High-Temperature Oxidation Resistance of Austenitic Stainless Steel Cr18Ni11Cu3Al3MnNb

The kinetic curve of the high-temperature oxidation of austenitic stainless steel Cr18Ni11Cu3Al3MnNb at different temperatures was measured by weighting method. It is showed that the oxidation curves at 700 and 800 °C followed the parabolic law, and the steel presented an excellent anti-oxidation. The surface morphology and structure of the oxide film were studied by scanning electron microscopy and X-ray diffraction methods. A dense oxide film was attained at 700 and 800 °C, mainly composed of the hexagonal Al2O3, Fe2O3, and a small amount oxide of Cr at 700 °C. At 900 °C the oxide film started to delaminate, and was composed of (Cr, Fe)2O3 and the spinel CuCrMnO4 and Fe(Cr, Al)2O4.