CN111154947A - Gas protection method and device applied to pouring process of center pillar pipe - Google Patents
Gas protection method and device applied to pouring process of center pillar pipe Download PDFInfo
- Publication number
- CN111154947A CN111154947A CN201911414947.6A CN201911414947A CN111154947A CN 111154947 A CN111154947 A CN 111154947A CN 201911414947 A CN201911414947 A CN 201911414947A CN 111154947 A CN111154947 A CN 111154947A
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- Prior art keywords
- molten steel
- steel
- ladle
- steel ladle
- gas
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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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
- B22D41/507—Pouring-nozzles giving a rotating motion to the issuing molten metal
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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
- B22D41/58—Pouring-nozzles with gas injecting means
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Continuous Casting (AREA)
Abstract
The invention provides a gas protection method and a gas protection device applied to a pouring process of a middle column pipe, wherein the method comprises the following steps: step 1: when the molten steel does not flow into the steel ladle, namely, introducing inert gas into the steel ladle through a vent hole at the bottom of the steel ladle until the molten steel completely flows into the steel ladle, wherein the blowing direction of the inert gas is close to the horizontal tangential direction of the rotational flow of the molten steel, and the step 2: stopping introducing inert gas into the vent hole, and allowing the purified molten steel in the steel ladle to enter the molten steel tundish through the vent hole, wherein the step 3 is as follows: and opening a water gap at the bottom of the molten steel tundish to inject the molten steel in the molten steel tundish into the crystallizer for solidification and forming. Compared with the traditional pouring process of the center pillar pipe, the steel ladle is arranged at the outer side, molten steel realizes rotary flow through gas driving, collision and growth of inclusions are promoted, floating removal of the inclusions is facilitated, and removal efficiency of the inclusions is greatly improved.
Description
Technical Field
The invention belongs to the field of metallurgical technology and devices thereof, and particularly relates to a gas protection method and a gas protection device applied to a pouring process of a center pillar pipe.
Background
In the prior art, during steel making and pouring, because poured molten steel is directly contacted with air, secondary oxidation of the poured molten steel can be caused, so that the quality of steel making is reduced, and a novel argon protective cover for high-speed steel die steel making and pouring is generated later, so that the problem of quality reduction caused by secondary oxidation of the molten steel can be prevented to a certain extent, but the condition in a placing cavity of the novel argon protective cover cannot be observed, so that the use reliability of the novel argon protective cover is reduced; the height of the taking and placing port is limited, so that the taking and placing port cannot be further matched with an output port of a device for pouring molten steel, so that materials are often sprayed out of the shell during pouring, and the use reliability is influenced; and the position of the communicating pipe is fixed, and the communicating pipe cannot be rotated and adjusted, so that the whole shell needs to be moved when the communicating pipe is matched with an argon manufacturing or storage device, and the communicating pipe is very troublesome.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a gas protection method applied to a pouring process of a middle column tube, which comprises the following steps:
step 1: when the molten steel does not flow into the steel ladle, inert gas is introduced into the steel ladle through the vent hole at the bottom of the steel ladle until the molten steel completely flows into the steel ladle, the blowing direction of the inert gas faces to the horizontal tangential direction of the rotational flow of the molten steel to drive the molten steel to generate nearly horizontal rotational motion, the inclusion in the molten steel is migrated and gathered to the rotational central region by using the centrifugal force generated by the rotational motion of the molten steel, and then the inclusion is collided with each other, grown and floated on the surface of the molten steel so as to be adsorbed and removed by a slag layer, meanwhile, the gas dissolved in the molten steel is separated out from the interior of the molten steel and floated and removed, so that the impact kinetic energy generated by the mixed flow of the molten steel is converted into impact flow which is nearly horizontal tangential direction of the rotational flow of the molten steel, thereby driving the molten steel to generate nearly horizontal rotational, the area of the secondary oxidation of the molten steel is reduced,
step 2: stopping introducing the inert gas into the vent hole, introducing the purified molten steel in the steel ladle into the molten steel tundish through the vent hole,
and step 3: and opening a water gap at the bottom of the molten steel tundish to inject the molten steel in the molten steel tundish into the crystallizer for solidification and forming.
Further, the inert gas in the step 1 is argon, the flow rate of the introduced argon is 400-500L/min, and the introduction of the argon is started 1-2min ahead when the molten steel flows into the circular cavity of the central column tube.
The device applied to the gas protection method in the pouring process of any central column pipe comprises a steel ladle and a molten steel tundish, wherein a vent hole is formed between the steel ladle and the molten steel tundish, the vent hole is formed in the bottom of the steel ladle and the molten steel tundish, a long steel ladle water gap is formed in the center of the steel ladle, a plurality of inclined air blowing holes are uniformly formed in the side wall of the middle of the steel ladle along the circumference, the horizontal center line of each air blowing hole is higher than the outlet position of the long steel ladle water gap, a water gap is formed in the bottom of the molten steel tundish, and the water gap is controlled to be opened so that molten steel in the molten steel.
Furthermore, the horizontal section of the steel ladle is circular, the horizontal section of the molten steel tundish is square, the square on the bottom surface is larger than the square on the top surface, the area of the upper part is smaller, the whole molten steel tundish is in a gathering shape, the air contact surface is reduced, and the oxidation probability of the molten steel is further reduced.
Furthermore, the arrangement positions of the air blowing air holes on the side wall of the steel ladle are required to meet the requirements that the distance from the horizontal central line of the air blowing air holes to the bottom of the steel ladle is between 150mm and 200mm, the number of the air blowing air holes is 3-4, the aperture of the air blowing air holes is between 10mm and 15mm, and the air blowing direction of the air blowing air holes is arranged along the tangential direction of the molten steel rotational flow in the steel ladle, so that the impact kinetic energy generated by the mixed flow of the molten steel in the steel ladle is converted into the horizontal tangential impact flow close to the rotational flow of the molten steel, and the molten steel is driven to generate the nearly.
Further, the air vent and the air blowing hole are filled with air through an air conveying pipe, the ceramic fiber material is wrapped outside the air conveying pipe, and the air vent is made of hole-type air bricks.
Has the advantages that: compared with the traditional pouring process of the center pillar pipe, the steel ladle is arranged on the outer side, molten steel is driven by gas to realize rotary flow, collision and growth of inclusions are promoted, and floating removal of the inclusions is facilitated. Argon blown into the external ladle adheres to inclusions in molten steel to float and remove the inclusions, so that the removal efficiency of the inclusions is greatly improved. Simple structure, the operation is convenient, compares in utilizing rotating magnetic field drive molten steel to produce the energy consumption that rotary motion has saved last ten thousand watts of power, and the security is high, suitable popularization.
Drawings
FIG. 1 is a schematic structural view of the present invention,
figure 2 is a schematic side cross-sectional view of the present invention,
figure 3 is a schematic cross-sectional front view of the present invention,
reference numerals: 1-steel ladle, 2-molten steel tundish, 3-steel ladle long nozzle, 4-vent, 5-nozzle and 6-blowing air hole.
Detailed Description
The present invention is further illustrated by the following figures and specific examples, which are to be understood as illustrative only and not as limiting the scope of the invention, which is to be given the full breadth of the appended claims and any and all equivalent modifications thereof which may occur to those skilled in the art upon reading the present specification.
The invention relates to a gas protection method applied to a pouring process of a middle column pipe, which comprises the following steps:
step 1: when the molten steel does not flow into the steel ladle 1, inert gas is introduced into the steel ladle 1 through the air vent 4 at the bottom of the steel ladle 1 until the molten steel completely flows into the steel ladle 1, the blowing direction of the inert gas faces to the horizontal tangential direction of the rotational flow of the molten steel, the molten steel is driven to generate nearly horizontal rotational motion, the inclusion in the molten steel is migrated and gathered to the rotational central region by utilizing the centrifugal force generated by the rotational motion of the molten steel, the inclusion is further collided with each other, grown up and floated on the surface of the molten steel so as to be adsorbed and removed by a slag layer, meanwhile, the gas dissolved in the molten steel is separated out from the interior of the molten steel and is discharged in a floating manner, the impact kinetic energy generated by the mixed flow of the molten steel is converted into impact flow which is nearly horizontal tangential direction of the rotational flow of the molten steel, so as to drive the molten steel, the area of the secondary oxidation of the molten steel is reduced,
step 2: stopping introducing the inert gas into the vent hole 4, introducing the purified molten steel in the steel ladle 1 into the molten steel tundish 2 through the vent hole 4,
and step 3: and opening a water gap 5 at the bottom of the molten steel tundish 2 to inject the molten steel in the molten steel tundish 2 into the crystallizer for solidification and forming.
In the step 1, the inert gas is argon, the flow rate of the introduced argon is 400-plus 500L/min, and the introduction of the argon is started 1-2min ahead of time when the molten steel flows into the circular cavity of the central column pipe.
The device comprises a steel ladle 1 and a molten steel tundish 2, wherein a vent 4 is arranged between the steel ladle 1 and the molten steel tundish 2, the vent 4 is arranged at the bottom of the steel ladle 1 and the molten steel tundish 2, as shown in figure 2, a long ladle nozzle 3 is arranged at the center of the steel ladle 1, a plurality of inclined air blowing holes 6 are uniformly arranged on the side wall of the middle part of the steel ladle 1 along the circumference, the horizontal central line of each air blowing hole 6 is higher than the outlet position of the long ladle nozzle 3, a nozzle 5 is arranged at the bottom of the molten steel tundish 2, and as shown in figure 3, the molten steel in the molten steel tundish 2 is injected into a crystallizer by controlling to open the nozzle 5.
The horizontal section of the steel ladle 1 is round, the horizontal section of the molten steel tundish 2 is square, the square on the bottom surface is larger than the square on the top surface, the area of the upper part is smaller, the whole ladle is in a gathering shape, the air contact surface is reduced, and the oxidation probability of the molten steel is further reduced. The arrangement positions of the air blowing air holes 6 on the side wall of the steel ladle 1 are required to meet the requirements that the distance from the horizontal central line of the air blowing air holes 6 to the bottom of the steel ladle 1 is between 150mm and 200mm, the number of the air blowing air holes 6 is 3-4, the aperture of the air blowing air holes 6 is between 10mm and 15mm, and the air blowing direction of the air blowing air holes 6 is arranged along the tangential direction of the molten steel rotational flow in the steel ladle 1, so that the impact kinetic energy generated by the mixed flow of the molten steel in the steel ladle 1 is converted into the horizontal tangential impact flow close to the rotational flow of the molten steel, and the molten. The air vent 4 and the air blowing hole 6 are both filled with air through an air conveying pipe, the ceramic fiber material is wrapped outside the air conveying pipe, and the air vent 4 is made of porous air bricks.
Compared with the traditional pouring process of the center pillar pipe, the steel ladle is arranged on the outer side, molten steel is driven by gas to realize rotary flow, collision and growth of inclusions are promoted, and floating removal of the inclusions is facilitated. Argon blown into the external ladle adheres to inclusions in molten steel to float and remove the inclusions, so that the removal efficiency of the inclusions is greatly improved. The steel-making continuous casting production process by adopting the equipment, namely the method, is extremely simple and easy for industrialized production, can efficiently remove non-metallic inclusions and gas in molten steel at low equipment investment cost, is provided with the blowing system to enable the molten steel to flow in a rotating manner, saves the energy consumption of power of ten-thousand watts compared with the method that the molten steel in the circular cavity of the tundish is driven to rotate by a rotating magnetic field, can obviously enhance the efficiency of removing inclusions in the molten steel by driving the molten steel to flow in a rotating manner by inert gas, is particularly beneficial to removing tiny inclusions in the molten steel, can further remove gas in the molten steel at the same time, greatly reduces the impact force of the molten steel flowing into the ladle by the buoyancy of inert gas bubbles, avoids the corrosion caused by the impact of the molten steel at the bottom of the ladle, has the square horizontal section of the molten steel tundish, has the square bottom surface which is larger than, the whole body is in a gathering shape, the air contact surface is reduced, the molten steel oxidation probability is further reduced, the protective gas is introduced in advance, the rotational flow process is in the protective gas atmosphere, the probability that the poured molten steel is in direct contact with air is reduced, and the probability of secondary oxidation of the molten steel is reduced.
Claims (6)
1. The gas protection method applied to the pouring process of the center pillar pipe is characterized by comprising the following steps of:
step 1: firstly, introducing inert gas into the steel ladle (1) through a vent hole (4) at the side part of the steel ladle (1), then pouring molten steel towards the inside of the steel ladle (1) until the allowable injection amount of the steel ladle (1) is reached, wherein the blowing direction of the inert gas is tangential to the inner wall of the steel ladle,
step 2: stopping introducing the inert gas into the vent hole (4), transferring the molten steel in the steel ladle (1) to the tundish (2),
and step 3: and opening a water gap (5) at the bottom of the molten steel tundish (2) to enable the molten steel in the molten steel tundish (2) to be injected into the pouring pipe, then flowing to the ingot mold, and condensing and forming in the ingot mold.
2. The method as claimed in claim 1, wherein the inert gas is argon in step 1, the flow rate of the argon is 400-500L/min, and the argon is introduced 1-2min before the molten steel flows into the circular cavity of the center pillar.
3. The device applied to the gas protection method in the pouring process of the central column tube in any claim is characterized by comprising a steel ladle (1) and a molten steel tundish (2), wherein the vent holes (4) are formed in the bottom of the steel ladle (1), a steel ladle long nozzle (3) is arranged in the center of the steel ladle (1), a plurality of inclined air blowing holes (6) are uniformly formed in the side wall of the middle of the steel ladle (1) along the circumference, the horizontal center line of each air blowing hole (6) is higher than the outlet position of the steel ladle long nozzle (3), a nozzle (5) is formed in the bottom of the molten steel tundish (2), and molten steel in the molten steel tundish (2) is injected into a crystallizer by controlling and opening the nozzle (5).
4. The gas shield during the pouring process of the center pillar according to claim 3, wherein the horizontal section of the ladle (1) is circular, the horizontal section of the molten steel tundish (2) is square, and the square of the bottom surface is larger than the square of the top surface.
5. The gas protection device for the pouring process of the central column tube according to claim 3, wherein the arrangement position of the air blowing holes (6) on the side wall of the steel ladle (1) is such that the distance from the horizontal central line of the air blowing holes (6) to the bottom of the steel ladle (1) is 150mm-200mm, the number of the air blowing holes distributed along the circumference is 3-4, the aperture of the air blowing holes (6) is 10mm-15mm, and the air blowing direction of the air blowing holes (6) is arranged along the tangential direction of the molten steel rotational flow in the steel ladle (1), so that the impact kinetic energy generated by the mixed flow of the molten steel in the steel ladle (1) is converted into the impact flow close to the horizontal tangential direction of the rotational flow of the molten steel, thereby driving the molten steel to generate the nearly horizontal rotary motion.
6. The gas protection device for the pouring process of the center pillar according to claim 3, wherein the gas inlet (4) and the blowing gas hole (6) are both filled with gas through a gas pipe, the outside of the gas pipe is wrapped with ceramic fiber materials, and the gas inlet (4) is made of porous air bricks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911414947.6A CN111154947A (en) | 2019-12-31 | 2019-12-31 | Gas protection method and device applied to pouring process of center pillar pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911414947.6A CN111154947A (en) | 2019-12-31 | 2019-12-31 | Gas protection method and device applied to pouring process of center pillar pipe |
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| Publication Number | Publication Date |
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| CN111154947A true CN111154947A (en) | 2020-05-15 |
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| CN201911414947.6A Pending CN111154947A (en) | 2019-12-31 | 2019-12-31 | Gas protection method and device applied to pouring process of center pillar pipe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112517897A (en) * | 2020-11-19 | 2021-03-19 | 东北大学 | Split type tundish turbulence controller |
| CN114985685A (en) * | 2022-05-25 | 2022-09-02 | 唐山港陆钢铁有限公司 | Device and process for dispersing inclusion in molten steel of converter |
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2019
- 2019-12-31 CN CN201911414947.6A patent/CN111154947A/en active Pending
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112517897A (en) * | 2020-11-19 | 2021-03-19 | 东北大学 | Split type tundish turbulence controller |
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| CN114985685A (en) * | 2022-05-25 | 2022-09-02 | 唐山港陆钢铁有限公司 | Device and process for dispersing inclusion in molten steel of converter |
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