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System for forcibly cooling solidification tail end of large-section continuous casting round billet and control method thereof

A continuous casting round billet and solidification end technology, which is applied in the field of continuous casting of iron and steel, can solve the problems of large shell line shrinkage, long solidification distance, and large hydrostatic pressure of steel, so as to improve internal quality, increase product yield, and reduce difficulty Effect

Active Publication Date: 2020-12-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the characteristics of small specific surface area, large static pressure of molten steel, large linear shrinkage of billet shell, large heat capacity of billet shell, long solidification distance, small radiant heat intensity of casting billet in secondary cooling zone, long liquid phase cavity, etc. , and round billet continuous casting equipment is different from slab and square billet, generally there is no light reduction process, so there is segregation and looseness in the center of continuous casting round billet, and it is easy to produce center cracks, which affects the overall product quality pass rate and stability

Method used

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  • System for forcibly cooling solidification tail end of large-section continuous casting round billet and control method thereof
  • System for forcibly cooling solidification tail end of large-section continuous casting round billet and control method thereof
  • System for forcibly cooling solidification tail end of large-section continuous casting round billet and control method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0069] On the continuous casting production line of a domestic steel plant producing Φ600 large round billets, the method of forced cooling at the solidification end of large cross-section round billets is adopted, and the cooling method is cooling water. A forced cooling device is installed at a distance of 17m-21m from the meniscus of the crystallizer. The forced cooling device is fourteen cooling rings fixed on the continuous casting equipment. Every two cooling rings form a cooling ring group, and a cooling ring group The interval between the two cooling rings is 0.2m, and the interval between each cooling ring group is 0.35m. The cooling ring is a circle with a radius of 550mm and is made of stainless steel pipe with an inner diameter of 15mm. Each cooling ring is equipped with eight nozzles. The nozzles are connected to the cooling water in the cooling ring. The cooling ring is connected to the cooling water system, which can be controlled by The device system remotely o...

Embodiment 2

[0073]On the continuous casting production line of a domestic steel plant producing Φ600 large round billets, the method of forced cooling at the solidification end of large cross-section round billets is adopted, and the cooling method is air mist cooling. A forced cooling device is installed at a distance of 17m-21m from the meniscus of the crystallizer. The forced cooling device is fourteen pairs of cooling rings fixed on the continuous casting equipment. The cooling ring is a circle with a radius of 550mm. Made of stainless steel tubes, each pair of cooling rings is composed of two cooling rings connected side by side, one of which is connected to the cooling water system, and the other cooling ring is connected to the compressed gas system, and each pair of cooling rings is equipped with eight Nozzles, the nozzles are connected with cooling water and gas inside the cooling ring pair. Every two cooling ring pairs form a cooling ring group, the two cooling ring pairs in a c...

Embodiment 3

[0077] A steel factory adopts the method of forced cooling at the end of continuous casting and solidification of large cross-section round billets on the production line of Φ800 continuous casting large round billets. A movable forced cooling device with a length of 3m is installed on the continuous casting production line. The forced cooling device It consists of sixteen cooling rings, with an interval of 0.18m between each two cooling rings. The cooling ring is a regular dodecagon made of stainless steel pipe with an inner diameter of 18mm. Each cooling ring is equipped with twelve nozzles. The cooling ring is connected with the air circuit and the water circuit. Each cooling ring can be opened and closed by the control device system Control the ratio of cooling water and gas.

[0078] When the steel plant produces WB36V steel Φ800 continuous casting round billets for high-pressure furnaces, the casting speed is 0.11m / min, the casting temperature is 1530°C, the liquidus tem...

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Abstract

The invention belongs to the technical field of continuous casting in steel and iron production and relates to a system for forcibly cooling a solidification tail end of a large-section continuous casting round billet and a control method, the system comprises cooling devices, a cooling water supply device, a compressed air supply device and a control device. The cooling water supply device and the compressed air supply device are both connected with the cooling devices, and the control device is in control connection with the cooling device, the cooling water supply device and the compressedair supply device. The cooling devices are sequentially arranged after the continuous casting billet is straightened and before the continuous casting billet is cut in the pulling speed direction, thecontinuous casting round billet passes through the center of a cooling ring, the solidification tail end area of the round billet is cooled through water spraying cooling or aerial fog cooling, and the cooling area and the cooling strength are controlled through the control device. By means of the method, a system for effectively cooling the continuous casting solidification tail end of the large-section round billet can be established, the surface layer and the middle layer of the casting billet can generate large tensile stress, tensile stress generated by center solidification of the casting billet is restrained, center cracks of the casting billet are controlled and eliminated, and the casting billet product quality is improved.

Description

technical field [0001] The invention relates to the technical field of continuous casting of iron and steel, in particular to a system for forced cooling at the solidification end of a large-section continuous casting round billet and a control method thereof. Background technique [0002] The continuous casting round billet has developed rapidly in recent years, and the cross-sectional diameter is also expanding and developing. However, with the increasingly stringent requirements for the continuous casting diameter and internal and external quality of the round billet in various application fields, the production requirements of the billet are also getting higher and higher. come higher. Due to the characteristics of small specific surface area, large static pressure of molten steel, large linear shrinkage of billet shell, large heat capacity of billet shell, long solidification distance, small radiant heat intensity of casting billet in secondary cooling zone, long liquid...

Claims

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Application Information

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IPC IPC(8): B22D11/124B22D11/22
CPCB22D11/124B22D11/225
Inventor 刘建华谢仲豪何杨张杰武晓燕闫柏军
Owner UNIV OF SCI & TECH BEIJING