Title:
AUSTENITIC STAINLESS STEEL HAVING CORROSION-RESISTANT ALUMINA OXIDE FILM FORMED THEREON IN LEAD OR LEAD-BISMUTH EUTECTIC, AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/103243
Kind Code:
A1
Abstract:
The present invention provides austenitic stainless steel manufactured using an austenitic stainless steel base material, comprising, by weight%, 13 to 20% of Cr, 16 to 20% of Ni, more than 0 to 2% of Mo, more than 0 to 2% of Mn, more than 0 to 1% of Si, 1 to 4% of Al, 0.1 to 1% of Ti, 0.05 to 0.4% of C, more than 0 to 0.03% of P, and the balance being Fe and impurities. As the present invention provides austenitic stainless steel with corrosion resistance by forming an alumina oxide film thereon as a structural material for lead or lead-bismuth eutectic, it is possible to secure economic feasibility by increasing the integrity and lifespan of nuclear fuel cladding and materials of a nuclear reactor. In addition, the present invention can increase the grain boundary density of austenitic stainless steel with a corrosion-resistant alumina oxide film used as a structural material for lead or lead-bismuth eutectic through a fine TiC precipitation phase. Accordingly, the present invention provides austenitic stainless steel with improved corrosion resistance of an alumina oxide film compared to austenitic stainless steel used as a structural material for conventional lead and lead-bismuth eutectics. Further, the present invention provides austenitic stainless steel with a corrosion-resistant alumina oxide film formed thereon used as a structural material for lead or lead-bismuth eutectic, which improves numerical stability and mechanical strength by reducing swelling due to neutron irradiation through a fine TiC precipitation phase in a nuclear reactor environment. Moreover, the austenitic stainless steel with a corrosion-resistant alumina oxide film formed thereon in lead or lead-bismuth eutectic may be used directly or indirectly in other high-temperature power generation fields due to excellent corrosion resistance thereof in the future.
Inventors:
KIM JIHYUN (KR)
HWANG ILSOON (KR)
KIM TAEYONG (KR)
HWANG ILSOON (KR)
KIM TAEYONG (KR)
Application Number:
PCT/KR2021/016806
Publication Date:
May 19, 2022
Filing Date:
November 16, 2021
Export Citation:
Assignee:
ULSAN NAT INST SCIENCE & TECH UNIST (KR)
International Classes:
C22C38/58; B23K35/30; B23K35/362; C21D8/06; C22C38/50
Foreign References:
| JPH10140296A | 1998-05-26 | |||
| JPH11279714A | 1999-10-12 | |||
| JPH06248393A | 1994-09-06 | |||
| KR100294354B1 | 2001-07-12 | |||
| US20100062279A1 | 2010-03-11 |
Attorney, Agent or Firm:
OH, Wihwan (KR)
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