Method for direct intervening of internal quality of casting blank

Abstract

The invention relates to a method for direct interfering casting blank quality, belonging to field of continuous cast steel production technology. The method employs feeding apparatus to insert metallic band into mould liquid steel, and said band can vibrate according to applicable frequency and amplitude. The method interferes internal coagulation and crystallization directly by controlling band inserting mode and speed, the degree of superheat of crystallizer liquid steel is reduced, depth of liquid core is shortened, columnar crystal is decreased, equiax crystal proportion is increased, coagulation tissue of cast blank is improved, central aliquation is released, zigzag plasticity, dynamic ductility of steel products are improved, and fault localization percent of pass is increased. Furthermore, the pulling rate and production rate can be increased on condition of guaranteeing cast blank quality. The invention is characterized by low investment, reduced energy consumption, low operation cost, convenient device maintenance, and eligibility for various cast blank production.

Description

technical field [0001] The invention belongs to the technical field of continuous cast steel production in the metallurgical industry, and in particular relates to a method for directly intervening in the internal quality of a slab. Background technique [0002] The solidification process of molten steel plays an important role in the quality of steel. In the production process of continuous steel casting, the molten steel is rapidly cooled in the crystallizer to form a slab shell first, and the cooling process is from the edge to the inside, and the temperature in the center is high, resulting in a high temperature difference along the section of the slab, and the crystallization process In the middle, internal defects such as element analysis and central porosity are formed in the central area of ​​the slab. Practice has proved that this problem is a typical difficult problem in the continuous casting production process in the world. [0003] The use of high-quality cast...

AI Technical Summary

Problems solved by technology

At present, electromagnetic stirring is widely used in industry, but electromagnetic stirring not only consumes a lot of energy, but also produces bright white bands in the solidification structure of the billet, component segregation, and sometimes ring segregation, which is difficult to solve the center of the billet. Shrinkage cavity and central porosity

In addition, the cost of the electromagnetic stirring device is quite high, and the effective coefficient is quite low.

The use of electromagnetic stirring devices will make continuous casting operations and maintenance more troublesome, especially in the secondary cooling zone