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The Method of Using Electromagnetic Stirring to Improve the Internal Quality of Slab

A technology of electromagnetic stirring and internal quality, applied in the field of continuous casting, can solve problems such as difficulty in mastering the process, mismatch of continuous casting process parameters, optimization of process parameters, etc., and achieve the effect of improving internal quality

Active Publication Date: 2019-04-19
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the online application of electromagnetic stirring in my country has made great progress and development, but because electromagnetic stirring is a new technology, its process is not easy to master, and domestic application research is not sufficient, so the application effect is not satisfactory. There are the following points: the process test is insufficient, and the process parameters are not fully optimized; the steel type is not suitable, and the effect of electromagnetic stirring on special steel types such as silicon steel, high carbon steel, stainless steel, and thick plate is relatively obvious, while ordinary steel has limited effect ; Electromagnetic stirring parameters do not match continuous casting process parameters such as casting speed, so that it fails to exert its due effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The chemical composition of the steel is: [C]: 0.15%, [Si]: 0.20%, [Mn]: 1.00%, [P]: 0.02%, [S]: 0.004%, [Al]: 0.03%, [ Nb]: 0.02%, [Ti]: 0.02%, [N]: 0.0045%, and the balance is Fe. The production process includes molten iron pretreatment, converter smelting, refining outside the furnace, and continuous casting of slabs. A total of 8 furnaces of steel are produced in one tundish. The cross-sectional size of the slab is: 2065×220mm 2 , the casting speed is 1.10m / min, the specific water volume of the secondary cooling is 0.70L / Kg, and the parameters of the two pairs of electromagnetic stirring in the secondary cooling zone are 400A, 6Hz. The central segregation of the continuous casting slab produced by this tundish is within C1.0 grade, the equiaxed grain rate is 30%, and the qualified rate of flaw detection is 100%.

Embodiment 2

[0029] The chemical composition of the steel is: [C]: 0.35%, [Si]: 0.19%, [Mn]: 0.96%, [P]: 0.018%, [S]: 0.003%, [Al]: 0.027%, [ Nb]: 0.018%, [Ti]: 0.019%, [N]: 0.0042%, and the balance is Fe. The production process includes molten iron pretreatment, converter smelting, out-of-furnace refining, and continuous casting of slabs. A total of 12 furnaces of steel are produced in one tundish. The cross-sectional size of the slab is: 2065×220mm 2 , the casting speed is 1.10m / min, the specific water volume of the secondary cooling is 0.80L / Kg, and the parameters of the two pairs of electromagnetic stirring in the secondary cooling zone are 380A, 3Hz. The central segregation of the continuous casting slab produced by this tundish is within C1.0 grade, the equiaxed grain rate is 25%, and the qualified rate of flaw detection is 99.9%.

Embodiment 3

[0031] The chemical composition of the steel is: [C]: 0.40%, [Si]: 0.19%, [Mn]: 1.02%, [P]: 0.03%, [S]: 0.003%, [Al]: 0.028%, [ Nb]: 0.021%, [Ti]: 0.022%, [N]: 0.0044%, and the balance is Fe. The production process includes molten iron pretreatment, converter smelting, refining outside the furnace, and continuous casting of slabs. A total of 15 furnaces of steel are produced in one tundish. The cross-sectional size of the slab is: 2065×220mm 2 , the casting speed is 1.10m / min, the specific water volume of the secondary cooling is 0.85L / Kg, and the parameters of the two pairs of electromagnetic stirring in the secondary cooling zone are 400A, 6Hz. The central segregation of the continuous casting slab produced by this tundish is within C1.0 grade, the equiaxed grain rate is 35%, and the qualified rate of flaw detection is 99.95%.

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Abstract

The invention discloses a method for improving the internal quality of a plate blank through electromagnetic stirring. An electromagnetic stirring roller is mounted in the position, where the un-solidified rate of the casting blank is 25%-40%, of a secondary cooling area, aiming at the carbon content and the casting blank thicknesses of the different steel grades, the suitable secondary cooling specific water flow and electromagnetic stirring parameters are adopted to improve the application effect of the electromagnetic stirring technology, and reference is provided for reasonable selection of the plate blank secondary cooling area for the mounting position, the use condition and stirring parameter setting of an electromagnetic stirring device.

Description

technical field [0001] The application belongs to the technical field of continuous casting, and in particular relates to a method for improving the internal quality of a slab by using electromagnetic stirring. Background technique [0002] The competition in the iron and steel industry is becoming more and more fierce. In recent years, the proportion of variety steel products for wide and thick plates has gradually increased, and the downstream processes have put forward more and more stringent requirements for the quality of casting billets. Due to the influence of the compression ratio of the slab, the internal quality including segregation, porosity and shrinkage cavity is difficult to eliminate, which seriously affects the internal quality of the slab, and the pass rate of the plate flaw detection is difficult to guarantee. [0003] The electromagnetic stirring technology in the secondary cooling zone of continuous casting is to use the action of electromagnetic force t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/115B22D11/12
CPCB22D11/115B22D11/122
Inventor 苏笃星邹长东张志建周青峰胡军
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE