高 Si 含有オーステナイト系ステンレス鋼の耐高温酸化性におよぼす希土類元素および Ca の影響(<特集>ステンレス鋼)

概要

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Recently, austenitic stainless steels containing high Si are considered as material to be used for automobile exhaust-emission-control systems. A study has been made of the effects of rare earth elements and Ca upon the oxidation behavior of 19%Cr-13%Ni-3%Si-Fe system steel in air in the temperature range from 1000 to 1200℃. The addition of suitable amount of rare earth elements improved markedly the scaling resistance and the spalling resistance up to 1100℃, but did not improve the scaling resistance at 1200℃. On the contrary, the addition of Ca improved remarkably the scaling resistance up to 1200℃ and spalling resistance at 1000℃, but did not improve the spalling resistance at 1100℃ so much. The complex addition of suitable amount of rare earth elements and Ca was very effective for both the scaling resistance and the spalling resistance up to high temperature.
1977-04-01