Method for effectively judging middle package water outlet burst

Abstract

The present application belongs to the technical field of steel production, and relates to a method for effectively judging tundish nozzle burst, which makes accurate judgment under different casting conditions by observing the change of the crystallizer protective slag combustion flame, and comprehensively adjusting the argon flow of the stopper and manually checking the liquid level of the crystallizer. The present application can timely find the signs of nozzle burst by observing the crystallizer protective slag combustion flame, improve the discernibility and observability of nozzle burst, and avoid quality accidents and the risk of steel leakage caused by nozzle burst. By comprehensively adjusting the argon flow of the stopper and manually checking the liquid level of the crystallizer, the condition of nozzle burst can be further confirmed, the accuracy and reliability of the judgment of nozzle burst are improved, and a basis is provided for the treatment of nozzle burst.

Description

Technical Field

[0001] This invention belongs to the field of steel production technology and relates to an effective method for determining the cracking of the tundish drain outlet. Background Technology

[0002] In continuous casting production, fractures and cracks of the tundish nozzle (hereinafter referred to as "nozzle nozzle") occur frequently due to various reasons. Common fractures at the slag line, causing the lower section of the nozzle to float and the liquid surface to churn, are easily identifiable and can be dealt with quickly. However, nozzle cracks, due to the uncertainty of their cause, location, and size, have lower observability and identifiability. Often, there is no obvious churn on the liquid surface in the crystallizer, and the black slag layer in the crystallizer does not show obvious fluctuations, making them difficult to identify. If they are not detected and countermeasures are not taken in time, uneven flow field in the crystallizer can easily lead to quality accidents such as adhesion, cracks, and inclusions, and in severe cases, even steel leakage.

[0003] Therefore, a method is needed to make timely and accurate judgments about sprue bursts. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to solve the above problems and provide an effective method for determining the cracking of the drain outlet of the package.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An effective method for judging the cracking of the tundish outlet is to observe the changes in the combustion flame of the protective slag in the crystallizer, and to make an accurate judgment under different casting conditions by combining the adjustment of the argon flow rate of the stopper rod and the manual inspection of the liquid level in the crystallizer.

[0007] Furthermore, the method for judging the sprue cracking during the start of casting is as follows: Within 5-10 minutes of start of casting, after the casting speed is increased to normal, the stopper rod argon gas is 1-3L / min, the flame of the mold flux is still around the sprue, the liquid surface of the mold is calm, and there are no active bubbles or flames in other areas; adjust the stopper rod argon gas to 1L / min, adjust the upper sprue argon gas to 3L / min, if there is no obvious change in the combustion state of the mold flux, and the liquid surface in other parts of the mold is calm with no active bubbles or flames, then it is initially judged that the sprue cracked after the start of casting. Then switch to manual casting and use an oxygen tube to lightly touch the liquid surface to check for sprue fragments for final confirmation.

[0008] Furthermore, the method for judging the cracking of the nozzle under normal casting conditions is as follows: Under normal conditions, the protective slag in the crystallizer burns at the narrow edge of the crystallizer, is bright yellow, and has a height of 200-300mm; within 1-3 minutes of casting, there is no obvious fluctuation in the liquid surface, the flame position moves from the narrow edge to one-quarter of the crystallizer, with a height of 300-500mm, the activity of the liquid surface in the crystallizer decreases, and the flame on the narrow edge disappears; after about 2 minutes of casting, the flame of the protective slag burns is concentrated around the nozzle, and the liquid surface in other parts of the crystallizer is quiet with no active bubbles and no flame; if the argon gas of the stopper rod is adjusted to 1L / min and the argon gas of the upper nozzle is adjusted to 3L / min, and there is no obvious change in the burning state of the protective slag in the crystallizer, and the activity of the liquid surface is low, then it is initially judged that the nozzle has cracked. Then, switch to manual casting and use an oxygen-burning tube to lightly touch the liquid surface to check for nozzle fragments for final confirmation.

[0009] The beneficial effects of this invention are as follows:

[0010] This invention, through observation of the combustion flame of the mold flux in the crystallizer, can promptly detect signs of nozzle cracking, improving the identification and observability of nozzle cracking and avoiding quality accidents and steel leakage risks caused by it. By combining the adjustment of the stopper rod argon flow rate and manual inspection of the crystallizer liquid level, the condition of the nozzle cracking can be further confirmed, improving the accuracy and reliability of nozzle cracking judgment and providing a basis for handling nozzle cracking.

[0011] The method of the present invention is simple and easy to implement, requires no additional equipment or cost, is applicable to different casting situations, and has strong practicality and universality.

[0012] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0013] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0014] Figure 1 This is a schematic diagram of the process for effectively determining the cracking of the drain outlet of the intermediate package in this invention. Detailed Implementation

[0015] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0016] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0017] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0018] Please see Figure 1 An effective method for judging the cracking of the tundish outlet is to observe the changes in the combustion flame of the protective slag in the crystallizer, and to make accurate judgments under different casting conditions by combining the adjustment of the argon flow rate of the stopper rod and the manual inspection of the liquid level in the crystallizer.

[0019] The method for judging the sprue cracking at the start of casting is as follows: Within 5-10 minutes of starting casting, after the casting speed is increased to normal, the stopper rod argon gas is 1-3L / min, the flame of the protective slag in the crystallizer is still around the sprue, the liquid surface in the crystallizer is calm, and there are no active bubbles or flames in other areas; adjust the stopper rod argon gas to 1L / min and adjust the upper sprue argon gas to 3L / min. If there is no obvious change in the combustion state of the protective slag in the crystallizer, and the liquid surface in other parts of the crystallizer is calm with no active bubbles or flames, it is initially judged that the sprue cracked after starting casting. Then switch to manual casting and use an oxygen-burning tube to lightly touch the liquid surface to check for sprue fragments for final confirmation.

[0020] The method for judging the cracking of the nozzle under normal casting conditions is as follows: Under normal conditions, the protective slag in the crystallizer burns at the narrow edge of the crystallizer, is bright yellow, and is 200-300mm high; within 1-3 minutes of casting, there is no obvious fluctuation in the liquid surface, the flame position moves from the narrow edge to one-quarter of the crystallizer, and the height is 300-500mm, the activity of the liquid surface in the crystallizer decreases, and the flame on the narrow edge disappears; after about 2 minutes of casting, the flame of the protective slag burns is concentrated around the nozzle, and the liquid surface in other parts of the crystallizer is quiet with no active bubbles and no flame; if the argon gas of the stopper rod is adjusted to 1L / min and the argon gas of the upper nozzle is adjusted to 3L / min, and there is no obvious change in the burning state of the protective slag in the crystallizer, and the activity of the liquid surface is low, then it is initially judged that the nozzle has cracked. Then, switch to manual casting and use an oxygen-burning tube to lightly touch the liquid surface to check for nozzle fragments for final confirmation.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for effectively determining the cracking of the drain outlet of a water tank, characterized in that: By observing the changes in the combustion flame of the mold mold protective slag, and by combining the adjustment of the argon flow rate of the stopper rod with manual inspection of the liquid level in the mold mold, accurate judgments can be made under different casting conditions. The method for judging the sprue cracking at the start of casting is as follows: Within 5-10 minutes of starting casting, after the casting speed is increased to normal, the stopper rod argon gas is 1-3L / min, the flame of the protective slag in the crystallizer is still around the sprue, the liquid surface in the crystallizer is calm, and there are no active bubbles or flames in other areas; adjust the stopper rod argon gas to 1L / min and adjust the upper sprue argon gas to 3L / min. If there is no obvious change in the combustion state of the protective slag in the crystallizer, and the liquid surface in other parts of the crystallizer is calm with no active bubbles or flames, it is preliminarily judged that the sprue cracked after starting casting. Then switch to manual casting and use an oxygen tube to lightly touch the liquid surface to check for sprue fragments for final confirmation. The method for judging the cracking of the nozzle under normal casting conditions is as follows: Under normal conditions, the protective slag in the crystallizer burns at the narrow edge of the crystallizer, is bright yellow, and is 200-300mm high; within 1-3 minutes of casting, there is no obvious fluctuation in the liquid surface, the flame position moves from the narrow edge to one-quarter of the crystallizer, and the height is 300-500mm, the activity of the liquid surface in the crystallizer decreases, and the flame on the narrow edge disappears; after 2 minutes of casting, the flame of the protective slag burns is concentrated around the nozzle, and the liquid surface in other parts of the crystallizer is quiet with no active bubbles and no flame; if the argon gas of the stopper rod is adjusted to 1L / min and the argon gas of the upper nozzle is adjusted to 3L / min, and there is no obvious change in the burning state of the protective slag in the crystallizer, and the activity of the liquid surface is low, then it is initially judged that the nozzle has cracked. Then switch to manual casting and use an oxygen-burning tube to lightly touch the liquid surface to check for nozzle fragments for final confirmation.

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