CN107225231B - Continuous casting tundish annular air curtain retaining wall and installation method thereof - Google Patents

Continuous casting tundish annular air curtain retaining wall and installation method thereof Download PDF

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CN107225231B
CN107225231B CN201710575311.4A CN201710575311A CN107225231B CN 107225231 B CN107225231 B CN 107225231B CN 201710575311 A CN201710575311 A CN 201710575311A CN 107225231 B CN107225231 B CN 107225231B
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retaining wall
air
curtain retaining
tundish
air curtain
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CN107225231A (en
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武光君
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Shandong Iron and Steel Co Ltd
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Shandong Iron and Steel Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/116—Refining the metal
    • B22D11/117—Refining the metal by treating with gases
    • 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
    • B22D41/02—Linings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

The invention relates to a continuous casting tundish annular air curtain retaining wall, which comprises an air curtain retaining wall body (1), a dispersed ventilating ring (2), an air chamber (3) and an air inlet pipe (4), wherein the air curtain retaining wall body is annular, a cylindrical mounting hole is arranged at the middle part of the gas curtain retaining wall, an annular diffused ventilating ring (2) is arranged in the gas curtain retaining wall body (1), the upper part of the diffused ventilating ring extends out of the upper surface of the gas curtain retaining wall body (1), a gas chamber (3) is formed at the bottom of the diffused ventilating ring, the side part of the gas chamber is connected with a gas inlet pipe (4), one end of the gas inlet pipe is communicated with the gas chamber, the other end of the gas inlet pipe extends out of the side part of the gas curtain retaining wall body, the gas inlet pipe is connected with a metal pipe fitting (8) and is communicated with an external argon gas source to blow in argon gas, an annular air curtain barrier is formed around the nozzle brick cup, so that molten steel entering the tundish nozzle is completely air-washed, and the impurity removal rate is improved.

Description

Continuous casting tundish annular air curtain retaining wall and installation method thereof
Technical Field
The invention relates to an annular gas curtain retaining wall of a continuous casting tundish and a molten steel gas washing method thereof, belonging to the technical field of metallurgy of ferrous metallurgy continuous casting tundish.
Background
A gas curtain retaining wall technology for continuous casting tundish is a new technology for removing non-metallic inclusion in molten steel developed at the end of 20 century, and its principle is that a strip-shaped gas curtain retaining wall perpendicular to the flow direction of molten steel is placed at a certain optimum position of the tundish bottom, argon is blown in, and the argon is passed through the gas curtain retaining wall and floated to form an argon bubble gas curtain barrier, so that it has the function of promoting floating and removing non-metallic inclusion in molten steel. However, the strip-shaped air curtain retaining wall has low impurity removal rate and short service life, and becomes a key technical problem restricting the popularization and application of the technology, and has the following defects or shortcomings: (1) a dead zone shaped like a right-angled triangle is formed between the upward vertical lines at the two ends of the strip-shaped gas curtain retaining wall and the ladle walls at the two sides of the tundish, and an argon bubble gas curtain barrier cannot be formed in the dead zone, namely, the argon bubble gas curtain barrier formed by argon blowing of the strip-shaped gas curtain retaining wall only performs gas washing on part of molten steel in the continuous casting tundish, so that the effect of removing impurities is reduced; (2) the dispersive magnesium gas curtain retaining wall produced by the prior art has high porosity, low strength, no erosion and scouring resistance, and low service life, can not be synchronous with the service life of tundish refractory, and has great influence on the production cost of continuous casting refractory; the dispersive air-permeable ring upper nozzle pocket brick produced by the prior art has defects or shortcomings: (1) the dispersive air ring is formed in the tundish upper nozzle pocket brick body and sleeved on the upper nozzle, so that the quality requirement is high, the risk is high, once the quality problem occurs, the normal pouring production is directly influenced, and even the unplanned pouring stop accident is caused; (2) the height of the dispersion ring is 90-115 mm, the height is large, not only is molding difficult and cost high, but also the air permeability of the dispersion ring is uneven, and the metallurgical effect of removing impurities is influenced.
Chinese patent document CN201070699Y (patent No. 200720151456.3) discloses an air curtain retaining wall, which has a wall made of air permeable material; the wall body is connected with an air compression supply source, and is characterized in that: the wall body is annular and is arranged around each water gap of the tundish respectively, and the wall body is connected with the compressed air supply source through connecting holes formed in the wall body. Which can economically solve the problem of complete air washing of the injected molten steel. The patent technology has the following defects: the wall body is not resistant to erosion and scouring, the service life is short, and the service life of the tundish is severely limited.
CN201070670Y (application No. 200720151457.8) discloses an air curtain retaining wall, which has a wall body (41) made of air permeable material; the wall body (41) is connected with an argon supply source; the wall body (41) has an open ring shape, and the wall body (41) is connected to the argon gas supply source through a connection hole (404) formed thereon. The air curtain retaining wall is respectively applied to a guiding and dividing pipe (30) extending from a slag blocking wall (20) of the tundish to two sides, and a plurality of dividing ports (32) are formed at intervals along the extending direction of the guiding and dividing pipe; the two ends (401, 402) of the wall (41) abut against the shunt tube side walls near the corresponding shunt opening (32) to form a closed annular region. The patent technology has the following defects: the wall is difficult to develop and produce, the cost is high, the process arrangement is complex, and the gas washing effect of the molten steel is poor.
Chinese patent document CN106041045A (patent number: 2016106342707) discloses a continuous casting tundish dispersive gas permeable ring upper nozzle pocket brick and an argon blowing refining method thereof, which comprises an upper nozzle pocket brick body (1), a dispersive gas permeable ring (2), a gas chamber (3) and a gas inlet pipe (4), wherein the upper nozzle pocket brick body is internally provided with the dispersive gas permeable ring (2) and the annular gas chamber (3) which are uniformly arranged in a circular shape, the gas chamber is positioned at the bottom of the dispersive gas permeable ring and communicated with the gas permeable dispersive gas permeable ring, the upper part of the dispersive gas permeable ring extends out of the upper surface of the nozzle pocket brick body (1) by 5-10 mm, the side part of the gas chamber is connected with the gas inlet pipe (4), one end of the gas inlet pipe is communicated with the gas chamber, the other end of the gas inlet pipe extends out of the side part of the upper nozzle pocket brick body (1), a metal pipe fitting is connected with an external argon gas source, after argon is blown in, a circular gas curtain barrier is formed upwards to perform gas washing on molten steel entering the upper nozzle, the floating and removal of impurities are promoted, a certain amount of argon bubbles enter an immersion nozzle along with steel flow to form stable and continuous annular airflow, the nozzle nodulation problem is inhibited, and the problem of casting blank subcutaneous bubbles caused by protective argon bubbles entering steel is solved. The patent technology has the following defects: the upper nozzle pocket brick of the ventilation ring is single and heavy, the air chamber structure is complex, the height of the diffused ventilation ring is large, the forming is difficult, the production cost is high, the ventilation of the ventilation ring is uneven, and the argon blowing metallurgical effect is influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a continuous casting tundish annular air curtain retaining wall and a molten steel air washing method thereof, the annular air curtain retaining wall and the tundish upper nozzle pocket brick are designed in a split way, the annular air curtain retaining wall is sleeved on each upper nozzle pocket brick of the continuous casting tundish, argon is blown in to generate argon bubbles, an annular air curtain barrier is formed around the upper nozzle pocket brick, the molten steel entering the tundish water feeding port is completely gas-washed, so that the argon bubbles drive impurities to float to the liquid level of the tundish and be absorbed and effectively removed by a high-alkalinity tundish covering agent in time, the impurity removal rate is improved, the quantity of the impurities in the rolled material is reduced by more than 50 percent compared with the quantity of the impurities in the prior patent CN201070699Y (patent number: 200720151456.3), meanwhile, the annular air curtain retaining wall body and the breathable ring are produced by adopting a secondary forming process, are resistant to corrosion and scouring, and have long service life reaching 22-24 hours.
The utility model provides a package annular air curtain barricade in middle of continuous casting, including air curtain barricade body (1), diffuse formula ventilative ring (2), air chamber (3), intake pipe (4), the transversal ring shape of personally submitting of air curtain barricade body (1), the middle part of air curtain barricade body (1) is provided with the mounting hole, be provided with diffuse formula ventilative ring (2) in air curtain barricade body (1), the upper surface of air curtain barricade body (1) is stretched out on the upper portion of diffuse formula ventilative ring, air chamber (3) shaping is in the bottom of diffuse formula ventilative ring, the lateral part of air chamber (3) is connected with intake pipe (4), the one end and the air chamber intercommunication of intake pipe, the other end stretches out from the lateral part of air curtain body (1), a serial communication, air chamber (3) one shot forming when producing diffuse formula ventilative ring, the production technology is simplified, and production cost is reduced.
Preferably, the air inlet pipe is communicated with an external argon gas source through a metal pipe fitting (8). The middle part of the air curtain retaining wall body (1) is provided with a cylindrical mounting hole.
Preferably, the air curtain retaining wall body (1) is cast and molded by corundum castable, and the volume density is more than or equal to 3.0g/cm 3 High-temperature rupture strength of 12MPa or more, high-temperature compressive strength of 80MPa or more, AL 2 O 3 The content is more than or equal to 92 percent, and Cr 2 O 3 The content is more than or equal to 2.0 percent.
Preferably, the dispersive gas-permeable ring (2) is formed by taking high-purity corundum, mullite and the like as main raw materials in a machine pressing mode 2 O 3 The content is more than or equal to 83 percent, and SiO is 2 Less than or equal to 6.0 percent of Cr 2 O 3 The content is less than or equal to 2.0 percent, and the volume density is more than or equal to 2.65g/cm 3 The high-temperature compressive strength is not less than 50Mpa, and the apparent porosity is 25-28%.
Preferably, the cross section of the dispersive air-permeable ring (2) is circular, the longitudinal section of the dispersive air-permeable ring is in a right trapezoid shape, the width b of the upper part of the circular ring is 35-45 mm, the width c of the lower part of the circular ring is 40-50 mm, and the height h of the dispersive air-permeable ring is 50-80 mm.
Preferably, the height x of the upper end of the dispersive air-permeable ring (2) extending out of the upper surface of the air curtain retaining wall body (1) is 5-10 mm.
Preferably, the air chamber (3) is annular as a whole, the longitudinal section of the air chamber is semicircular, the radius R of the air chamber is 9-10 mm, the air chamber (3) is provided with an air inlet pipe mounting hole (5), and the diameter d of the air inlet pipe mounting hole is 12-13 mm. Preferably, the diameter d of the intake pipe mounting hole is 12 mm.
Preferably, the elevation L of the air inlet pipe (4) is 20-40 mm.
The air inlet pipe (4) and the metal pipe fitting (8) are both made of heat-resistant stainless steel round pipes, wherein the specification size of the air inlet pipe (4) is M11 multiplied by 1.25 (the internal thread of a nut is 11mm in major diameter, and the thread pitch is 1.25mm), and the specification size of the metal pipe fitting (8) is phi 10 multiplied by 2 (the external diameter is 10mm, and the wall thickness is 2 mm).
The invention relates to a continuous casting tundish annular air curtain retaining wall and a tundish upper nozzle pocket block which are designed in a split manner, wherein the cross section of a dispersion type ventilation ring (2) is in a ring shape, the longitudinal section of the dispersion type ventilation ring is in a right trapezoid shape, the width b of the upper part of the ring is 35-45 mm, the width c of the lower part of the ring is 40-50 mm, the height h of the dispersion type ventilation ring is 50-80 mm, and the dispersion type ventilation ring is obtained by a large number of water model experimental researches and production application experimental verifications by technicians in the field, and the design has direct influence on the production cost, ventilation uniformity and molten steel purifying effect of the dispersion type ventilation ring and the problem of avoiding the generation of casting blank subcutaneous bubbles when argon bubbles enter a crystallizer. The problem of casting blank subcutaneous bubbles caused by protective argon bubbles entering steel is essentially solved; the height h of the dispersive air-permeable ring (2) is 50-80 mm, and is reduced compared with the height of 90-115 mm of an air-permeable ring of CN106041045A (patent number: 2016106342707), so that the forming quality is improved, the technical problem of uneven air permeability is solved, and the production cost is reduced.
The invention also provides an installation method of the continuous casting tundish annular air curtain retaining wall, which comprises the following steps:
1) arranging a metal pipe fitting embedding groove (12) on the tundish bottom permanent lining (11), wherein the depth y of the groove is 50-70 mm, the width is 30-40 mm, and the groove is used for laying the metal pipe fitting (8);
2) installing and fixing a tundish water feeding port (7);
3) installing and fixing an upper nozzle pocket brick (6),
4) a layer of magnesium ramming mass is padded around the upper nozzle pocket brick (6), the thickness z is 60-80 mm, corundum fire clay with the thickness of 10-15 mm is smeared on the outer wall of the upper nozzle pocket brick (6), the inner cavity of the annular air curtain retaining wall body (1) is sleeved on the upper nozzle pocket brick (6), so that the upper surface of the annular air curtain retaining wall body (1) is flush with the upper surface of the upper nozzle pocket brick (6), and the air inlet pipe (4) is arranged in a metal pipe embedding groove (12) permanently lined with a ladle bottom;
5) butting an air inlet pipe (4) with a metal pipe (8) in a metal pipe embedding groove (12) on a permanent lining of a ladle bottom, leading the metal pipe (8) to be tightly attached to corner lines at the end part and the side part of the permanent lining of the tundish, leading out from the ladle edge, and welding and fixing the metal pipe on a pressing plate (9) of the tundish edge;
6) tamping is filled in an upper nozzle brick cup mounting pit (14) and a metal pipe embedding groove (12) on a permanent lining of a ladle bottom by adopting a magnesium ramming mass;
7) the construction of the tundish working lining (10) according to the prior art, the embedding of the metal pipe fitting on the permanent lining of the ladle wall in the groove (12) and the filling and leveling of the ladle edge in the cutting opening of the pressing plate (9) by adopting magnesium coating materials, so far, the installation of the continuous casting tundish annular air curtain retaining wall is finished, and the tundish working lining can be used on line after the construction and baking according to the prior art.
The magnesium ramming mass and the magnesium coating mass are both conventional refractory materials and are commercially available products.
The invention relates to a method for air-washing tundish steel liquid by utilizing a continuous casting tundish annular air curtain retaining wall, which comprises the following steps:
1) before the continuous casting tundish is baked, the metal pipe fitting (8) is connected with an external argon gas source;
2) when a continuous casting ladle is started to be poured, argon is blown into the annular gas curtain retaining wall, the initial argon flow is 10-15 NL/min, when molten steel in a tundish reaches a tundish liquid level (15) for normal pouring, the argon flow is adjusted to 16-20 NL/min, and the argon flow is controlled to be proper to slightly fluctuate the tundish liquid level (15) in the area right above the annular gas curtain retaining wall body (1);
3) and after the continuous casting ladle stops casting, the annular gas curtain retaining wall stops blowing argon.
NL/min refers to the flow rate at 20 degrees Celsius at 1 atmosphere standard condition, liters per minute.
The invention has the beneficial effects that:
1) the annular gas curtain retaining wall of the continuous casting tundish and the tundish upper nozzle pocket brick adopt a split design, the distance between the dispersive air brick and the upper nozzle steel flow hole is larger, argon bubbles generated by the dispersive air permeable ring cannot enter the upper nozzle along with steel flow, and the problem of casting blank subcutaneous bubbles caused by protective argon bubbles entering steel is essentially solved.
2) The height h of the diffused air-permeable ring of the annular air curtain retaining wall is 50-80 mm, and is higher than that of CN106041045A (patent number: 2016106342707), not only improves the molding quality, solves the technical problem of uneven ventilation, but also reduces the production cost.
3) The air chamber of the annular air curtain retaining wall is formed in one step when the dispersive air-permeable ring is produced, so that the production process is simplified, and the production cost is reduced.
4) The annular air curtain retaining wall body is cast and molded by adopting corundum castable, is molded by a diffuse type air-permeable ring machine in a pressing mode, is fired at high temperature, resists corrosion and scouring, has long service life reaching 22-24 hours, and is longer than the service life of the annular air curtain retaining wall body prepared by applying the prior patent CN201070699Y (patent number: 200720151456.3) is improved by more than 1 time.
5) Argon is blown into the continuous casting tundish annular air curtain retaining wall to generate argon bubbles, an annular air curtain barrier is formed around the upper nozzle pocket brick, all molten steel entering the upper nozzle of the tundish is subjected to air washing, the impurity removal rate is improved, and the quantity of metallic inclusions in rolled materials is the same as that of the molten steel blown into the tundish upper nozzle by applying the prior patent CN201070699Y (patent number: 200720151456.3) by more than 50%.
The invention is characterized in that firstly, the continuous casting tundish annular air curtain retaining wall and the tundish upper nozzle pocket block adopt split design, the distance between a dispersion type air brick and an upper nozzle steel flowing hole is larger, argon bubbles generated by the dispersion type air permeable ring cannot enter the upper nozzle along with steel flow, and the problem of casting blank subcutaneous bubbles caused by protective argon bubbles entering steel is essentially solved; secondly, the height h of the diffused air permeable ring (2) is 50-80 mm, and is reduced compared with the height of an air permeable ring of CN106041045A (patent number: 2016106342707) of 90-115 mm, so that the forming quality is improved, the technical problem of uneven air permeability is solved, and the production cost is reduced; thirdly, the air chamber (3) is formed in one step when the dispersive type air permeable ring is produced, so that the production process is simplified, and the production cost is reduced.
Drawings
FIG. 1 is a schematic sectional view of a continuous casting tundish annular air curtain retaining wall according to an embodiment of the present invention.
FIG. 2 is a schematic top view of an annular gas curtain retaining wall structure of a continuous casting tundish according to an embodiment of the invention.
FIG. 3 is a schematic view of a structure of a diffusive air ring in an embodiment of the present invention.
FIG. 4 is a schematic view of the installation of the annular air curtain retaining wall of the continuous casting tundish according to the embodiment of the invention.
In the figure, 1, an annular air curtain retaining wall body; 2. a diffusive gas permeable ring; 3. an air chamber; 4. an air inlet pipe; 5. an air inlet pipe mounting hole; 6. a water feeding port brick cup; 7. a tundish water feeding port; 8. a metal pipe fitting; 9. wrapping the edge and pressing the plate; 10. a tundish working lining; 11. a permanent lining of the tundish; 12. burying a groove in the metal pipe fitting; 13. wrapping the tundish; 14. a water feeding nozzle brick cup is arranged in the pit; 15. the liquid level of the tundish.
Detailed Description
The invention is further illustrated by the following examples and drawings, but is not limited thereto. The present invention, not described in detail, may be implemented by using the existing techniques.
Example 1:
a continuous casting tundish annular air curtain retaining wall is shown in figures 1, 2, 3 and 4 and comprises an air curtain retaining wall body 1, a dispersion type ventilation ring 2, an air chamber 3 and an air inlet pipe 4, wherein the air curtain retaining wall body 1 is circular, a cylindrical mounting hole is formed in the middle of the air curtain retaining wall body 1, the annular dispersion type ventilation ring 2 is arranged in the air curtain retaining wall body 1, the upper part of the dispersion type ventilation ring extends out of the upper surface of the air curtain retaining wall body 1, the air chamber 3 is formed at the bottom of the dispersion type ventilation ring, the air inlet pipe 4 is connected to the side part of the air chamber 3, one end of the air inlet pipe is communicated with the air chamber, the other end of the air inlet pipe extends out of the side part of the air curtain retaining wall body 1, and the air inlet pipe is connected with a metal pipe fitting 8 and communicated with an external argon gas source.
The air curtain retaining wall body 1 is cast and molded by adopting corundum castable, and the volume density is more than or equal to 3.0g/cm 3 High-temperature rupture strength of 12MPa or more, high-temperature compressive strength of 80MPa or more, AL 2 O 3 The content is more than or equal to 92 percent, and Cr 2 O 3 The content is more than or equal to 2.0 percent.
The dispersive air-permeable ring 2 is formed by adopting high-purity corundum, mullite and the like as main raw materials in a machine pressing mode, and AL 2 O 3 The content is more than or equal to 83 percent, and SiO is 2 Less than or equal to 6.0 percent of Cr 2 O 3 The content is less than or equal to 2.0 percent, and the volume density is more than or equal to 2.65g/cm 3 The high-temperature compressive strength is not less than 50Mpa, and the apparent porosity is 25-28%.
The cross section of the dispersive air-permeable ring 2 is circular, the longitudinal section of the dispersive air-permeable ring is in a right trapezoid shape, the width b of the upper part of the circular ring is 45mm, the width c of the lower part of the circular ring is 50mm, and the height h of the dispersive air-permeable ring is 80 mm.
The upper end of the dispersive air-permeable ring 2 extends out of the height x of the upper surface of the air curtain retaining wall body 1 is 5 mm.
The whole air chamber 3 is circular, the longitudinal section of the air chamber is semicircular, the radius R of the air chamber is 9mm, the air chamber 3 is provided with an air inlet pipe mounting hole 5, and the diameter d of the air inlet pipe mounting hole is 12 mm.
The elevation L of the air inlet pipe 4 is 40 mm.
The air inlet pipe (4) and the metal pipe fitting (8) are both made of heat-resistant stainless steel round pipes, wherein the air inlet pipe (4) is M11 multiplied by 1.25 in specification and size (the inner threads of the nut are 11mm in major diameter and 1.25mm in thread pitch), and the metal pipe fitting (8) is phi 10 multiplied by 2 in specification and size (the outer diameter is 10mm and the wall thickness is 2 mm).
The installation method of the continuous casting tundish annular air curtain retaining wall comprises the following steps:
1) arranging a metal pipe fitting embedding groove 12 on a tundish bottom permanent liner 11, wherein the depth y of the groove is 70mm, the width of the groove is 40mm, and the groove is used for laying a metal pipe fitting 8;
2) installing and fixing a tundish upper nozzle 7 according to the prior art;
3) installing and fixing the upper nozzle pocket brick 6 according to the prior art,
4) a layer of magnesium ramming mass is padded around the upper nozzle pocket brick 6, the thickness z is 60mm, corundum fire clay with the thickness of 15mm is smeared on the outer wall of the upper nozzle pocket brick 6, the inner cavity of the annular air curtain retaining wall body 1 is sleeved on the upper nozzle pocket brick 6, so that the upper surface of the annular air curtain retaining wall body 1 is flush with the upper surface of the upper nozzle pocket brick 6, and the air inlet pipe 4 is arranged in a metal pipe fitting embedding groove 12 on a ladle bottom permanent lining;
5) butting the air inlet pipe 4 with the metal pipe 8 in a metal pipe embedding groove 12 on the permanent lining of the ladle bottom, leading the metal pipe 8 to be tightly attached to the corner line of the end part and the side part of the permanent lining of the tundish, leading out from the ladle edge, and welding and fixing the metal pipe on a pressing plate 9 of the tundish edge;
6) tamping the mixture in the upper nozzle brick cup mounting pit 14 and the metal pipe embedding groove 12 on the permanent lining of the ladle bottom by adopting a magnesium ramming mass;
7) the construction of the working lining 10 of the tundish according to the prior art, the embedding of the metal pipe fitting on the permanent lining of the ladle wall in the groove 12 and the filling and leveling of the cutting opening of the ladle edge pressing plate 9 by adopting magnesium coating materials, so far, the installation of the annular gas curtain retaining wall of the continuous casting tundish is finished, and the annular gas curtain retaining wall of the continuous casting tundish can be used on line after the construction and baking of the working lining of the tundish according to the prior art.
The magnesium ramming mass and the magnesium coating mass are both conventional refractory materials and are commercially available products.
The method for gas washing of the tundish molten steel by utilizing the continuous casting tundish annular gas curtain retaining wall comprises the following steps:
1) before the continuous casting tundish is baked, the metal pipe fitting 8 is connected with an external argon gas source;
2) when a continuous casting ladle is started to cast, argon is blown into the annular gas curtain retaining wall, the initial argon flow is 10NL/min, when molten steel in the tundish reaches the tundish liquid level 15 for normal casting, the argon flow is increased to 16NL/min, and the argon flow is controlled to be suitable for slight fluctuation of the tundish liquid level 15 in the area right above the annular gas curtain retaining wall body 1;
3) and after the continuous casting ladle stops casting, the annular gas curtain retaining wall stops blowing argon.
Examples 2,
The continuous casting tundish annular air curtain wall according to embodiment 1 is different in that:
the cross section of the dispersive air-permeable ring 2 is circular, the longitudinal section of the dispersive air-permeable ring is in a right trapezoid shape, the width b of the upper part of the circular ring is 35mm, the width c of the lower part of the circular ring is 40mm, and the height h of the dispersive air-permeable ring is 50 mm.
The upper end of the dispersive air-permeable ring 2 extends out of the height x of the upper surface of the air curtain retaining wall body 1 and is 10 mm.
The air chamber 3 is integrally annular, the longitudinal section of the air chamber is semicircular, and the radius R of the air chamber is 10 mm. An air inlet pipe mounting hole 5 is formed in the air chamber 3, and the diameter d of the air inlet pipe mounting hole is 13 mm.
The elevation L of the air inlet pipe 4 is 20 mm.
The installation method of the continuous casting tundish annular air curtain retaining wall comprises the following steps:
1) arranging a metal pipe fitting embedding groove 12 on a tundish bottom permanent liner 11, wherein the depth y of the groove is 50mm, the width of the groove is 30mm, and the groove is used for laying a metal pipe fitting 8;
2) installing and fixing a tundish upper nozzle 7 according to the prior art;
3) installing and fixing the upper nozzle pocket brick 6 according to the prior art,
4) a layer of magnesium ramming mass is padded around the upper nozzle pocket brick 6, the thickness z is 80mm, corundum fire clay with the thickness of 12mm is smeared on the outer wall of the upper nozzle pocket brick 6, the inner cavity of the annular air curtain retaining wall body 1 is sleeved on the upper nozzle pocket brick 6, so that the upper surface of the annular air curtain retaining wall body 1 is flush with the upper surface of the upper nozzle pocket brick 6, and the air inlet pipe 4 is arranged in a metal pipe fitting embedding groove 12 on a ladle bottom permanent lining;
5) butting the air inlet pipe 4 with the metal pipe 8 in the metal pipe embedding groove 12 on the permanent lining of the ladle bottom, leading the metal pipe 8 to be tightly attached to the corner line of the end part and the side part of the permanent lining of the tundish, leading out from the ladle edge, and welding and fixing the metal pipe on the pressing plate 9 of the tundish edge;
6) tamping the mixture in the upper nozzle brick cup mounting pit 14 and the metal pipe embedding groove 12 on the permanent lining of the ladle bottom by adopting a magnesium ramming mass;
7) the construction of the working lining 10 of the tundish according to the prior art, the embedding of the metal pipe fitting on the permanent lining of the ladle wall in the groove 12 and the filling and leveling of the cutting opening of the ladle edge pressing plate 9 by adopting magnesium coating materials, so far, the installation of the annular gas curtain retaining wall of the continuous casting tundish is finished, and the annular gas curtain retaining wall of the continuous casting tundish can be used on line after the construction and the baking of the working lining of the tundish according to the prior art.
A method for gas washing tundish molten steel by utilizing an annular gas curtain retaining wall of a continuous casting tundish comprises the following steps:
1) before the continuous casting tundish is baked, the metal pipe fitting 8 is connected with an external argon gas source;
2) when a continuous casting ladle is started to cast, argon is blown into the annular gas curtain retaining wall, the initial argon flow is 15NL/min, when molten steel in the tundish reaches the tundish liquid level 15 in normal casting, the argon flow is adjusted to be 20NL/min, and the argon flow is controlled to be suitable for slight fluctuation of the tundish liquid level 15 in the area right above the annular gas curtain retaining wall body 1;
3) and after the continuous casting ladle stops casting, the annular gas curtain retaining wall stops blowing argon.
Examples 3,
The cross section of the dispersive air-permeable ring 2 is circular, the longitudinal section of the dispersive air-permeable ring is in a right trapezoid shape, the width b of the upper part of the circular ring is 40mm, the width c of the lower part of the circular ring is 45mm, and the height h of the dispersive air-permeable ring is 70 mm.
The upper end of the dispersive air-permeable ring 2 extends out of the height x of the upper surface of the air curtain retaining wall body 1 and is 7 mm.
The air chamber 3 is integrally annular, the longitudinal section of the air chamber is semicircular, and the radius R of the air chamber is 9.5 mm. An air inlet pipe mounting hole 5 is formed in the air chamber 3, and the diameter d of the air inlet pipe mounting hole is 12 mm.
The elevation L of the air inlet pipe 4 is 30 mm.
The method for gas washing of the tundish molten steel by utilizing the continuous casting tundish annular gas curtain retaining wall comprises the following steps:
1) before the continuous casting tundish is baked, connecting the metal pipe fitting with an external argon gas source;
2) when a continuous casting ladle is started to cast, argon is blown into the annular gas curtain retaining wall, the initial argon flow is 12NL/min, when molten steel in the tundish reaches the tundish liquid level 15 in normal casting, the argon flow is increased by 18NL/min, and the argon flow is controlled to be suitable for slight fluctuation of the tundish liquid level 15 in the area right above the annular gas curtain retaining wall body 1;
3) and after the continuous casting ladle stops casting, the annular gas curtain retaining wall stops blowing argon.
Comparative example 1: chinese patent document CN201070699Y (patent No. 200720151456.3) discloses a gas curtain retaining wall, wherein the flow of argon gas is 6L/min.
The high-strength steel Q550D was cast in a No. 4 slab caster of Laiwu Steel group Yinshan type Steel Co., Ltd. according to examples 1 to 3 and comparative example 1, and metallographic inclusions were measured and analyzed by taking a metallographic specimen of a rolled material having a size of 20X 15 mm. The annular gas curtain retaining wall of the tundish is corrosion-resistant and erosion-resistant, the service life of the annular gas curtain retaining wall can be kept synchronous with a water feeding port, a stopper rod and an immersion type water gap of the tundish, the service life of the annular gas curtain retaining wall can reach 22-24 hours, the ratio of the annular gas curtain retaining wall to the immersion type water gap is improved by more than 1 time compared with the ratio 1, and the quantity of metallic phase inclusions in a rolled material is reduced by more than 50% compared with the ratio 1. The comparative results are shown in Table 1.
TABLE 1
Figure GDA0003734093650000081

Claims (7)

1. The continuous casting tundish annular air curtain retaining wall comprises an air curtain retaining wall body (1), a diffused air permeable ring (2), an air chamber (3) and an air inlet pipe (4), and is characterized in that the continuous casting tundish annular air curtain retaining wall and a water feeding nozzle brick cup are designed in a split mode, the cross section of the air curtain retaining wall body (1) is annular, a mounting hole is formed in the middle of the air curtain retaining wall body (1), the diffused air permeable ring (2) is arranged in the air curtain retaining wall body (1), the upper portion of the diffused air permeable ring extends out of the upper surface of the air curtain retaining wall body (1), the air chamber (3) is formed at the bottom of the diffused air permeable ring, the air inlet pipe (4) is connected to the side portion of the air chamber (3), one end of the air inlet pipe is communicated with the air chamber, the other end of the air inlet pipe extends out of the side portion of the air curtain retaining wall body (1), and the air chamber (3) is formed at one step when the diffused air permeable ring is produced; the inner cavity of the annular air curtain retaining wall body (1) is sleeved on the upper nozzle pocket block (6);
the air curtain retaining wall body (1) is cast and molded by corundum castable, and the volume density is more than or equal to 3.0g/cm 3 High-temperature rupture strength of 12MPa or more, high-temperature compressive strength of 80MPa or more, AL 2 O 3 The content is more than or equal to 92 percent, and Cr 2 O 3 The content is more than or equal to 2.0 percent;
the dispersive air-permeable ring (2) is formed by adopting high-purity corundum and mullite as main raw materials in a machine pressing mode and AL 2 O 3 The content is more than or equal to 83 percent, and SiO is 2 Less than or equal to 6.0 percent of Cr 2 O 3 The content is less than or equal to 2.0 percent, and the volume density is more than or equal to 2.65g/cm 3 The high-temperature compressive strength is more than or equal to 50Mpa, and the apparent porosity is 25-28%;
the cross section of the dispersive air-permeable ring (2) is circular, the longitudinal section of the dispersive air-permeable ring is in a right trapezoid shape, the width b of the upper part of the circular ring is 35-45 mm, the width c of the lower part of the circular ring is 40-50 mm, and the height h of the dispersive air-permeable ring is 50-80 mm.
2. The annular gas curtain retaining wall for a continuous casting tundish according to claim 1, wherein the gas inlet pipe is connected to an external argon gas source through a metal pipe (8).
3. The continuous casting tundish annular air curtain retaining wall according to claim 1, wherein the air curtain retaining wall body (1) is provided at its central portion with a cylindrical mounting hole.
4. The continuous casting tundish annular air curtain wall according to any one of claims 1 to 3, wherein the upper end of the diffused air permeable ring (2) extends out of the upper surface of the air curtain wall body (1) by a height x of 5 to 10 mm.
5. The continuous casting tundish annular air curtain retaining wall according to any one of claims 1 to 3, wherein the air chamber (3) is annular as a whole, the longitudinal section of the air chamber is semicircular, the radius R of the air chamber is 9-10 mm, an air inlet pipe mounting hole (5) is formed in the air chamber (3), and the diameter d of the mounting hole is 12-13 mm.
6. The continuous casting tundish annular air curtain retaining wall according to any one of claims 1 to 3, wherein the level L of the air inlet pipe (4) is 20 to 40 mm.
7. A method of installing the annular air curtain retaining wall of the continuous casting tundish according to claim 1, comprising the steps of:
1) arranging a metal pipe fitting embedding groove (12) on the tundish bottom permanent lining (11), wherein the depth y of the groove is 50-70 mm, the width is 30-40 mm, and the groove is used for laying the metal pipe fitting (8);
2) installing and fixing a tundish water feeding port (7);
3) installing and fixing an upper nozzle pocket brick (6),
4) a layer of magnesium ramming mass is padded around the upper nozzle pocket brick (6), the thickness z is 60-80 mm, corundum fire clay with the thickness of 10-15 mm is smeared on the outer wall of the upper nozzle pocket brick (6), the inner cavity of the annular air curtain retaining wall body (1) is sleeved on the upper nozzle pocket brick (6), so that the upper surface of the annular air curtain retaining wall body (1) is flush with the upper surface of the upper nozzle pocket brick (6), and the air inlet pipe (4) is arranged in a metal pipe embedding groove (12) permanently lined with a ladle bottom;
5) butting an air inlet pipe (4) with a metal pipe fitting (8) in a metal pipe fitting embedding groove (12) on a permanent lining of a ladle bottom, leading the metal pipe fitting (8) to be tightly attached to corner lines at the end part and the side part of the permanent lining of the tundish, leading out from the ladle edge, and welding and fixing the metal pipe fitting on a pressing plate (9) of the tundish edge;
6) tamping is filled in an upper nozzle brick cup mounting pit (14) and a metal pipe embedding groove (12) on a permanent lining of a ladle bottom by adopting a magnesium ramming mass;
7) according to the prior art, a tundish working lining (10) is constructed, a metal pipe fitting is embedded in a groove (12) on a permanent lining of a ladle wall, and a cutting opening of a ladle edge pressing plate (9) is filled and leveled by adopting magnesium coating materials, so that the annular air curtain retaining wall of the continuous casting tundish is installed, and the tundish working lining can be used on line after being constructed and baked according to the prior art.
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