CN108356242B - Micro-alloy steel sheet billet corner crack control equipment and process - Google Patents
Micro-alloy steel sheet billet corner crack control equipment and process Download PDFInfo
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- CN108356242B CN108356242B CN201810329636.9A CN201810329636A CN108356242B CN 108356242 B CN108356242 B CN 108356242B CN 201810329636 A CN201810329636 A CN 201810329636A CN 108356242 B CN108356242 B CN 108356242B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/0408—Moulds for casting thin slabs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/055—Cooling the moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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Abstract
The invention provides a device and a process for controlling corner cracks of a microalloyed steel sheet billet, and relates to the technical field of continuous casting and rolling of steel sheet billets. The control equipment comprises a secondary cooling water distribution system, a corner efficient heat transfer narrow-surface Gaussian concave curved surface crystallizer and a newly-enhanced spraying system in a narrow-surface foot roll area of the crystallizer, wherein the newly-enhanced spraying system comprises a newly-added water supply pipeline, a newly-enhanced spraying frame and a water distribution control system. In the control process, dynamic water distribution is carried out by adopting a corner high-efficiency heat transfer narrow-surface Gaussian concave curved surface crystallizer, an overall enhanced cooling process, a water distribution process of a new enhanced spraying system in a narrow-surface foot roller area of the crystallizer and a wide-surface overall slow cooling water distribution process. The invention can stably realize the dispersion and precipitation of the microalloy carbonitride of the edge and corner part structure of the casting blank, strengthen the edge and corner part structure of the casting blank by self, promote the narrow-surface metal to flow to the side arc in the large deformation reduction process of the liquid core of the casting blank, reduce the stress of the edge and corner part of the casting blank, and control the edge and corner part cracks of the microalloy steel sheet blank by 'permanent cure'.
Description
Technical Field
The invention relates to the technical field of continuous casting and rolling of steel sheet billets, in particular to a device and a process for controlling corner cracks of a microalloyed steel sheet billet.
Background
The thin slab continuous casting and rolling process is developed at the end of the last 80 th and early 90 th century, is a brand-new short-flow strip steel production new process, is remarkably different from the traditional strip steel production process, has the advantages of remarkable energy conservation, high product qualification rate, simplified production process, short production line, short product production period and the like, and is developed rapidly in recent years.
The production rhythm of the thin slab is compact, and if surface cracks are generated in the production process of the casting blank, the produced casting blank cannot be subjected to off-line surface cleaning, so that the subsequent continuous rolling product has obvious surface quality defects. Particularly, in the process of continuously casting and producing microalloyed steel containing Nb, B, Al and the like by using a thin slab, the influence of the high-temperature solidification characteristic of the microalloyed steel and the action of thermal/mechanical behavior in the subsequent casting blank production process is caused, the casting blank production process presents high surface crack sensitivity, severe cracks are frequently generated at the corner part of the casting blank, and further severe quality defects such as 'edge breakage', 'block falling' and the like are generated at the edge part of a continuously rolled plate, so that the thin slab is concerned by the industry.
In order to effectively eliminate the corner crack defect in the continuous casting process of the microalloy steel sheet billet, the utility model patent with the application number of 201020149011.3 discloses a narrow-face copper plate structure of a crystallizer of a sheet billet continuous casting machine, wherein the working face of the narrow-face copper plate structure is in an inwards concave cambered surface structure and is linearly arranged at the center of the cross section of a cooling water tank. By using the crystallizer structure, the corner of the casting blank forms an obtuse-angled corner structure in the solidification process in the crystallizer and is far away from a crystallizer cooling water tank, the corner temperature of the casting blank in the solidification process in the crystallizer and the corner temperature of the straightening area in the subsequent continuous casting production process are obviously improved, so that a third brittle temperature area of steel is avoided, and the generation of corner cracks of the casting blank is reduced. Application number is 201120089500.9's utility model patent, discloses a chamfer crystallizer leptoprosopy copper for sheet bar continuous casting, and it is through the regional arcwall face structural design of bight, has fallen sheet bar right angle structure, and casting blank bight is showing at the temperature of processes such as bending and aligning and is improving, has reduced sheet bar corner crack and has produced. The utility model discloses a patent of application number 200720089029.7, the similar regional convex curved surface structure's of bight leptoprosopy crystallizer of having disclosed equally, its casting blank bight crack control principle is similar with the utility model patent of application number 201120089500.9. Recently, patent application No. 201710511057.1 discloses a method for controlling edge crack of CSP niobium-containing low alloy steel. The method mainly reduces the generation of niobium-containing low-alloy steel edge cracks by controlling molten steel components, protecting casting precisely by a tundish, increasing a T-shaped drainage channel by an inner arc of a continuous casting secondary cooling bending roller, controlling the heating temperature and the reduction in the rolling process and the like.
In addition, an academic paper entitled 'cause and control of crack at the edge of a CSP hot rolled plate coil' discloses measures for reducing crack generation at the corner of a microalloyed steel sheet billet by controlling the contents of carbon, nitrogen and the like in molten steel, optimizing vibration parameters of a crystallizer, performing a secondary cooling water distribution process and the like; an academic paper entitled 'analysis of cause of transverse corner cracking of a thin slab' proposes two measures of increasing the temperature of the thin slab and reducing the nitrogen content to prevent the transverse corner cracking; the academic paper entitled 'cause and control of edge crack of CSP continuous casting sheet billet' proposes to control the edge crack generation of microalloy steel by reducing the content of Cu and N components in steel, avoiding peritectic range, reducing secondary cooling water distribution, increasing a cross sector spray water baffle, optimizing the physical property of casting powder and the like.
In recent years, through deep detection of the high-temperature solidification characteristic of a microalloy steel continuous casting blank and systematic analysis of the stress behavior of the casting blank in the continuous casting production process of a thin slab, the key factor for generating corner cracks of the microalloy steel thin slab is that the cooling speed is insufficient in the high-temperature solidification process of corner tissues of the casting blank, so that microalloy carbonitride is concentrated and precipitated in a chain shape along the structure grain boundary of the microalloy carbonitride, and the structure grain boundary of the casting blank is embrittled. Meanwhile, because the continuous casting speed of the sheet billet is high, the cooling strength of the casting blank in a secondary cooling area such as a grid, a sector 1 section and the like is high, the temperature of the corner part of the casting blank entering the sector 1 section is too low in the process of large deformation reduction of a liquid core, and the brittle tissue of the corner part of the casting blank is seriously cracked under the action of concentrated stress. Therefore, the high-temperature solidification process structure of the corner of the microalloy steel thin slab is cooled at a high speed, the microalloy carbonitride is dispersed and precipitated in the structure crystal, the structural plasticity of the corner of the casting blank is improved, the temperature of the corner of the casting blank entering a liquid core pressing section is properly improved, the stress is reduced, and the method is a fundamental way for solving the frequent crack of the corner of the microalloy steel thin slab.
However, it can be seen from the above-mentioned presently published microalloy steel sheet bar corner crack control method that the third brittle temperature zone principle of steel is mainly used, the temperature of the over-straightening zone of the casting blank corner is increased by passivating the corner structural design of the crystallizer or developing the casting flow secondary cooling and weak cooling water distribution technology (including the water guide method), and the generation of the corner crack of the casting blank is reduced, or the microalloy and nitrogen content in steel is reduced by controlling the molten steel components and protecting the casting, so that the precipitation amount of microalloy carbonitride in the casting blank tissue grain boundary is reduced, which is not based on the fundamental mechanism of the corner crack generation of the microalloy sheet bar, and the actual implementation process crack control effect is not very ideal. Meanwhile, the narrow composition controls the components of molten steel or reduces the components such as nitrogen in steel, so that the difficulty is high in the practical implementation process of steel making and the like, and the stable control is difficult. Therefore, the crack generation of the microalloy steel casting blank cannot be comprehensively controlled by each thin slab production line at home and abroad at present.
In the actual continuous casting production process of microalloy steel containing Nb, B, Al and the like, the precipitation temperature of carbonitride of the microalloy steel is mostly concentrated in a 730-1120 ℃ interval in nucleation modes such as crystal boundary, dislocation, homogenization and the like, and the casting blank corner in the temperature interval penetrates through the whole continuous casting blank production flow, namely a crystallizer, a foot roll area, a grid area, 1-3 fan-shaped sections and a bending and straightening area. The characteristics of solidification and heat transfer of thin slab casting flow are detailed, and the precipitation kinetics of microalloy steel carbonitride are combined, if the corner of a casting blank can be rapidly cooled in a crystallizer, a foot roller and other regions, so that the temperature of the corner at the front side of a grid region is reduced to be below 700 ℃ (the temperature of the subcutaneous 10mm range of the corner of the casting blank is reduced to be less than 730 ℃), microalloy carbonitride at the corner of the casting blank can be dispersed and precipitated in tissue crystals, and the problem that the microalloy carbonitride is intensively precipitated and embrittled in crystal boundaries along the corner tissue in the continuous casting process of microalloy steel thin slabs is solved. On the basis of the strong control cooling measure, if the corner part of the casting blank is solidified to form a shape which is beneficial to the flowing of narrow metal of the casting blank to the side arc direction in the liquid core reduction process through the corner structure design of the crystallizer, the integral cooling level of the casting blank in the grid area and the sector 1 section is reduced, the temperature of the corner part of the casting blank entering the liquid core pressure lower section is increased, the corner part stress of the casting blank in the liquid core reduction process can be expected to be greatly reduced, and the corner crack generation of the microalloy steel casting blank is comprehensively and fundamentally controlled.
Therefore, by combining the actual high-temperature solidification characteristic of microalloyed steel and the continuous casting production process and equipment of the thin slab, the process and the matched equipment thereof which can fundamentally and stably eliminate the corner cracks generated in the continuous casting process of the microalloyed steel thin slab are developed, and the process and the matched equipment have important practical significance for realizing the high-quality, high-efficiency and green production of the microalloyed steel thin slab.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides equipment and a process for controlling the corner cracks of the microalloy steel sheet billet, which can stably realize the dispersion and precipitation of microalloy carbonitride of a casting blank corner structure, strengthen the casting blank corner structure by self, promote narrow-face metal to flow to a side arc in the large deformation reduction process of a casting blank liquid core, reduce the stress of the casting blank corner, and control the generation of the corner cracks of the microalloy steel sheet billet by 'radical cure'.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
on one hand, the invention provides a micro alloy steel thin slab corner crack control device, which comprises a secondary cooling water distribution system, a crystallizer and a new enhanced spraying system in a narrow-face foot roller area of the crystallizer;
the secondary cooling water distribution system of the wide surface of the casting blank adopts the original secondary cooling water distribution system based on target surface temperature control;
the crystallizer is a corner efficient heat transfer narrow surface Gaussian concave curved surface crystallizer, the working surface of the inner surface of a narrow surface copper plate of the crystallizer is transversely provided with a Gaussian concave curve structure which is symmetrical by the transverse width central line from top to bottom, and the vertical distance value from the curve peak point of the Gaussian concave curve structure to the connecting line of two corners on the working surface side at the corresponding height of the narrow surface copper plate of the crystallizer is 4.5-10.0 mm according to the section thicknesses of different sheet billets;
the working surface of the inner surface of the narrow-face copper plate of the crystallizer is a continuously-changed curve structure meeting the solidification shrinkage characteristic of the narrow face of the casting blank along the center direction of the wide face along the height direction; the back side and the two side surfaces of the narrow-surface copper plate are both in a linear structure;
the cooling water tanks of the narrow-face copper plate of the crystallizer are of a circular structure and are vertically distributed along the height direction of the crystallizer, the size of the cross section of the water tank close to the corner area of the crystallizer is 1.0-1.2 times of that of the cross section of the water tank in the middle area of the narrow-face copper plate in the width direction, and the number of the water tanks is determined by the width of the narrow-face copper plate and the size of the cross section of the water tank; the connecting line of the centers of the cross sections of the water tanks is integrally in a Gaussian curve structure concave to the working surface of the narrow-surface copper plate, and the water tanks are symmetrically distributed by the transverse width center line of the narrow-surface copper plate; wherein, the distance from the central line of the water tank at the width central line of the narrow-face copper plate or the central connecting line of 2 water tanks which are distributed most close to the width central line of the narrow-face copper plate symmetrically to the working surface of the narrow-face copper plate is 20 mm-30 mm; the distance between the water tank closest to the side surface of the narrow-surface copper plate and the corresponding side surface of the narrow-surface copper plate is 5.0-10.0 mm, and the distance change range between the center of the water tank at the width center line of the narrow-surface copper plate or the center connecting lines of 2 water tanks symmetrically distributed closest to the width center line of the narrow-surface copper plate and the center connecting lines of 2 water tanks closest to the side surface of the narrow-surface copper plate is 2.0-10.0 mm; the distribution positions of other water tanks are distributed at equal intervals along the width direction of the copper plate from the central connecting line of the cross section of the water tanks;
the crystallizer narrow-face copper plate is of a structure with a wide upper opening and a narrow lower opening, the width difference between the upper opening and the lower opening of the narrow-face copper plate is 0.2-1.0 mm according to the thickness of a casting blank produced by continuous casting, and the width difference is linearly reduced from the upper opening to the lower opening along the height direction; the larger the thickness of the narrow-face copper plate is, the larger the width difference between the upper opening and the lower opening is; the thickness of the upper opening and the lower opening of the narrow-face copper plate is the same, and the thickness of the middle area in the height direction of the narrow-face copper plate is the thickness of the upper opening or the lower opening plus the value of a continuous change curve of the corresponding working surface in the height direction;
the height range of the narrow-face copper plate of the crystallizer is 900 mm-1300 mm;
the corner efficient heat transfer narrow-surface Gaussian concave curved surface crystallizer is suitable for continuous casting of all sheet billets with the section thickness of 50-135 mm, and the use process of the crystallizer only needs to ensure that the installation positions of a meniscus and a lower opening of the crystallizer are the same as those of a meniscus and a lower opening of a copper plate of a traditional flat-plate narrow-surface crystallizer;
the new enhanced spraying system for the narrow-face foot roller area of the crystallizer comprises a new water supply pipeline, a new enhanced spraying frame and a forced cooling water distribution control system;
the basic design parameters of the newly added water supply pipeline are as follows:
① pipeline water pressure, the water pressure sent to the newly-added strong spraying frame is 0.3 MPa-1.0 MPa;
② pipeline flow rate, wherein the pipeline water supply capacity is 500L/min-800L/min;
③ matched with a pipeline flowmeter and a remote controllable regulating valve according to the pipeline pressure and flow requirement;
the new enhanced spraying frame is fixed right below the narrow-surface copper plate of the corner efficient heat transfer narrow-surface Gaussian concave curved surface crystallizer and is connected with the newly added water supply pipeline; the length of the new enhanced spraying frame is from the outlet of the crystallizer to the inlet of the grating area; the nozzle of the new enhanced spray frame is a conical solid nozzle or a square solid nozzle, the spray frame is subjected to strong spray on the inner arc corner and the outer arc corner of the casting blank in an aerial fog cooling or pure water cooling mode, and the strong spray cooling action range of the corner of the casting blank is ensured to be changed from 30mm to 75mm from the corner point according to the change of the thickness section of the casting blank; the distance between the extension line of the tail end of each nozzle and the corner of the casting blank is 50 mm-150 mm; the spraying angle of the nozzle is comprehensively determined and selected to be 30-90 degrees according to the water pressure of the pipeline and the distance between the nozzle and the corner of the casting blank; the number of the nozzles is determined by the jetting angle of the nozzles and the length of the spraying frame, and the nozzles in all directions are arranged at equal intervals along the height direction; the maximum flow of the nozzle is determined by the spray angle of the nozzle and the maximum water flow density required by the maximum cooling strength of the casting blank corner;
the strong cooling water distribution control system is independent of the existing secondary cooling water distribution control system of the thin slab continuous casting machine, and dynamically controls water meter control strategies based on steel type and associated with the pulling speed, namely corresponding water meters are selected according to the produced steel type, corresponding cooling water quantity is sent according to the current water meters and the corresponding continuous casting pulling speed, strong spraying water distribution is carried out on the wide-surface foot roll area of the existing secondary cooling water distribution system of the thin slab continuous casting machine in cooperation, and cooling of casting blank corners in the foot roll area is dynamically controlled.
On the other hand, the invention also provides a process for controlling the corner cracks of the microalloyed steel sheet billet, which is realized by adopting the device for controlling the corner cracks of the microalloyed steel sheet billet and specifically comprises the following steps:
according to the microalloyed steel sheet billet corner crack control process, a corner high-efficiency heat transfer narrow surface Gaussian concave curved surface crystallizer in the microalloyed steel sheet billet corner crack control equipment is adopted for the crystallizer, the cooling water flow of the wide surface and the narrow surface of the crystallizer is adjusted, and the condition that the cooling speed of a casting blank corner point in the crystallizer is stably higher than 5.0 ℃/s in the whole process is met;
the wide-surface foot roll area of the crystallizer is based on the existing secondary cooling water distribution system based on target surface temperature control of the thin slab, dynamic water distribution is carried out by adopting an integral enhanced cooling process, the water distribution process of a spraying system is newly enhanced in cooperation with the narrow-surface foot roll area of the crystallizer, the temperature of the casting blank corner entering a grid area is controlled to be reduced to below 700 ℃, and the average cooling speed of the casting blank corner in the grid area is ensured to reach 20-35 ℃/s;
the casting blank stands in the grid area on the basis of the existing secondary cooling water distribution system based on target surface temperature control of the thin slab, dynamic water distribution is carried out by adopting a wide-surface overall slow cooling water distribution process, and the temperature of the corner part of the casting blank entering the segment I is controlled to meet the condition that the temperature is returned to be greater than 860 ℃;
the casting blank stands in the fan-shaped I section and is dynamically distributed by adopting a wide-surface overall slow cooling water distribution process on the basis of the existing secondary cooling water distribution system based on target surface temperature control of a thin slab, and the temperature of the corner of the casting blank out of the fan-shaped I section is controlled to meet the condition that the temperature is returned to be higher than 920 ℃;
after the casting blank is discharged from the sector I section, the subsequent secondary cooling areas all adopt the traditional controlled cooling process of the thin slab.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: according to the microalloy steel sheet billet corner crack control equipment and the process, the corner high-efficiency heat transfer narrow-surface Gaussian concave curved surface crystallizer can fully compensate the solidification shrinkage of a casting blank in the crystallizer, greatly increase the cooling speed of the corner of the casting blank, refine the initial solidification structure grains of the corner of the casting blank and disperse the precipitation of microalloy carbonitride at a high temperature end; meanwhile, the strong cooling of the corner of the secondary cooling foot roller area of the casting blank can further disperse the precipitation of the low-temperature end of the microalloy carbonitride, improve the plasticity of the corner structure of the casting blank and solve the problem that the corner generates brittle structures in the traditional continuous casting production process of the microalloy steel sheet blank; meanwhile, the narrow surface of the continuous casting billet produced by the crystallizer is of a Gaussian arc structure, so that the narrow surface metal flows to the side arc in the large deformation reduction process of the liquid core of the casting billet efficiently, and the stress of the edge corner of the casting billet is reduced, thereby comprehensively controlling the generation of cracks at the edge corner of the microalloy steel sheet billet by 'permanent cure'.
Drawings
Fig. 1 is a schematic view of a narrow-face copper plate of a thin slab corner efficient heat transfer narrow-face gaussian concave curved surface crystallizer provided by an embodiment of the invention;
FIG. 2 is a schematic structural view of an upper opening or a lower opening of a narrow-face copper plate of a crystallizer provided by an embodiment of the invention;
fig. 3 is a schematic view of a new enhanced spray rack for thin slabs provided by an embodiment of the invention.
In the figure: 1. a narrow surface Gaussian concave curved surface of the crystallizer; 2. a cooling water tank on the narrow surface of the crystallizer; 3. an upper opening of a narrow-face copper plate of the crystallizer; 4. a narrow-face copper plate lower opening of the crystallizer; 5. the side surface of the narrow-face copper plate; 6. newly enhancing the spray frame; 7. and (5) casting blank corner parts.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
An example of a CSP producing a SS400-B steel sheet bar having a mold thickness of 90mm at a continuous casting speed of 4.0m/min will be further described with reference to the accompanying drawings.
The equipment for controlling the corner cracks of the microalloyed steel sheet billet in the embodiment comprises a secondary cooling water distribution system, a crystallizer and a newly-enhanced spraying system in a narrow-face foot roller area of the crystallizer. Wherein, the secondary cooling water distribution system of the wide surface of the casting blank adopts the original secondary cooling water distribution system based on target surface temperature control. The adopted crystallizer is a corner high-efficiency heat-transfer narrow-surface Gaussian concave curved surface crystallizer, and the structure of a narrow-surface copper plate of the crystallizer is shown in figures 1 and 2, wherein 1 represents a narrow-surface Gaussian concave curved surface of the crystallizer, namely an inner surface working surface, 2 represents a narrow-surface cooling water tank of the crystallizer, 3 represents an upper opening of the narrow-surface copper plate of the crystallizer, 4 represents a lower opening of the narrow-surface copper plate of the crystallizer, 5 represents one side surface of the narrow-surface copper plate, 6 represents a new strengthening spray rack, 7 represents a casting blank corner, and l1Indicates the height of the narrow-face copper plate of the crystallizer, l2The width of the upper opening of the narrow-side copper plate of the crystallizer is represented by l3Showing the width of the lower opening of the narrow-face copper plate of the crystallizer, C1The distribution curve of the working surface of the narrow face of the crystallizer along the height direction is shown, C2Represents the transverse Gaussian concave curve of the working surface of the narrow side of the crystallizer4The distance from the central line of the water tank at the central line of the width of the narrow-face copper plate or the central line of 2 water tanks which are symmetrically distributed closest to the central line of the width of the narrow-face copper plate to the working surface of the narrow-face copper plate is represented as l5The distance between the narrow-face copper plate of the crystallizer, which is closest to the side water tank, and the side face of the narrow-face copper plate is represented as l6The thickness of the upper opening or the lower opening of the narrow-face copper plate of the crystallizer is represented by l7The vertical distance from the peak point of the transverse Gaussian curve of the working surface to the connecting line of two corners of the working surface side with the corresponding height of the narrow-surface copper plate is shown, △ l indicates the center of the water tank at the center line of the width of the narrow-surface copper plate or the closest part to the center of the water tank at the center line of the width of the narrow-surface copper plateThe distance between the center connecting line of the 2 water tanks symmetrically distributed near the width center line of the narrow-face copper plate and the center connecting line of the 2 water tanks closest to the side face of the narrow-face copper plate. The height l of the narrow copper plate of the crystallizer11100mm, a structure with a wide upper opening and a narrow lower opening, 90mm of the width of the lower opening of the crystallizer, and a width difference l between the upper opening 3 and the lower opening 42-l3Is 0.2mm and is linearly reduced from the upper opening 3 to the lower opening 4 along the height direction of the crystallizer; in the thickness direction of the narrow-face copper plate of the crystallizer, the thickness l of an upper opening 3 of the narrow-face copper plate is designed6The thickness of the lower opening 4 is the same as that of the lower opening, and the thickness of the lower opening is 60 mm. The curve C which is distributed along the height direction is selected to be the curve C which is shown in the table 1 and efficiently meets the solidification shrinkage characteristic of the narrow surface of the casting blank along the central direction of the wide surface1The thickness of the middle area of the narrow-face copper plate in the height direction is the thickness of an upper opening or a lower opening plus a distribution curve C of the corresponding working face in the height direction1The value is obtained.
TABLE 1 Curve value of narrow copper plate working surface of thin slab along height direction
In this embodiment, the transverse gaussian concave curve C of the inner surface working surface of the narrow-side copper plate of the crystallizer2Is selected as a distribution function
The coordinate system takes one corner point of the narrow-face copper plate as an origin, x is along the width direction of the narrow-face copper plate, and y is along the thickness direction of the narrow-face copper plate, and the inner surface working surface points to the back surface of the copper plate. The working surface of the narrow-face copper plate is all in a transverse concave structure by taking the Gaussian curve function from top to bottom, compensation is carried out along a C1 curve, a Gaussian concave curved surface structure is formed from top to bottom, and the vertical distance value l between the peak point of the Gaussian curve of the concave curved surface and the connecting line of two corner parts on the working surface side of the narrow-face copper plate of the crystallizer at the corresponding height7Is 6.0 mm.
The back side and the two side surfaces 5 of the narrow-surface copper plate are both in a linear structure.
In the embodiment, in order to accelerate the cooling speed of the corner of the crystallizer, the cooling water tank 2 of the narrow-face copper plate of the crystallizer is of a circular structure, and 4 water tanks are designed in total and vertically distributed in a penetrating manner along the height direction of the crystallizer; the connecting line of the centers of the cross sections of the water tanks is of a Gaussian curve structure which is concave to the working surface 1 as a whole, and is symmetrically distributed by using the transverse width center line of the narrow-surface copper plate, and the distribution function of the Gaussian curve is
Wherein, the diameters of 2 water grooves in the middle of the narrow-face copper plate
The diameter of 13mm is selected, and the diameter of 2 water grooves on the edge part is selected to be 15 mm. Distance l from central connecting line of cross sections of 2 water tanks in the middle of upper opening or lower opening of crystallizer to working surface of narrow-face copper plate423.69 mm. The distance l from 2 water tanks at the edge of the narrow-face copper plate to the corresponding side of the narrow-face copper plate5The distance △ l between the center connecting line of the 2 water tanks which are symmetrically distributed closest to the width center line of the narrow-face copper plate and the center connecting line of the 2 water tanks which are closest to the side face of the copper plate is 4.1mm, and the 4 water tanks are distributed at equal intervals along the width direction of the narrow-face copper plate.
In order to enhance the cooling of the casting blank at the inner arc angle part and the outer arc angle part of the foot roll area, a new enhanced spraying system is arranged right below the narrow-face copper plate of the crystallizer. In this embodiment, the new enhanced spraying system in the narrow-face foot roller area of the crystallizer includes a new water supply pipeline, a new enhanced spraying frame 6 and an enhanced cooling water distribution control system. The basic design parameters of the newly added water pipeline are as follows:
① pipeline water pressure, the water pressure sent to the newly-added strong spraying frame 6 is 0.8 MPa;
② pipeline flow rate, wherein the water supply capacity of the pipeline is 600L/min;
③ is provided with a pipeline flowmeter with 800L/min effective range and a remote controllable pneumatic diaphragm regulating valve (air-closed type).
In this embodiment, the new strengthening spray frame 6 is fixed under the narrow copper plate of the crystallizer and is fixedly connected with the new water supply pipeline. The length of the new enhanced spray frame 6 isThe outlet of the crystallizer is connected with the inlet of the grid area. The schematic use effect of the new enhanced spray frame 6 in the strong spray cooling of the casting blank corner 7 is shown in fig. 3. The nozzle of the new enhanced spray frame 6 is selected as a conical solid pure water spray nozzle with a spray angle of 60 degrees, and the maximum flow of the nozzle reaches 28L/min under the water pressure of 0.8 MPa. The nozzles are arranged just opposite to the inner arc and the outer arc narrow surface corner of the casting blank in a mode of staggered arrangement of the inner arc and the outer arc from top to bottom, the narrow surface on one side of the casting blank is totally provided with 8 nozzles, 4 nozzles face the inner arc corner of the casting blank and 4 nozzles face the outer arc corner of the casting blank, the nozzles are distributed at equal intervals along the height direction, and the tail end extension line of each nozzle is equal to the distance l between the corresponding casting blank corners8The thickness is 70mm, and the strong spraying coverage of the narrow face corner of the casting blank is ensured to be within the range from the corner point to 45mm away from the corner point. In specific implementation, the strong spraying coverage range of the narrow-face corner of the casting blank varies from a corner point to a corner 30mm away to a corner point to a corner 75mm away according to the variation of the thickness section of the casting blank.
The forced cooling water distribution control system of the new enhanced spray system for the narrow-face foot roll area of the crystallizer is independent of the CSP (cast slab casting) conventional secondary cooling water distribution control system, and is controlled by adopting a water meter control strategy based on steel type categories and associated with pulling speed, namely, corresponding water distribution quantities of different steel types and different pulling speeds are stored in a database in a water meter mode, the system selects a corresponding water meter according to the produced steel type, the water distribution control system is automatically matched with the current continuous casting pulling speed to distribute the corresponding cooling water quantity, and the forced spray water distribution is coordinated with the CSP original wide-face foot roll area based on target surface temperature control, so that the corner of a casting blank in the foot roll area is dynamically controlled. For example, in the present embodiment, based on the above-mentioned gaussian concave narrow-sided copper plate crystallizer for efficiently transferring heat at the corner of the crystallizer, if the center temperature of the wide-sided surface of the foot roll area of the wide-sided surface of the crystallizer is set to 965 ℃, and the amount of water of the spray system is newly increased by 400L/min in the foot roll area of the narrow-sided surface of the crystallizer, the temperature of the grid area of the corner of the SS400-B steel casting blank can be reduced to below 700 ℃, and the average cooling rate can be increased to above 24 ℃/s.
A process for controlling the corner cracks of a microalloyed steel sheet billet is realized by adopting the device for controlling the corner cracks of the microalloyed steel sheet billet. In this embodiment, the corner high-efficiency heat transfer narrow-surface Gaussian concave curved surface crystallizer in the microalloy steel sheet billet corner crack control equipment is adopted, and the cooling water quantity of the wide surface and the narrow surface of the original crystallizer is used to ensure that the whole course of the casting blank corner cooling speed is stably higher than 10 ℃/s.
In the embodiment, based on the high-efficiency heat transfer Gaussian concave narrow-surface copper plate crystallizer at the corner of the crystallizer, based on the existing secondary cooling water distribution system based on target surface temperature control of CSP, the integral forced cooling water distribution process of the wide surface of the casting blank is adopted, the central temperature of the wide surface foot roll area of the crystallizer is set to be 965 ℃, the water quantity of 400L/min is sent by a newly-enhanced spray system in the narrow surface foot roll area of the crystallizer, the temperature of the grid area of the corner of the SS400-B steel casting blank can be reduced to below 700 ℃, and the average cooling speed is up to above 24 ℃/s.
In the embodiment, on the basis of the above cooling control, the casting blank stands in the grid area for the CSP existing secondary cooling water distribution system based on target surface temperature control, a wide-surface overall slow cooling water distribution process is adopted, the central target surface temperature 1033 ℃ of the wide surface of the casting blank in the grid area is set, and the corner temperature of the casting blank entering the segment I can be ensured to meet the condition that the temperature returns to be higher than 860 ℃.
In the embodiment, the casting blank is cooled in the segment I, based on the traditional secondary cooling water distribution system based on target surface temperature control of CSP, a wide-surface overall slow cooling water distribution process is adopted, the central target surface temperature 1054 ℃ of the wide surface of the casting blank in the segment I is set, and the corner temperature of the casting blank out of the segment I can be ensured to meet the temperature return requirement to be higher than 920 ℃. After the casting blank is discharged from the sector I section, the subsequent secondary cooling areas all adopt the traditional controlled cooling process of the thin slab.
By the device and the process for controlling the corner cracks of the microalloyed steel sheet billet, the dispersion and precipitation of BN (boron nitride) at the corner of the sheet billet produced by SS400-B steel in CSP (cast steel plate) can be stably realized, the corner structure of the casting blank is strengthened by the BN, the narrow-face metal in the large deformation reduction process of the liquid core of the casting blank is promoted to flow to the side arc, the stress of the corner of the casting blank is reduced, and the corner cracks of the sheet billet are controlled by 'permanent cure'.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions and scope of the present invention as defined in the appended claims.
Claims (2)
1. The utility model provides a little alloy steel sheet bar corner crack control equips which characterized in that: the equipment comprises a secondary cooling water distribution system, a crystallizer and a new enhanced spraying system in a narrow-face foot roller area of the crystallizer;
the secondary cooling water distribution system of the wide surface of the casting blank adopts the existing secondary cooling water distribution system based on target surface temperature control of the thin slab;
the crystallizer is a corner high-speed heat transfer narrow-surface Gaussian concave curved surface crystallizer, the working surface of the inner surface of the narrow-surface copper plate is transversely provided with a Gaussian concave curve structure which is symmetrical by the transverse width central line from top to bottom, and the vertical distance value from the curve peak point of the Gaussian concave curve structure to the connecting line of two corners on the working surface side at the corresponding height of the narrow-surface copper plate of the crystallizer is 4.5-10.0 mm according to the section thicknesses of different sheet billets;
the working surface of the inner surface of the narrow-face copper plate of the crystallizer is a continuously-changed curve structure meeting the solidification shrinkage characteristic of the narrow face of the casting blank along the center direction of the wide face along the height direction; the back side and the two side surfaces of the narrow-surface copper plate are both in a linear structure;
the cooling water tanks of the narrow-face copper plate of the crystallizer are of a circular structure and are vertically distributed along the height direction of the crystallizer, the size of the cross section of the water tank close to the corner area of the crystallizer is 1.0-1.2 times of that of the cross section of the water tank in the middle area of the narrow-face copper plate in the width direction, and the number of the water tanks is determined by the width of the narrow-face copper plate and the size of the cross section of the water tank; the connecting line of the centers of the cross sections of the water tanks is integrally in a Gaussian curve structure concave to the working surface of the narrow-surface copper plate, and the water tanks are symmetrically distributed by the transverse width center line of the narrow-surface copper plate; wherein, the distance from the central line of the water tank at the width central line of the narrow-face copper plate or the central connecting line of 2 water tanks which are distributed most close to the width central line of the narrow-face copper plate symmetrically to the working surface of the narrow-face copper plate is 20 mm-30 mm; the water tank closest to the side surface of the narrow-surface copper plate is 5.0-10.0 mm away from the corresponding side surface of the narrow-surface copper plate by the side of the water tank closest to the corresponding side surface, and the distance change range between the center of the water tank at the width center line of the narrow-surface copper plate or the center connecting lines of 2 water tanks symmetrically distributed closest to the width center line of the narrow-surface copper plate and the center connecting lines of 2 water tanks closest to the side surface of the narrow-surface copper plate is 2.0-10.0 mm; the distribution positions of other water tanks are distributed at equal intervals along the width direction of the copper plate from the central connecting line of the cross section of the water tanks;
the crystallizer narrow-face copper plate is of a structure with a wide upper opening and a narrow lower opening, the width difference between the upper opening and the lower opening of the narrow-face copper plate is 0.2-1.0 mm according to the thickness of a casting blank produced by continuous casting, and the width difference is linearly reduced from the upper opening to the lower opening along the height direction; the larger the thickness of the narrow-face copper plate is, the larger the width difference between the upper opening and the lower opening is; the thickness of the upper opening and the lower opening of the narrow-face copper plate is the same, and the thickness of the middle area in the height direction of the narrow-face copper plate is the thickness of the upper opening or the lower opening plus the value of a continuous change curve of the corresponding working surface in the height direction;
the height range of the narrow-face copper plate of the crystallizer is 900 mm-1300 mm;
the corner high-speed heat transfer narrow-surface Gaussian concave curved surface crystallizer is suitable for continuous casting of all sheet billets with the section thickness of 50-135 mm, and the use process only needs to ensure that the installation positions of a meniscus and a lower opening of the crystallizer are the same as those of a meniscus and a lower opening of a copper plate of a traditional flat-plate narrow-surface crystallizer;
the new enhanced spraying system for the narrow-face foot roller area of the crystallizer comprises a new water supply pipeline, a new enhanced spraying frame (6) and a forced cooling water distribution control system;
the basic design parameters of the newly added water supply pipeline are as follows:
① pipeline water pressure, the water pressure sent to the newly-added strong spraying frame is 0.3 MPa-1.0 MPa;
② pipeline flow rate, wherein the pipeline water supply capacity is 500L/min-800L/min;
③ matched with a pipeline flowmeter and a remote controllable regulating valve according to the pipeline pressure and flow requirement;
the new enhanced spraying frame (6) is fixed right below the narrow-surface copper plate of the corner high-speed heat transfer narrow-surface Gaussian concave curved surface crystallizer and is connected with the newly added water supply pipeline; the length of the new enhanced spraying frame (6) is from the outlet of the crystallizer to the inlet of the grating area; the nozzles of the new enhanced spray frame (6) are conical solid nozzles or square solid nozzles, the spray cooling or pure water cooling mode is adopted, the strong spray is performed on the inner arc corner and the outer arc corner of the casting blank, and the strong spray cooling action range of the casting blank corner is ensured to be 30-75 mm from the corner point to the corner point according to the change of the thickness section of the casting blank; the distance between the extension line of the tail end of each nozzle and the corner of the casting blank is 50 mm-150 mm; the spraying angle of the nozzle is comprehensively determined and selected to be 30-90 degrees according to the water pressure of the pipeline and the distance between the nozzle and the corner of the casting blank; the number of the nozzles is determined by the jetting angle of the nozzles and the length of the spraying frame, and the nozzles in all directions are arranged at equal intervals along the height direction; the maximum flow of the nozzle is determined by the spray angle of the nozzle and the maximum water flow density required by the maximum cooling strength of the casting blank corner;
the strong cooling water distribution control system is independent of the existing secondary cooling water distribution control system of the thin slab continuous casting machine, and dynamically controls water meter control strategies based on steel type and associated with the pulling speed, namely corresponding water meters are selected according to the produced steel type, corresponding cooling water amount is sent according to the current water meters and the corresponding continuous casting pulling speed, and the strong cooling water distribution control system is cooperated with the wide-surface foot roll area of the existing secondary cooling water distribution system based on target surface temperature control of the thin slab to dynamically control the cooling of casting blank corners in the foot roll area.
2. A process for controlling corner cracks of a microalloyed steel thin slab, which is realized by adopting the device for controlling the corner cracks of the microalloyed steel thin slab as claimed in claim 1, and is characterized in that:
according to the process for controlling the corner cracks of the microalloyed steel sheet billet, a corner high-speed heat transfer narrow surface Gaussian concave curved surface crystallizer in the microalloyed steel sheet billet corner crack control device as claimed in claim 1 is adopted in the crystallizer, the flow of cooling water of the wide surface and the narrow surface of the crystallizer is adjusted, and the condition that the cooling speed of a casting blank corner point in the crystallizer is stably higher than 5.0 ℃/s in the whole process is met;
the wide-surface foot roll area of the crystallizer is based on the existing secondary cooling water distribution system based on target surface temperature control of the sheet billet, dynamic water distribution is carried out by adopting an integral enhanced cooling process, and the water distribution process of a spraying system is newly enhanced in cooperation with the narrow-surface foot roll area of the crystallizer in the microalloyed steel sheet billet corner crack control equipment, so that the temperature of the corner part of the casting blank entering a grid area is controlled to be reduced to below 700 ℃, and the average cooling speed of the corner part of the casting blank in the grid area is ensured to reach 20-35 ℃/s;
the casting blank stands in the grid area on the basis of the existing secondary cooling water distribution system based on target surface temperature control of the thin slab, dynamic water distribution is carried out by adopting a wide-surface overall slow cooling water distribution process, and the temperature of the corner part of the casting blank entering the segment I is controlled to meet the condition that the temperature is returned to be greater than 860 ℃;
the casting blank stands in the fan-shaped I section and is dynamically distributed by adopting a wide-surface overall slow cooling water distribution process on the basis of the existing secondary cooling water distribution system based on target surface temperature control of a thin slab, and the temperature of the corner of the casting blank out of the fan-shaped I section is controlled to meet the condition that the temperature is returned to be higher than 920 ℃;
after the casting blank is discharged from the sector I section, the subsequent secondary cooling areas all adopt the traditional controlled cooling process of the thin slab.
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| CN111992685B (en) * | 2020-08-10 | 2022-03-01 | 湖南华菱涟源钢铁有限公司 | Method for reducing edge-rot defects of steel coil of Q355B in thin slab continuous casting and rolling production line |
| CN112404382B (en) * | 2020-10-30 | 2022-03-08 | 山东钢铁集团日照有限公司 | Method for reducing bow defects of casting blank of ultra-wide slab continuous casting machine |
| CN113145817B (en) * | 2020-12-24 | 2023-01-10 | 山东寿光巨能特钢有限公司 | Method for controlling microcracks on surface of manganese-containing steel large round billet |
| CN112743055A (en) * | 2020-12-29 | 2021-05-04 | 马鞍山钢铁股份有限公司 | Crystallizer device for refining original austenite grain size of continuous casting slab corner |
| CN114054710B (en) * | 2021-11-13 | 2023-01-20 | 攀钢集团研究院有限公司 | Method for improving center quality of large-section rectangular continuous casting billet |
| CN115090847B (en) * | 2022-05-31 | 2024-03-08 | 天津钢铁集团有限公司 | Spray cooling control system and control method for corner of slab after exiting crystallizer |
| CN115069997A (en) * | 2022-05-31 | 2022-09-20 | 天津钢铁集团有限公司 | Casting blank corner spray cooling structure based on slab caster narrow surface foot roll |
| CN115415489B (en) * | 2022-09-05 | 2024-02-13 | 东北大学 | Continuous casting equipment and process for aluminum/aluminum alloy sheet billet |
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| CH552423A (en) * | 1972-04-18 | 1974-08-15 | Concast Ag | METHOD AND DEVICE FOR CONTROLLING HEAT EXTRACTION IN KOKILLEN DURING CONTINUOUS CASTING. |
| JPS5641051A (en) * | 1979-09-14 | 1981-04-17 | Nippon Steel Corp | Continuous casting method of steel |
| CN201644727U (en) * | 2010-04-02 | 2010-11-24 | 河北钢铁股份有限公司唐山分公司 | Narrow-surface copper plate structure for thin-slab caster mould |
| CN201871696U (en) * | 2010-10-27 | 2011-06-22 | 钢铁研究总院 | Narrow face copper plate of crystallizer with curved structure |
| CN202052915U (en) * | 2011-03-30 | 2011-11-30 | 钢铁研究总院 | Narrow-surface copper plate of chamfer crystallizer for thin slab continuous casting |
| CN202146982U (en) * | 2011-05-03 | 2012-02-22 | 钢铁研究总院 | Chamber crystallizer narrow-surface copper plate with a combined cooling water channel |
| DE102012108952A1 (en) * | 2012-09-21 | 2014-05-15 | Voestalpine Stahl Gmbh | Apparatus for continuous casting of metals |
| CN203091693U (en) * | 2013-02-19 | 2013-07-31 | 钢铁研究总院 | Combined crystallizer copper plate with longitudinal groove |
| CN103433448A (en) * | 2013-08-14 | 2013-12-11 | 东北大学 | Method for determining heat flux density of continuous casting crystallizer based on flux film and air gap dynamic distribution |
| CN104209484B (en) * | 2014-09-15 | 2017-02-08 | 首钢总公司 | Narrow-face copper plate for chamfer crystallizer |
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