CN103990787A - Device and method for removing molten steel slag inclusion in continuous casting tundish - Google Patents
Device and method for removing molten steel slag inclusion in continuous casting tundish Download PDFInfo
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- CN103990787A CN103990787A CN201410209515.2A CN201410209515A CN103990787A CN 103990787 A CN103990787 A CN 103990787A CN 201410209515 A CN201410209515 A CN 201410209515A CN 103990787 A CN103990787 A CN 103990787A
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Abstract
The invention relates to a device and method for removing molten steel slag inclusion in a continuous casting tundish. The device comprises a turbulence controller, air curtain ventilation bricks, parapets and blocking dams, wherein the air curtain ventilation bricks (2) are located between the turbulence controller (1) and the parapet (3) and fixed to a tundish bottom permanent liner, the horizontal distance a between the longitudinal center line of the turbulence controller (1) and the longitudinal center line of the air curtain ventilation bricks (2) ranges from 400 mm to 600 mm, the horizontal distance b between the air curtain ventilation bricks (2) and the parapets (3) ranges from 200 mm to 700 mm, and the horizontal distance c between the parapets (3) and the blocking dams (4) ranges from 200 mm to 700 mm. By means of the method and device, the slag inclusion with the equivalent diameter larger than 50 microns in a continuous casting slab is basically removed, and the amount of micro slag inclusion with the equivalent diameter smaller than 50 microns in the continuous casting slab is reduced by more than 60 percent compared with the amount of the micro slag inclusion removed under the using condition that one tundish is internally provided with the turbulence controller, the parapets and the blocking dams and is reduced by more than 30 percent compared with the amount of the micro slag inclusion removed under the using condition that one tundish is internally provided with the turbulence controller and the air curtain ventilation bricks.
Description
Technical field
The present invention relates to a kind of for removing the device and method of molten steel field trash in continuous casting tundish, belong to Ferrous Metallurgy continuous casting tundish technology field.
Background technology
The flow control device being used in combination by turbulence inhibitor, barricade, gear dam is set in conticaster tundish, can change the running route of molten steel in tundish, extend the time of staying of molten steel in tundish, promote inclusion floating and removal, reduce the metallurgical function of strand inner inclusion, change inclusion morphology.In recent years, for meeting the control requirement of the high-purity clean steel of Development and Production to field trash, research application continuous casting tundish air curtain barricade wall technology, at the bottom of being placed in middle handbag by air curtain air brick, be blown into argon gas, argon gas sees through air curtain barricade wall and floats and form microbubble air curtain barrier one, and these microbubbles are flutterred field trash and caught, float, thereby adsorbed by slag blanket, reach the object of removal of inclusions cleaning molten steel.
As, Chinese patent literature CN201603865U (application number: 201020116865.1) disclose a kind of T-shaped tundish that flow control device is installed.A kind of T-shaped tundish that adopts " two wall two dams " formula flow control device, comprise inclusion, long nozzle, first, second, the 3rd, the 4th delivery port and flow control device, flow control device comprises two barricades and two gear dams, barricade is arranged symmetrically with and lays respectively at long nozzle both sides second, in inclusion cavity between the 3rd delivery port, barricade peripheral part and inclusion cavity inner wall join, barricade middle and lower part has barricade pod apertures, two gear dams are arranged symmetrically with and lay respectively at first and second delivery port, in inclusion cavity between the 3rd and the 4th delivery port, gear He Liangge side, bottom surface, dam and inclusion cavity inner wall join.Adopt " two wall two dams " formula flow control device in T-shaped tundish of the present utility model, improved the nowed forming of molten steel in tundish, extended molten steel and arrive the time of delivery port, promoted inclusion floating separation, even molten steel composition and temperature.
Chinese patent literature CN101121199 (application number: a kind of method that 200710121680.2) discloses continuous casting tundish air curtain barricade wall removal non-metallic inclusion, in tundish permanent layer, place air brick, connect argon blowing pipeline, build by laying bricks or stones after working lining, require ventilatively above air brick to show out size 0MM～40MM at the bottom of tundish, from tundish argon bottom-blowing, be conducive to inclusion particle collision and grow up and get rid of; The bubble of floating can be caught inclusion particle, and carrying it and together floating, so just make small inclusion particle ascent rate increase to the speed of bubble floating, can all replace original weir and dam in tundish (dam) with part, thereby reduce to corrode by barricade (dam) field trash of bringing molten steel into, effectively improve molten steel degree of purity.
In actual production process, prove through long-term production practices, existing flow control device and two kinds of plans of establishment of continuous casting tundish air curtain barricade wall technology all have technological deficiency: the flow control device scheme being used in combination by turbulence inhibitor, barricade, gear dam is set in (1) conticaster tundish, the field trash that equivalent diameter is greater than 50 μ m can only be effectively removed, and the small field trash that equivalent diameter is less than 50 μ m can not be effectively removed; The technical scheme of air curtain air brick is set in conticaster tundish, can only effectively removes the small field trash that equivalent diameter is less than 50 μ m, and can not effectively remove the field trash that equivalent diameter is greater than 50 μ m; (2) installation position of existing air curtain air brick is equipped with technological deficiency: existing air curtain air brick substitutes gear dam or is arranged on the pouring area between gear dam and tundish upper nozzle, and effectively removing equivalent diameter, to be less than the practical application effect of small field trash of 50 μ m poor; (3) in order to remove the effect of field trash in molten steel, the small and dense intensity of bubble diameter that requires air curtain air brick to produce is high, but the slit-type air curtain air brick that prior art is produced, its pore is larger, general equivalent diameter is greater than 50 μ m, large (through the measuring of water mould, bubble equivalent diameter is greater than 1.5mm) and quantity is few of the bubble equivalent diameter of generation, the bubble closeness that forms air curtain barricade wall is little, and the practical application effect of removal of inclusions is undesirable thus.
Chinese patent literature CN202779663U (application number: 201220454113.5) a kind of device for controlling flow of ladle, include tundish, turbulence inhibitor, be arranged with successively respectively top retaining wall, lower retaining wall 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; Outside at lower retaining wall is provided with tapping hole, is provided with the ventilative wall that a row is built by laying bricks or stones by air brick on the tundish bottom wall of inner cavity between tapping hole and lower retaining wall.Device for controlling flow of ladle utilization of the present utility model bottom is 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 made flowing of molten steel more in order mild.But there is following shortcoming in this patent, although top retaining wall, lower retaining wall can be removed the field trash that a part of equivalent diameter is greater than 50 μ m, removal effect is undesirable, and the pore of air curtain air brick is larger, the Argon Bubble diameter producing is compared with large and rare, and the whole inclusion removal that causes field trash that equivalent diameter is greater than 50 μ m and equivalent diameter to be less than 50 μ m is undesirable.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of for removing the device and method of molten steel field trash in continuous casting tundish, the position of the present invention preferred arrangement flow control device and air curtain air brick in tundish, effect obviously improves, the field trash that uses device of the present invention to make equivalent diameter in continuous casting billet be greater than 50 μ m is removed substantially, the small the amount of inclusions that in continuous casting billet, equivalent diameter is less than 50 μ m is than in use tundish, turbulence inhibitor being set merely, barricade, in the continuous casting billet that the device on gear dam is produced, field trash reduces more than 60% on year-on-year basis, than turbulence inhibitor is set merely 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 of the present invention is as follows:
A kind of for removing the device of molten steel field trash in continuous casting tundish, comprise turbulence inhibitor (1), air curtain air brick (2), barricade (3) and gear dam (4), turbulence inhibitor is arranged on the inner side of tundish beam impact zone bag wall working lining, its longitudinal centre line overlaps with the center line of large bag long nozzle, the two side ends of barricade is fixed on middle handbag wall working lining, the bottom on gear dam is fixed in tundish underwrite lining work, described barricade is between turbulence inhibitor and gear dam, it is characterized in that, air curtain air brick (2) is positioned between turbulence inhibitor (1) and barricade (3), and bottom be fixed in the middle of at the bottom of handbag in permanent liner, the horizontal range a of the longitudinal centre line of described turbulence inhibitor (1) and air curtain air brick (2) is 400～600mm, air curtain air brick (2) is 200～700mm with the horizontal range b of barricade (3), barricade (3) is 200～700mm with the horizontal range c on gear dam (4), the horizontal range d of gear dam and tundish upper nozzle is 800～1200mm, described barricade and the upper and lower interlaced arrangement in gear dam, the top of described air curtain air brick is lower than the top on the Huo Dang dam, bottom of barricade.
The present invention is further preferred, the horizontal range of the longitudinal centre line of described turbulence inhibitor (1) and air curtain air brick (2) is 550～600mm, air curtain air brick (2) is 600～700mm with the horizontal range b of barricade (3), and barricade (3) is 600～700mm with the horizontal range c on gear dam (4).
Air curtain air brick of the present invention (2) is positioned between turbulence inhibitor (1) and barricade (3), in the middle of being fixed at the bottom of handbag in permanent liner, the horizontal range a of the longitudinal centre line of described turbulence inhibitor (1) and air curtain air brick (2) is 400～600mm, air curtain air brick (2) is 200～700mm with the horizontal range b of barricade (3), barricade (3) is 200～700mm with the horizontal range c on gear dam (4), based on task of the present invention: can effectively remove the field trash that equivalent diameter is greater than 50 μ m, can effectively remove again the small field trash that equivalent diameter is less than 50 μ m, the field trash that makes equivalent diameter in continuous casting billet be greater than 50 μ m is removed substantially, improve the removal ability of molten steel field trash in tundish and regioselective, that those skilled in the art gropes to obtain through long-term experiment, the present invention is due to the effect of turbulence inhibitor, the molten steel entering in tundish flows to change, flow velocity reduces, above the air curtain air brick that molten steel is flowed through between turbulence inhibitor (1) and barricade (3), air curtain air brick blows out continuously Argon Bubble closely, form bar shaped air curtain barrier, bar shaped air curtain barrier has further reduced 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 equivalent diameter to be less than the small field trash of 50 μ m relatively active, intensive Argon Bubble is caught the inclusion floating that small inclusion floating and part equivalent diameter are greater than 50 μ m, thereby adsorbed by slag blanket, molten steel is through barricade, by the baffling of barricade, reduction of speed, arrive gear dam, part molten steel climbs over gear dam and forms upwards mobile stream thigh, another part molten steel upwards flow to surface on gear dam and sidewall intersection along sidewall, further make equivalent diameter be greater than the inclusion removal of 50 μ m, air curtain air brick and barricade, the field trash that the cooperation on gear dam makes equivalent diameter be greater than 50 μ m is substantially all removed.
The position of air curtain air brick of the present invention and air curtain air brick are apart from the distance of turbulence inhibitor, apart from the position of barricade, being those skilled in the art gropes to obtain through long-term experiment, makes small the amount of inclusions that equivalent diameter in molten steel is less than 50 μ m and reduces on year-on-year basis more than 60% than molten steel field trash in the device that turbulence inhibitor, barricade, gear dam are set merely in continuous casting tundish.
The present invention is preferred, described air curtain air brick comprises air brick matrix and air brick core body, in air brick matrix, be provided with air chamber, one end of air chamber is connected with air inlet pipe, air inlet pipe is communicated with in air chamber, the part that air inlet pipe is stretched out air brick matrix is connected with jointing, on air brick matrix above air chamber, be provided with air brick core body embedded groove, described air brick core body embeds in the embedded groove of air brick matrix, described air brick matrix adopting castable vibration moulding, air brick core body adopts the magnesia moulding of diffusion-type.Air curtain air brick of the present invention has the advantages such as bubble closeness is large that diffusion-type mechanical pressing air brick produces, and has again the low advantage of moulding by casting air brick production cost.
The present invention is preferred, the bottom of described air curtain air brick (2) imbed in the middle of at the bottom of handbag the degree of depth m of permanent liner (6) be 15～30mm, further preferred, 18～20mm.The bottom of air curtain air brick (2) imbed in the middle of at the bottom of handbag the degree of depth of permanent liner (6) ensure that air curtain air brick blowing argon gas is continuous, intensive, even on the one hand, on the other hand for the air inlet pipe of air curtain air brick is easy to connect.
Preferred according to the present invention, described barricade and gear dam up and down staggered height n are 100～150mm, and the thickness L of barricade is 100～160mm, and gear dam thickness X is 120～200mm.
Preferred according to the present invention, the upper edge of barricade is higher than the high liquid level (HLL) (8) of the molten steel of the normal cast of tundish, but lower than middle handbag edge.
Preferred according to the present invention, turbulence inhibitor of the present invention adopts combined material-structure, turbulence inhibitor is by turbulence inhibitor shell (15), turbulence inhibitor cover core (16), turbulence inhibitor base plate (17) assembles, on working face, smear anti-oxidant coating coating (18), turbulence inhibitor cover core is positioned on the madial 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 cover core is the truncated cone that upper end diameter is greater than lower end diameter, the middle hollow upper end diameter that is is less than the truncated cone in lower end diameter, described turbulence inhibitor cover core is that in adopting after castable moulding by casting, warm firing process is prepared from, described turbulence inhibitor base plate adopts magnesia carbon brick to build moulding by laying bricks or stones.
During barricade of the present invention (3), gear dam (4) are and adopt after castable moulding by casting, warm firing process is prepared from.
The present invention also provides a kind of method of removing molten steel field trash in tundish for removing the device of molten steel field trash in continuous casting tundish, comprises the following steps:
1) in liner in dundish bake process, the omnidistance Argon of air curtain air brick (2), argon pressure is controlled at 0.15～0.2MPa, and flow-control is at 10～20NL/min, to prevent tunger tube road high-temperature oxydation, distortion;
2) pre-Argon in tundish, unwrap greatly water before 20～30s, to blowing argon gas in the tundish of sealing, pass into air in argon replaces tundish by air curtain air brick (2), argon pressure is controlled at 0.15～0.2MPa, and flow-control is at 20～30NL/min;
3) unwrap greatly to water to molten steel face in tundish and arrive the Argon before normal level of liquid, the argon pressure of air curtain air brick (2) is controlled at 0.15～0.2MPa, and flow-control is at 20～30NL/min;
4) Argon of normal cast molten steel face in tundish, the argon pressure of air curtain air brick (2) is controlled at 0.2～0.3MPa, and flow-control is at 30～50NL/min,
Through evidence, this pressure, flow can control in tundish that molten steel face is micro-to be had fluctuation and can not blow the top of the slag open.
5) Argon of low molten steel face in tundish, when the replacing of large bag waits the interior cast of tundish liquid level lower than normal level of liquid, turns argon gas down, and the argon pressure of air curtain air brick (2) is controlled at 0.15～0.2MPa, and flow-control is at 20～30NL/min;
6), after tundish stops watering, stop air curtain air brick (2) Argon.
Beneficial effect of the present invention:
(1) the present invention is positioned air curtain air brick (2) between turbulence inhibitor (1) and barricade (3), and the horizontal range a of the longitudinal centre line of turbulence inhibitor (1) and air curtain air brick (2) is 400～600mm, air curtain air brick (2) is 200～700mm with the horizontal range b of barricade (3), after applying on slab CC tundish, obtain unforeseeable technique effect: apply the field trash that equivalent diameter in the continuous casting billet that device of the present invention produces is greater than 50 μ m and substantially remove, the small the amount of inclusions that in continuous casting billet, equivalent diameter is less than 50 μ m is than in use tundish, turbulence inhibitor being set merely, barricade, in the continuous casting billet that the device on gear dam is produced, field trash reduces more than 60% on year-on-year basis, than turbulence inhibitor is set merely 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 of the present invention (2) is post forming, both there is the advantages such as bubble closeness is large that diffusion-type mechanical pressing air brick produces, there is again the low advantage of moulding by casting air brick production cost, reduce production costs on year-on-year basis more than 40% than mechanical pressing air brick.
Brief description of the drawings
Fig. 1 is that the present invention is for removing the device overall structure schematic diagram of molten steel field trash in continuous casting tundish.
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, wherein, and the front view that A is barricade, the side view that B is barricade.
Fig. 5 is the structural representation that keeps off dam in the embodiment of the present invention, and wherein, A is the front view on gear dam, and B is the side view on gear dam.
In figure, 1. turbulence inhibitor; 2. air curtain air brick; 3. barricade; 4. gear dam; 5. liner in dundish; 6. tundish permanent liner; 7. tundish upper nozzle; 8. the high liquid level (HLL) of the molten steel of the normal cast of tundish; 9. large bag long nozzle; 10. air brick matrix; 11. air brick core bodys; 12. air chambers; 13. air inlet pipe; 14. jointings; 15. turbulence inhibitor shells; 16. turbulence inhibitor cover cores; 17. turbulence inhibitor base plates; 18. coatings, 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 be not limited to this.
Embodiment 1
A kind of for removing the device of molten steel field trash in continuous casting tundish, structure as Figure 1-Figure 5, comprise turbulence inhibitor 1, air curtain air brick 2, barricade 3 and gear dam 4, turbulence inhibitor 1 is arranged on the inner side of tundish beam impact zone bag wall working lining, its longitudinal centre line overlaps with the center line of large bag long nozzle 9, the two side ends of barricade 3 is fixed on middle handbag wall working lining 5, the bottom on gear dam is fixed in tundish underwrite lining work 5, described barricade 3 is between turbulence inhibitor 1 and gear dam 4, air curtain air brick 2 is between turbulence inhibitor 1 and barricade 3, and bottom be fixed in the middle of at the bottom of handbag in permanent liner, the horizontal range a of the longitudinal centre line of described turbulence inhibitor 1 and air curtain air brick 2 is 550mm, air curtain air brick 2 is 600mm with the horizontal range b of barricade 3, barricade 3 is 700mm with the horizontal range c on gear dam 4, the horizontal range d of gear dam and tundish upper nozzle is 900mm, described barricade and the upper and lower interlaced arrangement in gear dam, the top of described air curtain air brick is lower than the top on the Huo Dang dam, bottom of barricade.
Described air curtain air brick 2 comprises air brick matrix 10 and air brick core body 11, in air brick matrix 10, be provided with air chamber 12, one end of air chamber 12 is connected with air inlet pipe 13, air inlet pipe 13 is communicated with air chamber 12 is interior, the part that air inlet pipe 13 is stretched out air brick matrix 10 is connected with jointing 14, on air brick matrix 10 above air chamber 12, be provided with air brick core body embedded groove, described air brick core body 11 embeds in the embedded groove of air brick matrix, described air brick matrix adopting castable vibration moulding, air brick core body adopts the magnesia moulding of diffusion-type.The bottom of air curtain air brick 2 imbed in the middle of at the bottom of handbag the degree of depth m of permanent liner 6 be 15mm.
Barricade 3 and gear dam up and down staggered height n are 120mm, and the thickness L of barricade is 100mm, and gear dam thickness X is 120mm.The upper edge of barricade 3 is higher than the high liquid level (HLL) 8 of the molten steel of the normal cast of tundish, but lower than middle handbag edge.
Turbulence inhibitor of the present invention adopts combined material-structure, turbulence inhibitor is by turbulence inhibitor shell 15, turbulence inhibitor cover core 16, turbulence inhibitor base plate 17 assembles, on working face, smear anti-oxidant coating coating 18, turbulence inhibitor cover core is positioned on the madial 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 cover core is the truncated cone that upper end diameter is greater than lower end diameter, the middle hollow upper end diameter that is is less than the truncated cone in lower end diameter, described turbulence inhibitor cover core is that in adopting after castable moulding by casting, warm firing process is prepared from, described turbulence inhibitor base plate adopts magnesia carbon brick to build moulding by laying bricks or stones.
During barricade 3, gear dam 4 are and adopt after castable moulding by casting, warm firing process is prepared from.
Embodiment 2,
For removing the device of molten steel field trash in continuous casting tundish, difference is as described in Example 1:
The horizontal range a of the longitudinal centre line of described turbulence inhibitor 1 and air curtain air brick 2 is 600mm, air curtain air brick 2 is 700mm with the horizontal range b of barricade 3, barricade 3 is 600mm with the horizontal range c on gear dam 4, and the horizontal range d of gear dam and tundish upper nozzle is 1000mm.
The bottom of described air curtain air brick 2 imbed in the middle of at the bottom of handbag the degree of depth m of permanent liner 6 be 30mm.
Embodiment 3,
For removing the device of molten steel field trash in continuous casting tundish, difference is as described in Example 1:
The horizontal range a of the center line of described turbulence inhibitor 1 and air curtain air brick 2 is 400mm, air curtain air brick 2 is 200mm with the horizontal range b of barricade 3, barricade 3 is 200mm with the horizontal range c on gear dam 4, and the horizontal range d of gear dam and tundish upper nozzle is 1200mm.
The bottom of described air curtain air brick 2 imbed in the middle of at the bottom of handbag the degree of depth m of permanent liner 6 be 18mm.
Embodiment 4,
A method of removing molten steel field trash in tundish for removing the device of molten steel field trash in continuous casting tundish described in embodiment 1, comprises the following steps:
1) in liner in dundish bake process, the omnidistance Argon of air curtain air brick 2, argon pressure is controlled at 0.15MPa, and flow-control is at 10NL/min, to prevent tunger tube road high-temperature oxydation, distortion;
2) pre-Argon in tundish, unwrap greatly water before 20s, to blowing argon gas in the tundish of sealing, pass into air in argon replaces tundish by air curtain air brick 2, argon pressure is controlled at 0.15MPa, flow-control is at 20NL/min;
3) unwrap greatly to water to molten steel face in tundish and arrive the Argon before normal level of liquid, the argon pressure of air curtain air brick 2 is controlled at 0.15MPa, and flow-control is at 20NL/min;
4) Argon of normal cast molten steel face in tundish, the argon pressure of air curtain air brick (2) is controlled at 0.2MPa, and flow-control is at 30NL/min,
5) Argon of low molten steel face in tundish, when the replacing of large bag waits the interior cast of tundish liquid level lower than normal level of liquid, turns argon gas down, and the argon pressure of air curtain air brick (2) is controlled at 0.15MPa, and flow-control is at 20NL/min;
6), after tundish stops watering, stop air curtain air brick (2) Argon.
Embodiment 5,
A method of removing molten steel field trash in tundish for removing the device of molten steel field trash in continuous casting tundish described in embodiment 1, comprises the following steps:
1) in liner in dundish bake process, the omnidistance Argon of air curtain air brick 2, argon pressure is controlled at 0.2MPa, and flow-control is at 20NL/min, to prevent tunger tube road high-temperature oxydation, distortion;
2) pre-Argon in tundish, unwrap greatly water before 30s, to blowing argon gas in the tundish of sealing, pass into air in argon replaces tundish by air curtain air brick 2, argon pressure is controlled at 0.2MPa, flow-control is at 30NL/min;
3) unwrap greatly to water to molten steel face in tundish and arrive the Argon before normal level of liquid, the argon pressure of air curtain air brick 2 is controlled at 0.2MPa, and flow-control is at 30NL/min;
4) Argon of normal cast molten steel face in tundish, the argon pressure of air curtain air brick 2 is controlled at 0.3MPa, and flow-control is at 50NL/min,
5) Argon of low molten steel face in tundish, when the replacing of large bag waits the interior cast of tundish liquid level lower than normal level of liquid, turns argon gas down, and the argon pressure of air curtain air brick (2) is controlled at 0.2MPa, and flow-control is at 30NL/min;
6), after tundish stops watering, stop air curtain air brick (2) Argon.
Comparative example 1
A kind of for removing the device of molten steel field trash in continuous casting tundish, comprise turbulence inhibitor, barricade, gear dam, turbulence inhibitor is arranged on the inner side of tundish beam impact zone bag wall working lining, its center line overlaps with the center line of large bag long nozzle, the two side ends of barricade is fixed on middle handbag wall working lining, the bottom on gear dam is fixed in tundish underwrite lining work, the upper edge of barricade is higher than the high liquid level (HLL) of the molten steel of the normal cast of tundish, but lower than the working face of tundish overfall coating, barricade and the upper and lower interlaced arrangement in gear dam; Longitudinal center's linear distance of barricade and turbulence inhibitor is 550mm, and the horizontal range of gear dam and barricade is 600mm, and the horizontal range of gear dam and tundish upper nozzle is 1200mm.
Comparative example 2
A kind of for removing the device of molten steel field trash in continuous casting tundish, comprise turbulence inhibitor and air curtain air brick, turbulence inhibitor is arranged on the inner side of tundish beam impact zone bag wall working lining, its longitudinal centre line overlaps with the center line of large bag long nozzle 9, air curtain air brick is between turbulence inhibitor and tundish upper nozzle, bottom be fixed in the middle of at the bottom of handbag in permanent liner 6, the horizontal range between the longitudinal centre line of described turbulence inhibitor 1 and air curtain air brick 2 is 550mm.
Air curtain air brick comprises air brick matrix and air brick core body, in air brick matrix, be provided with air chamber, one end of air chamber is connected with air inlet pipe, air inlet pipe is communicated with in air chamber, the part that air inlet pipe is stretched out air brick matrix is connected with jointing, on air brick matrix above air chamber, be provided with air brick core body embedded groove, described air brick core body embeds in the embedded groove of air brick matrix, described air brick matrix adopting castable vibration moulding, air brick core body adopts the magnesia moulding of diffusion-type.The bottom of air curtain air brick imbed in the middle of at the bottom of handbag the degree of depth m of permanent liner be 15mm.
Comparative example 3
A kind of for removing the device of molten steel field trash in continuous casting tundish, comprise turbulence inhibitor 1, air curtain air brick 2, barricade 3 and gear dam 4, turbulence inhibitor 1 is arranged on the inner side of tundish beam impact zone bag wall working lining, its longitudinal centre line overlaps with the center line of large bag long nozzle 9, barricade 3 is fixed on middle handbag wall working lining 5, gear dam is between barricade 3 and tundish upper nozzle 7, and be fixed in tundish underwrite lining work 5, barricade 3 is crisscross arranged up and down with gear dam 4, air curtain air brick 2 is between gear dam and tundish upper nozzle, in the middle of being fixed at the bottom of handbag in permanent liner 6, horizontal range a between longitudinal centre line and the barricade of described turbulence inhibitor 1 is 400mm, barricade is 600mm with the horizontal range b on gear dam, the horizontal range of gear 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 field trash in the removal continuous casting tundish of embodiment 1～3 and comparative example 1～3, on the wide slab CC tundish of Laiwu steel enterprise Yin Shan shaped steel Co., Ltd steel mill single current, apply comparative analysis, steel grade AH36, get respectively casting blank sample, specimen size is that length and width is 30mm, adopt Electronic Speculum to detect and analyze, in visual field, electrolysis the amount of inclusions is as shown in table 1
Electrolysis the amount of inclusions in table 1 visual field (unit: individual)
By the Data Comparison of table 1, apply device of the present invention, in visual field, in the continuous casting billet that embodiment of the present invention 1-3 produces equivalent diameter be greater than 50 μ m and equivalent diameter be zero in the electrolysis the amount of inclusions of 40～50 μ m, and also there will be minority equivalent diameter to be greater than the electrolysis field trash of 50 μ m in the continuous casting billet that comparative example 1-3 produces, and the continuous casting billet produced more than embodiment of the present invention 1-3 a little in the electrolysis the amount of inclusions of 40～50 μ m of equivalent diameter, in the continuous casting billet that comparative example 1-3 produces, equivalent diameter is less than electrolysis the amount of inclusions in the continuous casting billet that the electrolysis the amount of inclusions of 40 μ m obviously produces more than embodiment of the present invention 1-3, therefore apply device of the present invention, the field trash that makes equivalent diameter in continuous casting billet be greater than 50 μ m is removed substantially, the small the amount of inclusions that in continuous casting billet, equivalent diameter is less than 50 μ m is than in use tundish, turbulence inhibitor being set merely, barricade, in the continuous casting billet that the device on gear dam is produced, field trash reduces 62.5% on year-on-year basis, than turbulence inhibitor is set merely 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 gear dam and tundish upper nozzle the continuous casting billet produced of device in field trash reduce on year-on-year basis 40%.
Claims (9)
1. one kind for removing the device of molten steel field trash in continuous casting tundish, comprise turbulence inhibitor (1), air curtain air brick (2), barricade (3) and gear dam (4), turbulence inhibitor is arranged on the inner side of tundish beam impact zone bag wall working lining, its longitudinal centre line overlaps with the center line of large bag long nozzle, the two side ends of barricade is fixed on middle handbag wall working lining, the bottom on gear dam is fixed in tundish underwrite lining work, described barricade is between turbulence inhibitor and gear dam, it is characterized in that, air curtain air brick (2) is positioned between turbulence inhibitor (1) and barricade (3), and bottom be fixed in the middle of at the bottom of handbag in permanent liner, the horizontal range a of the longitudinal centre line of described turbulence inhibitor (1) and air curtain air brick (2) is 400～600mm, air curtain air brick (2) is 200～700mm with the horizontal range b of barricade (3), barricade (3) is 200～700mm with the horizontal range c on gear dam (4), the horizontal range d of gear dam and tundish upper nozzle is 800～1200mm, described barricade and the upper and lower interlaced arrangement in gear dam, the top of described air curtain air brick is lower than the top on the Huo Dang dam, bottom of barricade.
According to described in claims 1 for removing the device of molten steel field trash in continuous casting tundish, 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, air curtain air brick (2) is 600～700mm with the horizontal range b of barricade (3), and barricade (3) is 600～700mm with the horizontal range c on gear dam (4).
According to described in claims 1 for removing the device of molten steel field trash in continuous casting tundish, it is characterized in that, described air curtain air brick comprises air brick matrix and air brick core body, in air brick matrix, be provided with air chamber, one end of air chamber is connected with air inlet pipe, air inlet pipe is communicated with in air chamber, the part that air inlet pipe is stretched out air brick matrix is connected with jointing, on air brick matrix above air chamber, be provided with air brick core body embedded groove, described air brick core body embeds in the embedded groove of air brick matrix, described air brick matrix adopting castable vibration moulding, air brick core body adopts the magnesia moulding of diffusion-type.
According to described in claims 1 for removing the device of molten steel field trash in continuous casting tundish, it is characterized in that, the bottom of described air curtain air brick (2) imbed in the middle of at the bottom of handbag the degree of depth m of permanent liner (6) be 15～30mm.
According to described in claims 4 for removing the device of molten steel field trash in continuous casting tundish, it is characterized in that 18～20mm.
According to described in claims 1 for removing the device of molten steel field trash in continuous casting tundish, it is characterized in that, described barricade and gear dam up and down staggered height n are 100～150mm, and the thickness L of barricade is 100～160mm, and gear dam thickness X is 120～200mm.
According to described in claims 1 for removing the device of molten steel field trash in continuous casting tundish, it is characterized in that, the upper edge of barricade is higher than the high liquid level (HLL) (8) of the molten steel of the normal cast of tundish, but lower than middle handbag edge.
According to described in claims 1 for removing the device of molten steel field trash in continuous casting tundish, it is characterized in that, turbulence inhibitor of the present invention adopts combined material-structure, turbulence inhibitor is by turbulence inhibitor shell (15), turbulence inhibitor cover core (16), turbulence inhibitor base plate (17) assembles, on working face, smear anti-oxidant coating coating (18), turbulence inhibitor cover core is positioned on the madial 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 cover core is the truncated cone that upper end diameter is greater than lower end diameter, the middle hollow truncated cone that upper end diameter is less than lower end diameter that is, described turbulence inhibitor cover core is that in adopting after castable moulding by casting, warm firing process is prepared from, described turbulence inhibitor base plate adopts magnesia carbon brick to build moulding by laying bricks or stones, during barricade (3), gear dam (4) are and adopt after castable moulding by casting, warm firing process is prepared from.
9. a method of removing molten steel field trash in tundish for removing the device of molten steel field trash in continuous casting tundish claimed in claim 1, comprises the following steps:
1) in liner in dundish bake process, the omnidistance Argon of air curtain air brick (2), argon pressure is controlled at 0.15～0.2MPa, and flow-control is at 10～20NL/min, to prevent tunger tube road high-temperature oxydation, distortion;
2) pre-Argon in tundish, unwrap greatly water before 20～30s, to blowing argon gas in the tundish of sealing, pass into air in argon replaces tundish by air curtain air brick (2), argon pressure is controlled at 0.15～0.2MPa, and flow-control is at 20～30NL/min;
3) unwrap greatly to water to molten steel face in tundish and arrive the Argon before normal level of liquid, the argon pressure of air curtain air brick (2) is controlled at 0.15～0.2MPa, and flow-control is at 20～30NL/min;
4) Argon of normal cast molten steel face in tundish, the argon pressure of air curtain air brick (2) is controlled at 0.2～0.3MPa, and flow-control is at 30～50NL/min,
5) Argon of low molten steel face in tundish, when the replacing of large bag waits the interior cast of tundish liquid level lower than normal level of liquid, turns argon gas down, and the argon pressure of air curtain air brick (2) is controlled at 0.15～0.2MPa, and flow-control is at 20～30NL/min;
6), after tundish stops watering, stop air curtain air brick (2) Argon.
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| CN106041042A (en) * | 2016-08-18 | 2016-10-26 | 四川西南不锈钢有限责任公司 | Special-shaped stainless steel continuous casting tundish |
| CN106513608A (en) * | 2016-12-12 | 2017-03-22 | 山东钢铁股份有限公司 | Covered argon blowing refining device for slab continuous casting tundish strip-shaped air brick and argon control method |
| CN106670445A (en) * | 2016-12-12 | 2017-05-17 | 山东钢铁股份有限公司 | Argon-blowing refining device for continuous casting tundish and argon control method |
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| CN115198055A (en) * | 2022-06-16 | 2022-10-18 | 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 |
| CN115213387A (en) * | 2021-04-15 | 2022-10-21 | 宝山钢铁股份有限公司 | Continuous casting tundish and preparation method thereof |
| CN115319072A (en) * | 2022-06-16 | 2022-11-11 | 莱芜钢铁集团银山型钢有限公司 | Continuous casting tundish turbulence controller with molten steel purification function and installation method thereof |
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| CN106041042A (en) * | 2016-08-18 | 2016-10-26 | 四川西南不锈钢有限责任公司 | Special-shaped stainless steel continuous casting tundish |
| CN106513608A (en) * | 2016-12-12 | 2017-03-22 | 山东钢铁股份有限公司 | Covered argon blowing refining device for slab continuous casting tundish strip-shaped air brick and argon control method |
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| CN106670445B (en) * | 2016-12-12 | 2019-02-26 | 山东钢铁股份有限公司 | One kind being used for continuous casting production ar blowing refining device and argon gas control method |
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| CN111448012A (en) * | 2017-12-11 | 2020-07-24 | 株式会社Posco | Molten material processing apparatus |
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| CN114734031A (en) * | 2022-04-11 | 2022-07-12 | 成都先进金属材料产业技术研究院股份有限公司 | Pouring chute of vacuum induction furnace and pouring method of vacuum induction smelting |
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| CN115198055A (en) * | 2022-06-16 | 2022-10-18 | 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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Inventor after: Wu Guangjun Inventor after: Xi Chao Inventor after: Yin Xiaoxia Inventor after: Zhang Chunlong Inventor after: Wang Xuge Inventor before: Wu Guangjun Inventor before: Xi Chao |
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Effective date of registration: 20220616 Address after: 271104 Shuangquan Road, Gangcheng District, Jinan City, Shandong Province Patentee after: LAIGANG GROUP YINSHAN SHAPED STEEL Co.,Ltd. Address before: Friendship Street 271104 Shandong province Laiwu City Gangcheng District No. 38 Patentee before: LAIWU STEEL Group Ltd. |