Precipitation and control of MnS inclusions by thermodynamic analysis
ZHANG Xue-wei1, YANG Cai-fu1, CHAI Feng1, LUO Xiao-bing1, ZHANG Li-feng2, DONG Yuan-chi3
1. Institute for Engineering Steel, Central Iron and Steel Research Institute, Beijing 100081, China 2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 3. School of Metallurgical Engineering, Anhui University of Technology, Ma′anshan 243032, Anhui, China
Abstract:To study and control the large size MnS inclusion in heavy rail steel. Aiming at the problems that the thermodynamic calculation of MnS is complex and difficult to be solved. It needs to be selected according to the actual conditions in a practical calculation, the main current thermodynamic parameters were compared and discussed, and then the piecewise calculation was established on the basis of the generated process of MnS inclusions in U75V steel. It is shown that the effective temperature of MnS precipitation is 1 631 K using the commercial software FactSage 6.4, this is 63 K gap by the thermodynamics parameter calculation results of 1 694 K. It can accurately forecast the precipitation behavior of MnS inclusions and decrease the difficulty of the thermodynamic analysis of MnS inclusions by the CSC method. The amounts of solid solution sulfur in steel were 0.000 67%, 0.001 67% and 0.010 8% at 1 473, 1 573 and 1 673 K, respectively. The conclusion is that the effective control MnS inclusions are more reasonable and effective by decreasing the mass percent of S less than 0.001 67% before the casting rolling and under the heating temperature of 1 563 K.
张学伟, 杨才福, 柴锋, 罗小兵, 张立峰, 董元篪. 热力学分析MnS夹杂物析出与控制[J]. 钢铁, 2019, 54(12): 27-34.
ZHANG Xue-wei, YANG Cai-fu, CHAI Feng, LUO Xiao-bing, ZHANG Li-feng, DONG Yuan-chi. Precipitation and control of MnS inclusions by thermodynamic analysis. Iron and Steel, 2019, 54(12): 27-34.
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