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Argon blowing protection system

A protection system and protection device technology, applied in the field of molten steel refining outside the furnace, can solve the problems of slow denitrification speed, difficult denitrification, slow nitrogen diffusion speed, etc., to achieve increased nitrogen content, smooth process flow, and high steel tapping rate Effect

Inactive Publication Date: 2010-11-24
CHINA NAT HEAVY MACHINERY RES INSTCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in fact, due to the slow diffusion rate of nitrogen, the denitrification rate is also very slow. In the case of low original nitrogen content in the steel, it is very difficult to denitrify during the RH vacuum refining process, and sometimes even due to the leakage of the RH vacuum chamber. Gas or driving gas argon is impure and nitrogen can be added. Only when the original nitrogen content in the steel is relatively high can it have a certain denitrification efficiency. Nitrogen increase during vacuum treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1, such as figure 1 As shown, the argon blowing protection valve station 3 is connected to the argon blowing protection device 1 through the connecting hose 2, the protective gas argon 20 is decompressed through the argon blowing protection valve station 3 and then enters the argon blowing protection device 1 through the connecting hose 2, and the blowing The argon protection device 1 is located above the liquid steel surface, and the wire 4 output by the wire feeder enters the argon gas 20 atmosphere in the argon blowing protection device 1 from the center of the upper end of the argon blowing protection device 1, and is finally inserted into the molten steel to insulate the steel. The liquid and the splashed molten steel are in contact with the nitrogen fertilizer in the air, which can prevent the nitrogen from melting into the molten steel to increase the content of nitrogen.

Embodiment 2

[0025] Example 2, such as figure 2 As shown, the argon blowing protection device 1 is composed of a nozzle 5, an adjustment arm 6, an adjustment nut 7, a lock nut 8, and a support frame 9. The nozzle 5 is fixedly connected to one end of the adjustment arm 6, and the other end of the adjustment arm 6 is adjusted The nut 7 and the locking nut 8 are connected with the support frame 9. The level of the nozzle 5 is not higher than the level of the bottom end of the support frame 9. The nozzle 5 adjusts the size of the spray surface by rotating the adjustment nut 7, and the rotation adjustment nut 7 moves along the support frame. The outer wall of the frame 9 moves up and down, and the adjustment nut 7 drives the adjustment arm 6 to move up and down. The adjustment of the height of the adjustment arm 6 makes the size of the circular surface formed by the argon gas 20 ejected from the nozzle 5 on the liquid steel surface adjusted. According to the requirements of the wire feeding pro...

Embodiment 3

[0026] Example 3, such as image 3 As shown, for the single-wire wire feeding machine, the support frame 9 is circular, and the center of the circular center of the support frame 9 forms a circular through hole sufficient for the passage of the wire 4, and the outer wall of the support frame 9 is distributed through six adjustment arms 6. There are 6 nozzles 5, and the 6 nozzles 5 are evenly distributed on the outer circumference of the support frame 9 by six equal divisions.

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Abstract

The invention relates to the technical field of external refining of molten steel, in particular to an argon blowing protection system for thread feeding during the external refining of molten steel. The argon blowing protection system is characterized in that an argon blowing protection valve station is divided into a compressed air or nitrogen delivery line and an argon delivery line, and the output ends of the two lines are connected with a nozzle of an argon blowing protection device through a connecting hose; the argon blowing protection device comprises the nozzle, an adjusting arm, an adjusting nut, a locking nut and a supporting frame; and the nozzle is fixedly connected with one end of the adjusting arm, while the other end of the adjusting arm is connected with the supporting frame through the adjusting nut and the locking nut. In the argon blowing protection system, the molten steel is not in contact with air during thread feeding so as to keep an inert gas atmosphere in the process of thread feeding and maintain that the nitrogen content in the molten steel is not increased during thread feeding; and the contact of the molten steel and the air can be separated so as to prevent the nitrogen in the air from being dissolved in the molten steel to generate adverse impact on the molten steel.

Description

technical field [0001] The invention relates to the technical field of molten steel refining outside the furnace, in particular to an argon blowing protection system for feeding wire during the refining of molten steel outside the furnace. Background technique [0002] Nitrogen in steel reduces the properties of the steel material under certain conditions. Due to the presence of nitrogen, the toughness, welding performance, and toughness of the thermal stress zone of the steel are reduced, and the brittleness of the steel is increased; on the other hand, nitrogen can cause continuous casting slabs to crack. Therefore, some high-quality steels should strictly control the nitrogen content. [0003] The wire feeder is a new type of equipment in the steelmaking process since the 1990s. It is used to inject the alloy core wire into the depth of the molten steel at an appropriate speed and a set amount to make it evenly dispersed to achieve deoxidation, change the shape of inclusi...

Claims

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Application Information

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IPC IPC(8): C21C7/10C21C7/072
Inventor 任彤方杞清陈亚文张钰董伟光
Owner CHINA NAT HEAVY MACHINERY RES INSTCO
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