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Slag for liquid pouring of electroslag

A technology of liquid casting and slag material, which is applied in the field of electroslag metallurgy, can solve the problems of unfavorable slag pool heat transfer steel ingot surface quality, secondary oxidation of molten steel, and low viscosity of slag material, so as to save preparation costs and enhance heat distribution. capacity and productivity improvement

Inactive Publication Date: 2010-11-24
SHENYANG DONGDA MATERIAL ADVANCED PREPARATION TECH ENG RES CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For electroslag liquid casting, the disadvantage of using traditional electroslag technology slag material is that it will cause secondary oxidation of molten steel, resulting in the burning of easily oxidized elements in steel during molten steel casting; while using continuous casting Mold slag, the viscosity of slag is low, which is not conducive to the heat transfer of the slag pool and the surface quality of the steel ingot

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The present invention selects above-mentioned slag composition ratio for use:

[0029] CaF 2 45%

[0030] CaO 20%

[0031] Al 2 o 3 20%

[0032] SiO 2 10%

[0033] MgO 5%

[0034] The electroslag ingot of 45# plain carbon steel is produced by electroslag liquid casting technology. The molten steel used in production is produced by electric furnace and converter, and then transferred to the tundish for use. The raw material of slag material is industrial materials. Granular (3 ~ 8mm), the amount of slag added is 30Kg per ton of steel. After the slag is melted in the conductive crystallizer using graphite electrodes, the molten steel is poured into the crystallizer and cast into steel ingots. After inspection, the quality of the steel ingots is comparable to that of traditional The quality of the electroslag steel ingot produced by the method is equivalent.

Embodiment 2

[0036] The present invention selects above-mentioned slag composition ratio for use:

[0037] CaF 2 40%

[0038] CaO 25%

[0039] Al 2 o 3 20%

[0040] SiO 2 10%

[0041] MgO 5%

[0042] The electroslag ingot of 45# plain carbon steel is produced by using electroslag liquid casting technology. The molten steel used in the production is produced by electric furnace and converter, and then transferred to the tundish for use. The slag material is made of industrial materials. After smelting, the slag material is broken into granules (3-8mm). The amount of slag added is 45Kg per ton of steel. into the crystallizer, and cast into steel ingots. After inspection, the quality of the steel ingots is equivalent to that of electroslag steel ingots produced by traditional methods.

Embodiment 3

[0044] The present invention selects above-mentioned slag composition ratio for use:

[0045] CaF 2 35%

[0046] CaO 20%

[0047] Al 2 o 3 30%

[0048] SiO 2 7%

[0049] MgO 8%

[0050] The electroslag ingot of 45# plain carbon steel is produced by electroslag liquid casting technology. The molten steel used in production is produced by induction furnace, and then transferred to the tundish for heat preservation. The slag material is made of industrial materials. After smelting, the slag material is broken into granules (3-8mm), and then the slag material is melted in a specific slag melting bag, and then the liquid slag is poured into the crystallizer, and then the The molten steel is poured into a conductive crystallizer and cast into a steel ingot. Similarly, after inspection, the steel ingot has passed the high and low magnification inspection, and the quality has reached the level of electroslag steel ingots.

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Abstract

The invention discloses slag for liquid pouring of electroslag, which belongs to the technical field of electroslag metallurgy. The slag comprises the following main components in percentage by weight: 35 to 45 percent of CaF2, 15 to 25 percent of CaO, 20 to 30 percent of Al2O3, 7 to 13 percent of SiO2 and 2 to 8 percent of MgO. A production method for the slag comprises the following steps of: putting raw materials, namely fluorite, industrial alumina, lime, quartz sand and magnesia, in a slag hearth; electrifying to arc and slag; after completely melting the slag, standing for 3 to 5 minutes and then cutting electricity; and leaning the hearth to pour the liquid slag into a slag disk (protective atmosphere) and cooling the liquid slag to obtain the slag. The slag has the advantages of changing the specific relation between a temperature parameter and electrical efficiency in the traditional electroslag remelting process, greatly enhancing the heat distribution capability between a control slag pool and a molten pool, providing the electrical efficiency and the thermal efficiency of a system, reducing the depth of the molten pool and contributing to obtaining uniform and fine tissues; moreover, the slag has the characteristic of continuous casting, and improves the production efficiency.

Description

technical field [0001] The invention belongs to the technical field of electroslag metallurgy, in particular to a slag material for electroslag liquid pouring. Background technique [0002] Electroslag remelting technology is an important means of producing a variety of high-end materials. However, electroslag remelting technology needs to prepare consumable electrodes, which not only wastes man-hours, but also increases the production cost of products. Based on traditional electroslag metallurgy technology, it has developed Electroslag liquid casting technology; [0003] Therefore, the electroslag liquid casting technology shows strong vitality and broad application prospects. The slag material mainly plays the role of heating body, refining and forming in the process of electroslag remelting. The electroslag ingot and the mold are relatively static. However, the electroslag liquid pouring technology has the characteristics of electroslag remelting and continuous casting, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D23/06C22B9/18C21C7/076
CPCY02P10/20
Inventor 姜周华董艳伍杨帆臧喜民沙骏
Owner SHENYANG DONGDA MATERIAL ADVANCED PREPARATION TECH ENG RES CENT
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