To develop a high heat-resistant stainless steel with high formability for automotive exhaust manifolds, the influences of Mo and Si contents on the formability, oxidation resistance, and high temperature strength of 14%Cr ferritic stainless steel were investigated. Mo addition increased oxidation resistance and high temperature strength remarkably. Si addition increased significantly oxidation resistance but had a little effect on high temperature strength. Based on these findings, a high heat-resistant Mo-added ferritic stainless steel with high formability, RMH-1 (14.5% Cr-0.3% Si-0.5% Nb-1.6% Mo), has been developed. The newly developed steel possesses not only the advantage of the existing high heat-resistant type but also that of high formability type stainless steels. Namely, RMH-1 possesses high temperature strength and fatigue properties equal to those of a conventional SUS444 steel, R434LN2 (19% Cr-0.3 % Si-0.35% Nb-1.8% Mo), which is considered to be a high heat-resistant steel for automotive exhaust applications, combined with formability equal to that of the conventional R429EX (14.5% Cr-0.9% Si-0.45% Nb), which is used as a high formability steel in the same applications. (VDEh)
High heat-resistant ferritic stainless steel with high formability, 'RMH-1', for automotive exhaust manifolds by making the most of Mo
Der hochhitzebeständige molybdänlegierte ferritische nichtrostende Stahl 'RMH-1' mit sehr guter Umformbarkeit für Auspuffrohre von Kraftfahrzeugen
Titel japanisch
Kawasaki Steel Giho ; 34 , 2 ; 81-84
2002
4 Seiten, 7 Bilder, 4 Tabellen, 14 Quellen
Article (Journal)
Japanese
Heat-resistant ferritic stainless steel with high formability for automotive exhaust gas systems
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