公开(公告)号：US11649517B2

公开(公告)日：2023-05-16

申请号：US16083713

申请日：2017-09-20

Applicant: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Changheui Jang ,  Hyunmyung Kim ,  Gokul Obulan Subramanian ,  Jin Woo Heo ,  Ho Jung Lee ,  Sunghoon Hong ,  Chaewon Kim

IPC: C21D9/46 ,  C21D6/00 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/48 ,  C22C38/50 ,  C22C38/18

CPC classification number: C21D9/46 ,  C21D6/004 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/48 ,  C22C38/50 ,  C21D2211/001 ,  C21D2211/004 ,  C21D2211/005

Abstract: The present disclosure relates to a high-strength Fe—Cr—Al—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.

公开(公告)号：US12110578B2

公开(公告)日：2024-10-08

申请号：US17045267

申请日：2019-12-06

Applicant: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Changheui Jang ,  Jiho Shin ,  Byeong Seo Kong ,  Hyeon Bae Lee ,  Chaewon Jeong ,  Hyun Woo Koo

IPC: C22C38/58 ,  C21D8/02 ,  C22C38/48

CPC classification number: C22C38/58 ,  C21D8/0226 ,  C22C38/48 ,  C21D2211/001

Abstract: 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).