CN111992686B - Aerial fog full-water combined cooling high-carbon steel continuous casting production method - Google Patents
Aerial fog full-water combined cooling high-carbon steel continuous casting production method Download PDFInfo
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- CN111992686B CN111992686B CN202010917673.9A CN202010917673A CN111992686B CN 111992686 B CN111992686 B CN 111992686B CN 202010917673 A CN202010917673 A CN 202010917673A CN 111992686 B CN111992686 B CN 111992686B
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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
- B22D11/1245—Accessories for subsequent treating or working cast stock in situ for cooling using specific cooling agents
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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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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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
- B22D11/122—Accessories for subsequent treating or working cast stock in situ using magnetic fields
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Abstract
The invention discloses an aerial fog full-water combined cooling high-carbon steel continuous casting production method, which relates to the field of high-carbon steel continuous casting processes, wherein aerial fog full-water cooling equipment is used for multi-section cooling, full-water cooling is creatively adopted at the front section, aerial fog cooling is used at the rear section, and a set of unique aerial fog full-water combined cooling high-carbon steel continuous casting production process is formed by matching with the control of various production parameters.
Description
Technical Field
The invention relates to the field of high-carbon steel continuous casting process, in particular to an aerial fog full-water combined cooling high-carbon steel continuous casting production method.
Background
Carbon segregation of high-carbon steel is always one of the difficulties in continuous casting production, and the main contradiction is to reduce carbon segregation and avoid the conflict of other casting blank defects such as shrinkage porosity and shrinkage cavity. Methods to control center carbon segregation typically involve 1. using terminal electrical agitation; 2. controlling the superheat degree of the molten steel; 3. cooling with a large specific water amount; 4. pouring at constant drawing speed. The method for controlling the center carbon segregation is practiced in a plurality of domestic steel mills, and has obvious effect. In the case of large specific water cooling, the simple increase of the specific water in production practice can reduce the carbon segregation in the center of the casting blank and simultaneously cause other serious casting blank defects such as center crack of the casting blank. Therefore, the proper high-carbon steel secondary cooling water distribution system and the process are the technical core for ensuring the quality of the high-carbon steel casting blank.
Through patent search, related technologies for secondary cooling devices are disclosed:
the invention discloses a method for controlling the internal quality of a 82B steel type continuous casting billet in a steelmaking continuous casting process, which comprises the following steps: (1) strictly controlling the superheat degree of molten steel in the tundish, and controlling the superheat degree of the molten steel in the tundish to be 10-20 ℃; (2) optimizing the water quantity of the crystallizer and the water quantity of the secondary cooling ratio: 1) the water amount of the crystallizer is 95-110 m3/h, and the temperature difference between the inlet water temperature and the outlet water temperature of cooling water of the crystallizer is less than 10 ℃; 2) closing the cooling water of the secondary cooling 3 section; 3) adjusting the secondary cooling specific water amount to 0.35-0.52L/kg; 4) water is distributed in each section to ensure that the surface temperature of the continuous casting billet in the secondary cooling chamber is uniform; 5) optimizing the nozzles used in each section; (3) automatically controlling the liquid level of the molten steel in the crystallizer; (4) optimizing a water-cooling nozzle and water quantity to basically achieve that a small amount of water flows onto the red blank; (5) and optimizing the electromagnetic stirring parameters. According to the invention, through an optimized process, the internal defect rate of the 82B billet continuous casting billet is reduced to a lower level, and the quality of the 82B continuous casting billet is improved. The high-carbon steel produced by the prior art or the technical scheme described in the patent document still needs to be improved in internal quality, has a high carbon center segregation grade, and has other defects such as low shrinkage cavity and high shrinkage porosity grade of a casting blank, cracks and the like.
Disclosure of Invention
The invention provides an aerosol full-water combined cooling high-carbon steel continuous casting production method, and aims to solve the problems in the prior art.
The invention adopts the following technical scheme:
the method for producing high-carbon steel by continuously casting through combination cooling of all aerial fog and water is characterized by comprising the following steps of: (1) cooling the high-carbon steel by using air-mist full water cooling equipment; the cooling device of the aerial fog full-water cooling equipment cools a foot roller section of a crystallizer and a secondary cooling spraying section; specifically, the cooling device is divided into four sections, namely 0, I, II and III; wherein, the section 0 is fully water-cooled by three rows of PZ5965QZ nozzles, the section I is fully water-cooled by six rows of PZ4565QZ, the section II is gas-spray cooled by five rows of HPZ18060QZ, and the section III is gas-spray cooled by three rows of HPZ18060 QZ; (2) controlling the fluctuation of the liquid level of the crystallizer within +/-5 mm; (3) controlling the electromagnetic stirring parameters of the crystallizer to be 300-320A/4 HZ; (4) and electrically stirring the mixture by adopting the tail end to 90-120A/4 HZ.
Further, the following contents are included: according to the steel grade and the pouring condition, the water quantity control range of each secondary cooling section is as follows: carrying out high-speed dry top-bottom-up cultivation at a specific water content of 1.6-1.8L/kg, carrying out high-speed dry top-up cultivation at a stage 0 at 11-13 m, carrying out high-speed dry top-down cultivation at a stage I at 13-16 m, carrying out high-speed dry top-down cultivation at a stage II at 3-5 m, carrying out high-speed dry top-down cultivation at a stage III at 2-3 m; the air pressure of the section II and the air pressure of the section III are both controlled to be 0.25-0.3 MPa.
Further, the following contents are included: (5) producing high-carbon steel with a section of 160mm multiplied by 160mm by a two-continuous casting machine, wherein the carbon content is controlled to be 0.77-0.82%; (6) controlling the superheat degree of the molten steel of the tundish at 18-32 ℃; (7) controlling the pulling speed of the withdrawal and straightening machine to be 1.75-1.8 m/min.
From the above description of the structure of the present invention, it can be seen that the present invention has the following advantages:
the invention relates to a gas fog full-water cooling device, which is characterized in that gas fog full-water cooling equipment is used for multi-section cooling, the front section is used for full-water cooling, the rear section is used for gas fog cooling, and the control of various production parameters is matched to form a set of unique gas fog full-water combined cooling high-carbon steel continuous casting production process.
Drawings
Fig. 1 is a schematic structural diagram of an aerosol full-water cooling device in the invention.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
A high-carbon steel continuous casting production method adopting combination cooling of aerial fog and water comprises the following steps:
(1) the high-carbon steel with the section of 160mm multiplied by 160mm is produced by a two-continuous casting machine, and the carbon content is controlled to be 0.77-0.82 percent.
(2) Controlling the superheat degree of the molten steel in the tundish at 18-32 ℃.
(3) Cooling the high-carbon steel by using an air-mist full water cooling device.
As shown in fig. 1, the all-water aerial fog cooling equipment is a conventional equipment, and mainly comprises a support device 1, a guide device 2 and a cooling device 3. The cooling device 3 comprises a crystallizer foot roller section which is a section 0; also comprises a secondary cold spraying section which is divided into an I section 31, a II section 32 and a III section 33.
As shown in FIG. 1, segment 0 is fully water cooled with three rows of PZ5965QZ nozzles, segment I31 is fully water cooled with six rows of PZ4565QZ, segment II 32 is fully water cooled with five rows of HPZ18060QZ, and segment III 33 is fully water cooled with three rows of HPZ18060 QZ.
In addition, the water quantity control range of each secondary cooling section is as follows: carrying out high-speed dry top-bottom-up cultivation at a specific water content of 1.6-1.8L/kg, carrying out high-speed dry top-up cultivation at a stage 0 at 11-13 m, carrying out high-speed dry top-down cultivation at a stage I at 13-16 m, carrying out high-speed dry top-down cultivation at a stage II at 3-5 m, carrying out high-speed dry top-down cultivation at a stage III at 2-3 m; and the air pressure of the section II and the section III is controlled to be 0.25-0.3 MPa. Preferably, the water quantity control range of each secondary cooling section is as follows: carrying out high-yield high-; and the air pressure of the II section and the III section is controlled to be 0.28 MPa.
(4) Controlling the fluctuation of the liquid level of the crystallizer within +/-5 mm.
(5) Controlling the electromagnetic stirring parameters of the crystallizer at 300-320A/4 HZ. Preferably, the electromagnetic stirring parameter of the crystallizer is controlled to be 320A/4HZ
(6) And electrically stirring the mixture by adopting the tail end to 90-120A/4 HZ. Preferably, the terminal electric agitation is used for 110A/4 HZ.
(7) Controlling the pulling speed of the withdrawal and straightening machine to be 1.75-1.8 m/min. Preferably, the withdrawal speed of the withdrawal and straightening unit is controlled to be 1.75 m/min.
The high-carbon steel produced by the method has good internal quality, the low-power shrinkage cavity and shrinkage porosity of the casting blank are below 0.5 level, other defects such as cracks and the like do not exist, the proportion of the carbon center segregation grade above 1.15 is reduced from 22% to 2%, the quality of the high-carbon steel can be effectively improved, and the drawing wire breakage rate used by subsequent users is reduced.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (2)
1. The method for producing high-carbon steel by continuously casting through combination cooling of all aerial fog and water is characterized by comprising the following steps of: (1) cooling the high-carbon steel by using air-mist full water cooling equipment; the cooling device of the aerial fog full-water cooling equipment cools a foot roller section of a crystallizer and a secondary cooling spraying section; specifically, the cooling device is divided into four sections, namely 0, I, II and III; wherein, the section 0 is fully water-cooled by three rows of PZ5965QZ nozzles, the section I is fully water-cooled by six rows of PZ4565QZ, the section II is gas-spray cooled by five rows of HPZ18060QZ, and the section III is gas-spray cooled by three rows of HPZ18060 QZ; according to the steel grade and the pouring condition, the water quantity control range of each secondary cooling section is as follows: carrying out high-speed dry top-bottom-up cultivation at a specific water content of 1.6-1.8L/kg, carrying out high-speed dry top-up cultivation at a stage 0 at 11-13 m, carrying out high-speed dry top-down cultivation at a stage I at 13-16 m, carrying out high-speed dry top-down cultivation at a stage II at 3-5 m, carrying out high-speed dry top-down cultivation at a stage III at 2-3 m; the air pressure of the section II and the air pressure of the section III are both controlled to be 0.25-0.3 Mpa; (2) controlling the fluctuation of the liquid level of the crystallizer within +/-5 mm; (3) controlling the electromagnetic stirring parameters of the crystallizer to be 300-320A/4 HZ; (4) and electrically stirring the mixture by adopting the tail end to 90-120A/4 HZ.
2. The method for producing high-carbon steel through continuous casting through combination cooling of all aerial fog and water according to claim 1, characterized by further comprising the following steps: (5) producing high-carbon steel with a section of 160mm multiplied by 160mm by a two-continuous casting machine, wherein the carbon content is controlled to be 0.77-0.82%; (6) controlling the superheat degree of the molten steel of the tundish at 18-32 ℃; (7) controlling the pulling speed of the withdrawal and straightening machine to be 1.75-1.8 m/min.
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| CN113399640A (en) * | 2021-06-15 | 2021-09-17 | 首钢水城钢铁（集团）有限责任公司 | Method for improving quality of casting blank |
| CN114632918A (en) * | 2022-03-25 | 2022-06-17 | 福建三钢闽光股份有限公司 | Continuous casting high-drawing-speed production method of small square billets |
| CN116571707B (en) * | 2023-07-12 | 2023-09-12 | 江苏永钢集团有限公司 | Method for improving center shrinkage cavity quality of high-carbon steel continuous casting billet |
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