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某钢厂生产的150 mm×150 mm小方坯铸坯质量不稳定,主要问题在于铸坯中心碳偏析及横截面低倍不合格率较高。因此在该连铸机上采用末端电磁搅拌设备并进行现场试验。探讨了不同搅拌位置、搅拌频率、电流大小、搅拌方式及铸机拉速对铸坯质量的影响。实验结果表明,在液芯厚度分别为35、60 mm处进行电磁搅拌均会导致中心偏析严重。电磁搅拌频率、电流大小、搅拌方式、拉速也会对铸坯内部质量产生影响。根据实验结果,在该连铸机生产工况下,最佳末搅位置在液芯厚度45 mm处,较为合理的搅拌参数为电流400 A、频率12 Hz、交替搅拌方式。拉速提高不利于铸坯内部质量。
The quality of a 150 mm × 150 mm billet billet produced by a steel mill is unstable. The main problems are the carbon segregation at the center of the billet and the high unacceptability of the low cross section. Therefore, the end of the continuous casting machine electromagnetic stirring equipment and field trials. The effects of different stirring positions, stirring frequency, current, stirring method and casting machine pulling speed on slab quality were discussed. The experimental results show that electromagnetic stirring at the liquid core thickness of 35 and 60 mm respectively leads to severe center segregation. Electromagnetic stirring frequency, current size, mixing mode, casting speed will also affect the internal quality of the slab. According to the experimental results, under the continuous caster production conditions, the optimum final stirring position is at the liquid core thickness of 45 mm. The more reasonable stirring parameters are current 400 A, frequency 12 Hz and alternate stirring mode. Increased casting speed is not conducive to the internal quality of the slab.