A high-quality steel continuous casting argon blowing stopper, stopper argon blowing system and argon blowing method

A high-quality stopper technology, applied in casting equipment, casting melt containers, manufacturing tools, etc., can solve problems such as argon blowing flow rate not suitable for casting conditions, fluctuations and tumbling of steel slag interface in mold, secondary oxidation of molten steel, etc. To achieve the effect of preventing severe fluctuations and tumbling of steel slag interface, improving size and distribution state, and preventing secondary oxidation of molten steel

Active Publication Date: 2021-08-31
MAANSHAN MAGANG JINXI RAIL TRANSPORT EQUIP +1
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  • Application Information

AI Technical Summary

Problems solved by technology

The existing treatment methods have a certain effect on preventing nodulation and clogging of the nozzle, but there are also certain problems and limitations: 1. There are certain limitations in the design of the argon channel inside the stopper rod, and the head area of ​​the stopper rod is pre-treated Embedding high-temperature-resistant straight pipes to realize argon gas circulation, the size of argon bubbles entering the molten steel in this way is relatively large, and the degree of dispersion is poor. The effect of improving inclusions on the nozzle bowl and inner wall is limited, and this design is very easy 2. According to the actual situation on site, the diameter of the argon gas outlet at the head of the stopper rod is too large, and it is very easy to form a negative pressure in the main channel cavity inside the stopper rod under the action of steel flow. The connection with the argon blowing pipe is a high-temperature hard connection. When the argon pressure and flow rate are not suitable, it is very easy to inhale air from this connection, resulting in serious secondary oxidation of molten steel; the diameter of the argon outlet at the head of the stopper is too small, and the argon The gas outlet pressure is too high, the gas impact depth is deep, the probability of argon bubbles dispersing to the inner wall of the nozzle is low, the effect of argon blowing to improve the casting state is not good, and even the interface of the steel slag in the crystallizer fluctuates seriously.
3. The change of the rod position during the casting process reflects the degree of nodulation of inclusions on the inner wall of the nozzle or the erosion of the refractory material of the nozzle, while the flow rate of argon blowing in the existing casting process is constant, or only within a set period of time Then start to adjust the flow of argon blowing, so that the flow of argon blowing does not adapt to the actual casting conditions
If the liquid level of molten steel in the crystallizer drops greatly, the stopper rod position needs to be raised upwards, and there is a certain degree of inclusions attached to the inner wall of the nozzle, and the inclusions continue to adhere or fall off on the bowl and inner wall of the nozzle, which seriously affects the Continuous Casting Casting Stability and Liquid Steel Quality

Method used

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  • A high-quality steel continuous casting argon blowing stopper, stopper argon blowing system and argon blowing method
  • A high-quality steel continuous casting argon blowing stopper, stopper argon blowing system and argon blowing method
  • A high-quality steel continuous casting argon blowing stopper, stopper argon blowing system and argon blowing method

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Embodiment 1: Taking sulfur-free high-quality steel with an aluminum content of 0.025% as an example, the method of continuously casting argon-blowing high-quality steel using the above-mentioned argon blowing system and the resulting effect will be described in detail. The method of continuous casting argon blowing comprises the following steps:

[0040] 1) Before continuous casting, when the molten steel flows into the tundish 6, the source of argon is turned on, and argon is supplied to the gas channel 3 of the continuous casting argon-blowing stopper rod, and the pressure of the argon supply is kept at 0.3Mpa. The flow rate is 2.0L / min, and the flow is continued for 10 minutes to keep the gas channel 3 unblocked;

[0041] 2) The continuous casting argon blowing stopper rod is lifted to make the molten steel enter the crystallizer 8, keep the argon gas supply pressure at 0.3Mpa, increase the argon gas flow rate to 4.0L / min, and continue to feed it for 15 minutes, and...

Embodiment 2

[0044] Example 2: Taking sulfur-containing aluminum-containing high-quality steel with an aluminum content of 0.025% and a sulfur content of 0.020% as an example, the method of continuously casting argon-blowing high-quality steel using the above-mentioned argon blowing system and the resulting effect will be explained in detail . The method of continuous casting argon blowing comprises the following steps:

[0045] 1) Before continuous casting, when the molten steel flows into the tundish 6, the source of argon is turned on, and argon is supplied to the gas channel 3 of the continuous casting argon-blowing stopper rod, and the pressure of the argon supply is maintained at 0.4Mpa. The flow rate is 3.0L / min, and it is continuously fed for 10 minutes to keep the gas channel 3 unblocked;

[0046] 2) The continuous casting argon blowing stopper rod is lifted to make the molten steel enter the crystallizer 8, keep the argon gas supply pressure at 0.4Mpa, increase the flow rate of ...

Embodiment 3

[0049] Example 3: Taking high-sulfur, high-aluminum high-quality steel with an aluminum content of 0.040% and a sulfur content of 0.025% as an example, the method of continuously casting and blowing argon on high-quality steel using the above-mentioned argon blowing system and the resulting effects . The method for continuous casting argon blowing comprises the following steps:

[0050] 1) Before continuous casting, when the molten steel flows into the tundish 6, the source of argon is turned on, and argon is supplied to the gas channel 3 of the continuous casting argon-blowing stopper rod, and the pressure of the argon supply is maintained at 0.5Mpa, and the argon The flow rate is 3.0L / min, and it is continuously fed for 10 minutes to keep the gas channel 3 unblocked;

[0051] 2) The continuous casting argon blowing stopper rod is lifted to make the molten steel enter the crystallizer 8, keep the argon gas supply pressure at 0.5Mpa, increase the flow rate of the argon gas to...

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Abstract

A high-quality steel continuous casting argon blowing stopper, stopper argon blowing system and argon blowing method, belonging to the technical field of steelmaking and continuous casting, the gas channel in the argon blowing stopper includes a main channel, a diffusion gas chamber and a slit type Channel, the central axis of the stopper rod body is provided with a main channel, the head of the stopper is provided with a diffusion chamber and multiple slit channels, one end of the main channel is connected to the gas supply pipeline, and the other end of the main channel is connected to multiple Two slit channels are connected, and the outlets of multiple slit channels are dispersedly arranged on the bottom surface of the stopper rod head. In the argon blowing system, the displacement sensor for detecting the displacement of the stopper rod passes through the PLC and the flow control valve for controlling the flow of argon gas. Connected, the beneficial effect of the present invention is that the present invention improves the size and distribution of argon gas bubbles entering molten steel, and dynamically adjusts the flow of argon gas in the stopper rod according to the actual casting process, effectively improving the nozzle bowl and inner wall. Inclusion nodules state and continuous casting casting state improve the quality of molten steel.

Description

technical field [0001] The invention relates to the technical field of steelmaking and continuous casting, in particular to a high-quality steel continuous casting argon blowing stopper, a stopper argon blowing system and an argon blowing method. Background technique [0002] In the process of steelmaking, aluminum deoxidation is mostly used for deoxidation of molten steel, especially aluminum-containing steel. Therefore, there is a certain amount of alumina-like inclusions in molten steel. In order to meet the pourability, calcium treatment is usually used. However, for some high-quality metallurgical products, in order to meet special performance and quality requirements, there are strict requirements on DS inclusions in steel, and calcium treatment measures cannot be used in the smelting process. In the continuous casting process of this type of product, the nozzle of the crystallizer is very easy to nodulate and block, the casting stability of the continuous casting is p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/18B22D41/58B22D11/18B22D2/00B22D11/117
CPCB22D2/00B22D11/117B22D11/18B22D41/186B22D41/58
Inventor 金友林杜松林
Owner MAANSHAN MAGANG JINXI RAIL TRANSPORT EQUIP
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