CN206677173U - Rare earth steel and the mouth of a river used for aluminum-containing steel and middle steel ladle - Google Patents
Rare earth steel and the mouth of a river used for aluminum-containing steel and middle steel ladle Download PDFInfo
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- CN206677173U CN206677173U CN201720433175.0U CN201720433175U CN206677173U CN 206677173 U CN206677173 U CN 206677173U CN 201720433175 U CN201720433175 U CN 201720433175U CN 206677173 U CN206677173 U CN 206677173U
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- steel
- nozzle
- rare earth
- pipe end
- filling pipe
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 110
- 239000010959 steel Substances 0.000 title claims abstract description 110
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 45
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 45
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 34
- 238000005266 casting Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 43
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000008520 organization Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000009749 continuous casting Methods 0.000 description 21
- 238000000034 method Methods 0.000 description 9
- 230000024121 nodulation Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 239000005350 fused silica glass Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The utility model discloses a kind of rare earth steel and the mouth of a river used for aluminum-containing steel, and it includes filling pipe end, collector nozzle, and the slide plate being arranged between filling pipe end and collector nozzle；Filling pipe end bottom is equal with the inside radius of collector nozzle the top；The internal structure of filling pipe end includes upper and bottom section, and the aditus laryngis of filling pipe end forms upper part with upper bit；The bottom of aditus laryngis extends still further below after vertically making an angle alpha extension obliquely upward, forms lower part；Filling pipe end bottom inside radius is bigger distance d than inside radius at filling pipe end aditus laryngis.Extend still further below after vertically making an angle alpha extension obliquely upward due to filling pipe end aditus laryngis bottom, therefore molten steel can not possibly flow to filling pipe end bottom through aditus laryngis along filling pipe end top wall and continue to flow down.The mouth of a river can realize sequence casting, not block the mouth of a river.Further, since rare earth steel and Aluminum steel do not block the mouth of a river, permanent pulling rate cast production is realized, this quality to steel is highly beneficial, and very big benefit is also brought to organization of production.
Description
Technical Field
The utility model relates to a metallurgical industry production technical field especially relates to a tombarthite steel and contain aluminium steel water gap and middle steel ladle.
Background
Several studies have shown that: rare earths are advantageous for improving the properties of steel. The rare earth can reduce the grain size of steel, improve the toughness and low-temperature impact property of the steel, improve the lamellar tearing resistance in the thickness direction of a plate blank and the like. However, because of the core problem that the continuous production of steel making is hindered by the blockage of a continuous casting nozzle in the production process of rare earth steel, the development and the utilization of the rare earth steel are greatly limited and are almost in a standstill state at present.
The aluminum-containing steel is also a common steel grade, but because the aluminum-containing steel also easily blocks a continuous casting nozzle, the normal production of continuous casting is influenced, small casting secondary production (the number of continuous casting furnaces is small) is forced to be adopted, and the steel-making cost is increased.
According to the introduction of the patent of rare earth steel pouring (patent application No. CN86200556U) applied by the third Shanghai Steel works, ZhaoGehen et al, the utility model provides a composite nozzle for steel smelting capable of preventing nozzle from nodulation, which is characterized in that the inner wall of the nozzle is provided with a SiO solid with a concentration of more than 95%2Fused silica is a liner of material. In the process of pouring the rare earth steel, the properties of the nozzle nodules are changed due to the change of the material of the nozzle refractory material, and the interface energy between the rare earth inclusions and the nozzle inner wall material is improved, so that stagnation of the rare earth inclusions is avoided, and the nodules are prevented.
But due to the SiO in the nozzle2Is easily washed away by molten steel and enters the molten steel to form inclusions, and is not widely used.
According to the introduction of the patent 'continuous casting tundish rare earth wire feeding process' (patent application number 01127004.7) applied by Zhaxuedai, Nanjing university of Engineers, and the like, the patent adopts a method of tundish rare earth wire feeding to avoid the rare earth steel from blocking a water gap, but the method is not widely adopted because the rare earth content in the molten steel is not uniform and affects the normal production of continuous casting.
The patent of 'continuous casting tundish rare earth adding process' (patent application number 200510053297.9) applied by any newly-built person of Baotou iron and Steel company is also introduced, and the patent also adopts the process of tundish feeding rare earth, and the patent also has the problem of uneven rare earth content.
"a novel patent for preventing Al" applied by Zuochang, etc. of Laiwu Steel works Limited2O3Continuous casting tundish equipment (patent application No. 200820016118.3) attached to a water gap wall is introduced, wherein the tundish equipment is a stopper rod which can rotate by 0-10 degrees, an inner cavity of an upper water gap is of an inverted horn-shaped structure, and the roughness of the inner wall of the inner cavity of the upper water gap is required to be 0-10 microns.
However, the molten steel easily flows to the lower half part of the upper nozzle along the wall of the upper nozzle (in the tundish) through the throat, so that the risk of blockage is increased; and the patent does not describe the case of the drain.
In actual production, the lower nozzle is blocked because of contacting with air, the temperature is reduced more (especially in winter), the lower nozzle is easy to block, and the replacement of the lower nozzle after the lower nozzle is blocked brings inconvenience to steel-making production. Therefore, in order to prevent the nozzle from being blocked, the lower nozzle is firstly not in direct contact with the molten steel, and then the upper nozzle is changed correspondingly, so that the molten steel does not flow down along the wall of the upper nozzle.
In addition, the smoother the inner wall of the nozzle is better, but the nozzle is difficult to realize in actual production due to the fact that the refractory nozzle per se requires a certain porosity to improve the thermal shock stability of the nozzle.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a water gap for rare earth steel and aluminum-containing steel.
The utility model provides a water gap for rare earth steel and aluminum-containing steel, which comprises an upper water gap, a lower water gap and a sliding plate arranged between the upper water gap and the lower water gap;
the inner radius of the lowest end of the upper water gap is equal to that of the highest end of the lower water gap;
the inner structure of the upper nozzle comprises an upper part and a lower part, and the upper part is formed above the throat of the upper nozzle; the bottom end of the throat extends obliquely upwards along the vertical direction at an included angle alpha and then extends downwards to form a lower part, and alpha is more than 90 degrees and less than 180 degrees;
the inner radius of the lowest end of the upper nozzle is larger than the inner radius of the throat of the upper nozzle by a distance d, and d is more than or equal to 10mm and less than or equal to 25 mm.
Further, the nozzle is suitable for steel grades with 0-10% of rare earth content in cast steel and steel grades with 0-25% of aluminum content in steel.
Furthermore, the water gap is suitable for pouring small square billets, large square billets, round billets, special-shaped billets and slab sections.
The utility model also provides a middle steel ladle, wherein the bottom of the middle ladle is provided with any one of the above rare earth steel and the water gap for the aluminum-containing steel.
Compared with the prior art, the utility model, have following advantage:
because the bottom end of the throat of the upper nozzle extends obliquely upwards at an included angle alpha along the vertical direction and then extends downwards, the molten steel cannot flow to the lower part of the upper nozzle through the throat along the wall surface of the upper part of the upper nozzle and continuously flows downwards. The nozzle can be used for pouring rare earth steel and aluminum-containing steel, and can realize multi-furnace continuous pouring without blocking the nozzle. In addition, the rare earth steel and the aluminum-containing steel do not block a water gap, so that constant-pulling-speed pouring production is realized, the method is very favorable for the quality of steel products, and great benefits are brought to production organization.
Drawings
Fig. 1 is the structure of the water gap for rare earth steel and aluminum-containing steel provided by the embodiment of the utility model.
Description of reference numerals:
1-stopper rod
21-tundish working layer
22-permanent layer of tundish
2-tundish
3-brick cup
4-water supply port
5-skateboard
6-sewer outlet
7-molten Steel
Detailed Description
In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description.
In a specific implementation mode, the utility model provides a water gap for rare earth steel and aluminum-containing steel, please refer to fig. 1, this figure shows the structure of the water gap for rare earth steel and aluminum-containing steel that the embodiment of the utility model provides.
The water port for rare earth steel and aluminum-containing steel provided by the embodiment comprises an upper water port 4, a lower water port 6 and a sliding plate 5 arranged between the upper water port 4 and the lower water port 6; wherein,
the lowest end of the upper water gap 4 and the highest end of the lower water gap 6 have the same inner radius;
the inner structure of the upper nozzle 4 comprises an upper part and a lower part, and the upper part is formed above the throat of the upper nozzle 4; the bottom end of the throat extends obliquely upwards along the vertical direction at an included angle alpha and then extends downwards to form a lower part, and alpha is more than 90 degrees and less than 180 degrees;
the inner radius of the lowest end of the upper nozzle 4 is larger than the inner radius of the throat of the upper nozzle 4 by a distance d, and d is more than or equal to 10mm and less than or equal to 25 mm.
Further, the nozzle is suitable for steel grades with 0-10% of rare earth content in cast steel and steel grades with 0-25% of aluminum content in steel.
Preferably, the water gap is suitable for casting of small square billets, large square billets, round billets, special-shaped billets and slab sections.
The connection mode of the sliding plate 5, the upper nozzle 4 and the lower nozzle 6 can be the same as that of the prior art, and the description of the application is omitted.
During operation, molten steel is poured from the tundish, the rare earth content in the steel is 0-10%, the aluminum content in the steel is 0-25%, the angle formed by the lower end face of the throat of the upper nozzle and the vertical direction is alpha, the inner radius of the lowest end of the upper nozzle is larger than the inner radius of the throat of the upper nozzle by a distance d, and the molten steel does not directly contact with the inner wall of the lower part of the upper nozzle and the inner wall of the lower nozzle to enter a certain continuous casting crystallizer, so that the occurrence of nodulation is effectively prevented, and the nodulation does not occur at the nozzle above 20 furnaces of continuous casting.
Compared with the prior art, the utility model, have following advantage:
because the bottom end of the throat of the upper nozzle extends obliquely upwards at an included angle alpha along the vertical direction and then extends downwards, the molten steel cannot flow to the lower part of the upper nozzle through the throat along the wall surface of the upper part of the upper nozzle and continuously flows downwards. The nozzle can be used for pouring rare earth steel and aluminum-containing steel, and can realize multi-furnace continuous pouring without blocking the nozzle. In addition, the rare earth steel and the aluminum-containing steel do not block a water gap, so that constant-pulling-speed pouring production is realized, the method is very favorable for the quality of steel products, and great benefits are brought to production organization.
The utility model also provides a middle ladle, please refer to fig. 1, wherein the bottom of the middle ladle 2 is provided with the openings for rare earth steel and aluminum-containing steel according to the above embodiments. It can be understood in the art that the tundish may further include a stopper rod 1, a tundish working layer 21, a tundish permanent layer 22, a brick cup 3, etc., and the specific structures and arrangement positions of the above components may be the same as those in the prior art, which is not described in detail herein. Molten steel 7 is set in the tundish 2.
Because the utility model provides an intermediate ladle is provided with above-mentioned mouth of a river, therefore its corresponding utensil can realize that the multi-furnace is watered in succession, does not block up the mouth of a river, advantage that steel is of high quality.
The following describes the water gap for the steel ladle, the rare earth steel and the aluminum-containing steel provided by the utility model with reference to the specific embodiment:
example 1
(1) ML08A1 molten steel is poured from the tundish;
(2) the rare earth content in the steel is 0.08 percent, the aluminum content in the steel is 0.05 percent,
(3) the included angle between the bottom end of the throat of the water feeding port and the vertical direction is 102 degrees; the inner radius of the lowest end of the upper nozzle is larger than the inner radius of the throat of the upper nozzle (the position with the smallest radius of the upper nozzle) by a distance d, and d is 13 mm.
(4) The molten steel enters the billet continuous casting crystallizer without directly contacting with the inner wall of the lower part of the upper nozzle and the inner wall of the lower nozzle.
(5) The nozzle above the continuous casting 21 furnace does not form a nodule.
Example 2
(1) Pouring 50W600 molten steel from a tundish;
(2) the rare earth content in the steel is 0.2 percent, the aluminum content in the steel is 0.3 percent,
(3) the included angle between the bottom end of the throat of the water feeding port and the vertical direction is 107 degrees; the inner radius of the lowest end of the upper nozzle is larger than that of the throat of the upper nozzle (the position with the smallest radius of the upper nozzle) by a distance d, and d is 15 mm.
(4) The molten steel enters the slab continuous casting crystallizer without directly contacting with the inner wall of the lower part of the upper nozzle and the inner wall of the lower nozzle.
(5) The nozzle above the continuous casting furnace 23 is not nodulated.
Example 3
(1) Pouring Q355NH molten steel from a tundish;
(2) the rare earth content in the steel is 0.11 percent, the aluminum content in the steel is 0.03 percent,
(3) the included angle between the bottom end of the throat of the water feeding port and the vertical direction is 109 degrees; the inner radius of the lowest end of the upper nozzle is larger than the inner radius of the throat of the upper nozzle (the position with the smallest radius of the upper nozzle) by a distance d, and d is 16 mm.
(4) The molten steel enters the beam blank continuous casting crystallizer without directly contacting with the inner wall of the lower part of the upper nozzle and the inner wall of the lower nozzle.
(5) The nozzle above 25 furnaces for continuous casting and continuous casting is free from nodulation.
Example 4
(1) Pouring 20G molten steel from the tundish;
(2) the rare earth content in the steel is 0.09 percent, the aluminum content in the steel is 0 percent,
(3) the included angle between the bottom end of the throat of the water feeding port and the vertical direction is 113 degrees; the inner radius of the lowest end of the upper nozzle is larger than the inner radius of the throat of the upper nozzle (the position with the smallest radius of the upper nozzle) by a distance d, and d is 19 mm.
(4) The molten steel enters the round billet continuous casting crystallizer without directly contacting with the inner wall of the lower part of the upper nozzle and the inner wall of the lower nozzle.
(5) The nozzle above the continuous casting furnace 23 is not nodulated.
Example 5
(1) Pouring the U71Mn molten steel from the tundish;
(2) the rare earth content in the steel is 0.07 percent, the aluminum content in the steel is 0 percent,
(3) the included angle between the bottom end of the throat of the water feeding port and the vertical direction is 132 degrees; the inner radius of the lowest end of the upper nozzle is larger than that of the throat of the upper nozzle (the position with the smallest radius of the upper nozzle) by a distance d, and d is 23 mm.
(4) The molten steel enters the bloom continuous casting crystallizer without directly contacting with the inner wall of the lower part of the upper nozzle and the inner wall of the lower nozzle.
(5) The nozzle above the continuous casting 21 furnace does not form a nodule.
The rare earth steel, the water gap for the aluminum-containing steel and the middle steel ladle provided by the utility model are described in detail. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (4)
1. A water gap for rare earth steel and aluminum-containing steel is characterized by comprising an upper water gap, a lower water gap and a sliding plate arranged between the upper water gap and the lower water gap;
the inner radius of the lowest end of the upper water gap is equal to that of the highest end of the lower water gap;
the inner structure of the upper nozzle comprises an upper part and a lower part, and the upper part is formed above the throat of the upper nozzle; the bottom end of the throat extends obliquely upwards along the vertical direction at an included angle alpha and then extends downwards to form a lower part, and alpha is more than 90 degrees and less than 180 degrees;
the inner radius of the lowest end of the upper nozzle is larger than the inner radius of the throat of the upper nozzle by a distance d, and d is more than or equal to 10mm and less than or equal to 25 mm.
2. The nozzle for rare earth steel and aluminum-containing steel according to claim 1, wherein the nozzle is suitable for casting steel grades containing 0-10% of rare earth and 0-25% of aluminum.
3. The nozzle for rare earth and aluminum-containing steels according to claim 1, wherein the nozzle is suitable for casting of billets, blooms, round billets, beam billets and slab sections.
4. An intermediate ladle characterized in that the bottom of the intermediate ladle is provided with a tap for the rare earth steel and the aluminum-containing steel according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720433175.0U CN206677173U (en) | 2017-04-24 | 2017-04-24 | Rare earth steel and the mouth of a river used for aluminum-containing steel and middle steel ladle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720433175.0U CN206677173U (en) | 2017-04-24 | 2017-04-24 | Rare earth steel and the mouth of a river used for aluminum-containing steel and middle steel ladle |
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|---|---|
| CN206677173U true CN206677173U (en) | 2017-11-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111906266A (en) * | 2020-08-21 | 2020-11-10 | 北京科技大学 | Method for inhibiting rare earth molten steel pouring nozzle from being blocked by pulse current |
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2017
- 2017-04-24 CN CN201720433175.0U patent/CN206677173U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111906266A (en) * | 2020-08-21 | 2020-11-10 | 北京科技大学 | Method for inhibiting rare earth molten steel pouring nozzle from being blocked by pulse current |
| CN111906266B (en) * | 2020-08-21 | 2021-11-30 | 北京科技大学 | Method for inhibiting rare earth molten steel pouring nozzle from being blocked by pulse current |
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