Effect of Carburizing Atmosphere on High-Temperature Oxidation Resistance of 17% Cr Ferritic Stainless Steel Doped with Cu and Ni

  • Hayashi Atsutaka
    Research & Development Center, NIPPON STEEL Stainless Steel Corporation
  • Hiraide Nobuhiko
    Research & Development Center, NIPPON STEEL Stainless Steel Corporation
  • Hamada Jun-ichi
    Research & Development Center, NIPPON STEEL Stainless Steel Corporation
  • Inoue Yoshiharu
    Products Development Division, NIPPON STEEL Stainless Steel Corporation

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Other Title
  • 17%Cr添加フェライト系ステンレス鋼の耐酸化性に及ぼすCu,Ni添加および浸炭性雰囲気の影響

Abstract

<p>Stainless steel is used as a heat-resistant material not only in air, but also in carburizing atmospheres containing CO and CO2. Carburization may cause austenization for ferritic stainless steels. In this study, the high-temperature oxidation behaviors of 17% Cr ferritic stainless steels with and without the addition of austenite-forming elements, such as Cu and Ni, in a carburizing atmosphere at 1123 K were investigated. The steels did not exhibit breakaway oxidation in the temperature range of 1123-1273 K in air. However, doping the steels with Cu and Ni enhanced breakaway oxidation in a carburizing atmosphere at 1123 K. Traces of austenization and carburization were observed at the base metal under the breakaway oxidation scale of the 17% Cr steel doped with 1% Cu and 1% Ni. Thus, it is proposed that the breakaway oxidation of the ferritic stainless steels in a carburizing atmosphere is attributed to austenization induced by carburization and doping with austenite-forming elements.</p>

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