A tundish free injection long nozzle structure and argon blowing smelting method

A smelting method and tundish technology, applied in the field of iron and steel metallurgy, can solve problems such as high energy consumption and maintenance costs, achieve the effects of saving gas source and energy consumption, and inhibiting secondary oxidation

Active Publication Date: 2021-10-29
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The improvement of the shroud in the existing technology is basically focused on reducing the impact on the tundish, preventing the pouring splash, improving the safety of the pouring, etc., and seldom designed from the aspect of improving the cleanliness of the molten steel; while the argon blowing smelting The process needs to continuously provide a source of argon gas with a certain pressure to the molten steel, resulting in high energy consumption and maintenance costs

Method used

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  • A tundish free injection long nozzle structure and argon blowing smelting method
  • A tundish free injection long nozzle structure and argon blowing smelting method

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Embodiment Construction

[0034]In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0035] Such as figure 1 As shown in the figure, it is a schematic structural view of the tundish free-flow shroud structure in a preferred embodiment of the present invention. figure 1 It is a tundish free injection shroud structure 100, which includes: an upper pipe section 11 and a second pipe 12, inside which respectively form a pipe hole 11A and a pipe hole 12A, and the pipe hole 11A and the pipe hole 12A are in communication. Wherein, the lower pipe section 12 is connected below the upper pipe section 11 , and the inner diameter of the pipe hole 12A is larger than the inner diameter of the pipe hole 11A. Preferably, the inner diameter of the tube hole 12A is 2-4 times, in this embodiment, 3 times, the inner diameter of the tube hole 11A. Wherein, the uppe...

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Abstract

The invention relates to a tundish free injection shroud structure, which comprises an upper pipe section and a lower pipe section, respectively forming pipe holes inside, and the pipe holes of the upper pipe section communicate with the pipe holes of the lower pipe section; the inner diameter of the pipe holes of the lower pipe section is larger than The inner diameter of the pipe hole of the upper pipe section is provided with an air hole on the lower pipe section, and the air hole is connected with the pipe hole inside the lower pipe section. The invention divides the traditional ladle shroud into a thinner upper pipe section and a thicker lower pipe section. The inner top surface of the lower pipe section is higher than the molten steel by a certain distance, forming an argon suction space between the lower pipe section and the liquid steel surface. After the molten steel flows out from the upper pipe section, it forms a free injection flow under gravity, and the argon gas in the argon suction space is entrained into the molten steel to form tiny argon bubbles, and the argon suction space relies on negative pressure to replenish argon by itself. The invention can not only suppress the increase of bubbles caused by non-wet conditions during the argon blowing process of the nozzle, but also avoid the blockage of the pores during the argon blowing process, the device is easy to maintain, and the molten steel can be realized at a lower cost. Deep cleansing.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a continuous casting tundish free injection shroud structure applied to clean steel smelting and an argon blowing smelting method using the shroud. Background technique [0002] At this stage, the steel industry is facing the dilemma of "overcapacity at the low end and insufficient production capacity at the high end". Under the increasingly stringent environmental pressure, improving the performance of steel and adjusting the product structure are the only way for the sustainable and healthy development of steel enterprises. At present, the number and maximum size of inclusions contained in some high value-added steel products should meet strict requirements. Therefore, minimizing the size and quantity of inclusions in steel and realizing the smelting of clean steel with high efficiency and low cost is an important way to improve product quality and increase the profita...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/58C21C7/072C21C7/076
CPCB22D41/58C21C7/072C21C7/076Y02P10/20
Inventor 常胜刘铮周吉安邹宗树邵磊曲迎霞
Owner NORTHEASTERN UNIV LIAONING
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