Ultrasound-electromagnetic continuous casting method for alloy steel

An alloy steel and ultrasonic technology is applied in the application field of ultrasonic-electromagnetic composite energy field in the solidification and forming process of high-temperature melts to achieve the effects of reducing attenuation, preventing corrosion and improving quality

Active Publication Date: 2017-03-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Introduce ultrasonic and electromagnetic fields into the steel melt at the same time, use electromagnetic fields to improve the quality of the surface area and subsurface area of ​​the ingot, and use ultrasonic waves to improve the quality of the ingot in the central area of ​​the ingot, and realize the continuous ultrasonic-electromagnetic composite energy field of alloy steel Casting technology has no precedent at home and abroad

Method used

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  • Ultrasound-electromagnetic continuous casting method for alloy steel
  • Ultrasound-electromagnetic continuous casting method for alloy steel
  • Ultrasound-electromagnetic continuous casting method for alloy steel

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Put 30 tons of smelted 35CrMo molten steel into the tundish after vacuum degassing treatment, add a certain amount of covering agent on the surface of the molten steel in the molten pool to keep the temperature of the molten steel at 1550°C to 1560°C.

[0027] After the molten steel is pulled out of the crystallizer with a dummy rod, the red billet passes through the electromagnetic stirrer body 2 in the secondary cooling section. When the billet drawing speed reaches 1.50m / min, the industrial computer gives a signal to control the one-way rotation stirring current as 100A, stirring frequency 14Hz, generating an alternating magnetic field to stir the molten steel in the secondary cooling section. At the same time, according to the quality of the slab, adjust the casting speed to 2.00-2.50m / min and the mold cooling water to 20-30m 3 / h; control the cooling water volume of the agitator body ≥ 10m 3 / h, take away the radiant heat of the red billet to the agitator body and...

Embodiment 2

[0032] Put 30 tons of smelted 35CrMo molten steel into the tundish after vacuum degassing treatment, add a certain amount of covering agent on the surface of the molten steel in the molten pool to keep the temperature of the molten steel at 1550°C to 1560°C.

[0033] After the molten steel is pulled out of the crystallizer with a dummy rod, the red billet passes through the electromagnetic stirrer body 2 in the secondary cooling section. When the billet drawing speed reaches 1.50m / min, the industrial computer gives a signal to control the one-way rotation stirring current as 150A, stirring frequency 18Hz, generating an alternating magnetic field to stir the molten steel in the secondary cooling section. At the same time, according to the quality of the slab, adjust the casting speed to 2.00-2.50m / min and the mold cooling water to 20-30m 3 / h; control the cooling water volume of the agitator body ≥ 10m 3 / h, take away the radiant heat of the red billet to the agitator body and...

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Abstract

The invention provides an ultrasound-electromagnetic composite energy field continuous casting method for alloy steel. According to the method, refined steel melt is continuously cast and formed under the joint action of ultrasounds and an electromagnetic field, the function of the electromagnetic energy field is achieved through electromagnetic stirrers, and the electromagnetic stirrers are arranged at a secondary cooling section and the solidification tail end; stirring is conducted through a rotation magnetic field, coils of stirrer bodies are used for hollow copper pipe inner cooling, the electromagnetic stirrer body at the secondary cooling section is arranged behind a crystallizer by 1m-3 m, and the electromagnetic stirrer body at the solidification tail end is arranged in front of a throwing machine by 3 m-6 m. An ultrasonic energy field is achieved in the manner that high-temperature resisting ceramic tool heads of two sets of ultrasonic devices are directly and symmetrically inserted in melt at the part away from the edge part of a melt pool by the 1 / 4 of the diameter, and the inserting depth ranges from 20 mm to 70 mm. An alloy steel cast ingot prepared through the method is uniform in structure, the isometric crystal proportion is high, few air hole and porosity defects exist, the production efficiency is high, and the method is suitable for batched production.

Description

technical field [0001] The invention relates to the fields of electromagnetic fields, ultrasonic waves and metal solidification, in particular to the application of an ultrasonic-electromagnetic composite energy field in the solidification and forming process of high-temperature melts. Background technique [0002] Electromagnetic stirring technology can improve the heat transfer efficiency in the crystallizer, make the temperature inside the molten steel uniform, interrupt the dendrites at the solidification front, refine the grains, reduce component segregation, and expand the equiaxed crystal area. This technology is widely used in the melting and casting process of alloy steel. Due to the skin-absorbing effect of electromagnetic induction, the strong action area of ​​electromagnetic stirring is in the surface area of ​​the ingot, and the effect becomes weaker as it goes deeper into the center. Therefore, there is a blind area of ​​electromagnetic stirring in the middle o...

Claims

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Application Information

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IPC IPC(8): B22D11/115
CPCB22D11/001B22D11/115
Inventor 石琛周亚军毛大恒毛向辉
Owner CENT SOUTH UNIV
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