CN110842186A - Method and device for preventing eddy slag rolling of slab continuous casting crystallizer - Google Patents
Method and device for preventing eddy slag rolling of slab continuous casting crystallizer Download PDFInfo
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- CN110842186A CN110842186A CN201910939330.XA CN201910939330A CN110842186A CN 110842186 A CN110842186 A CN 110842186A CN 201910939330 A CN201910939330 A CN 201910939330A CN 110842186 A CN110842186 A CN 110842186A
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- crystallizer
- continuous casting
- slab continuous
- slag
- nozzle body
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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
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Abstract
The invention relates to a method for preventing eddy slag entrapment of a slab continuous casting crystallizer, which is characterized in that a separation baffle plate is arranged above a steel outlet of a submerged nozzle of the crystallizer to limit an eddy above the separation baffle plate so as to prevent protective slag from being drawn into the deep part of molten steel. The device is characterized in that a partition baffle is arranged above a steel tapping hole of the submerged nozzle body, and the submerged nozzle body and the partition baffle are of an integrated structure. And a reinforcing rib is arranged between the partition baffle and the submerged nozzle body. The narrowest distance between the partition baffle and the inner wall of the crystallizer is 10-100 mm. The liquid level of the molten steel in the crystallizer is prevented from generating vortex in the slab continuous casting process, so that the casting powder is prevented from being involved.
Description
Technical Field
The invention relates to the field of ferrous metallurgy, in particular to a method and a device for preventing eddy slag rolling of a slab continuous casting crystallizer.
Background
In the slab continuous casting process, the liquid level of the molten steel in the crystallizer often generates vortex, and the covering slag on the liquid level is involved into the molten steel, so that the phenomenon of vortex slag inclusion and slag inclusion is determined by the characteristics of a flow field in the crystallizer. The molten steel flowing back upwards from the two narrow sides is arranged in the middle of the crystallizer, namely after the positions near the submerged nozzle collide with each other, the movement direction is changed to form a vortex, the casting powder is rolled into the deep part of the molten steel, and the molten steel flows out along with the submerged nozzle are dispersed into a casting blank (as shown in figure 1).
The involved mold flux remains in the cast slab to form large-particle inclusions, resulting in various inclusion defects of the rolled material, such as: the surface defects of the thin plate for the automobile panel, the flaw detection defects of thick plate steel for shipbuilding, bridges and containers and the like cause steel to be scrapped, and great economic loss is caused. For the problem of slag entrapment, the control can only be carried out by adjusting the outlet angle of a submerged nozzle, blowing argon, stabilizing steel pouring flux and the like at present, but the effect is not ideal, so that no effective method for solving the problem of slag entrapment exists.
A crystallizer submerged nozzle for preventing slag entrapment in a continuous casting slab (application No. CN201020158648.9, published application No. CN 201644781U); the utility model discloses a prevent crystallizer immersion nozzle of continuous casting slab package sediment, including mouth of a river body, delivery port, reposition of redundant personnel seat, the delivery port is two hole bilateral symmetry, establishes the reposition of redundant personnel seat under the mouth of a river, and the delivery port is downward inclination, its characterized in that: the nozzle body (4) is of a reducing structure, the inner aperture of the upper part of the nozzle is phi 60-80mm, the inner aperture of the bottom end of the nozzle is phi 90-100mm, and the downward inclination angle a of the water outlet (1) is 65-80 degrees. The utility model discloses an it is undulant big, the superficial velocity of flow too high because the liquid level that crystallizer immersion nozzle size and pass are unreasonable to lead to has overcome the continuous casting in-process, has effectively prevented being drawn into of covering slag, has reduced defects such as casting blank surface package sediment, clamp sediment. However, the problem that molten steel flowing out of the submerged nozzle flows through downward impact exists, the temperature of the molten steel level in the crystallizer is low, the covering slag in the crystallizer is poor in melting, and the quality of a continuous casting blank is affected.
A continuous casting crystallizer device capable of controlling liquid level flow field and fluctuation (application No. CN200710047480.7, published application No. CN 101219464); discloses a continuous casting crystallizer device capable of controlling liquid level flow field and fluctuation, belonging to the technical field of metal continuous casting process. According to the mechanism of slag entrapment in the crystallizer, the horizontal flow of the metal liquid on the liquid surface of the crystallizer is inhibited, so that the slag entrapment on the liquid surface of the crystallizer is reduced. The main body part of the device is basically the same as that of the traditional common crystallizer, and the difference is that self-consumption metal plates and feeding mechanisms thereof are arranged at two sides above the crystallizer, namely, the self-consumption metal plates are inserted into molten metal entering the crystallizer through straightening rolls, guide rolls and conveying rolls, and finally, a dummy bar pulls out a continuous casting blank. The structure of the device comprises: the casting device comprises a molten metal tundish (1), a submerged nozzle (2), a straightening roller (3), a guide roller (4), a conveying roller (5), a self-consumption metal plate (6), casting slag (7), a casting blank (8), a water-cooled crystallizer (9) and a dummy bar (10). The device can reduce and inhibit the slag entrapment in the crystallizer, thereby improving the quality of the continuous casting blank. The problem that the covering slag is brought into molten steel by consuming a metal plate and the flowing of the covering slag is blocked exists, in addition, the mechanism is complex, the operation difficulty and the production cost are increased, and the requirement cannot be well met.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a device for preventing eddy slag from being rolled up in a crystallizer for slab continuous casting, which can eliminate the eddy generated by the liquid level of molten steel in the crystallizer in the slab continuous casting process, thereby preventing protective slag from being rolled up.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preventing eddy slag entrapment of a slab continuous casting crystallizer comprises the step of arranging a partition baffle plate 0-100mm above a steel outlet of a submerged nozzle of the crystallizer, limiting eddy above the partition baffle plate, and avoiding covering slag from being drawn into the deep part of molten steel.
The narrowest distance between the partition baffle and the inner wall of the crystallizer is 10-100 mm.
The utility model provides a prevent device of sediment is rolled up to slab continuous casting crystallizer vortex, includes immersion nozzle body, tap-hole, and the immersion nozzle body periphery of tap-hole top is equipped with rectangle partition baffle, cuts off and is equipped with the strengthening rib between baffle and the immersion nozzle body, and immersion nozzle body, partition baffle and strengthening rib structure as an organic whole.
And the distance S between the steel tapping hole and the partition baffle is 5-100 mm.
The length L of the partition baffle is 150-500 mm.
The width M of the partition baffle is 100-300 mm.
Compared with the prior art, the invention has the beneficial effects that:
(1) the generation of slag entrapment due to vortex can be avoided.
(2) The structure is simple.
(3) The cost is low.
Drawings
FIG. 1 is a schematic diagram of the vortex slag entrapment of a crystallizer.
FIG. 2 is a schematic view of the anti-vortex submerged nozzle of the crystallizer of the present invention.
FIG. 3 is a top view of the anti-vortex submerged nozzle of the crystallizer of the present invention.
In the figure: the submerged nozzle comprises a submerged nozzle body 1, a partition baffle 2, reinforcing ribs 3, a vortex 4, vortex slag coils 5, molten steel 6, a crystallizer 7 and a steel outlet 8.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
referring to fig. 1 to 3, in the method for preventing the eddy current slag entrapment of the slab continuous casting mold, a partition plate is arranged at a position 0 to 100mm above a steel outlet of a mold immersion nozzle to form the eddy current prevention immersion nozzle, the length and width directions of the partition plate are consistent with those of the mold, and the eddy is limited above the partition plate to prevent the mold powder from being entrapped into the deep part of molten steel. The narrowest distance between the partition baffle and the inner wall of the crystallizer is 10-100 mm.
Prevent vortex immersion nozzle, including immersion nozzle body 1, tap-hole 8, the 1 periphery of immersion nozzle body above tap-hole 8 is equipped with rectangle partition baffle 2, cuts off and is equipped with strengthening rib 3 between baffle 2 and the immersion nozzle body 1, and immersion nozzle body 1, partition baffle 2 and strengthening rib 3 structure as an organic whole. The distance S between the steel tapping hole 8 and the partition baffle 2 is 5-100 mm. The length L of the partition baffle 2 is 150-500 mm. The width M of the partition baffle 2 is 100-300 mm.
Example 1:
the IF steel plate blank for the continuous casting automobile panel has the section length of a crystallizer: 1520mm, thickness: 305 mm.
A method for preventing eddy slag entrapment of a slab continuous casting crystallizer specifically comprises the following steps:
1. manufacturing anti-vortex submersed nozzle, including submersed nozzle body, tap-hole, the submersed nozzle body periphery of tap-hole top is equipped with rectangle partition baffle, cuts off and is equipped with the strengthening rib between baffle and the submersed nozzle body, and submersed nozzle body, partition baffle and strengthening rib structure as an organic whole. S is 70mm, L is 350mm, and M is 200 mm.
2. Baking an anti-vortex submersed nozzle before continuous casting begins;
3. installing an anti-vortex submersed nozzle on the tundish and probing into the crystallizer;
4. and starting continuous casting.
The surface defect incidence rate of the produced automobile panel is reduced by 60 percent and is reduced to be below 0.9 percent.
Example 2:
continuously casting a ship plate steel slab. Length of section of crystallizer: 1620mm, thickness: 235 mm.
1. Manufacturing anti-vortex submersed nozzle, including submersed nozzle body, tap-hole, the submersed nozzle body periphery of tap-hole top is equipped with rectangle partition baffle, cuts off and is equipped with the strengthening rib between baffle and the submersed nozzle body, and submersed nozzle body, partition baffle and strengthening rib structure as an organic whole. S is 73mm, L is 370mm, and M is 180 mm.
2. Baking an anti-vortex submersed nozzle before continuous casting begins;
3. installing an anti-vortex submersed nozzle on the tundish and probing into the crystallizer;
4. and starting continuous casting.
The incidence of flaw detection defects in the produced ship plate steel is reduced by 70 percent and is reduced to be below 0.05 percent.
The foregoing is considered as illustrative only of the principles of the invention and is not to be in any way limiting, since all equivalent changes and modifications are intended to be included within the scope of the appended claims.
Claims (5)
1. A method for preventing eddy slag entrapment of a slab continuous casting crystallizer is characterized in that a partition baffle is arranged above a steel outlet of a submerged nozzle of the crystallizer to limit eddy above the partition baffle, so that protective slag is prevented from being caught in the deep part of molten steel.
2. The method for preventing the eddy current slag entrapment of the slab continuous casting mold as claimed in claim 1, wherein the narrowest distance between the partition plate and the inner wall of the mold is 10-100 mm.
3. The device for preventing the eddy slag entrapment of the slab continuous casting crystallizer is characterized in that a partition baffle is arranged above a steel outlet of an immersion nozzle body, and the immersion nozzle body and the partition baffle are of an integrated structure.
4. The apparatus for preventing the eddy current slag entrapment in the slab continuous casting mold as claimed in claim 3, wherein the distance S between the tap hole and the blocking plate is 5 to 100mm, the length L of the blocking plate is 150 to 500mm, and the width M of the blocking plate is 100 to 300 mm.
5. The apparatus for preventing the eddy current slag entrapment in the slab continuous casting mold as claimed in claim 3, wherein a reinforcing rib is provided between the partition plate and the submerged nozzle body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910939330.XA CN110842186B (en) | 2019-09-30 | 2019-09-30 | Method and device for preventing eddy slag rolling of slab continuous casting crystallizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910939330.XA CN110842186B (en) | 2019-09-30 | 2019-09-30 | Method and device for preventing eddy slag rolling of slab continuous casting crystallizer |
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| CN110842186A true CN110842186A (en) | 2020-02-28 |
| CN110842186B CN110842186B (en) | 2022-02-18 |
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| CN201910939330.XA Active CN110842186B (en) | 2019-09-30 | 2019-09-30 | Method and device for preventing eddy slag rolling of slab continuous casting crystallizer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113042699A (en) * | 2021-03-16 | 2021-06-29 | 北部湾大学 | Method for judging air blowing slag entrapment of slab crystallizer |
| CN114799150A (en) * | 2022-04-24 | 2022-07-29 | 湖南华菱涟源钢铁有限公司 | Wave suppression method for continuous casting of square billets |
| CN114888270A (en) * | 2022-05-09 | 2022-08-12 | 湖南华菱涟源钢铁有限公司 | Slab continuous casting high-pulling-speed reverse inclined hole type wave suppression method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004344900A (en) * | 2003-05-20 | 2004-12-09 | Nippon Steel Corp | Dipping nozzle and continuous casting method using the same |
| CN203459651U (en) * | 2013-08-13 | 2014-03-05 | 宝山钢铁股份有限公司 | Submersed nozzle with flow control vanes |
| CN204842961U (en) * | 2015-08-21 | 2015-12-09 | 安徽工业大学 | Get rid of immersion nozzle of inclusion |
-
2019
- 2019-09-30 CN CN201910939330.XA patent/CN110842186B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004344900A (en) * | 2003-05-20 | 2004-12-09 | Nippon Steel Corp | Dipping nozzle and continuous casting method using the same |
| CN203459651U (en) * | 2013-08-13 | 2014-03-05 | 宝山钢铁股份有限公司 | Submersed nozzle with flow control vanes |
| CN204842961U (en) * | 2015-08-21 | 2015-12-09 | 安徽工业大学 | Get rid of immersion nozzle of inclusion |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113042699A (en) * | 2021-03-16 | 2021-06-29 | 北部湾大学 | Method for judging air blowing slag entrapment of slab crystallizer |
| CN114799150A (en) * | 2022-04-24 | 2022-07-29 | 湖南华菱涟源钢铁有限公司 | Wave suppression method for continuous casting of square billets |
| CN114888270A (en) * | 2022-05-09 | 2022-08-12 | 湖南华菱涟源钢铁有限公司 | Slab continuous casting high-pulling-speed reverse inclined hole type wave suppression method |
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| CN110842186B (en) | 2022-02-18 |
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