CN102728827B - Continuous casting tundish capable of improving molten steel cleanliness - Google Patents
Continuous casting tundish capable of improving molten steel cleanliness Download PDFInfo
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- CN102728827B CN102728827B CN201210254811.5A CN201210254811A CN102728827B CN 102728827 B CN102728827 B CN 102728827B CN 201210254811 A CN201210254811 A CN 201210254811A CN 102728827 B CN102728827 B CN 102728827B
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Abstract
The invention discloses a continuous casting tundish capable of improving molten steel cleanliness, which comprises a tundish body, a tundish sealing cover provided with a first opening where a ladle long nozzle passes, and a treater dividing the tundish body into an injection flow impact region and a casting region. The first opening is arranged in the injection flow impact region, the treater includes a lower barrier wall, a first and a second upper barrier wall are arranged at two sides of the lower barrier wall respectively, the first upper barrier wall and the lower barrier wall form a molten steel rise channel, the second upper barrier wall and the lower barrier wall form a molten steel descend channel, a second opening is formed between the upper ends of the first and the second upper barrier wall, a vacuum hood is arranged over the second opening, and an argon blowing device is arranged at the bottom of the tundish body and aligned with the rise channel. The inventive continuous casting tundish can fully remove inclusion and gas from molten steel, is high in molten steel yield, reduces metal loss and operation costs, and improves molten steel cleanliness and cast billet quality.
Description
Technical field
The present invention relates to the continuous casting installation for casting in metallurgy industry, refer to particularly a kind of continuous casting tundish that improves molten steel cleanness.
Background technology
At present, most iron and steel are all to manufacture continuous casting billet by conticaster, are then rolled processing.Continuous casting process flow process mainly comprises: after converter tapping; molten steel is through external refining; delivered to the bale panoramic tables of conticaster by large contracted affreightment; molten steel flows in tundish by protective casing from large bag; tundish flow in crystallizer by submersed nozzle; and condensation pull-out in crystallizer, produce continuous casting billet.
In casting process, because ladle beam speed is high, kinetic energy is large, enters after the impact zone of tundish, and height of formation turbulent region, causes tundish molten steel secondary oxidation and middle winding slag phenomenon.Tundish is in whole process, and main performance is following to be acted on:
(1) reduce molten steel static pressure, keep the stable molten steel liquid level of tundish, evenly molten steel is injected to crystallizer;
(2) molten steel stays for some time (as 5 ~ 10min) in tundish, is conducive to field trash in molten steel and drips floating with the slag of sneaking into, with cleaning molten steel;
(3) shunting molten steel.To multiple-strand caster, by tundish, molten steel is assigned to each crystallizer;
(4) storage molten steel.In the time that changing ladle, sequence casting do not subtract pulling rate, for sequence casting creates conditions.
Wherein, topmost effect is to remove field trash in molten steel, removes in molten steel the gases such as [O], [H].Existing tundish is for the better middle foreign material of molten steel of removing, and the measure of mainly taking has:
A, add covering slag at tundish molten steel liquid level, barricade be set in tundish, optimize molten steel flow, catch removal of inclusions by covering slag, because the inclusion floating time is longer, and molten steel again in tundish the time of staying shorter, so its metallurgical effect is limited.
B, in tundish, use ceramic filter, molten steel is filtered, this method can be removed the field trash that portion size is larger, still, uses after a period of time, and ceramic filter easily stops up, and does not reach on the contrary the effect of removal of inclusions.
C, be blown into inert gas at tundish, the bubble that inert gas generates makes the inclusion particle in molten steel mutually collide and grow up, increase the motion vertically upward of field trash, thereby reach the object of cleaning molten steel, the shortcoming of this processing method is that blowning installation impossible is installed in whole tundish bottom, Tundish is processed inhomogeneous, and in steel, gas clearance is not high.
Summary of the invention
Object of the present invention will overcome the existing deficiency of prior art exactly, and a kind of continuous casting tundish that improves molten steel cleanness is provided.
For achieving the above object, the continuous casting tundish of the designed raising molten steel cleanness of the present invention, comprise tundish inclusion and be arranged on the tundish seal cover on tundish inclusion, on described tundish seal cover, be provided with for large bag long nozzle through the first opening that enters tundish inclusion, it also comprises the processor that tundish inclusion is separated into beam impact zone and pouring area, described the first opening is arranged on beam impact zone, described processor comprises lower retaining wall, the both sides of described lower retaining wall are respectively arranged with the first top retaining wall and the second top retaining wall, described the first top retaining wall and lower retaining wall form the rising passway of molten steel, described the second top retaining wall and lower retaining wall form the decline passway of molten steel, the upper end of described the first top retaining wall and the second top retaining wall is all connected with tundish seal cover, gap is left in the bottom of the lower end of described the first top retaining wall and the second top retaining wall and tundish inclusion inner side, the bottom of the lower end of described lower retaining wall and tundish inclusion inner side is connected as a single entity, between the upper end of described lower retaining wall and tundish seal cover, leave gap, between described the first top retaining wall and the upper end of the second top retaining wall, form the second opening of tundish seal cover, on described the second opening, be provided with the vacuum (-tight) housing being connected with vavuum pump, the bottom alignment rising passway place of described tundish inclusion is provided with argon-blowing device.
In such scheme, described processor is provided with one, and tundish inclusion is divided into a beam impact zone and a pouring area by it, and described beam impact zone and pouring area are only communicated with by rising passway and the decline passway of processor.
Preferably, described processor is provided with multiple, and tundish inclusion is divided into a beam impact zone and multiple pouring area by it, and described beam impact zone and pouring area are only communicated with by rising passway and the decline passway of processor.
Like this, the molten steel that enters tundish inclusion beam impact zone must first rise by the rising passway of processor, carries out entering pouring area from decline passway after application of vacuum, and the molten steel 100% of all casting has all passed through processing, has improved the effect of tundish metallurgy.
In such scheme, described the first top retaining wall, the second top retaining wall and lower retaining wall are parallel to each other, and described the first top retaining wall and the second top retaining wall are separately positioned on lower retaining wall both sides 8 ~ 10 centimeters.
In such scheme, the lower end of described the first top retaining wall and the second top retaining wall and the bottom gap of tundish inclusion are 10 ~ 15 centimetres, the minimum constructive height of described lower retaining wall is 60 centimetres, and the maximum height of described lower retaining wall is less than the maximum height of molten steel liquid level in tundish inclusion.Two sides along its length of described the first top retaining wall, the second top retaining wall and lower retaining wall and the madial wall of tundish inclusion are connected as a single entity, 8 ~ 10 centimetres of the thickness of described the first top retaining wall, the second top retaining wall and lower retaining wall.
In such scheme, in described pouring area, be provided with Ba Heyan.Like this, set up the effect of Ba Heyan raising tundish metallurgy in pouring area.
In such scheme, described argon-blowing device comprises 6 ~ 8 argon gas paths, is arranged on tundish inclusion bottom along rising passway centerline direction.Like this, argon gas enters rising passway, forms a large amount of minute bubbles, cause molten steel density in rising passway to diminish, molten steel in tundish inclusion enters the top of processor by rising passway, make the molten steel in tundish inclusion all obtain Argon processing, improves gas clearance in steel.
In such scheme, described vacuum (-tight) housing is connected with the tundish seal cap sealing of the second opening part by bolt.Like this, vacuum (-tight) housing is connected with vavuum pump, for taking the argon gas overflowing away, and under vacuum (-tight) housing, causes suitable vacuum.
The optional fusing point of material of the first top retaining wall, the second top retaining wall and lower retaining wall is at the oxide of 2050 ~ 3050 DEG C, as aluminium oxide, lanthana, beryllium oxide, zirconia, magnesia etc.; Also can select fusing point is the infusible compound of 2000 ~ 3887 DEG C, as carbide (carborundum, titanium carbide, ramet etc.), nitride (boron nitride, silicon nitride etc.), boride (zirconium boride, titanium boride, hafnium boride etc.), silicide (molybdenum disilicide etc.) and sulfide (thorium sulfide, cerium sulphide etc.); Also can select high-temperature composite material, as cermet, high temperature inorganic coating and fiber reinforced ceramic etc.
Beneficial effect of the present invention is: Steel Melt for Continuous Casting enters after tundish, first rise by the rising passway of processor, molten steel is under low vacuum state, one side is carried out Argon processing, then enter pouring area from decline passway, can guarantee that the molten steel that all enters crystallizer, through processing, strengthens tundish metallurgy treatment effect.In molten steel after treatment, 35 ~ 50 μ m inclusion removal rates reach the above large inclusions major part of 65%, 50 μ m and are removed, and total oxygen content has reduced by 55%, and in steel, gas content reduces by 46%, and molten steel recovery rate is high, reduce metal loss.The present invention has avoided ladle beam to impact caused strong eddy current, prevent that turbulent diffusion from causing that surface wave is involved in molten steel inside bits, the field trash of effectively controlling in molten steel too much flows into crystallizer, reduces inclusion in casting blank, improve molten steel cleanness and slab quality, reduce operating cost.
Brief description of the drawings
Fig. 1 is the structural representation of a preferred embodiment of the present invention.
Fig. 2 is the plan structure schematic diagram of Fig. 1.
Fig. 3 is the structural representation of another preferred embodiment of the present invention.
Fig. 4 is the plan structure schematic diagram of Fig. 3.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Shown in Fig. 1 ~ 4, improve the continuous casting tundish of molten steel cleanness,
Comprise tundish inclusion 1 and be arranged on the tundish seal cover 2 on tundish inclusion 1, on tundish seal cover 2, being provided with for large bag long nozzle 3 through the first opening 4 that enters tundish inclusion 1.It also comprises that processor 5, the first openings 4 that tundish inclusion 1 is separated into beam impact zone 1.1 and pouring area 1.2 are arranged on beam impact zone 1.1.Processor 5 comprises lower retaining wall 11, and the both sides of lower retaining wall 11 are respectively arranged with the first top retaining wall 12 and the second top retaining wall 13.The first top retaining wall 12 and lower retaining wall 11 form the rising passway 6 of molten steel, the second top retaining wall 13 and lower retaining wall 11 form the decline passway 10 of molten steel, the upper end of the first top retaining wall 12 and the second top retaining wall 13 is all connected with tundish seal cover 2, gap is left in the bottom of the lower end of the first top retaining wall 12 and the second top retaining wall 13 and tundish inclusion 1 inner side, the bottom of the lower end of lower retaining wall 11 and tundish inclusion 1 inner side is connected as a single entity, between the upper end of lower retaining wall 11 and tundish seal cover 2, leave gap, between the first top retaining wall 12 and the upper end of the second top retaining wall 13, form the second opening 9 of tundish seal cover 2, on the second opening 9, be provided with the vacuum (-tight) housing 7 being connected with vavuum pump, bottom alignment rising passway 6 places of tundish inclusion 1 are provided with argon-blowing device 8.
The first top retaining wall 12, the second top retaining wall 13 and lower retaining wall 11 are parallel to each other, and the first top retaining wall 12 and the second top retaining wall 13 are separately positioned on lower retaining wall 6.2 both sides 8 ~ 10 centimeters.The lower end of the first top retaining wall 12 and the second top retaining wall 13 and the bottom gap of tundish inclusion 1 are 10 ~ 15 centimetres, and the minimum constructive height of lower retaining wall 11 is 60 centimetres, and the maximum height of lower retaining wall 11 is less than the maximum height of molten steel liquid level in tundish inclusion 1.Two sides along its length of the first top retaining wall 12, the second top retaining wall 13 and lower retaining wall 11 and the madial wall of tundish inclusion 1 are connected as a single entity, 8 ~ 10 centimetres of the thickness of the first top retaining wall 12, the second top retaining wall 13 and lower retaining wall 11.Argon-blowing device 8 comprises 6 ~ 8 argon gas paths, is arranged on tundish inclusion 1 bottom along rising passway 6 centerline directions.Vacuum (-tight) housing 7 is tightly connected by the tundish seal cover 2 at bolt and the second opening 9 places.
Embodiment 1
As shown in Figure 1, 2, tundish inclusion 1 is provided with a processor 5, and tundish inclusion 1 is divided into a beam impact zone 1.1 and a pouring area 1.2, and beam impact zone 1.1 and pouring area 1.2 are only communicated with by rising passway 6 and the decline passway 10 of processor 5.
Embodiment 2
As shown in Figure 3,4, tundish inclusion 1 is provided with two processors 5, and tundish inclusion 1 is divided into a beam impact zone 1.1 and two pouring areas 1.2.Each processor 5 comprises a lower retaining wall 11, vacuum (-tight) housing 7 and argon-blowing device 8, and the both sides of every lower retaining wall 11 are respectively arranged with the first top retaining wall 12 and the second top retaining wall 13.Rising passway 6, the second top retaining walls 13 that the first top retaining wall 12 and relative lower retaining wall 11 form molten steel and relative lower retaining wall 11 form the decline passway 10 of molten steel.Beam impact zone 1.1 and pouring area 1.2 are only communicated with by rising passway 6 and the decline passway 10 of processor 5.
The continuous casting tundish that adopts embodiment 1 or 2 to provide is processed molten steel in ladle:
Before conticaster leaves and waters, vacuum (-tight) housing 7 is connected with vacuum extractor, argon-blowing device 8 is to middle handbag body 1 blowing argon gas, blow 5 minutes by 5 NL/Min flows, by Bas Discharged in tundish inclusion 1, and be full of argon gas, prevent when molten steel from injecting tundish inclusion 1 oxidized.
By wrapping greatly beam impact zone 1.1 centerings of long nozzle 3 with tundish inclusion 1, open slide gate nozzle, molten steel flows into beam impact zone 1.1 from large bag.The height of tundish inclusion 1 is 80 ~ 120 centimetres.In the time that the degree of depth of molten steel in beam impact zone 1.1 reaches the half height of tundish inclusion 1, the argon-blowing device 8 of tundish inclusion 1 bottom strengthens Argon amount, and each Access flow is supplied gas by 120NL/Min, pressure 0.2MPa.
Argon gas out enters rising passway 6 from argon-blowing device 8, produce a large amount of minute bubbles, cause molten steel density in rising passway 6 to diminish, molten steel enters vacuum (-tight) housing 7 bottoms with Argon Bubble through rising passway 6, opens vavuum pump, vavuum pump rate of air sucked in required is argon flow amount 1.5 times, produce vacuum in vacuum (-tight) housing 7 bottoms, under Argon Bubble and micro-suction function, molten steel carries out for 7 times, after application of vacuum, entering pouring area 1.2 through decline passway 10 at vacuum (-tight) housing.In this process, molten steel is by application of vacuum and Argon processing, removal of inclusions, removes gas, and the molten steel 100% of all casting has all passed through processing, has improved the effect of tundish metallurgy.
Claims (10)
1. a processing method of utilizing continuous casting tundish to improve molten steel cleanness, described continuous casting tundish comprises tundish inclusion (1) and is arranged on the tundish seal cover (2) on tundish inclusion (1), on described tundish seal cover (2), be provided with for large bag long nozzle (3) through the first opening (4) that enters tundish inclusion (1), it is characterized in that: described continuous casting tundish also comprises the processor (5) that tundish inclusion (1) is separated into beam impact zone (1.1) and pouring area (1.2), described the first opening (4) is arranged on beam impact zone (1.1), described processor (5) comprises lower retaining wall (11), the both sides of described lower retaining wall (11) are respectively arranged with the first top retaining wall (12) and the second top retaining wall (13), described the first top retaining wall (12), the second top retaining wall (13) and lower retaining wall (11) are parallel to each other, described the first top retaining wall (12), two sides along its length of the second top retaining wall (13) and lower retaining wall (11) and the madial wall of tundish inclusion (1) are connected as a single entity, described the first top retaining wall (12) and lower retaining wall (11) form the rising passway (6) of molten steel, described the second top retaining wall (13) and lower retaining wall (11) form the decline passway (10) of molten steel, the upper end of described the first top retaining wall (12) and the second top retaining wall (13) is all connected with tundish seal cover (2), gap is left in the bottom of the lower end of described the first top retaining wall (12) and the second top retaining wall (13) and tundish inclusion (1) inner side, the bottom of the lower end of described lower retaining wall (11) and tundish inclusion (1) inner side is connected as a single entity, between the upper end of described lower retaining wall (11) and tundish seal cover (2), leave gap, between the upper end of described the first top retaining wall (12) and the second top retaining wall (13), form second opening (9) of tundish seal cover (2), on described the second opening (9), be provided with the vacuum (-tight) housing (7) being connected with vavuum pump, the bottom alignment rising passway (6) of described tundish inclusion (1) locates to be provided with argon-blowing device (8), adopt the concrete steps of described continuous casting tundish processing molten steel as follows:
Before conticaster leaves and waters, vacuum (-tight) housing (7) is connected with vacuum extractor, argon-blowing device (8) is to middle handbag body (1) blowing argon gas, blow 5 minutes by 5NL/Min flow, by Bas Discharged in tundish inclusion (1), and be full of argon gas, prevent when molten steel from injecting tundish inclusion (1) oxidized;
To wrap greatly beam impact zone (1.1) centering of long nozzle (3) and tundish inclusion (1), open slide gate nozzle, molten steel flows into beam impact zone (1.1) from large bag, the height of tundish inclusion (1) is 80～120 centimetres, in the time that the degree of depth of molten steel in beam impact zone (1.1) reaches the half height of tundish inclusion 1, the argon-blowing device (8) of tundish inclusion (1) bottom strengthens Argon amount, each Access flow is supplied gas by 120NL/Min, pressure 0.2MPa;
Argon gas out enters rising passway (6) from argon-blowing device (8), produce a large amount of minute bubbles, cause molten steel density in rising passway (6) to diminish, molten steel enters vacuum (-tight) housing (7) bottom with Argon Bubble through rising passway (6), open vavuum pump, vavuum pump rate of air sucked in required is 1.5 times of argon flow amount, produce vacuum in vacuum (-tight) housing (7) bottom, under Argon Bubble and micro-suction function, molten steel carries out after application of vacuum under vacuum (-tight) housing (7), enter pouring area (1.2) through decline passway (10), molten steel is by application of vacuum and Argon processing, removal of inclusions, remove gas, improve molten steel cleanness.
2. the processing method of utilizing continuous casting tundish to improve molten steel cleanness according to claim 1, it is characterized in that: described processor (5) is provided with one, tundish inclusion (1) is divided into a beam impact zone (1.1) and a pouring area (1.2) by it, and described beam impact zone (1.1) and pouring area (1.2) are only communicated with by rising passway (6) and the decline passway (10) of processor (5).
3. the processing method of utilizing continuous casting tundish to improve molten steel cleanness according to claim 1, it is characterized in that: described processor (5) is provided with multiple, tundish inclusion (1) is divided into a beam impact zone (1.1) and multiple pouring area (1.2) by it, and described beam impact zone (1.1) and pouring area (1.2) are only communicated with by rising passway (6) and the decline passway (10) of processor (5).
4. improve the processing method of molten steel cleanness according to the continuous casting tundish that utilizes described in claim 1 or 2 or 3, it is characterized in that: described the first top retaining wall (12) and the second top retaining wall (13) are separately positioned on lower retaining wall (11) both sides 8～10 centimeters.
5. the processing method of utilizing continuous casting tundish to improve molten steel cleanness according to claim 4, it is characterized in that: the lower end of described the first top retaining wall (12) and the second top retaining wall (13) and the bottom gap of tundish inclusion (1) are 10～15 centimetres, the minimum constructive height of described lower retaining wall (11) is 60 centimetres, and the maximum height of described lower retaining wall (11) is less than the maximum height of molten steel liquid level in tundish inclusion (1).
6. the processing method of utilizing continuous casting tundish to improve molten steel cleanness according to claim 4, is characterized in that: 8～10 centimetres of the thickness of described the first top retaining wall (12), the second top retaining wall (13) and lower retaining wall (11).
7. the processing method of utilizing continuous casting tundish to improve molten steel cleanness according to claim 5, is characterized in that: 8～10 centimetres of the thickness of described the first top retaining wall (12), the second top retaining wall (13) and lower retaining wall (11).
8. improve the processing method of molten steel cleanness according to the continuous casting tundish that utilizes described in claim 1 or 2 or 3, it is characterized in that: in described pouring area (1.2), be provided with dam (14) and weir (15).
9. improve the processing method of molten steel cleanness according to the continuous casting tundish that utilizes described in claim 1 or 2 or 3, it is characterized in that: described argon-blowing device (8) comprises 6～8 argon gas paths, be arranged on tundish inclusion (1) bottom along rising passway (6) centerline direction.
10. improve the processing method of molten steel cleanness according to the continuous casting tundish that utilizes described in claim 1 or 2 or 3, it is characterized in that: the tundish seal cover (2) that described vacuum (-tight) housing (7) is located by bolt and the second opening (9) is tightly connected.
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| CN103862013B (en) * | 2014-03-25 | 2016-02-17 | 莱芜钢铁集团有限公司 | A kind of refining cover for continuous casting production and preparation method thereof |
| KR101881971B1 (en) * | 2016-11-09 | 2018-08-24 | 주식회사 포스코 | Casting apparatus and casging method using the same |
| KR101949698B1 (en) | 2017-07-14 | 2019-02-19 | 주식회사 포스코 | Apparatus for treatment molten material |
| CN107983944B (en) * | 2018-01-13 | 2023-06-30 | 山东钢铁股份有限公司 | Method and device for reducing molten steel casting allowance in continuous casting process |
| CN108380848B (en) * | 2018-06-01 | 2019-12-10 | 南京沃特电机有限公司 | application method of tundish with double-layer annular slag dam for vacuum ingot casting |
| CN110776322B (en) * | 2019-11-26 | 2022-05-03 | 滁州学院 | Carbon-free composite ceramic submersed nozzle material and preparation method thereof |
| CN114477972A (en) * | 2021-12-30 | 2022-05-13 | 江苏新时高温材料股份有限公司 | Large-granularity plate-shaped corundum for large-sized ladle castable |
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