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一般来说,在二冷区设置电磁搅拌的目的在于: (1)促使“低温浇铸”,降低钢液的过热度,在穿晶区内扩大等轴晶区,也可通过树枝晶末稍折断后作为新晶核来加速等轴晶区的形成: (2)改善铸坯内部组织的均匀性。它涉及到中心缩孔,中心偏析及等轴晶区。中心偏析在小断面铸坯中比较普遍,尤其是含碳量较高的钢种,因为它可导致更大的穿晶作用; (3)降低质量要求严格的铸坯产生裂纹
In general, the purpose of setting the electromagnetic stirring in the second cooling zone is to: (1) Promote “low temperature casting” to reduce superheat of the molten steel and enlarge the equiaxed zone in the transcrystalline zone, After as a new nucleus to accelerate the formation of equiaxed zone: (2) to improve the uniformity of the internal structure of the slab. It involves the center shrinkage, center segregation and equiaxed zone. Center segregation in the small section of the slab is more common, especially the higher carbon content of steel, because it can lead to greater transcrystallization; (3) reduce the quality of the slab cracks