Development of high heat-resistant ferritic stainless steel with high formability, "RMH-1," for automotive exhaust manifolds by optimizing Mo composition design

Atsushi Miyazaki, Junichiro Hirasawa, Osamu Furukimi

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)28-32
    Number of pages5
    JournalKawasaki Steel Technical Report
    Issue number48
    Publication statusPublished - Jan 1 2003

    All Science Journal Classification (ASJC) codes

    • Metals and Alloys

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