CN115502356A - Slag line changing method for submerged nozzle in middle casting period and application - Google Patents
Slag line changing method for submerged nozzle in middle casting period and application Download PDFInfo
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- CN115502356A CN115502356A CN202211365447.XA CN202211365447A CN115502356A CN 115502356 A CN115502356 A CN 115502356A CN 202211365447 A CN202211365447 A CN 202211365447A CN 115502356 A CN115502356 A CN 115502356A
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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
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
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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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/002—Stainless steels
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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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Abstract
The invention discloses a slag line changing method for an immersion type water gap in the middle of casting and application thereof. The method has the advantages that the insertion depth of the submerged nozzle is adjusted by adjusting the height of molten steel containing a covering agent of the covering slag in the crystallizer, the change of the slag line is completed, the molten steel flow field in the crystallizer is influenced as little as possible, the slag entrapment is reduced, the steel-making inclusion of a casting blank is avoided, the quality of the casting blank is improved, and the method is suitable for the continuous casting production of 300-series and 400-series stainless steel.
Description
Technical Field
The invention belongs to the technical field of continuous casting processes, and particularly relates to a slag line changing method for an immersion type water gap in a middle casting period and application thereof.
Background
The slab continuous casting process is a process for obtaining a casting blank by casting, condensing and cutting liquid molten steel. The main link of the process is to continuously cast one or more furnaces of molten steel to form a casting blank. The slab caster comprises a tundish, a submerged nozzle and a crystallizer. The submerged nozzle is of a hollow tubular structure, an opening in the top of the submerged nozzle is connected with the tundish, and an opening in the bottom of the submerged nozzle is located in the crystallizer and is used for receiving molten steel from the tundish to the crystallizer, so that the important guarantee of non-oxidation pouring is realized. During production, the pouring basket receives molten steel poured from a ladle, the molten steel in the pouring basket flows into a cavity in the submerged nozzle through an opening in the top of the submerged nozzle and is distributed into the crystallizer through the cavity, and the molten steel forms molten steel in the crystallizerAnd casting to form a casting blank. The continuous casting requires that the submerged nozzle has good slag corrosion resistance and blockage prevention, so that the requirement of multi-furnace continuous casting is met, and the liquid state stability of the molten steel of the crystallizer is ensured. In the continuous casting production process of steel billets, the casting powder is usually used for preventing molten steel in a crystallizer from being oxidized, maintaining the lubrication and heat transfer between the crystallizer and a casting billet, and preventing the surface of the casting billet from generating defects and absorbing non-metallic oxides. In order to adjust the physical and chemical properties of the mold flux, it is necessary to add an alkaline component and a fluoride, which severely erode the refractory, to the molten steel so that the molten steel is strongly corroded with respect to the submerged nozzle. In order to improve the corrosion resistance of a submerged entry nozzle, zrO is usually added to a slag line portion of the submerged entry nozzle 2 And the slag line part of the submerged nozzle is arranged on the molten steel surface with stronger erosion property so as to weaken the erosion of the steel slag interface to the submerged nozzle. In order to disperse the local erosion of the slag line of the submerged nozzle and improve the service life of the submerged nozzle, the immersion depth of the submerged nozzle in the molten steel needs to be continuously changed in the production process (namely, the slag line changing operation is performed, the position where the submerged nozzle is in contact with the molten steel surface is called as a slag line, and the position where the submerged nozzle is in contact with the molten steel surface is called as a slag line changing operation), and the molten steel surface is kept at the position of the slag line of the submerged nozzle, so that the molten steel is prevented from corroding the same position where the submerged nozzle faces. In the prior art, the slag line changing operation is carried out by adjusting the height of a tundish and changing the contact position of an immersion nozzle and the liquid level of steel. The defect that the slag line change of the submerged nozzle is realized by adjusting the heights of two supporting oil cylinders of the tundish, the position of the slag line of the submerged nozzle is downward along with the height change of the tundish, the submerged nozzle is inserted downwards for 20mm, the used time is 5S, and the slag line change is completed, as shown in figure 2, the molten steel flow field in the crystallizer is seriously stirred when the insertion depth of the submerged nozzle is changed, the liquid level in the crystallizer fluctuates to generate slag entrapment, and the defects corresponding to the steelmaking of casting blanks are more frequent. The flow field of molten steel in the crystallizer is seriously influenced, so that liquid level fluctuation occurs, the three-layer structure of the casting powder in the crystallizer is damaged, the lubrication and heat transfer of the casting powder are influenced, slag rolling occurs on the surface of steel slag, double injection occurs on the surface of a casting blank, and the quality of the casting blank is influenced. The slag line change mode pairThe incidence rate of steel inclusion in casting blank casting is 5-10 times of that in normal casting blank (steady state casting, casting blank production when non-slag line is changed).
Therefore, how to design a slag line changing mode of the submerged nozzle does not affect a molten steel flow field in the crystallizer, reduces the occurrence of slag entrapment, and avoids affecting the quality of a casting blank when the slag line is changed is a technical problem to be solved by technical personnel in the field.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a slag line changing method for a submerged nozzle in the middle casting period and application thereof, wherein the insertion depth of the submerged nozzle is adjusted by adjusting the height of molten steel containing a covering agent of protective slag in a crystallizer, and when the liquid level of the molten steel in the crystallizer rises or falls, the submerged nozzle does not act to complete the change of the slag line.
In order to achieve the purpose and achieve the technical effect, the invention adopts the following technical scheme:
a slag line changing method for an immersion type water gap in the middle of casting is characterized in that: the liquid level of the molten steel in the crystallizer is controlled to rise or fall in the middle period of casting, and the submerged nozzle does not act, so that the slag line is changed.
Furthermore, the speed of rising or falling of the liquid level of the molten steel in the crystallizer is less than or equal to 2mm/min, the stirring of the molten steel flow field in the crystallizer is reduced, and when the liquid level of the molten steel in the crystallizer rises or falls at the speed of less than or equal to 2mm/min, the molten steel flow field is close to steady-state casting.
Further, when steady-state casting production is carried out in the middle casting period, the height of the liquid level of the molten steel in the crystallizer is kept at 800 +/-2 mm, and the effective height of the crystallizer is 900mm.
Further, the method comprises the following steps of controlling the liquid level of molten steel in the crystallizer to drop in the middle casting period, and enabling the submerged nozzle not to act, so as to realize slag line change: during steady-state casting production, the depth of the immersion nozzle inserted into the liquid level of the molten steel is 150 +/-5 mm, and the liquid level of the molten steel in the crystallizer is reduced by 15-20mm to a first target liquid level value.
Furthermore, the fluctuation range of the first target liquid level value is +/-2 mm, and the quality is not good if the liquid level fluctuation is increased during the adjustment of the liquid level height of the molten steel.
Further, after the liquid level of the molten steel in the crystallizer is controlled to be reduced to the first target liquid level value in the middle casting period, the cooling water amount of the crystallizer is increased by 1-2%, the molten steel is fully cooled in the crystallizer, the thickness of an initial solidified blank shell is more than or equal to 13mm when the molten steel is discharged from the crystallizer, and steel leakage is avoided.
Further, the molten steel liquid level in the crystallizer is controlled to rise in the middle casting period, the submerged nozzle does not act, and the slag line change is realized, and the method comprises the following steps: when in steady-state casting production, the immersion type water gap insertion depth is 130 plus or minus 5mm; and the liquid level of the molten steel in the crystallizer rises by 15-20mm to a second target liquid level value.
Further, the fluctuation range of the second target liquid level value is +/-2 mm, and when the liquid level height of the molten steel is adjusted, if the liquid level fluctuation is increased, the quality is not improved.
Furthermore, after the liquid level of the molten steel in the crystallizer is controlled to rise to the second target liquid level value in the middle casting period, the cooling water amount of the crystallizer is reduced by 1-2%, excessive cooling in the crystallizer is avoided, the strength of a primary blank shell is too high, and the abrasion of a copper plate of the crystallizer is increased.
The invention also aims to provide an application of the submerged nozzle in the slag line changing method in the continuous casting of stainless steel, wherein the stainless steel is 300 series stainless steel, 400 series stainless steel and the like.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that: the method has the advantages that the molten steel flow field in the crystallizer is influenced as little as possible, slag entrapment is reduced, steel making inclusion of a casting blank is avoided, the purity is improved, the molten steel flow field in the crystallizer is close to steady state casting, the quality of the casting blank is improved, and the method is suitable for continuous casting production of stainless steel types such as 300 and 400 systems.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic view showing a flow of molten steel in a mold according to example 1 of the present invention.
FIG. 2 is a schematic view of a molten steel flow field in the crystallizer of comparative example 1.
Detailed Description
The present invention will be further described with reference to comparative examples and examples.
Example 1
The casting time of the 304 stainless steel is usually 8-10 h, the liquid level of the molten steel in the crystallizer is controlled to drop in the middle casting period (about 4 h) of the 304 steel, the purpose of changing a slag line is achieved, and the detailed embodiment is as follows:
1) When in normal steady-state casting production, the liquid level height of the molten steel in the crystallizer is controlled to be 800 +/-2 mm, and the effective height of the crystallizer is 900mm;
2) The initial insertion depth of the submerged nozzle is 150 +/-5 mm during casting;
3) When a slag line is changed, the liquid level height of molten steel in the crystallizer is reduced by 20mm to a first target level value, 800mm → 780mm (the first target level value), after the liquid level of the molten steel is adjusted, the cooling water quantity of the crystallizer is increased by 1-2 percent, the molten steel is ensured to be fully cooled in the crystallizer, when the molten steel is discharged out of the crystallizer, the thickness of an initial solidified blank shell is more than or equal to 13mm, and the occurrence of steel leakage is avoided;
4) In the process of adjusting the liquid level height of the molten steel in the crystallizer, ensuring the fluctuation range of the liquid level of the molten steel: the first target liquid level value (780 mm) +/-2 mm fluctuates, and when the liquid level height of the molten steel is adjusted, if the fluctuation of the liquid level of the molten steel is increased, the quality is not improved;
5) In order to reduce the stirring of a molten steel flow field in the crystallizer, when the liquid level of the molten steel is reduced, the molten steel flow field is close to steady casting, and the liquid level height of the crystallizer is reduced at the speed of less than or equal to 2 mm/min.
As can be seen from the figure 1, when the liquid level of the molten steel in the crystallizer is implemented according to the scheme, the flow field of the molten steel in the crystallizer is almost the same as that in steady-state casting, thereby reducing the slag entrapment, avoiding the inclusion of steel-making of a casting blank and improving the quality of the casting blank.
Example 2
The casting time of the 304 stainless steel is usually 8-10 h, the liquid level of the molten steel in the crystallizer is controlled to rise in the middle casting period (about 4 h) of the 304 steel, the purpose of changing a slag line is achieved, and the detailed embodiment is as follows:
1) When in normal steady-state casting production, the liquid level height of the molten steel in the crystallizer is controlled to be 800 +/-2 mm, and the effective height of the crystallizer is 900mm;
2) The initial insertion depth of the submerged nozzle during casting is 130 +/-5 mm;
3) When the slag line is changed, the height of the liquid level in the crystallizer rises by 20mm to a second target liquid level value: adjusting the liquid level of the molten steel by 800mm → 820mm (a second target liquid level value), and after the liquid level of the molten steel is adjusted, reducing the cooling water amount of the crystallizer by 1-2 percent, avoiding excessive cooling in the crystallizer, overlarge strength of a primary blank shell and increased abrasion of a copper plate of the crystallizer;
4) In the process of adjusting the liquid level height of the molten steel in the crystallizer, ensuring the fluctuation range of the liquid level of the molten steel: the second target liquid level value (820 mm) ± 2mm fluctuates, and when the liquid level height is adjusted, if the fluctuation of the liquid level of the molten steel is increased, the quality is not improved.
5) In order to reduce the stirring of a molten steel flow field in the crystallizer and the rising process of the molten steel liquid level, the molten steel flow field is close to a steady state casting, and the molten steel liquid level in the crystallizer is increased upwards at a speed of less than or equal to 2 mm/min.
When the liquid level of the molten steel in the crystallizer is implemented according to the scheme, the molten steel flow field in the crystallizer is almost the same as that in the steady-state casting process, slag entrapment is reduced, steel inclusion in a casting blank is avoided, and the quality of the casting blank is improved.
The slag line changing method for the submerged nozzle in the middle casting period shown in the embodiment 1 and the embodiment 2 is also suitable for the continuous casting production of stainless steel grades such as 300 series, 400 series and the like.
Comparative example 1
Adopt prior art to carry out the slag line change, the submerged entry nozzle slag line change is through the height realization of two support cylinders of package in the middle of the adjustment, makes the slag line position of submerged entry nozzle change along with the middle package altitude variation, and submerged entry nozzle slag line change 20mm, the time spent: and 5S, as shown in figure 2, when the slag line is changed, the flow field of much water in the crystallizer is seriously influenced, liquid level fluctuation occurs, the three-layer structure of the casting powder in the crystallizer is damaged, the lubrication and heat transfer of the casting powder are influenced, slag entrapment occurs on the surface of steel slag, double injection occurs on the surface of a casting blank, and the quality of the casting blank is influenced. The incidence rate of steel-making inclusions of the corresponding casting blank is 5 to 10 times of that of a normal casting blank when the slag line is changed.
It can be seen from the embodiment 1, the embodiment 2 and the comparative example 1 that the method controls the rising or falling of the liquid level of the molten steel in the crystallizer, so that the influence of the mode of changing the slag line on the flow field of the molten steel is small, the molten steel flow is closer to the steady state casting, in addition, the fluctuation range of the target liquid level value is accurately controlled by controlling the rising or falling speed of the liquid level of the molten steel, the method has the advantages of affecting the flow field of the molten steel in the crystallizer as little as possible, reducing the slag entrapment, avoiding the inclusion of the steel made by the casting blank, improving the purity, ensuring that the flow field of the molten steel in the crystallizer is close to the steady state casting, improving the quality of the casting blank, and being suitable for the continuous casting production of stainless steel types such as 300 and 400 series.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the present invention pertains, the framework system can be flexible and changeable without departing from the concept of the present invention, and can be derived into a series of products. But rather a number of simple derivations or substitutions are made which are to be considered as falling within the scope of the invention as defined by the appended claims.
Claims (10)
1. A slag line changing method for a submerged nozzle in the middle casting period is characterized in that: the liquid level of the molten steel in the crystallizer is controlled to rise or fall in the middle period of casting, and the submerged nozzle does not act, so that the slag line is changed.
2. The method of claim 1 for mid-casting submerged entry nozzle slag line alteration, wherein: the speed of rising or falling of the liquid level of the molten steel in the crystallizer is less than or equal to 2mm/min, the stirring of the liquid level of the molten steel in the crystallizer in a molten steel flow field is reduced, and when the liquid level of the molten steel in the crystallizer rises or falls at the speed of less than or equal to 2mm/min, the liquid level of the molten steel is close to steady casting.
3. The mid-casting submerged nozzle slag line modification method of claim 2, characterized in that: when steady-state casting production is carried out in the middle casting period, the liquid level height of the molten steel in the crystallizer is kept at 800 +/-2 mm, and the effective height of the crystallizer is 900mm.
4. The method for changing the slag line of the submerged nozzle in the middle casting period according to any one of claims 1 to 3, wherein: the method is characterized in that the liquid level of molten steel in the crystallizer is controlled to drop in the middle casting period, the submerged nozzle does not act, and the slag line is changed, and comprises the following steps: during steady-state casting production, the depth of the immersion nozzle inserted into the liquid level of the molten steel is 150 +/-5 mm, and the liquid level of the molten steel in the crystallizer is reduced by 15-20mm to a first target liquid level value.
5. The mid-casting submerged nozzle slag line modification method of claim 4, characterized in that: the fluctuation range of the first target liquid level value is +/-2 mm.
6. The mid-casting submerged nozzle slag line modification method of claim 5, characterized in that: after the liquid level of the molten steel in the crystallizer is controlled to be reduced to a first target liquid level value in the middle casting period, the cooling water amount of the crystallizer is increased by 1-2%, and the thickness of an initial solidified blank shell is more than or equal to 13mm.
7. The method of slag line alteration of mid-casting submerged entry nozzle of any one of claims 1 to 3, wherein: the method is characterized in that the liquid level of the molten steel in the crystallizer is controlled to rise in the middle casting period, the submerged nozzle does not act, and the slag line is changed, and comprises the following steps: when in steady-state casting production, the immersion type water gap insertion depth is 130 plus or minus 5mm; and the liquid level of the molten steel in the crystallizer rises by 15-20mm to a second target liquid level value.
8. The mid-casting submerged nozzle slag line modification method of claim 7, characterized in that: the fluctuation range of the second target liquid level value is +/-2 mm.
9. The mid-casting submerged nozzle slag line modification method of claim 8, characterized in that: and after the liquid level of the molten steel in the crystallizer is controlled to rise to a second target liquid level value in the middle casting period, the cooling water amount of the crystallizer is reduced by 1-2%.
10. Use of a submerged entry nozzle according to any of claims 1-9 in a slag line modification method in the continuous casting of stainless steel.
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| CN202211365447.XA CN115502356B (en) | 2022-11-03 | 2022-11-03 | Method for changing submerged nozzle slag line in middle casting stage and application |
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| CN202211365447.XA CN115502356B (en) | 2022-11-03 | 2022-11-03 | Method for changing submerged nozzle slag line in middle casting stage and application |
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| CN115502356B CN115502356B (en) | 2023-07-21 |
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| CN107321949A (en) * | 2017-06-26 | 2017-11-07 | 日照宝华新材料有限公司 | Thin-slab caster becomes slag line method |
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| CN110788294A (en) * | 2019-10-30 | 2020-02-14 | 广东韶钢松山股份有限公司 | Method and system for adjusting slag line of submerged nozzle of continuous casting machine |
| CN110961590A (en) * | 2018-09-30 | 2020-04-07 | 上海梅山钢铁股份有限公司 | Molten steel superheat degree-based automatic submerged nozzle slag line control method |
| CN113649538A (en) * | 2021-08-19 | 2021-11-16 | 宝武集团鄂城钢铁有限公司 | Automatic slag line changing system of slab caster based on molten steel temperature control |
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2022
- 2022-11-03 CN CN202211365447.XA patent/CN115502356B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070068499A (en) * | 2005-12-27 | 2007-07-02 | 주식회사 포스코 | Method for continuous casting of stainless steel |
| JP2012020294A (en) * | 2010-07-12 | 2012-02-02 | Kobe Steel Ltd | Method for changing immersion depth of immersion nozzle |
| CN102513515A (en) * | 2011-12-20 | 2012-06-27 | 秦皇岛首秦金属材料有限公司 | Method for automatically changing slag line of tundish submersed nozzle for ultra-thick plate blank casting machine |
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| CN108889917A (en) * | 2018-06-13 | 2018-11-27 | 山东钢铁股份有限公司 | It is a kind of for providing the mold liquid level static type casting method of high-quality slab quality |
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