Method for carrying out electroslag remelting by using single-inlet multi-outlet type water-cooling crystallizer electroslag remelting device

Abstract

The invention discloses an electroslag remelting device of a single-inlet and multi-outlet type water-cooled crystallizer and a use method, which can achieve the purposes of simultaneously refining internal structure grains of an electroslag ingot and improving the surface quality of the electroslag ingot. Therefore, the invention develops a single-inlet multi-outlet type water-cooling crystallizer which consists of a lower water inlet, a water outlet at the topmost part of the crystallizer and a plurality of water outlets vertically arranged along the height direction of the crystallizer. During electroslag remelting, opening and closing of each water outlet are dynamically adjusted according to the height of an electroslag ingot in the crystallizer; and in the electroslag remelting process, the water outlet in the topmost part of the water-cooling crystallizer is always in an open mode, and the other water outlets are sequentially opened and closed according to the height of an electroslag ingot. No matter how the water cooling system of an existing single-inlet single-outlet water cooling crystallizer is changed, the problem that the internal quality or the surface quality of an electroslag ingot is poor and cannot be improved at the same time always exists. According to the single-inlet multi-outlet type water cooling crystallizer developed by the invention, the optimal electroslag ingot surface quality and the optimal electroslag ingot internal quality are obtained at the same time.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to an electroslag remelting device and a use method of a single-inlet and multi-outlet water-cooled crystallizer. Background technique [0002] As the diameter of electroslag ingots and the content of elements in alloy steel continue to increase, improving the center segregation of large-size electroslag ingots and refining the grain size are important ways to produce large-size forgings. Electroslag remelting is an equipment process for producing large-size forgings and high-alloy steels. Although the quality of electroslag ingots has been improved to a certain extent, problems such as solidification segregation and coarse grains still exist in the center of large-size electroslag ingots. Especially for large-scale electroslag ingots such as stainless steel, nickel-based alloys, and tool and die steels, element segregation and harmful precipitation dur...

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Problems solved by technology

[0004] Although electroslag remelting in the prior art can increase the solidification rate of molten steel compared with continuous casting slabs, there are still relatively serious solidification segregation and coarse grains in the solidification process for large-sized electroslag ingots of high-alloy steel types. Especially for electroslag ingots with electroslag remelting diameter greater than 60cm, the solidification rate of the molten metal pool and the surface quality of electroslag ingots have an inverse relationship

In addition, by optimizing the cooling intensity of the water-cooled crystallizer, although a better internal quality can be obtained under the premise of ensuring the surface quality of the electroslag ingot, its internal quality still cannot meet the requirements of large-scale electroslag ingots and high-performance products

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