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| Crystallization of CaO-SiO2-Al2O3 based inclusions in solid steel killed by Si-Mn alloys |
| MENG Yao-qing1,2, LI Jian-li1,2, ZHU Hang-yu1,2, WANG Kun-peng3, WANG Wei4 |
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;
3. Technology Center, Zenith Steel Group Co., Ltd., Changzhou 213011, Jiangsu, China;
4. Rolling Plant, Jiangsu Yong Gang Group Co., Ltd., Zhangjiagang 215628, Jiangsu, China |
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Abstract In order to avoid the harm of high melting point hard inclusions such as Al2O3 and MgO·Al2O3 to subsequent processing of steel and product service properties, inclusion plasticizing control technique by Si-Mn killed is adopted for some steels, such as valve-spring steel, saw-wire steel and the thinnest stainless steel. It is insufficient for inclusion plasticizing control technique to focus only on whether the inclusion composition is in the low melting point region of phase diagram. The good plastic deformation of silicate inclusions in steel under non-liquid condition is mainly due to their properties of glass materials, and their softening temperature is obviously lower than hot rolling temperature. The hot rolling rheology of silicate inclusions largely depends on their crystallization state, so the transition of the inclusion from glassy state to crystalline state needs to be studied and controlled. The differences between glassy and crystalline inclusions were compared in terms of microstructure and microhardness change during heating, and the adverse effects of inclusion crystallization on the inclusion plasticizing control technique were pointed out. Through industrial examples and literature reports, it was clarified that glass inclusions may undergo crystallization transformation during steel solidification and heat treatment prior to hot rolling. In order to prevent serious crystallization of glassy inclusions, it is necessary to optimize the heating temperature and time of bloom/billet by combining the TTT curve of inclusions, or controlling the inclusion composition to fall into the more stable region of glass phase. Based on the research of current scholars, it is considered that the eutectic zone of tridymite, pseudo-wollastonite and anorthite is the ideal composition region for CaO-SiO2-Al2O3 system inclusions to realize glass state stability control. The influence of magnesium oxide and alkali oxides on the crystallization properties of oxide inclusions in Si-Mn killed steel still needs to be studied further. And the TTT diagrams for relevant oxide inclusion compositions can be studied by the method such as SHTT (single hot thermocouple technology).
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Received: 27 January 2022
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2022, Vol. 57 
