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Method for promoting fine crystal solidification of continuously casting molten steel

A molten steel and fine-grain technology, which is applied in the field of promoting fine-grain solidification of molten steel for continuous casting, can solve problems such as poor fluidity of molten steel, impossibility of casting, and low temperature, and achieve the goals of improving the structure, increasing the number of grains, and reducing the size of grains Effect

Active Publication Date: 2010-02-24
WUHAN IRON & STEEL ENG TECH GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in several current methods, electromagnetic stirring and adding nucleating agent are more effective, but they also have their own shortcomings. For example, electromagnetic stirring device increases equipment investment, increases equipment maintenance, and adding nucleating agent There is also uneven addition, which is likely to cause deviations in the chemical composition of the steel
However, it is more difficult to control the degree of subcooling of molten steel. If the degree of supercooling is too small, it is easy to cause poor fluidity of molten steel, and the temperature is too low to prevent casting, resulting in production accidents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] Embodiments 1 to 8 of the method of the present invention are methods of adding micropowder to molten steel in the molten steel continuous casting process; the average particle diameter of the micropowder is less than 20 μm, and the amount of the micropowder added is 0.05% to 5% of the amount of molten steel to be cast; the above The micropowder is the micropowder of the same steel type material as the molten steel. See Table 1 for details.

[0021] Table 1:

[0022] Example

Type of steel

Adding method of fine powder of the same steel material as molten steel

Addition amount of fine powder%

1

Q235

Directly fed into the refined ladle furnace outside the furnace through the alloy chute

5

2

Q235

Directly fed into the refined ladle furnace outside the furnace through the alloy chute

0.5

3

Q235

Directly fed into the refined ladle furnace outside the furnace through the alloy chute

...

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PUM

PropertyMeasurementUnit
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Abstract

The invention relates to a method for accelerating the solidification of casting steel water, wherein it adds micro powder smaller than 20micrometer into steel water while the consumption is 0.05-5% of steel water, while said micro powder can be same material of steel water, or / and electrolyte iron powder. The corn shaper of said invention will not affect the components of steel water.

Description

technical field [0001] The invention relates to a molten steel continuous casting process in the metallurgical industry, in particular to a method for promoting fine-grain solidification of continuous casting molten steel. Background technique [0002] In the metallurgical industry, especially in the iron and steel smelting industry, the current solidification methods are mainly die casting and continuous casting. After cooling in the medium, it solidifies to form a steel ingot. The continuous casting is to pour the molten steel qualified for smelting through the continuous casting machine. The molten steel flows from the ladle to the tundish, then enters the crystallizer to start solidification, and finally sprays water in the secondary cooling section to obtain a completely solidified continuous casting slab. [0003] In the iron and steel metallurgy industry, most of the pouring of molten steel is carried out by continuous casting, and die casting is limited to the pouri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/108
Inventor 黄诚宋世炜牛龙
Owner WUHAN IRON & STEEL ENG TECH GROUP
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