CN114734010A - Production method for thin slab continuous casting and rolling on-line casting blank thinning - Google Patents
Production method for thin slab continuous casting and rolling on-line casting blank thinning Download PDFInfo
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- 238000005266 casting Methods 0.000 title claims abstract description 163
- 238000005096 rolling process Methods 0.000 title claims abstract description 58
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 42
- 238000009749 continuous casting Methods 0.000 title claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 53
- 230000009467 reduction Effects 0.000 claims abstract description 50
- 238000001816 cooling Methods 0.000 claims abstract description 42
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 238000007711 solidification Methods 0.000 claims abstract description 18
- 230000008023 solidification Effects 0.000 claims abstract description 18
- 239000007787 solid Substances 0.000 claims abstract description 13
- 239000000498 cooling water Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000007791 liquid phase Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 9
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- 238000010924 continuous production Methods 0.000 description 3
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- 239000002184 metal Substances 0.000 description 2
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- 208000016261 weight loss Diseases 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 208000029154 Narrow face Diseases 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
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- 238000005272 metallurgy Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
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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
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Abstract
The invention discloses a production method for thin slab continuous casting and rolling on-line casting blank thinning, which is characterized by comprising the following steps: treating the molten steel in the tundish through a crystallizer to obtain a casting blank with a liquid core; carrying out liquid core reduction treatment on the casting blank with the liquid core through a secondary cooling fan-shaped section to obtain a casting blank with a target thickness; cooling the casting blank with the target thickness, and carrying out soft reduction treatment at the solidification tail end to obtain an all-solid casting blank; carrying out heavy reduction treatment on the all-solid-state casting blank to obtain a thinned casting blank; and (4) rolling the thinned casting blank in a rolling mill at a high drawing speed to obtain a finished product. The embodiment of the application provides a production method for thin slab continuous casting and rolling on-line casting blank thinning, solves the technical problem that the thickness of the casting blank cannot be continuously improved due to the limitation of the pulling speed of the existing endless production line, and improves the production capacity of the endless production line.
Description
Technical Field
The invention relates to the technical field of thin slab continuous casting and rolling, in particular to a production method for thinning a casting blank on line by thin slab continuous casting and rolling.
Background
The continuous casting and rolling endless rolling technology of the sheet billet integrates the dispersed continuous casting, heating, hot continuous rolling and other processes of the traditional process into a whole, and the process is simpler and more efficient. Because the casting blank is thickened, the blank drawing speed is improved, and the steel flux is greatly improved, the matched production of the uniflow continuous casting machine and the continuous rolling mill is realized. The endless rolling technology is industrially applied on an ESP production line of Italy Abdi for the first time in early 2009, and the endless rolling technology of Abdi is introduced into sunshine steel in 2013, so that the endless rolling technology shows a wider and wider development prospect along with continuous embodiment of the advantages of the endless rolling technology.
Considering from the process flow of continuous casting and rolling of thin slabs and in order to realize direct rolling of casting blanks and achieve the purpose of saving a large amount of energy, the thickness of the casting blanks needs to be limited within the range acceptable by continuous rolling, so that the technical and economic advantages of continuous casting and rolling can be fully exerted. From the point of view of continuous casting, the production of thin slabs places a burden on the mold and the submerged entry nozzle. If the thickness of the inner cavity of the crystallizer is too small, the insertion of a submerged nozzle is not facilitated, and a molten pool in the crystallizer is too small, the scouring of molten steel injection flow on a solidified blank shell is increased, the fluctuation of the molten steel level in the crystallizer is aggravated, the casting difficulty is increased, and therefore 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, prolong the service life of the submerged nozzle and provide a direct continuous rolling thin slab for a rolling mill, the continuous casting billet on-line thinning technology is widely adopted. At present, the MCCR production line adopts a fusion technology of liquid core pressure reduction and dynamic soft pressure reduction, namely, the liquid core pressure reduction is adopted at the outlet of a crystallizer, and the dynamic soft pressure reduction is adopted at the solidification tail end.
However, in the process of implementing the present application, the above-mentioned technology is found to have at least the following technical problems:
the MCCR fusion technology of liquid core reduction and dynamic soft reduction achieves the purposes of online casting blank thinning and internal quality improvement without influencing the service life of a sector section. However, due to the requirement of the endless production line on the pulling speed of the metal second flow casting machine, the further increase of the thickness of the casting blank is limited, the casting difficulty of the casting machine is increased, and the exertion of the production line capacity is influenced.
Disclosure of Invention
The embodiment of the application provides a production method for thin slab continuous casting and rolling on-line casting blank thinning, and solves the technical problem that the thickness of a casting blank cannot be continuously improved due to the limitation of the pulling speed of the existing endless production line.
The embodiment of the application provides a production method for thin slab continuous casting and rolling on-line casting blank thinning, which comprises the following steps:
treating molten steel in the tundish through a crystallizer to obtain a casting blank with a liquid core;
carrying out liquid core reduction treatment on the casting blank with the liquid core through a secondary cooling fan-shaped section to obtain a casting blank with a target thickness;
cooling the casting blank with the target thickness, and carrying out soft reduction treatment at the solidification tail end to obtain an all-solid casting blank;
carrying out heavy reduction treatment on the all-solid-state casting blank to obtain a thinned casting blank;
and (4) rolling the thinned casting blank in a rolling mill at a high drawing speed to obtain a finished product.
Further, the crystallizer adopts a funnel type crystallizer, the thickness of the outlet of the crystallizer is 100-.
Furthermore, the cooling water flow on the wide surface of the crystallizer is 6000-8600L/min, the cooling water flow on the narrow surface of the crystallizer is 400-600L/min, and the cooling water flow rate is 10-13 m/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 reduction treatment through a 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 liquid core reduction is carried out on the casting blank with the liquid core in No. 0, No. 1 and No. 2 fan-shaped sections, wherein the total reduction is 5-20 mm.
Furthermore, the sector 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 is kept consistent with the outlet position of the crystallizer, and the pressing is only carried out at the outlet position.
Further, the step of cooling the casting blank with the target thickness and performing soft reduction treatment at the solidification end to obtain an all-solid casting blank comprises the following steps:
the casting blank with the liquid core passes through the arc-shaped section, is continuously bent and straightened and enters the horizontal section, and the liquid core of the casting blank with the liquid core is gradually reduced and disappeared under the continuous cooling of secondary cooling water;
and before the liquid phase in the casting blank with the liquid core completely disappears, carrying out soft reduction treatment on the solidified tail end through a fan-shaped section to obtain an all-solid casting blank.
Further, secondary cooling in the fan-shaped section is aerial fog cooling, the secondary cooling specific water amount is 1.5-2.5L/kg, the secondary cooling air pressure is 1.1-4.0bar, and the thickness of the casting blank after being discharged from the fan-shaped section is 90-135mm after secondary cooling.
Further, the soft reduction of the solidification tail end is 3-5mm and is finished by 2-3 fan-shaped sections, wherein the solid-liquid fraction is 0.6-0.8 when the solidification tail end is in soft reduction.
Further, the step of obtaining a thinned casting blank after the all-solid casting blank is subjected to heavy reduction treatment comprises the following steps of:
after the all-solid-state casting blank is discharged out of the fan-shaped section, solid-state reduction is carried out after the all-solid-state casting blank passes through a heavy reduction device, and the normal running speed of the casting machine after the all-solid-state casting blank is discharged out of the fan-shaped section is 4.5-6 m/min.
Further, the casting machine is of a straight arc type, the radius of the casting machine is 5.5-6.0m, and the metallurgical length is 20-40 m.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the method, the aim of further thinning the casting blank is achieved by increasing the weight reduction treatment at the outlet of the continuous casting machine, the thickness of the plate blank before entering the rolling mill can be reduced by 10-30mm on the current basis, so that the running speed of the plate blank is increased, the load of the rolling mill is reduced, the requirements of endless production lines on the metal second flow and the pulling speed of the casting machine are met, meanwhile, the thickness of the outlet of the crystallizer can be increased, the volume of the inner cavity of the crystallizer can be effectively increased, the flow field and the temperature field in the crystallizer are more uniform, the melting of the casting powder and the control of the liquid level fluctuation of the crystallizer are facilitated, the quality problems of slag rolling and the like can be obviously reduced, the incidence rate of serious accidents such as steel leakage and the like is reduced, and the production capacity of the endless production line is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
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 thin slab caster in an embodiment of the present application;
FIG. 3 is a front view of the heavy press apparatus of the embodiment of the present application;
fig. 4 is a side view of a heavy press in an embodiment of the present application.
Detailed Description
In order to overcome the defects of the prior art, the application provides a method for thinning a casting blank on line by a thin slab continuous casting and rolling endless production line.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example one
As shown in fig. 1, an on-line thin slab casting and rolling method for a continuous casting and rolling endless production line according to an embodiment of the present 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 reduction treatment on the casting blank with the liquid core through a secondary cooling fan-shaped section to obtain a casting blank with a target thickness;
step S3: cooling the casting blank with the target thickness, and carrying out soft reduction treatment at the solidification 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 (4) feeding the thinned casting blank into a rolling mill at a high drawing speed for rolling to obtain a finished product.
Referring to fig. 2, the step S1 of processing the molten steel in the tundish by the mold 1 to obtain a casting blank with a liquid core includes:
molten steel in the tundish flows into the crystallizer 1 through the submerged nozzle, a blank shell with a target thickness is formed through cooling of the crystallizer 1, meanwhile, demoulding of the blank shell is realized through high-frequency vibration of the crystallizer 1, and a casting blank with a liquid core moves forwards under the action of a driving roller blank drawing force. The crystallizer 1 can adopt a funnel-type crystallizer, the outlet thickness of the crystallizer 1 can be 100-160mm, and the slab width can be 1100-1600 mm. The cooling water flow rate of the wide surface of the crystallizer 1 is 6000-8600L/min, the cooling water flow rate of the narrow surface of the crystallizer 1 is 400-600L/min, and the cooling water flow rate is 10-13 m/s.
Step S2, the casting blank with the liquid core is subjected to liquid core reduction 2 treatment through a secondary cooling fan-shaped section to obtain the casting blank with the target thickness, and the step comprises the following steps: and the casting blank with the liquid core enters a secondary cooling fan-shaped section after exiting the crystallizer 1, the casting blank with the liquid core is subjected to liquid core reduction 2 in fan-shaped sections 0, 1 and 2, the fan-shaped section is provided with a position sensor, the casting blank is pressed to a target thickness through position control, the total reduction is 5-20mm, wherein the inlet position of the fan-shaped section zero is kept consistent with the outlet position of the crystallizer 1, and the reduction is only carried out at the outlet position.
Step S3, cooling the casting blank with the target thickness, and carrying out soft reduction 3 treatment at the solidification end to obtain the all-solid casting blank, wherein the all-solid casting blank comprises the following steps:
step S31: the casting blank with the liquid core passes through the arc-shaped section, continuously bends and straightens the casting blank to enter the horizontal section, and the liquid core of the casting blank with the liquid core is gradually reduced and disappears under the continuous cooling of secondary cooling water;
step S32: and (3) carrying out soft reduction 3 treatment on the solidified tail end through a sector section to obtain an all-solid casting blank before the liquid phase in the casting blank with the liquid core completely disappears. The secondary cooling in the fan-shaped section is aerial fog cooling, the secondary cooling specific water amount is 1.5-2.5L/kg, the secondary cooling air pressure is 1.1-4.0bar, and the casting blank is cooled for the second time to be 90-135mm in thickness after being discharged from the fan-shaped section. The amount of 3 parts under the soft pressure of the solidification end is 3-5mm, and the solidification is completed through 2-3 fan-shaped sections, wherein the solid-liquid fraction is 0.6-0.8 when the solidification end is under the soft pressure of 3 parts.
As shown in fig. 3 and 4, the step S4 of obtaining a thinned casting slab after the fully solid casting slab is treated by the reduction by weight 4 includes: after the all-solid-state casting blank is discharged from the fan-shaped section, the casting blank is subjected to solid-state reduction through a heavy reduction device 5, the thickness of the casting blank is further reduced, and the running speed of the casting blank is increased, wherein the normal running speed of the casting machine after the casting machine is discharged from the fan-shaped section is 4.5-6 m/min. The casting machine is a straight arc type, the radius of the casting machine is 5.5-6.0m, and the metallurgical length is 20-40 m.
Example two
In the embodiment, a typical common low-carbon steel SPHC (specific components are shown in the following table 1) is produced by the method for online thinning the casting blank in the continuous casting and rolling production line of the sheet billet, the metallurgical length of the casting machine is 26m, the section specification of a cast slab is 1270 x 110mm, a funnel-shaped crystallizer is adopted, the outlet thickness of the crystallizer 1 is 130mm, molten steel in a tundish enters the crystallizer 1 through a 5-hole submerged nozzle, the superheat degree of the molten steel is 22 ℃, the wide-face cooling water amount of the crystallizer 1 is 8380L/min, the narrow-face cooling water amount is 550L/min, the vibration frequency of the crystallizer 1 is 350 times/min, and the normal production casting speed is 5.3 m/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 3.54 m. Wherein the inlet of the zero section is consistent with the outlet of the crystallizer 1, the opening degree is 130mm, the solidified shell is further reduced at the zero section, the 1 section and the 2 section, the thickness of the casting blank at the outlet of the 1 section is 118.2mm, the casting blank moves forwards at the speed of 5.3m/min under the action of the blank drawing force of the sector section driving roller, the whole secondary cooling area is cooled by gas spray, the water ratio of the secondary cooling area is 2.3L/kg, and the pressure of the secondary cooling air is 1.5-3.5 bar.
The casting blank enters a horizontal section after being bent and straightened, the position of a solidified liquid core is calculated, the solidified tail end is at 12 and 13 sections, the two fan-shaped sections are respectively reduced by 2mm, the roll gaps of the other fan-shaped sections are set according to the solidification shrinkage, and the thickness of the casting blank is 110mm when the casting blank is discharged from the fan-shaped sections.
After the casting blank is discharged from the sector section, the heavy reduction device 5 further reduces the solidified casting blank by 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 at the speed for rolling.
EXAMPLE III
In this embodiment, a typical Q235B steel grade (specifically, the following table 2) is produced by the method for online thinning a casting blank in a continuous casting and rolling continuous production line of a thin slab. The length of metallurgy of the casting machine is 26m, the section specification of a cast slab is 1500 multiplied by 120mm, a funnel-shaped crystallizer is adopted, the outlet thickness 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 4.8 m/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 3.54 m. Wherein the inlet of the zero section is consistent with the outlet of the crystallizer 1, the opening degree is 130mm, the solidified shell is further reduced at sections 0, 1 and 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 drawing force of the fan-shaped section driving roller, the whole secondary cooling area is cooled by gas spray, the secondary cooling specific water amount is 2.0L/kg, and the pressure of secondary cooling air is 1.2-3.5 bar.
The casting blank enters a horizontal section after being bent and straightened, the position of a solidified liquid core is calculated, the solidified tail end is at 10 and 11 sections, the two fan-shaped sections are respectively reduced by 1.5mm, the roll gaps of the other fan-shaped sections are set according to solidification shrinkage, and the thickness of the casting blank is 125mm when the casting blank exits from the fan-shaped sections.
After the casting blank is discharged from the sector section, the heavy reduction device 5 further reduces the solidified casting blank, the reduction amount 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 at the speed for rolling. One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1. the continuous casting and rolling continuous production line is aimed at a continuous casting and rolling continuous production line of a thin slab, and a casting blank is further thinned on line by increasing a weight reduction device at the outlet of a casting machine, so that the running speed of the casting blank is increased, and the load of a subsequent rolling mill can be reduced.
2. According to the method, the thickness of the outlet of the crystallizer can be further increased by thinning the casting blank on line, the production capacity of an endless production line can be further improved to 250-220 ten thousand tons/year on the basis of 200-220 ten thousand tons/year at present, and the production capacity of the production line is effectively improved.
3. According to the crystallizer, the volume of the inner cavity of the crystallizer can be effectively increased by increasing the thickness of the casting blank at the outlet of the crystallizer, the flow field and the temperature field in the crystallizer are more uniform, the melting of covering slag and the control of the fluctuation of the liquid level of the crystallizer are facilitated, the quality problems of slag rolling and the like can be remarkably reduced, and the incidence rate of serious accidents such as steel leakage and the like is reduced.
4. The application provides an original process for a thin slab continuous casting and rolling production line, has higher economic and social benefits, and provides a new direction for the future development of a headless production line.
Finally, it should be noted that the above detailed description is only intended to illustrate the technical solution of the present invention and not to limit it, and that, although preferred embodiments of the present invention have been described, further variations and modifications of these embodiments are possible to those skilled in the art once they learn of the basic inventive concept. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A production method for thinning a casting blank on line by continuous casting and rolling of a thin slab is characterized by comprising the following steps:
treating the molten steel in the tundish through a crystallizer to obtain a casting blank with a liquid core;
carrying out liquid core reduction treatment on the casting blank with the liquid core through a secondary cooling fan-shaped section to obtain a casting blank with a target thickness;
cooling the casting blank with the target thickness, and performing soft reduction treatment at the solidification tail end to obtain an all-solid casting blank;
carrying out heavy reduction treatment on the all-solid-state casting blank to obtain a thinned casting blank;
and feeding the thinned casting blank into a rolling mill at a high pulling speed for rolling to obtain a finished product.
2. The method for producing a thin slab continuous casting and rolling on-line thinned casting blank according to claim 1, characterized in that:
the crystallizer adopts a funnel type crystallizer, the thickness of the outlet of the crystallizer is 100-160mm, and slabs with the width of 1100-1600mm are produced.
3. The method for producing a thin slab continuous casting and rolling on-line thinned casting blank according to claim 2, characterized in that:
the cooling water flow on the wide surface of the crystallizer is 6000-8600L/min, the cooling water flow on the narrow surface of the crystallizer is 400-600L/min, and the cooling water flow rate is 10-13 m/s.
4. The method for producing a thin slab continuous casting and rolling on-line thinned casting slab according to claim 1, wherein the step of subjecting the casting slab with the liquid core to liquid core reduction treatment through a two-cooling segment to obtain a casting slab with a target thickness comprises:
and the casting blank with the liquid core enters a secondary cooling fan-shaped section after exiting the crystallizer, and liquid core reduction is carried out on the casting blank with the liquid core in No. 0, No. 1 and No. 2 fan-shaped sections, wherein the total reduction is 5-20 mm.
5. The method for producing a thin slab continuous casting and rolling on-line thinned casting blank according to claim 4, 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.
6. The method for producing a thin slab continuous casting and rolling on-line thinned cast slab according to any one of claims 1 to 5, wherein the step of cooling the cast slab of the target thickness and obtaining an all-solid cast slab after performing a soft reduction treatment at a solidification end comprises:
the casting blank with the liquid core passes through the arc-shaped section, continuously bends and straightens the casting blank to enter the horizontal section, and the liquid core of the casting blank with the liquid core is gradually reduced and disappears under the continuous cooling of secondary cooling water;
and before the liquid phase in the casting blank with the liquid core completely disappears, carrying out soft reduction treatment on the solidified tail end through a fan-shaped section to obtain an all-solid casting blank.
7. The method for producing a thin slab continuous casting and rolling on-line thinned casting blank according to claim 6, characterized in that:
the secondary cooling in the fan-shaped section is aerial fog cooling, the secondary cooling specific water amount is 1.5-2.5L/kg, the secondary cooling air pressure is 1.1-4.0bar, and the casting blank is cooled for the second time to be 90-135mm in thickness after leaving the fan-shaped section.
8. The method for producing a thin slab continuous casting and rolling on-line thinned casting blank according to claim 7, characterized in that:
the soft reduction of the solidification tail end is 3-5mm, and the solidification is finished by 2-3 fan-shaped sections, wherein the solid-liquid fraction is 0.6-0.8 when the solidification tail end is under soft reduction.
9. The method for producing the thin slab continuous casting and rolling on-line thinned casting blank according to claim 8, wherein the step of subjecting the all-solid-state casting blank to the heavy reduction treatment to obtain a thinned casting blank comprises the steps of:
after the all-solid-state casting blank is discharged out of the fan-shaped section, solid-state reduction is carried out after the all-solid-state casting blank passes through a heavy reduction device, and the normal running speed of the casting machine after the all-solid-state casting blank is discharged out of the fan-shaped section is 4.5-6 m/min.
10. The method for producing a thin slab continuous casting and rolling on-line thinned casting blank according to claim 9, characterized in that:
the casting machine is of a straight arc type, the radius of the casting machine is 5.5-6.0m, and the metallurgical length is 20-40 m.
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