CN111041153A - Method and system for smelting high-nitrogen tin plate molten steel - Google Patents
Method and system for smelting high-nitrogen tin plate molten steel Download PDFInfo
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Abstract
The invention discloses a method and a system for smelting high-nitrogen tin plate molten steel, which are used for controlling a ladle bottom blowing furnace; measuring the nitrogen content of the molten steel in the ladle bottom blowing furnace to obtain a first nitrogen content; obtaining bottom-blown nitrogen time t based on the target nitrogen content, the first nitrogen content and the nitrogen blowing rate of the ladle bottom-blown furnace; and controlling the ladle bottom-blowing furnace to be switched into bottom-blowing nitrogen, and continuously blowing nitrogen to the molten steel for t time according to the nitrogen blowing rate and the nitrogen blowing pressure to obtain first target molten steel. The invention establishes a stable method for accurately increasing nitrogen by bottom blowing molten steel by using CAS according to the control of the nitrogen blowing rate and the nitrogen blowing pressure of the ladle bottom blowing furnace and the control of the bottom blowing time, thereby replacing the process of increasing nitrogen by using circulating nitrogen or refining alloy by RH and reducing the production cost for smelting the molten steel of the high-nitrogen tin plate.
Description
Technical Field
The invention relates to the technical field of refining processes in the metallurgical industry, in particular to a method and a system for smelting high-nitrogen tin plate molten steel.
Background
At present, molten steel and molten steel for smelting high-nitrogen tin plate are mainly smelted and tapped by a converter under the control of a converter and in an RH (RH vacuum circulation degassing refining) common operation mode. In the RH operation process, the circulating gas is switched from argon to nitrogen to increase nitrogen in the molten steel, because the RH process is high in cost and a steel plant mainly needs RH to smelt ultra-low carbon steel, the RH process is used for smelting high-nitrogen tin-plated sheet molten steel, the production cost is increased, and the RH deep decarburization smelting automobile sheet can not fully play the function due to the large RH capacity. Therefore, it is necessary to develop a low-cost process for smelting molten steel of high-nitrogen tin-plated plate without occupying RH production energy.
Disclosure of Invention
The embodiment of the application provides a method and a system for smelting high-nitrogen tin plate molten steel, and solves the technical problem that the existing method for smelting high-nitrogen tin plate molten steel is high in cost.
On one hand, the present application provides the following technical solutions through an embodiment of the present application:
a method of smelting high nitrogen tin plate molten steel for controlling a ladle bottom blowing furnace, the method comprising:
measuring the nitrogen content of the molten steel in the ladle bottom blowing furnace to obtain a first nitrogen content;
obtaining bottom-blown nitrogen time t based on the target nitrogen content, the first nitrogen content and the nitrogen blowing rate of the ladle bottom-blown furnace; wherein the nitrogen blowing rate of the ladle bottom blowing furnace is 550-650L/min, and the nitrogen blowing pressure of the ladle bottom blowing furnace is 1.5-2.0 MPa;
and controlling the ladle bottom-blowing furnace to be switched into bottom-blowing nitrogen, and continuously blowing nitrogen to the molten steel for t time according to the nitrogen blowing rate and the nitrogen blowing pressure to obtain first target molten steel.
Optionally, before the determining the nitrogen content of the molten steel in the ladle bottom-blowing furnace, the method further comprises:
and blowing argon gas to the bottom of the molten steel by using the ladle bottom blowing furnace.
Optionally, the flow rate of the bottom-blown argon is 350-1000L/min, and the bottom-blown brick time is 1-20 times.
Optionally, before the determining the nitrogen content of the molten steel in the ladle bottom-blowing furnace, the method further comprises:
measuring the temperature of the molten steel, and judging whether the temperature of the molten steel is within a first preset temperature interval value; wherein the first predetermined temperature range is 1600-1610 ℃.
And if the temperature of the molten steel is within the first preset temperature interval value, executing the step of measuring the nitrogen content of the molten steel in the ladle bottom blowing furnace.
Optionally, if the temperature of the molten steel is not within the first preset temperature interval value, the temperature of the molten steel is adjusted, so that the adjusted temperature of the molten steel is within the first preset temperature interval value.
Optionally, after the obtaining of the first target molten steel, the method further includes:
controlling the ladle bottom-blowing furnace to be switched into bottom-blowing argon, and measuring the nitrogen content of the first target molten steel to obtain a second nitrogen content;
if the second nitrogen content does not reach the target nitrogen content, obtaining bottom nitrogen blowing time t' based on the target nitrogen content, the second nitrogen content and the nitrogen blowing rate of the ladle bottom blowing furnace;
and controlling the ladle bottom-blowing furnace to be switched into bottom-blowing nitrogen, and continuously blowing nitrogen for t' time to the molten steel according to the nitrogen blowing rate and the nitrogen blowing pressure to obtain second target molten steel.
Optionally, after the obtaining of the second target molten steel, the method further includes:
measuring the temperature of the second target molten steel, and judging whether the temperature of the second target molten steel is within a second preset temperature interval value; wherein the second predetermined temperature range is 1580-.
And if the temperature of the second target molten steel is not within the second preset temperature interval value, adjusting the temperature of the second target molten steel to enable the adjusted temperature of the second target molten steel to be within the second preset temperature interval value.
Optionally, the first nitrogen content is 10-40 ppm.
Optionally, the target nitrogen content is 30-60 ppm.
In another aspect, the present application provides a system for smelting high-nitrogen tin plate molten steel, for controlling a ladle bottom blowing furnace, according to another embodiment of the present application, the system including:
the measuring module is used for measuring the nitrogen content of the molten steel in the ladle bottom blowing furnace to obtain a first nitrogen content;
a first obtaining module, configured to obtain a bottom-blown nitrogen time t based on a target nitrogen content, the first nitrogen content, and a nitrogen-blowing rate of the ladle bottom-blowing furnace; wherein the nitrogen blowing rate of the ladle bottom blowing furnace is 550-650L/min, and the nitrogen blowing pressure of the ladle bottom blowing furnace is 1.5-2.0 MPa;
and the second obtaining module is used for controlling the ladle bottom-blowing furnace to be switched into bottom-blowing nitrogen, and continuously blowing nitrogen to the molten steel for t time according to the nitrogen blowing rate and the nitrogen blowing pressure to obtain first target molten steel.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the method is used for controlling the ladle bottom blowing furnace; measuring the nitrogen content of the molten steel in the ladle bottom blowing furnace to obtain a first nitrogen content; obtaining bottom-blown nitrogen time t based on the target nitrogen content, the first nitrogen content and the nitrogen blowing rate of the ladle bottom-blown furnace; wherein the nitrogen blowing rate of the ladle bottom blowing furnace is 550-650L/min, and the nitrogen blowing pressure of the ladle bottom blowing furnace is 1.5-2.0 MPa; and controlling the ladle bottom-blowing furnace to be switched into bottom-blowing nitrogen, and continuously blowing nitrogen to the molten steel for t time according to the nitrogen blowing rate and the nitrogen blowing pressure to obtain first target molten steel. The invention establishes a stable method for accurately increasing nitrogen by bottom blowing molten steel by using CAS according to the control of the nitrogen blowing rate and the nitrogen blowing pressure of the ladle bottom blowing furnace and the control of the bottom blowing time, thereby replacing the process of increasing nitrogen by using circulating nitrogen or refining alloy by RH and reducing the production cost for smelting the molten steel of the high-nitrogen tin plate.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a method for smelting molten steel of a high-nitrogen tin-plated plate according to an embodiment of the present invention;
FIG. 2 is a block diagram showing the structure of a system for smelting high-nitrogen tin plate molten steel in one embodiment of the present invention.
Detailed Description
The embodiment of the application provides a method and a system for smelting high-nitrogen tin plate molten steel, and solves the technical problem that the cost for smelting the high-nitrogen tin plate molten steel is high in the prior art.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
a method for smelting high-nitrogen tin plate molten steel is used for controlling a ladle bottom blowing furnace; the method comprises the following steps: measuring the nitrogen content of the molten steel in the ladle bottom blowing furnace to obtain a first nitrogen content; obtaining bottom-blown nitrogen time t based on the target nitrogen content, the first nitrogen content and the nitrogen blowing rate of the ladle bottom-blown furnace; wherein the nitrogen blowing rate of the ladle bottom blowing furnace is 550-650L/min, and the nitrogen blowing pressure of the ladle bottom blowing furnace is 1.5-2.0 MPa; and controlling the ladle bottom-blowing furnace to be switched into bottom-blowing nitrogen, and continuously blowing nitrogen to the molten steel for t time according to the nitrogen blowing rate and the nitrogen blowing pressure to obtain first target molten steel.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
First, it is stated that the term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Example one
The embodiment provides a method for smelting high-nitrogen tin plate molten steel, which is used for controlling a ladle bottom blowing furnace and comprises the following steps of:
s101, measuring the nitrogen content of molten steel in the ladle bottom blowing furnace to obtain a first nitrogen content;
s102, obtaining bottom nitrogen blowing time t based on target nitrogen content, the first nitrogen content and the nitrogen blowing rate of the ladle bottom blowing furnace; wherein the nitrogen blowing rate of the ladle bottom blowing furnace is 550-650L/min, and the nitrogen blowing pressure of the ladle bottom blowing furnace is 1.5-2.0 MPa;
s103, controlling the ladle bottom-blowing furnace to be switched to bottom-blowing nitrogen, and continuously blowing nitrogen to the molten steel for t time according to the nitrogen blowing rate and the nitrogen blowing pressure to obtain first target molten steel.
The CAS is a method for carrying out ladle sealing argon blowing and component fine adjustment, has the functions of blowing argon to a ladle and homogenizing the component temperature of molten steel, and can also carry out chemical temperature rise by adding aluminum and blowing oxygen, component fine adjustment, alloy yield improvement and elimination of large-scale inclusions in the molten steel. Oxygen blowing by an oxygen lance and oxidation of aluminum release heat to heat up molten steel, fine adjustment of iron alloy components and uniform molten steel temperature under the protection of inert gas, wire feeding and weak argon blowing treatment of the molten steel, change of inclusion form and purification of the molten steel, namely a CAS system. The ladle bottom-blowing furnace in this embodiment is a device in the CAS.
CAS is a refining process with simple investment, lower process cost and better molten steel quality, and is mainly used for bottom blowing argon to homogenize molten steel components and reduce the temperature. Therefore, the purge control of argon is not stable and precise. Therefore, the CAS is used for taking bottom-blown nitrogen as a cheap nitrogen increasing mode, how to increase nitrogen in molten steel by adopting the bottom-blown nitrogen and stably control the nitrogen content in the molten steel are critical in ensuring that the bottom-blown nitrogen effect is stable and the nitrogen increasing rate is stable in the CAS process so as to reduce the cost for smelting the high-nitrogen tin plate.
Therefore, the embodiment provides a method for smelting high-nitrogen tin plate molten steel. The steps are explained in detail below with reference to the drawings.
Referring to fig. 1, S101 is first performed to measure a nitrogen content of molten steel in the ladle bottom-blowing furnace to obtain a first nitrogen content;
it should be noted that, in the default state, the ladle bottom-blowing furnace is bottom-blowing argon, and if nitrogen is to be bottom-blown, the bottom-blowing time needs to be calculated in advance. The nitrogen content of the molten steel is measured to ensure that the nitrogen content is 10-40ppm after the furnace, so that the nitrogen content of the molten steel is prevented from being too high or too low, and good conditions are provided for CAS nitrogen increasing smelting of high-nitrogen tin plate molten steel. Meanwhile, a basis is provided for the subsequent calculation of the bottom blowing time.
S102, obtaining bottom nitrogen blowing time t based on target nitrogen content, the first nitrogen content and the nitrogen blowing rate of the ladle bottom blowing furnace; wherein the nitrogen blowing rate of the ladle bottom blowing furnace is 550-650L/min, and the nitrogen blowing pressure of the ladle bottom blowing furnace is 1.5-2.0 MPa;
specifically, the target nitrogen content is 30-60 ppm. Therefore, the accurate bottom blowing nitrogen time t can be obtained according to the target nitrogen content, the first nitrogen content and the nitrogen blowing rate of the ladle bottom blowing furnace.
Wherein the nitrogen blowing rate of the ladle bottom blowing furnace is 550-650L/min, and the nitrogen blowing pressure of the ladle bottom blowing furnace is 1.5-2.0MPa, which are empirical values obtained by a large number of field tests, and the selection can be carried out in a numerical range according to different steel types, and the specific selection can also be carried out according to test data.
S103, controlling the ladle bottom-blowing furnace to be switched to bottom-blowing nitrogen, and continuously blowing nitrogen to the molten steel for t time according to the nitrogen blowing rate and the nitrogen blowing pressure to obtain first target molten steel.
And after the nitrogen time t is obtained, controlling the ladle bottom-blowing furnace to be switched from the default bottom-blowing argon gas to the bottom-blowing nitrogen gas, continuously blowing nitrogen into the molten steel for the time t according to the nitrogen blowing rate and the nitrogen blowing pressure, and diffusing and dissolving the nitrogen in the molten steel, so that the content of the molten steel is increased, and the first target molten steel is obtained.
It should be noted that, at this time, the nitrogen content of the first target molten steel obtained does not necessarily satisfy 30 to 60ppm due to an error in the test or calculation.
To this end, as an alternative embodiment, after the obtaining of the first target molten steel, the method further includes:
controlling the ladle bottom-blowing furnace to be switched into bottom-blowing argon, and measuring the nitrogen content of the first target molten steel to obtain a second nitrogen content;
if the second nitrogen content does not reach the target nitrogen content, obtaining bottom nitrogen blowing time t' based on the target nitrogen content, the second nitrogen content and the nitrogen blowing rate of the ladle bottom blowing furnace;
and controlling the ladle bottom-blowing furnace to be switched into bottom-blowing nitrogen, and continuously blowing nitrogen for t' time to the molten steel according to the nitrogen blowing rate and the nitrogen blowing pressure to obtain second target molten steel.
Therefore, the nitrogen content in the first target molten steel is corrected to ensure that the nitrogen content meets the target nitrogen content, so that the quality of the molten steel is ensured, and the quality of high-nitrogen steel products obtained by the molten steel, such as high-nitrogen tin plates, is ensured.
In order to ensure the need for the subsequent process, as an alternative embodiment, after the obtaining of the second target molten steel, the method further includes:
measuring the temperature of the second target molten steel, and judging whether the temperature of the second target molten steel is within a second preset temperature interval value; wherein the second predetermined temperature range is 1580-.
And if the temperature of the second target molten steel is not within the second preset temperature interval value, adjusting the temperature of the second target molten steel to enable the adjusted temperature of the second target molten steel to be within the second preset temperature interval value.
Specifically, the temperature adjustment method can be to add scrap steel for cooling, and after cooling, pure argon blowing is carried out to ensure that impurities float sufficiently, the refining finishing temperature is 1580 and 1590 ℃, and the requirements of downstream processes are met.
As an alternative embodiment, in order to perform advanced detection on the bottom-blowing system and ensure the smoothness of the bottom-blowing system, the method further comprises the following steps before the step of determining the nitrogen content of the molten steel in the ladle bottom-blowing furnace:
and blowing argon gas to the bottom of the molten steel by using the ladle bottom blowing furnace. The smoothness of a bottom blowing system is ensured, the nitrogen increasing stability of nitrogen blowing molten steel is ensured, and the high hit rate of CAS nitrogen increasing is realized.
Specifically, the flow rate of the bottom blowing argon is 350-1000L/min, and the bottom blowing brick time is 1-20 times.
It should be noted that the ladle bottom-blowing furnace performs bottom-blowing of nitrogen and argon by using bottom-blowing rotation with holes, and the blowing effect is poor due to multiple use of bottom-blowing bricks, so that the number of bottom-blowing bricks is 1-20.
As an alternative embodiment, in order to perform advanced detection on the bottom-blowing system and ensure the smoothness of the bottom-blowing system, before the measuring the nitrogen content of the molten steel in the ladle bottom-blowing furnace, the method further comprises the following steps:
measuring the temperature of the molten steel, and judging whether the temperature of the molten steel is within a first preset temperature interval value; wherein the first predetermined temperature range is 1600-1610 ℃.
And if the temperature of the molten steel is within the first preset temperature interval value, executing the step of measuring the nitrogen content of the molten steel in the ladle bottom blowing furnace. The temperature requirement for diffusion and dissolution in molten steel is met, and meanwhile, in order to meet the temperature requirement of a subsequent process after nitrogen is added, the temperature is reduced in advance.
And if the temperature of the molten steel is not within the first preset temperature interval value, adjusting the temperature of the molten steel to enable the adjusted temperature of the molten steel to be within the first preset temperature interval value.
Specifically, the temperature adjustment method can be to add scrap steel for cooling, and after cooling, the refining finishing temperature is guaranteed to be 1600-1590 ℃, so that the temperature of the molten steel after nitrogen addition is 1580-1590 ℃ as far as possible, and the downstream process requirements are met.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
the method is used for controlling the ladle bottom blowing furnace; measuring the nitrogen content of the molten steel in the ladle bottom blowing furnace to obtain a first nitrogen content; obtaining bottom-blown nitrogen time t based on the target nitrogen content, the first nitrogen content and the nitrogen blowing rate of the ladle bottom-blown furnace; wherein the nitrogen blowing rate of the ladle bottom blowing furnace is 550-650L/min, and the nitrogen blowing pressure of the ladle bottom blowing furnace is 1.5-2.0 MPa; and controlling the ladle bottom-blowing furnace to be switched into bottom-blowing nitrogen, and continuously blowing nitrogen to the molten steel for t time according to the nitrogen blowing rate and the nitrogen blowing pressure to obtain first target molten steel. According to the control of the nitrogen blowing rate and the nitrogen blowing pressure of the ladle bottom blowing furnace and the control of the bottom blowing time, the method for stably and accurately increasing the nitrogen content of the molten steel by bottom blowing by using the CAS is established, so that the process of increasing the nitrogen content by using circulating nitrogen or refining alloy by using RH is replaced, and the production cost for smelting the molten steel of the high-nitrogen tin plate is reduced; meanwhile, due to the stable control of bottom-blown nitrogen, the hit rate of nitrogen increase is ensured, and the generation efficiency is improved.
Specifically, compared with the RH smelting high-nitrogen tin plate, the CAS bottom blowing nitrogen gas smelting tin plate is adopted, so that the production cost can be reduced, the RH smelting pressure is reduced, the variety proportion of the RH smelting IF steel is improved, and the profit of the product is increased. In addition, the production process of the high-nitrogen tin plate is widened, the RH production pressure is reduced, and the flexible organization of production and maintenance is facilitated.
The cost savings can be estimated as follows:
compared with the RH process for smelting the high-nitrogen tin plate, the CAS process for smelting the tin plate by blowing nitrogen at the bottom is adopted, the refining period is shortened, the tapping temperature is reduced, the benefit is 6.28 yuan/ton, the refractory material consumption cost is reduced by 8.66 yuan/ton, the RH steam consumption cost is reduced by 8.49 yuan/ton, the cost per ton of steel is reduced by 23.33 yuan after the total process optimization, the average smelting of the high-nitrogen tin plate is 25 furnaces per month, and the annual benefit is 12 × 25 × 300 × 23.60 to 2099700 yuan if the molten steel in each furnace is calculated according to 300 tons.
Example two
Based on the same inventive concept as the first embodiment, the present embodiment provides a system for smelting molten steel of a high-nitrogen tin plate, which is used for controlling a ladle bottom blowing furnace, and the system described with reference to fig. 2 includes:
the measuring module is used for measuring the nitrogen content of the molten steel in the ladle bottom blowing furnace to obtain a first nitrogen content;
a first obtaining module, configured to obtain a bottom-blown nitrogen time t based on a target nitrogen content, the first nitrogen content, and a nitrogen-blowing rate of the ladle bottom-blowing furnace; wherein the nitrogen blowing rate of the ladle bottom blowing furnace is 550-650L/min, and the nitrogen blowing pressure of the ladle bottom blowing furnace is 1.5-2.0 MPa;
and the second obtaining module is used for controlling the ladle bottom-blowing furnace to be switched into bottom-blowing nitrogen, and continuously blowing nitrogen to the molten steel for t time according to the nitrogen blowing rate and the nitrogen blowing pressure to obtain first target molten steel.
Since the system for smelting molten steel of a high-nitrogen tin plate described in this embodiment is a system used for implementing the method for smelting molten steel of a high-nitrogen tin plate according to the embodiment of the present application, a person skilled in the art can understand a specific implementation manner of the system of this embodiment and various variations thereof based on the method for smelting molten steel of a high-nitrogen tin plate described in the first embodiment of the present application, and therefore, how to implement the method in the embodiment of the present application by the system is not described in detail herein. The system adopted by the person skilled in the art to implement the method for smelting high-nitrogen tin plate molten steel in the embodiment of the present application is within the protection scope of the present application.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for smelting high-nitrogen tin plate molten steel is characterized by being used for controlling a ladle bottom blowing furnace, and the method comprises the following steps:
measuring the nitrogen content of the molten steel in the ladle bottom blowing furnace to obtain a first nitrogen content;
obtaining bottom-blown nitrogen time t based on the target nitrogen content, the first nitrogen content and the nitrogen blowing rate of the ladle bottom-blown furnace; wherein the nitrogen blowing rate of the ladle bottom blowing furnace is 550-650L/min, and the nitrogen blowing pressure of the ladle bottom blowing furnace is 1.5-2.0 MPa;
and controlling the ladle bottom-blowing furnace to be switched into bottom-blowing nitrogen, and continuously blowing nitrogen to the molten steel for t time according to the nitrogen blowing rate and the nitrogen blowing pressure to obtain first target molten steel.
2. The method of claim 1, wherein prior to the determining the nitrogen content of the molten steel in the ladle bottom blowing furnace, the method further comprises:
and blowing argon gas to the bottom of the molten steel by using the ladle bottom blowing furnace.
3. The method as claimed in claim 2, wherein the flow rate of the bottom-blown argon gas is 350-1000L/min, and the number of bottom-blown bricks is 1-20.
4. The method of claim 1, wherein prior to the determining the nitrogen content of the molten steel in the ladle bottom blowing furnace, the method further comprises:
measuring the temperature of the molten steel, and judging whether the temperature of the molten steel is within a first preset temperature interval value; wherein the first preset temperature interval value is 1600-1610 ℃;
and if the temperature of the molten steel is within the first preset temperature interval value, executing the step of measuring the nitrogen content of the molten steel in the ladle bottom blowing furnace.
5. The method of claim 4, wherein if the temperature of the molten steel is not within the first preset temperature interval value, the temperature of the molten steel is adjusted such that the adjusted temperature of the molten steel is within the first preset temperature interval value.
6. The method of claim 1, wherein after the obtaining the first target molten steel, the method further comprises:
controlling the ladle bottom-blowing furnace to be switched into bottom-blowing argon, and measuring the nitrogen content of the first target molten steel to obtain a second nitrogen content;
if the second nitrogen content does not reach the target nitrogen content, obtaining bottom nitrogen blowing time t' based on the target nitrogen content, the second nitrogen content and the nitrogen blowing rate of the ladle bottom blowing furnace;
and controlling the ladle bottom-blowing furnace to be switched into bottom-blowing nitrogen, and continuously blowing nitrogen for t' time to the molten steel according to the nitrogen blowing rate and the nitrogen blowing pressure to obtain second target molten steel.
7. The method of claim 6, wherein after the obtaining the second target molten steel, the method further comprises:
measuring the temperature of the second target molten steel, and judging whether the temperature of the second target molten steel is within a second preset temperature interval value; wherein the second preset temperature interval value is 1580-1590 ℃;
and if the temperature of the second target molten steel is not within the second preset temperature interval value, adjusting the temperature of the second target molten steel to enable the adjusted temperature of the second target molten steel to be within the second preset temperature interval value.
8. The method of claim 1, wherein the first nitrogen content is 10-40 ppm.
9. The method of claim 1, wherein the target nitrogen content is 30-60 ppm.
10. A system for smelting high-nitrogen tin plate molten steel is used for controlling a ladle bottom blowing furnace, and comprises:
the measuring module is used for measuring the nitrogen content of the molten steel in the ladle bottom blowing furnace to obtain a first nitrogen content;
a first obtaining module, configured to obtain a bottom-blown nitrogen time t based on a target nitrogen content, the first nitrogen content, and a nitrogen-blowing rate of the ladle bottom-blowing furnace; wherein the nitrogen blowing rate of the ladle bottom blowing furnace is 550-650L/min, and the nitrogen blowing pressure of the ladle bottom blowing furnace is 1.5-2.0 MPa;
and the second obtaining module is used for controlling the ladle bottom-blowing furnace to be switched into bottom-blowing nitrogen, and continuously blowing nitrogen to the molten steel for t time according to the nitrogen blowing rate and the nitrogen blowing pressure to obtain first target molten steel.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115505681A (en) * | 2022-10-18 | 2022-12-23 | 山东莱钢永锋钢铁有限公司 | Control prediction method for nitrogen content in molten steel |
| CN115820985A (en) * | 2022-11-25 | 2023-03-21 | 山东钢铁股份有限公司 | Method for accurately controlling nitrogen content of molten steel of deformed steel bar |
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| CN115820985A (en) * | 2022-11-25 | 2023-03-21 | 山东钢铁股份有限公司 | Method for accurately controlling nitrogen content of molten steel of deformed steel bar |
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