Korea Advanced Institute of Science and Technology

Kepco Nuclear Fuel Co., Ltd.

Changheui Jang

Hyunmyung Kim

Chaewon Kim

Hyun Woo Koo

Sunghoon Hong

Seung Jae Lee

Yoon Ho Kim

Ho Jung Lee

Sung Yong Lee

Hun Jang

Byeong Seo Kong

Jin Woo Heo

Hyeon Bae Lee

Dae Gyun Ko

Jiho Shin

Chaewon Jeong

Gokul Obulan Subramanian

Austenitic stainless steel includes 16 to 26 wt % of chromium (Cr), 8 to 22 wt % of nickel (Ni), 0.02 to 0.1 wt % of carbon (C), 0.2 to 1 wt % of niobium (Nb), and 2 to 3.5 wt % of manganese (Mn), and has an austenite matrix, wherein a nanosized niobium carbide (NbC) is precipitated in the austenite matrix, and the nanosized niobium carbide is uniformly dispersed in the austenite matrix. The austenitic stainless steel may further include 0.5 to 1.5 wt % of molybdenum (Mo).

Austenitic stainless steel having a large amount of unifromly distributed nanometer-sized precipitates and preparing method of the same

The present disclosure relates to a high-strength Fe&#x2014;Cr&#x2014;Al&#x2014;Ni multiplex stainless steel and a manufacturing method therefor. The multiplex stainless steel comprises 35 to 67 wt % of iron (Fe), 13 to 30 wt % of chrome (Cr), 15 to 30 wt % of nickel (Ni), and 5 to 15 wt % of aluminum (Al) and has a multiplex structure in which an austenite phase accounting for high ductility, a ferrite phase accounting for high strength, and an NiAl(B2) phase providing both strength and high-temperature steam oxidation resistance, exist in combination. The multiplex stainless steel can secure necessary fabricability and mechanical strength even if for/in a thin state, can maintain integrity as a structural member in a normal operation condition of a light-water reactor thanks to the formation of a chrome oxide layer thereon, and can form a stable oxide layer including alumina under a high-temperature steam environment, which is plausible in a high-temperature nuclear accident, thereby providing exceptionally improved resistance to serious accidents.

High-strength Fe&#x2014;Cr&#x2014;Ni&#x2014;Al multiplex stainless steel and manufacturing method therefor

Embodiments of the disclosure relate to a ferritic alloy having excellent ability to withstand nuclear power plant accidents and a method of manufacturing a nuclear fuel cladding tube using the same. The alloy includes iron (Fe), aluminum (Al), chromium (Cr), and nickel (Ni). The nickel (Ni) may be included 0.5 to 10 wt % based on a total amount of the alloy. The chromium may be included 13 to 18 wt % based on the total amount of the alloy. The aluminum may be included 5 to 7 wt % based on the total amount of the alloy.

Ferritic alloy and method of manufacturing nuclear fuel cladding tube using the same

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Daejeon, South Korea

Changheui Jang