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Control method of forced cooling system at solidification end of large section continuous casting round billet

A technology for continuous casting of round billets and solidification ends, applied in the field of steel continuous casting, can solve the problems of large shell line shrinkage, long solidification distance, large hydrostatic pressure of molten steel, etc., to improve product yield, improve internal quality, and reduce difficulty. Effect

Active Publication Date: 2021-11-12
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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  • Control method of forced cooling system at solidification end of large section continuous casting round billet
  • Control method of forced cooling system at solidification end of large section continuous casting round billet
  • Control method of forced cooling system at solidification end of large section continuous casting round billet

Examples

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Effect test

Embodiment 1

[0069] On the continuous casting production line of a domestic steel plant with a diameter of 600 large round billets, the method of forced cooling at the solidification end of the continuous casting of large cross-section round billets is adopted, and the cooling method is cooling water 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 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 c...

Embodiment 2

[0073]On the continuous casting production line of a domestic steel plant with a diameter of 600 large round billets, the method of forced cooling at the solidification end of the continuous casting 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,...

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 continuous casting large round billets with a diameter of 800. A movable forced cooling device with a length of 3m is installed on the continuous casting production line. The cooling device consists of sixteen cooling rings, with an interval of 0.18m between every 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 for high-pressure furnaces with a diameter of 800 continuous casting round billets, the casting speed is 0.11m / min, the casting temperature ...

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Abstract

The invention belongs to the technical field of continuous casting in iron and steel production, and relates to a system and a control method for forced cooling of the solidification end of a large-section continuous casting round billet. The system includes a cooling device, a cooling water supply device, a compressed air supply device and a control method. device; the cooling water supply device and the compressed air supply device are connected to the cooling device, and the control device is respectively connected to the cooling device, the cooling water supply device and the compressed air supply device. The cooling device is installed sequentially along the casting speed direction after the continuous casting slab is straightened and before cutting. The continuous casting round slab passes through the center of the cooling ring, and the solidification end area of ​​the round slab is cooled by water spray cooling or air mist cooling, controlled by the control device Cooling area and cooling intensity. This method can establish an effective cooling system for the solidification end of continuous casting of large-section round slabs, which can generate greater tensile stress on the surface and middle layers of the slab, suppress the tensile stress generated by the solidification of the center of the slab, and control and eliminate cracks in the center of the slab. Improve the quality of billet products.

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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Patent Type & Authority Patents(China)
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