Method in use for conticaster for controlling solidification structure of casting block

A continuous casting machine and casting billet technology, applied in the field of continuous casting steel production in the metallurgical industry, can solve the problems of difficult to solve problems such as central shrinkage and central porosity of the casting billet, large equipment investment, composition segregation, etc., to achieve grain refinement, Low operating cost and the effect of eliminating subcutaneous air bubbles

Inactive Publication Date: 2005-11-16
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

At present, electromagnetic stirring is widely used in industry, but electromagnetic stirring not only consumes a lot of energy, but also produces bright white bands in the solidification structure of the cast slab, component segregation, and sometimes ring segregation. Electromagnetic stirring also has a limitation. , the molten steel can only be stirred in a small local area, but not the entire liquid phase cavity of the continuous casting slab. It is difficult to solve the central shrinkage cavity and central porosity of the slab. In addition, the investment in electromagnetic stirring equipment is also low. very big

Method used

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  • Method in use for conticaster for controlling solidification structure of casting block

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Embodiment 1

[0016] When the 5-strand billet continuous casting machine in a steel plant was casting normally, before the test, a 500mm continuous casting billet was taken from the flame cutting place of the first-class billet for low-magnification comparative analysis. Then insert a cermet electrode with a diameter of 10mm into the first-class 150×150mm crystallizer of the casting machine, and the depth of the electrode inserted into the molten steel is 100mm; the positive pole of the high-frequency pulse power supply is connected to the raceway bearing sleeve of the tension leveler with a cable (grounded). An 8V high-frequency pulse electric field is passed through the two electrodes, and the high-frequency pulse current value is 180A. The casting speed of the continuous casting machine is 2.1m / min, the casting steel is low-alloy steel, and the pouring temperature of the tundish is 1520°C. After 30 minutes, at the first-class flame cutting place, a 500mm continuous casting slab was taken...

Embodiment 2

[0018] When the six-strand billet continuous casting machine in a steel plant is in normal production, before the high-frequency pulse electric field treatment, a 500mm continuous casting billet is taken from the flame cutting place of the first-class billet for low-magnification comparative analysis. Then insert an aluminum carbon electrode with a diameter of 100mm and a length of 1500mm into the tundish of the casting machine. The depth of the electrode inserted into the molten steel is 700mm; the positive pole of the high-frequency pulse power supply is connected to the foundation of the continuous casting machine with a cable (grounded). A 12V high-frequency pulse electric field is passed through the two electrodes, and the high-frequency pulse current value is 480A. The casting speed of the continuous casting machine is 2.2m / min, the casting steel type is 20MnSi, and the tundish pouring temperature is 1530°C. After 30 minutes, at the first-class flame cutting place, a 500...

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Abstract

A method for the conticaster to control the solidified structure of cast blank includes providing a HF pulse power supply with positive and negative electrodes, inserting its negative electrode into the molten steel in the crystallizer or tundish of conticaster, electrically connecting its positive eletrode with the steel base of conticaster, and conticasting while regulating the voltages, current and frequency to improve the performance of cast blank.

Description

Technical field: [0001] The invention belongs to the technical field of continuous steel casting production in the metallurgical industry, and in particular relates to a method for controlling the solidification structure of a billet for a continuous casting machine to refine the crystal grains, increase the equiaxed crystal ratio and reduce cracks. Background technique: [0002] The quality of steel has a certain relationship with the smelting process of steel. The solidification process of molten steel has an important impact on the quality of steel. Defects such as inclusions, cracks, segregation, and porosity in steel are formed during the solidification process. High-quality slabs must effectively control the solidification process to inhibit the growth of columnar grains, promote the growth of equiaxed grains, refine grains, reduce composition segregation, and avoid central shrinkage and porosity. [0003] From the perspective of the existing technology, there are two ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/11
Inventor 王建军周俐李卫国
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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