CN108296463B - Method for controlling superheat degree of continuous casting tundish - Google Patents
Method for controlling superheat degree of continuous casting tundish Download PDFInfo
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- CN108296463B CN108296463B CN201711021951.7A CN201711021951A CN108296463B CN 108296463 B CN108296463 B CN 108296463B CN 201711021951 A CN201711021951 A CN 201711021951A CN 108296463 B CN108296463 B CN 108296463B
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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
- B22D11/10—Supplying or treating molten metal
Abstract
The invention discloses a method for controlling superheat degree of a continuous casting tundish, (1) when smelting time is more than 45 minutes, the end point temperature of a type A ladle is 1590 +/-3 ℃, and when the smelting time is less than or equal to 45 minutes, the end point temperature of a type A2 ladle is 1587-1592 ℃; (2) when the smelting time is more than 45 minutes, the end point temperature of the A-type ladle is 1590 +/-3 ℃; (3) when the smelting time is less than or equal to 45 minutes, the end point temperature of the A2 type ladle is 1587 ℃ plus or minus 5 ℃, and the liquidus temperature is greater than 1528 ℃; (4) when the smelting time is less than or equal to 40 minutes, the end point temperature of the A2 type ladle is 1587 +/-7 ℃; (5) after the alloy and lime are added for melting and the top slag is deoxidized, 5kg of carbon powder is added every 2 minutes, and the fluctuation of a current curve is within 20 mm; (6) controlling the argon flow to a soft blowing mode, and reducing the temperature by 1 ℃ per minute; (7) each feed line 100m was lowered by 3 ℃. The invention adopts optimized process measures to control the superheat degree of the steelmaking continuous casting tundish, improve the coincidence rate of the superheat degree of the continuous casting tundish, reduce the internal defects of the continuous casting billet and improve the internal quality of the steel type continuous casting billet.
Description
Technical Field
The invention belongs to the technical field of steel making, and particularly relates to a method for controlling superheat degree of a continuous casting tundish in continuous casting.
Background
The low-superheat pouring of the continuous casting tundish is one of the most important process technologies for stabilizing the continuous casting process and obtaining high-quality casting blanks, and if the superheat degree is high, the billet shell of a billet can be thinned, molten steel is easy to oxidize secondarily, inclusions are increased, and a series of production quality accidents such as bulging, steel leakage, developed columnar crystals, center segregation, shrinkage cavity and the like are easy to occur. Most slabs produced by slab caster of steel-making enterprises are supplied to hot-rolling and medium plate factories as raw materials, because of the rolling characteristic of the hot-rolling and medium plate with smaller compression ratio, the quality of the provided slabs is required to be defect-free slabs, and the hot degree hit rate in the caster is improved in the steel-making area, which is one of the important process parameters for obtaining defect-free slabs by the caster.
First, the smooth production of billets is considered: the tundish temperature is too low (close to or lower than the liquidus temperature of the steel grade), so that the molten steel is caused to be 'dead' in a water port of the crystallizer; the tundish temperature is too high, and bleed-out is easily caused. Neither of these two cases will make the production smooth.
Secondly, the quality requirements of specific steel grades are considered: surface mass, low power mass, compositional segregation, purity, and the like. Generally, a higher superheat degree has certain benefits on surface quality and purity, but is unfavorable for controlling low-power shrinkage cavity and component segregation; conversely, the results are also substantially opposite.
Regarding the specific control method, the specific conditions of each factory and each production line are different, and the tundish volume, the ladle volume, the pouring period of each furnace steel, the heat preservation measures and the like.
Disclosure of Invention
The invention aims to provide a method for controlling the superheat degree of a continuous casting tundish.
The purpose of the invention is realized as follows: a method for controlling the superheat degree of a continuous casting tundish,
(1) when the smelting time is more than 45 minutes, the end point temperature of the A-type ladle is 1590 +/-3 ℃, and when the smelting time is less than or equal to 45 minutes, the end point temperature of the A2-type ladle is 1587-1592 ℃;
(2) when the smelting time is more than 45 minutes, the end point temperature of the A-type ladle is 1590 +/-3 ℃, the negative deviation of the large-section casting blank is allowed, and the positive deviation of the small-section casting blank is allowed;
(3) when the smelting time is less than or equal to 45 minutes, the end point temperature of an A2 ladle is 1587 +/-5 ℃, the large-section casting blank is allowed to have negative deviation, the small-section casting blank is allowed to have positive deviation, the liquidus temperature is greater than the 1528 ℃ allowed positive deviation, but the deviation range is not more than +/-7 ℃;
(4) when the smelting time is less than or equal to 40 minutes, the end point temperature of an A2 ladle is 1587 +/-7 ℃, the negative deviation of a large-section casting blank is allowed, and the positive deviation of a small-section casting blank is allowed;
(5) adding alloy and lime before smelting molten steel, melting and deoxidizing top slag, adding 5kg of carbon powder every 2 minutes, wherein the fluctuation of a current curve is within 20 mm;
(6) under the condition of no power supply, the argon flow is controlled to be in a soft blowing mode, 1 ℃ is reduced every minute, excessive reduction is realized, and the compensation temperature is given;
(7) measuring the temperature before and after feeding the pure calcium wire, reducing the temperature by 3 ℃ when each wire is fed by 100m, and controlling the compensation temperature to be 5-10 ℃ if the temperature is not compensated.
The A-type ladle is a ladle used continuously.
The A2 ladle is a ladle which is within 2 hours from the bottom of a continuous casting platform to the vacancy of converter tapping.
The invention has the following beneficial effects:
by adopting the measures, the superheat degree coincidence rate of the continuous casting tundish is increased to 98.4 percent, is increased by 2.1 percent compared with the prior art, has obvious effect, and basically eliminates the defects of corner cracks, central shrinkage cavity and the like of the continuous casting billet.
The method is suitable for the same type of steel-making enterprises, greatly improves the internal quality problem of the continuous casting billet caused by the superheat degree problem of the continuous casting tundish, adopts the measure of optimizing the process, reduces the internal defect rate of the continuous casting billet to a lower level, and improves the quality of the continuous casting billet.
The invention adopts optimized process measures, controls the superheat degree of the steelmaking continuous casting tundish, improves the coincidence rate of the superheat degree of the continuous casting tundish, reduces the internal defects of the continuous casting billet and improves the internal quality of the steel type continuous casting billet.
Detailed Description
The technical solution of the present invention is further illustrated by the following embodiments
A method for controlling the superheat degree of a continuous casting tundish comprises the following steps:
1. the method comprises the following steps of smelting a type steel ladle when the smelting time is more than 45 minutes, wherein the type A steel ladle is a continuously used steel ladle, the end point temperature is 1590 ℃, the end point temperature is allowed to be +/-2 ℃, the smelting time is not more than 45 minutes, the type A2 steel ladle is a steel ladle when the converter steel tapping is vacant for 2 hours, the type A2 steel ladle is a steel ladle from the lower part of a continuous casting platform, the end point temperature is 1591 ℃, the end point temperature is +4 ℃, the negative deviation is allowed for a large section (a casting blank with the specification of more than 1300 x 220 mmg), and the positive deviation is allowed for a small section (a casting blank with the specification of more than 950 x 220mm-1300 x 220 mm.
2. When the smelting time is more than 45 minutes, the end point temperature of the A-type ladle is allowed to be +/-3 ℃, the negative deviation is allowed for the large section, the positive deviation is allowed for the small section, and the deviation range is not more than 3 ℃.
3. When the smelting time is less than or equal to 45min, the end point temperature of the A2 ladle is 1587 ℃, the large section allows negative deviation, the small section allows positive deviation but the deviation range is not more than +/-4 ℃, and the liquidus temperature is more than the allowable positive deviation at 1528 ℃ but the deviation range is not more than +/-5 ℃.
4. When the smelting time is less than or equal to 40min, the end point temperature of the A2 ladle is 1590 ℃, the large section allows negative deviation, and the small section allows positive deviation but the deviation range is not more than +/-5 ℃.
5. Adding large amount of alloy and lime into molten steel in the early stage of smelting, melting and deoxidizing top slag, adding arc-burying agent in batches at intervals of 2min, wherein the arc-burying agent is C powder, the adding amount is 5kg each time, and the fluctuation of a current curve is within 20mm, for example: the temperature is raised by 4 ℃ per minute by 8-gear power transmission, the generated chemical heat is not considered, and the continuous casting ladle preparation time can be reduced and the compensation temperature can be given when the temperature is lower than 4 ℃.
6. In the non-power-supply state, the argon flow is controlled to be in a soft blowing mode, the argon flow is reduced by 1 ℃ per minute, and the compensation temperature is excessively given.
7. And measuring the temperature before feeding and after feeding, wherein the temperature of the silk threads can be reduced by 3 ℃ when each 100m silk thread is fed, otherwise, the compensation temperature is considered. The compensation temperature is controlled at 8 ℃, and the adjustment is carried out according to the continuous casting ladle preparation time.
Claims (1)
1. A method for controlling the superheat degree of a continuous casting tundish is characterized by comprising the following steps:
(1) when the smelting time is more than 45 minutes, the end point temperature of the A-type steel ladle is 1590 ℃, the end point temperature is allowed to be +/-3 ℃, and when the smelting time is less than or equal to 45 minutes, the end point temperature of the A2 steel ladle is 1591 ℃, and the end point temperature is +4 ℃;
(2) when the smelting time is more than 45 minutes, the end point temperature of the A-type ladle is allowed to be 1590 +/-3 ℃, the large section is allowed to have negative deviation, and the small section is allowed to have positive deviation but the deviation range is not more than 3 ℃;
(3) when the smelting time is less than or equal to 45min, the end point temperature of an A2 ladle is 1587 ℃, the large section allows negative deviation, the small section allows positive deviation but the deviation range is not more than +/-4 ℃, and the liquidus temperature is more than the allowable positive deviation at 1528 ℃ but the deviation range is not more than +/-5 ℃;
(4) when the smelting time is less than or equal to 40min, the end point temperature of an A2 ladle is 1590 ℃, the negative deviation is allowed for the large section, the positive deviation is allowed for the small section, but the deviation range is not more than +/-5 ℃;
(5) adding alloy and lime before smelting molten steel, melting and deoxidizing top slag, adding 5kg of carbon powder every 2 minutes, wherein the fluctuation of a current curve is within 20 mm;
(6) under the condition of no power supply, the argon flow is controlled to be in a soft blowing mode, 1 ℃ is reduced every minute, excessive reduction is realized, and the compensation temperature is given;
(7) and measuring the temperature before and after feeding the pure calcium wire, wherein each feeding wire is 100m, the temperature can be reduced by 3 ℃, otherwise, the compensation temperature is given, the compensation temperature is controlled to be 5-10 ℃, A type steel ladles are continuously used steel ladles, A2 type steel ladles are steel ladles within 2 hours from the lower part of a continuous casting platform to the empty part of converter steel tapping, the large section of each steel ladle is a casting blank with the specification of more than 1300 x 220mm, and the small section of each steel blank with the specification of 950 x 220mm-1300 x 220 mm.
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| CN201711021951.7A CN108296463B (en) | 2017-10-26 | 2017-10-26 | Method for controlling superheat degree of continuous casting tundish |
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| CN201711021951.7A CN108296463B (en) | 2017-10-26 | 2017-10-26 | Method for controlling superheat degree of continuous casting tundish |
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| CN108296463B true CN108296463B (en) | 2021-01-01 |
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| CN111715858A (en) * | 2020-06-30 | 2020-09-29 | 南阳汉冶特钢有限公司 | Production method for realizing low-superheat-degree continuous casting |
| CN111957918B (en) * | 2020-09-08 | 2021-10-26 | 福建三钢闽光股份有限公司 | Control method for stabilizing superheat degree of 400VN steel in starting process |
| CN116117095B (en) * | 2023-01-06 | 2023-06-20 | 江苏省沙钢钢铁研究院有限公司 | High-carbon steel wire rod and preparation method thereof |
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| CN106480367A (en) * | 2015-08-28 | 2017-03-08 | 宝钢集团新疆八钢铁有限公司 | A kind of production method of high-strength cold-formed automobile axle housing steel |
| CN106938325A (en) * | 2017-03-08 | 2017-07-11 | 内蒙古包钢钢联股份有限公司 | The pouring procedure of low overheat rare earth steel and Aluminum steel |
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2017
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1217959A (en) * | 1997-11-14 | 1999-06-02 | 中国科学技术大学 | Method for plasma heating ladle online to cast continuously at constant low overheated temperature |
| KR20030053729A (en) * | 2001-12-22 | 2003-07-02 | 주식회사 포스코 | Monitering system for temperature of melten steel in tundish |
| JP2009041842A (en) * | 2007-08-09 | 2009-02-26 | Nippon Steel Corp | In-ladle molten steel temperature measuring device |
| JP2013076133A (en) * | 2011-09-30 | 2013-04-25 | Nisshin Steel Co Ltd | Continuous casting method |
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| KR20160032307A (en) * | 2014-09-15 | 2016-03-24 | 주식회사 포스코 | Apparatus for measuring level of molten steel in mold during startup period of casting process |
| CN104841901A (en) * | 2015-05-11 | 2015-08-19 | 首钢总公司 | Method for improving solidifying ditch on surface of ultra-low carbon steel continuous casting slab |
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