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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 10655196 B1

PDFFull Text
Date of Patent:
May. 19, 2020

Filed:

Dec. 27, 2012

Austenitic steel having excellent machinability and ultra-low temperature toughness in weld heat-affected zone, and method of manufacturing the same

Applicant:

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

Inventors:

Soon-Gi Lee, Pohang-si, KR;

Jong-Kyo Choi, Pohang-si, KR;

Young-Hwan Park, Pohang-si, KR;

Hee-Goon Noh, Pohang-si, KR;

Hyun-Kwan Cho, Pohang-si, KR;

In-Shik Suh, Pohang-si, KR;

In-Gyu Park, Pohang-si, KR;

Hong-Ju Lee, Pohang-si, KR;

Assignee:

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

Attorney:

Cantor Colburn LLP

Primary Examiner:

Weiping Zhu

Int. Cl.
CPC ...
C21D 9/50 (2006.01); C22C 38/00 (2006.01); C22C 38/38 (2006.01); C21D 6/00 (2006.01); C22C 38/28 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/20 (2006.01); C22C 38/60 (2006.01); C22C 38/04 (2006.01); B23K 31/02 (2006.01); B23K 35/30 (2006.01); B23K 101/00 (2006.01); C21D 9/46 (2006.01);
U.S. Cl.
CPC ...
C21D 9/505 (2013.01); B23K 31/02 (2013.01); B23K 35/3073 (2013.01); C21D 6/005 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/04 (2013.01); C22C 38/20 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/38 (2013.01); C22C 38/60 (2013.01); B23K 2101/00 (2018.08); C21D 9/46 (2013.01);
Abstract

Provided are an austenitic steel having excellent machinability and ultra-low temperature toughness in a weld heat-affected zone including 15 wt % to 35 wt % of manganese (Mn), carbon (C) satisfying 23.6C+Mn≥28 and 33.5C−Mn≤23, 5 wt % or less (excluding 0 wt %) of copper (Cu), chromium (Cr) satisfying 28.5C+4.4Cr≤57 (excluding 0 wt %), and iron (Fe) as well as other unavoidable impurities as a remainder, wherein a Charpy impact value of a weld heat-affected zone at −196° C. is 41 J or more, and a method of manufacturing the steel. According to the present invention, a low-cost ultra-low temperature steel may be obtained, a stable austenite phase may be formed at low temperature, carbide formation may be effectively suppressed, and a structural steel having excellent machinability and ultra-low temperature toughness in a weld heat-affected zone may be provided.

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