Interior-rodlike and exterior-tubular type electroslag remelting device with double electrodes connected in series and method

Abstract

The invention belongs to the technical field of metal smelting, and particularly relates to an interior-rodlike and exterior-tubular type electroslag remelting device with double electrodes connectedin series and a method. The device comprises a consumable electrode connection flange plate, an interior-rodlike and exterior-tubular type consumable electrode, a cooling water circulation system, a power supply system, a consumable electrode lifting device, an electrode guide rod and a crystallizer. The consumable electrode connection flange plate comprises a consumable electrode connection flange plate inner column and a consumable electrode connection flange plate outer ring. The interior-rodlike and exterior-tubular type consumable electrode comprises the consumable electrode with the rodlike inner layer and the consumable electrode with the tubular outer layer. One end of the electrode guide rod is welded to the consumable electrode lifting device, and the other end of the electrode guide rod is welded to the consumable electrode connection flange plate. The cooling water circulation system is used for cooling the crystallizer. The positive electrode of the power supply system isconnected with the electrode guide rod, and the negative electrode of the power supply system is connected with the consumable electrode connection flange plate outer ring. According to the interior-rodlike and exterior-tubular type electroslag remelting device, due to the adoption of interior-rodlike and exterior-tubular type double-electrode serial connection, the length of short grids can be reduced, and the electrical efficiency and the quality of prepared steel ingots can be improved.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, in particular to an inner rod and outer tube type bipolar series electroslag remelting device and method. Background technique [0002] With the rapid development of my country's nuclear power, heavy equipment manufacturing and other industries, the quality requirements for large steel ingots are getting higher and higher, and electroslag remelting is the main method for preparing high-quality large steel ingots. [0003] In the electroslag electroslag remelting process, the electroslag is put into the crystallizer, and a slag pool to be melted is formed above the crystallizer, and the electrode rod chuck is used to clamp the cylindrical electrode rod, and the electrode rod, slag Pools, metal baths, ingots and bottom tanks can form current loops through short mesh wires and transformers. [0004] Due to the use of single-electrode electroslag heating, the secondary short net is too long a...

AI Technical Summary

Problems solved by technology

However, smelting according to the arrangement of consumable electrodes in this device tends to concentrate the temperature at the ends of the two consumable electrodes, resulting in uneven temperature distribution of the slag pool and low heating efficiency.

In addition, due to the skin effect, the melting speed of the center of the end of the columnar self-consumable electrode is slow, and the metal droplets gather and grow toward the center, resulting in poor refining effect of the metal droplets, which increases the inclusion content in large steel ingots, and segregation and crystallization appear. Coarse phenomenon

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