CN114734010B - Production method of thin slab continuous casting and rolling online thinned casting blank - Google Patents
Production method of thin slab continuous casting and rolling online thinned casting blank Download PDFInfo
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- CN114734010B CN114734010B CN202210269260.3A CN202210269260A CN114734010B CN 114734010 B CN114734010 B CN 114734010B CN 202210269260 A CN202210269260 A CN 202210269260A CN 114734010 B CN114734010 B CN 114734010B
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- 238000005266 casting Methods 0.000 title claims abstract description 156
- 238000005096 rolling process Methods 0.000 title claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 42
- 238000009749 continuous casting Methods 0.000 title claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 50
- 238000001816 cooling Methods 0.000 claims abstract description 37
- 230000009467 reduction Effects 0.000 claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 230000000881 depressing effect Effects 0.000 claims abstract description 6
- 238000007711 solidification Methods 0.000 claims description 21
- 230000008023 solidification Effects 0.000 claims description 21
- 239000000498 cooling water Substances 0.000 claims description 16
- 238000003825 pressing Methods 0.000 claims description 14
- 239000000443 aerosol Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000007791 liquid phase Substances 0.000 claims description 3
- 208000029154 Narrow face Diseases 0.000 claims 1
- 238000000034 method Methods 0.000 description 9
- 230000008901 benefit Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
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- 230000004075 alteration Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 230000003211 malignant effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- VYQRBKCKQCRYEE-UHFFFAOYSA-N ctk1a7239 Chemical compound C12=CC=CC=C2N2CC=CC3=NC=CC1=C32 VYQRBKCKQCRYEE-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
Classifications
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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
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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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
- B22D11/0406—Moulds with special profile
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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
- B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
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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
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The application discloses a production method of a thin slab continuous casting and rolling online thinned casting blank, which is characterized by comprising the following steps of: the molten steel in the tundish is treated by a crystallizer to obtain a casting blank with a liquid core; carrying out liquid core depressing treatment on the casting blank with the liquid core through a secondary cooling fan-shaped section to obtain the casting blank with the target thickness; cooling the casting blank with the target thickness, and performing soft reduction treatment on the solidified tail end to obtain an all-solid-state casting blank; carrying out heavy reduction treatment on the all-solid-state casting blank to obtain a thinned casting blank; and (3) feeding the thinned casting blank into a rolling mill at a high pulling speed to roll to obtain a finished product. The embodiment of the application solves the technical problem that the existing headless production line cannot continuously improve the thickness of the casting blank due to the limitation of the pulling speed by providing the production method for the online reduction of the casting blank of the continuous casting and rolling of the sheet billet, and improves the production capacity of the headless production line.
Description
Technical Field
The invention relates to the technical field of continuous casting and rolling of thin slabs, in particular to a production method of online thinned casting blanks for continuous casting and rolling of thin slabs.
Background
The continuous casting and rolling endless rolling technology of the sheet billet integrates the procedures of continuous casting, heating, hot continuous rolling and the like which are dispersed in the traditional procedures, and the procedures are simpler and more efficient. As the casting blank thickens, the drawing speed is improved, the steel flux is greatly improved, and the matching production of the single-strand continuous casting machine and the continuous rolling machine is realized. The endless rolling technology is industrially applied on an Italian Abodi ESP production line for the first time in 2009, abodi endless rolling technology is introduced into sunlight steel in China in 2013, and the endless rolling technology has wider development prospect along with the continuous manifestation of the advantages of the endless rolling technology.
In order to realize direct rolling of a casting blank and achieve the aim of saving a large amount of energy, the thickness of the casting blank needs to be limited within the acceptable range of continuous rolling, so that the advantages of continuous casting and rolling in technical economy can be fully exerted. From the standpoint of continuous casting, the production of thin slabs places a burden on the mold and on the submerged entry nozzle. If the thickness of the inner cavity of the crystallizer is too small, the insertion of the immersed nozzle is not facilitated, and the molten pool in the crystallizer is too small, so that the scouring of molten steel injection flow to a solidified blank shell is increased, the fluctuation of the molten steel level in the crystallizer is aggravated, the casting difficulty is increased, and the thickness of the inner cavity of the crystallizer is not too small. In order to increase the size of the inner cavity of the crystallizer, improve the flow field of the crystallizer and prolong the service life of the submerged nozzle, and simultaneously provide a thin slab for rolling mill to directly and continuously roll, the continuous casting slab on-line thinning technology has been widely adopted. At present, the MCCR production line adopts a fusion technology of liquid core pressing and dynamic soft pressing, namely, the liquid core pressing is adopted at the outlet of a crystallizer, and the dynamic soft pressing is adopted at the solidification end.
However, in the process of implementing the present application, the present application finds that at least the following technical problems exist in the above technology:
The fusion technology of the hydraulic core pressing and the dynamic soft pressing of the MCCR achieves the purposes of on-line thinning of casting blanks and improvement of internal quality without affecting the service life of the sector section. However, the requirement of the headless production line on the pull speed of the metal second flow casting machine limits the further increase of the thickness of the casting blank, increases the casting difficulty of the casting machine, and influences the exertion of the productivity of the production line.
Disclosure of Invention
The embodiment of the application solves the technical problem that the existing headless production line cannot continuously increase the thickness of a casting blank due to the limitation of the pulling speed by providing the production method for the online reduction of the casting blank by continuous casting and rolling of the sheet billet.
The embodiment of the application provides a production method of a thin slab continuous casting and rolling online thinned casting blank, which comprises the following steps:
the molten steel in the tundish is treated by a crystallizer to obtain a casting blank with a liquid core;
carrying out liquid core depressing treatment on the casting blank with the liquid core through a secondary cooling fan-shaped section to obtain the casting blank with the target thickness;
cooling the casting blank with the target thickness, and performing soft reduction treatment on the solidified tail end to obtain an all-solid-state casting blank;
Carrying out heavy reduction treatment on the all-solid-state casting blank to obtain a thinned casting blank;
And (3) feeding the thinned casting blank into a rolling mill at a high pulling speed to roll to obtain a finished product.
Further, the crystallizer adopts a funnel-shaped crystallizer, and the thickness of the outlet of the crystallizer is 100-160mm so as to produce slabs with the width of 1100-1600 mm.
Further, the wide cooling water quantity of the crystallizer is 6000-8600L/min, the narrow cooling water quantity of the crystallizer is 400-600L/min, and the cooling water flow rate is 10-13m/s.
Further, the step of obtaining the casting blank with the target thickness after the casting blank with the liquid core is subjected to liquid core depressing treatment through the secondary cooling fan-shaped section comprises the following steps:
and the casting blank with the liquid core enters a secondary cooling fan-shaped section after exiting the crystallizer, and is subjected to liquid core pressing in fan-shaped sections 0, 1 and 2, wherein the total pressing amount is 5-20mm.
Further, the sector section is provided with a position sensor, and the casting blank is pressed to the target thickness through position control, wherein the inlet position of the zero sector section is kept consistent with the outlet position of the crystallizer, and the casting blank is pressed only at the outlet position.
Further, cooling the casting blank with the target thickness, and performing soft reduction treatment on the solidification end to obtain an all-solid-state casting blank comprises the following steps:
The casting blank with the liquid core passes through the arc section, is continuously bent and straightened to enter the horizontal section, and is continuously cooled by secondary cooling water, so that the liquid core of the casting blank with the liquid core gradually disappears;
And before the liquid phase in the casting blank with the liquid core completely disappears, carrying out soft reduction treatment on the solidification tail end through the sector section to obtain the full-solid casting blank.
Further, the secondary cooling in the sector section is aerosol cooling, the specific water quantity of secondary cooling is 1.5-2.5L/kg, the pressure of secondary cooling is 1.1-4.0bar, and the thickness of the casting blank after the casting blank is discharged out of the sector section is 90-135mm.
Further, the soft reduction of the solidification end is 3-5mm and is completed by 2-3 segments, wherein the solid-liquid fraction of the solidification end under soft reduction is 0.6-0.8.
Further, the step of obtaining the thinned casting blank after the all-solid-state casting blank is subjected to heavy reduction treatment comprises the following steps:
And after the all-solid-state casting blank is subjected to sector section forming, solid-state reduction is performed after the casting blank is subjected to a heavy reduction device, and the normal running speed of the casting blank after the casting blank is subjected to sector section forming is 4.5-6m/min.
Further, the casting machine is in a straight arc shape, the radius of the casting machine is 5.5-6.0m, and the metallurgical length is 20-40m.
One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
The application achieves the aim of further thinning casting blanks by increasing the heavy reduction treatment at the outlet of the continuous casting machine, and can thin the thickness of the plate blanks before entering the rolling mill by 10-30mm on the current basis, thereby improving the running speed of the plate blanks, reducing the load of the rolling mill, meeting the requirements of a headless production line on the second flow rate of metal and the drawing speed of the casting machine, simultaneously realizing the increase of the outlet thickness of the crystallizer, effectively increasing the inner cavity volume of the crystallizer, ensuring more uniform flow field and temperature field in the crystallizer, facilitating the melting of casting powder and controlling the fluctuation of the liquid level of the crystallizer, remarkably reducing the quality problems of slag rolling and the like, simultaneously reducing the incidence of malignant accidents such as steel leakage and the like, and improving the production capacity of the headless production line.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a method for producing a thin slab continuous casting and rolling on-line thinned casting blank provided in the first embodiment of the application;
FIG. 2 is a schematic view of an exemplary sheet bar caster in accordance with an embodiment of the present application;
FIG. 3 is a front view of a weight pressing apparatus according to an embodiment of the present application;
fig. 4 is a side view of a weight pressing device in an embodiment of the application.
Detailed Description
In order to overcome the defects of the prior art, the application provides a method for on-line thinning of a casting blank by a continuous casting and rolling endless production line of a sheet billet, which solves the technical problem that the thickness of the casting blank cannot be continuously improved due to the limitation of the pulling speed in the conventional endless production line by adopting a funnel-shaped crystallizer, adopting liquid core reduction after the casting blank exits the crystallizer, adopting dynamic soft reduction at the solidification tail end of the casting blank and adopting further heavy reduction after the casting blank exits a fan-shaped section.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
Example 1
As shown in fig. 1, a method for online thinning of a casting blank in a headless continuous casting and rolling production line of a thin slab provided by an embodiment of the application includes:
Step S1: molten steel in the tundish enters a casting machine and is treated by a crystallizer 1 to obtain a casting blank with a liquid core;
Step S2: carrying out liquid core depressing treatment on the casting blank with the liquid core through a secondary cooling fan-shaped section to obtain the casting blank with the target thickness;
step S3: cooling a casting blank with a target thickness, and performing soft reduction treatment on the solidified tail end to obtain an all-solid casting blank;
Step S4: carrying out heavy reduction treatment on the all-solid-state casting blank to obtain a thinned casting blank;
step S5: and (5) feeding the thinned casting blank into a rolling mill for rolling at a high pulling rate to obtain a finished product.
Referring to fig. 2, step S1 of processing molten steel in a tundish through a mold 1 to obtain a casting blank with a liquid core includes:
molten steel in the tundish flows into the crystallizer 1 through the immersed nozzle, a blank shell with target thickness is formed through cooling of the crystallizer 1, meanwhile, the crystallizer 1 is vibrated at high frequency to realize blank shell demolding, and a casting blank with a liquid core moves forwards under the action of a driving roller blank pulling force. The crystallizer 1 can be a funnel-shaped crystallizer, the thickness of the outlet of the crystallizer 1 can be 100-160mm, and the width of a produced plate blank can be 1100-1600mm. The wide cooling water quantity of the crystallizer 1 is 6000-8600L/min, the narrow cooling water flow of the crystallizer 1 can be 400-600L/min, and the cooling water flow rate can be 10-13m/s.
Step S2, carrying out liquid core depressing 2 treatment on the casting blank with the liquid core through a secondary cooling fan-shaped section to obtain the casting blank with the target thickness, wherein the step S2 comprises the following steps: the casting blank with the liquid core enters a secondary cooling fan-shaped section after exiting the crystallizer 1, the liquid core of the casting blank with the liquid core is pressed down 2 in a number 0 fan-shaped section, a number 1 fan-shaped section and a number 2 fan-shaped section, the fan-shaped section is provided with a position sensor, the casting blank is pressed to the target thickness through position control, the total pressing amount is 5-20mm, wherein the position of an inlet of a zero number fan-shaped section is kept consistent with the position of an outlet of the crystallizer 1, and the casting blank is pressed down only in the position of the outlet.
Step S3, cooling the casting blank with the target thickness, and carrying out soft reduction 3 treatment on the solidification tail end to obtain an all-solid-state casting blank, wherein the step comprises the following steps:
Step S31: the casting blank with the liquid core passes through the arc section, is continuously bent and straightened into the horizontal section, and is continuously cooled by secondary cooling water, so that the liquid core of the casting blank with the liquid core gradually disappears;
Step S32: and (3) before the liquid phase in the casting blank with the liquid core completely disappears, carrying out soft reduction 3 treatment on the solidification tail end through the sector section to obtain the full-solid casting blank. The secondary cooling in the sector section is aerosol cooling, the specific water volume of the secondary cooling is 1.5-2.5L/kg, the pressure of the secondary cooling is 1.1-4.0bar, and the thickness of the casting blank after the casting blank is discharged out of the sector section is 90-135mm. The 3-volume under the light pressure of the solidification end is 3-5mm, and the solidification end is completed by 2-3 fan-shaped sections, wherein the solid-liquid fraction is 0.6-0.8 when the solidification end is under the light pressure of 3.
As shown in fig. 3 and 4, step S4 of subjecting an all-solid-state cast blank to a heavy reduction 4 treatment to obtain a thinned cast blank includes: after the all-solid-state casting blank is subjected to sector section, solid-state reduction is performed after the casting blank is subjected to heavy reduction device 5, the thickness of the casting blank is further reduced, and the running speed of the casting blank is improved, wherein the normal running speed of the casting blank after the casting blank is subjected to sector section is 4.5-6m/min. The casting machine is straight arc type, the radius of the casting machine is 5.5-6.0m, and the metallurgical length is 20-40m.
Example two
In this embodiment, by the method for online thinning casting blank of the continuous casting and rolling headless production line of the thin slab provided by the application, a typical common low carbon steel SPHC (specific composition is shown in the following table 1) is produced, the metallurgical length of the casting machine is 26m, the section specification of the cast slab is 1270 x 110mm, a funnel-type crystallizer is adopted, the thickness of the outlet of the crystallizer 1 is 130mm, molten steel in a tundish enters the crystallizer 1 through a 5-hole immersion nozzle, the superheat degree of the molten steel is 22 ℃, the cooling water quantity of the broad surface of the crystallizer 1 is 8380L/min, the cooling water quantity of the narrow surface is 550L/min, the vibration frequency of the crystallizer 1 is 350 times/min, and the normal production pull rate is 5.3m/min.
TABLE 1
| Steel grade | C | Si | Mn | P | S | Alt | Als |
| SPHC | 0.037 | 0.031 | 0.14 | 0.005 | 0.0013 | 0.039 | 0.037 |
The casting blank with the liquid core enters a secondary cooling vertical section after exiting the crystallizer 1, and the height of the vertical section is 3.54m. The inlet of the zero section is consistent with the outlet of the crystallizer 1, the opening degree is 130mm, the solidified blank shell is further pressed down by the zero section, the 1 section and the 2 section, the thickness of the 1 section outlet casting blank is 118.2mm, the casting blank moves forwards at a speed of 5.3m/min under the action of the blank pulling force of the fan-shaped section driving roller, the whole secondary cooling area is cooled by aerosol, the specific water quantity of secondary cooling is 2.3L/kg, and the pressure of the secondary cooling air is 1.5-3.5bar.
The casting blank enters a horizontal section after being bent and straightened, the position of a solidification liquid core is calculated, the solidification tail end is in sections 12 and 13, the two sections are respectively pressed down by 2mm, the roll gaps of the other sections are set according to solidification shrinkage, and the thickness of the casting blank is 110mm when the sections are discharged.
After the casting blank is subjected to sector section, the heavy-pressure reducing device 5 further reduces the solidified casting blank, the reduction is 20mm, the thickness of the casting blank is 90mm, the running speed of the casting blank is increased to 6.48m/min, and the casting blank enters a subsequent rolling mill for rolling at the speed.
Example III
In this embodiment, a typical Q235B component steel grade (specifically, table 2 below) is produced by the method for online thinning of a cast blank in a headless production line of continuous casting and rolling of a sheet billet provided by the present application. The metallurgical length of the casting machine is 26m, the section specification of a casting slab is 1500 multiplied by 120mm, a funnel-shaped crystallizer is adopted, the thickness of the outlet of the crystallizer 1 is 130mm, molten steel in a tundish enters the crystallizer 1 through a 5-hole submerged nozzle, and the superheat degree of the molten steel is 20 degrees. The cooling water quantity of the wide surface of the crystallizer 1 is 8250L/min, the cooling water quantity of the narrow surface is 539L/min, the vibration frequency of the crystallizer 1 is 343 times/min, and the normal production pulling speed is 4.8m/min.
TABLE 2
| Steel grade | C | Si | Mn | P | S | Alt | Als | N |
| Q235B | 0.041 | 0.18 | 0.75 | 0.006 | 0.0012 | 0.036 | 0.035 | 0.0048 |
The casting blank with the liquid core enters a secondary cooling vertical section after exiting the crystallizer 1, and the height of the vertical section is 3.54m. Wherein the inlet of the zero section is consistent with the outlet of the crystallizer 1, the opening degree is 130mm, the solidified blank shell is further pressed down by the section 0, the section 1 and the section 2, the thickness of the casting blank at the outlet of the section 2 is 125mm, the casting blank moves forwards at the speed of 4.8m/min under the action of the blank pulling force of the driving roller of the fan-shaped section, the whole secondary cooling area is cooled by aerosol, the specific water quantity of the secondary cooling is 2.0L/kg, and the pressure of the secondary cooling air is 1.2-3.5bar.
The casting blank enters a horizontal section after being bent and straightened, the position of a solidification liquid core is calculated, the solidification tail end is in 10 sections and 11 sections, the two sections are respectively pressed down by 1.5mm, the roll gaps of the other sections are set according to solidification shrinkage, and the thickness of the casting blank is 125mm when the sections are formed.
After the casting blank is subjected to sector section, the heavy-pressure reducing device 5 further reduces the solidified casting blank, the reduction is 15mm, the thickness of the casting blank is 110mm, the running speed of the casting blank is increased to 5.45m/min, and the casting blank enters a subsequent rolling mill for rolling at the speed. One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
1. The continuous casting and rolling endless production line for the thin slab is characterized in that a heavy pressing device is added at the outlet of the casting machine to further thin the casting blank on line, so that the running speed of the casting blank is improved, and the load of a subsequent rolling mill can be reduced.
2. The application can further increase the thickness of the outlet of the crystallizer and the production capacity of the headless production line by on-line thinning of the casting blank, and can be improved to 250-300 ten thousand tons/year on the basis of 200-220 ten thousand tons/year at present, thereby effectively improving the production capacity of the production line.
3. According to the application, through increasing the thickness of the casting blank at the outlet of the crystallizer, the inner cavity volume of the crystallizer can be effectively increased, the flow field and the temperature field in the crystallizer are more uniform, the casting powder melting and the fluctuation of the liquid level of the crystallizer can be controlled, the quality problems of slag rolling and the like can be remarkably reduced, and meanwhile, the incidence rate of malignant accidents such as steel leakage and the like can be reduced.
4. The application provides a novel process for the continuous casting and rolling production line of the sheet billet, has higher economic and social benefits, and provides a new direction for the future development of the headless production line.
Finally, it should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to make additional changes and modifications to the preferred embodiments of the invention once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (7)
1. A method for producing a thin slab continuous casting and rolling online thinned casting blank, which is characterized by comprising the following steps:
the molten steel in the tundish is treated by a crystallizer to obtain a casting blank with a liquid core;
carrying out liquid core depressing treatment on the casting blank with the liquid core through a secondary cooling fan-shaped section to obtain the casting blank with the target thickness;
cooling the casting blank with the target thickness, and performing soft reduction treatment on the solidified tail end to obtain an all-solid-state casting blank;
Carrying out heavy reduction treatment on the all-solid-state casting blank to obtain a thinned casting blank;
the thinned casting blank enters a rolling mill for rolling at a high pulling rate to obtain a finished product;
The casting blank with the liquid core enters a secondary cooling fan-shaped section after exiting the crystallizer, and liquid core pressing is carried out on the casting blank with the liquid core in fan-shaped sections 0, 1 and 2, wherein the total pressing amount is 5-20mm;
the light depression of the solidification tail end is 3-5mm and is completed by 2-3 sector sections, wherein the solid-liquid fraction of the solidification tail end under the light depression is 0.6-0.8;
and after the all-solid-state casting blank is subjected to sector section, solid-state reduction is carried out after the casting blank is subjected to heavy reduction device, the normal running speed of the casting blank after the casting blank is subjected to sector section is 4.5-6m/min, and the thickness of the slab before entering a rolling mill can be thinned by 10-30mm on the current basis.
2. The method for producing the thin slab continuous casting and rolling online thinned casting blank according to claim 1, which is characterized in that:
The crystallizer adopts a funnel-shaped crystallizer, and the thickness of an outlet of the crystallizer is 100-160mm so as to produce a slab with the width of 1100-1600 mm.
3. The method for producing the thin slab continuous casting and rolling online thinned casting blank according to claim 2, which is characterized in that:
The cooling water quantity of the broad face of the crystallizer is 6000-8600L/min, the cooling water flow rate of the narrow face of the crystallizer is 400-600L/min, and the cooling water flow rate is 10-13m/s.
4. A method for producing an on-line thin cast slab by continuous casting and rolling of a thin slab as claimed in claim 3, characterized in that:
The sector section is provided with a position sensor, and the casting blank is pressed to the target thickness through position control.
5. The method for producing an on-line thin cast slab as claimed in any one of claims 1 to 4, wherein the cooling of the cast slab of the target thickness and the soft reduction treatment at the solidification end to obtain an all-solid cast slab comprises:
The casting blank with the liquid core passes through the arc section, is continuously bent and straightened into the horizontal section, and is continuously cooled by secondary cooling water, so that the liquid core of the casting blank with the liquid core gradually disappears;
And before the liquid phase in the casting blank with the liquid core completely disappears, carrying out soft reduction treatment on the solidification tail end through the sector section to obtain the full-solid casting blank.
6. The method for producing the thin slab continuous casting and rolling online thinned casting blank according to claim 5, which is characterized in that:
The secondary cooling in the sector section is aerosol cooling, the specific water quantity of secondary cooling is 1.5-2.5L/kg, the pressure of secondary cooling is 1.1-4.0bar, and the thickness of the casting blank after the casting blank is out of the sector section is 90-135mm.
7. The method for producing the thin slab continuous casting and rolling online thinned casting blank according to claim 6, which is characterized in that:
the casting machine is in a straight arc shape, the radius of the casting machine is 5.5-6.0m, and the metallurgical length is 20-40m.
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