Abstract
Herein, a physical model with a geometric similarity ratio of 1:1 and a 3D numerical model of macrosegregation are established to study the initial metallurgy behavior of the 410 mm × 530 mm section bloom continuous casting (CC). The results show that the average wave height, liquid surface velocity, and washing velocity of the five‐port nozzle are greater than those of the straight nozzle, but the center temperature and the temperature gradient at the solidification front are lower. Meanwhile, the diagonally installed five‐port nozzle can avoid the excessive washing effect under the orthogonally installed five‐port nozzle, which improves the minimum subsurface negative segregation index, which is increased from 0.753 to 0.802. For the Steel 45 bloom CC process, when the straight nozzle is changed to the diagonally installed five‐port nozzle, the length of the equiaxed crystal zone is increased from 97.5 to 198.5 mm, and the asymmetry of the solidification structure is improved.
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