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Cored wire for modifying and removing foreign materials in container filled with steel

A technology for steel container and cored wire, applied in the field of cored wire, can solve the problems of increased cost, low yield, low calcium density, etc., and achieve the effect of reducing smelting cost, low economic value, and improving purity.

Inactive Publication Date: 2012-01-11
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in production and application, due to the low density of calcium, high vapor pressure, and high chemical activity, the yield of calcium is low when adding calcium to steel, and it is easily affected by factors such as molten steel deoxidation, steel slag oxidation, and sulfur in steel. Calcium yield is extremely unstable
As a result, the calcium content in the steel is low or high, which leads to an increase in cost
In addition, most of the inclusions in molten steel are removed by buoyancy. However, in the continuous casting production, the efficiency of natural flotation is very low and cannot meet the production requirements. Therefore, ladle bottom blowing and tundish flow field are often used. Optimized to meet the adsorption and flotation of inclusions
In addition, methods such as blowing argon throughout the ladle pouring process and stabilizing the liquid surface of the tundish can avoid secondary oxidation of molten steel to a certain extent, but large-scale production is mainly to control large particle inclusions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In a large-scale domestic steel mill, the steel type is high-strength low-alloy steel. The ladle enters the LF station. After temperature measurement and sampling, alloying, electric heating or Al wire feeding, the bottom blowing volume is reduced, and the cored wire is fed. The basic composition of the core wire is: CaO: 50%, SiO 2 : 6%, Ca: 7%, CaF 2 : 15%, Al 2 o 3: 10%, MgO: 5%, Fe: 7%, the diameter of the core wire is Ф11mm, the wire feeding speed is controlled at 1-4m / s, the feeding amount is 900-1100m / furnace, and the argon blowing is continued for more than 3 minutes after the wire feeding is completed . Through chemical analysis, the maximum w(S) content in the steel before feeding the wire was 0.004%, and the w(S) content in the steel decreased to 0.001% after feeding the wire. T[O] in the slab decreased from an average value of 40ppm to 13-17ppm. The morphology and quantity of inclusions in the slab were analyzed with a 500-fold microscope. All kinds of i...

Embodiment 2

[0040] In a large steel mill in China, the steel type is high-strength container steel. The ladle enters the LF station. After temperature measurement and sampling, alloying, electric heating or Al wire feeding, the bottom blowing gas volume is weakened, and the cored wire is fed. The basic composition is: CaO: 40%, SiO 2 : 15%, Ca: 8%, CaF 2 : 7%, CaO·Al 2 o 3 : 25%, MgO: 5%, the diameter of the core wire is Ф10mm, the wire feeding speed is controlled at 1-4m / s, the feeding amount is 700-1000m / furnace, and the argon blowing continues for more than 3 minutes after the wire feeding is completed. The same core wire is fed into the turbulence device of the continuous casting tundish to protect the pouring in the whole process. Through the electron microscope analysis of the nozzle bond, there is basically only a small amount of pure Al at the normal pouring temperature of the steel 2 o 3 Inclusions, mostly calcium-containing oxidized composite inclusions, prove that high mel...

Embodiment 3

[0042] In a large domestic steel mill, the steel type is Q450 weather-resistant steel. The ladle enters the LF station. After temperature measurement and sampling, alloying, electric heating or Al wire feeding, the bottom blowing gas volume is reduced, and the cored wire is fed. The core wire is basically The composition is: CaO: 25%, SiO 2 : 25%, Ca: 15%, CaF 2 : 14%, 3CaO·Al 2 o 3 : 10%, MgO: 6%, Fe: 5%, the diameter of the core wire is Ф13mm, the wire feeding speed is controlled at 1-4m / s, the feeding amount is 1000-1200m / furnace, and the argon blowing is continued for more than 3 minutes after the wire feeding is completed . Through chemical analysis, the maximum w(S) content in the steel before feeding the wire is 0.0078%, respectively, and the w(S) content in the steel directly decreases by 0.0052% after feeding the wire. The T[O] in the slab decreased from an average of 34.0ppm to 14.8ppm, and the morphology and quantity of inclusions in the slab were analyzed with ...

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PUM

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Abstract

The present invention discloses a cored wire for modifying and removing foreign materials in a container filled with steel. The wire core components of the cored wire comprise, by mass, 20-90% of CaO, 9-45% of Al2O3 and 1-35% of CaF. With the cored wire, the formations, the sizes and the quantity distributions of the foreign materials in the molten steel can be stabilized; the foreign materials in the molten steel can be effectively removed; the smelting cost can be reduced; the purity of the molten steel can be improved; the traditional calcium treatment of the aluminum-killed steel can be replaced.

Description

technical field [0001] The invention relates to a cored wire used in steelmaking, mainly used in the refining and continuous casting process of aluminum-killed steel and silicon-aluminum killed steel. It can solve the flocculation of various aluminum-killed steels and silicon-aluminum killed steels, improve the shape of inclusions and reduce the number of inclusions. [0002] Background technique [0003] In the continuous casting process, the submerged nozzle for continuous casting has the function of controlling the injection amount of molten steel from the tundish to the mold and the flow of molten steel in the mold, which plays a very important role in stable operation and quality assurance. If alumina is attached to the inner wall of the submerged nozzle, it will cause partial flow of molten steel in the nozzle and fluctuations in the liquid level of molten steel in the mold, which will not only deteriorate the quality of the slab, but also hinder the advancement of mu...

Claims

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Application Information

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IPC IPC(8): C21C7/04
Inventor 王谦赵烁鲁永剑李玉刚何生平杨颖
Owner CHONGQING UNIV
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