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1. (WO2018181348) STAINLESS STEEL MATERIAL, CONSTITUENT MEMBER, CELL, AND FUEL CELL STACK

Pub. No.:    WO/2018/181348    International Application No.:    PCT/JP2018/012485
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Wed Mar 28 01:59:59 CEST 2018
IPC: H01M 8/0208
C22C 38/00
C22C 38/60
H01M 8/12
C21D 1/76
C21D 9/46
Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION
新日鐵住金株式会社
Inventors: NISHIMOTO, Takumi
西本 工
TARUTANI, Yoshio
樽谷 芳男
Title: STAINLESS STEEL MATERIAL, CONSTITUENT MEMBER, CELL, AND FUEL CELL STACK
Abstract:
A stainless steel material comprising a base that comprises ferritic stainless steel, a Cr oxide layer formed on the surface of the base, and a spinel-type oxide layer formed on the surface of the Cr oxide layer. The chemical composition of the base satisfies [16.0 ≤ Cr + 3 × Mo – 2.5 × B – 17 × C – 3 × Si ≤ 35.0]. The thickness (TCr) of the Cr oxide layer and the thickness (TS) of the spinel-type oxide layer satisfy [0.5 ≤ TCr/TS ≤ 6.7]. The base has a precipitate that includes one or more selected from composite precipitates which have M23C6, M2B, or M2B as the precipitation nucleus and in which M23C6 has precipitated on the surface thereof, and composite precipitates which have NbC as the precipitation nucleus and in which M23C6 has precipitated on the surface thereof. A portion of the precipitate projects from the surface of the Cr oxide layer.