Stainless steel material, constituting component, cell, and fuel cell stack

A stainless steel material including a base material made of ferritic stainless steel, a Cr oxide layer formed on a surface of the base material, and a spinel oxide layer formed on a surface of the Cr oxide layer, wherein a chemical composition of the base material satisfies [16.0≤Cr+3×Mo−2.5×B−17×C...

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Bibliographische Detailangaben
Hauptverfasser:	Tarutani, Yoshio, Nishimoto, Takumi
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS BASIC ELECTRIC ELEMENTS CHEMISTRY ELECTRICITY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	A stainless steel material including a base material made of ferritic stainless steel, a Cr oxide layer formed on a surface of the base material, and a spinel oxide layer formed on a surface of the Cr oxide layer, wherein a chemical composition of the base material satisfies [16.0≤Cr+3×Mo−2.5×B−17×C−3−Si≤35.0], a thickness of the Cr oxide layer (TCr) and a thickness of the spinel oxide layer (TS) satisfy [0.55≤TCr/TS≤6.7], the base material contains precipitate including one or more kinds selected from a M23C6, a M2B, a complex precipitate in which M2B acts as a precipitation nucleus, and M23C6 precipitates on a surface of the M2B, and a complex precipitate in which NbC acts as a precipitation nucleus, and M23C6 precipitates on a surface of the NbC, and a part of the precipitate protrude from the surface of the Cr oxide layer.