Electroslag remelting fluoride-free slag and electroslag remelting method thereof

A technology for electroslag remelting and metal remelting, applied in the fields of electroslag remelting fluorine-free slag and electroslag remelting, it can solve the problem of environmental pollution caused by the stability of the remelting process, affecting the surface finish of steel ingots, uneven thickness of ingots, etc. problems, to achieve the effect of shortening arc starting time and difficulty, suitable cooling and solidification rate, and small degree of ingot segregation

Active Publication Date: 2016-07-20
宝武特冶航研科技有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: the fluorine-containing slag in the prior art affects the stability of the remelting process, pollutes the environment, and endangers human health, while the fluorine-free slag has a high melting point and a high conductivity. Low, difficult to ignite, using the existing fluorine-free slag for electroslag remelting to obtain the technical problem of uneven thickness of the ingot, which seriously affects the surface finish of the steel ingot, and provides a method that can reduce environmental pollution and ensure Electroslag remelting electroslag remelting fluoride-free slag with good shape, smooth surface, small degree of ingot segregation, dense and uniform structure, and low gas content and its use in electroslag remelting

Method used

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  • Electroslag remelting fluoride-free slag and electroslag remelting method thereof

Examples

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Effect test

Embodiment 1

[0024] Embodiment 1 Electroslag remelting produces 30CrMnSiA alloy

[0025] An electroslag remelting fluorine-free slag, comprising the following components by weight: 50 parts of CaO, 40 parts of Al 2 o 3 , 7 parts of MgO and 3 parts of SiO 2 .

[0026] The 30CrMnSiA alloy steel is produced by remelting the above-mentioned electroslag remelting without fluorine slag, and the specific method is as follows:

[0027] 1) Weigh the raw materials according to the above electroslag remelting fluorine-free slag, according to Al 2 o 3 →CaO→SiO 2 →The loading order of MgO is loaded into the slag box, and baked at 800°C for 8 hours to fully remove the moisture in the slag.

[0028] 2) Weld the ∮240mm 30CrMnSiA consumable electrode blank on the dummy electrode;

[0029] 3) Start the arc with a graphite electrode to ignite the fluorine-free slag. The operator observes the melting of the slag in the crystallizer. After the color in the furnace becomes bright, it melts for another 9 ...

Embodiment 2

[0032] Embodiment 2 Electroslag remelting produces 0Cr18Ni9 alloy

[0033] An electroslag remelting fluorine-free slag, comprising the following components by weight: 48 parts of CaO, 42 parts of Al 2 o 3 , 5 parts of MgO and 5 parts of SiO 2 .

[0034] The 0Cr18Ni9 alloy is produced by remelting the above-mentioned electroslag remelting fluorine-free slag, and the specific method is as follows:

[0035] 1) Weigh the raw materials according to the above electroslag remelting fluorine-free slag, according to Al 2 o 3 →CaO→SiO 2 →The order of loading MgO is loaded into the slag box, and baked at 900°C for 10 hours to fully remove the moisture in the slag.

[0036] 2) Weld the ∮240mm 0Cr18Ni9 consumable electrode blank on the dummy electrode;

[0037] 3) Start the arc with a graphite electrode to ignite the fluorine-free slag. The operator observes the melting of the slag in the crystallizer. After the color in the furnace becomes bright, it melts for another 10 minutes. L...

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Abstract

The invention provides electroslag remelting fluoride-free slag and an electroslag remelting method thereof. The fluoride-free slag is prepared from, by weight, 45-55 parts of CaO, 35-45 parts of Al2O3, 5-10 parts of MgO and 2-5 parts of SiO2. The method comprises the steps that the fluoride-free slag is baked, an electroslag remelting furnace is assembled, the baked fluoride-free slag and a deoxidizing agent are added into a crystallizer of the electroslag remelting furnace for arcing, a graphite electrode is used for arcing and slagging, then the graphite electrode is replaced with a consumable electrode for melting, the voltage is set from 51 V to 54 V, the current is set from 7700 A to 8100 A, electricity is supplied for remelting melt, and aluminum powder is added in the remelting process for deoxygenation. The fluoride-free slag can reduce pollution produced to the environment in the electroslag remelting process, and meanwhile it can be ensured that an electroslag remelting ingot is good in molding, smooth and clean in surface, small in segregation degree, tight and uniform in structure and low in gas content.

Description

technical field [0001] The invention belongs to the technical field of electrometallurgy of ferrous metal materials, relates to the technical field of electrometallurgy, and in particular relates to an electroslag remelting fluorine-free slag and a method for electroslag remelting thereof. Background technique [0002] As we all know, steelmaking by electroslag remelting is one of the important means to produce high-quality alloy steel and alloys. The selection of heavy slag plays a very important role in the process of electroslag remelting. It can also control the chemical composition of metals, refine molten steel, and remove non-metallic inclusions. AHΦ-6 slag (CaF 2 70%+Al 2 o 3 30%). Currently commonly used CaF 2 The high-fluorine remelting slag based on fluorine has high specific conductivity, insufficient calorific value of slag, unstable slag composition in the remelting process, and then affects the stability of the remelting process. It contains a large amoun...

Claims

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Application Information

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Patent Type & Authority Applications(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
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