Secondary-cooling reduction convex foot roll structure for bloom and reduction technology

Abstract

The invention discloses a secondary-cooling reduction convex foot roll structure for bloom and a reduction technology, and particularly relates to a secondary-cooling reduction convex foot roll structure for bloom and a reduction technology in the technical field of iron and steel metallurgy. The secondary-cooling reduction convex foot roll structure for the bloom comprises reduction-area upper foot rolls and reduction-area lower foot rolls, the reduction-area lower foot rolls are located under the reduction-area upper foot rolls, a boss is arranged in the middle of each reduction-area upper foot roll, a boss is arranged in the middle of each reduction-area lower foot roll, and the bosses of the reduction-area lower foot rolls are longer than the bosses of the reduction-area upper foot rolls. According to the secondary-cooling reduction-area reduction technology for the bloom, multiple groups of reduction-area upper foot rolls and reduction-area lower foot rolls are arranged, and the reduction quantity of the reduction-area upper foot rolls is gradually increased in the blank drawing direction. Therefore, the center segregation and center porosity problems of a continuous casting blank of the bloom can be effectively solved.

Description

technical field [0001] The invention relates to a structure and a reduction process of a protruding foot roll for secondary cold reduction of a bloom, in particular to a structure and a reduction process of a protruding foot roll for a secondary cold reduction of a bloom in the technical field of iron and steel metallurgy. Background technique [0002] Continuous casting slab reduction in the secondary cooling zone is an effective technology to improve continuous casting slab center segregation and porosity. The molten steel flow of the elements weakens the center segregation, and at the same time compensates the solidification shrinkage of the continuous casting slab to reduce the center porosity; the applied pressure is mainly mechanical stress. Among them, the amount of reduction is an important parameter to determine how much reduction is implemented. [0003] With the increase of the cross-sectional size of the billet, on the one hand, the volume compensating for the s...

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Problems solved by technology

However, due to the low temperature at the corner of the slab and the thicker solidified shell, the deformation resistance is greater, so the compression at the bottom of the slab is small. Therefore, under the same pressure, the upper central area of ​​the slab can be compressed by convex rolls. The power is increased by about 2 times, but the actual application effect is still limited

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