Invention Grant
- Patent Title: Stainless steel having superior surface quality and moldability for fuel cell divider sheet, and method for manufacturing same
-
Application No.: US14368689Application Date: 2012-12-26
-
Publication No.: US09777344B2Publication Date: 2017-10-03
- Inventor: Jong Hee Kim , Ki-Hoon Jo , Yang Jin Chung , Yun Yong Lee , Sang Woo Lee
- Applicant: POSCO
- Applicant Address: KR Pohang-si
- Assignee: POSCO
- Current Assignee: POSCO
- Current Assignee Address: KR Pohang-si
- Agency: The Webb Law Firm
- Priority: KR10-2011-0142160 20111226
- International Application: PCT/KR2012/011515 WO 20121226
- International Announcement: WO2013/100600 WO 20130704
- Main IPC: C21D8/02
- IPC: C21D8/02 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/20 ; C22C38/26 ; C22C38/28 ; C21D6/00 ; H01M8/021 ; C22C38/22 ; C22C38/24 ; C21D1/26

Abstract:
Provided is a ferrite-based stainless steel having superior moldability when molding a fuel cell divider sheet from a material by controlling yield point elongation in accordance with alloy components. The ferrite-based stainless steel comprises, in weight percentages: no more than 0.02% of C; no more than 0.02% of N; no more than 0.4% of Si; no more than 0.2% of Mn; no more than 0.04% of P; no more than 0.02% of S; 25.0-32.0% of Cr; 0-1.0% of Cu; no more than 0.8% of Ni; no more than 0.01-0.5% of Ti; no more than 0.01-0.5% of Nb; no more than 0.01-1.5% of V; and residual Fe and inevitable elements, wherein the content of Ti, Nb, V, C, and N in terms of weight % of steel uses Formula (1) to render a yield point elongation of the material of no more than 1.1%, and wherein a steel material has superior moldability. 9.1C−1.76V+5.37(C+N)/Ti−1.22Nb≦0.7. Formula (1)
Public/Granted literature
Information query