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Title:
AUSTENITIC STEEL HAVING SUPERIOR MACHINABILITY AND CRYOGENIC TEMPERATURE TOUGHNESS IN WELD HEAT AFFECTED ZONES THEREOF AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2013/100614
Kind Code:
A1
Abstract:
Provided are austenitic steel having superior machinability and cryogenic temperature toughness in weld heat affected zones thereof and a method for manufacturing the same, the austenitic steel comprising, in weight %, 15 to 35% of manganese (Mn), carbon(C) that satisfies 23.6C+Mn ≥ 28 and 33.5C-Mn ≤ 23, 5% or lower (but not 0%) of copper (Cu), chrome (Cr) that satisfies 28.5C+4.4Cr ≤ 57 (but not 0%), the remainder being Fe and other inevitable impurities, the Charpy impact value of the weld heat affected zones at -196˚C being 41J or higher. According to the present invention, austenitic steel having superior machinability and cryogenic temperature toughness in weld heat affected zones thereof is provided in which the cryogenic steel is obtained in an inexpensive manner, a stable austenite phase can be formed at a low temperature and the generation of carbide can be effectively inhibited.

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Inventors:
LEE SOON-GI (KR)
CHOI JONG-KYO (KR)
PARK YOUNG-HWAN (KR)
NOH HEE-GOON (KR)
CHO HYUN-KWAN (KR)
SUH IN-SHIK (KR)
PARK IN-GYU (KR)
LEE HONG-JU (KR)
Application Number:
PCT/KR2012/011537
Publication Date:
July 04, 2013
Filing Date:
December 27, 2012
Export Citation:
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Assignee:
POSCO (KR)
International Classes:
C22C38/00; B23K31/02; C21D9/50; C22C38/38
Domestic Patent References:
WO2007080646A12007-07-19
Foreign References:
JP2011246817A2011-12-08
KR940007374B11994-08-16
KR101004268B12011-01-03
KR20100084570A2010-07-26
JP2005232513A2005-09-02
KR19980058369A1998-09-25
US4257808A1981-03-24
KR970043149A1997-07-26
KR910012277A1991-08-07
JP2007126715A2007-05-24
Other References:
See also references of EP 2799571A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (Daelim Acrotel13 Eonju-ro 30-gil,Gangnam-gu, Seoul 135-971, KR)
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Claims:



 
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