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Space-time function-controlled multi-section linkage type continuous casting magnetic stirring system and method thereof

A magnetic stirring and linkage technology, applied in the field of iron and steel metallurgy, can solve the problems of limited homogeneity and density, inconsistent thickness and thermal state of the billet shell, and narrow process control window, so as to improve the metallurgical function and effect, overcome the effect The effect of short time and flexible working mode

Active Publication Date: 2019-12-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Changes in casting speed lead to different time spent by the billet in the traditional agitator, inconsistent thickness and thermal state of the billet shell, often the stirring effect is too strong or too weak, and the metallurgical effect is extremely unstable. Casting under different steel types and cross-sections Billet quality is difficult to reconcile
Even if some stirrers are movable, their range is mostly less than 2m, and their adaptability is very limited
[0005] At the same time, the working mode of the traditional magnetic stirrer is only a function of time, because it is easy to form a bright white band (negative segregation), which limits its improvement effect on homogeneity and density defects, the process control window is extremely narrow, and the utility is extremely limited

Method used

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  • Space-time function-controlled multi-section linkage type continuous casting magnetic stirring system and method thereof
  • Space-time function-controlled multi-section linkage type continuous casting magnetic stirring system and method thereof
  • Space-time function-controlled multi-section linkage type continuous casting magnetic stirring system and method thereof

Examples

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Effect test

Embodiment 1

[0039] A large round billet casting machine with a diameter of 350-650mm produces 50 steel, and its multi-section linkage continuous casting magnetic stirring system controlled by time-space function is composed of a stirrer unit group, that is, there are 3 stirrer units in the secondary cooling zone ( The first stirrer unit, the second stirrer unit and the third stirrer unit) constitute the secondary cold stirring (S-EMS) unit group, about 0.8m away from the lower opening of the crystallizer, and a total length of 2.4m along the drawing direction. There is a slab cooling device. The casting speed of 350mm billet is 0.6m / min. The three stirrer units in the stirrer unit group work at the same time. The first stirrer unit is clockwise, the second stirrer unit is counterclockwise, and the third stirrer unit is clockwise. The magnetic induction at the center of the stirrer unit is about The casting speed is 300Gs; the casting speed of 650mm slab is 0.24m / min, the first two units ...

Embodiment 2

[0041] A 410mm×530mm bloom produces GCr15 and Q345 steel, and the multi-section linkage continuous casting magnetic stirring system controlled by the space-time function is composed of two stirrer unit groups. One of the agitator unit groups includes two agitator units, that is, a secondary cooling stirring (S-EMS) unit consisting of 2 agitator units (the first agitator unit and the second agitator unit) is provided in the secondary cooling zone group, about 0.9m away from the lower mouth of the crystallizer, and a total length of 1.8m along the drawing direction; another stirrer unit group includes 3 stirrer units, that is, there are 3 stirrer units (the third stirrer unit, the second stirrer unit) The solidification end-stirring (F-EMS) unit group consisting of four agitator units and the fifth agitator unit) is about 16.5m away from the lower mouth of the crystallizer, and the total length along the casting direction is 2.6m. Both unit groups are equipped with casting slabs ...

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Abstract

The invention provides a space-time function-controlled multi-section linkage type continuous casting magnetic stirring system and a method thereof, and relates to the technical field of steel metallurgy. According to parameters such as continuous casting steel grade and cross-section size, dynamic stirring control with long interval, multi-mode and high-precision is carried out, so that the metallurgical function and effect of continuous casting magnetic stirring can be improved, and the regulation and control window of continuous casting process parameters is expanded; according to the system, a plurality of stirrer unit sets are arranged at different positions of a continuous casting machine, wherein each set of stirrer unit sets comprises a plurality of independently-controlled stirrerunits; the stirring modes of different stirrer units in the same stirrer unit set are the same or different, and the stirring mode is a function of time and space; linkage control is carried out between the stirring unit sets; and the stirring mode comprises rotary stirring, linear stirring, continuous stirring, alternating stirring and any combination of clockwise and counterclockwise stirring under a space-time function. The space-time function-controlled multi-section linkage type continuous casting magnetic stirring system is suitable for the continuous casting process of steel metallurgy.

Description

【Technical field】 [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a multi-section linkage continuous casting magnetic stirring system controlled by a space-time function and a method thereof. 【Background technique】 [0002] Continuous casting is a key process in steel production. Quality defects such as central segregation, porosity, and shrinkage cavities often appear in continuous casting slabs, which seriously affect product performance. At present, magnetic stirring technology has become an important means of controlling the solidification quality of slabs, and it is used in the continuous casting of square billets (rectangular billets), slabs, round billets and special-shaped billets. Magnetic stirring can strengthen the forced flow of molten steel inside the slab, which can not only reduce the capture of air bubbles and inclusions at the solidification front, but also homogenize the temperature and composition, and in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/115B22D11/16
CPCB22D11/115B22D11/16
Inventor 兰鹏王小松张家泉
Owner UNIV OF SCI & TECH BEIJING
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