CN110732663B - Immersion type water gap - Google Patents
Immersion type water gap Download PDFInfo
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- CN110732663B CN110732663B CN201911004566.0A CN201911004566A CN110732663B CN 110732663 B CN110732663 B CN 110732663B CN 201911004566 A CN201911004566 A CN 201911004566A CN 110732663 B CN110732663 B CN 110732663B
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- submerged
- cavity
- nozzle body
- nozzle
- fluid outlet
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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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
Abstract
The invention belongs to the technical field of thick slab continuous casting, and discloses an immersion type water gap, which comprises: a submerged entry nozzle body; the interior fluid containing chamber of immersion nozzle body includes: the submerged nozzle comprises a fluid inlet, an upper cavity, a lower cavity and a fluid outlet formed in the side wall of the lower portion of the submerged nozzle body, wherein the fluid inlet is communicated with the upper cavity, the fluid outlet is communicated with the lower cavity, and the lower end of the submerged nozzle body is of a sealed structure; the ratio of the area of the cross section of the lower cavity to the area of the cross section of the upper cavity is 1.2-3. The submerged nozzle provided by the invention can inhibit the amount of bubbles on the surface of a casting blank.
Description
Technical Field
The invention relates to the technical field of thick slab continuous casting, in particular to an immersion type water gap.
Background
In addition to the requirements for mechanical properties, automotive steel sheets have very stringent surface quality requirements. In order to prevent the nozzle from being blocked and to maintain the seal, argon gas is generally blown into the nozzle and the like, which inevitably enters the mold with the molten steel from the outlet of the submerged nozzle, and is captured by the solidified shell, resulting in the formation of the streak defects. In contrast, conventionally, the number of bubbles in the surface layer of the cast slab is reduced, and the number of strip defects is suppressed by reducing the amount of argon blown in continuous casting. However, the reduction of the argon blowing amount can aggravate the degree of nozzle blockage and influence the number of continuous casting furnaces and the quality of rolled plates.
Disclosure of Invention
The invention provides a submerged nozzle, which solves the technical problem of poor control effect of the surface quantity of a casting blank in continuous casting operation in the prior art.
In order to solve the above technical problem, the present invention provides an immersion nozzle, comprising: a submerged entry nozzle body;
the interior fluid containing chamber of immersion nozzle body includes: the submerged nozzle comprises a fluid inlet, an upper cavity, a lower cavity and a fluid outlet formed in the side wall of the lower portion of the submerged nozzle body, wherein the fluid inlet is communicated with the upper cavity, the fluid outlet is communicated with the lower cavity, and the lower end of the submerged nozzle body is of a sealed structure;
the ratio of the area of the cross section of the lower cavity to the area of the cross section of the upper cavity is 1.2-3, an arc-shaped connecting part is arranged between the upper cavity and the lower cavity, and the upper cavity and the lower cavity are both of cylindrical structures.
Further, the inner diameter range of the upper cavity is: 50 mm-120 mm, the inner diameter range of the lower cavity is 90 mm-250 mm, and the height range is 750 mm-1250 mm.
Furthermore, the distance between the lower edge of the fluid outlet and the bottom end of the submerged nozzle body is 100-150 mm, and the height of the fluid outlet is 80-100 mm.
Further, the thickness of the refractory material inside the submerged nozzle body is 20 mm-35 mm.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the immersion nozzle that provides in the embodiment of this application, through two fluid chamber that the internal diameter is obviously inconsistent in big-end-up that form at the mouth of a river inner chamber, thereby flow into the back according to the constant speed when the molten steel that contains the bubble, can cushion in the bigger lower part of internal diameter holds the intracavity, and form the fall clearance between the two, thereby make the bubble independently upward movement, and merge into great bubble upwards discharge, thereby make the bubble volume in the molten steel in the outflow path crystallizer through the fluid outlet reduce by a wide margin, thereby better suppression casting blank surface bubble.
Drawings
FIG. 1 is a schematic view of a submerged entry nozzle according to an embodiment of the present invention;
fig. 2 is a schematic view showing the structure and operation of a conventional submerged entry nozzle.
Detailed Description
The embodiment of the application solves the technical problem that in the continuous casting operation in the prior art, the control effect of the number of the casting blank surface layers is poor by providing the submerged nozzle.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features of the embodiments and examples of the present application may be combined with each other without conflict.
Referring to fig. 1, a submerged entry nozzle, comprising: a submerged entry nozzle body;
the interior fluid containing chamber of immersion nozzle body includes: the submerged nozzle comprises a fluid inlet 1, an upper accommodating cavity 2, a lower accommodating cavity 3 and a fluid outlet 4 formed in the side wall of the lower portion of the submerged nozzle body, wherein the fluid inlet 1 is communicated with the upper accommodating cavity 2, the fluid outlet 4 is communicated with the lower accommodating cavity 3, and the lower end of the submerged nozzle body is of a sealed structure.
In the embodiment, the ratio of the area of the cross section of the lower cavity 3 to the area of the cross section of the upper cavity 2 is 1.2-3; therefore, a cavity structure with the inner diameter being remarkably different and the upper part being small and the lower part being large is formed between the inner fluid cavities of the submerged nozzle body; after the molten steel 6 containing bubbles flows in, an obvious gap is formed between the upper and lower cavities under the condition of constant-speed inflow due to the larger lower space; on one hand, bubbles are buffered by deceleration at the tail end of the submerged nozzle, on the other hand, a gap area is formed at a connection part, so that a large amount of small-size bubbles are gathered into large-size bubbles 7, the large-size bubbles 7 float upwards and overflow from the inner wall of the nozzle along the gap area due to the influence of buoyancy, only few parts of small-size bubbles flow into the crystallizer 8 along with molten steel from the side hole, the number of the bubbles captured by a casting blank in the casting process is remarkably reduced by using the nozzle, the bubble inhibiting effect on the surface of the casting blank is greatly improved, and the surface quality of an.
Further: an arc-shaped joint part 5 is arranged between the upper cavity 2 and the lower cavity 3, so that a relatively smooth bubble flow channel can be formed. Of course, the upper and lower cavities can be directly contacted, and a certain bubble inhibiting effect can also be achieved.
Generally, the upper and lower chambers 2 and 3 are of cylindrical configuration.
In this embodiment, the inner diameter range of the upper receiving cavity 2 is as follows: 50 mm-120 mm, the inner diameter range of the lower part containing cavity 3 is 90 mm-250 mm, and the height range is 750 mm-1250 mm.
Further, the lower edge of the fluid outlet 4 is 100 mm-150 mm away from the bottom end of the submerged nozzle body, and the height of the fluid outlet 4 is 80 mm-100 mm.
Further, the thickness of the refractory material inside the submerged nozzle body is 20 mm-35 mm.
Of course, on the basis of the structural design, the bubble suppression effect can be further improved by matching with certain operation.
Specifically, the distance between the outer diameter of the submerged nozzle and the inner and outer arc copper plates of the crystallizer 8 is 50-75 mm, so that the submerged nozzle structure does not influence the normal formation of the wide-surface solidified shell of the continuous casting crystallizer.
The flow rate of the molten steel is limited to less than 0.07m/s so as not to affect the effect of removing inclusions by bubbles.
The drawing speed and the blowing flow rate have important influence on the size distribution of the bubbles, and the larger the drawing speed is, the more the bubbles are, and the larger the size is; the larger the amount of air blown per unit time, the larger the size of the air bubbles. The deep insertion of the water gap has great influence on the distribution range of bubbles, and further influences the condition that the bubbles are captured by the solidified shell. Therefore, after the new nozzle is adopted, the control range of the continuous casting process is as follows: the thickness of the casting slab is 180 mm-250 mm, the superheat degree of the molten steel of the tundish is 15-35 ℃, the drawing speed is 0.8-1.8 m/min, the depth of a water gap inserted into the liquid surface is 140-190 mm, and the total blowing-in amount of argon is 6-20L/min.
For further illustration, this example also provides two specific embodiments.
Example 1
The industrial experiment is carried out on a flow slab continuous casting machine of a certain steel mill, the tonnage of a tundish is 60 tons, SPHC steel is continuously cast at the drawing speed of 1.2m/min, the casting section is 1400mm multiplied by 230mm, the total blowing-in amount of argon is 12L/min, and the superheat degree of tundish molten steel is 25 ℃. The application provides a degree of depth that immersion nozzle inserted the liquid level is 170mm, and the top size 78mm of inner chamber longitudinal section, below size 120mm, high 900 mm. The side opening is opened and is put on the terminal lateral wall of immersion nozzle inner chamber for discharge molten steel in the immersion nozzle, tapping side opening lower edge is apart from mouth of a river bottom 115mm, and the side opening height is 90 mm. The area ratio of the upper section to the lower section after the expansion of the nozzle is 2.5, the thickness of the refractory material of the nozzle is 25mm, and the distance between the outer diameter of the nozzle and the inner and outer arc copper plates of the crystallizer is 60 mm. In the process of using the submerged nozzle, molten steel enters from an inlet at the upper part of the submerged nozzle, after the molten steel flows into the submerged nozzle, the molten steel is buffered at the speed reduction at the tail end to form a gap area, a large number of small-size bubbles are gathered into large-size bubbles, the large-size bubbles float upwards and overflow from the inner wall of the nozzle along the gap area due to the influence of buoyancy, and only a few parts of small-size bubbles flow out of the side hole into the crystallizer along with the molten steel.
After casting is finished, the casting blank is planed layer by layer to be detected, and the number of bubbles in the casting blank within 15mm of the surface of the casting blank is reduced to 1 from 85 after the nozzle is used, so that the surface quality is greatly improved.
Example 2
An industrial experiment is carried out on a two-flow slab continuous casting machine of a certain steel mill, the tonnage of a tundish is 70 tons, DC04 steel is continuously cast at the drawing speed of 1.5m/min, the casting section is 1050mm multiplied by 230mm, the total blowing-in amount of argon is 10.6L/min, and the superheat degree of tundish molten steel is 20 ℃. The application provides a degree of depth that immersion nozzle inserted the liquid level is 160mm, and the top size 82mm of inner chamber longitudinal section, below size 150mm, height 920 mm. The side opening is opened and is put on the terminal lateral wall of immersion nozzle inner chamber for discharge molten steel in the immersion nozzle, tapping side opening lower edge distance mouth of a river bottom 117mm, side opening height 90 mm. After expansion, the area ratio of the upper cross section of the water gap to the upper cross section of the side hole is 1.6, the thickness of the refractory material of the water gap is 28mm, and the distance between the outer diameter of the water gap and the inner and outer arc copper plates of the crystallizer is 60 mm. In the process of using the submerged nozzle, molten steel enters from an inlet at the upper part of the submerged nozzle, after the molten steel flows into the submerged nozzle, the molten steel is buffered at the speed reduction at the tail end, meanwhile, a gap area is formed, a large number of small-size bubbles are gathered into large-size bubbles, the large-size bubbles float upwards and overflow from the inner wall of the nozzle in a gap area due to the influence of buoyancy, and only a few parts of small-size bubbles flow out into the crystallizer from the side hole along with the molten steel.
And after casting is finished, carrying out layer-by-layer planing detection on the casting blank. After the nozzle is used, the number of bubbles in the casting blank within 15mm of the surface layer of the casting blank is reduced from 73 to 2, and the surface quality is greatly improved.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (4)
1. A submerged entry nozzle, comprising: a submerged entry nozzle body;
the interior fluid containing chamber of immersion nozzle body includes: the submerged nozzle comprises a fluid inlet, an upper cavity, a lower cavity and a fluid outlet formed in the side wall of the lower portion of the submerged nozzle body, wherein the fluid inlet is communicated with the upper cavity, the fluid outlet is communicated with the lower cavity, and the lower end of the submerged nozzle body is of a sealed structure;
the ratio of the area of the cross section of the lower cavity to the area of the cross section of the upper cavity is 1.2-3;
an arc-shaped connecting part is arranged between the upper containing cavity and the lower containing cavity;
the upper and lower chambers are both cylindrical structures.
2. The submerged entry nozzle of claim 1, characterized in that the inner diameter of the upper plenum ranges: 50 mm-120 mm, the inner diameter range of the lower cavity is 90 mm-250 mm, and the height range is 750 mm-1250 mm.
3. The submerged entry nozzle of claim 1, characterized in that: the lower edge of the fluid outlet is 100 mm-150 mm away from the bottom end of the submerged nozzle body, and the height of the fluid outlet is 80 mm-100 mm.
4. The submerged entry nozzle of claim 1, characterized in that: the thickness of the refractory material in the submerged nozzle body is 20 mm-35 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911004566.0A CN110732663B (en) | 2019-10-22 | 2019-10-22 | Immersion type water gap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911004566.0A CN110732663B (en) | 2019-10-22 | 2019-10-22 | Immersion type water gap |
Publications (2)
| Publication Number | Publication Date |
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| CN110732663A CN110732663A (en) | 2020-01-31 |
| CN110732663B true CN110732663B (en) | 2021-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911004566.0A Active CN110732663B (en) | 2019-10-22 | 2019-10-22 | Immersion type water gap |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1101325A1 (en) * | 1983-01-06 | 1984-07-07 | Центральный научно-исследовательский институт черной металлургии им.И.П.Бардина | Metal feeding device |
| JPH1128555A (en) * | 1997-07-03 | 1999-02-02 | Toshiba Ceramics Co Ltd | Immersion nozzle for continuous casting |
| JP3802866B2 (en) * | 2002-11-01 | 2006-07-26 | 新日本製鐵株式会社 | Immersion nozzle for continuous casting |
| CN2863317Y (en) * | 2006-01-10 | 2007-01-31 | 张子益 | Sprue with multi-tapping |
| CN109570482B (en) * | 2018-12-06 | 2021-04-13 | 莱芜钢铁集团银山型钢有限公司 | Crystallizer submerged nozzle for single-point non-equilibrium protection casting of beam blank and using method |
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