Abstract：When thin strip casting and rolling oriented silicon steel, columnar crystals are easily formed in the structure of the casting strip, which are easily elongated into banded structures in subsequent processing and heat treatment processes, hindering the development of secondary recrystallization and reducing the electromagnetic properties of oriented silicon steel. In order to optimize the casting and rolling process parameters, this article uses the CAFE module in ProCAST and adopts orthogonal experiments to study the influence of various process parameters on the microstructure of the cast strip during the casting and rolling process of3% oriented silicon steel. The results show that the pulling speed has the greatest impact on the height of the Kiss point. As the roller speed increases, the height of the Kiss point decreases. When the pulling speed changes from 0.3 m/s to 0.7 m/s, the height of the Kiss point changes from 35.4 mm to 13.0 mm. The casting temperature has the greatest impact on the proportion of columnar crystals. As the casting temperature increases, the proportion of columnar crystals increases. When the casting temperature changes between 1 502 ℃ and 1 542 ℃, the proportion of columnar crystals varies between 14.4% and 81.3%. The casting temperature has the greatest impact on the average grain size. The higher the casting temperature, the larger the average grain size. The average grain size varies from 187.3 μm to 346.4 μm when the casting temperature changes from 1 502 ℃ to 1 542 ℃. In summary, the optimal parameters are as follows: casting temperature 1 502 ℃, casting speed 0.7 m/s, molten pool height 150 mm, corresponding Kiss point height 15.3 mm, columnar crystal proportion 18.3%, and average grain size 193.1 μm.
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GUO Zhi-hong, LIU Yu, LU Su-ling, ZHENG Ya-xu, ZHU Li-guang, SUN Hui-lan. Simulation of solidification structure of 3% oriented silicon steel produced by twin roll strip casting and rolling. CONTINUOUS CASTING, 2023, 42(3): 55-61.
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