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Hollow electroslag remelting consumable electrode as well as preparation method and electroslag remelting method thereof

A consumable electrode, electroslag remelting technology, 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. The effect of increasing inclusions and increasing gas flow

Active Publication Date: 2021-02-02
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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  • Hollow electroslag remelting consumable electrode as well as preparation method and electroslag remelting method thereof
  • Hollow electroslag remelting consumable electrode as well as preparation method and electroslag remelting method thereof
  • Hollow electroslag remelting consumable electrode as well as preparation method and electroslag remelting method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for preparing a hollow electroslag remelted consumable electrode, the steps are as follows:

[0037] 1) Configure the raw materials of the main body of the consumable electrode according to the types and contents of the elements required for the alloy ingot to be prepared corresponding to the consumable electrode and carry out alloying smelting. When the temperature of the molten steel reaches 1560-1580°C, the steel is tapped. The molten steel is poured to form a hollow electroslag remelting self-consumable electrode;

[0038] 2) Homogenize the consumable electrode poured in step 1) at 1200° C. for 9 hours to obtain the hollow electroslag remelted consumable electrode.

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

Embodiment 2-9

[0041] Embodiment 2-9 provides a method for preparing a hollow electroslag remelting consumable electrode. Compared with embodiment 1, the difference is 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 table below.

[0042]

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

Embodiment 10

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

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

[0047] The following method is used to carry out electroslag remelting of GH37 alloy, including the following steps:

[0048] S1. Heat and bake the above-mentioned remelting and refining slag at 800°C for 10 hours, use the above-mentioned GH37 alloy as the consumable electrode, assemble the electroslag remelting furnace, and slowly lower and insert the hollow electroslag remelting consumable electrode In the slag of the electroslag furnace, the deoxidizer and the remelted refining slag baked in step 1) are added to the special slag meltin...

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Abstract

The invention discloses a hollow electroslag remelting consumable electrode as well as a preparation method and an electroslag remelting method thereof. The consumable electrode comprises a hollow rodbody, wherein the axis of the hollow rod body extends in the front-back direction; and further, the upper end of the hollow rod body is reduced. By introducing argon from the hollow part of the consumable electrode, the problem of gas suction in an electroslag metallurgical process is solved; air in a crystallizer in an electroslag remelting refining process can be effectively isolated; by forming a favorable gas shielding layer, the secondary intake of molten steel to various gas contents during a remelting period is effectively reduced; and further, the increase of inclusions in steel due to the influences of various factors is reduced, so that the internal quality of a final electroslag steel ingot is improved. Meanwhile, by using the consumable electrode, the structure of an electroslag remelting furnace can be simplified, so that the sealing performance of the electroslag remelting furnace is improved, the internal space of the crystallizer is filled with a shielding gas to formthe favorable gas shielding layer; the shielding gas is fully utilized; and the loss of the shielding gas is reduced.

Description

technical field [0001] The invention relates to the technical field of electroslag metallurgy, in particular to a hollow electroslag remelting consumable electrode, a preparation method thereof, and an electroslag remelting method. Background technique [0002] Electroslag remelting technology is a means of smelting 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 needs of smelting. High temperature and the heat required to supplement chemical reactions. And through the resistance heat of the slag to melt the consumable electrode, the metal droplet passes through the slag layer to form a molten pool, and recrystallizes and solidifies into a steel ingot in the crystallizer, and with its excellent reaction conditions and The special crystallization method has advantages that c...

Claims

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Application Information

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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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