CN111299535A - Quality control method for head covering blank in slab continuous casting - Google Patents
Quality control method for head covering blank in slab continuous casting Download PDFInfo
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- CN111299535A CN111299535A CN202010303993.5A CN202010303993A CN111299535A CN 111299535 A CN111299535 A CN 111299535A CN 202010303993 A CN202010303993 A CN 202010303993A CN 111299535 A CN111299535 A CN 111299535A
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- tundish
- continuous casting
- molten steel
- pouring
- ladle
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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
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a quality control method for a Baotou billet in continuous casting of a slab. The invention improves the continuous casting process of the prior continuous casting slab, namely, the pouring processes of a ladle and a tundish are optimized, and the interval time between the ladle pouring and the tundish pouring is prolonged on the premise of not changing the tundish pouring process, so that the time of molten steel in the tundish is prolonged, impurities in the tundish and impurities generated in the initial casting stage have enough time to float out of the surface of the molten steel and cannot be mixed into the continuous casting slab; meanwhile, molten steel is continuously poured into the tundish, so that the temperature of the molten steel in the tundish can be kept, the phenomenon of solidification and cold steel is avoided, the tundish is prevented from being blocked, and the normal casting can be ensured; the operation method is simple, the existing continuous casting process is improved on the premise of not increasing equipment, the increase of production cost is avoided, and the method has positive significance for improving the quality of the intermediate ladle head blank.
Description
Technical Field
The invention relates to the technical field of metallurgy continuous casting production, in particular to a quality control method for a Baotou billet in slab continuous casting.
Background
In the continuous casting production, the molten steel in the ladle flows into the tundish through the long nozzle, and after the molten steel in the ladle is poured, the next furnace of molten steel is replaced to continue pouring. When the service life of the tundish reaches a certain standard, the tundish needs to be replaced by a new tundish, so that the continuous casting production is ensured not to be interrupted.
The head blank in continuous casting refers to a first continuous casting blank produced after a new tundish is used in the continuous casting process. After the careful tundish is started to be used, because the baking temperature of the inner wall of the tundish is far lower than the pouring temperature of the molten steel in the ladle, after the molten steel in the ladle is poured into the tundish, the temperature of the molten steel can be rapidly reduced, the molten steel is easy to solidify into cold steel, the molten steel cannot smoothly enter the crystallizer from the tundish, and the production is interrupted. In general, in order to solve the temperature, in the continuous casting production, after large ladle molten steel enters a tundish, the tundish must be rapidly poured to avoid cold steel blockage, so that the normal continuous casting production is ensured. However, because some impurities are always remained on the inner wall of the tundish, if the tundish is poured too early, the impurities cannot float out of the surface of molten steel quickly, and finally casting blank defects are formed; in addition, in the early stage of casting, a large amount of molten steel contacts with air, and easy oxides such as Al in the molten steel and oxygen in the air generate oxidation reaction to generate a large amount of inclusions, and if casting is early, the inclusions cannot be quickly floated on the surface of the molten steel, and finally casting blank inclusion defects are formed, so that the quality of a tundish head blank cannot meet the requirement, and finally the tundish head blank can be degraded.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a quality control method of a head blank in continuous casting of a plate blank with good quality of the head blank.
In order to solve the technical problems, the invention adopts the technical scheme that: the quality control method of the head blank in the continuous casting of the plate blank is based on the continuous casting process of the continuous casting plate blank, the interval time from the ladle casting to the tundish casting is prolonged, and impurities and inclusions in the tundish are floated out of the molten steel by prolonging the time of the molten steel in the tundish.
Further, the method comprises the following steps: the time interval from the pouring of the large ladle to the pouring of the middle ladle is not less than 80 seconds.
Further, the method comprises the following steps: in the ladle pouring process, the temperature of the molten steel in the ladle is more than 1580 ℃.
Further, the method comprises the following steps: in the pouring procedure of the tundish, the temperature of the molten steel in the tundish is higher than 1540 ℃.
Further, the method comprises the following steps: the initial thickness of the continuous casting slab is 180-220 mm.
Further, the method comprises the following steps: the initial thickness of the continuous casting slab is 200 mm.
The invention has the beneficial effects that: the invention improves the continuous casting process of the prior continuous casting slab, namely, the pouring processes of a ladle and a tundish are optimized, and the interval time between the ladle pouring and the tundish pouring is prolonged on the premise of not changing the tundish pouring process, so that the time of molten steel in the tundish is prolonged, impurities in the tundish and impurities generated in the initial casting stage have enough time to float out of the surface of the molten steel and cannot be mixed into the continuous casting slab; meanwhile, molten steel is continuously poured into the tundish, so that the temperature of the molten steel in the tundish can be kept, the phenomenon of solidification and cold steel is avoided, the tundish is prevented from being blocked, and the normal casting can be ensured; the operation method is simple, the existing continuous casting process is improved on the premise of not increasing equipment, the increase of production cost is avoided, and the method has positive significance for improving the quality of the intermediate ladle head blank.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be further described with reference to the following examples.
In order to solve the technical problems in the prior art, the invention provides a quality control method for a head blank in continuous casting of a plate blank, which has good quality of the head blank. The control method of the invention is based on the continuous casting process of the continuous casting slab, the interval time from the ladle casting to the tundish casting is prolonged, and impurities and inclusions in the tundish are floated out of the molten steel by prolonging the time of the molten steel in the tundish. The invention improves the continuous casting process of the prior continuous casting slab, namely, the pouring processes of a ladle and a tundish are optimized, and the interval time between the ladle pouring and the tundish pouring is prolonged on the premise of not changing the tundish pouring process, so that the time of molten steel in the tundish is prolonged, impurities in the tundish and impurities generated in the initial casting stage have enough time to float out of the surface of the molten steel and cannot be mixed into the continuous casting slab; meanwhile, molten steel is continuously poured into the tundish, so that the temperature of the molten steel in the tundish can be kept, the phenomenon of solidification and cold steel is avoided, the tundish is prevented from being blocked, and the normal casting can be ensured.
Combining the situation of the continuous casting production process in the prior art, because the baking temperature of the inner wall of the tundish is generally 1100-1200 ℃, the pouring temperature of the molten steel in the ladle is more than 1580 ℃, the molten steel in the ladle needs to be poured continuously after being poured into the tundish to ensure the temperature of the molten steel in the tundish, and because heat loss exists in the pouring process, the temperature of the molten steel in the tundish is finally kept above 1540 ℃, the time for pouring the molten steel of the ladle into the tundish at the temperature cannot be lower than 80 seconds, and if the temperature is less than 80 seconds, the temperature of the molten steel in the tundish is not increased sufficiently, and the phenomenon of cold steel can be caused subsequently. In addition, the inventors examined impurities and inclusions in molten steel in a tundish, and the time of 80 seconds was sufficient for the impurities and inclusions in the molten steel to float up to the surface of the molten steel, so that the inventors finally determined that the interval from the start of the ladle to the start of the tundish was not less than 80 seconds.
Correspondingly, the initial thickness of the continuous casting slab mainly aimed by the control method is 180-220 mm, and the optimal initial thickness of the continuous casting slab is 200 mm.
Example (b):
example 1: 8, 2 days in 2019, the first furnace of the tundish is used, 80 seconds after the pouring of the bale is started, the pouring of the tundish is started, and the quality of the tundish head blank is qualified and is not degraded.
Example 2: and 8, 4 days in 2019, the first furnace of the tundish is used, 80 seconds after the pouring of the bale is started, the pouring of the tundish is started, and the quality of the tundish head blank is qualified and is not degraded.
Example 3: and 8, 5 days in 2019, the first furnace of the tundish is used, 80 seconds after the pouring of the bale is started, the pouring of the tundish is started, and the quality of the tundish head blank is qualified and is not degraded.
In conclusion, the control method is feasible and has guarantee for improving the quality of the tundish head blank, the invention adopts the method of prolonging the interval time between the ladle casting and the tundish casting, improves the temperature of molten steel in the tundish, simultaneously avoids impurities and inclusions in the molten steel from entering a continuous casting plate blank formed by subsequent continuous casting, improves the quality of the tundish head blank on the premise of not improving the production cost, has obvious benefit and has good popularization and application prospects.
Claims (6)
1. The quality control method of the head blank in the continuous casting of the plate blank is characterized in that: the control method is based on the continuous casting process of the continuous casting slab, the interval time from ladle casting to tundish casting is prolonged, and impurities and inclusions in the tundish are floated out of the molten steel by prolonging the time of the molten steel in the tundish.
2. The method for controlling the quality of a shell blank in continuous slab casting according to claim 1, wherein: the time interval from the pouring of the large ladle to the pouring of the middle ladle is not less than 80 seconds.
3. The method for controlling the quality of a shell blank in continuous slab casting according to claim 1, wherein: in the ladle pouring process, the temperature of the molten steel in the ladle is more than 1580 ℃.
4. The method for controlling the quality of a shell blank in continuous slab casting according to claim 1, wherein: in the pouring procedure of the tundish, the temperature of the molten steel in the tundish is higher than 1540 ℃.
5. The method for controlling the quality of a shell blank in continuous slab casting according to claim 1, wherein: the initial thickness of the continuous casting slab is 180-220 mm.
6. The method for controlling the quality of a shell blank in continuous slab casting according to claim 5, wherein: the initial thickness of the continuous casting slab is 200 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010303993.5A CN111299535A (en) | 2020-04-17 | 2020-04-17 | Quality control method for head covering blank in slab continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010303993.5A CN111299535A (en) | 2020-04-17 | 2020-04-17 | Quality control method for head covering blank in slab continuous casting |
Publications (1)
| Publication Number | Publication Date |
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| CN111299535A true CN111299535A (en) | 2020-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010303993.5A Pending CN111299535A (en) | 2020-04-17 | 2020-04-17 | Quality control method for head covering blank in slab continuous casting |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5626663A (en) * | 1979-08-07 | 1981-03-14 | Kobe Steel Ltd | Method for preventing entry of inclusion in continuous casting of steel |
| JPS6083755A (en) * | 1983-10-14 | 1985-05-13 | Shinagawa Refract Co Ltd | Tubular refractory for controlling flow of molten steel in tundish for continuous casting and method for controlling flow of molten steel by using said tubular refractory |
| CN2400201Y (en) * | 1999-11-22 | 2000-10-11 | 冶金工业部洛阳耐火材料研究院 | Casting cup for continuous casting pouring ladle pouring steel |
| CN101028648A (en) * | 2007-03-16 | 2007-09-05 | 中国科学院金属研究所 | Method for casting super-large single-material cast steel bearing roller above 100 ton |
| CN201132206Y (en) * | 2007-08-11 | 2008-10-15 | 衡阳华菱连轧管有限公司 | Turbulence controller of horizontal continuous casting tundish |
| CN102248136A (en) * | 2011-07-08 | 2011-11-23 | 天津钢铁集团有限公司 | Pouring and breakout preventing technological method for continuous casting |
| CN103464732A (en) * | 2013-08-29 | 2013-12-25 | 鞍钢股份有限公司 | Method for capturing and absorbing suspending impurities in tundish |
| CN104942254A (en) * | 2015-06-13 | 2015-09-30 | 秦皇岛首秦金属材料有限公司 | Method for improving continuous casting slab quality |
| CN107058865A (en) * | 2017-01-12 | 2017-08-18 | 西王金属科技有限公司 | A kind of railway brake beam material XWQ470E and processing method |
| CN108971444A (en) * | 2018-06-29 | 2018-12-11 | 首钢京唐钢铁联合有限责任公司 | A method of improving IF steel slab quality of primary blank |
-
2020
- 2020-04-17 CN CN202010303993.5A patent/CN111299535A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5626663A (en) * | 1979-08-07 | 1981-03-14 | Kobe Steel Ltd | Method for preventing entry of inclusion in continuous casting of steel |
| JPS6083755A (en) * | 1983-10-14 | 1985-05-13 | Shinagawa Refract Co Ltd | Tubular refractory for controlling flow of molten steel in tundish for continuous casting and method for controlling flow of molten steel by using said tubular refractory |
| CN2400201Y (en) * | 1999-11-22 | 2000-10-11 | 冶金工业部洛阳耐火材料研究院 | Casting cup for continuous casting pouring ladle pouring steel |
| CN101028648A (en) * | 2007-03-16 | 2007-09-05 | 中国科学院金属研究所 | Method for casting super-large single-material cast steel bearing roller above 100 ton |
| CN201132206Y (en) * | 2007-08-11 | 2008-10-15 | 衡阳华菱连轧管有限公司 | Turbulence controller of horizontal continuous casting tundish |
| CN102248136A (en) * | 2011-07-08 | 2011-11-23 | 天津钢铁集团有限公司 | Pouring and breakout preventing technological method for continuous casting |
| CN103464732A (en) * | 2013-08-29 | 2013-12-25 | 鞍钢股份有限公司 | Method for capturing and absorbing suspending impurities in tundish |
| CN104942254A (en) * | 2015-06-13 | 2015-09-30 | 秦皇岛首秦金属材料有限公司 | Method for improving continuous casting slab quality |
| CN107058865A (en) * | 2017-01-12 | 2017-08-18 | 西王金属科技有限公司 | A kind of railway brake beam material XWQ470E and processing method |
| CN108971444A (en) * | 2018-06-29 | 2018-12-11 | 首钢京唐钢铁联合有限责任公司 | A method of improving IF steel slab quality of primary blank |
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Application publication date: 20200619 |
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| RJ01 | Rejection of invention patent application after publication |