CN111230086A - Method for inhibiting erosion of continuous casting nozzle by using potential elimination method - Google Patents
Method for inhibiting erosion of continuous casting nozzle by using potential elimination method Download PDFInfo
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- CN111230086A CN111230086A CN202010187064.2A CN202010187064A CN111230086A CN 111230086 A CN111230086 A CN 111230086A CN 202010187064 A CN202010187064 A CN 202010187064A CN 111230086 A CN111230086 A CN 111230086A
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- continuous casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/505—Rings, inserts or other means preventing external nozzle erosion by the slag
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Abstract
The invention discloses a method for inhibiting erosion of a continuous casting nozzle by using a potential elimination method, and relates to the technical field of steelmaking and continuous casting production. The method specifically comprises the steps of slotting the outer wall of a continuous casting nozzle, embedding a metal wire, coating a layer of molten glass, and sealing by using high-temperature cement and refractory cotton before the molten steel casting process begins. When the pouring is started, the other end of the metal wire is connected to the plug rod wiring position, so that the continuous casting nozzle, the molten steel and the plug rod form a closed conductive loop, the electric field between the nozzle and the molten steel interface is eliminated, and the purpose of inhibiting the continuous casting nozzle from corroding is achieved. The invention has the advantages of low treatment cost, simple and convenient operation method, obvious effect of inhibiting the erosion of the water gap and the like.
Description
Technical Field
The invention relates to the technical field of billet continuous casting production, in particular to a method for inhibiting erosion of a continuous casting nozzle by using a potential elimination method.
Background
In recent years, with the development of continuous casting technology, higher demands have been made on the service life and metallurgical effect of a functional refractory for continuous casting. During the pouring process, the erosion suffered by the continuous casting nozzle is divided into two types, namely physical erosion and chemical erosion, including erosion of a slag line part (erosion caused by slag and slag-metal interface) and erosion of an inner wall (erosion caused by adhesion and deposition of molten steel and inclusions). The corroded and peeled nozzle refractory material and nozzle nodules enter molten steel to become large-particle inclusions, and the quality of the steel billet is seriously affected. Therefore, the erosion mechanism of molten steel and slag on the submerged nozzle is determined, the melting loss is reduced, and the method has important significance for prolonging the service life of the nozzle and reducing the pollution to the molten steel.
The erosion of the slag line part is mainly determined by wetting behavior between slag and materials at the slag line part of a continuous casting nozzle, the erosion of the inner wall of the continuous casting nozzle is mainly caused by molten steel or inclusions in the molten steel, and the decarburization reaction is a main root cause of erosion of carbon-containing materials on the working surface of the molten steel and is also related to the wettability between the materials at the inner wall of the nozzle and the molten steel. It follows that the wetting behavior between multiphase interfaces is a critical factor in the erosion of a continuous casting nozzle. Recent research shows that the molten steel flowing at high speed in the pouring process can generate a transient friction charge phenomenon with the wall surface of a water gap to form a stable interface electric field. In addition, the application of the electromagnetic technology in tundish metallurgy enables molten steel and refractory materials to be in an electric field environment at any time. The electrowetting effect generated by the interface electric field is an important factor influencing the wetting behavior among multiple phases, so that the decarburization behavior of the surface of the nozzle is promoted, and the electric field existing in the interface also promotes the movement of ions or ion groups in the slag, thereby further promoting the erosion of the slag line and the inner wall of the continuous casting nozzle. Based on the defects of the prior technology for preventing or inhibiting the erosion of the continuous casting nozzle, the invention eliminates the potential difference between the continuous casting nozzle and molten steel or molten slag in the pouring process by a potential elimination method through field industrial tests and by combining with an electrostatic elimination technology, thereby achieving the purpose of preventing or inhibiting the erosion of the continuous casting nozzle.
Disclosure of Invention
The invention aims to provide a method for inhibiting erosion of a continuous casting nozzle caused by an interface electric field by eliminating the interface electric field between high-speed flowing molten steel and the wall surface of the nozzle.
The invention adopts the following technical scheme:
a method of inhibiting erosion in a continuous casting nozzle by potential elimination comprising:
before the molten steel casting process is started, one end of a metal conducting wire is connected to the stopper rod, and the other end of the metal conducting wire is connected to the continuous casting water gap.
The melting point of the metal wire is more than 1200 ℃, and the metal wire of iron, cobalt, nickel, chromium and the like can be selected.
And (3) grooving the outer wall of the continuous casting nozzle, embedding a metal wire, coating high-temperature refractory cement and glass water to seal the metal wire, and finally coating the metal wire by using refractory cotton.
The invention has the beneficial effects that:
1. the operation is simple and convenient, and the treatment cost is low. The invention is suitable for pouring steel grades with various components, and the interface electric field generated between high-speed flowing molten steel and the wall surface of the nozzle can be eliminated only by connecting the continuous casting nozzle and the stopper rod through a metal wire before the pouring process is started, thereby achieving the purpose of inhibiting the nozzle erosion. The operation is simple and convenient, the implementation is easy, and the treatment cost is extremely low.
2. The inhibition effect is obvious. Through production practical verification, the method can obviously inhibit the erosion problem of the continuous casting nozzle in the pouring process, thereby prolonging the service life of the nozzle, stabilizing the pouring process and improving the quality of steel billets.
Drawings
FIG. 1 is a schematic diagram of a field device connection for potential cancellation according to the present invention.
FIG. 2 is a macro topography of a continuous casting nozzle after the existence of treatment by a potential elimination method; (a) not processing, (b) potential cancellation processing.
Detailed Description
The method of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of the field equipment wiring of the method for inhibiting erosion of a continuous casting nozzle by using a potential elimination method according to the invention. For suppressing aluminum-carbon (Al) by potential elimination method in pouring ultra-low carbon aluminum killed steel2O3-C) one embodiment of a technical method of continuous casting nozzle erosion.
The outer wall of an aluminum-carbon continuous casting nozzle 3 for standby production is provided with a groove (the groove is positioned above a slag line and is 200-300mm away from the slag line), the depth is about 5mm, one end of a metal chromium wire 5 is embedded into the groove opening, a layer of glass water is coated on the metal chromium wire, the metal chromium wire is sealed by high-temperature cement, and the aluminum-carbon continuous casting nozzle enters a conventional baking procedure after standing for 5 min.
The disposed continuous casting nozzle 3 is arranged on a tundish 1 of a continuous casting machine and is inserted into a crystallizer 4, a slot of the continuous casting nozzle 3 is well coated by high-temperature refractory cotton, and the other end of a metal chromium wire 5 is connected to a connecting wire of a stopper 2, so that the continuous casting nozzle 3, molten steel and the stopper 2 form a closed conductive loop, as shown in fig. 1. So as to eliminate or neutralize the electric charge generated by the friction between the wall surface of the continuous casting nozzle and the molten steel, namely eliminate the electric field between the nozzle and the molten steel interface.
And (3) selecting a pouring platform with two flows of one machine for testing, and filling the treated water gap into one flow as a test flow and the other flow as a contrast flow. The notch of the test water gap is well coated by high-temperature refractory cotton, and the other end of the metal chromium wire is connected to the connecting wire of the stopper rod, so that the continuous casting water gap, the molten steel and the stopper rod form a closed conductive loop, as shown in figure 1, thereby eliminating or neutralizing charges generated by the friction between the wall surface of the continuous casting water gap and the molten steel, namely eliminating an electric field between the water gap and a molten steel interface.
And after the pouring is finished, taking down the test flow and the contrast flow to examine the macroscopic erosion morphology of the continuous casting nozzle, observing and analyzing the microstructure of the continuous casting nozzle by means of a metallographic microscope, a scanning electron microscope and the like, and contrastively analyzing the morphology characteristics of the test flow and the contrast flow nozzle.
As shown in fig. 2, compared with the continuous casting nozzle treated by the static elimination method, the nozzle slag line part and the inner cavity part which are not treated are seriously eroded, the decarburized layer is thicker, a large amount of white flocculent alumina inclusions are adhered to the steel discharge opening, and the whole part of the continuous casting nozzle treated by the static elimination method is basically not seriously eroded.
Claims (3)
1. A method for suppressing the erosion of continuous casting nozzle by potential elimination method features that before the casting of molten steel, a metallic wire is connected to a stopper rod and the other end of said metallic wire is connected to the continuous casting nozzle.
2. The method for suppressing erosion of a continuous casting nozzle by potential elimination as set forth in claim 1, wherein said metal wire has a melting point of more than 1200 ℃ and is selected from the group consisting of iron, cobalt, nickel, and chromium.
3. The method as claimed in claim 1, wherein the outer wall of the continuous casting nozzle is grooved, then embedded with a metal wire, coated with high temperature refractory cement and molten glass, and then sealed, and finally coated with refractory wool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010187064.2A CN111230086A (en) | 2020-03-17 | 2020-03-17 | Method for inhibiting erosion of continuous casting nozzle by using potential elimination method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010187064.2A CN111230086A (en) | 2020-03-17 | 2020-03-17 | Method for inhibiting erosion of continuous casting nozzle by using potential elimination method |
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| CN111230086A true CN111230086A (en) | 2020-06-05 |
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| CN202010187064.2A Pending CN111230086A (en) | 2020-03-17 | 2020-03-17 | Method for inhibiting erosion of continuous casting nozzle by using potential elimination method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112658241A (en) * | 2020-12-10 | 2021-04-16 | 东北大学 | Method for preventing decarburization and reaction behavior of rare earth steel nozzle by applying interface electric field |
| CN113102744A (en) * | 2021-04-19 | 2021-07-13 | 辽宁科技大学 | Method for inhibiting erosion of continuous casting nozzle and operation steps |
| CN115770872A (en) * | 2022-06-24 | 2023-03-10 | 包头钢铁（集团）有限责任公司 | Method for preventing continuous casting immersion type water gap from being blocked |
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| JPH06182513A (en) * | 1992-12-21 | 1994-07-05 | Nippon Steel Corp | Method for blowing gas from immersion nozzle for continuous casting |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112658241A (en) * | 2020-12-10 | 2021-04-16 | 东北大学 | Method for preventing decarburization and reaction behavior of rare earth steel nozzle by applying interface electric field |
| CN113102744A (en) * | 2021-04-19 | 2021-07-13 | 辽宁科技大学 | Method for inhibiting erosion of continuous casting nozzle and operation steps |
| CN115770872A (en) * | 2022-06-24 | 2023-03-10 | 包头钢铁（集团）有限责任公司 | Method for preventing continuous casting immersion type water gap from being blocked |
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