Effect of cooling uniformity on the internal reduction efficiency of a slab

Abstract

Cooling uniformity has a great influence on slab solidification. To study its effect on the internal reduction efficiency, a thermo-mechanical coupling slab solidification model was studied and an internal reduction efficiency calculation model was established. Numerical simulation was performed with ProCAST software and verified by a pin shooting test. The results showed that under uniform cooling, when the reduction amount was more than 3 mm, the internal reduction efficiency was 38-41%, and under non-uniform cooling, the internal reduction efficiency for the 1/ 4 width and 1/8 width of the slab was 21-28%, while that for the 1/2 width was 45-47%. The soft reduction process parameters was optimized accordingly. Industrial trials showed that an increase in the reduction amount could decrease the central segregation for the 1/4 width of the slab, and the maximum central carbon segregation index was reduced from 1.29 to 1.18.

Roll‐Gap Deviation on Centerline Segregation Evolution in Continuous Casting Slab

“…The formation mechanisms of center segregation have been investigated by many researchers. [3][4][5][6][7] The low superheat casting, [8][9][10] electromagnetic stirring, [11][12][13][14] and mechanical reduction [15][16][17][18] were proposed to reduce the center segregation defect in the continuous casting. However, the influence of RGD [19,20] on solute redistribution is less studied, even though it is commonly observed in the continuous caster.…”

“…Domitner et al [ 15 ] indicated that the mechanical reduction zone should cover the end position of shell bulging, where the segregation can be reduced. Both conducted experiment and simulation, Li et al [ 16 ] found the reduction efficiency was improved clearly with the uniform cooling, and the center segregation of the slab 1/4 width was reduced with a larger reduction amount. Bleck et al [ 17 ] indicated that the reduction position is an important factor for slab center segregation improvement.…”