Application Study On The New Austenitic Heat-Resistance Steel Used In CFB Boiler Burning System

One of the most common and important problem the researchers and manufactories in 21century facing is evaluating the residual life of using equipment and the life of equipment. The life of the newly built equipment and the residual life of applying equipment are of great concern for manufactory. The research of the transform from metastable oxidate to stable oxidate and the growth rhythm of the stable oxidate film are necessary to evaluate the high temperature resistance equipment's life. Analyzing the film forming alloys' depletion behavior is called oxidation kinetics. The depletion behavior of the film forming elements under the interface between film and matrix directly affects the protection effect and the stability of the oxide film. Another problem is about the high temperature oxidation occurring in cyclical fluidized bed (CFB) power station boiler burning system and cyclical fluidized bed destructor burning system.This article deals with the high temperature oxidation kinetics of 353MA alloy used in the CFB power station boiler burning system. We analyze the variation of oxide film and the influence of microstructure variation on the alloy's mechanical property. We also evaluated the alloy's serving life and serving dependability.353MA alloy has the ability of selective oxidation in high temperature; Cr will be oxidized firstly, forming Cr₂O₃ film, and prevent further oxidation. The alloy's oxidation kinetic curves at 900℃, 1100℃ and 1200℃ are parabolic and the curves are different with each other, which show a different oxidation mechanism.The oxide film was analyzed with XRD. The oxide film is composed of a great deal of Cr₂O₃, little NiO·Cr₂O₄ and FeO·Cr₂O₃ at low temperature and...