A hollow electroslag remelting consumable electrode and its preparation method and electroslag remelting method

A technology for electroslag remelting and consumable electrodes, applied in the field of electroslag metallurgy, can solve the problems of poor sealing performance of electroslag remelting furnace, uneven distribution of inert gas, rapid temperature drop of molten steel, etc., so as to reduce the loss of protective gas and reduce The effect of increasing inclusions and increasing gas flow

Active Publication Date: 2022-07-29
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing electroslag remelting process needs to set air inlet holes on the furnace body of the electroslag remelting furnace to feed inert gas into the furnace body. The above method has uneven distribution of inert gas and poor sealing of the electroslag remelting furnace , resulting in a rapid drop in molten steel temperature, a heat source must be provided to ensure the argon blowing time
[0004] Therefore, it is urgent to provide a hollow electroslag remelting self-consumable electrode and its preparation method and electroslag remelting method to solve the gas absorption problem in the electroslag metallurgy process

Method used

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  • A hollow electroslag remelting consumable electrode and its preparation method and electroslag remelting method
  • A hollow electroslag remelting consumable electrode and its preparation method and electroslag remelting method
  • A hollow electroslag remelting consumable electrode and its preparation method and electroslag remelting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method of a hollow electroslag remelting consumable electrode, the steps are as follows:

[0037] 1) According to the type and content of each element required for the alloy ingot to be prepared corresponding to the consumable electrode, configure the raw materials for the main body of the consumable electrode and carry out alloying smelting. The molten steel is poured to form a hollow electroslag remelting consumable electrode;

[0038] 2) Homogenizing the consumable electrode casted in step 1) at 1200° C. for 9 hours to obtain the hollow electroslag remelting consumable electrode.

[0039] The diameter of the electroslag remelting consumable electrode prepared in this example is 600 mm; the hollow hole diameter of the hollow rod body is 50 mm.

Embodiment 2-9

[0041] Embodiments 2-9 provide a preparation method of a hollow electroslag remelting consumable electrode. Compared with Embodiment 1, the difference lies in that the diameter of the consumable electrode and the size of the hollow hole of the hollow rod are changed. , except for the above differences, other operations are the same, and will not be repeated here; the specific experimental conditions parameters and test results are shown in the following table.

[0042]

[0043] It can be seen from the results in the above table that when the diameter of the consumable electrode made by casting is 50-1000mm, the hardness of the prepared consumable electrode is 29-35HSD, which shows that the hollow electroslag remelting consumable prepared by the present invention is consumable. The electrode has higher hardness; and compared with the electroslag remelting consumable electrode without a hollow structure prepared in Example 9, the consumable electrode prepared in the embodiment...

Embodiment 10

[0045]In this example, GH37 alloy is used as the consumable electrode, the size of the consumable electrode blank is ∮500mm, and the size of the mold is ∮600mm.

[0046] The remelting refining slag with the following components by weight is selected: CaF 2 50 parts, Al 2 O 3 20 parts, CaO 15 parts, TiO 2 10 parts and 5 parts MgO. Among them, CaF 2 , Al 2 O 3 , CaO, TiO 2 The mass content of SiO2 in both MgO and MgO is less than or equal to 1.0%.

[0047] Electroslag remelting of GH37 alloy is carried out by the following method, including the following steps:

[0048] S1. The above-mentioned remelting refining slag is kept and baked at 800°C for 10 hours. The above-mentioned GH37 alloy is used as the consumable electrode, and the electroslag remelting furnace is assembled, and the hollow electroslag remelting consumable electrode is slowly lowered and inserted into the In the slag of the electroslag furnace, the deoxidizer and the remelted refining slag baked in st...

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Abstract

The invention discloses a hollow electroslag remelting consumable electrode, a preparation method thereof, and an electroslag remelting method. The consumable electrode comprises a hollow rod body with an axis extending in the front-rear direction, and the upper end of the hollow rod body is Reduced diameter. By feeding argon gas from the hollow of the consumable electrode, the problem of inhalation in the electroslag metallurgy process can be solved, and the air in the mold during the electroslag remelting refining process can be effectively isolated, and a good gas protective layer can be formed by forming a good gas protective layer. , effectively reducing the re-intake of various gas contents by molten steel during remelting, thereby reducing the increase of inclusions in the steel caused by various factors, so as to improve the internal quality of the final electroslag ingot. At the same time, the invention can simplify the structure of the electroslag remelting furnace to improve its sealing performance, and make the protective gas fill the inner space of the crystallizer to form a good gas protective layer, so that the protective gas can be fully utilized and the loss of protective gas can be reduced.

Description

technical field [0001] The invention relates to the technical field of electroslag metallurgy, in particular to a hollow electroslag remelting consumable electrode and a preparation method thereof and an electroslag remelting method. Background technique [0002] Electroslag remelting technology is a means of refining high-quality steel ingots. Its working principle is to insert electrodes into the charge for submerged arc operation, use the energy and current of the arc to pass through the charge, and generate energy due to the resistance of the charge to meet the smelting requirements. High temperature and heat needed to supplement chemical reactions. And through the resistance heat of the slag to melt the consumable electrode, the metal droplets pass through the slag layer to form a molten pool, and recrystallize and solidify into a steel ingot in the mold, and with its excellent reaction conditions and The special crystallization method has the advantages that other ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/18C22B9/187
CPCC22B9/18
Inventor 周建安王宝王怡
Owner WUHAN UNIV OF SCI & TECH
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