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Dynamic control method for slab continuous casting electromagnetic stirrer

An electromagnetic stirrer and dynamic control technology, which is applied in the field of iron and steel smelting and continuous casting, can solve the problems of inconsistency in billet quality and unstable stirring effect, and achieve a stable effect

Inactive Publication Date: 2012-07-11
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the process conditions in the actual production process are constantly changing, the thickness of the solidified shell at the position of the electromagnetic stirrer and the volume of the unsolidified liquid phase are also constantly changing. If the stirring parameters cannot be changed accordingly, the stirring effect will inevitably be reduced. Unstable, which in turn causes the defect that the quality of the slab is good and bad

Method used

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  • Dynamic control method for slab continuous casting electromagnetic stirrer
  • Dynamic control method for slab continuous casting electromagnetic stirrer
  • Dynamic control method for slab continuous casting electromagnetic stirrer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Using magnetic induction B Calculation formula for current and frequency determination.

[0023] The specific conditions are: control the electromagnetic stirrer in the secondary cooling zone of the 200×1450 mm slab continuous caster, and the electromagnetic stirrer is located 3.9m below the meniscus.

[0024] First of all, the continuous casting primary computer control system collects the actual process parameters of on-site continuous casting production according to the set program. The collected process parameters are: steel type 45# steel; slab thickness 200 mm, width 1450 mm; molten steel temperature 1507 °C; superheat degree 16 °C; casting speed 1.3 m / min. At the same time, the continuous casting primary computer transmits various real-time data collected to the continuous casting secondary computer;

[0025] The continuous casting secondary computer continuously processes the various measured data received from the primary computer according to the set program...

Embodiment 2

[0031] The current intensity and frequency are selected and controlled by using the recommended 200×1450 mm slab continuous caster slab unsolidified rate and the corresponding table of current intensity and frequency determined by the width of the mushy zone.

[0032] The electromagnetic stirrer is located 5.6m below the meniscus.

[0033] The continuous casting first-level computer control system collects the actual process parameters of on-site continuous casting production according to the set program. The collected process parameters are: steel grade 65Mn steel; slab section size 200×1280mm; molten steel temperature 1492°C; superheat 20°C; casting speed 1.1m / min. At the same time, the continuous casting primary computer transmits various real-time data collected to the continuous casting secondary computer.

[0034] The continuous casting secondary computer continuously processes the various measured data received from the primary computer according to the set program, an...

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Abstract

The invention provides a dynamic control method for a slab continuous casting electromagnetic stirrer, which includes: acquiring and processing field production process data by the aid of a primary continuous casting computer and a secondary continuous casting computer to obtain related numerical values of non-solidification rate of molten steel in a casting blank, mushy zone width and the like; substituting selected, set and measured data into a magnetic induction density B calculation formula to obtain corresponding frequency values or current density values; and adjusting and controlling the electromagnetic stirrer in real time according to the values. The dynamic control method can be used for continuously calculating the related data of the non-solidification rate of the casting blank, the mushy zone width and the like according to change of field process conditions, automatically adjusting electromagnetic stirring current and frequency, enabling electromagnetic stirring effects to be more stable, and meeting the requirements of various steel types on segregation, so that the casting blank has no defects of cracks, needle holes, bubbles, scab, inclusion and the like, the isometric crystal rate of the casting blank reaches 55%, and central segregation degree is blow C1.0.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting and continuous casting, and in particular relates to a real-time dynamic control method of a slab continuous casting electromagnetic stirrer. Background technique [0002] Reasonable use of electromagnetic stirring technology in the secondary cooling zone on the slab continuous casting machine can significantly reduce the center segregation and center porosity of the slab, greatly increase the equiaxed grain rate, basically eliminate internal cracks and central shrinkage cavities, and improve the pass rate of the slab. Especially for wide and thick plates, the metallurgical effect of electromagnetic stirring is particularly obvious, and it has become an important technical means, which has been confirmed by the continuous casting production practice of steel factories all over the world. [0003] At present, the electromagnetic stirring parameters designed by domestic and foreign s...

Claims

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Application Information

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IPC IPC(8): B22D11/22B22D11/115
Inventor 金百刚王军李立勋
Owner ANGANG STEEL CO LTD
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