Abstract
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°C.
The addition of suitable amount of rare earth elements improved markedly the scaling resistance and the spalling resistance up to 1100°C, but did not improve the scaling resistance at 1200°C. On the contrary, the addition of Ca improved remarkably the scaling resistance up to 1200°C and spalling resistance at 1000°C, but did not improve the spalling resistance at 1100°C 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.
