A compact multi-stage small rod continuous casting crystallizer system

Abstract

The invention belongs to the technical field of small rod continuous casting, and in particular relates to a compact multi-section small rod continuous casting crystallizer system suitable for vertical continuous casting systems. The water cavity, the upper water outlet cavity, the gap in the water cavity, and the annular partition effectively isolate the cooling water before and after the heat exchange, ensuring that the circumferential metal melt is cooled and solidified evenly and rapidly, and at the same time, the polished graphite columnar inner wall acts on the surface of the slab. To achieve good lubrication and protection; for the purpose of secondary cooling, the cooling structure in the lower section vaporizes and atomizes the cooling water through the outer ring water chamber, the inner ring water chamber, the water spray unit and the adjustment device to realize the three This kind of cooling state conversion, further cooling the cast rod in the structure of the upper cooling section, can make the molten metal solidify rapidly, reduce the coarsening of the as-cast grain, increase the casting speed, and avoid excessive accumulation of molten metal in the mold system. Burn defect.

Description

Technical field: [0001] The invention belongs to the technical field of small rod continuous casting, and in particular relates to a compact multi-stage small rod continuous casting crystallizer system suitable for all alloy billet drawing casting processes. Background technique: [0002] The cooling system in the traditional crystallizer is mostly one-stage cooling, that is, it is composed of a water inlet, a water outlet and a water-cooled copper sleeve. The cooling water is sprayed to the water-cooled copper sleeve through the water inlet for cooling. Therefore, there are defects of insufficient cooling intensity and uneven cooling, and mixed crystal phenomenon is prone to occur. In addition, for small-section cast rods, the cooling shrinkage of the slab is significant, mainly due to the fact that during the cooling and crystallization process, the contact surface between the molten metal and the graphite mold wall is the most overcooled, and the outer shell is formed by ...

AI Technical Summary

Problems solved by technology

[0002] The cooling system in the traditional crystallizer is mostly one-stage cooling, that is, it is composed of a water inlet, a water outlet and a water-cooled copper sleeve. The cooling water is sprayed to the water-cooled copper sleeve through the water inlet for cooling. Therefore, there are defects of insufficient cooling intensity and uneven cooling, and mixed crystal phenomenon is prone to occur

In addition, for small-section cast rods, the cooling shrinkage of the slab is significant, mainly due to the fact that during the cooling and crystallization process, the contact surface between the molten metal and the graphite mold wall is the most overcooled, and the outer shell is formed by preferential directional solidification, and the shell is solidified. Shrinkage occurs, causing the billet shell to separate from the graphite casting mold wall, forming an inert gas film layer, and isolating the billet shell from the graphite casting mold wall. Because the thermal conductivity of the gas is low and the thermal expansion coefficient is large, the gap between the billet and the cooling water The heat exchange rate of the cast rod is poor, which is far from guaranteeing the complete solidification of the core of the cast rod. In addition, the molten metal at the upper end continuously flows into the graphite mold, which inevitably melts the crusted billet again. On the one hand, it increases the grain size of the cast rod structure. Inhomogeneity, on the other hand, it is easy to cause burning loss, introduce micro-cracks and cause breaking accidents, and seriously damage the surface quality of the slab

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