CN113000831A - Submerged nozzle with horn-shaped outlet and using method thereof - Google Patents
Submerged nozzle with horn-shaped outlet and using method thereof Download PDFInfo
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- CN113000831A CN113000831A CN202110201654.0A CN202110201654A CN113000831A CN 113000831 A CN113000831 A CN 113000831A CN 202110201654 A CN202110201654 A CN 202110201654A CN 113000831 A CN113000831 A CN 113000831A
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- water gap
- nozzle
- inner diameter
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- shaped 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 application discloses take immersion nozzle of tubaeform export and application method thereof includes from top to bottom in proper order: the nozzle comprises a nozzle clamp, a nozzle conical section, a nozzle vertical section and a horn-shaped outlet; the upper inner diameter of the inner cavity of the water gap chuck is 100-120 mm, the lower inner diameter is 30-40 mm, and the length is 60-80 mm; the length of the water gap conical section is 360-500 mm, and the lower inner diameter of the inner cavity of the water gap conical section is 20-30 mm; the length of the vertical section of the water gap is 180-220 mm, and the outer diameter is 60-80 mm; the curvature radius of the trumpet-shaped outlet is 500-1500 mm, and the length of the trumpet-shaped outlet is 90-110 mm. When the billet drawing speed is 2.4-2.8 m/min, the depth of the water gap inserted into the molten steel is 110-120 mm, when the erosion depth of the water gap is more than or equal to 10mm, the water gap is lifted upwards, and the insertion depth is changed into 90-100 mm. The method can improve the water gap utilization rate, can stabilize the flow field in the crystallizer, and has direct significance for improving the casting blank quality and stabilizing the production.
Description
Technical Field
The invention relates to the field of small square billet continuous casting, in particular to a submerged nozzle with a horn-shaped outlet and a using method thereof.
Background
The submerged nozzle for the continuous casting crystallizer is a refractory material sleeve for protecting casting, which is arranged at the lower part of a tundish and inserted below the liquid level of crystallizer steel, is the last refractory material product used in the steelmaking-continuous casting process and mainly has the following functions: firstly, the contact between the molten steel and air is isolated, and the secondary oxidation of the molten steel is prevented; improving the flowing state of the molten steel in the crystallizer and promoting the floating of impurities; and thirdly, the impact of the steel flow on the liquid level of the crystallizer is slowed down, slag entrapment is prevented, the lubricating stability between the crystallizer and the surface of the casting blank is improved, the uniform solidification of the blank shell is promoted, and the surface quality of the casting blank is improved.
When the conventional nozzle is adopted for pouring, the molten steel impact force at the outlet of the nozzle is too large, so that the impact is easily caused to the initially solidified shell in the crystallizer, the risk of steel leakage is increased, meanwhile, the overflow is too strong, the fluctuation of the liquid level is caused, the problems of meniscus damage and slag entrapment are caused, and the uniform solidification of the shell and the stable smooth production are influenced.
For a straight cylinder type submerged nozzle, molten steel is continuously thinned in the process of flow injection, so that a gap is formed between the molten steel and the inner wall of the nozzle. Because of the existence of negative pressure, the air can be inhaled like the aspiration pump in the space between molten steel and the mouth of a river inner wall, causes molten steel secondary oxidation and mouth of a river bias flow, influences the continuous casting billet quality.
In the production process, after the submerged nozzle is inserted into the molten steel, the slag line and the casting powder in the crystallizer can carry out long-time physicochemical reaction, so that the nozzle is seriously eroded at the position of the slag line, the production rhythm can be disturbed when the nozzle is replaced, and the production efficiency is influenced. If the submerged nozzle is broken at the slag line, the steel leakage of the billet shell can be caused, and the continuous casting production can be seriously influenced.
Disclosure of Invention
The invention aims to provide a submerged nozzle with a flared outlet and a using method thereof, so as to overcome the defects in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a take immersion nozzle of tubaeform export, includes from top to bottom in proper order: the nozzle comprises a nozzle clamp, a nozzle conical section, a nozzle vertical section and a horn-shaped outlet; the upper inner diameter of the inner cavity of the water gap chuck is 100-120 mm, the lower inner diameter is 30-40 mm, and the length is 60-80 mm; the length of the water gap conical section is 360-500 mm, and the lower inner diameter of the inner cavity of the water gap conical section is 20-30 mm; the length of the vertical section of the water gap is 180-220 mm, and the outer diameter is 60-80 mm; the curvature radius of the trumpet-shaped outlet is 500-1500 mm, and the length of the trumpet-shaped outlet is 90-110 mm.
Preferably, the upper inner diameter of the tapered section of the nozzle is consistent with the lower inner diameter of the nozzle chuck.
Preferably, the upper inner diameter of the vertical section of the nozzle is consistent with the lower inner diameter of the conical section of the nozzle.
Preferably, the length of the water gap main body is 600-800 mm.
Preferably, a slag line is arranged on the outer side of the vertical section of the water gap, the upper end and the lower end of the slag line are respectively flush with the upper end and the lower end of the vertical section of the water gap, the thickness of the slag line is 4-6 mm, and fillets with the radius of 2-3 mm are respectively formed at edges and corners of the slag line and seams of the slag line and the water gap.
In order to realize another purpose of the invention, the invention provides a using method of the submerged nozzle with the horn-shaped outlet, when the pulling speed of the billet is 2.4-2.8 m/min, the depth of the nozzle inserted into the molten steel is 110-120 mm, when the erosion depth of the nozzle is more than or equal to 10mm, the nozzle is lifted, and the insertion depth is changed into 90-100 mm.
Compared with the prior art, the invention has the following beneficial effects:
(1) the lower end of the water gap is provided with the horn-shaped outlet, so that the impact of high-temperature molten steel in the crystallizer is reduced, the slag entrapment of the molten steel is prevented, the uniform solidification of a billet shell is promoted, and the risk of steel leakage is reduced;
(2) the inner cavity of the tapered section of the water gap is set to have a certain taper, so that the molten steel is prevented from generating a gap with the inner cavity of the water gap in the process of injecting the molten steel, and the secondary oxidation of the molten steel and the bias flow of the water gap caused by air suction are avoided;
(3) through increasing slag line thickness, improve the erosion resistance ability of slag line, adjust the mouth of a river depth of insertion, the life of extension immersion nozzle, simultaneously at slag line upper and lower end radius angle, prevent that the mouth of a river from producing stress concentration and to the fish tail of personnel and work piece.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a cross-sectional axial view of a submerged entry nozzle with a flared outlet according to an embodiment of the present invention;
FIG. 2 is a sectional view of an axial section of a slag line upper end fillet of a submerged nozzle with a flared outlet according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a comparison between a submerged entry nozzle with a flared outlet and a conventional nozzle downstream flow field according to an embodiment of the present invention;
FIG. 4 is a comparative view of a flow field of a submerged nozzle with a flared outlet according to an embodiment of the present invention at different insertion depths;
FIG. 5 is a comparative view of a flow field of a submerged nozzle with a flared outlet at different throwing speeds according to an embodiment of the present invention;
fig. 6 is a comparative view of the flow field of a submerged nozzle with a flared outlet according to an embodiment of the present invention at different radii of curvature.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
Referring to fig. 1-2, the present application provides a submerged nozzle with a flared outlet and a method for using the same, wherein the flared outlet 9 is disposed in an inner cavity of a lower end of the submerged nozzle, and has a radius of curvature of 1000mm and a length of 100 mm.
The length of the nozzle main body is 700mm, the upper inner diameter of the inner cavity 4 of the nozzle chuck 1 is 110mm, the lower inner diameter is 35mm, and the length is 70 mm.
The length of the nozzle conical section 2 is 430mm, the lower inner diameter of the inner cavity 5 of the nozzle conical section is 25mm, and the upper inner diameter of the nozzle conical section is equal to the lower inner diameter of the inner cavity 4 of the nozzle chuck.
The length of the nozzle vertical section 3 is 200mm, the outer diameter is 70mm, and the upper inner diameter is equal to the lower inner diameter of the inner cavity 5 of the nozzle conical section. The length of the slag line 7 is 200mm, the thickness is 5mm, and the fillet with the radius of 2mm is all chamfered at the joint of the slag line edge angle, the slag line and the water gap main body.
On a 6-flow billet caster, 35K of cold forging steel is cast at a drawing speed of 2.6m/min, the superheat degree of a tundish is 30 ℃, and the casting section is 140mm multiplied by 140 mm. During casting, the standard reaching rate of the crystallizer liquid level fluctuation within the range of +/-7 mm is improved to 99% from the original 94%, the fluctuation of the liquid level of the molten steel is reduced, the vibration marks of the continuous casting billet are regular, the surface quality is good, and the problems of subcutaneous bubbles, slag inclusion and the like are solved. The depth of the water gap inserted into the molten steel is adjusted to be 120mm in the early stage, the water gap is lifted upwards when the erosion depth of the water gap is more than or equal to 10mm after casting for 12 hours, and the insertion depth is changed to be 90 mm. Finally, the same position of the water gap is prevented from being eroded by the protective slag all the time, the casting time of the submerged nozzle is prolonged to 20 hours from the original 12 hours, the utilization rate of the submerged nozzle is greatly improved, and the method has direct significance for improving the quality of casting blanks and stabilizing the production.
Referring to fig. 3, under the conditions that the pulling rate is 2.6m/min and the insertion depth of the water gap is 100mm, the influence of the common water gap and the water gap of the invention on the crystallizer flow field is shown. The impact depth of the common water port is obviously deeper than that of the water port of the invention at medium and high pulling speeds.
And as shown in the combined figure 4, under the conditions that the pulling speed is 2.6m/min and the curvature radius of the flared outlet is 1000mm, the insertion depths of different flared water gaps have influence on the crystallizer flow field. When the insertion depth is 80mm, the impact of the molten steel on the near-wall surface is large. With the increase of the insertion depth, when the insertion depth is 90mm or more, the molten steel flowing out from the water gap mainly forms downward flow, and the influence on the near wall surface is small.
Referring to fig. 5, under the condition that the insertion depth of the trumpet-shaped water port is 100mm and the curvature radius of the trumpet-shaped outlet is 1000mm, the influence of different pulling speeds on the crystallizer flow field is shown. The drawing speed is 2.4-2.8 m/min, the molten steel flowing out from the water gap mainly forms downward flow, the influence on the near wall surface is small, and the impact depth difference under different drawing speeds is small.
As shown in the combined graph 6, under the conditions that the pulling speed is 2.6m/min and the insertion depth of the flared water port is 100mm, the curvature radiuses of different flared outlets have influence on the flow field of the crystallizer. The radius of curvature of the flared outlet is 500-1500 mm, molten steel flowing out from a water gap mainly forms downward flow, the influence on the wall surface is small, the impact depth is increased firstly and then reduced, and the maximum value is reached when the radius of curvature is 1250 mm.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a detailed description of the present application, and it should be noted that modifications and embellishments could be made by those skilled in the art without departing from the principle of the present application, and these should also be considered as the protection scope of the present application.
Claims (3)
1. The utility model provides a take immersion nozzle of tubaeform export and application method thereof which characterized in that: from top to bottom include in proper order: the nozzle comprises a nozzle clamp, a nozzle conical section, a nozzle vertical section and a horn-shaped outlet; the upper inner diameter of the inner cavity of the water gap chuck is 100-120 mm, the lower inner diameter is 30-40 mm, and the length is 60-80 mm; the length of the water gap conical section is 360-500 mm, and the lower inner diameter of the inner cavity of the water gap conical section is 20-30 mm; the length of the vertical section of the water gap is 180-220 mm, and the outer diameter is 60-80 mm; the curvature radius of the trumpet-shaped outlet is 500-1500 mm, and the length of the trumpet-shaped outlet is 90-110 mm. When the billet drawing speed is 2.4-2.8 m/min, the depth of the water gap inserted into the molten steel is 110-120 mm, when the erosion depth of the water gap is more than or equal to 10mm, the water gap is lifted upwards, and the insertion depth is changed into 90-100 mm.
2. The submerged entry nozzle with the flared outlet and the use method thereof of claim 1, wherein: the upper inner diameter of the tapered section of the water gap is consistent with the lower inner diameter of the water gap chuck; the upper inner diameter of the vertical section of the water gap is consistent with the lower inner diameter of the conical section of the water gap; the length of the water gap main body is 600-800 mm.
3. The submerged entry nozzle with the flared outlet and the use method thereof of claim 1, wherein: the outer side of the vertical section of the water gap is provided with a slag line, the upper end and the lower end of the slag line are respectively flushed with the upper end and the lower end of the vertical section of the water gap, the thickness of the slag line is 4-6 mm, and the fillet with the radius of 2-3 mm is uniformly rounded at the edge angle of the slag line, the slag line and the seam of the water gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110201654.0A CN113000831B (en) | 2021-02-23 | 2021-02-23 | Submerged nozzle with horn-shaped outlet and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110201654.0A CN113000831B (en) | 2021-02-23 | 2021-02-23 | Submerged nozzle with horn-shaped outlet and using method thereof |
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| CN113000831A true CN113000831A (en) | 2021-06-22 |
| CN113000831B CN113000831B (en) | 2022-04-29 |
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Citations (10)
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| JP2002336943A (en) * | 2001-05-11 | 2002-11-26 | Nippon Steel Corp | Continuous casting method |
| JP2004025223A (en) * | 2002-06-25 | 2004-01-29 | Akechi Ceramics Co Ltd | Nozzle for continuous casting |
| CN102363213A (en) * | 2011-11-04 | 2012-02-29 | 中国重型机械研究院有限公司 | Hydraulic dynamic adjustment slag line system |
| CN202701369U (en) * | 2012-08-03 | 2013-01-30 | 新疆八一钢铁股份有限公司 | Steel ladle long nozzle for preventing cold steel from being adhesive |
| CN104057077A (en) * | 2014-07-08 | 2014-09-24 | 华耐国际（宜兴）高级陶瓷有限公司 | High-pulling-speed sheet billet immersion-type water opening |
| CN104084551A (en) * | 2014-07-30 | 2014-10-08 | 攀钢集团攀枝花钢钒有限公司 | Method for controlling continuous casting tundish submersed nozzle |
| CN110170641A (en) * | 2019-06-04 | 2019-08-27 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of square billet hyperbolic-type submersed nozzle and preparation method thereof |
| CN209647586U (en) * | 2018-12-10 | 2019-11-19 | 青岛正望钢水控制股份有限公司 | A kind of long nozzle for continuous casting |
| JP2020062653A (en) * | 2018-10-16 | 2020-04-23 | 明智セラミックス株式会社 | Long nozzle for continuous casting |
| CN112122605A (en) * | 2020-10-15 | 2020-12-25 | 江苏高鑫高温新材料科技有限公司 | Tundish water inlet with excellent thermal stability and good erosion resistance |
-
2021
- 2021-02-23 CN CN202110201654.0A patent/CN113000831B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002336943A (en) * | 2001-05-11 | 2002-11-26 | Nippon Steel Corp | Continuous casting method |
| JP2004025223A (en) * | 2002-06-25 | 2004-01-29 | Akechi Ceramics Co Ltd | Nozzle for continuous casting |
| CN102363213A (en) * | 2011-11-04 | 2012-02-29 | 中国重型机械研究院有限公司 | Hydraulic dynamic adjustment slag line system |
| CN202701369U (en) * | 2012-08-03 | 2013-01-30 | 新疆八一钢铁股份有限公司 | Steel ladle long nozzle for preventing cold steel from being adhesive |
| CN104057077A (en) * | 2014-07-08 | 2014-09-24 | 华耐国际（宜兴）高级陶瓷有限公司 | High-pulling-speed sheet billet immersion-type water opening |
| CN104084551A (en) * | 2014-07-30 | 2014-10-08 | 攀钢集团攀枝花钢钒有限公司 | Method for controlling continuous casting tundish submersed nozzle |
| JP2020062653A (en) * | 2018-10-16 | 2020-04-23 | 明智セラミックス株式会社 | Long nozzle for continuous casting |
| CN209647586U (en) * | 2018-12-10 | 2019-11-19 | 青岛正望钢水控制股份有限公司 | A kind of long nozzle for continuous casting |
| CN110170641A (en) * | 2019-06-04 | 2019-08-27 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of square billet hyperbolic-type submersed nozzle and preparation method thereof |
| CN112122605A (en) * | 2020-10-15 | 2020-12-25 | 江苏高鑫高温新材料科技有限公司 | Tundish water inlet with excellent thermal stability and good erosion resistance |
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| CN113000831B (en) | 2022-04-29 |
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