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Electroslag remelting method for difficult-processing high alloy stainless steel and electroslag remelting slag system adopting electroslag remelting method

A technology of electroslag remelting and electroslag slag system, applied in the field of metallurgical smelting, can solve the problems of poor hot workability of high-alloy stainless steel, scrapped forgings, etc., to improve processing performance, improve yield, and promote industrial progress and economy. effect of development

Inactive Publication Date: 2013-02-13
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of the content of alloying elements, especially the addition or increase of elements such as Cr, Mo, Cu, N, etc., the hot workability of high-alloy stainless steel is significantly deteriorated, making it easy to form on the grain boundary under unsuitable thermal deformation conditions. Precipitation of low-melting point compounds or brittle phases, and become the origin of micro-cracks, in the subsequent thermal processing, the cracks will expand more and more, resulting in the scrapping of forgings

Method used

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  • Electroslag remelting method for difficult-processing high alloy stainless steel and electroslag remelting slag system adopting electroslag remelting method

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preparation example Construction

[0029] (1) Preparation of self-fusing electrode rod

[0030] The ingredients of high-alloy stainless steel self-fluxing electrode rods are by weight percentage: Cr: 20-25%, Ni: 15-25%, Mo: 5-8%, Cu: 0.1-1%, N: 0.2-0.3%, Fe :margin. After vacuum induction melting, it is cast into a round bar, and after the surface of the round bar is sanded and finished, it is a self-melting electrode rod for electroslag remelting.

[0031] (2) Electroslag remelting

[0032] The ratio of slag material for electroslag remelting is as shown in Table 1. Heat the pre-prepared slag to a molten state, pour it into a copper crystallizer, cool the crystallizer and the bottom plate with water, slowly lower the prepared self-fluxing electrode rod and insert it into the molten slag, and after energization and arcing , adjust the remelting voltage to 38-60V, and the current to 3000-12000A. The self-fusing electrode rod is slowly melted by resistance heat, and the melted self-fusing electrode rod dr...

Embodiment 1

[0037] Electroslag remelting slag system ratio by weight: fluorite (CaF 2 ): 5.04kg, lime (CaO): 1.05kg, alumina (Al 2 o 3 ): 0.7kg, magnesium oxide (MgO): 0.21kg. Slag-based impurities content (weight percent): SiO 2 : 0.25%, TiO 2 : 0.3%, FeO: 0.3%, C: 0.02%, P: 0.005%, S: 0.03%.

[0038] The ingredients of the high-alloy stainless steel self-fusing electrode rod are as follows by weight: Cr: 22%, Ni: 24%, Mo: 8%, Cu: 1%, N: 0.3%, Fe: 44.7%, the total amount is 30kg, after Vacuum induction melting, casting into a round rod with a diameter of 110mm, after the surface is sanded and finished, it is used as a self-melting electrode rod for electroslag remelting.

[0039]Heat the above slag to a molten state, pour it into a crystallizer with a diameter of 160mm, slowly drop the self-melting electrode rod into the molten electroslag remelting slag, and adjust the remelting voltage to 42V and current to about 3000A after arcing. The self-fusing electrode is slowly melted by r...

Embodiment 2

[0042] Electroslag remelting slag system ratio by weight: fluorite (CaF 2 ): 3.68kg, lime (CaO): 2.24kg, alumina (Al 2 o 3 ): 1.92kg, magnesium oxide (MgO): 0.16kg. Slag-based impurities content (weight percent): SiO 2 : 0.3%, TiO 2 : 0.25%, FeO: 0.2%, C: 0.015%, P: 0.003%, S: 0.015%.

[0043] The ingredients of the high-alloy stainless steel self-fusing electrode rod are as follows by weight: Cr: 21%, Ni: 22.5%, Mo: 5%, Cu: 0.3%, N: 0.3%, Fe: 50.9%, the total amount is 50kg, after Vacuum induction melting, casting into a round rod with a diameter of 100mm, after the surface is sanded and finished, it is used as a self-melting electrode rod for electroslag remelting.

[0044] Heat the above slag to a molten state, pour it into a crystallizer with a diameter of 160mm, slowly lower the self-melting electrode rod into the molten electroslag remelting slag, and adjust the remelting voltage to 45V and current to about 3000A after arcing. The self-fusing electrode is slowly me...

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Abstract

The invention relates to an electroslag remelting method for difficult-processing high alloy stainless steel and an electroslag remelting slag system adopting the electroslag remelting method. The slag system comprises the components in parts by weight: 46-72 parts of CaF2, 15-28 parts of CaO, 24-10 parts of Al2O3 and 8-2 parts of MgO, wherein the content of impurities is less than 1.0%. The electroslag remelting slag system and the electroslag remelting method reduce the contents of harmful elements in steel, improve the purity, optimize the organization, particularly and remarkably improve the processing performance of the difficult-processing high alloy stainless steel and greatly improve the material yield.

Description

technical field [0001] The invention relates to the field of metallurgical smelting, in particular to an electroslag remelting method for refractory high-alloy stainless steel and an electroslag remelting slag system used in the method. Background technique [0002] Compared with the existing ordinary stainless steel, high-alloy stainless steel has higher content of elements such as Cr, Ni, Mo, Cu, N, etc., because it has good mechanical and physical properties and excellent corrosion resistance, and can undergo cold and hot deformation and Welding process is used to produce materials of different shapes, which are often used in occasions where corrosion requirements are relatively harsh and ordinary stainless steel cannot bear, such as high-concentration chloride ion medium or seawater or even deep-sea environment, flue gas desulfurization environment of high-sulfur coal-fired factories, in It can be used as an economical substitute for nickel-based alloys in some marine an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18
CPCY02P10/25
Inventor 刘海定王东哲魏捍东万红李济林陈登华罗维凡王方军
Owner CHONGQING MATERIALS RES INST
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