公开(公告)号：US20240026507A1

公开(公告)日：2024-01-25

申请号：US18265167

申请日：2021-10-29

Applicant: POSCO Co., Ltd

Inventor： Soo-ho Park ,  Dong-hoon Kim ,  Jae-seok Park ,  Youngjun Kim

IPC: C22C38/44 ,  C22C38/02 ,  C22C38/04 ,  C22C38/00 ,  C22C38/06 ,  C21D8/02

CPC classification number: C22C38/44 ,  C22C38/02 ,  C22C38/04 ,  C22C38/001 ,  C22C38/06 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/0273 ,  C21D2211/005

Abstract: Disclosed is a ferritic stainless steel with reduced grain boundary erosion. A ferritic stainless steel with reduced grain boundary erosion according to an embodiment includes, in percent by weight (wt %), 0.005 to 0.1% of C, 0.01 to 1.0% of Si, 0.01 to 1.5% of Mn, 13 to 18% of Cr, 0.005 to 0.1% of N, 0.005 to 0.2% of Al, 0.005 to 0.1% of Ni, 0.003% or less of Mo, 0.05% or less of P, 0.005% or less of S, and the remainder being Fe and impurities, and satisfies an Acl, defined by Formula (1) below, of 900 or more and 990 or less:


Ac1=36Cr+90Si+76Mo+760Al+350−(800C+1300N+150Ni+50Mn)  Formula (1):

(wherein C, N, Si, Mn, Cr, Ni, Al, Mn, and Mo represent a content (wt %) of each element).

公开(公告)号：US20240043973A1

公开(公告)日：2024-02-08

申请号：US18268562

申请日：2021-12-10

Applicant: POSCO Co., Ltd

Inventor： Hyung-gu Kang ,  Dong-hoon Kim ,  Gyujin Jo

IPC: C22C38/42 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: C22C38/42 ,  C22C38/04 ,  C22C38/02 ,  C22C38/001

Abstract: Disclosed is a martensitic stainless steel with excellent hardenability through the control of a component system. The martensitic stainless steel with excellent hardenability comprises, in percent by weight (wt %), 0.01 to 0.1% of C, 0.05 to 0.1% of Si, 0.05 to 1.0 of Mn, 11.0 to 14.0% of Cr, 0.05 to 1.0% of Ni, 0.05 to 2.0% of Cu, to 0.08% of N, and the balance of Fe and inevitable impurities, and satisfies Formula (1).


1.0≤Mn+Ni+Cu≤2.5,   Formula (1):

wherein Mn, Ni, and Cu denote contents (wt %) of elements, respectively.

公开(公告)号：US20230420698A1

公开(公告)日：2023-12-28

申请号：US18038396

申请日：2021-11-17

Applicant: POSCO Co., Ltd

Inventor： Youngjun Kim ,  Dong-hoon Kim ,  Bo-sung Seo

IPC: H01M8/021 ,  C25F1/06 ,  C21D1/76 ,  C21D1/26

CPC classification number: H01M8/021 ,  C25F1/06 ,  C21D1/76 ,  C21D1/26 ,  C21D2211/001

Abstract: Disclosed is an austenitic stainless steel for a fuel cell separator with improved contact resistance. The austenitic stainless steel for a fuel cell separator with improved contact resistance according to an embodiment of the present disclosure includes, in percent by weight (wt %), at most of C (excluding 0), at most 3.0% of Si (excluding 0), at most 3.0% of Mn (excluding 0), 20 to 30% of Cr, 8 to 20% of Ni, at most 0.003% of S, at most 0.03% of P, at most 0.6% of Mo (excluding 0), at most 0.8% of Cu (excluding 0), 0.1 to 0.3% of N, at most 2.0% of W (excluding and the remainder being Fe and other inevitable impurities.