CN114734013A - Casting blank reconnection method for continuous casting machine - Google Patents
Casting blank reconnection method for continuous casting machine Download PDFInfo
- Publication number
- CN114734013A CN114734013A CN202210441686.2A CN202210441686A CN114734013A CN 114734013 A CN114734013 A CN 114734013A CN 202210441686 A CN202210441686 A CN 202210441686A CN 114734013 A CN114734013 A CN 114734013A
- Authority
- CN
- China
- Prior art keywords
- crystallizer
- molten steel
- tundish
- pouring
- drainage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005266 casting Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000009749 continuous casting Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 40
- 239000010959 steel Substances 0.000 claims abstract description 40
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 9
- 239000001301 oxygen Substances 0.000 claims abstract description 9
- 239000002699 waste material Substances 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
-
- 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
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a method for reconnection of casting blanks of a continuous casting machine, which comprises the following steps: stopping pouring of the conventional tundish, placing at least 1 connecting piece in the crystallizer, bonding 2/3 parts of the connecting pieces with the unset molten steel in the crystallizer, and bonding 1/3 parts of the connecting pieces with the tundish to be poured; throwing waste at the front and back 2m of the joint with the connecting piece without participating in rolling, and carrying out furnace returning treatment on the waste; before the pouring tundish is poured, checking the pouring tool and placing the pouring tool on the cover plate; checking the blind block and confirming the pressure of each medium; after the ladle is cast, if the molten steel does not flow automatically, the thin oxygen tube is used for drainage, and the length of the thin oxygen tube inserted into the drainage tube is more than 15cm, and the drainage is finished; starting vibration, setting the vibration to be 0.3m/min, injecting molten steel into a crystallizer, and starting the pulling speed until the liquid level is stable; after the connecting piece is used, operation accidents can be effectively avoided; the method avoids accidental production accidents caused by heat exchange, pulling-out or steel leakage; the influence of mixed components of casting blanks at the joint is reduced, the length of the joint blanks is shortened, and the operation rate and the metal yield of a casting machine are improved.
Description
Technical Field
The invention belongs to the technical field of smelting continuous casting, and particularly relates to a method for reconnection of a casting blank of a continuous casting machine.
Background
Continuous casting is an important link in steel production, and a production process for continuously casting high-temperature molten steel into a casting blank with a certain size and a certain section is called continuous casting steel. In the production process of a continuous casting machine, whether the continuous casting machine can normally and continuously produce becomes a key element, and whether the continuous casting machine can directly influence the whole production line.
In order to improve the yield of molten steel and the operating rate, a tundish quick-change technology is generally adopted in the production process. The reconnection of the steel billet is generally only generated in the ladle exchanging process of the tundish, and the casting stopping time exists in the two tundish exchanging processes, so that the molten steel of the previous ladle is excessively cooled in the crystallizer, the connection with the molten steel of the next ladle is not good, and the reconnection is generated. If the tundish is not replaced, the reconnection is generally caused by the fact that molten steel flows into a gap between the billet shell and the crystallizer due to excessive shrinkage of the billet shell.
In the normal tundish heat exchange operation process, parts are prevented from being damaged due to overheating through equipment protection, pulse water is started to cool the equipment, if the delay time in the heat exchange process is too long, a casting blank in a crystallizer is frozen, molten steel does not separate from molten steel in the next ladle, the casting blank in the crystallizer cannot be connected, continuous pouring cannot be performed, the casting blank in the crystallizer generally separates from molten steel added into the crystallizer later or steel leakage can be caused, production accidents can be caused seriously, potential safety hazards exist in personnel operation, and continuous operation production conditions are restricted seriously.
Disclosure of Invention
The invention aims to provide a method for reconnection of a casting blank of a continuous casting machine.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for reconnection of a casting blank of a continuous casting machine comprises the following steps:
1) stopping pouring of the conventional tundish, placing at least 1 connecting piece in the crystallizer, bonding 2/3 parts of the connecting pieces with the unset molten steel in the crystallizer, and bonding 1/3 parts of the connecting pieces with the tundish to be poured;
2) throwing waste at the front and back 2m of the joint with the connecting piece without participating in rolling, and carrying out furnace returning treatment on the waste;
3) before the pouring tundish is poured, checking the pouring tool and placing the pouring tool on the cover plate;
4) checking the blind block and confirming the pressure of each medium;
5) after the ladle is cast, if the molten steel does not flow automatically, the thin oxygen tube is used for drainage, and the length of the thin oxygen tube inserted into the drainage tube is more than 15cm, and the drainage is finished;
6) starting vibration, setting the vibration to be 0.3m/min, injecting molten steel into a crystallizer, and starting the pulling speed until the liquid level is stable.
Specifically, the medium pressure is 0.8MPa to 1.2MPa of crystallizer water pressure, the water flow range of a copper pipe of a crystallizer of the machine is 2300L/min to 3000L/min, the secondary cooling water pressure is 0.8MPa to 1.2MPa and 3, the equipment water pressure is 0.6MPa to 0.8MPa, the normal blank drawing pressure is 3.0MP to 5.0MPa, and the high pressure is 12.0MPa to 15.0 MPa.
Specifically, the connecting piece is phi 30 deformed steel bar material, and length is 500mm, and both ends are the U type.
In particular, the angle between the connecting piece and the crystallizer is 90 °.
The invention has the following beneficial effects:
1) after the connecting piece is used, the position of the casting blank in the crystallizer can be conveniently and visually judged, and operation accidents can be effectively avoided;
2) the quick heat exchange of the continuous casting machine can be realized, and the steel yield in the stand-by process is improved;
3) the method can avoid accidental production accidents caused by heat exchange, pulling-off or steel leakage;
4) the influence of mixed components of casting blanks at the joint is reduced, the length of the joint blank is shortened, and the operation rate and the metal yield of a casting machine are further improved;
5) in the operation process, the connecting piece does not need to be taken out and can be directly melted into molten steel.
Detailed Description
The present invention will now be described in further detail.
The method for reconnection of the casting blank of the continuous casting machine is characterized by comprising the following steps of:
1) firstly, stopping pouring of a previous tundish, and inserting a self-made connecting piece with the length of 500mm into unset molten steel in a crystallizer; placing one or more connecting pieces in the crystallizer, adhering the connecting pieces with unset molten steel in the crystallizer, operating a speed regulator to pull each tail blank down to be about 300-350 mm above a lower opening of the crystallizer, placing a connecting piece 2/3 in the molten steel in the crystallizer to adhere and solidify the molten steel, adhering an exposed part with the next tundish to be poured, throwing waste at the front and back 2m of a reconnection part without participating in rolling, and carrying out furnace returning treatment on the waste;
2) before operation, a slag fishing rod, a thin oxygen pipe, a hook, an oil pipe and a crowbar used for casting are firstly checked and placed on a cover plate;
3) the blind block is checked, the model of the spare sliding block is correct, and the appearance quality is not defective;
4) confirming that the pressure of each medium is normal (the water pressure of the crystallizer is 0.8-1.2 Mpa, and the water flow range of the copper pipe of the crystallizer is 2300-3000L/min. The secondary cooling water pressure is 0.8-1.2 MPa, the 3-equipment water pressure is 0.6-0.8 MPa, the normal blank drawing pressure is 3.0-5.0 MPa, and the high pressure is 12.0-15.0 MPa);
5) after the ladle is cast, if the molten steel does not flow automatically, the thin oxygen tube is used for drainage, and the length of the thin oxygen tube inserted into the drainage tube is more than 15cm, and the drainage is finished;
6) starting vibration, setting the vibration to be 0.3m/min, injecting molten steel into a crystallizer, and starting the pulling speed until the liquid level is stable.
Wherein the connecting piece body is
The screw-thread steel material, 500mm long both ends are the U type, increase with the molten steel area of contact, the firm contact of being convenient for, and the connecting piece chemical composition is similar with the chemical composition of the molten steel that waits to be poured, and the angle of connecting piece is about 90 in the crystallizer.
This patent is used for firmly solidifying with the molten steel through placing one or more connecting pieces in the crystallizer the inside, places in the crystallizer and carries out "cover hand" with the molten steel, and the material is easily acquireed, uses special bender to buckle and has increased and reduce production accident probability with molten steel area of contact.
The method is simple and effective, can quickly finish operation, is convenient to observe the position of the casting blank in the crystallizer, and optimizes the success rate of reconnection; the problems that production is continued after abnormal production flow blockage is intervened manually, steel grade replacement is not stopped, the success rate of casting is started again, gas consumption and carbon emission are caused by baking the tundish belt again, the casting blank is broken due to poor reconnection, the frozen blank cannot be reconnected due to long tundish replacement time and the like are solved.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (4)
1. The method for reconnection of the casting blank of the continuous casting machine is characterized by comprising the following steps of:
1) stopping pouring of the conventional tundish, placing at least 1 connecting piece in the crystallizer, bonding 2/3 parts of the connecting pieces with the unset molten steel in the crystallizer, and bonding 1/3 parts of the connecting pieces with the tundish to be poured;
2) throwing waste at the front and back 2m of the joint with the connecting piece without participating in rolling, and carrying out furnace returning treatment on the waste;
3) before the pouring tundish is poured, checking the pouring tool and placing the pouring tool on the cover plate;
4) checking the blind block and confirming the pressure of each medium;
5) after the ladle is cast, if the molten steel does not flow automatically, the thin oxygen tube is used for drainage, and the length of the thin oxygen tube inserted into the drainage tube is more than 15cm, and the drainage is finished;
6) starting vibration, setting the vibration to be 0.3m/min, injecting molten steel into a crystallizer, and starting the pulling speed until the liquid level is stable.
2. The method for reconnecting casting blank of continuous casting machine according to claim 1, wherein the pressure of each medium is crystallizer water pressure 0.8Mpa-1.2Mpa, the water flow range of machine crystallizer copper pipe 2300L/min-3000L/min, secondary cooling water pressure 0.8Mpa-1.2Mpa,3, equipment water pressure 0.6Mpa-0.8Mpa, normal blank drawing pressure 3.0 MP-5.0 Mpa, high pressure 12.0Mpa-15.0 Mpa.
3. The method of claim 1, wherein the connecting member is phi 30 deformed steel bar, has a length of 500mm, and is U-shaped at both ends.
4. The method of claim 1, wherein the angle between the connecting member and the mould is 90 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210441686.2A CN114734013A (en) | 2022-04-25 | 2022-04-25 | Casting blank reconnection method for continuous casting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210441686.2A CN114734013A (en) | 2022-04-25 | 2022-04-25 | Casting blank reconnection method for continuous casting machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114734013A true CN114734013A (en) | 2022-07-12 |
Family
ID=82283009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210441686.2A Pending CN114734013A (en) | 2022-04-25 | 2022-04-25 | Casting blank reconnection method for continuous casting machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114734013A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206445190U (en) * | 2017-01-17 | 2017-08-29 | 河钢股份有限公司承德分公司 | A kind of tundish quick change strand attachment means |
| CN108817341A (en) * | 2018-07-18 | 2018-11-16 | 中天钢铁集团有限公司 | Conticaster reduces the method that pulling rate improves quick change success rate |
| CN112387946A (en) * | 2020-11-17 | 2021-02-23 | 山东莱钢永锋钢铁有限公司 | Device and method for continuous casting of small square billets |
| CN113020559A (en) * | 2021-03-01 | 2021-06-25 | 重庆钢铁股份有限公司 | Continuous casting tundish reopening process |
| CN113042726A (en) * | 2021-03-11 | 2021-06-29 | 天津市新天钢钢铁集团有限公司 | Method for treating steel channeling between slab continuous casting quick-change water gap plates |
| CN113145810A (en) * | 2021-02-01 | 2021-07-23 | 南京钢铁股份有限公司 | Operation method for preventing steel infiltration of continuous slab casting butt joint billet |
| CN113996772A (en) * | 2021-11-04 | 2022-02-01 | 攀钢集团江油长城特殊钢有限公司 | Preparation method of 95Cr18 |
-
2022
- 2022-04-25 CN CN202210441686.2A patent/CN114734013A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206445190U (en) * | 2017-01-17 | 2017-08-29 | 河钢股份有限公司承德分公司 | A kind of tundish quick change strand attachment means |
| CN108817341A (en) * | 2018-07-18 | 2018-11-16 | 中天钢铁集团有限公司 | Conticaster reduces the method that pulling rate improves quick change success rate |
| CN112387946A (en) * | 2020-11-17 | 2021-02-23 | 山东莱钢永锋钢铁有限公司 | Device and method for continuous casting of small square billets |
| CN113145810A (en) * | 2021-02-01 | 2021-07-23 | 南京钢铁股份有限公司 | Operation method for preventing steel infiltration of continuous slab casting butt joint billet |
| CN113020559A (en) * | 2021-03-01 | 2021-06-25 | 重庆钢铁股份有限公司 | Continuous casting tundish reopening process |
| CN113042726A (en) * | 2021-03-11 | 2021-06-29 | 天津市新天钢钢铁集团有限公司 | Method for treating steel channeling between slab continuous casting quick-change water gap plates |
| CN113996772A (en) * | 2021-11-04 | 2022-02-01 | 攀钢集团江油长城特殊钢有限公司 | Preparation method of 95Cr18 |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220712 |
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| RJ01 | Rejection of invention patent application after publication |