Research progress on inclusion control of non-oriented silicon steel with REM treatment
YANG Jian1,2, LI Ting-ting1,2
1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China; 2. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China
Abstract：The magnetic properties of cold rolled non-oriented silicon steel which are highly dependent on the steelmaking technology, are affected by chemical compositions, distribution of inclusions, recrystallization structure and so on in steel. Long strip or angular inclusions usually have a greater impact on coercivity and hysteresis loss than spherical inclusions. The inclusions which have great influence on the magnetic properties of non-oriented silicon steel are mainly with the size smaller than 0.5 μm. The effects of rare earth metal(REM) treatment on inclusions in non-oriented silicon steel are summarized and analyzed, including coarsening inclusions, reducing the number of fine inclusions in steel and spheroidizing inclusions. REM have strong deoxidation ability and can effectively purify molten steel. With the addition of REM, the rare earth oxides or rare earth oxide sulfides generated in non-oriented silicon steel are usually spherical or nearly spherical. Due to the high surface activity of REM, the generated fine inclusions are easier to polymerize and grow up in the molten steel, and finally achieve the modification and coarsening of inclusions. Because the rare earth sulfides and rare earth oxide sulfides have high melting point and are difficult to form solid solution, the solid solution amount of S element can be effectively reduced during reheating process and the precipitation of fine MnS inclusions can be inhibited during cooling process. In addition, AlN and MnS inclusions are easy to precipitate on the surface of rare earth inclusions, further reducing the amount of fine precipitates. REM can improve the texture of products and has the optimal addition amount. At the same time, the technology of rare earth addition during the refining process of non-oriented silicon steel at home and abroad is analyzed. The ladle addition method is mainly used in the refining process of non-oriented silicon steel. The rare earth treatment results are ensured by adding REM under vacuum, pre-deoxidizing the molten steel by adding Al and Si elements, and injecting desulfurizer before the addition of REM, and then fully stirring the molten steel after adding REM. However, there is still the nozzle clogging problem caused by rare earth inclusions in the process of continuous casting, which needs to be studied.
杨健, 李婷婷. 稀土处理的无取向硅钢夹杂物控制研究进展[J]. 钢铁, 2022, 57(7): 1-15.
YANG Jian, LI Ting-ting. Research progress on inclusion control of non-oriented silicon steel with REM treatment[J]. Iron and Steel, 2022, 57(7): 1-15.
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2022, Vol. 57 
