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A Remelting Process for Eliminating Type Segregation of Electroslag Steel Ingots

A technology for electroslag remelting furnace and steel ingot, applied in the field of electrometallurgy of black metal materials, can solve the problems of accidents, leakage of steel materials, no ingot segregation production process, etc., and achieves good safety, low steel cost and good market. Foreground effect

Active Publication Date: 2017-11-10
宝武特冶航研科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the steel with ingot segregation defects did not cause significant deterioration of the mechanical properties of the steel, these steels with ingot segregation defects are used for some special-purpose parts that require strict ingot segregation, such as high-pressure airtight structural components When the alloy elements segregate, the steel material will leak air, and serious accidents will occur, resulting in unimaginable consequences.
However, there is no relevant production process for eliminating ingot shape segregation in the prior art

Method used

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  • A Remelting Process for Eliminating Type Segregation of Electroslag Steel Ingots
  • A Remelting Process for Eliminating Type Segregation of Electroslag Steel Ingots
  • A Remelting Process for Eliminating Type Segregation of Electroslag Steel Ingots

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 Change input voltage fluctuation

[0028] Table 1 Influence of input voltage fluctuation on ingot shape segregation

[0029]

[0030] Through research, the present invention finds that the fluctuation of the input voltage will cause the fluctuation of the output voltage, that is, the fluctuation of the smelting voltage. The larger the ingot shape segregation is, the more serious it is. It can be seen from the above table 1 that when the input voltage fluctuates greatly, the phenomenon of ingot shape segregation at the head and tail of the steel ingot is obvious, and the number of unqualified furnaces reaches more than half, and the greater the input voltage fluctuation, the more serious the ingot shape segregation; And adopt the method of the present invention to control input voltage fluctuation ≤ 40V, the unqualified furnace number is 0, the electroslag steel head and tail of electroslag remelting do not appear the phenomenon of ingot type segregation...

Embodiment 2

[0031] Embodiment 2 Change the current value

[0032] Table 2 Effect of current value on ingot shape segregation

[0033]

[0034]

[0035] The invention adopts high voltage and low current parameters through research and development, and can obtain a flat metal molten pool in the process of electroslag remelting, create conditions for solidification and crystallization, and eliminate ingot shape segregation. It can be seen from the above table 2 that when the remelting current is 6100-6500A, the remelting process can be guaranteed to be stable without ingot shape segregation, while other currents will cause ingot shape segregation.

Embodiment 3

[0036] Embodiment 3 changes the slag system

[0037] Table 3 The effect of the change of slag system on the segregation of ingot shape

[0038]

[0039] As can be seen from Table 3 above, the use of CaF 2 :60~70 parts, Al 2 o 3 : 15 to 25 parts and CaO15 to 25 parts of heavy slag, the melting point of the proportion of slag is lower at about 1230 ° C, the melting process is stable, easy to form, has greater overheating and good fluidity, under the action of current It can generate higher slag temperature and effectively suppress the generation of ingot shape segregation.

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Abstract

The invention provides a remelting technique for eliminating pattern segregation of electroslag steel. The remelting technique for eliminating the pattern segregation of the electroslag steel comprises the steps that firstly, remelting slag is prepared from, by weight, 60-70 parts of CaF2, 15-25 parts of Al2O3 and 15-25 parts of CaO, and the remelting slag is poured into a slag bath after being baked at the temperature of 700-800 DEG C for 7-10 hours; alloy steel is inserted into the remelting slag by serving as a consumable electrode; an electroslag remelting furnace is assembled; and the electroslag remelting furnace is powered on, electroslag remelting is started after arcing, the input voltage fluctuation of the electroslag remelting furnace is controlled to be smaller than or equal to 40 V, the remelting voltage is controlled to be 48-52 V, the current is controlled to be 6100-6500 A, the water outlet temperature of cooling water at the bottom of a crystallizer is controlled to be lower than or equal to 50 DEG C, and the inlet and outlet temperature difference of the cooling water at the bottom of the crystallizer is controlled to be 10-20 DEG C. Pattern segregation of an electroslag ingot prepared through the method is basically eliminated, and the prepared electroslag ingot is suitable for the special components, such as steel for high-pressure airtight structures, having strict pattern segregation requirements and has good safety performance.

Description

technical field [0001] The invention belongs to the technical field of electrometallurgy of black metal materials, and relates to a remelting process for eliminating segregation of electroslag steel ingots. Background technique [0002] Ingot shape segregation is a low-magnification defect of electroslag remelting steel. It is due to the simultaneous process of metal melting and solidification in the process of electroslag remelting, and the temperature of molten steel fluctuates with process parameters such as voltage, current, and cooling water flow rate. It is caused by the corresponding change of the crystallization speed; in the crystallization process of the steel ingot, due to the influence of the crystallization law, the edge of the ingot mold forms a columnar crystal region, and the center of the ingot is an equiaxed crystal region. Composition segregation and accumulation of impurities are easily formed at the junction of the crystal region and the equiaxed crystal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/18
CPCC22B9/18
Inventor 秦洪伟
Owner 宝武特冶航研科技有限公司