Method for direct intervening of internal quality of casting blank

An internal quality and direct technology, applied in the field of direct intervention in the internal quality of the slab, can solve problems such as the center shrinkage cavity and center porosity of the slab, the troublesome continuous casting operation and maintenance, and the high cost of the electromagnetic stirring device, so as to improve the flaw detection Pass rate, low operating cost, and the effect of improving various performances

Inactive Publication Date: 2006-12-13
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 billet, component segregation, and sometimes ring segregation, which is difficult to solve the center of the bille

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0008] equipment

[0009] Use two (or one) belt feeding machines, each machine has one (or two) thin strips, and the thin strips are vertically inserted into the mold molten steel at the same time.

[0010] The belt feeding device is equipped with two sets of control modes, manual and automatic. When it is manual, the feeding amount can be set by panel operation; when it is automatic, it is connected to the drawing control signal (4-20mA or 0-5V) and the feeding speed is automatically tracked and adjusted with the drawing speed. Feeding speed is continuously adjustable.

[0011] raw material

[0012] The selection of thin strip should comprehensively consider the price of thin strip (yuan / ton), design feeding amount (kg / ton), billet unit weight (ton / m), continuous casting casting speed (m / min), process adaptability, The melting condition and insertion depth of the thin strip in the height direction of the crystallizer, etc. Generally, hot-rolled thin strip, acid thin strip...

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PUM

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Abstract

The invention relates to a method for direct interfering casting blank quality, belonging to field of continuous cast steel production technology. The method employs feeding apparatus to insert metallic band into mould liquid steel, and said band can vibrate according to applicable frequency and amplitude. The method interferes internal coagulation and crystallization directly by controlling band inserting mode and speed, the degree of superheat of crystallizer liquid steel is reduced, depth of liquid core is shortened, columnar crystal is decreased, equiax crystal proportion is increased, coagulation tissue of cast blank is improved, central aliquation is released, zigzag plasticity, dynamic ductility of steel products are improved, and fault localization percent of pass is increased. Furthermore, the pulling rate and production rate can be increased on condition of guaranteeing cast blank quality. The invention is characterized by low investment, reduced energy consumption, low operation cost, convenient device maintenance, and eligibility for various cast blank production.

Description

technical field [0001] The invention belongs to the technical field of continuous cast steel production in the metallurgical industry, and in particular relates to a method for directly intervening in the internal quality of a slab. Background technique [0002] The solidification process of molten steel plays an important role in the quality of steel. In the production process of continuous steel casting, the molten steel is rapidly cooled in the crystallizer to form a slab shell first, and the cooling process is from the edge to the inside, and the temperature in the center is high, resulting in a high temperature difference along the section of the slab, and the crystallization process In the middle, internal defects such as element analysis and central porosity are formed in the central area of ​​the slab. Practice has proved that this problem is a typical difficult problem in the continuous casting production process in the world. [0003] The use of high-quality cast...

Claims

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Application Information

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IPC IPC(8): B22D11/10
Inventor 祝桂合周兰聚孟春光杨宪礼
Owner SHANDONG IRON & STEEL CO LTD
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