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Controlling oxygen content in electro-slag remelting steel by optimizing slag-steel reaction process

China Foundry 2023年第6期20卷 503-510页

作者： Dian-dong Sun Yong Wang Lei Jin Zong-xu Pang Jian Huang Jian-ping Zhang Iron&Steel Research Institutes of Ansteel Group Corporation Anshan 114009LiaoningChina State Key Laboratory of Metal Material for Marine Equipment and Application Anshan 114009LiaoningChina Shenyang Research Institute of Foundry Co. Ltd.CAMNational Key Laboratory of Advanced Casting TechnologiesShenyang 110022China

The thermodynamic equilibrium of deoxidation reactions between molten slag and steel was calculated using a slag-steel coupling thermodynamic model and the mass conservation model based on the ion-molecular coexistence theory.The study focused on the effects of slag composition and deoxidizer type on the oxygen content of low alloy steel during the electroslag remelting(ESR)process.The measured and predicted values of the oxygen content in remelted ingots,and the contents of FeO and MnO in slags were compared and analyzed.Results show that the measured content of total oxygen has a certain correlation with the trend of dissolved oxygen predicted by the model when using Ca-Si alloys as deoxidizer,but it is not correlated with the trend of dissolved oxygen predicted by the model when using Al as deoxidizer.The deoxidation mechanisms of Ca-Si and Al are different.Ca-Si alloy directly reacts with FeO and MnO in slag to reduce the oxygen potential of slag,hence it can inhibit the transfer of oxygen from the slag to molten steel.While,when Al deoxidizer is used,the oxygen content in steel is mainly reduced through floating up the alumina inclusions.Compared to Al,utilizing Ca-Si alloy as a deoxidizer is more effective in reducing the oxygen content and the amount of inclusions in ESR ingot.

关键词： ion-molecular coexistence theory slag-steel reaction deoxidation electro-slag remelting

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维普期刊数据库

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An 2d Analysis of electromagnetic and Joule Heating Distribution in electro-slag remelting Process

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Journal of Iron and Steel Research(International) 2012年第S2期19卷 953-956页

作者： ZHANG Wei-jun WANG Zi-kun WANG Bo WANG Fang LI Rui-nan School of Materials and Metallurgy Northeastern University

electro-slag remelting(ESR)is a commonly used for the production of high-value-added alloys such as superalloys and specialty steels.In consideration of high trial costs and the complexity of the process,a steady-state numerical model has been developed that accounts for electromagnetic phenomena and coupled heat in an axisymmetrical geometry.The model considers electromagnetic effects and heat transfer.First of all,Maxwell equations are solved to determine the magnetic flux density,current density and Joule heating.Especially,the skin effect is shown and discussed based on numerical results.It is shown that the current density distribution on the external surfaces of slag and ingot.In slag,due to the low electrical conductivity of slag,the current distribution changes,gathering on the end of electrode.Next,Joule heating distribution is calculated by the Joule law.Joule heating is mainly in the slag,because the electrical conductivity in the slag is much lower than that in the electrode and the ingot.The maximum joule heating is below the interface of electrode and slag.

关键词： electro-slag remelting numerical simulation electromagnetic distribution current density distribution

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维普期刊数据库

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Numerical Simulation of electro-slag remelting Process Solidification Structure of Cr-Co-Mo-Ni Bearing Steel

Numerical Simulation of Electro-slag Remelting Process Solid...

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中国材料大会2012

作者： Liguo Bai Maosheng Yang Jingshe Li University of Science & Technology Beijing Central Iron & Steel Research Institute

ISBN: (纸本)9783037856093

The solidification microstructure and crystallization of Cr-Co-Mo-Ni bearing steel were simulated in solidification process based on CAFE methods in the electro-slag remelting process.The optimization of the intensity of cooling and molten pool temperature was simulated for Cr-Co-Mo-Ni bearing steel.The result shows that raising the cooling intensity to 7.5 m 3 /h and reducing the superheat temperature to 1600℃ can increase the grain nucleation number about 13.83%,and reduce the average columnar grain radius about 10.61%,to have a very good effect on refining the grains and get dense uniform solidification,which improve the homogeneity of the solidification structure,and reduce the performance differences of the materials.

关键词： Bearing steel CAFE electro-slag remelting Numerical Simulation Solidification Intensity of Cooling Molten Pool Temperature.

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