CN103990787B - A kind of for removing the device and method of molten steel inclusion in continuous casting production - Google Patents
A kind of for removing the device and method of molten steel inclusion in continuous casting production Download PDFInfo
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Abstract
nullThe present invention relates to a kind of for removing the device and method of molten steel inclusion in continuous casting production，Including turbulence inhibitor、Air curtain air brick、Barricade and dam，Air curtain air brick (2) is positioned between turbulence inhibitor (1) and barricade (3)，It is fixed in permanent liner at the bottom of middle handbag，The longitudinal centre line of described turbulence inhibitor (1) and air curtain air brick (2) horizontal range a are 400～600mm，The horizontal range b of air curtain air brick (2) and barricade (3) is 200～700mm，The horizontal range c of barricade (3) and dam (4) is 200～700mm，The application present invention，The equivalent diameter field trash more than 50 μm in continuous casting billet is removed substantially，In continuous casting billet, the equivalent diameter microscopic inclusions quantity less than 50 μm is arranged by turbulence inhibitor than in tundish、Barricade、More than 60% is reduced on year-on-year basis when dam combination use，Arrange by turbulence inhibitor than in tundish、More than 30% is reduced on year-on-year basis when the use of air curtain air brick.
Description
Technical field
The present invention relates to a kind of for removing the device and method of molten steel inclusion in continuous casting production, belong to Ferrous Metallurgy continuous casting production Technology field.
Background technology
The flow control device used by turbulence inhibitor, barricade, dam combination is set in continuous casting tundish, the running route of molten steel in tundish can be changed, extend the molten steel time of staying in tundish, promote inclusion floating and removal, reduce strand inner inclusion, change the metallurgical function of inclusion morphology.In recent years, for meeting the control requirement to field trash of the Development and Production high-purity clean steel, research application continuous casting production air curtain barricade wall technology, it is placed at the bottom of middle handbag by air curtain air brick, being blown into argon, argon floats and forms one microbubble air curtain barrier through air curtain barricade wall, and field trash is flutterred and caught, floats by these microbubbles, thus being adsorbed by slag blanket, reach the purpose of removal of inclusions cleaning molten steel.
As, Chinese patent literature CN201603865U (application number: 201020116865.1) discloses a kind of T-shaped tundish being provided with flow control device.A kind of T-shaped tundish adopting " two wall two dams " formula flow control device, including inclusion, long nozzle, first, second, 3rd, 4th outlet and flow control device, flow control device includes two barricades and two dam, barricade is arranged symmetrically with and lays respectively at long nozzle both sides second, in inclusion cavity between 3rd outlet, barricade peripheral part connects with inclusion cavity inner wall, barricade middle and lower part has barricade pod apertures, two dam are arranged symmetrically with and lay respectively at first and second outlet, in inclusion cavity between 3rd and the 4th outlet, dam bottom surface and two sides connect with inclusion cavity inner wall.Adopt " two wall two dams " formula flow control device in T-shaped tundish of the present utility model, improve the nowed forming of molten steel in tundish, extend molten steel and arrive the time of outlet, promote inclusion floating separation, uniform molten steel composition and temperature.
Chinese patent literature CN101121199 (application number: 200710121680.2) discloses a kind of method that continuous casting production air curtain barricade wall removes non-metallic inclusion, tundish permanent layer is placed air brick, couple argon blowing pipeline, after building working lining by laying bricks or stones, requiring breathes freely above air brick shows out size 0MM at the bottom of tundish～40MM, from tundish argon bottom-blowing, inclusion particle collision is conducive to grow up and get rid of；The bubble floated can catch inclusion particle, and carry it and together float, microscopic inclusions granule ascent rate is thus made to increase to the speed of bubble floating, all can replace original weir and dam in tundish (dam) with part, being corroded, by barricade (dam), the field trash bringing molten steel into thus reducing, being effectively improved molten steel degree of purity.
In actual production process, prove through long-term production practices, existing flow control device and the two kinds of plans of establishment of continuous casting production air curtain barricade wall technology all have technological deficiency: arrange the flow control device scheme used by turbulence inhibitor, barricade, dam combination in (1) continuous casting tundish, the equivalent diameter field trash more than 50 μm can only be effectively removed, and the equivalent diameter microscopic inclusions less than 50 μm can not be effectively removed；The technical scheme of air curtain air brick is set in continuous casting tundish, can only effectively remove the equivalent diameter microscopic inclusions less than 50 μm, and can not effectively remove the equivalent diameter field trash more than 50 μm；(2) installation position of existing air curtain air brick is equipped with technological deficiency: existing air curtain air brick substitutes dam or the pouring area being arranged between dam and tundish upper nozzle, and the practical application effect effectively removing the equivalent diameter microscopic inclusions less than 50 μm is poor；(3) in order to remove the effect of field trash in molten steel, require that the small and dense intensity of bubble diameter that air curtain air brick produces is high, but the slit-type air curtain air brick that prior art produces, its pore is bigger, general equivalent diameter is more than 50 μm, and (through hydraulic model trial mensuration, bubble equivalent diameter is more than 1.5mm), quantity is few relatively greatly for the bubble equivalent diameter of generation, the bubble closeness forming air curtain barricade wall is little, and thus the practical application effect of removal of inclusions is undesirable.
A kind of device for controlling flow of ladle of Chinese patent literature CN202779663U (application number: 201220454113.5), include tundish, turbulence inhibitor, top retaining wall, lower retaining wall it is arranged with respectively successively in the turbulence inhibitor left and right sides, described tundish is opened type structure, its cross section is inverted trapezoidal, described lower retaining wall is inverted ladder-shaped body structure, and the vertical height of the lower surface of described top retaining wall is less than the vertical height of lower retaining wall upper surface；It is provided with tapping hole in the outside of lower retaining wall, the tundish bottom wall of inner cavity between tapping hole and lower retaining wall is provided with the ventilative wall that a row is built by laying bricks or stones by air brick.Device for controlling flow of ladle of the present utility model utilizes bottom to be provided with novel turbulence inhibitor, the molten steel of beam forms two approach, not only effectively extend its time of staying in tundish, be conducive to the removal of field trash, and make the flowing of molten steel more mild in order.But this patent suffers from the drawback that, although top retaining wall, lower retaining wall can remove a part of equivalent diameter field trash more than 50 μm, removal effect is undesirable, and the pore of air curtain air brick is bigger, the Argon Bubble produced is relatively large in diameter and rare, whole causes that the equivalent diameter field trash more than 50 μm and the equivalent diameter inclusion removal less than 50 μm are undesirable.
Summary of the invention
For the deficiencies in the prior art, the present invention provides a kind of for removing the device and method of molten steel inclusion in continuous casting production, the present invention is the position of preferred arrangement flow control device and air curtain air brick in tundish, application effect significantly improves, use assembly of the invention that the equivalent diameter field trash more than 50 μm in continuous casting billet is removed substantially, in continuous casting billet, the equivalent diameter microscopic inclusions quantity less than 50 μm arranges merely turbulence inhibitor than using in tundish, barricade, in the continuous casting billet that the device of dam is produced, field trash reduces more than 60% on year-on-year basis, ratio arranges merely turbulence inhibitor in tundish, in the continuous casting billet that the device that air curtain is ventilative is produced, field trash reduces more than 30%.
Technical scheme is as follows:
nullA kind of for removing the device of molten steel inclusion in continuous casting production，Including turbulence inhibitor (1)、Air curtain air brick (2)、Barricade (3) and dam (4)，Turbulence inhibitor is arranged on the inner side of tundish beam impact zone containment wall working lining，Its longitudinal centre line overlaps with the centrage of big bag long nozzle，The two side ends of barricade is fixed on tundish containment wall working lining，The bottom of dam is fixed on tundish and is underwrited lining work，Described barricade is between turbulence inhibitor and dam，It is characterized in that，Air curtain air brick (2) is positioned between turbulence inhibitor (1) and barricade (3)，And bottom is fixed in permanent liner at the bottom of middle handbag，The horizontal range a of the longitudinal centre line of described turbulence inhibitor (1) and air curtain air brick (2) is 400～600mm，The horizontal range b of air curtain air brick (2) and barricade (3) is 200～700mm，The horizontal range c of barricade (3) and dam (4) is 200～700mm，The horizontal range d of dam and tundish upper nozzle is 800～1200mm，Described barricade and the upper and lower interlaced arrangement of dam，The top of the bottom lower than barricade, the top of described air curtain air brick or dam.
The present invention it is preferred that, the horizontal range of the longitudinal centre line of described turbulence inhibitor (1) and air curtain air brick (2) is 550～600mm, the horizontal range b of air curtain air brick (2) and barricade (3) is 600～700mm, and the horizontal range c of barricade (3) and dam (4) is 600～700mm.
nullThe air curtain air brick (2) of the present invention is positioned between turbulence inhibitor (1) and barricade (3)，It is fixed in permanent liner at the bottom of middle handbag，The horizontal range a of the longitudinal centre line of described turbulence inhibitor (1) and air curtain air brick (2) is 400～600mm，The horizontal range b of air curtain air brick (2) and barricade (3) is 200～700mm，The horizontal range c of barricade (3) and dam (4) is 200～700mm，It is based on the task of the present invention: can effectively remove the equivalent diameter field trash more than 50 μm，Can effectively remove again the equivalent diameter microscopic inclusions less than 50 μm，The equivalent diameter field trash more than 50 μm in continuous casting billet is made substantially to remove，Improve the removal ability of molten steel inclusion in tundish and regioselective，It is that those skilled in the art gropes to obtain through long-term experiment，Due to the fact that the effect of turbulence inhibitor，Enter the molten steel in tundish and flow to change、Flow velocity reduces，Molten steel flows through above the air curtain air brick between turbulence inhibitor (1) and barricade (3)，The blowout of air curtain air brick is close Argon Bubble continuously，Form bar shaped air curtain barrier，Bar shaped air curtain barrier reduce further the flow velocity of molten steel，Extend the time of staying of molten steel in tundish，Improve molten steel flow behavior，Now in molten steel, the equivalent diameter microscopic inclusions less than 50 μm is relatively active，Intensive Argon Bubble is caught microscopic inclusions and is floated and the part equivalent diameter inclusion floating more than 50 μm，Thus being adsorbed by slag blanket，Molten steel is through barricade，By the baffling of barricade、Reduction of speed，Arrive dam，A part of molten steel climbs over dam and forms the stream stock flowed up，Another part molten steel flows up to surface in dam and sidewall intersection along sidewall，Make the equivalent diameter inclusion removal more than 50 μm further，Air curtain air brick and barricade、The cooperation of dam makes the equivalent diameter field trash more than 50 μm substantially all remove.
The distance of the position of the air curtain air brick of the present invention and air curtain air brick distance turbulence inhibitor, the position of distance barricade, it is that those skilled in the art gropes to obtain through long-term experiment so that in molten steel, the equivalent diameter microscopic inclusions quantity less than 50 μm arranges merely molten steel inclusion in the device of turbulence inhibitor, barricade, dam and reduces more than 60% on year-on-year basis than in continuous casting production.
Currently preferred, described air curtain air brick includes air brick matrix and air brick core body, it is provided with air chamber in air brick matrix, one end of air chamber is connected to air inlet pipe, air inlet pipe connects with in air chamber, air inlet pipe is stretched out the part of air brick matrix and is connected to jointing, air brick matrix is provided with air brick core body embedded groove above air chamber, described air brick core body embeds in the embedded groove of air brick matrix, described air brick matrix adopts castable vibration moulding, and air brick core body adopts the magnesia molding of diffusion-type.The air curtain air brick of the present invention has the advantages such as bubble closeness is big that diffusion-type mechanical pressing air brick produces, and has again the advantage that moulding by casting air brick production cost is low.
Currently preferred, in the middle of the bottom embedment of described air curtain air brick (2), at the bottom of handbag, the degree of depth m of permanent liner (6) is 15～30mm, it is preferred that, 18～20mm.In the middle of the bottom embedment of air curtain air brick (2), at the bottom of handbag, the degree of depth of permanent liner (6) ensures that air curtain air brick blowing argon gas is continuous, intensive, uniform on the one hand, on the other hand in order to the air inlet pipe of air curtain air brick is easy to connect.
According to currently preferred, described barricade and the upper and lower staggered heights n of dam are 100～150mm, and the thickness L of barricade is 100～160mm, and the thickness X of dam is 120～200mm.
According to currently preferred, the most high liquid level (HLL) (8) of the molten steel that the upper edge of barricade is normally poured into a mould higher than tundish, but lower than middle handbag edge.
nullAccording to currently preferred，The turbulence inhibitor of the present invention adopts combined material-structure，Turbulence inhibitor is by turbulence inhibitor shell (15)、Turbulence inhibitor set core (16)、Turbulence inhibitor base plate (17) assembles，Work surface is smeared antioxidation coating coating (18)，Turbulence inhibitor set core is positioned on the medial wall of turbulence inhibitor shell inner cavity，Turbulence inhibitor base plate is positioned at the bottom of turbulence inhibitor shell inner cavity，Described turbulence inhibitor shell adopts castable moulding by casting，Described turbulence inhibitor set core is the upper end diameter truncated cone more than lower end diameter，Central hollow is that upper end diameter is less than in the truncated cone of lower end diameter，Described turbulence inhibitor set core is that in adopting after castable moulding by casting, temperature firing process is prepared from，Described turbulence inhibitor base plate adopts magnesia carbon brick to build molding by laying bricks or stones.
During the barricade (3) of the present invention, dam (4) adopt after being castable moulding by casting, temperature firing process is prepared from.
The present invention also provides for a kind of device for removing molten steel inclusion in continuous casting production and removes the method for molten steel inclusion in tundish, comprises the following steps:
1), in liner in dundish baking process, the omnidistance Argon of air curtain air brick (2), argon pressure controls at 0.15～0.2MPa, and flow-control is at 10～20NL/min, to prevent tunger tube road high-temperature oxydation, deformation；
2) pre-Argon in tundish, unwrap greatly water before 20～30s, by air curtain air brick (2) to seal tundish in blowing argon gas, pass into argon displacement tundish in air, argon pressure controls at 0.15～0.2MPa, and flow-control is at 20～30NL/min；
3) unwrapping greatly the Argon before watering to tundish molten steel face arrival normal level of liquid, the argon pressure of air curtain air brick (2) controls at 0.15～0.2MPa, and flow-control is at 20～30NL/min；
4) the normal Argon pouring into a mould molten steel face in tundish, the argon pressure of air curtain air brick (2) controls at 0.2～0.3MPa, flow-control at 30～50NL/min,
Tests prove that, this pressure, flow can control that molten steel face in tundish is micro-to be had fluctuation and can not blow the top of the slag open.
5) Argon in low molten steel face in tundish, when cast liquid level is lower than normal level of liquid in the tundish such as big bag replacing, turns argon down, and the argon pressure of air curtain air brick (2) controls at 0.15～0.2MPa, and flow-control is at 20～30NL/min；
6), after tundish stops watering, air curtain air brick (2) Argon is stopped.
Beneficial effects of the present invention:
null(1) air curtain air brick (2) is positioned between turbulence inhibitor (1) and barricade (3) by the present invention，And the horizontal range a of the longitudinal centre line of turbulence inhibitor (1) and air curtain air brick (2) is 400～600mm，The horizontal range b of air curtain air brick (2) and barricade (3) is 200～700mm，On slab CC tundish after application，Achieve unforeseeable technique effect: in the continuous casting billet that application assembly of the invention is produced, the equivalent diameter field trash more than 50 μm is removed substantially，In continuous casting billet, the equivalent diameter microscopic inclusions quantity less than 50 μm arranges merely turbulence inhibitor than using in tundish、Barricade、In the continuous casting billet that the device of dam is produced, field trash reduces more than 60% on year-on-year basis，Ratio arranges merely turbulence inhibitor in tundish、In the continuous casting billet that the device that air curtain is ventilative is produced, field trash reduces more than 30%.
(2) damascene structures that air curtain air brick (2) of the present invention is post forming, both there is the advantages such as bubble closeness is big that diffusion-type mechanical pressing air brick produces, there is again the advantage that moulding by casting air brick production cost is low, reduce production cost more than 40% on year-on-year basis than mechanical pressing air brick.
Accompanying drawing explanation
Fig. 1 is that the present invention is for removing the device overall structure schematic diagram of molten steel inclusion in continuous casting production.
Fig. 2 is air curtain air brick structural representation in the embodiment of the present invention, and wherein, A is the front view of air curtain air brick, and B is the side view of air curtain air brick.
Fig. 3 is the structural representation of turbulence inhibitor in the embodiment of the present invention.
Fig. 4 is the structural representation of barricade in the embodiment of the present invention, and wherein, A is the front view of barricade, and B is the side view of barricade.
Fig. 5 is the structural representation of dam in the embodiment of the present invention, and wherein, A is the front view of dam, and B is the side view of dam.
In figure, 1. turbulence inhibitor；2. air curtain air brick；3. barricade；4. dam；5. liner in dundish；6. tundish permanent liner；7. tundish upper nozzle；8. the most high liquid level (HLL) of the molten steel that tundish is normally poured into a mould；9. big bag long nozzle；10. air brick matrix；11. air brick core body；12. air chamber；13. air inlet pipe；14. jointing；15. turbulence inhibitor shell；16. turbulence inhibitor set core；17. turbulence inhibitor base plate；18. coating, 19, the longitudinal centre line of turbulence inhibitor.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described, but is not limited to this.
Embodiment 1
nullA kind of for removing the device of molten steel inclusion in continuous casting production，Structure is as Figure 1-Figure 5，Including turbulence inhibitor 1、Air curtain air brick 2、Barricade 3 and dam 4，Turbulence inhibitor 1 is arranged on the inner side of tundish beam impact zone containment wall working lining，Its longitudinal centre line overlaps with the centrage of big bag long nozzle 9，The two side ends of barricade 3 is fixed on tundish containment wall working lining 5，The bottom of dam is fixed on tundish and is underwrited lining work on 5，Described barricade 3 is between turbulence inhibitor 1 and dam 4，Air curtain air brick 2 is between turbulence inhibitor 1 and barricade 3，And bottom is fixed in permanent liner at the bottom of middle handbag，The longitudinal centre line of described turbulence inhibitor 1 and the horizontal range a of air curtain air brick 2 are 550mm，The horizontal range b of air curtain air brick 2 and barricade 3 is 600mm，The horizontal range c of barricade 3 and dam 4 is 700mm，The horizontal range d of dam and tundish upper nozzle is 900mm，Described barricade and the upper and lower interlaced arrangement of dam，The top of the bottom lower than barricade, the top of described air curtain air brick or dam.
Described air curtain air brick 2 includes air brick matrix 10 and air brick core body 11, air chamber 12 it is provided with in air brick matrix 10, one end of air chamber 12 is connected to air inlet pipe 13, air inlet pipe 13 connects with in air chamber 12, air inlet pipe 13 is stretched out the part of air brick matrix 10 and is connected to jointing 14, air brick matrix 10 is provided with air brick core body embedded groove above air chamber 12, described air brick core body 11 embeds in the embedded groove of air brick matrix, described air brick matrix adopts castable vibration moulding, and air brick core body adopts the magnesia molding of diffusion-type.In the middle of the bottom embedment of air curtain air brick 2, at the bottom of handbag, the degree of depth m of permanent liner 6 is 15mm.
Barricade 3 and the upper and lower staggered heights n of dam are 120mm, and the thickness L of barricade is 100mm, and the thickness X of dam is 120mm.The most high liquid level (HLL) 8 of the molten steel that the upper edge of barricade 3 is normally poured into a mould higher than tundish, but lower than middle handbag edge.
The turbulence inhibitor of the present invention adopts combined material-structure, turbulence inhibitor is by turbulence inhibitor shell 15, turbulence inhibitor set core 16, turbulence inhibitor base plate 17 assembles, work surface is smeared antioxidation coating coating 18, turbulence inhibitor set core is positioned on the medial wall of turbulence inhibitor shell inner cavity, turbulence inhibitor base plate is positioned at the bottom of turbulence inhibitor shell inner cavity, described turbulence inhibitor shell adopts castable moulding by casting, described turbulence inhibitor set core is the upper end diameter truncated cone more than lower end diameter, central hollow is that upper end diameter is less than in the truncated cone of lower end diameter, described turbulence inhibitor set core is that in adopting after castable moulding by casting, temperature firing process is prepared from, described turbulence inhibitor base plate adopts magnesia carbon brick to build molding by laying bricks or stones.
During barricade 3, dam 4 adopt after being castable moulding by casting, temperature firing process is prepared from.
Embodiment 2,
As described in Example 1 for removing the device of molten steel inclusion in continuous casting production, it is different in that:
The longitudinal centre line of described turbulence inhibitor 1 and the horizontal range a of air curtain air brick 2 are 600mm, the horizontal range b of air curtain air brick 2 and barricade 3 is 700mm, the horizontal range c of barricade 3 and dam 4 is 600mm, and the horizontal range d of dam and tundish upper nozzle is 1000mm.
In the middle of the bottom embedment of described air curtain air brick 2, at the bottom of handbag, the degree of depth m of permanent liner 6 is 30mm.
Embodiment 3,
As described in Example 1 for removing the device of molten steel inclusion in continuous casting production, it is different in that:
The centrage of described turbulence inhibitor 1 and the horizontal range a of air curtain air brick 2 are 400mm, the horizontal range b of air curtain air brick 2 and barricade 3 is 200mm, the horizontal range c of barricade 3 and dam 4 is 200mm, and the horizontal range d of dam and tundish upper nozzle is 1200mm.
In the middle of the bottom embedment of described air curtain air brick 2, at the bottom of handbag, the degree of depth m of permanent liner 6 is 18mm.
Embodiment 4,
The device for removing molten steel inclusion in continuous casting production described in a kind of embodiment 1 removes the method for molten steel inclusion in tundish, comprises the following steps:
1), in liner in dundish baking process, the omnidistance Argon of air curtain air brick 2, argon pressure controls at 0.15MPa, and flow-control is at 10NL/min, to prevent tunger tube road high-temperature oxydation, deformation；
2) pre-Argon in tundish, unwrap greatly water before 20s, by air curtain air brick 2 to blowing argon gas in the tundish sealed, pass into air in argon displacement tundish, argon pressure controls at 0.15MPa, and flow-control is at 20NL/min；
3) unwrapping greatly the Argon before watering to tundish molten steel face arrival normal level of liquid, the argon pressure of air curtain air brick 2 controls at 0.15MPa, and flow-control is at 20NL/min；
4) the normal Argon pouring into a mould molten steel face in tundish, the argon pressure of air curtain air brick (2) controls at 0.2MPa, flow-control at 30NL/min,
5) Argon in low molten steel face in tundish, when cast liquid level is lower than normal level of liquid in the tundish such as big bag replacing, turns argon down, and the argon pressure of air curtain air brick (2) controls at 0.15MPa, and flow-control is at 20NL/min；
6), after tundish stops watering, air curtain air brick (2) Argon is stopped.
Embodiment 5,
The device for removing molten steel inclusion in continuous casting production described in a kind of embodiment 1 removes the method for molten steel inclusion in tundish, comprises the following steps:
1), in liner in dundish baking process, the omnidistance Argon of air curtain air brick 2, argon pressure controls at 0.2MPa, and flow-control is at 20NL/min, to prevent tunger tube road high-temperature oxydation, deformation；
2) pre-Argon in tundish, unwrap greatly water before 30s, by air curtain air brick 2 to blowing argon gas in the tundish sealed, pass into air in argon displacement tundish, argon pressure controls at 0.2MPa, and flow-control is at 30NL/min；
3) unwrapping greatly the Argon before watering to tundish molten steel face arrival normal level of liquid, the argon pressure of air curtain air brick 2 controls at 0.2MPa, and flow-control is at 30NL/min；
4) the normal Argon pouring into a mould molten steel face in tundish, the argon pressure of air curtain air brick 2 controls at 0.3MPa, flow-control at 50NL/min,
5) Argon in low molten steel face in tundish, when cast liquid level is lower than normal level of liquid in the tundish such as big bag replacing, turns argon down, and the argon pressure of air curtain air brick (2) controls at 0.2MPa, and flow-control is at 30NL/min；
6), after tundish stops watering, air curtain air brick (2) Argon is stopped.
Comparative example 1
A kind of for removing the device of molten steel inclusion in continuous casting production, including turbulence inhibitor, barricade, dam, turbulence inhibitor is arranged on the inner side of tundish beam impact zone containment wall working lining, its centrage overlaps with the centrage of big bag long nozzle, the two side ends of barricade is fixed on tundish containment wall working lining, the bottom of dam is fixed on tundish and is underwrited lining work, the most high liquid level (HLL) of the molten steel that the upper edge of barricade is normally poured into a mould higher than tundish, but lower than the work surface of tundish overfall coating, barricade and the upper and lower interlaced arrangement of dam；Longitudinal center's linear distance of barricade and turbulence inhibitor is 550mm, and the horizontal range of dam and barricade is 600mm, and the horizontal range of dam and tundish upper nozzle is 1200mm.
Comparative example 2
A kind of for removing the device of molten steel inclusion in continuous casting production, including turbulence inhibitor and air curtain air brick, turbulence inhibitor is arranged on the inner side of tundish beam impact zone containment wall working lining, its longitudinal centre line overlaps with the centrage of big bag long nozzle 9, air curtain air brick is between turbulence inhibitor and tundish upper nozzle, bottom is fixed in permanent liner 6 at the bottom of middle handbag, and the horizontal range between longitudinal centre line and the air curtain air brick 2 of described turbulence inhibitor 1 is 550mm.
Air curtain air brick includes air brick matrix and air brick core body, it is provided with air chamber in air brick matrix, one end of air chamber is connected to air inlet pipe, air inlet pipe connects with in air chamber, air inlet pipe is stretched out the part of air brick matrix and is connected to jointing, is provided with air brick core body embedded groove above air chamber on air brick matrix, and described air brick core body embeds in the embedded groove of air brick matrix, described air brick matrix adopts castable vibration moulding, and air brick core body adopts the magnesia molding of diffusion-type.In the middle of the bottom embedment of air curtain air brick, at the bottom of handbag, the degree of depth m of permanent liner is 15mm.
Comparative example 3
nullA kind of for removing the device of molten steel inclusion in continuous casting production，Including turbulence inhibitor 1、Air curtain air brick 2、Barricade 3 and dam 4，Turbulence inhibitor 1 is arranged on the inner side of tundish beam impact zone containment wall working lining，Its longitudinal centre line overlaps with the centrage of big bag long nozzle 9，Barricade 3 is fixed on tundish containment wall working lining 5，Dam is between barricade 3 and tundish upper nozzle 7，And be fixed on tundish and underwrite lining work on 5，Barricade 3 and dam about 4 are crisscross arranged，Air curtain air brick 2 is between dam and tundish upper nozzle，It is fixed in permanent liner 6 at the bottom of middle handbag，Horizontal range a between longitudinal centre line and the barricade of described turbulence inhibitor 1 is 400mm，The horizontal range b of barricade and dam is 600mm，The horizontal range of dam and air curtain air brick is 700mm，Air curtain air brick and and tundish upper nozzle between central horizontal distance be 900mm.
Experimental example
By the device of molten steel inclusion in the removal continuous casting production of embodiment 1～3 and comparative example 1～3, Comparison study analysis on Laiwu steel enterprise Yin Shan shaped steel company limited steel mill single current wide slab continuous caster tundish, steel grade AH36, take casting blank sample respectively, specimen size is that length and width is 30mm, adopting Electronic Speculum detection to analyze, in visual field, electrolysis the amount of inclusions is as shown in table 1
Electrolysis the amount of inclusions (unit: individual) in table 1 visual field
Data Comparison by table 1, application assembly of the invention, in visual field, in the continuous casting billet that embodiment of the present invention 1-3 produces equivalent diameter more than 50 μm and equivalent diameter be in the electrolysis the amount of inclusions of 40～50 μm and be zero, and there is also the minority equivalent diameter electrolysis field trash more than 50 μm in the continuous casting billet that comparative example 1-3 produces, and equivalent diameter is in the electrolysis the amount of inclusions of 40～50 μm and is slightly more than the embodiment of the present invention 1-3 continuous casting billet produced；In the continuous casting billet that comparative example 1-3 produces, the equivalent diameter electrolysis the amount of inclusions less than 40 μm is significantly more than electrolysis the amount of inclusions in the embodiment of the present invention 1-3 continuous casting billet produced, therefore assembly of the invention is applied, the equivalent diameter field trash more than 50 μm in continuous casting billet is removed substantially, in continuous casting billet, the equivalent diameter microscopic inclusions quantity less than 50 μm arranges merely turbulence inhibitor than using in tundish, barricade, in the continuous casting billet that the device of dam is produced, field trash reduces 62.5% on year-on-year basis, ratio arranges merely turbulence inhibitor in tundish, in the continuous casting billet that the device that air curtain is ventilative is produced, field trash reduces 33.3%, than air curtain air brick be arranged between dam and tundish upper nozzle the continuous casting billet produced of device in field trash reduce 40% on year-on-year basis.
Claims (8)
1. for removing a device for molten steel inclusion in continuous casting production, including turbulence inhibitor (1), air curtain air brick
null(2)、Barricade (3) and dam (4)，Turbulence inhibitor is arranged on the inner side of tundish beam impact zone containment wall working lining，Its longitudinal centre line overlaps with the centrage of big bag long nozzle，The two side ends of barricade is fixed on tundish containment wall working lining，The bottom of dam is fixed on tundish and is underwrited lining work，Described barricade is between turbulence inhibitor and dam，It is characterized in that，Air curtain air brick (2) is positioned between turbulence inhibitor (1) and barricade (3)，And bottom is fixed in permanent liner at the bottom of middle handbag，The horizontal range a of the longitudinal centre line of described turbulence inhibitor (1) and air curtain air brick (2) is 400～600mm，The horizontal range b of air curtain air brick (2) and barricade (3) is 200～700mm，The horizontal range c of barricade (3) and dam (4) is 200～700mm，The horizontal range d of dam and tundish upper nozzle is 800～1200mm，Described barricade and the upper and lower interlaced arrangement of dam，The top of the bottom lower than barricade, the top of described air curtain air brick or dam；Described air curtain air brick includes air brick matrix and air brick core body, it is provided with air chamber in air brick matrix, one end of air chamber is connected to air inlet pipe, air inlet pipe connects with in air chamber, air inlet pipe is stretched out the part of air brick matrix and is connected to jointing, air brick matrix is provided with air brick core body embedded groove above air chamber, described air brick core body embeds in the embedded groove of air brick matrix, described air brick matrix adopts castable vibration moulding, and air brick core body adopts the magnesia molding of diffusion-type.
2. according to claim 1 for removing the device of molten steel inclusion in continuous casting production, it is characterized in that, the horizontal range of the longitudinal centre line of described turbulence inhibitor (1) and air curtain air brick (2) is 550～600mm, the horizontal range b of air curtain air brick (2) and barricade (3) is 600～700mm, and the horizontal range c of barricade (3) and dam (4) is 600～700mm.
3. according to claim 1 for removing the device of molten steel inclusion in continuous casting production, it is characterised in that in the middle of the bottom embedment of described air curtain air brick (2), at the bottom of handbag, the degree of depth m of permanent liner (6) is 15～30mm.
4. according to claim 3 for removing the device of molten steel inclusion in continuous casting production, it is characterised in that in the middle of the bottom embedment of described air curtain air brick (2), at the bottom of handbag, the degree of depth m of permanent liner (6) is 18～20mm.
5. according to claim 1 for removing the device of molten steel inclusion in continuous casting production, it is characterised in that described barricade and the upper and lower staggered heights n of dam are 100～150mm, and the thickness L of barricade is 100～160mm, and the thickness X of dam is 120～200mm.
6. according to claim 1 for removing the device of molten steel inclusion in continuous casting production, it is characterised in that the most high liquid level (HLL) (8) of the molten steel that the upper edge of barricade is normally poured into a mould higher than tundish, but lower than middle handbag edge.
null7. according to claim 1 for removing the device of molten steel inclusion in continuous casting production，It is characterized in that，Turbulence inhibitor adopts combined material-structure，Turbulence inhibitor is by turbulence inhibitor shell (15)、Turbulence inhibitor set core (16)、Turbulence inhibitor base plate (17) assembles，Work surface is smeared antioxidation coating coating (18)，Turbulence inhibitor set core is positioned on the medial wall of turbulence inhibitor shell inner cavity，Turbulence inhibitor base plate is positioned at the bottom of turbulence inhibitor shell inner cavity，Described turbulence inhibitor shell adopts castable moulding by casting，Described turbulence inhibitor set core is the upper end diameter truncated cone more than lower end diameter，Central hollow is the upper end diameter truncated cone less than lower end diameter，Described turbulence inhibitor set core is that in adopting after castable moulding by casting, temperature firing process is prepared from，Described turbulence inhibitor base plate adopts magnesia carbon brick to build molding by laying bricks or stones；During barricade (3), dam (4) adopt after being castable moulding by casting, temperature firing process is prepared from.
8. the device for removing molten steel inclusion in continuous casting production described in claim 1 removes a method for molten steel inclusion in tundish, comprises the following steps:
1), in liner in dundish baking process, the omnidistance Argon of air curtain air brick (2), argon pressure controls at 0.15～0.2MPa, and flow-control is at 10～20NL/min, to prevent tunger tube road high-temperature oxydation, deformation；
2) pre-Argon in tundish, unwrap greatly water before 20 ~ 30s, by air curtain air brick (2) to blowing argon gas in the tundish sealed, pass into air in argon displacement tundish, argon pressure controls at 0.15～0.2MPa, and flow-control is at 20～30NL/min；
3) unwrapping greatly the Argon before watering to tundish molten steel face arrival normal level of liquid, the argon pressure of air curtain air brick (2) controls at 0.15～0.2MPa, and flow-control is at 20～30NL/min；
4) the normal Argon pouring into a mould molten steel face in tundish, the argon pressure of air curtain air brick (2) controls at 0.2～0.3MPa, flow-control at 30～50NL/min,
5) Argon in low molten steel face in tundish, when cast liquid level is lower than normal level of liquid in the tundish such as big bag replacing, turns argon down
Gas, the argon pressure of air curtain air brick (2) controls at 0.15～0.2MPa, and flow-control is at 20～30NL/min；
6), after tundish stops watering, air curtain air brick (2) Argon is stopped.
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| CN106041042B (en) * | 2016-08-18 | 2018-11-30 | 四川西南不锈钢有限责任公司 | Special-shaped stainless steel continuous casting tundish |
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| CN106513608B (en) * | 2016-12-12 | 2018-11-06 | 山东钢铁股份有限公司 | One kind being used for slab CC tundish bar shaped air brick covering ar blowing refining device and argon gas control method |
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| CN107838388B (en) * | 2017-12-25 | 2023-07-14 | 山东钢铁股份有限公司 | Argon blowing metallurgical device for continuous casting tundish and argon control method |
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| CN114734031B (en) * | 2022-04-11 | 2023-12-15 | 成都先进金属材料产业技术研究院股份有限公司 | Pouring launder of vacuum induction furnace and pouring method of vacuum induction smelting |
| CN115198055B (en) * | 2022-06-16 | 2023-06-09 | 莱芜钢铁集团银山型钢有限公司 | Continuous casting tundish turbulence controller with argon blowing function and preparation method thereof |
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