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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 9738958 B1

PDFFull Text
Date of Patent:
Aug. 22, 2017

Filed:

Dec. 12, 2011

Austenitic, lightweight, high-strength steel sheet having high yield ratio and ductility, and method for producing the same

Applicants:

Kwang-geun Chin, Gwangyang-si, KR;

Sang-ho Han, Gwangyang-si, KR;

Jai-hyun Kwak, Gwangyang-si, KR;

Inventors:

Kwang-Geun Chin, Gwangyang-si, KR;

Sang-Ho Han, Gwangyang-si, KR;

Jai-Hyun Kwak, Gwangyang-si, KR;

Assignee:

POSCO, Pohang-si, KR;

Attorney:

The Webb Law Firm

Primary Examiner:

Scott Kastler

Assistant Examiner:

Vanessa Luk

Int. Cl.
CPC ...
C22C 38/04 (2006.01); C22C 38/58 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/14 (2006.01); C23C 30/00 (2006.01); C23C 2/02 (2006.01); C23C 2/28 (2006.01); B21D 17/04 (2006.01); B32B 15/01 (2006.01); C22C 38/12 (2006.01); C22C 38/20 (2006.01); C22C 38/28 (2006.01); C22C 38/38 (2006.01); C22C 38/44 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01);
U.S. Cl.
CPC ...
C22C 38/58 (2013.01); B21D 17/04 (2013.01); B32B 15/01 (2013.01); B32B 15/012 (2013.01); C21D 8/02 (2013.01); C21D 8/0205 (2013.01); C21D 8/0247 (2013.01); C21D 8/0273 (2013.01); C21D 8/0284 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/20 (2013.01); C22C 38/28 (2013.01); C22C 38/38 (2013.01); C22C 38/44 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C23C 2/02 (2013.01); C23C 2/28 (2013.01); C23C 30/00 (2013.01); C21D 2211/001 (2013.01); Y10T 428/12757 (2015.01); Y10T 428/12799 (2015.01);
Abstract

Provided is an austenitic, lightweight, high-strength steel sheet having a high yield ratio and ductility and a method for producing the same, and more particularly, to a high-strength steel sheet for automotive interior panels, exterior panels, and structural parts, and a method for producing the steel sheet. The steel sheet may be a hot-rolled steel sheet, a cold-rolled steel sheet, or a plated steel sheet. The steel sheet includes, by weight %, C: 0.6% to 1.0%, Si: 0.1% to 2.5%, Mn: 10% to 15%, P: 0.02% or less, S: 0.015% or less, Al: 5% to 8%, Ti: 0.01% to 0.20%, N: 0.02% or less, and the balance of Fe and inevitable impurities, wherein the steel sheet has a specific gravity of 7.4 g/cmand a Mn/Al ratio of 2 to 3.

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