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Liquid steel refining method using RH vacuum refining system

A vacuum refining and vacuum refining furnace technology, which is applied in the field of molten steel refining outside the furnace, can solve the problems of limited increase of circulation flow, decrease of air bubble extraction efficiency, and reduction of molten steel circulation flow, so as to increase circulation flow and improve refining effect , Improve the effect of circulation flow

Active Publication Date: 2016-11-23
MINMETALS YINGKOU MEDIUM PLATE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above approach has the following problems: 1) Although increasing the gas supply flow rate increases the circulation flow rate to a certain extent, when the gas supply flow rate is large, the proportion of the gas volume is relatively large, so that the suction efficiency of the bubbles decreases, On the contrary, the circulating flow rate of molten steel is reduced; 2) The diameter of the dipping tube is limited by the size of the ladle. When the size of the ladle has been determined, it is difficult to further increase the diameter of the dipping tube; 3) Vacuumizing the vacuum chamber consumes a lot of energy. It is not economical to reduce the residual pressure of the vacuum chamber to increase the circulation flow
However, this method has a very limited increase in circulation flow

Method used

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  • Liquid steel refining method using RH vacuum refining system
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  • Liquid steel refining method using RH vacuum refining system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] combine figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, a RH vacuum refining system in this embodiment includes a RH vacuum refining furnace, a ladle seat 500, a first gas supply device 610, a second gas supply device 620, a vacuum pump 700 and an alloy hopper 800, and the lower part of the RH vacuum refining furnace A ladle seat 500 is provided, and a ladle 501 is provided on the ladle seat 500. The RH vacuum refining furnace is respectively connected to the first gas supply device 610 and the second gas supply device 620 through gas pipelines, and the vacuum pump 700 is connected to the RH vacuum furnace through a suction pipe 702. The upper part of the vacuum refining furnace is connected, and the alloy hopper 800 is connected to the top of the RH vacuum refining furnace through a feeding pipe.

[0068] The above-mentioned RH vacuum refining furnace includes a vacuum chamber 400 and a dipping...

Embodiment 2

[0102] The basic content of this embodiment is the same as that of Embodiment 1, and the difference is that a kind of molten steel refining method using the RH vacuum refining system of this embodiment, in step 2: continue vacuuming, when the vacuum chamber of the RH vacuum refining furnace When the pressure of 400 is 6000Pa, adjust the argon gas supply flow rate of the first gas supply device 610 to: 0.8m 3 / min; the argon gas supply flow rate of the second gas supply device 620 is: 0.5m 3 / min; when the pressure of the vacuum chamber 400 of the RH vacuum refining furnace is 1500Pa, adjust the argon gas supply flow rate of the first gas supply device 610 to be: 1.8m 3 / min; the argon gas supply flow rate of the second gas supply device 620 is: 1.0m 3 / min; the area of ​​the upper bottom of the riser is greater than the area of ​​the lower bottom, and the area of ​​the horizontal section of the riser increases gradually along its axial direction from bottom to top, and the mo...

Embodiment 3

[0111] The basic content of this embodiment is the same as that of Embodiment 1, and the difference is that a kind of molten steel refining method using the RH vacuum refining system of this embodiment, in step 2: continue vacuuming, when the vacuum chamber of the RH vacuum refining furnace When the pressure of 400 is 6000Pa, adjust the argon gas supply flow rate of the first gas supply device 610 to: 0.8m 3 / min; the argon gas supply flow rate of the second gas supply device 620 is: 0.5m 3 / min; when the pressure of the vacuum chamber 400 of the RH vacuum refining furnace is 1500Pa, adjust the argon gas supply flow rate of the first gas supply device 610 to: 2.0m 3 / min; the argon gas supply flow rate of the second gas supply device 620 is: 1.2m 3 / min; the area of ​​the upper bottom of the riser is greater than the area of ​​the lower bottom, and the area of ​​the horizontal section of the riser increases gradually along its axial direction from bottom to top, and the molte...

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Abstract

The invention discloses a liquid steel refining method using an RH vacuum refining system and belongs to the technical field of secondary refining of liquid steel. The liquid steel refining method comprises the following steps: step 1, pretreatment, namely moving a steel ladle to a steel ladle well and immersing a dip pipe below the liquid level of the liquid steel; step 2, vacuum refining, namely vacuumizing an RH vacuum furnace of the RH vacuum refining system, blowing argon into a riser through lower-layer nozzles and upper-layer nozzles to allow the liquid steel to enter a vacuum chamber via the riser under the action of the argon and flow back into the steel ladle via a downcomer, and thus completing vacuum refining; and step 3, alloying, namely adding alloy raw materials to the liquid steel in the vacuum chamber via an alloy hopper for alloying. After the completion of the alloying, components of the liquid steel are detected, and the achievement of target components of the liquid steel indicates the completion of liquid steel refining. According to the vacuum refining method provided by the present invention, the saturation point of gas flow in the liquid steel is increased, such that the circular flow is increased, and gas distribution in the flow field of the liquid steel is also improved; thus, the refining effect of the liquid steel is enhanced.

Description

technical field [0001] The invention relates to the technical field of molten steel refining outside the furnace, and more specifically relates to a molten steel refining method using an RH vacuum refining system. Background technique [0002] RH is an out-of-furnace refining method for molten steel jointly designed and developed by Ruhrstahl and Hereaeus. [1] . The RH method is an important means of refining outside the furnace. It has the functions of degassing, decarburization, deoxidation, uniform composition and temperature of molten steel, and promoting the floating of non-metallic inclusions. The lower part of the RH vacuum refining furnace is equipped with a dipping tube. During the process of refining molten steel in the RH vacuum refining furnace, the lower dipping tube is inserted into the lower part of the ladle steel liquid surface, and the vacuum chamber is vacuumed, and then the rising tube is The lower part blows argon gas into the molten steel as a driving...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/072
CPCC21C7/0006C21C7/072C21C7/10
Inventor 岳强张成博裴晓航张炯张龙
Owner MINMETALS YINGKOU MEDIUM PLATE