CN203804184U - Metallurgy device for removing molten steel inclusion in two-strand slab continuous casting machine tundish - Google Patents
Metallurgy device for removing molten steel inclusion in two-strand slab continuous casting machine tundish Download PDFInfo
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- CN203804184U CN203804184U CN201420253573.0U CN201420253573U CN203804184U CN 203804184 U CN203804184 U CN 203804184U CN 201420253573 U CN201420253573 U CN 201420253573U CN 203804184 U CN203804184 U CN 203804184U
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Abstract
The utility model relates to a metallurgy device for removing molten steel inclusion in two-strand slab continuous casting machine tundish. An air curtain air brick, a first retaining dam (1) and a second retaining dam (2) are sequentially parallelly arranged between a turbulence controller and the water feed inlet of one tundish at intervals. The horizontal distance c from the air curtain air brick to the longitudinal central line of the turbulence controller (4) is 600-800mm. The horizontal distance b from the first retaining dam (1) to the air curtain air brick is 200-400mm. The horizontal distance a from the second retaining dam (2) and the water feed inlet (7) of the tundish is 400-600mm. The height of the first retaining dam is larger than that of the second retaining dam. By the metallurgy device, the inclusion with equivalent diameter larger than 50 micrometers in a continuous casting slab is removed completely, the number of micro inclusion with the equivalent diameter smaller than 50 micrometers in the casting slab is reduced by more than 40% as compared with the number of micro inclusion with the equivalent diameter smaller than 50 micrometers in the casting slab produced by a device with a turbulence controller, a retaining wall and a retaining dam disposed in the two-strand slab continuous casting machine tundish, and the service life of the tundish is prolonged by 3-4 hours.
Description
Technical field
The utility model relates to a kind of for removing the metallurgical device of molten steel field trash in double flow tray billet continuous casting machine tundish, belongs to Ferrous Metallurgy continuous casting tundish technology field.
Background technology
Continuous casting tundish is as the metallurgical reaction between ladle and crystallizer, along with improving constantly that continuous casting billet quality requires, its effect is developed into and is had the inclusion floating of promotion, separation by basic functions such as initial decompression, current stabilization, storage steel, shuntings, prevent secondary oxidation of steel, control inclusion morphology and molten steel is carried out to the metallurgical function of microalloying.
General double flow tray billet continuous casting machine tundish comprises tundish inclusion, in inclusion, be provided with turbulence inhibitor, the bottom of inclusion has two tundish upper nozzles, turbulence inhibitor is arranged between two tundish upper nozzles, 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 invention, 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, can only effectively remove the field trash that equivalent diameter is greater than 50 μ m, and can not effectively remove the small field trash that equivalent diameter is less than 50 μ m, enable to remove the field trash that is greater than 50 μ m except equivalent diameter, can not remove completely; The technical scheme of air curtain air brick is set in conticaster tundish, can only effectively remove 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, and equivalent diameter to be less than the small inclusion removal effect of 50 μ m also undesirable; (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; (4) in double flow tray billet continuous casting machine tundish, settle the technological deficiency after barricade: in the impact zone between two barricades installing in symmetry, the one, the slag that floats over liquid level in impact zone can not pass through the regular deslagging of overfall, the 2nd, the tundish covering flux adding in impacting can not flow with slag, realize uniform fold slag face, and then cause the exposed and secondary oxidation of molten steel, produce new field trash.
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 invention 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 metallurgical device of molten steel field trash in double flow tray billet continuous casting machine tundish that the utility model provides, the utility model reasonably optimizing in double flow tray billet continuous casting machine tundish is arranged the position of flow control device and air curtain air brick, 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 all removed, the small the amount of inclusions that in continuous casting billet, equivalent diameter is less than 50 μ m is than in the double-current tundish of use, turbulence inhibitor being set, barricade, in the continuous casting billet that the device on gear dam is produced, field trash reduces more than 40% on year-on-year basis, than turbulence inhibitor is set merely in double-current tundish, in the continuous casting billet that the device that air curtain is ventilative is produced, field trash reduces more than 20%, in tundish, barricade is not set simultaneously, artesian flow and the uniform fold of coverture in regular slagging operation and tundish are realized, extend on year-on-year basis 3～4 hours service life of tundish.
The technical solution of the utility model is as follows:
A kind of for removing the metallurgical device of molten steel field trash in double flow tray billet continuous casting machine tundish, comprise the first gear dam (1), the second gear dam (2), air curtain air brick (3) and turbulence inhibitor (4), turbulence inhibitor (4) is arranged on the inner side of continuous casting of two strands in parallel machine tundish beam impact zone bag wall working lining, its longitudinal centre line overlaps with the center line of large bag long nozzle, and between two tundish upper nozzles, it is characterized in that, described air curtain air brick, the first gear dam (1), the second gear dam (2) is two, be symmetricly set on the both sides of turbulence inhibitor, air curtain air brick, the first gear dam (1), the second gear dam (2) successively spaced and parallel is arranged between turbulence inhibitor and one of them tundish upper nozzle, air curtain air brick (3) is positioned between turbulence inhibitor (4) and the first gear dam (1), in the middle of being fixed at the bottom of handbag in permanent liner (5), and bottom is imbedded in tundish underwrite lining work (6), the horizontal range c of the longitudinal centre line of described air curtain air brick and turbulence inhibitor (4) is 600～800mm, the first gear dam, the bottom on the second gear dam be fixed in the middle of at the bottom of handbag in permanent liner (5), the first gear dam (1) is 200～400mm with the horizontal range b of air curtain air brick, the second gear dam (2) is 400～600mm with the horizontal range a of tundish upper nozzle (7), the height on described the first gear dam is higher than the height on the second gear dam, be respectively arranged with the first pod apertures (9) at the two ends on the first gear dam, the center line of its first pod apertures (9) is 40 °～70 ° with the center line angle β of vertical the first gear dam body.
The utility model is preferred, and the height H on described the first gear dam (1) is 450～700mm, further preferred, and the height H on described the first gear dam (1) is 550～600mm.
The utility model is preferred, described air curtain air brick (3) is 650～750mm with the horizontal range c of the longitudinal centre line of turbulence inhibitor (4), the first gear dam (1) is 250～300mm with the horizontal range b of air curtain air brick (3), and the second gear dam (2) is 400～450mm with the horizontal range a of tundish upper nozzle (7); The first described pod apertures is from tilting obliquely gradually near laterally closer the second gear dam one side of air curtain air brick (3), and the center line of the first pod apertures (9) is 45 °～60 ° with the center line angle β of vertical the first gear dam body.
The height on the first gear dam (1) of the present utility model, the center line of the first pod apertures and the vertical center line angle that keeps off dam body, the horizontal range c of the longitudinal centre line of air curtain air brick and turbulence inhibitor (4), the first gear dam (1) is all based on task of the present utility model with the horizontal range b of air curtain air brick and the second gear dam (2) with tundish upper nozzle (7) horizontal range a: the field trash that can make equivalent diameter in continuous casting billet be greater than 50 μ m is all removed, can improve again the removal ability that equivalent diameter is less than the small field trash of 50 μ m, entirety improves the removal ability of molten steel field trash in tundish, extend service life of 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 continuous casting of two strands in parallel tundish flows to change, flow velocity reduces, the molten steel turbulence inhibitor (4) of flowing through is shunted to turbulence inhibitor (4) both sides respectively, flow through air curtain air brick top, 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, most of molten steel climbs over the first gear dam (1) from liquid level and forms upwards mobile stream thigh, part molten steel first pod apertures (9) from the first gear dam (1) is passed, because the first pod apertures tilts gradually obliquely from a side on the laterally closer second gear dam near air curtain air brick (3), molten steel flows along top on the first water conservancy diversion hole deviation, drive a part of inclusion floating to be adsorbed by slag blanket, also have few part on the baffling on the second gear dam (2) is backward, to flow to surface along the moving molten steel of bag underflow, further make equivalent diameter be greater than the inclusion removal of 50 μ m, the field trash that device of the present utility model makes equivalent diameter in continuous casting billet be greater than 50 μ m is all removed, artesian flow and the uniform fold of regular slagging operation and tundish covering flux are realized, extend the service life of tundish.
Air curtain air brick of the present utility model, the first gear dam (1), the ad-hoc location on the second gear dam, the horizontal range c of the longitudinal centre line of air curtain air brick and turbulence inhibitor (4), the first gear dam (1) is that those skilled in the art gropes to obtain through long-term experiment with the horizontal range b of air curtain air brick, applying the field trash that device of the present utility model makes equivalent diameter in continuous casting billet be greater than 50 μ m all removes, the small the amount of inclusions that in continuous casting billet, equivalent diameter is less than 50 μ m is than in the double-current tundish of use, turbulence inhibitor being set, barricade, in the continuous casting billet that the device on gear dam is produced, field trash reduces more than 40% 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 20%.
The utility model is preferred, and the thickness L on described the first gear dam (1) is 100～160mm, and the first pod apertures on the first gear dam lays respectively at 1/4 place, dam two ends, and the radius R of the first pod apertures (9) is 35～45mm.
According to the utility model, preferably, be symmetrically arranged with respectively two circle the second pod apertures (19) at the two ends of the second gear dam body, the radius r of the second pod apertures is 35～45mm, and the distance of the second pod apertures center line and continuous casting of two strands in parallel machine tundish underwrite lining work upper surface is 40～70mm.
According to the utility model, preferred, the height k on described the second gear dam (2) is 250～350mm, and the thickness X on the second gear dam (2) is 120～180mm.
Preferred according to the utility model, described turbulence inhibitor is by turbulence inhibitor shell (10), turbulence inhibitor cover core (11), turbulence inhibitor base plate (12) assembles, on working face, smear anti-oxidant coating coating, 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.
The utility model is preferred, described air curtain air brick (3), comprise air curtain air brick body (13), its profile is rectangle, in air curtain air brick body (13), be provided with circular air chamber (14), one end of air chamber is set with sleeve pipe (15), in arranging on the port inner wall of sleeve pipe, connect silk, described sleeve pipe is connected with air inlet pipe (16) by the interior silk that connects, air inlet pipe is communicated with in air chamber by sleeve pipe, the other end of air inlet pipe is connected with nipple (17), air inlet pipe is connected with source of the gas by nipple, described air brick body is the magnesia air brick of diffusion-type, adopt prior art mechanical pressing.
The utility model is preferred, and the height that the upper surface of described air curtain air brick body exceeds tundish underwrite lining work is 5～10mm.
During the first gear dam of the present utility model, the second gear dam 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 metallurgical device of molten steel field trash in double flow tray billet continuous casting machine tundish of the present utility model, comprises the following steps:
1) in double flow tray billet continuous casting machine liner in dundish (6) bake process, the omnidistance Argon of air curtain air brick (3), 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) the pre-Argon of double flow tray billet continuous casting machine tundish, unwrap greatly water before 20～30s, by air curtain air brick (3) to sealing double flow tray billet continuous casting machine tundish in blowing argon gas, argon pressure is controlled at 0.25～0.3MPa, flow-control, at 20～30NL/min, passes into air in argon replaces continuous casting of two strands in parallel machine tundish;
3) unwrap greatly to water to molten steel face in double flow tray billet continuous casting machine tundish and arrive the Argon before normal level of liquid, the argon pressure of air curtain air brick (3) is controlled at 0.25～0.3MPa, and flow-control is at 20～30NL/min;
4) Argon of normal cast molten steel face in double flow tray billet continuous casting machine tundish, the argon pressure of air curtain air brick (3) is controlled at 0.15～0.2MPa, and flow-control is at 10～20NL/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) when cast liquid level is lower than normal level of liquid in double flow tray billet continuous casting machine tundish, turn argon gas down, the argon pressure of air curtain air brick (3) is controlled at 0.15～0.2MPa, and flow-control is at 5～10NL/min;
6), after double flow tray billet continuous casting machine tundish stops watering, stop air curtain air brick (3) Argon.
The beneficial effects of the utility model:
The utility model is positioned air curtain air brick (3) between turbulence inhibitor (4) and the first gear dam (1), cancel barricade, increase the first gear dam (1), and axial line positive pitch β is set on the first gear dam (1) is first pod apertures (9) of 40 °～70 °, after applying on double flow tray billet continuous casting machine continuous casting tundish, obtain unforeseeable technique effect: apply the field trash that device of the present utility model makes equivalent diameter in continuous casting billet be greater than 50 μ m and all remove, the small the amount of inclusions that in continuous casting billet, equivalent diameter is less than 50 μ m is than in use double flow tray billet continuous casting machine tundish, turbulence inhibitor being set, barricade, in the continuous casting billet that the device on gear dam is produced, field trash reduces more than 40% on year-on-year basis, than turbulence inhibitor is set merely in double-current tundish, in the continuous casting billet that the device that air curtain is ventilative is produced, field trash reduces more than 20%, than being symmetrical arranged air curtain air brick in double-current tundish, gear dam, in the continuous casting billet that the device of barricade and turbulence inhibitor is produced, field trash reduces more than 25%, in tundish, barricade is not set simultaneously, artesian flow and the uniform fold of regular slagging operation and tundish covering flux are realized, extend on year-on-year basis 3～4 hours service life of tundish.
The utility model has been obtained unforeseeable technique effect after applying on Laiwu steel enterprise Yin Shan shaped steel Co., Ltd steel mill double flow tray billet continuous casting machine tundish: in steel grade X80 continuous casting billet, do not find that equivalent diameter is greater than the field trash of 50 μ m, the small the amount of inclusions that in continuous casting billet, equivalent diameter is less than 50 μ m is than in use double flow tray billet continuous casting machine tundish, turbulence inhibitor being set, barricade, in the continuous casting billet that the device on gear dam is produced, field trash reduces 45.5% on year-on-year basis, than turbulence inhibitor is set merely in double-current tundish, in the continuous casting billet that the device that air curtain is ventilative is produced, field trash reduces 20.1%, than being symmetrical arranged air curtain air brick in double-current tundish, gear dam, in the continuous casting billet that the device of barricade and turbulence inhibitor is produced, field trash reduces 29.4%, in tundish, barricade is not set simultaneously, artesian flow and the uniform fold of regular slagging operation and tundish covering flux are realized, make extend to 10～12 hours by 6～8 hours the service life of tundish.
Brief description of the drawings
Fig. 1 is that the utility model is for removing the metallurgical apparatus structure schematic diagram of molten steel field trash in double flow tray billet continuous casting machine tundish.
Fig. 2 is the A-A sectional structure schematic diagram of Fig. 1.
Fig. 3 is the structural representation on the first gear dam in the utility model embodiment, and wherein, A is the front view on the first gear dam, and B is the side view on the first gear dam.
Fig. 4 is the structural representation of turbulence inhibitor in the utility model embodiment, wherein, and the front view that A is turbulence inhibitor, the top view that B is turbulence inhibitor.
Fig. 5 is air curtain air brick structural representation in the utility model embodiment.
Fig. 6 is the structural representation on the second gear dam in the utility model embodiment, and wherein, A is the front view on the second gear dam, and B is the side view on the second gear dam.
In figure, 1. the first gear dam; 2. the second gear dam; 3. air curtain air brick; 4. turbulence inhibitor; 5. tundish permanent liner; 6. liner in dundish; 7. tundish upper nozzle; 8. the body on the first gear dam; 9. the first pod apertures; 10. turbulence inhibitor shell; 11. turbulence inhibitor cover cores; 12. turbulence inhibitor base plates; 13, air curtain air brick body; 14. air chambers; 15. sleeve pipes; 16. air inlet pipe; 17. jointings; The body on 18. second gear dams; 19. second pod apertures.
Detailed description of the invention
Below in conjunction with specific embodiments and the drawings, the utility model is described in further detail, but be not limited to this.
Embodiment 1
A kind of for removing the metallurgical device of molten steel field trash in double flow tray billet continuous casting machine tundish, structure is as shown in Fig. 1-Fig. 6, comprise the first gear dam 1, the second gear dam 2, air curtain air brick 3 and turbulence inhibitor 4, turbulence inhibitor 4 is arranged on the inner side of continuous casting of two strands in parallel machine tundish beam impact zone bag wall working lining, its longitudinal centre line overlaps with the center line of large bag long nozzle, and between two tundish upper nozzles, described air curtain air brick, the first gear dam 1, the second gear dam 2 is two, be symmetricly set on the both sides of turbulence inhibitor 4, air curtain air brick, the first gear dam 1, second gear dam 2 according to the order of sequence successively spaced and parallel be arranged between turbulence inhibitor 4 and one of them tundish upper nozzle 7, air curtain air brick 3 is between turbulence inhibitor 4 and the first gear dam 1, in the middle of being fixed at the bottom of handbag in permanent liner 5, and bottom is imbedded in tundish underwrite lining work 6, the horizontal range c of the longitudinal centre line of described air curtain air brick and turbulence inhibitor 4 is 750mm, the first gear dam, the bottom on the second gear dam be fixed in the middle of at the bottom of handbag in permanent liner 5, the first gear dam 1 is 250mm with the horizontal range b of air curtain air brick 3, the second gear dam 2 is 400mm with the horizontal range a of tundish upper nozzle 7, the height on described the first gear dam 1 is higher than the height on the second gear dam 2, the height H on described the first gear dam (1) is 650mm, be respectively arranged with the first pod apertures 9 at the two ends on the first gear dam 1, the first pod apertures 9 is from tilting obliquely gradually near laterally closer the second gear dam 5 one sides of air curtain air brick 3 one, and the center line of the first pod apertures 9 is 70 ° with the center line angle β of vertical gear dam body.The thickness L on the first gear dam 1 is 140mm, and the first pod apertures 9 on the first gear dam 1 lays respectively at 1/4 place, dam two ends, and the radius R of the first pod apertures 9 is 40mm.
The radius r that is symmetrically arranged with respectively two the second circular pod apertures 19, the second pod apertures 19 at the two ends of the second gear dam 2 bodies is 40mm, and the distance of the second pod apertures 19 center lines and continuous casting of two strands in parallel machine tundish underwrite lining work upper surface is 60mm.The height k on the second gear dam 2 is 300mm, and the thickness X on the second gear dam 2 is 160mm.
Turbulence inhibitor 4 is by turbulence inhibitor shell 10, turbulence inhibitor cover core 11, turbulence inhibitor base plate 12 assembles, on working face, smear anti-oxidant coating coating, 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.
Air curtain air brick 3 comprises air curtain air brick body 13, its profile is rectangle, in air curtain air brick body 13, be provided with circular air chamber 14, one end of air chamber 14 is set with sleeve pipe 15, in arranging on the port inner wall of sleeve pipe 15, connect silk, sleeve pipe 15 is connected with air inlet pipe 16 by the interior silk that connects, air inlet pipe 16 is communicated with in air chamber by sleeve pipe, the other end of air inlet pipe is connected with nipple 17, air inlet pipe is connected with external gas source by nipple 17, air curtain air brick body 13 is the magnesia air brick of diffusion-type, adopts prior art mechanical pressing.The height that the upper surface of air curtain air brick body 13 exceeds tundish underwrite lining work is 8mm.During the first gear dam 1, the second gear dam 2 are and adopt after castable moulding by casting, warm firing process is prepared from.
Embodiment 2,
For removing the metallurgical device of molten steel field trash in double flow tray billet continuous casting machine tundish, difference is as described in Example 1:
The horizontal range c of the longitudinal centre line of described air curtain air brick and turbulence inhibitor 4 is 600mm, the first gear dam 1 is 400mm with the horizontal range b of air curtain air brick 3, the second gear dam 2 is 600mm with the horizontal range a of tundish upper nozzle 7, the height on described the first gear dam 1 is higher than the height on the second gear dam 2, described the first gear dam) height H be 550mm; The center line of the first pod apertures 9 is 45 ° with the center line angle β of vertical gear dam body.The thickness L on the first gear dam 1 is 150mm, and the first pod apertures 9 on the first gear dam 1 lays respectively at 1/4 place, dam two ends, and the radius R of the first pod apertures 9 is 45mm.
The radius r that is symmetrically arranged with respectively two the second circular pod apertures 19, the second pod apertures 19 at the two ends of the second gear dam 2 bodies is 45mm, and the distance of the second pod apertures 19 center lines and continuous casting of two strands in parallel machine tundish underwrite lining work upper surface is 70mm.The height k on the second gear dam 2 is 250mm, and the thickness X on the second gear dam 2 is 150mm.
Embodiment 3,
For removing the metallurgical device of molten steel field trash in double flow tray billet continuous casting machine tundish, difference is as described in Example 1:
The horizontal range c of the longitudinal centre line of air curtain air brick and turbulence inhibitor 4 is 800mm, the first gear dam 1 is 200mm with the horizontal range b of air curtain air brick 3, the second gear dam 2 is 550mm with the horizontal range a of tundish upper nozzle 7, the height on described the first gear dam 1 is higher than the height on the second gear dam 2, and the height H on described the first gear dam is 550mm; The center line of the first pod apertures 9 is 55 ° with the center line angle β of vertical gear dam body.The thickness L on the first gear dam 1 is 130mm, and the first pod apertures 9 on the first gear dam 1 lays respectively at 1/4 place, dam two ends, and the radius R of the first pod apertures 9 is 35mm.
The radius r that is symmetrically arranged with respectively two the second circular pod apertures 19, the second pod apertures 19 at the two ends of the second gear dam 2 bodies is 35mm, and the distance of the second pod apertures 19 center lines and continuous casting of two strands in parallel machine tundish underwrite lining work upper surface is 55mm.The height k on the second gear dam 2 is 280mm, and the thickness X on the second gear dam 2 is 130mm.
Comparative example 1
For removing a metallurgical device for molten steel field trash in double flow tray billet continuous casting machine tundish, comprise gear dam, barricade and turbulence inhibitor, 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, gear dam, barricade is two, be symmetricly set on the both sides of turbulence inhibitor, barricade, gear dam according to the order of sequence successively spaced and parallel be arranged between turbulence inhibitor 4 and one of them tundish upper nozzle 7, barricade is fixed on middle handbag wall working lining, in the middle of gear dam is fixed at the bottom of handbag in permanent liner, and imbed in tundish underwrite lining work, gear dam and barricade are crisscross arranged up and down, the longitudinal centre line of turbulence inhibitor and the horizontal range of barricade are 750mm, the horizontal range of gear dam and barricade is 250mm, the height on gear dam is 350mm, gear dam is provided with two circular pod apertures that are arranged symmetrically with, the radius of pod apertures is 35mm.The height of barricade is 850～900mm.
Comparative example 2
A kind of for removing the metallurgical device of molten steel field trash in double flow tray billet continuous casting machine 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 two, two air curtain air bricks lay respectively between turbulence inhibitor and two filling pipe ends of tundish, symmetrical installation, in the middle of being fixed on, at the bottom of handbag in permanent liner, the level interval of the longitudinal centre line of described turbulence inhibitor and air curtain air brick 3 is 800mm.
Described air curtain air brick, comprise air curtain air brick body, its profile is rectangle, is provided with circular air chamber in air curtain air brick body, one end of air chamber is set with sleeve pipe, in arranging on the port inner wall of sleeve pipe, connect silk, described sleeve pipe is connected with air inlet pipe by the interior silk that connects, and air inlet pipe is communicated with in air chamber by sleeve pipe, the other end of air inlet pipe is connected with nipple, air inlet pipe is connected with source of the gas by nipple, and described air brick body is the magnesia air brick of diffusion-type, adopts prior art mechanical pressing.
Comparative example 3
For removing a device for molten steel field trash in double flow tray billet continuous casting machine tundish, comprise air curtain air brick, gear dam, barricade and turbulence inhibitor, 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, air curtain air brick, gear dam, barricade is two, be symmetricly set on the both sides of turbulence inhibitor 4, air curtain air brick, gear dam, barricade according to the order of sequence successively spaced and parallel be arranged between turbulence inhibitor 4 and one of them tundish upper nozzle, air curtain air brick is between turbulence inhibitor and barricade, in the middle of being fixed at the bottom of handbag in permanent liner, and bottom is imbedded in tundish underwrite lining work, gear dam barricade is crisscross arranged up and down, the longitudinal centre line of described turbulence inhibitor and the spacing of barricade are 650mm, the spacing of gear dam and barricade is 400mm, the spacing of air curtain air brick and tundish upper nozzle is 600mm.
Experimental example
To the device of molten steel field trash in the removal double flow tray billet continuous casting machine tundish of embodiment 1～3 and comparative example 1～3, on Laiwu steel enterprise Yin Shan shaped steel Co., Ltd steel mill double flow tray billet continuous casting machine tundish, apply comparative analysis, steel grade X80, 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, all do not detect that equivalent diameter is greater than the electrolysis field trash of 30 μ m, and in the continuous casting billet that comparative example 2 is produced, can detect that minority equivalent diameter is greater than the electrolysis field trash of 50 μ m, equivalent diameter all detects at comparative example 1-3 in the electrolysis field trash of 40～50 μ m in 30～40 μ m and equivalent diameter, and the amount of inclusions of equivalent diameter in 30～40 μ m be the amount of inclusions in 40～50 μ m more than equivalent diameter a little, 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 30 μ m obviously produces more than the utility model embodiment 1-3, and the device tundish of the utility model embodiment 1-3 company's time of watering is obviously longer than comparative example, and the regularly slagging of the device of the utility model embodiment 1-3, coverture can flow freely.
By the Data Comparison of table 1, application the utility model, the small the amount of inclusions that makes equivalent diameter in continuous casting billet be less than 50 μ m arranges turbulence inhibitor than using in double-current tundish, barricade, in the continuous casting billet that the device on the first gear dam and the second gear dam is produced, field trash reduces 45.5% on year-on-year basis, than turbulence inhibitor is set merely in double-current tundish, in the continuous casting billet that the device that air curtain is ventilative is produced, field trash reduces 20.1%, than being symmetrical arranged air curtain air brick in double-current tundish, gear dam, in the continuous casting billet that the device of barricade and turbulence inhibitor is produced, field trash reduces 29.4%, in tundish, barricade is not set simultaneously, artesian flow and the uniform fold of regular slagging operation and tundish covering flux are realized, make extend to 10～12 hours by 6～8 hours the service life of tundish.
Claims (10)
1. one kind for removing the metallurgical device of molten steel field trash in double flow tray billet continuous casting machine tundish, comprise the first gear dam (1), the second gear dam (2), air curtain air brick (3) and turbulence inhibitor (4), turbulence inhibitor (4) is arranged on the inner side of continuous casting of two strands in parallel machine tundish beam impact zone bag wall working lining, its longitudinal centre line overlaps with the center line of large bag long nozzle, and between two tundish upper nozzles, it is characterized in that, described air curtain air brick, the first gear dam (1), the second gear dam (2) is two, be symmetricly set on the both sides of turbulence inhibitor, air curtain air brick, the first gear dam (1), the second gear dam (2) successively spaced and parallel is arranged between turbulence inhibitor and one of them tundish upper nozzle, air curtain air brick (3) is positioned between turbulence inhibitor (4) and the first gear dam (1), in the middle of being fixed at the bottom of handbag in permanent liner (5), and bottom is imbedded in tundish underwrite lining work (6), the horizontal range c of the longitudinal centre line of described air curtain air brick and turbulence inhibitor (4) is 600～800mm, the first gear dam, the bottom on the second gear dam be fixed in the middle of at the bottom of handbag in permanent liner (5), the first gear dam (1) is 200～400mm with the horizontal range b of air curtain air brick, the second gear dam (2) is 400～600mm with the horizontal range a of tundish upper nozzle (7), the height on described the first gear dam is higher than the height on the second gear dam, be respectively arranged with the first pod apertures (9) at the two ends on the first gear dam, the center line of its first pod apertures (9) is 40 °～70 ° with the center line angle β of vertical the first gear dam body.
2. according to claim 1ly it is characterized in that for removing the metallurgical device of molten steel field trash in double flow tray billet continuous casting machine tundish, the height H on described the first gear dam (1) is 450～700mm.
3. according to claim 2ly it is characterized in that for removing the metallurgical device of molten steel field trash in double flow tray billet continuous casting machine tundish, the height H on described the first gear dam (1) is 550～600mm.
4. according to claim 1 for removing the metallurgical device of molten steel field trash in double flow tray billet continuous casting machine tundish, it is characterized in that, described air curtain air brick (3) is 650～750mm with the horizontal range c of the longitudinal centre line of turbulence inhibitor (4), the first gear dam (1) is 250～300mm with the horizontal range b of air curtain air brick (3), and the second gear dam (2) is 400～450mm with the horizontal range a of tundish upper nozzle (7); The first described pod apertures is from tilting obliquely gradually near laterally closer the second gear dam one side of air curtain air brick (3), and the center line of the first pod apertures (9) is 45 °～60 ° with the center line angle β of vertical the first gear dam body.
5. according to claim 1 for removing the metallurgical device of molten steel field trash in double flow tray billet continuous casting machine tundish, it is characterized in that, the thickness L on described the first gear dam (1) is 100～160mm, the first pod apertures on the first gear dam lays respectively at 1/4 place, dam two ends, and the radius R of the first pod apertures (9) is 35～45mm.
6. according to claim 1 for removing the metallurgical device of molten steel field trash in double flow tray billet continuous casting machine tundish, it is characterized in that, preferably, be symmetrically arranged with respectively two circle the second pod apertures (19) at the two ends of the second gear dam body, the radius r of the second pod apertures is 35～45mm, and the distance of the second pod apertures center line and continuous casting of two strands in parallel machine tundish underwrite lining work upper surface is 40～70mm.
7. according to claim 1 for removing the metallurgical device of molten steel field trash in double flow tray billet continuous casting machine tundish, it is characterized in that, the height k on described the second gear dam (2) is 250～350mm, and the thickness X on the second gear dam (2) is 120～180mm.
8. according to claim 1 for removing the metallurgical device of molten steel field trash in double flow tray billet continuous casting machine tundish, it is characterized in that, described turbulence inhibitor is by turbulence inhibitor shell (10), turbulence inhibitor cover core (11), turbulence inhibitor base plate (12) assembles, on working face, smear anti-oxidant coating coating, 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.
9. according to claim 1 for removing the metallurgical device of molten steel field trash in double flow tray billet continuous casting machine tundish, it is characterized in that, described air curtain air brick (3), comprise air curtain air brick body (13), its profile is rectangle, in air curtain air brick body (13), be provided with circular air chamber (14), one end of air chamber is set with sleeve pipe (15), in arranging on the port inner wall of sleeve pipe, connect silk, described sleeve pipe is connected with air inlet pipe (16) by the interior silk that connects, air inlet pipe is communicated with in air chamber by sleeve pipe, the other end of air inlet pipe is connected with nipple (17), air inlet pipe is connected with source of the gas by nipple, described air brick body is the magnesia air brick of diffusion-type, adopt prior art mechanical pressing.
10. according to claim 9 for removing the metallurgical device of molten steel field trash in double flow tray billet continuous casting machine tundish, it is characterized in that, the height that the upper surface of described air curtain air brick body exceeds tundish underwrite lining work is 5～10mm, and during the first gear dam, the second gear dam are and adopt after castable moulding by casting, warm firing process is prepared from.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420253573.0U CN203804184U (en) | 2014-05-16 | 2014-05-16 | Metallurgy device for removing molten steel inclusion in two-strand slab continuous casting machine tundish |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420253573.0U CN203804184U (en) | 2014-05-16 | 2014-05-16 | Metallurgy device for removing molten steel inclusion in two-strand slab continuous casting machine tundish |
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| CN203804184U true CN203804184U (en) | 2014-09-03 |
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| CN201420253573.0U Withdrawn - After Issue CN203804184U (en) | 2014-05-16 | 2014-05-16 | Metallurgy device for removing molten steel inclusion in two-strand slab continuous casting machine tundish |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103990772A (en) * | 2014-05-16 | 2014-08-20 | 莱芜钢铁集团有限公司 | Metallurgy device for removing molten steel slag inclusion in tundish of double-flow slab caster |
| CN110153402A (en) * | 2019-03-29 | 2019-08-23 | 山西太钢不锈钢股份有限公司 | Improve method and three stream T-type tundish that three stream T-type tundish respectively flow consistency |
-
2014
- 2014-05-16 CN CN201420253573.0U patent/CN203804184U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103990772A (en) * | 2014-05-16 | 2014-08-20 | 莱芜钢铁集团有限公司 | Metallurgy device for removing molten steel slag inclusion in tundish of double-flow slab caster |
| CN110153402A (en) * | 2019-03-29 | 2019-08-23 | 山西太钢不锈钢股份有限公司 | Improve method and three stream T-type tundish that three stream T-type tundish respectively flow consistency |
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