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Refining agent for atmosphere protected electro-slag re-melting

A technology of electroslag remelting and refining agent, applied in the field of electroslag remelting, can solve the problems of difficulty in dissolved oxygen, restriction of purity of alloy products, poor stability, etc., to improve metallurgical quality, reduce the content of non-metallic inclusions, high efficiency effect

Inactive Publication Date: 2011-08-10
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the atmosphere-protected electroslag remelting process, due to the inert atmosphere protection used in the entire electroslag remelting process, the electroslag remelting system is relatively closed, and there is no effective way to add refining agents, which restricts alloy products. Further improvement in purity
In addition, at the working temperature of electroslag remelting, since the dissolved aluminum, calcium and dissolved oxygen in the alloy liquid have reached equilibrium, if the content of dissolved aluminum and calcium cannot be increased, it is difficult to further reduce the dissolved oxygen.
In addition, since the specific gravity (or density) of metal aluminum and calcium are 2.7g / cm 3 and 1.54g / cm 3 , they are all lower than or close to the specific gravity of the slag system used in electroslag remelting (about 2.7 ~ 2.8g / cm 3 ), and due to the problem of poor stability due to gasification of metal calcium at high temperature, it is difficult for metal aluminum and calcium to enter the slag system to stably complete the refining process of the alloy liquid

Method used

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  • Refining agent for atmosphere protected electro-slag re-melting
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Examples

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Effect test

Embodiment 1

[0037] In this example, the raw material to be refined is H13 steel, and its specific gravity is about 7.8g / cm 3 , the total oxygen content is 30ppm, the sulfur content is 88ppm, and the phosphorus content is 120ppm. H13 steel is a hot work die steel, which implements the standard GB / T1299-2000. The slag is composed of 60% calcium fluoride (CaF 2 ), 20% calcium oxide (CaO) and 20% aluminum oxide (Al 2 o 3 ) composition, at 1600°C, the specific gravity of the slag is about 2.7g / cm 3 . Mix metal calcium powder, metal aluminum powder, H13 steel powder and slag in a ratio of 1:1:3:1 by weight, then put it into a designated mold, and use a cold isostatic press to extrude at a pressure of 150MPa for 1 Hours, after forming, it is baked under argon protection at 700°C for 24 hours to form a granular refining agent with a particle size of 0.1mm. In this example, the specific gravity of the prepared refining agent is 3g / cm 3 . The specific gravity value is greater than the speci...

Embodiment 2

[0040] In this example, the raw material to be refined is H13 steel, and its specific gravity is about 7.8g / cm 3 , the total oxygen content is 30ppm, the sulfur content is 70ppm, and the phosphorus content is 100ppm. Slag consists of 70% CaF 2 and 30% Al 2 o 3 composition, at 1600°C, the specific gravity of the slag is about 2.8g / cm 3 . Mix metal calcium powder, metal aluminum powder, H13 steel powder and slag in a ratio of 2:1:5.3:1 by weight, then put it into a designated mold, and use a cold isostatic press to extrude at 180MPa for 1 Hours, after forming, it is baked under argon protection at 700°C for 24 hours to form a granular refining agent with a particle size of 10mm. In this example, the specific gravity of the prepared refining agent is 5g / cm 3 . The specific gravity value is greater than the specific gravity of the slag liquid in the electroslag remelting process and smaller than the specific gravity of the alloy liquid formed from the molten H13 steel after...

Embodiment 3

[0043] In this example, the raw material to be refined is S136 steel, and its specific gravity is about 7.8g / cm 3 , the total oxygen content is 28ppm, the sulfur content is 62ppm, and the phosphorus content is 92ppm. Slag consists of 60% CaF 2 , 20% CaO and 20% Al 2 o 3 Composition, at 1600°C, the specific gravity of the slag is 2.7g / cm 3 . Mix metal calcium powder, metal aluminum powder, S136 steel powder and slag according to the ratio of 1:2:6.6:0.8 by weight, then put it into a designated mold, and use a cold isostatic press to extrude 1.2 Hours, after forming, it is baked under argon protection at 720°C for 24 hours to form a granular refining agent with a particle size of 3mm. In this example, the specific gravity of the prepared refining agent is 6g / cm 3 . The specific gravity value is greater than the specific gravity of the slag liquid in the electroslag remelting process and smaller than the specific gravity of the alloy liquid formed by melting the S136 steel...

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Abstract

The invention provides a refining agent for atmosphere protected electro-slag re-melting. The refining agent comprises aluminum metal, calcium metal and electro-slag, wherein the specific gravity of the refining agent is greater than that of molten slag and smaller than that of molten alloy. The refining agent for the atmosphere protected electro-slag re-melting can be used for refining various products suitable for electro-slag re-melting process treatment such as carbon steel, alloy constructional steel, bearing steel, die steel, high-speed steel, stainless steel, heat resistant steel, ultrahigh-strength steel, high-temperature alloy, precision alloy, anticorrosive alloy, electric heating alloy and the like. The refining agent can effectively reduce the content of impurity elements such as O, S, P and the like of an alloy product on the premise that the conventional atmosphere protected electro-slag re-melting production process is not affected, can reduce nonmetallic inclusion content of the alloy and does not introduce new impurity elements, so as to improve the metallurgical quality of the alloy product.

Description

technical field [0001] The invention relates to the technical field of electroslag remelting, in particular to a refining agent used in an atmosphere protection electroslag remelting process. Background technique [0002] When the traditional electroslag remelting process is used for smelting, the consumable electrode and the slag liquid surface are exposed to the air, the high temperature generated by the electroslag oxidizes the surface of the consumable electrode, and the generated FeO transfers oxygen to the alloy liquid; the FeO in the slag is exposed In air, it is oxidized to Fe 2 o 3 , Fe 2 o 3 Entering the slag phase to transfer oxygen to the alloy liquid will eventually lead to an increase in the total oxygen content of the electroslag alloy ingot, and the original impurity elements such as S and P are difficult to control to the ideal range. [0003] Compared with the traditional electroslag remelting process, when the atmosphere protection electroslag remeltin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/10C22B9/18
Inventor 陈希春付锐任昊
Owner CENT IRON & STEEL RES INST
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