Effects of chromium addition on high temperature oxidation behavior of hot rolled low carbon steel
LI Zhi-feng1,2, HE Shuai1, XING Shu-qing1, MA Yong-lin1, LIU Zhen-yu2
1. College of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Nei Mongol, China; 2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China
Abstract：In order to study the compound effect of chromium and heating process parameters (heating temperature,holding time) on the oxide scale formed on the surface of hot rolled low carbon steel,the effect of chromium content on high temperature oxidation behavior of low carbon steel in air at 1 100-1 250 ℃ was studied by thermogravimetry analysis. The oxidation rate constant was calculated. The phase composition,the micro-structure and the element proportion of oxide scale under different experimental conditions were compared. The results show that the high temperature oxidation presented a two-stage model. The oxidation kinetics curve was linear in the early stage of oxidation,and then changed to parabolic in the middle and late stage of oxidation. The transformation time from linear to parabolic was shortened with the increase of chromium content in the steel. The structure of the oxide scale was composed of the outermost Fe2O3 layer,the middle Fe3O4 layer and FeO layer,and the chromium rich spinel (FeCr2O4) layer near the substrate after the adding of the chromium. In the oxidation process,the FeCr2O4 layer suppressed the outward diffusion of the iron ions and the electrons,and reduced the oxidation rate. Meanwhile,the high temperature oxidation resistance of low carbon steel was significantly improved.
李志峰, 贺帅, 邢淑清, 麻永林, 刘振宇. 铬元素添加对热轧低碳钢高温氧化行为的影响[J]. 钢铁, 2021, 56(9): 110-117.
LI Zhi-feng, HE Shuai, XING Shu-qing, MA Yong-lin, LIU Zhen-yu. Effects of chromium addition on high temperature oxidation behavior of hot rolled low carbon steel[J]. Iron and Steel, 2021, 56(9): 110-117.
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2021, Vol. 56 
