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Argon-blowing prefabricated member for continuous casting tundish cover

A technology of continuous casting tundish and prefabricated parts, which is applied in the direction of manufacturing tools, casting equipment, casting melt containers, etc. It can solve the problems of time-consuming and labor-intensive costs, deformation of the tundish cover, and erosion of the tundish cover, so as to ensure the metallurgical effect , Reduced replacement frequency and extended service life

Inactive Publication Date: 2011-09-14
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large thermal conductivity and poor oxidation resistance of the all-cast iron or cast steel tundish cover, problems such as corrosion, sticking to steel, deformation, and cracking may occur during use, resulting in a low actual service life of the tundish cover; The steel structure-refractory composite structure tundish cover has been greatly improved in terms of thermal insulation and service life by taking measures such as improving the cover structure and optimizing materials, but there are still the following disadvantages: the tundish cover (especially Around the baking hole), the inner lining is delaminated and dropped, blocking the upper nozzle of the tundish, resulting in pouring accidents and serious deformation of the cover in the later stage of pouring, poor sealing performance of the tundish, and increased secondary oxidation of molten steel, etc.
The average amount of nitrogen increase after argon blowing using the present invention is 9ppm, which is 18ppm less than that without argon blowing, which plays a positive role in reducing the oxide inclusions of the slab and improving the quality of the slab, but the device has the following disadvantages: 1. , During the baking and pouring process, the lining of the tundish cover (especially around the baking hole) is easy to delaminate and drop materials, which will block the upper nozzle of the tundish, resulting in pouring accidents and serious deformation of the cover in the later stage of pouring. Short life; 2. The baking holes, feeding holes and pouring holes on the tundish cover are easily deformed, the hole walls are cracked, and the replacement frequency of the tundish cover is increased. Frequent replacement of the tundish cover is time-consuming, laborious and costly; 3. The cover Poor sealing and heat preservation effects, temperature drop of molten steel and increased degree of secondary oxidation

Method used

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  • Argon-blowing prefabricated member for continuous casting tundish cover
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  • Argon-blowing prefabricated member for continuous casting tundish cover

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 , figure 2 As shown, an argon-blowing preform for continuous casting tundish cover includes a preform body 1, which is hollow, and a ventilation duct is arranged in the preform body 1, and the ventilation duct includes an upper annular channel 3 and a branch channel 4 that communicates with the annular channel 3 and extends downwards. The upper part of the preform body 1 is provided with a vent hole 2 that communicates with the vent pipe. The shape of the preform body 1 is a frustum of a cone whose upper base radius is greater than that of the lower base. The end of the branch channel 4 is bent toward the side of the prefabricated body 1, and the bent end is a horizontal outlet, and the outlet is 15 mm away from the bottom surface of the prefabricated body 1. There are 4 branch passages 4, and 1 annular passage.

[0038] There are multiple openings on the annular passage 3, the branch passage 4 communicates with the annular passage 3 through the ope...

Embodiment 2

[0047] Such as image 3 , Figure 4 As shown, with the argon-blowing preform for continuous casting tundish cover described in Example 1, the difference is:

[0048] The ends of the branch channels 4 extend vertically downward to the bottom surface of the preform body, and there are three branch channels 4 .

[0049] It is suitable for driving away the air in the tundish before continuous casting and preventing secondary oxidation of molten steel.

[0050] With the present invention, under the same process conditions, the service life of the tundish cover can be improved. The traditional tundish cover is replaced every 200 hours. After using the prefabricated part of the present invention, the tundish cover can be used for more than 450 hours. Compared with the traditional cover, it is more convenient to replace the argon-blown prefabricated part for continuous casting tundish cover of the present invention, save time and labor, and reduce the cost; the replacement time and ...

Embodiment 3

[0054] Such as Figure 5 , Figure 6 As shown, with the argon-blowing preform for continuous casting tundish cover described in Example 1, the difference is:

[0055] The profile of the prefabricated body 1 has a longitudinal section structure of T shape, the end of the branch channel is bent to the side of the prefabricated body, the curved end is a horizontal outlet, the outlet is 20 mm away from the bottom surface of the prefabricated body 1, and there are 3 branched channels 4 .

[0056] With the present invention, under the same process conditions, the service life of the tundish cover can be improved. The traditional tundish cover is replaced every 200 hours. After using the prefabricated part of the present invention, the tundish cover can be used for more than 450 hours. Compared with the traditional cover, it is more convenient to replace the argon blowing prefabricated part for the continuous casting tundish cover of the present invention, save time and labor, and r...

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Abstract

The invention relates to an argon-blowing prefabricated member for a continuous casting tundish cover and belongs to the technical field of ferrous metallurgical equipment. Argon-blowing prefabricated members with difference sizes can be designed according to the size of a baking hole, a charging hole, a plug hole and the like of the tundish cover. The argon-blowing prefabricated member comprisesa prefabricated member body; the argon-blowing prefabricated member body has a shape of a cone of which the radius of the upper bottom is greater than that of the lower bottom, or the longitudinal section structure of the prefabricated member body is T-shaped. The prefabricated member body is hollow, an aeration pipeline is arranged in the prefabricated member body, and the prefabricated member body is provided with an aeration hole communicated with the aeration pipeline. The argon-blowing prefabricated member solves the problems that the peripheries of the baking hole and the plug hole are deformed and refractory materials fall off, and guarantee the cast-on can be performed smoothly; and the tightness of the tundish cover is improved, the reduction of the molten steel temperature is inhibited, the molten steel is prevented from being oxidized for secondary time, and meanwhile, the service life of the tundish cover can be prolonged.

Description

technical field [0001] The invention relates to an argon-blowing preform for continuous casting tundish covers, and belongs to the technical field of iron and steel metallurgical equipment. Background technique [0002] With the rapid development of metallurgical technology and the further improvement of users' requirements for steel cleanliness and quality, the continuous casting tundish, as the last container for liquid steel in the steelmaking production process, has been used only as a liquid steel storage and The simple container of the distributor is transformed into a multifunctional metallurgical reactor with the functions of preventing secondary oxidation of molten steel, removing inclusions in steel, improving cleanliness of molten steel, and microalloying. [0003] The tundish is generally equipped with a tundish cover, and the tundish cover is generally equipped with a stopper rod installation hole, a baking hole, a pouring hole, a feeding hole, a temperature mea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/117B22D11/10B22D41/00
Inventor 李法兴孙永喜马传庆张伟时振明欧阳峥嵘郑桂云马佐仓刘永昌杜国强
Owner LAIWU IRON & STEEL GRP
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