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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 10144986 B1

PDFFull Text
Date of Patent:
Dec. 04, 2018

Filed:

Aug. 14, 2013

Ultrahigh-strength steel sheet and manufacturing method therefor

Applicant:

Posco, Pohang-si, Gyeongsangbuk-do, KR;

Inventors:

Sung-Kyu Kim, Gwangyang-si, KR;

Won-Tae Cho, Gwangyang-si, KR;

Tai-Ho Kim, Gwangyang-si, KR;

Kwang-Geun Chin, Gwangyang-si, KR;

Sang-Ho Han, Gwangyang-si, KR;

Assignee:

POSCO, Pohang-si, Gyeongsangbuk-do, KR;

Attorney:

McDermott Will & Emery LLP

Primary Examiner:

Scott R Kastler

Int. Cl.
CPC ...
C22C 38/00 (2006.01); C21D 9/46 (2006.01); C21D 8/02 (2006.01); C22C 38/58 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/54 (2006.01); C21D 6/00 (2006.01); B21B 3/02 (2006.01); C22C 38/50 (2006.01); C22C 38/40 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); B21B 3/02 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 8/02 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0263 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/40 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C22C 38/58 (2013.01); C21D 2211/001 (2013.01);
Abstract

The present invention relates to an ultrahigh-strength steel sheet and a manufacturing method therefor. More specifically, the present invention can provide an ultra-high strength steel sheet which can ensure weldability and a delayed fracture resistance property by controlling the contents of elements affecting platability along with the contents of austenite-stabilizing elements and increasing twin formation through re-rolling, and simultaneously improve impact characteristics and workability by ensuring excellent yield strength and ductility.

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