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| Thermal simulation experiments of melting behavior of steel scrap in molten steel |
| LIU Meng-ke1,2, MA Guo-jun1,2, ZHANG Xiang1,2, YAO Wang-long1,2 |
1. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China;
2. Hubei Provincial Key Laboratory of New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China |
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Abstract The melting process of steel scrap is a limiting factor to control the temperature track and scrap ratio of converter steelmaking as well as the energy consumption and productivity of EAF steelmaking. In order to study the melting mechanism of steel scrap, the heat and mass transfer process of steel scrap melting was considered, and based on the theoretical analysis model, a thermal simulation experiment of steel scrap melting was carried out in the laboratory. The results show that the solidification layer is formed when the steel bars are immersed in the molten steel for a short time. Due to the chilling effect, an air gap is formed between the solidified layer and the bar. During the immersion process, the microstructure of the steel bar changes from pearlite and ferrite to austenite. After water quenching, acicular martensite is formed in the carburized layer, and lath martensite is formed inside the steel bar. When the steel bar is immersed for too long in the molten steel, the outer of the steel bar changes from austenite to ferrite and liquid phase.
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Received: 09 October 2020
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2021, Vol. 56 
