US 12,110,578 B2
Austenitic stainless steel having a large amount of unifromly distributed nanometer-sized precipitates and preparing method of the same
Changheui Jang, Daejeon (KR); Jiho Shin, Daejeon (KR); Byeong Seo Kong, Daejeon (KR); Hyeon Bae Lee, Daejeon (KR); Chaewon Jeong, Daejeon (KR); and Hyun Woo Koo, Daejeon (KR)
Assigned to KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY, Daejeon (KR)
Appl. No. 17/045,267
Filed by KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY, Daejeon (KR)
PCT Filed Dec. 6, 2019, PCT No. PCT/KR2019/017159
§ 371(c)(1), (2) Date Oct. 5, 2020,
PCT Pub. No. WO2021/100959, PCT Pub. Date May 27, 2021.
Claims priority of application No. 10-2019-0147897 (KR), filed on Nov. 18, 2019.
Prior Publication US 2023/0117314 A1, Apr. 20, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C22C 38/58 (2006.01); C21D 8/02 (2006.01); C22C 38/48 (2006.01)
CPC C22C 38/58 (2013.01) [C21D 8/0226 (2013.01); C22C 38/48 (2013.01); C21D 2211/001 (2013.01)] 10 Claims
OG exemplary drawing
 
1. Austenitic stainless steel comprising
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 including an austenite matrix, wherein
a niobium carbide (NbC) is precipitated in the austenite matrix, and
the niobium carbide is uniformly dispersed in the austenite matrix,
wherein an average diameter of the niobium carbide is equal to or less than 11 nm, and
wherein the austenitic stainless steel is a forged multi-pass hot rolled stainless steel.