Title:
COLD ROLLED STEEL SHEET HAVING EXCELLENT PROCESSABILITY, AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2018/117675
Kind Code:
A1
Abstract:
The present invention relates to a cold rolled steel sheet having high temperature characteristics and room temperature processability, and a manufacturing method therefor, and provides a cold rolled steel sheet having excellent processability, and a manufacturing method therefor, the cold rolled steel sheet: comprising, by wt%, 0.0005-0.003% of C, 0.30-0.70% of Mn, 0.02-0.10% of Al, 0.003-0.020% of P, 0.002-0.006% of N, 0.015% or less of S (including 0%), 0.01-0.05% of V, 0.0005-0.0035% of B, 0.04-0.10% of W, and the balance of Fe and other inevitable impurities, wherein the effective atomic ratio [(V*1.2B)/(C+N)] of C and N to V and B is 0.00009-0.00069; comprises a microstructure containing, by area%, 95% or more of polygonal ferrite and 5% or less of acicular ferrite (excluding 0%); and comprises (V,B)(C,N) precipitates having a size of 0.01-0.10 μm.
Inventors:
KIM JAI-IK (KR)
Application Number:
PCT/KR2017/015209
Publication Date:
June 28, 2018
Filing Date:
December 21, 2017
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/00; C21D8/02; C22C38/02; C22C38/06; C22C38/12; C25D3/12
Foreign References:
| JP2015206086A | 2015-11-19 | |||
| KR20160078848A | 2016-07-05 | |||
| KR20080005512A | 2008-01-14 | |||
| KR20110119285A | 2011-11-02 | |||
| JP2005078894A | 2005-03-24 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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