CN102909333B - Method and device for deceasing transverse corner cracks of casting blanks - Google Patents
Method and device for deceasing transverse corner cracks of casting blanks Download PDFInfo
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- CN102909333B CN102909333B CN201210405620.4A CN201210405620A CN102909333B CN 102909333 B CN102909333 B CN 102909333B CN 201210405620 A CN201210405620 A CN 201210405620A CN 102909333 B CN102909333 B CN 102909333B
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Abstract
The invention relates to a method and device for decreasing transverse corner cracks of castling blanks. The method includes the steps of S1, disposing a smoke hood above a conveying roller way for cut casting blanks to collect high-temperature air; S2, delivering the collected high-temperature air under pressure; S3, delivering the high-temperature air to air nozzles disposed in a second casting blank cooling area and at corners of the casting blanks; and S4, allowing the high-temperature air to pass through the air nozzles to cover the corners of the casting blanks. The device comprises the smoke cover (3), a first heat-resistant pipe (4), a booster fan (5), a second heat-resistant pipe (6), heat-resistant branch pipes (7) and the air nozzles (8). The high-temperature compressed air can be blown to the corners of the casting blanks to prevent excessively fast cooling of the corners of the casting blanks, so that the corners of the casting blanks can be kept at the temperature higher than the upper limit of a low-temperature brittleness area before entering a straightening area, precipitation of various carbo-nitrides from the corners of the casting blanks is avoided, corner plasticity of the casting blanks is improved and transverse cracking of the corners of the casting blanks is effectively prevented during straightening.
Description
Technical field
The present invention relates to the continuous casting technical field of steel, more particularly, relate to a kind of method and apparatus reducing strand transverse corner crack line.
Background technology
The continuous pouring process of steel is under a kind of continuous state, molten steel constantly transmits and release heat, and be frozen into the technical process of definite shape strand gradually, in the process, strand will through crystallizer (also known as a cold-zone), two cold-zones and three, air cooling zone cooled region, wherein, two cold-zones are made up of multiple cooling segmentation with different injection flow rate, casting billet surface is directly sprayed water or aerosol cools, larger thermograde can be there is in base shell, and, also to carry out bending and aligning to strand in two cold-zones, strand can be caused to produce mechanical stress and distortion, therefore, once the temperatures at localized regions of strand controls unreasonable, strand will produce mass defect because plasticity is poor.
In the cooling procedure of strand, strand folding corner region can be subject to the cooling in two faces, therefore the temperature of folding corner region will lower than the temperature at other position, in the aligning district of two cold-zones, the bight temperature of strand is easy to the black brittleness district being in 700-900 DEG C, this temperature range has the carboritrides such as a large amount of AlN, TiN, NbC to separate out at intergranular, thus reduces the plasticity in strand bight, makes strand in straightening process, produce transverse corner crack line.Particularly along with the continuous increase of microalloy element addition in steel, strand bight is more at the interval microalloying compound of separating out of aligning, and the plasticity in strand bight is poorer, also just more easily produces transverse corner crack line.When certain large-scale steel mill domestic produces the cut deal of micro alloyed steel, be almost 100% strand bight is cleared up, average day cleaning strand about 300 pieces, directly minimizing recovery rate of iron more than 5%.The existence of transverse corner crack line, not only increase slab degradation and learies, more seriously, can cause steel plate edge tissue abnormalities, compactness is poor, and impact flexibility, intensity reduce.
Under prior art, solve strand transverse corner crack and mainly contain two kinds of thinkings: a kind of method is in bending or aligning region, improve the surface temperature of strand, make it higher than the temperature 700-900 DEG C of upper limit in fragility trough district, avoid the precipitation of carbonitride, improve the plasticity of strand, but, because bight is in supercooled state, temperature lowest part is lower than strand central temperature more than 200 DEG C, therefore under existing two cool conditions, may make hardly strand bight align district time temperature all higher than 900 DEG C, so, even if employing said method, strand is carried out weak cold in two cold-zones, the transverse corner crack line of strand is also difficult to obtain large improvement, the chink ubiquitous persistent ailment especially of micro alloyed steel, and, if slab cooling is excessively weak, for ensureing that strand solidifies before cutting completely, Casting speed will be restricted, be unfavorable for the raising of continuous casting productivity ratio, second method reduces the surface temperature of strand, it is made to bend or align the lower limit of region lower than fragility trough district temperature 700-900 DEG C, the same like this plasticity that can improve strand, but, intensity of cooling can be strengthened like this, the comparatively responsive steel grade of crackle is made to crack defect because of chilling shrinkage stress, and be not suitable for the crack sensitivity steel grades such as micro alloyed steel therefore, simultaneously, due to strand final temperature can be made so lower, waste a large amount of thermal resources, be unfavorable for the hot-loading and hot-conveying of strand, therefore, this process route uses seldom in real process.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of method and apparatus that can reduce strand transverse corner crack line.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of method reducing strand transverse corner crack line, comprise the following steps:
S1, arranges petticoat pipe above the rollgang of strand after dicing, collects high temperature air by petticoat pipe;
S2, the high temperature air that pressurized delivered is collected;
S3, is delivered to high temperature air and is positioned at strand two cold-zone and the gas nozzle being arranged in the bight of strand;
S4, high temperature air covers the bight of strand by gas nozzle.
Present invention also offers a kind of device reducing strand transverse corner crack line, comprise petticoat pipe, the first heat-resisting pipeline, booster fan, the second heat-resisting pipeline, the gentle body nozzle of resistance to hot leg pipe, described petticoat pipe is arranged on the top of the rollgang for transmitting the rear strand of cutting, described first heat-resisting pipeline connects described petticoat pipe and described booster fan, described second heat-resisting pipeline connects described booster fan and described resistance to hot leg pipe, described gas nozzle is connected with described resistance to hot leg pipe, and described gas nozzle is arranged on the bight of two cold-zone strands.
In the device of above-mentioned minimizing strand transverse corner crack line, described petticoat pipe is provided with opening in the both sides vertical with rollgang.
In the device of above-mentioned minimizing strand transverse corner crack line, inside described petticoat pipe, be provided with insulating inner lining.
In the device of above-mentioned minimizing strand transverse corner crack line, the outer wall of described first heat-resisting pipeline and described second heat-resisting pipeline is provided with heat-insulation layer.
In the device of above-mentioned minimizing strand transverse corner crack line, described heat-insulation layer is resistance to guncotton.
In the device of above-mentioned minimizing strand transverse corner crack line, described gas nozzle is pancake.
In the device of above-mentioned minimizing strand transverse corner crack line, the jet area part of two adjacent described gas nozzles is overlapping.
In the device of above-mentioned minimizing strand transverse corner crack line, described gas nozzle is fixed on and is positioned on the cold pouring frame of two cold-zones.
Implement the method and apparatus of minimizing strand transverse corner crack line of the present invention, there is following beneficial effect:
(1) too fast by preventing strand bight from cooling to strand bight winding-up high temperature compressed air, make strand bight can be in more than the temperature upper limit in black brittleness district before aligning district, strand bight is avoided to separate out various carboritride, improve strand bight plasticity, effectively prevent strand bight from straightening process, producing transverse crack;
(2) by the water smoke of splash in two cold-zone spraying cooling processes being avoided to cool the pressure in strand bight to strand bight winding-up high temperature compressed air, effectively prevent the too fast cooling in strand bight, also prevent the too fast oxidation in strand bight;
(3) the present embodiment can effectively prevent strand bight excessively cold, improves strand transverse temperature uniformity and uniform texture, is conducive to the improvement of mechanical property after strand rolling;
(4) collect the sensible heat in strand transport process by petticoat pipe, the thermal pollution that strand sensible heat causes surrounding environment can be reduced, reduce workshop temperature, improve the working environment of workman.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation that the present invention reduces the device of strand transverse corner crack line;
Fig. 2 is the schematic diagram in the jet region of gas nozzle;
Fig. 3 is the temperature distribution history that before and after the invention process, wide of strand is surperficial.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but do not limit the present invention.
The invention provides a kind of method reducing strand transverse corner crack line, comprise the following steps:
S 1, arranges petticoat pipe above the rollgang of strand after dicing, collects high temperature air by petticoat pipe.After the cutting of red heat, strand can discharge a large amount of sensible heats in the process of transport, the air of circumference, collects the sensible heat in strand transport process by petticoat pipe, can reduce the thermal pollution that strand sensible heat causes surrounding, reduce workshop temperature, improve the working environment of workman.
S2, the high temperature air that pressurized delivered is collected.Can be pressurizeed to the high temperature air collected by booster fan and heat-resisting pipeline, and transmit.
S3, is delivered to high temperature air and is positioned at strand two cold-zone and the gas nozzle being arranged in the bight of strand.Gas nozzle can arrange multiple.
S4, high temperature air covers the bight of strand by gas nozzle, can prevent strand bight from cooling too fast, make strand bight can be in more than the temperature upper limit in black brittleness district before aligning district, strand bight is avoided to separate out various carboritride, improve strand bight plasticity, effectively prevent strand bight from straightening process, producing transverse crack.
As Figure 1-Figure 2, present invention also offers a kind of device reducing strand transverse corner crack line, mainly comprise the heat-resisting pipeline 4 of petticoat pipe 3, first, the heat-resisting pipeline 5 of booster fan 5, second, resistance to hot leg pipe 7 and gas nozzle 8.Above the rollgang 2 of the fixing strand 1 after dicing of petticoat pipe 3, petticoat pipe 3 is provided with opening in the both sides vertical with rollgang 2, so that strand 1 is come in and gone out from rollgang 2 after cutting, other side of petticoat pipe 3 and end face are closed, to collect the sensible heat of strand as far as possible.Petticoat pipe 3 can adopt metal material, and inner side is provided with the liner that heat-barrier material is made, to avoid thermal loss.The length of petticoat pipe 3 is depending on the length of rollgang in real process 2, and generally 2-4m shorter in rollgang 2, the height of petticoat pipe 3 is generally than the upper surface height 200-1000mm of strand 1 after cutting on rollgang 2.First heat-resisting pipeline 4 can be seamless connection with the center, top of petticoat pipe 3, and is connected with the inside of petticoat pipe 3.The other end of the first heat-resisting pipeline 4 is connected with booster fan 5, requires that booster fan 5 can extract the high temperature air in petticoat pipe 3, and carries after being pressurizeed.Booster fan 5 connects the total pipeline of conveying high temperature compressed air after the heat-resisting pipeline 5 of the second heat-resisting pipeline 5, second is booster fan 5.First heat-resisting pipeline 4 and the second heat-resisting pipeline 5 can be made by heat resisting steel, and outer wall all wraps up heat-insulation layer and carries out heat-insulation and heat-preservation, and to reduce the thermal loss in high temperature air transmitting procedure as far as possible, heat-insulation layer can be the insulation materials such as resistance to guncotton.In the present embodiment, the diameter of the first heat-resisting pipeline 4 is 200-800mm, and the diameter of the second heat-resisting pipeline 5 is 100-500mm.Second heat-resisting pipeline 5 is connected with resistance to hot leg pipe 7, and the other end of resistance to hot leg pipe 7 is connected with gas nozzle 8, and its effect carries the high temperature compressed air of coming to branch to each gas nozzle 8 in second heat-resisting pipeline 5.The material of resistance to hot leg pipe 7 with can be identical with the first heat-resisting pipeline 4, in the present embodiment, diameter is 5-30mm.As a kind of preferred structure, gas nozzle 8 exports as platypelloid type, and the gas overlay area sprayed should be thin-and-long, ensures that gas uniform covers strand bight 10.In prior art, two cold-zones all can arrange spraying rack, and this is the technology of the also extensive use of existing maturation, and gas nozzle 8 can be fixed on the spraying rack of two cold-zones.Gas nozzle 8 is arranged in the strand bight 10 of two cold-zone strands 9, require all strand bights 10 in more than the aligning district, covering two cold-zone of the gas uniform that gas nozzle 8 sprays, for making gas be uniformly distributed on strand bight 10 as far as possible, the overlapping interval that the edge that adjacent gas nozzle 8 sprays gas overlay area has 5-20mm wide.
In casting process, when after cutting, strand 1 to run and through the below of petticoat pipe 3 at rollgang 2, the sensible heat that large quantity of air in petticoat pipe 3 is cut rear strand 1 heats, high temperature air after heating flows out under the swabbing action of booster fan 5 in first of petticoat pipe 3 top center the heat-resisting pipeline 4, and becomes high temperature compressed air under the effect of booster fan 5.High temperature compressed air flows out from the second heat-resisting pipeline 5, and be dispensed in each resistance to hot leg pipe 7, high temperature compressed air in resistance to hot leg pipe 7 is sprayed by the gas nozzle 8 be connected with resistance to hot leg pipe 7, by reasonable Arrangement gas nozzle 8, high temperature compressed air can be made completely to be distributed on four strand bights 10 of two cold-zone strands 9 uniformly, so both there is certain concurrent heating effect to strand bight 10, strand bight 10 can be avoided again to be forced cooling by the water smoke of two cold-zone splashes simultaneously, thus cold problem is crossed in the bight effectively alleviating strand, prevent the formation of strand bight 10 transverse crack.
As shown in Figure 3, under identical cooling condition, after enforcement the present invention reduces the method and apparatus of strand transverse corner crack line, the temperature in the strand bight 10 of two cold-zone strands 9 is the highest approximately can improve 200 DEG C, the temperature in strand bight 10 is made to be in more than the temperature upper limit in 700-900 DEG C, black brittleness district, effectively avoid strand bight 10 cold and separate out various carbonitride because crossing, thus significantly alleviate strand bight 10 in straightening process, produce transverse crack defect.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (7)
1. reduce a method for strand transverse corner crack line, it is characterized in that, comprise the following steps:
S1, arranges petticoat pipe above the rollgang of strand after dicing, collects high temperature air by petticoat pipe;
S2, the high temperature air that pressurized delivered is collected;
S3, is delivered to high temperature air and is positioned at strand two cold-zone and the gas nozzle being arranged in the bight of strand;
S4, high temperature air covers the bight of strand by gas nozzle, makes the temperature in strand bight be in more than the temperature upper limit in 700-900 DEG C, black brittleness district.
2. one kind is reduced the device of strand transverse corner crack line, it is characterized in that, comprise petticoat pipe (3), first heat-resisting pipeline (4), booster fan (5), second heat-resisting pipeline (6), resistance to hot leg pipe (7) and gas nozzle (8), described petticoat pipe (3) is arranged on the top of the rollgang (2) for transmitting the rear strand (1) of cutting, described first heat-resisting pipeline (4) connects described petticoat pipe (3) and described booster fan (5), described second heat-resisting pipeline (6) connects described booster fan (5) and described resistance to hot leg pipe (7), described gas nozzle (8) is connected with described resistance to hot leg pipe (7), described gas nozzle (8) is arranged on the bight (10) of two cold-zone strands (9), the gas that described gas nozzle (8) sprays is HTHP air, described petticoat pipe (3) is provided with opening in the both sides vertical with rollgang (2), described petticoat pipe (3) inner side is provided with insulating inner lining.
3. the device of minimizing strand transverse corner crack line according to claim 2, is characterized in that, the outer wall of described first heat-resisting pipeline (4) and described second heat-resisting pipeline (6) is provided with heat-insulation layer.
4. the device of minimizing strand transverse corner crack line according to claim 3, it is characterized in that, described heat-insulation layer is resistance to guncotton.
5. the device of minimizing strand transverse corner crack line according to claim 2, it is characterized in that, described gas nozzle (8) is pancake.
6. the device of minimizing strand transverse corner crack line according to claim 2, is characterized in that, the jet area part of two adjacent described gas nozzles (8) is overlapping.
7. the device of minimizing strand transverse corner crack line according to claim 2, is characterized in that, it is characterized in that, described gas nozzle (8) is fixed on and is positioned on the cold pouring frame of two cold-zones.
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| CN201210405620.4A CN102909333B (en) | 2012-10-23 | 2012-10-23 | Method and device for deceasing transverse corner cracks of casting blanks |
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| CN201210405620.4A CN102909333B (en) | 2012-10-23 | 2012-10-23 | Method and device for deceasing transverse corner cracks of casting blanks |
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| CN102909333A CN102909333A (en) | 2013-02-06 |
| CN102909333B true CN102909333B (en) | 2015-04-15 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107287487A (en) * | 2016-03-31 | 2017-10-24 | 上海梅山钢铁股份有限公司 | J55 rank micro alloyed steels angle transverse fissure solution |
| CN106735035B (en) * | 2017-01-12 | 2019-07-02 | 首钢集团有限公司 | A method of reducing slab crackle |
| CN107598112A (en) * | 2017-10-30 | 2018-01-19 | 中冶赛迪工程技术股份有限公司 | A kind of secondary cooling water of continuous casting spraying width control device and method |
| CN107983926A (en) * | 2017-12-29 | 2018-05-04 | 南京钢铁股份有限公司 | A kind of billet caster di-cold spray nozzle and its method for arranging |
| CN109093087B (en) * | 2018-09-29 | 2020-07-07 | 东北大学 | Casting blank corner heating method |
| CN110918917A (en) * | 2019-11-18 | 2020-03-27 | 张家港宏昌钢板有限公司 | Continuous casting secondary cooling water system |
| CN111036869A (en) * | 2019-12-30 | 2020-04-21 | 西南铝业（集团）有限责任公司 | Casting process and casting system |
| CN112974748A (en) * | 2021-02-05 | 2021-06-18 | 鞍钢集团北京研究院有限公司 | Continuous casting machine with corner crack prevention function and continuous casting method |
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| CN102380597A (en) * | 2011-10-28 | 2012-03-21 | 中冶赛迪工程技术股份有限公司 | Method for controlling secondary cooling water spraying width during continuous casting of plate blank |
| CN202877504U (en) * | 2012-10-23 | 2013-04-17 | 中冶南方工程技术有限公司 | Device capable of reducing transverse crack of casting blank angle portion |
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| JPS5617171A (en) * | 1979-07-19 | 1981-02-18 | Nippon Steel Corp | Cooling method of continuously cast ingot |
| JPS6178544A (en) * | 1984-09-26 | 1986-04-22 | Kawasaki Steel Corp | Preventive method of overcooling of steel ingot |
| JP3117337B2 (en) * | 1993-09-24 | 2000-12-11 | 三菱重工業株式会社 | Spray cooling mold equipment for continuous casting |
| CN101443144A (en) * | 2006-05-16 | 2009-05-27 | Sms迪马格股份公司 | Method and strand-guiding device for guiding a cast strand |
| JP2010069496A (en) * | 2008-09-17 | 2010-04-02 | Kobe Steel Ltd | Secondary cooling apparatus and method in continuous casting |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102380597A (en) * | 2011-10-28 | 2012-03-21 | 中冶赛迪工程技术股份有限公司 | Method for controlling secondary cooling water spraying width during continuous casting of plate blank |
| CN202877504U (en) * | 2012-10-23 | 2013-04-17 | 中冶南方工程技术有限公司 | Device capable of reducing transverse crack of casting blank angle portion |
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