公开(公告)号：US20240271240A1

公开(公告)日：2024-08-15

申请号：US18268557

申请日：2021-11-29

Applicant: POSCO Co., Ltd

Inventor： Byoung-jun Song ,  Youngjin Kwon ,  Gyujin Jo ,  Nayeon Chu

IPC: C21D9/00 ,  C21D1/18 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46

CPC classification number: C21D9/0081 ,  C21D1/18 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0268 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C21D2211/008

Abstract: Disclosed is a martensitic stainless steel with improved strength and corrosion resistance. The disclosed martensitic stainless steel sheet comprises, in percent by weight (wt %), 0.3 to 0.5% of C, 0.01 to 0.025% of N, 0.3 to 0.5% of Si, 0.4 to 0.6 of Mn, 13.1 to 14.5% of Cr, 0.95 to 1.10% of Mo, 0.05 to 0.3% of V, 0.3 to 0.5% of Ni, 0.001 to 0.5% of Cu, and the balance being Fe and inevitable impurities, and satisfies Formula (1). Formula (1): 16.4≤(Cr+3.3Mo+16N)*(Mo+V)≤23.3, wherein Cr, N, Mo, and V denote the contents (wt %) of respective elements.