CN115106487A - Method for placing cold material of ultra-large-specification continuous casting round billet seal dummy ingot - Google Patents
Method for placing cold material of ultra-large-specification continuous casting round billet seal dummy ingot Download PDFInfo
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- CN115106487A CN115106487A CN202210525003.1A CN202210525003A CN115106487A CN 115106487 A CN115106487 A CN 115106487A CN 202210525003 A CN202210525003 A CN 202210525003A CN 115106487 A CN115106487 A CN 115106487A
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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
- B22D11/08—Accessories for starting the casting procedure
- B22D11/081—Starter bars
- B22D11/083—Starter bar head; Means for connecting or detaching starter bars and ingots
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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
- B22D11/08—Accessories for starting the casting procedure
- B22D11/088—Means for sealing the starter bar head in the moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
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- Continuous Casting (AREA)
Abstract
The invention relates to a method for placing cold materials of a super-large-specification continuous casting round billet seal dummy ingot, which comprises the following steps: feeding the dummy bar head into the crystallizer to a casting starting position, and filling a sealing rope into a gap between the crystallizer and the dummy bar head; uniformly paving a layer of scrap iron on the dummy ingot head; then placing the casting plug into the inner cavity of the crystallizer and connecting the casting plug with a dummy bar head; uniformly spreading a layer of scrap iron in the integrated material column above the plug, placing cold strips and cold materials with proper weight calculated by heat balance according to a certain arrangement rule, and reserving a central position. By adopting the method, safe and stable casting starting operation under the manual operation condition of the continuous casting round billet with the phi 1200mm specification is successfully realized, 100% casting starting success is ensured, production and equipment losses caused by accidents of bumping and breaking a dipping water gap, casting steel leakage, pulling and stripping and the like due to improper cold charge placement in the casting starting process are avoided, meanwhile, the inner wall of the copper pipe of the crystallizer is prevented from being scratched due to improper cold strip placement, and the surface quality of the casting blank is ensured.
Description
Technical Field
The invention relates to a method for placing cold materials of a super-large-specification continuous casting round billet seal dummy ingot. Belongs to the technical field of ferrous metallurgy continuous casting and casting.
Background
The casting operation of the continuous casting machine refers to the operation within the time that the molten steel reaches the casting platform until the molten steel is injected into the crystallizer and the throwing speed is switched to normal. The casting operation is fast and stable. The steel ladle and the tundish are fast to be in place, the steel ladle is fast to be cast, and the temperature loss of molten steel is reduced. The pouring of the tundish is stable, the withdrawal and straightening machine is stable to start, and the crystallizer is prevented from steel leakage during pouring. Starting the withdrawal and straightening machine is the starting of a continuous casting machine; starting from the time when molten steel is injected into the crystallizer to the time when the withdrawal and straightening machine is started; the take off time is also referred to as the "emergence" time.
The casting operation of the continuous casting machine is mainly divided into ingot sealing operation, seedling emergence operation and speed raising operation.
1. And sealing the dummy ingot. When planning that molten steel arrives at a station, starting to block the dummy ingot by using an asbestos rope, and tightly blocking and leveling the lake image around the space between the dummy ingot head and the crystallizer by using the asbestos rope; when the temperature of the molten steel reaches the platform, iron nail scraps are uniformly spread on the dummy ingot head according to the thickness of 20-30 mm; then, flat irons are crossly placed on the iron nail scraps according to the regulations; and finally, uniformly coating rapeseed oil on the wall of the crystallizer.
2. And (5) seedling emergence operation. After the large ladle is opened, the seedling emergence operation is started when the molten steel amount of the tundish is injected to about 1/2. The early stage steel flow is required to be small during seedling emergence, so that washing of flat iron and iron nail scraps is avoided, meanwhile, an operator blocks the steel flow at two sides of a water gap by using a slag dragging rake, steel hanging of a crystallizer is avoided, and seedling emergence time is generally within the range of 30-50s according to the requirements of steel types and sections.
3. And (4) accelerating operation. After the seedling emergence, starting from zero according to the standard pulling speed and uniformly increasing the speed. A typical pull rate is reached around 120 s.
The large section round billet continuous casting machine has the advantages that the larger the section is, the higher the dummy ingot sealing difficulty is, and the higher the casting failure risk is. The failure of casting has great influence on the smooth operation of production, equipment maintenance, accident disposal and the like, and great loss is caused to enterprises. In order to break through the limitation of the specification of the continuous casting round billet, stabilize the production process and reduce the accident loss, the existing continuous casting sealing dummy ingot operation mode needs to be improved to ensure that the casting success rate of the ultra-large specification phi 1200mm round billet continuous casting machine is 100 percent.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for placing the cold material of the sealed dummy ingot of the ultra-large specification continuous casting round billet aiming at the prior art, realize the process design for placing the cold material of the sealed dummy ingot of the phi 1200mm specification continuous casting round billet for the first time, and effectively solve the problem of casting failure caused by wrong dummy ingot sealing which often occurs in casting under a manual mode.
The technical scheme adopted by the invention for solving the problems is as follows: a method for placing cold materials of a super-large-specification continuous casting round billet seal dummy ingot comprises the following steps:
1) the semi-open dummy bar head (1) is sent into a crystallizer (2) to a casting starting position, and then a gap between the crystallizer and the dummy bar head is filled with a sealing rope (3);
2) uniformly paving a layer of scrap iron on the dummy ingot head;
3) placing the casting plug (4) into an inner cavity of the crystallizer and connecting the casting plug with a dummy bar head;
4) uniformly paving a layer of scrap iron in an integrated material column (5) at the upper part of the plug, putting a cold strip (6) and a cold material (7) which calculate the weight according to the heat balance in a certain arrangement sequence, and reserving the position of the center of the plug.
Preferably, the semi-open dummy bar head (1) in the step 1) is connected with the casting plug (4) in the step 3) through a joint, so that blank drawing and dummy bar stripping are facilitated.
Preferably, in the step 2) and the step 4), the thickness of the scrap iron is 0.5-1.0 cm.
Preferably, in the step 3), the casting plug is made of steel, and the diameter of the casting plug is 4-10 cm smaller than the inner diameter of the copper pipe of the crystallizer; the material fence that the welding has the sheet iron of integral type to enclose in end cap top, conveniently places cold strip and cold burden.
Preferably, in the step 4), the cold bars and the cold materials are respectively steel bars and springs with proper length and size, the surfaces of the cold bars and the cold materials are free of oil stains or water stains, and the cold bars and the cold materials are regularly and regularly arranged on the plug according to the sequence specification of 'laying the cold bars obliquely after iron chips at first and then laying the cold bars at last'.
Preferably, the usage amount of the cold strips and the cold materials is calculated according to the following rule:
according to the heat balance principle, the heat released by the molten steel is equal to the heat absorbed in the crystallizer, and if the primary molten steel injected around the connecting piece is completely solidified when the casting is started, the released heat is as follows:
Q put ＝M Molten steel ·L Steel ；
In the formula, Q Put : heat released by the molten steel, kJ; m Molten steel : mass of molten steel, kg; l is Steel : latent heat of melting of steel; ρ: the density of the molten steel; d: diameter of cross section, m; l: height of molten steel in the crystallizer, m;
the heat released by the solidification of the molten steel is absorbed by primary cooling of the crystallizer and cold strips and cold materials, wherein the heat taken away by the primary cooling of the crystallizer is calculated as follows:
Q suction knot ＝M Water (W) ·C Water (W) ·ΔT 1 ；
In the formula, Q Suction knot : the heat absorbed by the crystallizer in primary cooling, kJ; m Water (W) : the pouring time period is the mass of cold water in kg; c Water (W) : specific heat capacity of water, 4.2 kJ/(kg. DEG C); delta T 1 : the temperature difference of crystallizer water is DEG C;
and the heat absorbed by the iron rod and the cooling spring added on the connecting piece is as follows:
Q cold absorption ＝M Cooling by cooling ·C·ΔT+M Cold ·L Steel ；
In the formula, Q Cold absorption : cold strip and cold steel absorptionHeat of (a), kJ; m Cold : mass of cold bars and cold charge, kg; c: the specific heat capacity of the cold bar and the cold charge; Δ T: temperature increase of cold bars and cold charge;
when the mass of the cold strip and the cold charge exceeds the calculated value, the heat released by the solidification of the molten steel can be cooled once by the crystallizer and the cold charge of the cold strip can be completely absorbed.
Preferably, in step 4), when placing the cold strip and the cold material, attention is paid to the fact that the center position is empty, and a certain space is left for the immersion nozzle to prevent the cold strip and the cold material from being folded during the centering process.
Compared with the prior art, the invention has the advantages that:
the invention realizes safe and stable casting starting operation under the manual operation condition of the phi 1200mm specification continuous casting round billet, ensures 100 percent of casting starting success, avoids production and equipment loss caused by accidents of bumping and breaking a dipping water gap, casting steel leakage, pulling and falling and the like due to improper placement of cold materials in the casting starting process, simultaneously avoids scratching of the inner wall of the copper pipe of the crystallizer due to improper placement of cold strips, and ensures the surface quality of the casting blank.
Description of the drawings:
fig. 1 is a cross-sectional view of the present invention.
Fig. 2 is a top view of the present invention.
Description of reference numerals: 1, dummy ingot head; 2, a crystallizer; 3, sealing the rope; 4, casting a plug; 5, a material basket; 6, cooling; and 7, cooling.
Detailed Description
The present invention will be further described with reference to examples.
Example 1
A process design applied to cold charge placement of a phi 1200mm oversized continuous casting round billet seal dummy ingot is provided, and the method comprises the following steps:
1) sending the semi-open dummy bar head into a crystallizer to a casting starting position, and filling a sealing rope into a gap between the crystallizer and the dummy bar head;
2) uniformly paving a layer of scrap iron on the dummy ingot head;
3) placing the casting plug into the inner cavity of the crystallizer and connecting the casting plug with a dummy bar head;
4) uniformly laying a layer of scrap iron in the integrated material column on the upper part of the plug, putting cold strips and cold materials with the weight calculated through thermal balance according to a certain arrangement sequence, and reserving the position of the center of the plug.
The weight of the cold strip and the cold material is calculated according to formulas I to IV, the height l of the molten steel of the cold material without the cold strip in the crystallizer is 250mm, and the heat quantity released when the primary molten steel around the connecting piece is completely solidified is about 240462 kJ. The quality of the cold water during casting can be calculated by the water flow (L/min) of the crystallizer multiplied by the casting time (min) in the casting time. Q is calculated according to the flow rate of primary cold water of the crystallizer of 3500L/min, the starting time from pouring to the withdrawal and straightening machine of 360s and the water temperature difference of 2.0 DEG C Cold absorption 176400 kJ. Therefore, the cold strip and the cold material absorb heat Q Suction knot 64062 kJ. The temperature increase of the cold bars and cold charge was calculated as 1500 ℃. Assuming that the added iron rod and cooling spring are all melted, the weight of the cold bar and cold material absorbing the heat of the initial molten steel is at least:
M cold ＝44kg
The method is implemented on site in a certain steel production enterprise in China, the dummy ingot sealing operation time is about 20min, the cold material consumption of the cold strips is about 48 kg/flow, the production is carried out for many times, the casting success rate of each flow is 100%, and after the dummy ingot is removed in production, the head is checked to have no cold strips scattered and part of the cold strips are not melted. Practice proves that the method is reliable and effective.
Example 2
A process design for sealing dummy ingot cold burden placement applied to a large-size continuous casting round billet with the diameter of 1000mm comprises the following steps:
1) feeding the semi-open dummy bar head into a crystallizer to a casting starting position, and filling a sealing rope into a gap between the crystallizer and the dummy bar head;
2) uniformly paving a layer of scrap iron on the dummy ingot head;
3) placing the casting plug into the inner cavity of the crystallizer and connecting the casting plug with a dummy bar head;
4) uniformly paving a layer of scrap iron in the integrated material fence at the upper part of the plug, putting cold strips and cold materials in a certain arrangement sequence, and reserving the center of the plug.
The weight of cold strip and cold material is according to the formula (I) - (IV), the crystallizer has no cold stripThe height l of the molten steel of the cold charge is 250mm, and the heat quantity released when the initial molten steel around the connecting piece is completely solidified is about 166987 kJ. The quality of cold water during casting can be calculated by the water flow of the crystallizer within the casting time multiplied by the casting time. Q is calculated according to the flow rate of primary cold water of the crystallizer of 3200L/min, the starting time from pouring to the withdrawal and straightening machine of 300s and the water temperature difference of 1.8 DEG C Cold absorption 120960 kJ. Therefore, the cold strip and the cold material absorb heat Q Suction knot 46028 kJ. The temperature increase of the cold bars and cold charge was calculated as 1500 ℃. Assuming that the added iron rod and cooling spring are all melted, the weight of the cold bar and cold material absorbing the heat of the initial molten steel is at least:
M cold ＝32kg
The method is implemented on site in a certain steel production enterprise in China, the dummy ingot sealing operation time is about 17min, the cold material consumption of the cold strips is about 35 kg/flow, the production is carried out for many times, the casting success rate of each flow is 100%, and after the dummy ingot is removed in production, the head is checked to have no cold strips scattered and part of the cold strips are not melted. Practice proves that the method is reliable and effective.
Although preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for placing cold materials of a super-large-specification continuous casting round billet seal dummy ingot is characterized by comprising the following steps:
1) the semi-open dummy bar head (1) is sent into a crystallizer (2) to a casting starting position, and then a gap between the crystallizer and the dummy bar head is filled with a sealing rope (3);
2) uniformly paving a layer of scrap iron on the dummy ingot head;
3) placing the casting plug (4) into an inner cavity of the crystallizer and connecting the casting plug with a dummy bar head;
4) uniformly paving a layer of scrap iron in an integrated material column (5) at the upper part of the plug, putting a cold strip (6) and a cold material (7) which calculate the weight according to the heat balance in a certain arrangement sequence, and reserving the position of the center of the plug.
2. The method for placing the cold material of the ultra-large continuous casting round billet seal dummy ingot according to the claim 1, characterized in that the semi-open type dummy ingot head (1) in the step 1) is connected with the casting start plug (4) in the step 3) through a joint, so that the blank drawing and the dummy ingot removal are convenient.
3. The method for placing the seal dummy ingot cold burden of the ultra-large continuous casting round billet according to the claim 1, characterized in that in the step 2) and the step 4), the thickness of the scrap iron is 0.5-1.0 cm.
4. The method for placing the cold charge of the ultra-large continuous casting round billet seal dummy ingot according to claim 1, characterized in that in the step 3), the casting plug is made of steel, and the diameter size of the casting plug is 4-10 cm smaller than the inner diameter of a copper pipe of a crystallizer; the material fence that the welding has the sheet iron of integral type to enclose in end cap top, conveniently places cold strip and cold burden.
5. The method for placing the cold material of the seal dummy ingot of the oversized continuous casting round billet according to claim 1, wherein in the step 4), the cold bars and the cold material are respectively steel bars and springs with proper length and size, the surfaces of the cold bars and the cold material are free of oil stain or water stain, and the cold bars and the cold material are regularly and regularly arranged on the plug according to the sequence of firstly laying iron chips at the bottom, then laying the cold bars obliquely and then laying the cold material.
6. The method for placing the cold material of the ultra-large continuous casting round billet seal dummy ingot according to claim 5, characterized in that the usage amount of the cold strip and the cold material is calculated according to the following rule:
according to the heat balance principle, the heat released by the molten steel is equal to the heat absorbed in the crystallizer, and if the primary molten steel injected around the connecting piece is completely solidified when the casting is started, the released heat is as follows:
Q put ＝M Molten steel ·L Steel ；
In the formula, Q Put : heat released by the molten steel, kJ; m is a group of Molten steel : mass of molten steel, kg; l is Steel : latent heat of melting of steel; ρ: the density of the molten steel; d: diameter of cross section, m; l: height of molten steel in the crystallizer, m;
the heat released by the solidification of the molten steel is absorbed by primary cooling of the crystallizer and cold strips and cold materials, wherein the heat taken away by the primary cooling of the crystallizer is calculated as follows:
Q suction knot ＝M Water (W) ·C Water (W) ·ΔT 1 ；
In the formula, Q Suction knot : the heat absorbed by the crystallizer in primary cooling, kJ; m Water (W) : the pouring time period is the mass of cold water in kg; c Water (W) : specific heat capacity of water, 4.2 kJ/(kg. DEG C); delta T 1 : the temperature difference of crystallizer water is DEG C;
and the heat absorbed by the iron rod and the cooling spring added on the connecting piece is as follows:
Q cold absorption ＝M Cold ·C·ΔT+M Cold ·L Steel ；
In the formula, Q Cold absorption : heat absorbed by the cold bar and cold steel, kJ; m Cold : mass of cold bars and cold charge, kg; c: the specific heat capacity of the cold bar and the cold charge; Δ T: temperature increase of cold bars and cold charge;
when the mass of the cold strip and the cold charge exceeds the calculated value, the heat released by the solidification of the molten steel can be cooled once by the crystallizer and the cold charge of the cold strip can be completely absorbed.
7. The continuous casting pouring method according to claim 1, wherein in the step 4), when the cold bar and the cold material are placed, attention is paid to the fact that the central position is left empty, and a certain space is left for the immersion nozzle to prevent the collision during the centering process.
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| CN202210525003.1A CN115106487A (en) | 2022-05-14 | 2022-05-14 | Method for placing cold material of ultra-large-specification continuous casting round billet seal dummy ingot |
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| CN202210525003.1A CN115106487A (en) | 2022-05-14 | 2022-05-14 | Method for placing cold material of ultra-large-specification continuous casting round billet seal dummy ingot |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4719960A (en) * | 1986-02-03 | 1988-01-19 | Sms Schloemann-Siemag Ag. | Apparatus for connecting a dummy strip to the leading end of a casting in the start-up of continuous casting of strip metal |
| DE3916287C1 (en) * | 1989-05-19 | 1990-08-09 | Dislich, Geb. Hoyer, Margrit, Dr., 4100 Duisburg, De | Joining up dummy bar in continuous steel casting - by leaving gap between mould wall and sleeve, lining plate with paper or plastic foil etc. |
| DE102004046333A1 (en) * | 2003-10-21 | 2005-06-02 | Mannesmannröhren-Werke Ag | Unit to start a continuous casting assembly, for round cast strands, has a seal between the mold and the head of the cold strand to allow the strand to be detached easily from the casting inlet |
| CN104399914A (en) * | 2014-10-31 | 2015-03-11 | 河北钢铁股份有限公司邯郸分公司 | Device and method for reducing abrasion of lower opening of copper pipe of square blank crystallizer |
| KR101977357B1 (en) * | 2017-11-06 | 2019-08-28 | 주식회사 포스코 | Casting Method and Casting Apparatus |
| CN112916813A (en) * | 2019-12-05 | 2021-06-08 | 上海梅山钢铁股份有限公司 | Method for accurately selecting scrap iron material for continuous casting safety seal dummy ingot |
| CN215786623U (en) * | 2021-03-18 | 2022-02-11 | 江阴兴澄特种钢铁有限公司 | Casting device of billet continuous casting machine |
| CN114393186A (en) * | 2022-01-29 | 2022-04-26 | 新疆八一钢铁股份有限公司 | Method for preventing casting breakout of wide and thick slab continuous casting machine |
-
2022
- 2022-05-14 CN CN202210525003.1A patent/CN115106487A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4719960A (en) * | 1986-02-03 | 1988-01-19 | Sms Schloemann-Siemag Ag. | Apparatus for connecting a dummy strip to the leading end of a casting in the start-up of continuous casting of strip metal |
| DE3916287C1 (en) * | 1989-05-19 | 1990-08-09 | Dislich, Geb. Hoyer, Margrit, Dr., 4100 Duisburg, De | Joining up dummy bar in continuous steel casting - by leaving gap between mould wall and sleeve, lining plate with paper or plastic foil etc. |
| DE102004046333A1 (en) * | 2003-10-21 | 2005-06-02 | Mannesmannröhren-Werke Ag | Unit to start a continuous casting assembly, for round cast strands, has a seal between the mold and the head of the cold strand to allow the strand to be detached easily from the casting inlet |
| CN104399914A (en) * | 2014-10-31 | 2015-03-11 | 河北钢铁股份有限公司邯郸分公司 | Device and method for reducing abrasion of lower opening of copper pipe of square blank crystallizer |
| KR101977357B1 (en) * | 2017-11-06 | 2019-08-28 | 주식회사 포스코 | Casting Method and Casting Apparatus |
| CN112916813A (en) * | 2019-12-05 | 2021-06-08 | 上海梅山钢铁股份有限公司 | Method for accurately selecting scrap iron material for continuous casting safety seal dummy ingot |
| CN215786623U (en) * | 2021-03-18 | 2022-02-11 | 江阴兴澄特种钢铁有限公司 | Casting device of billet continuous casting machine |
| CN114393186A (en) * | 2022-01-29 | 2022-04-26 | 新疆八一钢铁股份有限公司 | Method for preventing casting breakout of wide and thick slab continuous casting machine |
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