High temperature oxidation behavior of 300M steel

doi:10.13251/j.issn.0254-6051.2020.11.010

Abstract

Abstract: Oxidation behavior of the 300M steel at high temperature between 700-1200 ℃ was investigated. Surface morphologies of oxide layer and the oxide structure were investigated by means of SEM and XRD. Combined with the analysis of oxidation kinetics curves, the oxidation mechanism of the 300M steel between 700-1200 ℃ was analyzed. The results show that the 300M steel presents parabolic law in the temperature range of 700-1200 ℃. At high temperature, the oxide scale of the 300M steel has a typical three-layer structure, which is the outer layer, the middle layer, and the inner layer, and the inner layer is divided into porous layer and loose layer. When the oxidation temperature is 1200 ℃, the alloying elements Si and Cr in the FeO layer grains rapidly aggregate and form coarse oxides, at this time, the FeO layer completely loses its antioxidant effect, and the oxidation rate accelerates sharply.

Key words: 300M steel, high temperature oxidation, oxidation kinetics, oxide scale, oxidation mechanism

CLC Number:

TG142

Xia Weijun, Zhao Qingqing, Yuan Wuhua, Zhang Haicheng. High temperature oxidation behavior of 300M steel[J]. Heat Treatment of Metals, 2020, 45(11): 49-55.

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