CN203956070U - A kind of for removing the device of molten steel field trash in continuous casting tundish - Google Patents
A kind of for removing the device of molten steel field trash in continuous casting tundish Download PDFInfo
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- CN203956070U CN203956070U CN201420253180.XU CN201420253180U CN203956070U CN 203956070 U CN203956070 U CN 203956070U CN 201420253180 U CN201420253180 U CN 201420253180U CN 203956070 U CN203956070 U CN 203956070U
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Abstract
The utility model relates to a kind of for removing the device of molten steel field trash in continuous casting tundish, comprise turbulence inhibitor, air curtain air brick, barricade and gear dam, air curtain air brick (2) is positioned between turbulence inhibitor (1) and barricade (3), be fixed at the bottom of tundish bag in permanent liner, the longitudinal centre line of described turbulence inhibitor (1) and air curtain air brick (2) horizontal range a are 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), application the utility model, 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 more than 60% on year-on-year basis, than turbulence inhibitor is set merely in continuous casting tundish, in the continuous casting billet that the device that air curtain is ventilative is produced, field trash reduces more than 30%.
Description
Technical field
The utility model relates to a kind of for removing the device of molten steel field trash in continuous casting tundish, belongs 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 soon air curtain air brick will be placed in tundish bag, 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 by slag blanket, adsorbed, 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.The T-shaped tundish of a kind of employing " 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 the time that molten steel arrives delivery port, promoted inclusion floating separated, even molten steel composition and temperature.
Chinese patent literature CN101121199 (application number: 200710121680.2) disclose a kind of method that continuous casting tundish air curtain barricade wall is removed 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, through long-term production practices, prove, 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, and the bubble equivalent diameter of generation is large (through the measuring of water mould, bubble equivalent diameter is greater than 1.5mm) and quantity is few, 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, in the turbulence inhibitor left and right sides, be arranged with successively respectively top retaining wall, lower retaining wall, 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, it is a kind of for removing the device of molten steel field trash in continuous casting tundish that the utility model provides, the position of the utility model preferred arrangement flow control device and air curtain air brick in tundish, effect obviously improves, the field trash that uses device of the present utility model 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%.
The technical solution of the utility model 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 tundish bag 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 is fixed at the bottom of tundish bag 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 utility model 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 utility model (2) is positioned between turbulence inhibitor (1) and barricade (3), be fixed at the bottom of tundish bag 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 utility model: can effectively remove the field trash that equivalent diameter is greater than 50 μ m, can effectively remove the small field trash that equivalent diameter is less than 50 μ m again, 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 utility model 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, extended the time of staying of molten steel in tundish, improved 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 the stream thigh that makes progress mobile, 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 utility model and air curtain air brick are apart from the distance of turbulence inhibitor, position apart from 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 more than 60% on year-on-year basis than molten steel field trash in the device that turbulence inhibitor, barricade, gear dam are set merely in tundish.
The utility model 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 utility model has the advantages such as bubble closeness that diffusion-type mechanical pressing air brick produces is large, has again the low advantage of moulding by casting air brick production cost.
The utility model is preferred, and it is 15～30mm that the degree of depth m of permanent liner (6) at the bottom of tundish bag is imbedded in the bottom of described air curtain air brick (2), further preferred, 18～20mm.The bottom of air curtain air brick (2) is imbedded the degree of depth of permanent liner (6) at the bottom of tundish bag and is guaranteed that on the one hand air curtain air brick blowing argon gas is continuous, intensive, even, on the other hand for the air inlet pipe of air curtain air brick is easy to connect.
Preferred according to the utility model, 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 utility model, 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 tundish bag edge.
Preferred according to the utility model, turbulence inhibitor of the present utility model 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 utility model (3), gear dam (4) are and adopt after castable moulding by casting, warm firing process is prepared from.
The method of removing molten steel field trash in tundish for removing the device of molten steel field trash in continuous casting tundish of the present utility model, step is as follows:
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, by air curtain air brick (2), to blowing argon gas in the tundish of sealing, pass into air in argon replaces tundish, 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.
The beneficial effects of the utility model:
(1) the utility model 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, obtained unforeseeable technique effect: apply the field trash that equivalent diameter in the continuous casting billet that device of the present utility model 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) the utility model air curtain air brick (2) is the damascene structures of post forming, both there is the advantages such as bubble closeness that diffusion-type mechanical pressing air brick produces is large, there is again the low advantage of moulding by casting air brick production cost, than mechanical pressing air brick, reduce production costs more than 40% on year-on-year basis.
Accompanying drawing explanation
Fig. 1 is that the utility model 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 utility model embodiment, 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 utility model embodiment.
Fig. 4 is the structural representation of barricade in the utility model embodiment, wherein, and the front view that A is barricade, the side view that B is barricade.
Fig. 5 keeps off the structural representation on dam in the utility model embodiment, 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. keep off 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. wrap greatly 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.
The specific embodiment
Below in conjunction with specific embodiment, the utility model is described in further detail, 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 tundish bag 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 is fixed at the bottom of tundish bag 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.It is 15mm that the degree of depth m of permanent liner 6 at the bottom of tundish bag is imbedded in the bottom of air curtain air brick 2.
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 tundish bag edge.
Turbulence inhibitor of the present utility model 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.
It is 30mm that the degree of depth m of permanent liner 6 at the bottom of tundish bag is imbedded in the bottom of described air curtain air brick 2.
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.
It is 18mm that the degree of depth m of permanent liner 6 at the bottom of tundish bag is imbedded in the bottom of described air curtain air brick 2.
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 tundish bag 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 is fixed at the bottom of tundish bag in permanent liner 6, and 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.It is 15mm that the degree of depth m of permanent liner at the bottom of tundish bag is imbedded in the bottom of air curtain air brick.
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 tundish bag 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, be fixed at the bottom of tundish bag in permanent liner 6, the longitudinal centre line of described turbulence inhibitor 1 and the horizontal range a between barricade are 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 utility model, in visual field, in the continuous casting billet that the utility model embodiment 1-3 produces equivalent diameter be greater than 50 μ m and the electrolysis the amount of inclusions of equivalent diameter in 40～50 μ m be zero, 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 the utility model embodiment 1-3 a little of the electrolysis the amount of inclusions of equivalent diameter in 40～50 μ m, 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 the utility model embodiment 1-3, therefore apply device of the present utility model, 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 (1)
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 tundish bag 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 is fixed at the bottom of tundish bag 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.
2
.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).
3
.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.
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, it is 15～30mm that the degree of depth m of permanent liner (6) at the bottom of tundish bag is imbedded in the bottom of described air curtain air brick (2).
5
.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.
6
.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.
7
.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 tundish bag edge.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420253180.XU CN203956070U (en) | 2014-05-16 | 2014-05-16 | A kind of for removing the device of molten steel field trash in continuous casting tundish |
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| CN201420253180.XU CN203956070U (en) | 2014-05-16 | 2014-05-16 | A kind of for removing the device of molten steel field trash in continuous casting tundish |
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| CN203956070U true CN203956070U (en) | 2014-11-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103990787A (en) * | 2014-05-16 | 2014-08-20 | 莱芜钢铁集团有限公司 | Device and method for removing molten steel slag inclusion in continuous casting tundish |
| CN109940157A (en) * | 2017-12-21 | 2019-06-28 | 维苏威美国公司 | Tundish with construction |
-
2014
- 2014-05-16 CN CN201420253180.XU patent/CN203956070U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103990787A (en) * | 2014-05-16 | 2014-08-20 | 莱芜钢铁集团有限公司 | Device and method for removing molten steel slag inclusion in continuous casting tundish |
| CN103990787B (en) * | 2014-05-16 | 2016-07-06 | 莱芜钢铁集团有限公司 | A kind of for removing the device and method of molten steel inclusion in continuous casting production |
| CN109940157A (en) * | 2017-12-21 | 2019-06-28 | 维苏威美国公司 | Tundish with construction |
| US11154925B2 (en) * | 2017-12-21 | 2021-10-26 | Vesuvius U S A Corporation | Configured tundish |
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