.04% or less of N, and the balance Fe and inevitable impurities, the cold rolled steel sheet comprising 30 area% or more of recrystallized microstructures having a size of 3 μm or smaller and 30-70 area% of non-recrystallized microstructures; and a manufacturing method therefor.
Inventors:
SONG TAE-JIN (KR)
SUH IN-SHIK (KR)
SUH IN-SHIK (KR)
Application Number:
PCT/KR2018/010762
Publication Date:
April 04, 2019
Filing Date:
September 13, 2018
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/04; C21D8/02; C21D9/46; C22C38/02; C22C38/06; C22C38/12; C22C38/14; C23G1/08
Foreign References:
| KR20160078840A | 2016-07-05 | |||
| KR20150075324A | 2015-07-03 | |||
| KR20100071619A | 2010-06-29 | |||
| KR20080060982A | 2008-07-02 | |||
| KR20120065464A | 2012-06-21 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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