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Preparation method of low-silicon pre-melted slag for electroslag remelting

A technology of electroslag remelting and pre-melting slag, which is applied in the field of preparation of low-silicon pre-melting slag for electroslag remelting, can solve the problems of affecting the quality of alloy metallurgy, unfavorable large-scale promotion, and poor practicability, etc., and achieves improvement Market competitiveness, remarkable effect of desiliconization, effect of improving product quality

Active Publication Date: 2017-07-11
NORTHEASTERN UNIV LIAONING
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Problems solved by technology

[0003] Fluorite and lime are necessary raw materials for the production of pre-slag, but due to SiO in raw materials such as fluorite and lime 2 Higher content, easy to lead to higher SiO content in the pre-slag 2 , so that when it is used to produce alloys containing Ti, Al and other easily oxidizable elements, it is very easy to cause a large amount of burning loss of Ti, Al and other elements, which seriously affects the metallurgical quality of this type of alloy, and the yield is extremely low, and the production cost is greatly increased. , so it is urgent to develop a method to effectively reduce SiO in pre-slag 2 content method
The Chinese patent with the publication number CN102277501A discloses a process for electroslag remelting of titanium-containing alloy steel. The process adds Al powder, Fe-Ti powder and CaF 2 The electroslag remelting process of powder mixture to prepare titanium-containing alloy steel can effectively solve the problem of a large amount of burning loss of Ti element in steel, but in this process, the process parameters such as electroslag remelting smelting process parameters and the amount of mixture added are controlled. Difficult, not practical
In addition, the process of using iron-aluminum rod electroslag remelting to purify the pre-slag can achieve the reduction of SiO in the pre-slag 2 content, but the single purification slag amount of this technology is small, the efficiency is low, and the cost is extremely high, which is not conducive to large-scale promotion

Method used

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  • Preparation method of low-silicon pre-melted slag for electroslag remelting

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Crush lime, fluorite and fused magnesia to 0mm~10mm, mix them with alumina powder uniformly to prepare slag, and dry it, wherein the slag includes CaO: 26 in mass percentage %, CaF 2 : 37%, Al 2 O 3 : 34.5%, MgO: 1.0%, SiO 2 : 0.95%, FeO: 0.15%, the rest are impurities. Weigh 600kg of slag into a 1600kg three-phase slag furnace; turn on the power, start the arc at a voltage of 35kV, after the current reaches a stable value (1.5kA), adjust the voltage and current to 49kV, 2.3kA, and 30kg 800kg of slag is added to it at a rate of / min, and the smelting time is 85min; all the slag is melted, and the temperature of the slag is controlled to 1590°C. The iron-aluminum alloy rod with 15% aluminum content by mass percentage is turned with a lathe to obtain iron-aluminum alloy scraps with a size of ≤50mm, and 47.04kg of iron-aluminum alloy scraps are added to the slag to make it evenly distributed on the surface of the slag pool. Stir uniformly; after smelting for 25 minutes at ...

Embodiment 2

[0040] Crush lime, fluorite and fused magnesia to 0mm~10mm, mix them with alumina powder uniformly to prepare slag, and dry it, wherein the slag includes CaO: 26 in mass percentage %, CaF 2 : 37%, Al 2 O 3 : 34.5%, MgO: 1.0%, SiO 2 : 0.95%, FeO: 0.15%, the rest are impurities. Weigh 550kg of slag into a 1600kg three-phase slag furnace; turn on the power supply, start the arc at a voltage of 35kV, after the current reaches a stable value (1.4kA), adjust the voltage and current to 49kV, 2.3kA, and 30kg Add 850kg of slag to it at a rate of / min, the smelting time is 85min, all the slag is melted, and the temperature of the slag is controlled to 1600°C. The iron-aluminum alloy rods with 15% aluminum content by mass percentage are turned with a lathe to obtain iron-aluminum alloy scraps with a size of ≤50mm. 49.28kg of iron-aluminum alloy scraps are added to the slag to make them evenly distributed on the surface of the slag pool. Stir uniformly; after smelting for 25 minutes at a ...

Embodiment 3

[0042] The lime, fluorite and fused magnesia are crushed to 0mm~10mm, mixed with alumina powder to prepare slag material, and dried, wherein the slag material includes CaO: 27 by mass percentage %, CaF2: 42%, Al2O3: 28%, MgO: 1.4%, iO2: 1.1%, FeO: 0.18%, and the rest are impurities. Weigh 550kg of slag into a 1600kg three-phase slag furnace; turn on the power, start the arc at 35kV, and after the current reaches a stable value (1.5kA), adjust the voltage and current to 48kV, 2kA, and 20kg / min 800kg of slag is added at a speed of, and the smelting time is 85min; all the slag is melted, and the temperature of the slag is controlled to 1570℃. The iron-aluminum alloy rod with 15% aluminum content by mass percentage is turned with a lathe to obtain iron-aluminum alloy scraps with a size of ≤50mm, and 59.4kg of iron-aluminum alloy scraps are added to the slag to make it evenly distributed on the surface of the slag pool. Stir uniformly; After smelting for 25 minutes under the condit...

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Abstract

The invention provides a method for preparing low-silicon pre-melted slag for electroslag remelting. The preparation method comprises the following steps: (1) mixing the slag; (2) melting the slag; (3) adding aluminum Ferroalloying and smelting. According to the preparation method of low-silicon pre-melting slag for electroslag remelting of the present invention, the requirements for equipment are relatively low, the operation is simple, easy to control, and the cost is low; it can effectively solve the problem of easily oxidized elements such as Al and Ti in the electroslag remelting process. The problem of burnout.

Description

Technical field [0001] The invention relates to the technical field of preparation of pre-melted slag for electroslag remelting, in particular to a method for preparing low-silicon pre-melted slag for electroslag remelting. Background technique [0002] Pre-melted slag is an important guarantee for electroslag remelting to produce high-quality special steel and high-end alloy materials. Compared with ordinary mixed slag materials for electroslag remelting, pre-melted slag has obvious characteristics such as uniform composition, low moisture absorption, and low melting point. Therefore, it can greatly reduce the difficulty of arcing slag and shorten slagging during use. Time, avoid the occurrence of slag collapse and other phenomena, thereby ensuring the safety and efficiency of the electroslag remelting process. At the same time, pre-melted slag can also effectively improve the quality of the bottom, surface and interior of the electroslag ingot, can effectively reduce the hydro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/18
Inventor 李花兵姜周华张树才任翠东李星刘国海董艳伍冯浩朱红春王琦张彬彬
Owner NORTHEASTERN UNIV LIAONING
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