Method for improving segregation and shrinkage of center of square and round billet

Abstract

The invention discloses a method for improving the segregation and shrinkage of the center of a square and round billet; when a cast billet is cooled, the growth rate of solidified shells of the cast billet in an inner arc direction and an outer arc direction is relatively higher while the growth rate of solidified shells of the cast billet in a left side direction and a right side direction is relatively lower through a cooling method according to which the cooling strength in the inner arc direction and the outer arc direction of the cast billet is consistent, the cooling strength in the left side direction and the right side direction is consistent but the cooling strength in the inner and the outer arc directions is higher than that in the left and the right side directions, so that a liquid core on a solidified tail end of the cast billet is a rectangular area which is squashed in the inner and the outer arc directions and elongated in the left and the right side directions. According to the method for improving the segregation and shrinkage of the center of the square and round billet, because segregation solute elements and the distribution methods of solidification and shrinkage are controlled, the center of the cast billet is prevented from being segregated and enriched in a small area, so that the segregation and shrinkage of the center of the square and round billet and other continuous casting billets with similar width and thickness of cross sections are effectively improved, the effect is significant and stable, the use is simple and easy, the cost is low, and the cost performance in implementation is high. Simultaneously, a dynamic slight compression technology in continuous casting and a tail end electromagnetic stirring technology can be implemented.

Description

technical field [0001] The present invention relates to the continuous casting molding technology of iron and steel materials and other metal materials, and specifically refers to a method for improving the central segregation and shrinkage cavity of continuous casting slabs. , especially the solidification process of square billet continuous casting, rectangular billet continuous casting and round billet continuous casting. [0002] Background technique [0003] With its advantages of high efficiency, high yield, low energy consumption and high quality, steel continuous casting has replaced die casting and has developed rapidly. With the rapid development of the steel industry, domestic and foreign steel production has reached saturation, and the quality of steel products has become an important goal for the development of the steel industry. The quality of continuous casting slab has an important influence on the production of subsequent products and the quality of final...

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The cost of the current effective control improvement methods is rel

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