Device and method for refining high-end bearing steel by electromagnetically controlling electroslag

A technology of electroslag refining and electromagnetic control, which is applied in the field of metallurgy, can solve the problems of reducing the surface quality of ingots and affecting production efficiency, and can improve the solidification structure of ingots, inhibit the formation of coarse columnar crystals, and strengthen convective cooling and heat transfer conditions. Effect

Active Publication Date: 2019-11-26
HEBEI IRON AND STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the electroslag remelting process, reducing the melting rate will affect the production efficiency and reduce the surface quality of the ingot

Method used

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  • Device and method for refining high-end bearing steel by electromagnetically controlling electroslag
  • Device and method for refining high-end bearing steel by electromagnetically controlling electroslag
  • Device and method for refining high-end bearing steel by electromagnetically controlling electroslag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Electroslag refining consumable electrode is φ200×2000mm bearing steel, with 60%CaF 2 , 20%CaO, 18%Al 2 o 3 , 2% MgO slag material is used as the electroslag component, the refining melting rate is controlled by a constant melting rate of 240kg / h, the lifting speed of the electromagnetic crystallizer is X=7.26mm / min, and the crystallizer is a φ300×750mm electromagnetic crystallizer. Electroslag is carried out under the conditions of 2Hz-100A, 4Hz-150A, and 6Hz-300A. The specific process is that after the slag is melted, the electromagnetic control system is turned on, and the constant melting rate electroslag is automatically controlled by the PLC, and the mold lifting method is adopted to ensure that the metal molten pool is always located at the center of the electromagnetic stirring of the mold. The smelting is carried out under the slag pool, and the oxygen content in the upper part of the slag pool is less than 80ppm. See Table 1 for details.

[0043] Table 1 E...

Embodiment 2

[0047] Electroslag refining consumable electrode is φ220×1800mm bearing steel, with 55%CaF 2 , 25%CaO, 17%Al 2 o 3 , 3% MgO slag material is used as the electroslag component, the refining melting rate is controlled by constant melting rate 210kg / h, the lifting speed of the electromagnetic crystallizer is X=6.35mm / min, and the crystallizer is φ300×750mm electromagnetic crystallizer, respectively in the absence of magnetic field, Electroslag is carried out under the conditions of 1Hz-50A, 3Hz-150A and 6Hz-200A. The specific process is that after the slag is melted, the electromagnetic control system is turned on, and the constant melting rate electroslag is automatically controlled by the PLC, and the mold lifting method is adopted to ensure that the metal molten pool is always located at the center of the electromagnetic stirring of the mold. The smelting is carried out under the slag pool, and the oxygen content in the upper part of the slag pool is less than 100ppm. See T...

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Abstract

The invention relates to a device and method for refining high-end bearing steel by electromagnetically controlling electroslag, and belongs to the technical field of metallurgy. According to the technical scheme, electromagnetic energy is converted into molten steel kinetic energy, a rotating magnetic field is applied into an electromagnetic crystallizer, so that convection cooling between metaland the crystallizer is strengthened; and an induction coil and a liquid level monitoring device are arranged inside the electromagnetic crystallizer. The device and method for refining the high-end bearing steel by electromagnetically controlling the electroslag has the beneficial effects that convection movement around a metal molten pool before solidification is effectively improved, solute enriched liquids between the molten pool and solid dendritic crystals are mutually scoured and mixed so as to reduce the concentration gradient, so that element segregation is reduced; and meanwhile, through convection heat transfer generated by molten steel flowing, convection cooling and heat transfer conditions of metal molten steel and the crystallizer are reinforced, heat transfer efficiency ofmolten steel to a crystallizer water cooling copper pipe is greatly improved so that segregation can be reduced, net carbide precipitation can be eliminated, formation of coarse columnar crystals in the molten steel solidification process can be inhibited, and production of the high-end bearing steel through an electroslag furnace is achieved.

Description

technical field [0001] The invention relates to an electromagnetically controlled electroslag refining device and method for high-end bearing steel, which belongs to the technical field of metallurgy. Background technique [0002] Bearing steel is used to manufacture balls, rollers and bearing rings. Bearings are under great pressure and friction during work, so bearing steel is required to have high and uniform hardness, wear resistance and elastic limit. The uniformity of the chemical composition of bearing steel, the content and distribution of non-metallic inclusions, and the distribution of carbides are very strict, and it is one of the most stringent steel types in all steel production. Carbide is an important part of the structure of bearing steel. Due to the relatively high content of alloys such as carbon and chromium in bearing steel, large-sized carbides will be formed if the cooling is insufficient during the solidification of molten steel, which will significant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18C22B9/187C22C33/04
CPCC22B9/18C22C33/04Y02P10/25
Inventor 张福利牟瑞宇王育飞徐于斌
Owner HEBEI IRON AND STEEL
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