Method for establishing electromagnetic stirring parameters of secondary cooling area of plate blank

A technology of electromagnetic stirring and secondary cooling, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of large differences in conclusions and large differences in stirring effects, etc. The effect of improving the internal quality of the billet and increasing the stirring intensity

Active Publication Date: 2012-07-04
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the existing technologies are aimed at improving the electromagnetic stirring equipment, but regarding the determination of the electromagnetic stirring parameters in the secondary cooling zone of the slab, in the published articles, only the current intensity and frequency affect the stirring effect, and the conclusions of each report are different. larger
The electromagnetic stirrer is usually composed of two pairs of coils, and its arrangement is mainly divided into the same side a

Method used

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  • Method for establishing electromagnetic stirring parameters of secondary cooling area of plate blank
  • Method for establishing electromagnetic stirring parameters of secondary cooling area of plate blank
  • Method for establishing electromagnetic stirring parameters of secondary cooling area of plate blank

Examples

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Embodiment 1

[0048] The method of the invention is used to calculate the magnetic field distribution generated by different electromagnetic stirrer arrangements, and to determine a reasonable electromagnetic stirrer arrangement.

[0049] The steel grade is 45# high carbon steel, which is implemented on the electromagnetic stirrer in the secondary cooling zone of the slab casting machine with a size of 200×1450 mm. The current is 400A, the frequency is 5Hz, the drawing speed is 1.4m / min, and the superheat degree is 18℃.

[0050] Calculate the relative permeability of air, rolls, coils, shells, molten steel and water in =1, the resistivity is 1×10 20 Ω m, 7.0×10 -7 Ω m, 1.67×10 -8 Ω m, 7.5×10 -7 Ω m, 150×10 -8 Ω m, 670 Ω ·m. The convergence monitoring amount of the electromagnetic field is less than 10 -6 , the calculated residual is less than 10 -4 .

[0051] The assumptions are:

[0052] 1. The molten steel is an incompressible conductive fluid, and the density, viscos...

Embodiment 2

[0063] The method of the invention is used to calculate the magnetic field distribution generated by different stirring current directions, and to determine a reasonable stirring current direction.

[0064] The steel grade is 45# high carbon steel, which is implemented on the electromagnetic stirrer in the secondary cooling zone of the slab casting machine with a size of 200×1450 mm. The current is 400A, the frequency is 5Hz, the drawing speed is 1.4m / min, and the superheat degree is 18℃.

[0065] Calculate the relative permeability of air, rolls, coils, shells, molten steel and water in =1, the resistivity is 1×10 20 Ω m, 7.0×10 -7 Ω m, 1.67×10 -8 Ω m, 7.5×10 -7 Ω m, 150×10 -8 Ω m, 670 Ω ·m. The convergence monitoring amount of the electromagnetic field is less than 10 -6 , the calculated residual is less than 10 -4 .

[0066] The assumptions are:

[0067] 1. The molten steel is an incompressible conductive fluid, and the density, viscosity coefficient ...

Embodiment 3

[0077] The agitator adopts the opposite arrangement, and the stirring current selects the opposite current to verify the implementation effect.

[0078] The steel grade is 45# high carbon steel, which is implemented on the electromagnetic stirrer in the secondary cooling zone of the slab casting machine of 200×1450 mm. The stirrer is located 4m below the meniscus, and the section size of the slab is 200×1380 mm. The current intensity is 400A, the frequency is 5Hz, the drawing speed is 1.4m / min, and the superheat degree is 18℃.

[0079] The stirrer is arranged oppositely, and the direction of stirring current selects an opposite current, and 8 furnaces are continuously produced, and the production runs smoothly. The dendrite inspection results show that the center of the billet is loose, subcutaneous cracks, core cracks, shrinkage holes and subcutaneous bubbles are all zero. grade, the central segregation is C0.5 grade, the average equiaxed grain rate is over 50%, and the inter...

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Abstract

The invention provides a method for establishing electromagnetic stirring parameters of a secondary cooling area of a plate blank. The method comprises the following steps of: performing analog computation of a finite element value according to assumption of a site electromagnetic stirring condition, thereby obtaining the magnitude and the distribution state of the magnetic flux density; accordingly, judging the magnitudes of stirring effects caused by the distribution modes of different stirrers and a stirring current direction; and confirming the reasonable electromagnetic stirring distribution mode and the stirring current direction. According to the method provided by the invention, various physical quantities of an electromagnetic field, such as magnetic flux density, electromagneticforce, and the like, can be quickly calculated, the reasonableness of the present electromagnetic stirring parameters and the magnitude of the electromagnetic stirring strength can be accurately verified, and the optimal electromagnetic stirring parameters required by the electromagnetic stirring under different continuous casting conditions can be effectively judged, thereby reasonably selectingand confirming the electromagnetic stirrer distribution mode and the stirring current direction. The parameters and the mode optimized according to the method can be used for obviously increasing thestirring strength, the isometric crystal rate and the tissue compactness and evenness.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting and continuous casting technology, and in particular relates to an arrangement mode of an electromagnetic stirrer in a slab secondary cooling zone and a method for judging and determining the direction of a stirring current. Background technique [0002] The rational use of electromagnetic stirring technology in the secondary cooling zone of the slab continuous casting machine can significantly reduce the center segregation and center porosity, greatly increase the equiaxed grain rate, basically eliminate internal cracks and center shrinkage cavities, and improve the pass rate of the slab, especially for The effect of electromagnetic stirring is particularly obvious for wide and thick plates, and has become an important technical means, which has been proved by the practice of many steel mills at home and abroad. [0003] However, at present, the electromagnetic stirring parameters...

Claims

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Application Information

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IPC IPC(8): B22D11/22G06F17/50
Inventor 金百刚王军陈明李立勋赵雷翟宝鹏
Owner ANGANG STEEL CO LTD
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