Combined crystallizer for electroslag furnace

Abstract

The invention relates to a combined crystallizer for an electroslag furnace, which comprises at least two monomers, a steel outer tube body, two steel flange plates, wherein, the monomers are stacked together one by one from down to up when in use, and each monomer comprises a copper inner tube body; one flange plate of the two steel flange plates is respectively and fixedly connected with one end of the inner tube body and one end of the outer tube body, and the other flange plate is respectively and fixedly connected with the other end of the inner tube body and the other end of the outer tube body; and the inner tube body, the outer tube body and the flange plates form a closed cooling water cavity. The original integral crystallizer is decomposed into a plurality of monomers capable of being vertically stacked. When the crystallizer with the structure is used for smelting, the lengths of the electrode and the dummy electrode can be greatly reduced, therefore, the upper and lower travel of the cross arm of the electroslag furnace is reduced, the stability of the cross arm of the electroslag furnace is enhanced, the power loss is reduced and the manufacturing cost and the use cost of the electroslag furnace are reduced.

Description

technical field [0001] The invention relates to the technical field of electroslag furnaces, in particular to a crystallizer used for electroslag furnace production. Background technique [0002] Electroslag remelting is a secondary refining technology, a comprehensive metallurgical casting process that combines secondary refining of molten steel with directional solidification. The principle is that the current passes through the liquid slag pool and the slag resists heat, melting the metal electrode, and the molten metal gathers into molten droplets. When it drops, it passes through the slag layer and enters the molten metal pool, and then crystallizes and solidifies into a steel ingot in a water-cooled crystallizer. In the stage of the droplet formation at the electrode tip and the droplet dripping through the slag pool, the steel and slag are in full contact, and the non-metallic inclusions in the steel are absorbed by the slag. Harmful elements (sulfur, lead, antimony,...

AI Technical Summary

Problems solved by technology

For small crystallizers, the disadvantages of this structure are not prominent, but for large crystallizers, there are a series of problems in terms of equipment matching, process operation, crystallizer manufacturing, etc.

[0004] (1) Supporting aspects of electroslag furnace: When using a single-piece large-scale mold for steelmaking, the electroslag furnace must meet the production requirements. In the initial steelmaking stage at the bottom of the crystallizer, the electrodes and dummy electrodes must be very long, and the electroslag furnace should be horizontal. The effective up and down travel of the arm is very large, the column of the furnace body is very high, and the stability of the column cross arm becomes poor, which increases the technical difficulty of the electroslag furnace

[0005] (2) In terms of steel ingot manufacturing cost: After the length of the false electrode increases, the output voltage of the electroslag furnace and the voltage drop at the furnace mouth increase, and the reactive power loss increases, thereby increasing the production cost

[0006] (3) Crystallizer manufacturing: limited by material specifications, taking a 240t ingot electroslag remelting crystallizer as an example, the size of the copper plate required for this mold is 5050×9708mm, and the weight of a single piece is 17.62t, while the largest size of copper plate produced in China It is 3000×6000mm, and the weight of a single piece should not exceed 6.5t, so it is difficult to realize a single-piece structure

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