A method of continuous casting tundish alloying

Abstract

The present application relates to steel smelting and metal material preparation technical field, provide a kind of method for alloying in continuous casting tundish, comprising the following steps: inert gas valve is opened, and the alloy channel of alloy adding device is filled with inert gas;Ladle opening, molten steel enters into tundish turbulent flow ware by long nozzle, and fills into tundish according to the set path;After the liquid level of molten steel in tundish rises to the set height, open tundish stopper, and molten steel flows into crystallizer through submerged entry nozzle and is cast;After casting starts, start the controller of alloy bin, and according to the set discharge flow, alloy in alloy bin is added to molten steel through alloy channel;According to the flow of casting molten steel, the discharge speed of alloy bin is adjusted.The present application can solve the problems such as low alloy yield during steelmaking and refining, small batch different component steel cannot be produced in scale, composition control is not accurate when alloying in continuous casting tundish, etc.

Description

Technical Field

[0001] This invention relates to the field of iron and steel smelting and metal material preparation technology, and more particularly to a method for alloying a continuous casting tundish. Background Technology

[0002] Alloying of molten steel is an important part of the steelmaking process. Traditional alloying is generally carried out in the converter and in the ladle. Because the temperature of the molten steel is high before and after refining, the oxygen content in the molten steel is relatively high, resulting in a large loss of alloying elements. In addition, each ladle of molten steel can only contain one composition, so the batch size is relatively large.

[0003] Currently, only some easily oxidized rare earth alloys are alloyed in the continuous casting tundish, and there are problems such as inaccurate composition control and low yield of alloys due to oxidation during the alloying process. Summary of the Invention

[0004] To address the aforementioned technical problems, a method for alloying in a continuous casting tundish is provided. This method solves the problems of low alloy yield during alloying in steelmaking and refining, the inability to mass-produce small batches of steels with different compositions, and inaccurate composition control during alloying in the continuous casting tundish. It is a method for achieving relatively stable alloying control.

[0005] The technical means employed in this invention are as follows: A method for alloying a continuous casting tundish includes the following steps: S1: Open the inert gas valve of the inert gas protection tube of the alloy adding device to fill the alloy channel of the alloy adding device with inert gas; S2: The molten steel ladle is opened for pouring. The molten steel enters the turbulence generator in the tundish through the long nozzle and fills the tundish according to the set path. S3: After the molten steel level in the tundish rises to the set height, the tundish stopper is opened, and the molten steel flows into the crystallizer through the submerged entry nozzle for casting. S4: After casting begins, start the controller of the alloy silo and add the alloy in the alloy silo to the molten steel through the alloy channel according to the set feeding flow rate. S5: Adjust the feeding speed of the alloy hopper according to the flow rate of the molten steel being poured.

[0006] Furthermore, in S5, the relationship between the feeding speed of the alloy hopper and the flow rate of the molten steel being poured is as follows: ; in, For the feeding speed of the alloy hopper , For the flow rate of molten steel being poured , Target alloy composition for molten steel , For the specified alloy yield .

[0007] Furthermore, the flow rate of the molten steel being cast The range is 1.5~5t / min, and the range of the specified alloy yield η is 0.4~1.0%.

[0008] Furthermore, in S3, the set height range is above 400mm.

[0009] Furthermore, in S4, the set feed flow rate ranges from 0.75 to 100 kg / min.

[0010] Furthermore, in S4, the particle size of the alloy is 0.5~5mm.

[0011] Furthermore, in S1, the inert gas is argon.

[0012] Furthermore, the molten steel is sequentially filled into the tundish through the long nozzle via the turbulence generator, slag dam, and slag weir, with a residence time of 1-2 seconds, to achieve homogenization.

[0013] Compared with the prior art, the present invention has the following advantages: The present invention provides a method for alloying a continuous casting tundish, which can improve alloy yield and reduce costs; at the same time, it achieves precise control and fine-tuning of composition; improves the purity of molten steel and the quality of cast billets; and optimizes the production process and flexibility. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is an overall flowchart of a method for alloying a continuous casting tundish according to the present invention; Figure 2 This is an overall structural diagram of the apparatus used in the continuous casting tundish alloying method of the present invention; Figure reference numerals: 1-Inert gas protection pipe; 2-Alloy channel; 3-Alloy silo; 4-Long nozzle; 5-Tundish turbulence generator; 6-Tundish; 7-Immersion nozzle; 8-Tundish stopper rod; 9-Path; 10-Slag weir; 11-Slag dam. Detailed Implementation

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0020] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0021] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0022] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0023] Example 1: The production of low-carbon aluminum-killed steel involves 96 tons of molten steel. The composition of the converter steel is as follows:

[0024] like Figure 1 and Figure 2 As shown, a method for alloying a continuous casting tundish includes the following steps: S0 (Preliminary step): Add silicon-manganese alloy to alloy hopper 3, with a particle size of 1~5mm; S1: Open the inert gas valve of the inert gas protection tube 1 of the alloy adding device to fill the alloy channel 2 of the alloy adding device with inert gas; S2: The molten steel ladle is opened for pouring. The molten steel enters the turbulence generator 5 of the tundish through the long nozzle 4 and fills the tundish 6 according to the set path 9. S3: After the molten steel level in the tundish 6 rises to the set height, the tundish stopper 8 is opened, and the molten steel flows into the crystallizer through the submerged entry nozzle 7 for casting. S4: After casting begins, start the controller of alloy silo 3 and add the alloy in alloy silo 3 to the molten steel through alloy channel 2 according to the set feeding flow rate. S5: Adjust the feeding speed of alloy silo 3 according to the flow rate of molten steel.

[0025] In this embodiment, in step S5, the relationship between the feeding speed of the alloy hopper 3 and the flow rate of the molten steel is as follows: ; in, The feeding speed of alloy hopper 3 , For the flow rate of molten steel being poured , Target alloy composition for molten steel , For the specified alloy yield .

[0026] In this embodiment, the flow rate of the cast steel The range is 1.5~5t / min, and the range of the specified alloy yield η is 0.4~1.0%.

[0027] In this embodiment, in S3, the set height range is above 400mm.

[0028] In this embodiment, in S4, the set feed flow rate ranges from 0.75 to 100 kg / min.

[0029] In this embodiment, in step S4, the particle size of the alloy is 0.5~5mm.

[0030] In this embodiment, in S1, the inert gas is argon.

[0031] In this embodiment, molten steel is sequentially filled into the tundish 6 through the long nozzle 4 via the turbulent flow device 5, the slag dam 11, and the slag weir 10. The molten steel residence time is 1-2 seconds, which achieves uniform mixing.

[0032] Example 2: The production of high-carbon steel involves 98 tons of molten steel. The composition of the converter steel is as follows:

[0033] like Figure 1 and Figure 2 As shown, a method for alloying a continuous casting tundish includes the following steps: S0 (preliminary step): Add high-carbon silicon-manganese alloy with a particle size of 1~5mm to alloy hopper 3; S1: Open the inert gas valve of the inert gas protection tube 1 of the alloy adding device to fill the alloy channel 2 of the alloy adding device with inert gas; S2: The molten steel ladle is opened for pouring. The molten steel enters the turbulence generator 5 of the tundish through the long nozzle 4 and fills the tundish 6 according to the set path 9. S3: After the molten steel level in the tundish 6 rises to the set height, the tundish stopper 8 is opened, and the molten steel flows into the crystallizer through the submerged entry nozzle 7 for casting. S4: After casting begins, start the controller of alloy silo 3 and add the alloy in alloy silo 3 to the molten steel through alloy channel 2 according to the set feeding flow rate. S5: Adjust the feeding speed of alloy silo 3 according to the flow rate of molten steel.

[0034] The rest is the same as in Example 1, and will not be described again here.

[0035] Example 3: The production of low-carbon aluminum killed steel involves 205 tons of molten steel. The composition of the converter steel is as follows:

[0036] like Figure 1 and Figure 2 As shown, a method for alloying a continuous casting tundish includes the following steps: S0 (preliminary step): Add carbon-silicon-manganese alloy with a particle size of 1~5mm to alloy hopper 3; S1: Open the inert gas valve of the inert gas protection tube 1 of the alloy adding device to fill the alloy channel 2 of the alloy adding device with inert gas; S2: The molten steel ladle is opened for pouring. The molten steel enters the turbulence generator 5 of the tundish through the long nozzle 4 and fills the tundish 6 according to the set path 9. S3: After the molten steel level in the tundish 6 rises to the set height, the tundish stopper 8 is opened, and the molten steel flows into the crystallizer through the submerged entry nozzle 7 for casting. S4: After casting begins, start the controller of alloy silo 3 and add the alloy in alloy silo 3 to the molten steel through alloy channel 2 according to the set feeding flow rate. S5: Adjust the feeding speed of alloy silo 3 according to the flow rate of molten steel.

[0037] The rest is the same as in Example 1, and will not be described again here.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for alloying a continuous casting tundish, characterized in that, Includes the following steps: S1: Open the inert gas valve of the inert gas protection tube (1) of the alloy adding device to fill the alloy channel (2) of the alloy adding device with inert gas; S2: The molten steel ladle is opened for pouring. The molten steel enters the turbulent flow device (5) of the tundish through the long nozzle (4) and fills the tundish (6) according to the set path (9); S3: After the molten steel level in the tundish (6) rises to the set height, the tundish stopper (8) is opened, and the molten steel flows into the crystallizer through the submerged entry nozzle (7) for casting. S4: After casting begins, start the controller of the alloy silo (3) and add the alloy in the alloy silo (3) to the molten steel through the alloy channel (2) according to the set feeding flow rate; S5: Adjust the feeding speed of the alloy silo (3) according to the flow rate of the molten steel.

2. The method for alloying a continuous casting tundish according to claim 1, characterized in that, In S5, the relationship between the feeding speed of the alloy hopper (3) and the flow rate of the molten steel is as follows: ； in, The feeding speed of the alloy hopper (3) , For the flow rate of molten steel being poured , For the specified alloy target composition in molten steel , For the specified alloy yield .

3. The method for alloying a continuous casting tundish according to claim 2, characterized in that, The flow rate of molten steel being cast The range is 1.5~5 t / min, and the range of the specified alloy yield η is 0.4~1.0%.

4. The method for alloying a continuous casting tundish according to claim 1, characterized in that, In S3, the set height range is above 400mm.

5. The method for alloying a continuous casting tundish according to claim 1, characterized in that, In S4, the set feed flow rate ranges from 0.75 to 100 kg / min.

6. The method for alloying a continuous casting tundish according to claim 1, characterized in that, In S4, the particle size of the alloy is 0.5~5mm.

7. The method for alloying a continuous casting tundish according to claim 1, characterized in that, In S1, the inert gas is argon.

8. The method for alloying a continuous casting tundish according to claim 1, characterized in that, Molten steel is fed into the tundish (6) through the long nozzle (4) in sequence via the tundish turbulence generator (5), the slag dam (11) and the slag weir (10). The molten steel stays for 1~2 seconds to achieve uniform mixing.

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