A two-stage continuous dynamic repressing method for continuous casting slabs

A technology of continuous casting slab under heavy pressure, which is applied in the field of continuous casting production to achieve the effect of improving the density of slab, improving the segregation defect of slab, and improving the looseness of the center

Active Publication Date: 2017-10-31
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, because the solidification end varies greatly with the difference in pulling speed, steel type, superheat, and cross-sectional size, it is obviously not possible to maximize the rationality of the process by pressing at a fixed position

Method used

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  • A two-stage continuous dynamic repressing method for continuous casting slabs
  • A two-stage continuous dynamic repressing method for continuous casting slabs
  • A two-stage continuous dynamic repressing method for continuous casting slabs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this example, the section size of a bloom continuous casting machine is 380mm×490mm, and there are 12 tension-leveler frames in the air-cooling zone. When the casting speed of 0.45m / min is used to cast bearing steel GCr15, the starting point of pressing is located at 3# tension-leveler At the position, the change diagram of the center temperature inside the bloom and the center temperature on the surface is as follows figure 1 shown, from figure 1 It can be seen that the end point of the reduction is at the position where the temperature difference between the inner center temperature and the surface temperature of the slab is ≤200°C, that is, at the 9# tension leveler, and the solidification end point is located between the 7# and 8# tension leveler frames;

[0031] The first stage of reduction is 3#-6# tension leveler, and the second stage of reduction is 7#-9# tension leveler. The distribution of the reduction of each tension leveler is shown in the table below. ...

Embodiment 2

[0036] The section size of a wide and thick plate continuous casting machine is 280mm×1800mm, and the horizontal section is composed of 5 fan-shaped sections, namely the 9#-13# section. The segment length is 2.1m, and when Q345 is produced at a casting speed of 0.85m / min, the solidification end point is within the 10# segment;

[0037] The first stage of reduction is 9# segment, the second stage of reduction is 10#, 11# segment, and the reduction amount of each segment is set as shown in Table 2.

[0038] Table 2 The reduction process of each segment (mm)

[0039]

[0040] In this example, the wide-thick slab under two-stage heavy pressing and the wide-thick slab without two-stage heavy pressing are compared in the low-magnification cross-section at the 1 / 4 position in the width direction. image 3 shown, from image 3 It can be seen that the internal quality of the slab is significantly improved after the implementation of the two-stage continuous dynamic heavy reduction...

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Abstract

The invention belongs to the field of continuous casting production, and in particular relates to a two-stage continuous dynamic heavy-pressing method for continuous casting slabs. According to the respective characteristics of the bloom continuous casting machine and the wide and thick slab continuous casting machine, the present invention provides a two-stage continuous dynamic heavy reduction method, and provides a specific process parameter design method for the heavy reduction process, including the reduction interval The selection, division and design of the reduction amount. The invention improves the slab segregation defect in the first stage of pressing, and improves the loose defect of the casting slab in the second stage of continuous pressing, thereby realizing the synchronous improvement of slab segregation and porosity.

Description

technical field [0001] The invention belongs to the field of continuous casting production, and in particular relates to a two-stage continuous dynamic heavy-pressing method for continuous casting slabs. Background technique [0002] Large-section billet continuous casting machines and wide-thick slab continuous casting machines can replace traditional die casting, and produce continuous casting slabs that require strict rolling compression ratios. The metal yield can be increased by more than 10%, and the energy consumption per ton of steel can be reduced by 25% % or more, and has the advantages of uniform and stable composition, good surface quality, etc., and can significantly improve the performance of large-scale billet products. However, as the cross-sectional size of the slab increases, its internal cooling conditions deteriorate significantly, columnar crystals develop in the solidification structure, and the flow of residual molten steel rich in solute segregation e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/12
CPCB22D11/12
Inventor 祭程朱苗勇
Owner NORTHEASTERN UNIV LIAONING
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