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Method for controlling online calibration of pulling-straightening roller gap under light pressure of bloom caster

A control method and soft reduction technology, which is applied in the field of bloom continuous casting soft reduction technology, can solve problems such as low efficiency and unstable quality of blooms, and achieve the goal of reducing center segregation, eliminating center shrinkage cavity and center porosity Effect

Inactive Publication Date: 2009-10-14
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the disadvantages of low efficiency of the existing roll gap calibration technology and the unstable quality of the bloom after light reduction, the present invention provides a control method capable of online calibration of the roll gap of the drawing and straightening rolls of the bloom continuous casting machine

Method used

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  • Method for controlling online calibration of pulling-straightening roller gap under light pressure of bloom caster
  • Method for controlling online calibration of pulling-straightening roller gap under light pressure of bloom caster
  • Method for controlling online calibration of pulling-straightening roller gap under light pressure of bloom caster

Examples

Experimental program
Comparison scheme
Effect test

Embodiment ( 1

[0039] (1) Casting machine equipment parameters: full arc bloom continuous casting machine, radius 12m, straightening section and horizontal section casting roller diameter of 450mm, casting machine metallurgical length 33.149m (liquid level to flame cutting machine origin) . The distribution of tension leveling rolls is shown in Table 1.

[0040]Table 1 The position of each roller of the tension leveling machine

[0041]

[0042] (2) The billet size is 280mm×325mm, the steel type is GCr15, and the total reduction is 10mm. The steel composition, casting temperature and casting speed are shown in Table 2.

[0043] Table 2 Steel composition, casting temperature and casting speed

[0044]

[0045] (3) When casting bearing steel, when the casting speed is 0.78m / min, the end point of solidification is 23.4m, so the set casting speed under light reduction is 0.78m / min, and the target casting speed for determining the roll gap calibration is also 0.78m / min.

[0046] (4) The...

Embodiment ( 2

[0052] (1) The parameters of the casting machine equipment are as in Example (1)

[0053] (2) The billet size is 280mm×325mm, the steel type is SWRH82B, and the total reduction is 9mm. The steel composition, casting temperature and casting speed are shown in Table 4.

[0054] Table 4 steel composition, casting temperature and casting speed

[0055]

[0056] (3) When casting SWRH82B, when the casting speed is 0.80m / min, the end point of solidification is 23.3m, so the set casting speed under light reduction is 0.80m / min, and the target casting speed for roll gap calibration is also 0.80 m / min.

[0057] (4) The size and set reduction of the cold slab are shown in Table 5.

[0058] Table 5 Comparison table of furnace number, cold billet size and set reduction

[0059]

[0060] Table 5 is the experimental data during the hot test of SWRS82B, and the detection method is the same as that of bearing steel GCr15. It can be seen that after online calibration of SWRH82B, the s...

Embodiment ( 3

[0062] (1) The parameters of the casting machine equipment are as in Example (1)

[0063] (2) The billet size is 280mm×325mm, the steel type is SWRH72A, and the total reduction is 9mm. The steel composition, casting temperature and casting speed are shown in Table 6.

[0064] Table 6 Steel composition, casting temperature and casting speed

[0065]

[0066] (3) When casting SWRH72A, when the casting speed is 0.75m / min, the end point of solidification is 22.0m, so the set casting speed under light reduction is 0.75m / min, and the target casting speed for roll gap calibration is also 0.75 m / min.

[0067] (4) The size of the cold slab and the set reduction are shown in Table 7.

[0068] Table 7 Comparison table of heat number, cold billet size and set reduction

[0069]

[0070] Table 7 is the experimental data during the hot test of SWRS72A, and the detection method is the same as that of bearing steel GCr15. It can be seen that after online calibration is adopted, the ...

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Abstract

A method for controlling the online calibration of a pulling-straightening roller gap under the light pressure of a bloom caster belongs to the process field of the bloom caster under the light pressure in steel production. The method comprises the following steps of: (1) determining the object pulling rate v0 of the online calibration roll gap; (2) recording the roll gap value and the number of instantaneous roll gaps; (3) calculating the average value Si of each roll gap and the difference Di between the average value Si and the average S1 of a No. 1 roll gap; (4) calibrating the roll gap and implementation calibration on each pulling-straightening roller according to the roll gap Di from step (3), with the roll gap value of a pulling-straightening roller equal to the roll gap value of No. 1 roller plus Di. The online roll gap calibration method can calibrate the roll gap when in pouring for each time, can ensure the accurate implementation of the proposal under presupposition pressure, thereby obviously reducing the center segregation of a casting slab, reducing or even eliminating the occurrence of center shrinkage and center porosity.

Description

technical field [0001] The invention belongs to the field of bloom continuous casting soft reduction technology in steel production, and in particular relates to a control method for online calibration of roll gaps of straightening rollers in light reduction drawdown of a bloom continuous caster. Background technique [0002] The bloom continuous casting machine with a billet cross-sectional size greater than 220mm×220mm mainly casts high-quality steel and alloy steel for rolling high-strength section steel, wire rod, channel steel, angle steel, round steel and seamless steel pipe, etc. Steel grades that are more stringent than required. Due to the large cross-sectional size of the billet of the bloom continuous casting machine, the solidification time of the billet is longer, and the tendency of the billet to produce center segregation, center looseness, and isocenter defects is greater. Center segregation and porosity are first formed in the continuous casting process, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16
Inventor 祭程朱苗勇曹学欠
Owner NORTHEASTERN UNIV
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