CN114317896A - Method for improving castability of molten steel - Google Patents
Method for improving castability of molten steel Download PDFInfo
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- CN114317896A CN114317896A CN202210017398.4A CN202210017398A CN114317896A CN 114317896 A CN114317896 A CN 114317896A CN 202210017398 A CN202210017398 A CN 202210017398A CN 114317896 A CN114317896 A CN 114317896A
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Abstract
The invention relates to the technical field of steel making in metallurgical industry, in particular to a method for improving castability of molten steel. The method comprises the following steps: an RH alloying treatment process, wherein an alloy is added into molten steel to be alloyed in a steel ladle through a vacuum feeding system to obtain alloyed molten steel reaching preset conditions, wherein the preset conditions reached by the alloyed molten steel comprise that the oxygen content of the molten steel is less than 10ppm and the sulfur content of the molten steel is less than or equal to 0.02%; RH calcium treatment process, feeding calcium wire into the alloying molten steel in the ladle through a wire feeder to obtain molten steel after calcium treatment; and a casting procedure, namely transferring the molten steel after calcium treatment to a crystallizer through a tundish, and adjusting the calcium feeding line amount of the molten steel of the next furnace in the RH calcium treatment procedure according to the castability of the molten steel of the previous furnace in the tundish. The following beneficial effects are: the castability of molten steel is improved, the smooth production is ensured, and the product quality and the production efficiency are ensured.
Description
Technical Field
The invention relates to the technical field of steel making in metallurgical industry, in particular to a method for improving castability of molten steel.
Background
In the metallurgical steelmaking industry, the castability of molten steel has a vital influence on the quality of produced products and production efficiency, but in the actual production process, the improvement of the castability of the molten steel is very difficult, and the castability of the molten steel is often abnormal. Therefore, improvement of the castability of molten steel is a problem to be solved urgently.
Disclosure of Invention
In view of the above-mentioned disadvantages of the prior art, an object of the present invention is to provide a method for improving the castability of molten steel, which is used to solve the problem of poor castability of molten steel in the prior art.
To achieve the above and other related objects, the present invention provides a method for improving castability of molten steel, comprising the steps of:
an RH alloying treatment process, wherein an alloy is added into molten steel to be alloyed in a steel ladle through a vacuum feeding system to obtain alloyed molten steel reaching preset conditions, wherein the preset conditions reached by the alloyed molten steel comprise that the oxygen content of the molten steel is less than 10ppm and the sulfur content of the molten steel is less than or equal to 0.02%;
RH calcium treatment process, feeding calcium wire into the alloying molten steel in the ladle through a wire feeder to obtain molten steel after calcium treatment;
and a casting procedure, namely transferring the molten steel after calcium treatment to a crystallizer through a tundish, and adjusting the calcium feeding line amount of the molten steel of the next furnace in the RH calcium treatment procedure according to the castability of the molten steel of the previous furnace in the tundish.
Optionally, in the RH alloying treatment process, before adding the alloy to the molten steel to be alloyed in the ladle, the gas loop flow rate in the vacuum tank in the vacuum charging system is adjusted to a first preset loop flow rate and maintained, and after adding the alloy to the vacuum tank and circulating the alloy in the vacuum tank for a first preset time, the gas loop flow rate in the vacuum tank is adjusted to a second preset loop flow rate.
Optionally, the adjusting the gas annular flow in the vacuum tank in the vacuum charging system to the first preset annular flow and maintaining the same, adding the alloy into the vacuum tank and circulating the same in the vacuum tank for the first preset time, and then adjusting the gas annular flow in the vacuum tank to the second preset annular flow comprises,
introducing argon into the vacuum tank until the gas circulation flow in the vacuum tank reaches 110-130 m3H, maintaining, adding alloy into the vacuum tank, circulating for 3min, and regulating gas circulation flow to 90m3/h。
Optionally, in the RH calcium treatment process, before the calcium line is fed, argon is blown to the inner bottom of the ladle through a vacuum feeding system, wherein the argon is blown at a flow rate of less than 60Nm3Introducing the argon gas until the calcium line feeding is finished, and adjusting the flow of the argon gas to be less than or equal to 20m3The introduction is continued for at least 5 min.
Optionally, when the calcium wire is fed, the argon bottom-blowing gas flow is in a descending area and the calcium wire feeding position is deviated from the ladle bottom-blowing point position.
Optionally, in the process of feeding the calcium wire, the feeding speed of the calcium wire is 120-150 m/min, and the temperature drop range of the molten steel is 5-8 ℃.
Optionally, in the RH calcium treatment process, the feeding amount of a calcium wire fed into the alloying molten steel in the ladle is 180-230 m.
Optionally, in the casting process, in the process of transferring the molten steel of the previous furnace to the crystallizer by the tundish, when the opening degree of the stopper rod on the tundish is higher than the initial opening degree and the variation of the opening degree of the stopper rod is more than 10, the calcium feeding line amount of the molten steel of the next furnace in the RH calcium treatment process is adjusted to 230-280 m.
Optionally, in the casting process, in the process of transferring the molten steel of the previous furnace to the crystallizer by the tundish, when the opening degree of the stopper rod on the tundish is lower than the initial opening degree and the variation of the opening degree of the stopper rod is greater than 5, the calcium feeding line amount of the molten steel of the next furnace in the RH calcium treatment process is adjusted to 130-180 m.
Optionally, before the RH calcium treatment process, the alloyed molten steel is sampled and analyzed, and when the acid-soluble aluminum content in the alloyed molten steel is greater than 0.05%, the feeding amount of the calcium wire to the alloyed molten steel in the ladle in the RH calcium treatment process is 230 m.
As described above, the method for improving the castability of molten steel according to the present invention has at least the following advantageous effects: the castability of molten steel is improved, the smooth production is ensured, and the product quality and the production efficiency are ensured.
Drawings
FIG. 1 is a schematic view showing a structure of a vacuum charging system according to an embodiment of the method for improving castability of molten steel of the present invention.
Description of reference numerals
1-steel ladle; 21-vacuum groove upper part; 22-vacuum groove lower part; 3-an argon inlet; 4-an exhaust port; 5-an alloy material feeding port; 6-dip tube.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated. The structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are for understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined in the claims, and are not essential to the art, and any structural modifications, changes in proportions, or adjustments in size, which do not affect the efficacy and attainment of the same are intended to fall within the scope of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Before describing embodiments of the present invention in detail, the present invention will be described in an application environment. The technology of the invention is mainly applied to the field of steelmaking, in particular to the field of improving the castability of molten steel. The invention solves the problems of poor molten steel castability, abnormal production process, low production efficiency and the like in the traditional steelmaking process.
Referring to FIG. 1, in one embodiment, the present application provides a method of improving castability of molten steel, comprising the steps of: an RH alloying treatment process, wherein an alloy is added into the molten steel to be alloyed in the steel ladle 1 through a vacuum feeding system to obtain alloyed molten steel reaching preset conditions, wherein the preset conditions reached by the alloyed molten steel comprise that the oxygen content of the molten steel is less than 10ppm and the sulfur content of the molten steel is less than or equal to 0.02%; RH calcium treatment process, feeding calcium wire into the alloying molten steel in the ladle 1 through a wire feeder to obtain molten steel after calcium treatment; and a casting procedure, namely transferring the molten steel after calcium treatment to a crystallizer through a tundish, and adjusting the calcium feeding line amount of the molten steel of the next furnace in the RH calcium treatment procedure according to the castability of the molten steel of the previous furnace in the tundish.
The method for improving the castability of the molten steel improves the castability of the molten steel, and timely adjusts the calcium feeding line amount of the molten steel of the next heat according to the castability of the molten steel in the casting process, thereby ensuring the production quality and avoiding the waste of resources.
Referring to fig. 1, in an embodiment, in the RH alloying process, before adding an alloy to molten steel to be alloyed in a ladle 1, a gas circulation rate in a vacuum tank in a vacuum charging system is adjusted to a first preset circulation rate and maintained, and after adding an alloy to the vacuum tank and circulating the alloy in the vacuum tank for a first preset time, the gas circulation rate in the vacuum tank is adjusted to a second preset circulation rate. Optionally, firstly introducing argon into the vacuum tank until the gas circulation flow in the vacuum tank reaches 110-130 m3The flow rate is maintained, i.e. the first preset circulation flow rate can be 110-130 m3H; adding alloy into the vacuum tank, and circulating in the vacuum tank for 3minThen adjusting the gas ring flow in the vacuum groove to 90m3H, i.e. the first predetermined time may be greater than or equal to 3min, and the second predetermined circulation rate may be 90m3H is used as the reference value. Optionally, the vacuum tank comprises an upper vacuum tank part 21 and a lower vacuum tank part 22, the immersion pipe 6 is positioned below the vacuum tank, and argon can be introduced from an argon inlet 3 of the vacuum charging system and enter the vacuum tank to form a vacuum environment, so that the vacuum charging system forms a vacuum environment before alloy addition and is ready for alloy addition. Through the RH alloying treatment process, after the molten steel is subjected to alloying treatment, the oxygen content in the molten steel is less than 10ppm, and the sulfur content in the molten steel is less than or equal to 0.02 percent, so that the method is accurate for the subsequent calcium treatment of the molten steel, and ensures that the molten steel can reach the calcium treatment condition.
Referring to fig. 1, in one embodiment, in the RH calcium treatment process, argon is blown into the inner bottom of the ladle 1 through a vacuum charging system at a flow rate of less than 60Nm before the calcium wire is fed3Introducing the argon gas until the calcium line feeding is finished, and adjusting the flow of the argon gas to be less than or equal to 20m3The introduction is continued for at least 5 min. Further, argon can be introduced from an argon inlet 3 of the vacuum charging system, and the flow of the argon can be 5-15 Nm3And h, introducing until the calcium line feeding is finished. Furthermore, when the calcium wire is fed, the bottom argon blowing gas flow is in a descending area, the feeding position of the calcium wire is deviated from the bottom blowing point position of the steel ladle, namely the feeding position of the calcium wire is deviated from the position where argon enters the steel ladle 1, and the calcium wire is prevented from being influenced by the argon to influence the treatment effect. Furthermore, in the process of feeding the calcium wire, the feeding speed of the calcium wire can be 120-150 m/min, and the temperature drop range of the molten steel can be 5-8 ℃. Further, in the RH calcium treatment process, the feeding amount of the calcium wire to the alloyed molten steel in the ladle 1 may be 180 to 230m, for example, any one of 180m, 200m, and 230 m.
Referring to fig. 1, in an embodiment, in a casting process, molten steel in a ladle 1 is transferred through a tundish, and when the opening degree of a stopper rod on the tundish is higher than an initial opening degree and the variation of the opening degree of the stopper rod is greater than 10 during the transfer of molten steel of a previous furnace to a crystallizer, the calcium feeding linear quantity of the molten steel of the next furnace in an RH calcium treatment process is adjusted to 230-280 m, which may be any one of 240m, 265m and 280m, for example. Optionally, the opening degree of the stopper rod on the tundish is higher than the initial opening degree and can be used as one of the criteria for judging whether the tundish nozzle is blocked, and further, the blockage level of the tundish nozzle can be judged in an auxiliary manner by observing the state of the tundish nozzle, the state of the liquid level of the crystallizer and the state of the steel pouring handle, so that the judgment accuracy is improved, and the judgment difficulty is reduced. Specifically, the level of clogging of the tundish nozzle can be judged by table 1, and when the level of clogging is greater than or equal to three levels, the metallic calcium wire feed amount of the latter molten steel is adjusted to 230m to 280m, and the nozzle is replaced or the casting is stopped.
TABLE 1
Referring to fig. 1, in an embodiment, in a casting process, molten steel in a ladle 1 is transferred through a tundish, and when an opening degree of a stopper on the tundish is lower than an initial opening degree and a variation of the opening degree of the stopper is greater than 5 during the transfer of molten steel of a previous furnace to a mold, a calcium feeding line amount of molten steel of the next furnace in an RH calcium treatment process is adjusted to 130 to 180m, which may be any one of 130m, 145m, or 170m, for example. Optionally, the opening degree of the stopper rod on the tundish is lower than the initial opening degree to serve as a criterion for judging whether a water washing hole phenomenon (the water washing hole phenomenon refers to a phenomenon that in the casting process, when the opening degree of the stopper rod is lower than the initial opening degree, the steel pouring handle is in an upward lifting trend, and the size of a side hole or an inner hole of the submerged nozzle is increased, the head of the stopper rod is seriously corroded, the corrosion of a refractory material of the tundish is serious, and the like) occurs, so that the judgment difficulty is reduced, and the production process is adjusted in time. Specifically, the level of the water washing port phenomenon of the tundish water port can be judged by table 2, and when the level is greater than or equal to the second level, the feeding amount of the calcium metal wire of the next heat is adjusted to 130 m-180 m.
TABLE 2
| Rank of | Stopper rod opening degree variation X2 (lower than initial opening degree) |
| |
2＜X2≤5 |
| Stage 2 | 5＜X2≤10 |
| |
X2＞10 |
Referring to fig. 1, in one embodiment, before the RH calcium treatment process, the alloyed molten steel is sampled and analyzed, and when the content of acid-soluble aluminum in the alloyed molten steel is greater than 0.05%, the feeding amount of a calcium wire to the alloyed molten steel in a ladle in the RH calcium treatment process may be 230 m.
In one embodiment, the method for improving the castability of molten steel comprises an LF process and an RH process, wherein the RH process comprises an RH alloying process, an RH calcium treatment process and a casting process, wherein a metallic calcium wire can be fed in the LF process or the RH calcium treatment process, and the amount of the metallic calcium wire fed in the LF process or the RH calcium treatment process can be 230 m/furnace when smelting the first furnace and the second furnace. Alternatively, when abnormal stop of continuous casting pouring occurs in the casting process after the LF process and the RH process, the quantity of the metal calcium wires fed for the next furnace can be increased by 50 m/furnace. Optionally, in the heat with short treatment time in the LF process and the RH process, the calcium line feeding amount of the current heat can be increased, specifically, when the treatment time in the LF process is less than or equal to 35min, the calcium line feeding amount in the LF process is increased to 250 m/furnace, and when the treatment time in the RH vacuum is less than or equal to 15min, the calcium line feeding amount in the RH process is increased to 230 m/furnace. Alternatively, the RH procedure calcium feed line was increased to 280 m/furnace when in the RHOB warming heat of the RH procedure.
The method for improving the castability of the molten steel obviously improves the castability of the molten steel, reduces the abnormal conditions of the castability of the molten steel, and particularly refers to table 3 for comparison, the table 3 shows that the proportion of the abnormal heat of the castability of the molten steel is greatly reduced, and the production quality and the production efficiency are ensured.
TABLE 3
| Item | Number of production furnaces | Abnormal number of furnaces | Abnormal ratio |
| Before improvement | 9370 | 462 | 4.93％ |
| After improvement | 9370 | 90 | 0.96％ |
The method for improving the castability of the molten steel has the advantages of simple steps, convenient operation, reduction of production difficulty, improvement of the castability of the molten steel, quality qualification guarantee and smooth production guarantee.
In the description of the present specification, reference to the description of the terms "present embodiment," "example," "specific example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A method for improving castability of molten steel is characterized by comprising the following steps:
an RH alloying treatment process, wherein an alloy is added into molten steel to be alloyed in a steel ladle through a vacuum feeding system to obtain alloyed molten steel reaching preset conditions, wherein the preset conditions reached by the alloyed molten steel comprise that the oxygen content of the molten steel is less than 10ppm and the sulfur content of the molten steel is less than or equal to 0.02%;
RH calcium treatment process, feeding calcium wire into the alloying molten steel in the ladle through a wire feeder to obtain molten steel after calcium treatment;
and a casting procedure, namely transferring the molten steel after calcium treatment to a crystallizer through a tundish, and adjusting the calcium feeding line amount of the molten steel of the next furnace in the RH calcium treatment procedure according to the castability of the molten steel of the previous furnace in the tundish.
2. The method for improving the castability of molten steel according to claim 1, wherein: in the RH alloying treatment process, before adding the alloy into the molten steel to be alloyed in the ladle, the gas loop flow in a vacuum groove in a vacuum feeding system is adjusted to a first preset loop flow and maintained, the alloy is added into the vacuum groove and is circulated in the vacuum groove for a first preset time, and then the gas loop flow in the vacuum groove is adjusted to a second preset loop flow.
3. The method for improving the castability of molten steel according to claim 2, wherein: the method comprises the steps of firstly adjusting the gas annular flow in a vacuum groove in a vacuum charging system to a first preset annular flow and keeping the gas annular flow, adding alloy into the vacuum groove and circulating the alloy in the vacuum groove for a first preset time, then adjusting the gas annular flow in the vacuum groove to a second preset annular flow,
introducing argon into the vacuum tank until the gas circulation flow in the vacuum tank reaches 110-130 m3H, maintaining, adding alloy into the vacuum tank, circulating for 3min, and regulating gas circulation flow to 90m3/h。
4. The method for improving the castability of molten steel according to claim 1, wherein: in the RH calcium treatment process, before a calcium line is fed, argon is blown to the inner bottom of the ladle through a vacuum feeding system, wherein the flow rate of the argon is less than 60Nm3Introducing the argon gas until the calcium line feeding is finished, and adjusting the flow of the argon gas to be less than or equal to 20m3The introduction is continued for at least 5 min.
5. The method for improving the castability of molten steel of claim 4, wherein: when the calcium line is fed, the bottom argon blowing gas flow is in a descending area, and the feeding position of the calcium line deviates from the position of the bottom blowing point of the ladle.
6. The method for improving the castability of molten steel according to claim 1, wherein: in the process of feeding the calcium wire, the feeding speed of the calcium wire is 120-150 m/min, and the temperature drop range of the molten steel is 5-8 ℃.
7. The method for improving the castability of molten steel according to claim 1, wherein: in the RH calcium treatment process, the feeding amount of a calcium wire is 180-230 m when the alloying molten steel in the ladle is fed.
8. The method for improving castability of molten steel of claim 7, wherein: in the casting process, in the process of transferring the molten steel of the previous furnace to the crystallizer by the tundish, when the opening degree of the stopper rod on the tundish is higher than the initial opening degree and the change of the opening degree of the stopper rod is more than 10, the calcium feeding linear quantity of the molten steel of the next furnace in the RH calcium treatment process is adjusted to 230-280 m.
9. The method for improving castability of molten steel of claim 7, wherein: in the casting process, in the process of transferring the molten steel of the previous furnace to the crystallizer by the tundish, when the opening degree of the stopper rod on the tundish is lower than the initial opening degree and the change of the opening degree of the stopper rod is more than 5, the calcium feeding linear quantity of the molten steel of the next furnace in the RH calcium treatment process is adjusted to 130-180 m.
10. The method for improving the castability of molten steel according to claim 1, wherein: before the RH calcium treatment process, the alloyed molten steel is sampled and analyzed, and when the content of acid-soluble aluminum in the alloyed molten steel is more than 0.05%, the feeding amount of a calcium wire is fed into the alloyed molten steel in a ladle in the RH calcium treatment process to be 230 m.
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