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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9856542 B1

PDFFull Text
Date of Patent:
Jan. 02, 2018

Filed:

Dec. 26, 2012

Ferritic lightweight high-strength steel sheet having excellent stiffness and ductility, and method of manufacturing the same

Applicant:

Posco, Pohang-si, KR;

Inventors:

Jai-Hyun Kwak, Gwangyang-si, KR;

Kyoo-Young Lee, Gwangyang-si, KR;

Kwang-Geun Chin, Gwangyang-si, KR;

Assignee:

POSCO, Pohang-si, KR;

Attorney:

The Webb Law Firm

Primary Examiner:

Deborah Yee

Int. Cl.
CPC ...
C22C 38/04 (2006.01); C22C 38/02 (2006.01); C22C 38/14 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C21D 8/00 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); C22C 38/60 (2006.01); C23C 2/02 (2006.01); C23C 2/06 (2006.01); B21B 1/26 (2006.01); B21B 1/28 (2006.01); B21C 47/02 (2006.01); B32B 15/01 (2006.01); C21D 6/00 (2006.01); C23C 30/00 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); B21B 1/26 (2013.01); B21B 1/28 (2013.01); B21C 47/02 (2013.01); B32B 15/012 (2013.01); B32B 15/013 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/00 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0263 (2013.01); C21D 8/0273 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/004 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/14 (2013.01); C22C 38/60 (2013.01); C23C 2/02 (2013.01); C23C 2/06 (2013.01); C23C 30/005 (2013.01); C21D 2211/004 (2013.01); C21D 2211/005 (2013.01); Y02P 10/212 (2015.11); Y10T 428/12778 (2015.01); Y10T 428/12972 (2015.01);
Abstract

Provided is a ferritic lightweight high-strength steel sheet having excellent stiffness and ductility and a method of manufacturing the same. The steel sheet including 0.02 wt % to 0.1 wt % of carbon (C), 4 wt % to 15 wt % of manganese (Mn), 4 wt % to 10 wt % of aluminum (Al), 2.0 wt % or less (excluding 0) of silicon (Si), 0.01 wt % to 0.3 wt % of titanium (Ti), 0.005 wt % to 0.2 wt % of antimony (Sb), and iron (Fe) as well as unavoidable impurities as a remainder, and having a value of 0.25×Ti/C ranging from 0.17 to 1.0 and a value of Mn/Al×Log(C×Ti×10000) ranging from 1.0 to 10.

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