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Homogenized slab continuous casting production method under external field cooperative control effect

A control-action, slab continuous casting technology, applied in the field of steelmaking and continuous casting, which can solve the problems of white bright strips, distance between installation positions, reduction of center segregation and porosity, etc.

Active Publication Date: 2021-07-16
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electromagnetic stirring of the secondary cooling is prone to the problem of white and bright bands, and the improvement of segregation is limited; the mechanical pressing of the solidification end changes the solidification process of the slab by applying mechanical force, compensates for solidification shrinkage, inhibits the growth of shrinkage cavities, and discharges through extrusion Concentrated molten steel reduces center segregation and porosity
[0004] These two technologies improve center segregation and center porosity from different aspects, but both technologies have certain problems, and the degree of improvement of the internal quality of the slab is far from enough
Although these two technologies have been installed on the continuous casting machines of many production enterprises at the same time, the installation positions of the two technologies are far away from each other, and the coordinated control cannot be achieved. The concentrated molten steel discharged by mechanical pressing cannot be further mixed. Poor improvement is limited

Method used

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  • Homogenized slab continuous casting production method under external field cooperative control effect
  • Homogenized slab continuous casting production method under external field cooperative control effect
  • Homogenized slab continuous casting production method under external field cooperative control effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1, instead of using the secondary cooling electromagnetic stirring technology, using mechanical reduction technology, the reduction amount of mechanical reduction is 10mm, and the reduction position is the seventh and eighth sector of the secondary cooling zone. Other parameters are shown in Table 1 and Table 2 and shown in Table 3. The porosity of the cast slab obtained in this embodiment is shown in Table 5, and the center C segregation rate is as follows image 3 and as shown in Table 5, the low-magnification histogram as Figure 4 As shown in (a), the equiaxed crystal ratio is 12.7%.

Embodiment 2

[0034] Embodiment 2, using the secondary cooling electromagnetic stirring technology, without using the mechanical pressing technology, the installation position of the secondary cooling electromagnetic stirring is the second section of the secondary cooling zone, the solid phase ratio of the billet center at the installation place is 0, and the coil turns of the electromagnetic stirring roll The number is 50 turns, and the schematic diagram of the current direction applied to the electromagnetic stirring roller coil is as follows figure 2 As shown, the current intensity is 300A, the current frequency is 7Hz, and other parameters are shown in Table 1 to Table 3. The porosity of the cast slab obtained in this embodiment is shown in Table 5, and the center C segregation rate is as follows image 3 and shown in Table 5.

Embodiment 3

[0035] Embodiment 3, using the secondary cooling electromagnetic stirring technology, using the mechanical pressing technology, the installation position of the secondary cooling electromagnetic stirring is the second section of the secondary cooling zone, the solid phase ratio of the billet center at the installation place is 0, and the number of turns of the electromagnetic stirring roller coil is 50 turns, and the schematic diagram of the current direction applied to the electromagnetic stirring roller coil is as follows figure 2 As shown, the current intensity is 300A, the current frequency is 7Hz, the reduction amount of mechanical reduction is 10mm, and the reduction position is the seventh and eighth sectors of the second cold zone. Other parameters are shown in Table 1~Table 3 . The porosity of the cast slab obtained in this embodiment is shown in Table 5, and the center C segregation rate is as follows image 3 and shown in Table 5.

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Abstract

The invention discloses a homogenized slab continuous casting production method under the external field cooperative control effect, and belongs to the field of steelmaking-continuous casting. According to the method, electromagnetic stirring rollers are installed on fan-shaped sections of a secondary cooling area of a slab continuous casting machine, and meanwhile, the two fan-shaped sections after being subjected to electromagnetic stirring in the secondary cooling area at the slab continuous casting solidification tail end are mechanically pressed down, so that the homogenized slab is obtained. Molten steel can be stirred and mixed uniformly through secondary cooling electromagnetic stirring, so that the temperature of the molten steel and a solidified blank shell are made uniform, the equiaxed crystal ratio is increased, and the surface quality is improved. And the molten steel rich in solute elements can be promoted to be discharged to the upstream through mechanical downward pressing at the solidification tail end, center segregation is improved, solidification shrinkage of a casting blank is compensated for, and shrinkage hole growth is restrained. And meanwhile, secondary cooling electromagnetic stirring can further uniformly mix the concentrated molten steel discharged by means of mechanical downward pressing, and secondary cooling electromagnetic stirring and solidification tail end mechanical downward pressing are mutually combined, so that the purpose of improving the internal quality of the casting blank is achieved.

Description

Technical field: [0001] The invention belongs to the technical field of steelmaking-continuous casting, and in particular relates to a homogenized slab continuous casting production method under the coordinated control of an external field. Background technique: [0002] In recent years, with the continuous improvement of quality requirements for continuous casting slabs, people have paid more and more attention to the formation and harm of central segregation and central porosity in continuous casting slabs. Central segregation and central porosity seriously affect the internal quality of slabs, restricting the Production of high-quality, high value-added steel. [0003] In slab continuous casting, in order to reduce and eliminate slab center segregation and center porosity, the electromagnetic stirring technology in the secondary cooling zone and the mechanical pressing technology at the end of solidification are most used. Secondary cooling electromagnetic stirring can p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/12B22D11/124B22D11/16
CPCB22D11/122B22D11/124B22D11/1206B22D11/16
Inventor 朱苗勇尹胜奎罗森王卫领
Owner NORTHEASTERN UNIV
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