CN110976833B - Quick-change cooling device and quick-change process for large-shrinkage steel grade hot tundish - Google Patents
Quick-change cooling device and quick-change process for large-shrinkage steel grade hot tundish Download PDFInfo
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- CN110976833B CN110976833B CN201911144024.3A CN201911144024A CN110976833B CN 110976833 B CN110976833 B CN 110976833B CN 201911144024 A CN201911144024 A CN 201911144024A CN 110976833 B CN110976833 B CN 110976833B
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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
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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
- B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
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Abstract
The invention relates to a quick-change cooling device and a quick-change process for a hot tundish of a large-shrinkage steel grade, and belongs to the technical field of continuous casting equipment in the metallurgical industry. The technical scheme is as follows: contain support (1), metal grid (2), support column (3) and rings (4), support (1) is the back taper, and rings (4) are fixed in the upper end of support (1), and multilayer metal grid (2) are fixed from top to bottom in support (1), and metal grid (2) of lower floor are equipped with support column (3), and the lower extreme at support (1) is fixed in support column (3). When the tundish is replaced, the device is inserted into the crystallizer, the depth of the bracket (1) inserted into the molten steel is 250 +/-10 mm, and the upper end of the bracket (1) is exposed between the liquid level of the molten steel and the upper opening of the crystallizer. The invention has the beneficial effects that: the vicious production accidents of bleed-out, horizontal blank, blank breaking and the like caused by improper quick change operation control of high-silicon, high-aluminum and high-carbon large-shrinkage steel grades can be avoided.
Description
Technical Field
The invention relates to a quick-change cooling device and a quick-change process for a hot tundish of a high-shrinkage steel grade, in particular to a quick-change cooling device and a quick-change process for a hot tundish of a high-silicon, high-aluminum and high-carbon steel grade with a large shrinkage, belonging to the technical field of continuous casting equipment in the metallurgical industry.
Background
With the development needs of continuous casting industry and the continuous development of high-efficiency continuous casting machines, the service life of a continuous casting tundish directly influences the improvement of the operation rate of the continuous casting machine, and although various methods for prolonging the service life of the tundish are adopted at present, the effect of long-time continuous casting cannot be achieved.
The quick change technology of the hot tundish effectively solves the problem, and the basic principle of the quick change technology of the hot tundish is to buffer the preparation and change time of the tundish by utilizing the molten steel capacity of the tundish and optimizing the pouring speed, and carry out the quick change of the hot tundish under the basic conditions and the limitation of ensuring the continuous production so as to realize the continuity of pouring and ensure the pouring safety of the tundish. Therefore, the hot quick-change tundish technology can effectively reduce the production preparation time, improve the operation rate of the casting machine, increase the productivity of the casting machine, improve the overall production efficiency and reduce the comprehensive production cost. However, in the production and application process of the technology, certain accident risks exist, particularly for high-silicon, high-aluminum and high-carbon type high-shrinkage steel types such as silicon steel, stainless steel, high-carbon steel, ultra-high carbon steel and ultra-high strength steel, severe production accidents such as steel leakage, blank falling and blank breaking are often caused due to improper quick-change operation control, so that a continuous casting tundish quick-change process is cancelled for the high-silicon, high-aluminum and high-carbon type high-shrinkage steel types, the steel types are often high-precision star products of enterprises, and the steel types can not be subjected to tundish quick-change continuous casting, so that the production efficiency is reduced and the production cost is increased.
Disclosure of Invention
The invention aims to provide a quick-change cooling device and a quick-change process for a hot tundish of a high-shrinkage steel grade, which can avoid vicious production accidents of bleed-out, horizontal blank, blank breakage and the like caused by improper quick-change operation control of high-silicon, high-aluminum and high-carbon high-shrinkage steel grades such as silicon steel, stainless steel, high-carbon steel, ultrahigh-strength steel and the like, and solve the problems in the background art.
The technical scheme of the invention is as follows:
the utility model provides a package quick change cooling device in middle of big shrinkage steel grade heat, contains support, metal grating, support column and rings, the support is the back taper, and the cross section of support is the rectangle, and rings are fixed in the upper end of support, and multilayer metal grating fixes in the support from top to bottom, and the metal grating of lower floor is equipped with the support column, the support column coincides with the central line of support, and the lower extreme at the support is fixed to the support column.
The support is formed by welding reinforcing steel bars, the length of the upper end of the support is one half of the length of the crystallizer, and the width of the upper end of the support is two thirds of the length of the crystallizer.
The mesh size of the metal grid is 3-10mm2。
A quick-change process for a large-shrinkage steel grade hot tundish adopts the above-defined quick-change cooling device for the large-shrinkage steel grade hot tundish, and comprises the following steps:
stopping pouring the tundish when the liquid level of molten steel in the tundish or the weight of the molten steel in the tundish meets the tundish replacement condition;
secondly, after the tundish is stopped to be poured, controlling the liquid level of the crystallizer to be 150-200 mm away from the upper opening of the crystallizer;
thirdly, inserting the large-shrinkage steel grade hot tundish quick-change cooling device into the crystallizer, so that the depth of the bracket inserted into the molten steel is 250 +/-10 mm, and the upper end of the bracket is exposed between the liquid level of the molten steel and the upper opening of the crystallizer;
fourthly, replacing the tundish while inserting the quick-change cooling device of the hot tundish with large shrinkage into the crystallizer, wherein the seedling emergence time of the replaced tundish is as follows: t =20+ (L-900)/100 × 3 ± 5s, wherein L-casting blank width mm, t-emergence time s;
fifthly, when the level of the molten steel of the tundish after replacement meets the casting process condition of the tundish, the continuous casting machine starts casting, when the casting speed of the casting machine is lower than 0.6m/min, the specific water quantity of the secondary cooling of the continuous casting machine is 0.2-0.4l/kg, and the cooling intensity is 30-60l/m2And min, when the casting machine drawing speed is more than or equal to 0.6m/min, performing secondary cooling of the continuous casting machine according to a normal secondary cooling process.
And step three, before the large-shrinkage steel grade hot tundish quick-change cooling device is inserted into the crystallizer, baking is firstly carried out, so that the surface temperature of the large-shrinkage steel grade hot tundish quick-change cooling device is not less than 100 ℃.
And step three, controlling the time for inserting the large-shrinkage steel grade hot tundish quick-change cooling device into the crystallizer within 10 seconds.
The invention has the beneficial effects that:
(1) the quick-change cooling device for the large-shrinkage steel grade hot tundish adopts deformed steel bar and waste metal grids as cooling materials, belongs to secondary utilization, and saves cost;
(2) the large-shrinkage steel grade hot tundish quick-change cooling device is baked before use, so that the steel grade hot tundish quick-change cooling device is prevented from being inserted into molten steel after being wetted to cause explosion and scalding;
(3) the quick-change cooling device for the large-shrinkage steel grade hot tundish can accelerate the cooling and solidification of molten steel in the crystallizer, and prevent the accidents of breakage and leakage of the joint;
(4) in the process of inserting the large-shrinkage steel grade hot tundish quick-change cooling device into the crystallizer, an operator can also judge whether tundish steel slag is mixed into the crystallizer, and the specific method is as follows: when the device is inserted into a crystallizer, if the device directly sinks or cannot be fixed in the crystallizer, the fact that the part of molten steel inserted into the device is not a solidified primary blank shell but slag of a tundish indicates that the crystallizer is filled with slag, and casting should be stopped at the moment, so that the serious safety accident of molten steel explosion of the crystallizer during casting starting and the serious production accident of steel leakage of the crystallizer after casting starting are avoided;
(5) by adopting a tundish quick-change process, the shrinkage of a billet shell can be reduced, and extrusion caused by excessive infiltration of molten steel is prevented, so that the billet shell is broken, the taper of a crystallizer is changed, and steel leakage and other quality accidents are caused;
(6) the specific water quantity and the cooling intensity of the secondary cooling of the continuous casting machine are controlled, the phenomenon that the temperature of molten steel in a crystallizer is reduced too fast during quick change operation, the blank drawing resistance is increased, bulging between blank rollers caused by uneven local temperature return is avoided, and the phenomenon that the intensity is too high after the local supercooling of a casting blank, so that accidents of blank lying and blank breaking are caused is avoided.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a schematic view of the stent structure of the present invention;
in the figure: support 1, metal grid 2, support column 3, rings 4.
Detailed Description
The invention is further illustrated by way of example in the following with reference to the accompanying drawings.
Referring to the attached drawings 2 and 3, the quick-change cooling device for the large-shrinkage steel grade hot tundish comprises a support 1, a metal grid 2, support columns 3 and lifting rings 4, wherein the support 1 is in an inverted cone shape, the cross section of the support 1 is in a rectangular shape, the lifting rings 4 are fixed at the upper end of the support 1, the multi-layer metal grid 2 is fixed in the support 1 from top to bottom, the metal grid 2 at the lowest layer is provided with the support columns 3, the support columns 3 coincide with the central line of the support 1, and the support columns 3 are fixed at the lower end of the support 1.
In this embodiment, referring to fig. 2 and 3, the bracket 1 is formed by welding thread steel scraps with a diameter of 2-3cm, the height b of the bracket 1 is 350 ± 30mm, the length a is 1/2 of the length of the crystallizer, and the width c is 2/3 of the width of the crystallizer. The upper part is provided with a bent beam.
The metal grid 2 as cooling material is rectangular grid-shaped welded by waste steel wires, and the mesh of the metal grid is 3-10mm2The support column 3 and the hanging ring 4 are made of steel bars.
Referring to fig. 1, the hot tundish quick-change operation of the non-oriented silicon steel is as follows:
and immediately carrying out ladle returning operation after the ladle of the previous furnace is completely poured. When the steel in the tundishWhen the water weight is 21t, reducing the working pulling speed to 0.6m/min, and starting the weak cooling process of the joint mark blank, namely adjusting the specific water amount of the continuous casting secondary cooling water to 0.38 l/kg; the cooling intensity was controlled to 54l/m2Min. When the liquid level of the tundish is close to 300mm, namely the molten steel in the tundish is weighed to be 11t, stopping withdrawal and straightening, pumping into a blind plate to stop casting, and controlling the liquid level of the crystallizer to be 150-200 mm away from the upper opening of the crystallizer when the casting is stopped.
Immediately inserting a large-shrinkage steel grade hot tundish quick-change cooling device with the surface temperature not lower than 100 ℃ after baking into a crystallizer after a casting machine stops casting, hooking a hanging ring 4 by using a small steel bar during insertion, enabling a support 1 to be centrally inserted into the crystallizer, enabling the depth of the support 1 inserted into molten steel to be 250 +/-10 mm, exposing the upper end of the support 1 to the molten steel level of 100 +/-10 mm, and enabling the upper end of the support 1 to be 150 +/-10 mm away from the bottom of a water gap. The slag is not fished, and the thickness of the black slag in the crystallizer is kept to be 30 mm.
After stopping pouring, simultaneously pressing a 'preheating position' button, lifting a tundish to be replaced and moving the tundish out of a pouring position, simultaneously opening another tundish to the pouring position, immediately descending to a submerged nozzle shunting hole after the replaced tundish is in place, pouring when the liquid level of the molten steel of the replaced tundish is higher than 310mm, opening the tundish to keep the molten steel flowing in the tundish, and clicking the liquid level of the molten steel by a steel bar to prevent the liquid level from crusting. And (4) starting withdrawal and straightening after the seedling emergence time reaches 30 seconds, wherein the starting withdrawal speed is 0.3 m/min. Keeping for about 2min, increasing the pulling speed to 0.4m/min, after slag changing operation, increasing the pulling speed to 0.6m/min, starting a normal secondary cooling mode, then performing speed increasing operation according to normal conditions, finishing the hot and quick change of the tundish, and controlling the time of the whole process within 3 minutes.
Claims (3)
1. A quick change process for a hot tundish of a large-shrinkage steel grade is characterized in that: the package quick change cooling device in middle of the big shrinkage steel grade heat that adopts contains support (1), metal grid (2), support column (3) and rings (4), support (1) are the back taper, and the cross section of support (1) is the rectangle, and rings (4) are fixed in the upper end of support (1), and multilayer metal grid (2) are arranged from top to bottom and are fixed in support (1), and metal grid (2) of lower floor are equipped with support column (3), support column (3) and the coincidence of the central line of support (1), support column (3) are fixed at the lower extreme of support (1), contain following step:
stopping pouring the tundish when the liquid level of molten steel in the tundish or the weight of the molten steel in the tundish meets the tundish replacement condition;
secondly, after the tundish is stopped to be poured, controlling the liquid level of the crystallizer to be 150-200 mm away from the upper opening of the crystallizer;
thirdly, inserting the large-shrinkage steel grade hot tundish quick-change cooling device into the crystallizer, so that the depth of the bracket (1) inserted into the molten steel is 250 +/-10 mm, and the upper end of the bracket (1) is exposed between the liquid level of the molten steel and the upper opening of the crystallizer;
fourthly, replacing the tundish while inserting the quick-change cooling device of the hot tundish with large shrinkage into the crystallizer, wherein the seedling emergence time of the replaced tundish is as follows: t =20+ (L-900)/100 × 3 ± 5s, wherein L-casting blank width mm, t-emergence time;
fifthly, when the level of the molten steel of the tundish after replacement meets the casting process condition of the tundish, the continuous casting machine starts to cast, when the casting speed of the casting machine is lower than 0.6m/min, the specific water quantity of the secondary cooling of the continuous casting machine is 0.2-0.4l/kg, and the cooling intensity is 30-60 l/(m/min)2Min), when the casting machine drawing speed is more than or equal to 0.6m/min, the secondary cooling of the continuous casting machine is carried out according to a normal secondary cooling process.
2. The process of claim 1, wherein the process comprises the following steps: and step three, before the large-shrinkage steel grade hot tundish quick-change cooling device is inserted into the crystallizer, baking is firstly carried out, so that the surface temperature of the large-shrinkage steel grade hot tundish quick-change cooling device is not less than 100 ℃.
3. The process for quickly replacing the hot tundish of the large-shrinkage steel variety according to claim 1 or 2, wherein the process comprises the following steps: and step three, controlling the time for inserting the large-shrinkage steel grade hot tundish quick-change cooling device into the crystallizer within 10 seconds.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911144024.3A CN110976833B (en) | 2019-11-20 | 2019-11-20 | Quick-change cooling device and quick-change process for large-shrinkage steel grade hot tundish |
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| CN201911144024.3A CN110976833B (en) | 2019-11-20 | 2019-11-20 | Quick-change cooling device and quick-change process for large-shrinkage steel grade hot tundish |
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| CN110976833B true CN110976833B (en) | 2021-07-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06335756A (en) * | 1993-05-28 | 1994-12-06 | Nippon Steel Corp | Continuous casting method |
| JP3291265B2 (en) * | 1999-02-19 | 2002-06-10 | 三宝伸銅工業株式会社 | Mold for continuous casting machine |
| CN201249265Y (en) * | 2008-05-15 | 2009-06-03 | 宝山钢铁股份有限公司 | Continuous cast slab end casting anti-pouring device |
| CN202527680U (en) * | 2012-01-19 | 2012-11-14 | 宝山钢铁股份有限公司 | Continuous casting rising prevention plug-in unit |
| CN203356552U (en) * | 2013-08-01 | 2013-12-25 | 新疆八一钢铁股份有限公司 | Device for preventing continuous casting tail billet from being concave inward during rapid replacement of continuous casting tundish |
| CN104014782A (en) * | 2014-06-24 | 2014-09-03 | 济钢集团有限公司 | Supporting piece used for preventing fast shrinkage of inner shell of crystallizer and application method thereof |
| CN106475541B (en) * | 2015-08-25 | 2018-11-06 | 宝山钢铁股份有限公司 | The method for preventing continuous casting from even pouring base bleed-out |
| CN105964967B (en) * | 2016-05-20 | 2018-12-14 | 首钢集团有限公司 | A kind of control method in Casting Billet of Highcarbon Steel casting latter stage |
| CN108620546B (en) * | 2017-03-24 | 2020-03-06 | 宝山钢铁股份有限公司 | Plug-in device for preventing continuous casting billet tail billet from rising and using method thereof |
| CN108555274B (en) * | 2018-05-29 | 2023-10-13 | 马鞍山尚元冶金科技有限公司 | Quick-changing method for special-shaped blank tundish |
| CN208276140U (en) * | 2018-05-29 | 2018-12-25 | 马鞍山尚元冶金科技有限公司 | The tundish company's of using instead base component fastly |
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