An electroslag remelting process and electrode replacement method thereof

Abstract

The invention provides an electroslag remelting process and an electrode replacement method thereof. The method includes: disconnecting the smelting high voltage, detecting the electrical signal of the molten pool in real time, and obtaining the initial electrical signal; lifting the electrode to the first position at a first speed; continuing to lift the electrode at a second speed higher than the first speed, and obtaining In the second position, replace the electrode at the third position; lower the second electrode to the fourth position at the third speed, and continue to decrease the distance between the first and second positions, the first, second and fourth positions are the electrical signals of the molten pool in turn The electrode position corresponding to the moment of sharp change, the electrode position corresponding to the moment when the electrode leaves the crystallizer mouth, the electrode position corresponding to the moment when the replaced electrode enters the mold mouth; the second electrode is lowered to the point where it is detected again at a fourth speed lower than the third speed close to the initial electrical signal. The invention can improve the replacement speed of the consumable electrode, and is beneficial to improve the production efficiency and automation degree, as well as the quality and performance of the billet.

Description

technical field [0001] The invention belongs to the technical field of electrometallurgy, and specifically relates to an electrode replacement method capable of increasing the replacement speed of consumable electrodes in an electroslag remelting process, and an electroslag remelting process including the electrode replacement method. Background technique [0002] Generally, the electroslag remelting process can obtain an ingot with a uniform and dense crystal structure, which is widely used in the production of special metals and high-quality alloy steel. A large steel ingot can be produced from multiple electrodes by exchanging consumable electrodes, which is a widely used form at present. For single-phase electroslag furnaces, the operation of exchanging electrodes must be powered off, and the melting pool temperature will drop if the melting is interrupted. If the time is too long, slag grooves will be generated or cracks will be caused during the ingot forging process. ...

AI Technical Summary

Problems solved by technology

For single-phase electroslag furnaces, the operation of exchanging electrodes must be powered off, and the melting pool is interrupted to lower the temperature of the molten pool. If the time is too long, slag grooves will be generated or cracks will be caused during the ingot forging process.

At present, manual operation is used to exchange electrodes and test the position of the liquid level, which requires skilled operation technology and the time is uncertain, which directly affects the quality and production efficiency of electroslag ingots, and affects the reproducibility of the process

[0003] In addition, since the solid-liquid phase transition interface formed at the bottom of the consumable electrode of the electroslag furnace during the melting process cannot be directly measured, it is difficult to accurately determine the position of the consumable electrode

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