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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 10041156 B1

PDFFull Text
Date of Patent:
Aug. 07, 2018

Filed:

Dec. 24, 2013

High strength austenitic-based steel with remarkable toughness of welding heat-affected zone and preparation method therefor

Applicant:

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

Inventors:

Hak-Cheol Lee, Pohang-si, KR;

In-Shik Suh, Pohang-si, KR;

Soon-Gi Lee, Pohang-si, KR;

In-Gyu Park, Pohang-si, KR;

Yong-Jin Kim, Pohang-si, KR;

Hong-Ju Lee, Pohang-si, KR;

Assignee:

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

Attorney:

McDermott Will & Emery LLP

Primary Examiner:

George Wyszomierski

Assistant Examiner:

Tima M McGuthry Banks

Int. Cl.
CPC ...
C21D 6/00 (2006.01); C21D 8/00 (2006.01); C22C 38/04 (2006.01); C22C 38/22 (2006.01); C22C 38/32 (2006.01); C22C 38/00 (2006.01); C22C 38/20 (2006.01); C21D 8/02 (2006.01); C21D 8/04 (2006.01); C22C 38/38 (2006.01); C22C 38/28 (2006.01);
U.S. Cl.
CPC ...
C22C 38/001 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 8/005 (2013.01); C21D 8/0226 (2013.01); C21D 8/0426 (2013.01); C22C 38/00 (2013.01); C22C 38/04 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/38 (2013.01);
Abstract

The present invention relates to a high strength austenitic-based steel with remarkable toughness of a welding heat-affected zone and a preparation method therefor. One embodiment of the present invention provides: a high strength austenitic-based steel with remarkable toughness of a welding heat-affected zone, comprising 0.8-1.5 wt % of C, 15-22 wt % of Mn, 5 wt % or less of Cr (except 0), and the balance of Fe and other inevitable impurities, and further comprising at least one of the following (a) and (b), wherein the microstructure of a welding heat-affected zone comprises 90% or more of austenite by volume fraction; and a preparation method therefor. (a) Mo: 0.1-1% and B: 0.001-0.02% (b) Ti: 0.01-0.3% and N: 0.003-0.1%.

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