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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 11299793 B1

PDFFull Text
Date of Patent:
Apr. 12, 2022

Filed:

Jun. 22, 2018

Steel sheet having excellent resistance to liquid metal embrittlement cracks and method for manufacturing the same

Applicant:

Posco, Pohang-si, KR;

Inventors:

Sea-Woong Lee, Gwangyang-si, KR;

Kyoo-Young Lee, Gwangyang-si, KR;

Joo-Hyun Ryu, Gwangyang-si, KR;

Ki-Cheol Kang, Gwangyang-si, KR;

Assignee:

POSCO, Pohang-si, KR;

Attorney:

Cantor Colburn LLP

Primary Examiner:

Scott R Kastler

Int. Cl.
CPC ...
C21D 9/46 (2006.01); C22C 38/04 (2006.01); C21D 1/26 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/38 (2006.01); C23C 2/02 (2006.01); C23C 2/06 (2006.01); C23C 2/12 (2006.01); C23C 2/40 (2006.01); C23C 14/16 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); C21D 1/26 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0263 (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 38/38 (2013.01); C23C 2/02 (2013.01); C23C 2/06 (2013.01); C23C 2/12 (2013.01); C23C 2/40 (2013.01); C23C 14/16 (2013.01); C21D 2211/001 (2013.01); C21D 2211/008 (2013.01);
Abstract

Provided is a steel sheet having excellent resistance to liquid metal embrittlement cracks and a method for manufacturing the same. The steel sheet includes, by weight %, 0.04% to 0.35% of C, 0.99% or less of Al+Si, 3.5% to 10% of Mn, 0.05% or less of P (excluding 0%), 0.02% or less of S (excluding 0%), and 0.02% or less of N (excluding 0%) with a remainder of Fe and other inevitable impurities, wherein the steel sheet comprises a microstructure comprising at least 10% of residual austenite, at least 60% of annealed martensite and 20% or less of alpha martensite and epsilon martensite, by volume fraction, and an average thickness of a Mn-depleted layer is at least 0.5 μm from a product surface.

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