Deformed steel bar smelting method

Abstract

The invention discloses a deformed steel bar smelting method which comprises the following steps: filling molten iron and scrap steel into a converter in proportion for blowing, and injecting the molten steel into a steel ladle for vacuum degassing treatment after various process parameters of the molten steel reach preset tapping standards. In the process, argon is blown in to promote the molten steel to roll and stir, gas impurities in the molten steel are effectively removed, and the purity of the molten steel is remarkably improved. And the molten steel subjected to vacuum degassing treatment enters a continuous casting link immediately, and is cooled and solidified to form a final deformed steel bar product. According to the process, a traditional LF furnace treatment link is omitted, the VD furnace is directly adopted for refining, on one hand, component fluctuation possibly caused by the LF furnace is avoided, and the high stability of molten steel components is ensured; and on the other hand, by simplifying the technological process, the consistency of the quality and performance of the steel is improved, meanwhile, the production cost is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of steelmaking technology, and more particularly to a method for smelting rebar. Background Technology

[0002] Currently, rebar mainly adopts the production process route of converter steelmaking-LF furnace refining-continuous casting. This process has a long smelting cycle and high energy consumption, resulting in high overall production costs. Summary of the Invention

[0003] In view of this, this application provides a rebar smelting method to solve the problem that the production process route of converter steelmaking-LF furnace refining-continuous casting has a long smelting cycle and high energy consumption, resulting in high overall production costs.

[0004] According to one aspect of this application, a method for smelting rebar is provided, comprising:

[0005] After mixing molten iron and scrap steel in a preset ratio and loading them into the converter, oxygen is blown into the converter to obtain molten steel.

[0006] Obtain the process parameters of the molten steel in the converter. When the process parameters meet the preset tapping standards, inject the molten steel in the converter into the ladle.

[0007] The ladle is subjected to vacuum degassing, and argon gas is blown into the ladle to stir the molten steel.

[0008] Molten steel was processed using a continuous casting process to obtain rebar samples.

[0009] In the aforementioned rebar smelting method, molten iron and scrap steel are charged into a converter for blowing. Once the various process parameters of the molten steel reach the preset tapping standards, it is poured into a ladle for vacuum degassing. During this process, argon gas is blown in to cause the molten steel to tumble and stir, effectively removing gaseous impurities and significantly improving the purity of the steel. The degassed steel then enters the continuous casting stage, and after cooling and solidification, it forms the final rebar product. This process eliminates the traditional LF furnace treatment step, directly using a VD furnace for refining. The VD furnace can efficiently complete key processes such as steel degassing and impurity removal in a vacuum environment. By precisely controlling parameters such as temperature, pressure, processing time, and alloy addition, precise control of the steel composition can be achieved. Compared to traditional processes, this smelting method, which omits the LF furnace and directly uses a VD furnace, avoids the compositional fluctuations that may occur with the LF furnace, ensuring high stability of the steel composition. Furthermore, by simplifying the process, it not only improves the consistency of steel quality and performance but also reduces production costs and increases production efficiency.

[0010] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0011] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals in different drawings represent the same or similar elements. In the drawings:

[0012] Figure 1 is a flowchart of a threaded steel smelting method in an embodiment of the present application. DETAILED DESCRIPTION

[0013] Exemplary embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood, and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0014] Referring to Figure 1 as shown, Figure 1 is a flowchart of a threaded steel smelting method in an embodiment of the present application, including the following steps:

[0015] S10: After the molten iron and scrap steel are mixed and loaded into the converter according to the preset ratio, oxygen is blown into the converter to obtain molten steel.

[0016] In this step, the molten iron and scrap steel are fully mixed according to the preset ratio and then loaded into the converter, and then oxygen is blown into the converter. The oxygen reacts violently with the molten iron and scrap steel in the converter, gradually converting them into molten steel.

[0017] S20: Obtain the process parameters of the molten steel in the converter, and when the process parameters meet the preset tapping standard, inject the molten steel in the converter into the ladle.

[0018] In this step, the process parameters of the molten steel in the converter are obtained, which include the temperature, composition content, and oxygen content of the molten steel, and other key indicators. The obtained process parameters are compared with the preset tapping standard. When all the process parameters meet the standard, the tapping operation is triggered, and the converter is tilted to accurately inject the qualified molten steel into the ladle through the tapping hole.

[0019] In an embodiment of the present application, a specific converter tapping scheme is provided, in which the process parameters of the molten steel in the converter are obtained in S20, and when the process parameters meet the preset tapping standard, the molten steel in the converter is poured into the ladle, specifically including the following steps S21-S25:

[0020] S21: Obtain the process parameters of the molten steel in the converter, wherein the process parameters include at least one of the following: molten steel temperature, carbon content in molten steel, and oxygen activity.

[0021] S22: When the molten steel temperature reaches the preset temperature threshold, the carbon content reaches the first preset content threshold, and the oxygen activity value reaches the preset activity threshold, it is determined that the molten steel meets the preset tapping standard, the oxygen blowing into the converter is stopped, and the molten steel in the converter is poured into the ladle.

[0022] For steps S21-S22, the process parameters of the molten steel in the converter are detected by a sub-lance detection system, including the real-time temperature of the molten steel, the specific content of carbon elements in the molten steel, and the oxygen activity. The molten steel temperature reflects the thermal state of the molten steel, the carbon element determines the basic performance of the steel, and the oxygen activity reflects the purity and chemical activity of the molten steel. Compare the obtained process parameters with the pre-set standard. Only when the molten steel temperature reaches the preset temperature threshold, that is, not too high to cause unstable steel performance, and not too low to affect subsequent processing; the carbon content meets the first content threshold, ensuring that the steel has the required strength and toughness; and the oxygen activity reaches the preset activity threshold, ensuring the accuracy and quality of the molten steel, it is determined that the molten steel has completely met the pre-set tapping standard, the tapping operation is triggered, and the converter is tilted to accurately pour the qualified molten steel into the ladle through the tapping hole.

[0023] Optionally, based on the quality requirements of the deformed steel bar and the needs of the subsequent processing process, the preset temperature threshold, the first preset content threshold, and the preset activity threshold are set, which are not limited in the present application.

[0024] In the above manner, it is ensured that each batch of steel can meet the high quality requirements.

[0025] In actual application scenarios, accurately controlling various process parameters of molten steel at the end of the converter blowing process is crucial to ensure the quality of steel. 2-3 minutes before the end of blowing, the sub-lance is inserted into the molten steel in the converter to accurately detect important parameters of the molten steel. At this time, the composition and temperature of the molten steel are close to the final state, and accurate final parameter information can be obtained through detection to accurately adjust the blowing process in the last stage. Among them, the detection of molten steel temperature can understand the thermal state of the molten steel, which has an important influence on the subsequent processing and forming process; the detection accuracy of carbon content can reach ±0.02%, which plays a decisive role in the strength, toughness and other properties of steel; the detection accuracy of oxygen activity is ±50ppm, thereby accurately reflecting the purity and chemical activity of the molten steel.

[0026] In an embodiment of the present application, a specific primary refining furnace endpoint composition precise control scheme is provided, that is, during the process of blowing oxygen into the converter, the following steps are further included:

[0027] Based on the carbon element content in the molten steel and the target carbon element content, a carbon element content fluctuation value is determined.

[0028] Based on the carbon element content fluctuation value, the preset fluctuation threshold, the carbon element content value and the preset range, the oxygen blowing time is adjusted.

[0029] In this embodiment, in the steel smelting process, accurately regulating the carbon element content in the molten steel is the key to ensure that the quality of steel meets the standards. Therefore, based on the real-time detected carbon element content in the molten steel and the pre-set target carbon element content, a carbon element content fluctuation value is calculated to reflect the degree of deviation between the current carbon content in the molten steel and the target value. Thereafter, the system will continuously compare the detected carbon content data with the target range. Once the deviation of the carbon content is found, the oxygen blowing time will be automatically adjusted according to the size and direction of the deviation. If the carbon content is too high, the oxygen blowing time will be appropriately extended to reduce the carbon content through oxidation reaction; if the carbon content is too low, the oxygen blowing time will be shortened to reduce the oxidation loss of carbon.

[0030] Optionally, considering various factors such as the quality standards of steel, subsequent processing requirements, and the stability of production process, the preset fluctuation threshold and the target range are determined to strictly control the fluctuation of carbon content within ≤±0.03%, and the carbon content in the molten steel is stably maintained in the ideal interval of 0.10%-0.18%.

[0031] In the above manner, based on the fluctuation of carbon element content in the molten steel, the oxygen blowing time is dynamically adjusted to ensure the stability of the quality of the molten steel and meet the production requirements.

[0032] In one embodiment of the present application, a specific blowing refining component precision control scheme is provided, i.e. obtaining the process parameters of the molten steel in the converter, when the process parameters meet the preset tapping standard, before the molten steel in the converter is injected into the ladle, the method further comprises the following steps:

[0033] obtaining the carbon monoxide element content and the carbon dioxide element content in the converter;

[0034] determining the ratio of carbon monoxide and carbon dioxide in the converter based on the carbon monoxide element content and the carbon dioxide element content;

[0035] determining the predicted content of manganese element and the predicted content of phosphorus element in the molten steel when the converter is tapped based on the ratio;

[0036] determining the first deviation value of the manganese element based on the predicted content of the manganese element and the target content of the manganese element;

[0037] determining the second deviation value of the phosphorus element based on the predicted content of the phosphorus element and the target content of the phosphorus element;

[0038] if the first deviation value is greater than the first preset deviation threshold and / or the second deviation value is greater than the second preset deviation threshold, performing alloy addition operation on the molten steel in the converter;

[0039] if the first deviation value is less than or equal to the first preset deviation threshold, and the second deviation value is less than or equal to the second preset deviation threshold, no alloy addition operation is needed, and the molten steel in the converter is injected into the ladle.

[0040] In this embodiment, during the converter blowing process, a series of complex chemical reactions occur in the furnace, in which the oxidation of carbon generates carbon monoxide (CO) and carbon dioxide (CO2). Different reaction stages and molten steel components will cause the ratio of CO and CO2 in the furnace gas to change. By monitoring this ratio in real time, the oxidation of carbon in the molten steel and the reaction state of other elements can be reflected. For this purpose, with the help of a furnace gas analyzer, the carbon monoxide element content and the carbon dioxide element content in the converter are accurately obtained. After obtaining the element content of carbon monoxide and carbon dioxide, the ratio of carbon monoxide and carbon dioxide in the converter is calculated, which can directly reflect the balance state of the oxidation-reduction reaction in the converter, and then the predicted content of manganese element and phosphorus element in the molten steel when the converter is tapped is predicted. Manganese and phosphorus elements play an important role in steel, and their content directly affects the strength, toughness, corrosion resistance and other key properties of steel.

[0041] After that, the predicted content of manganese element is compared with the pre-set target content of manganese element in detail, and the first deviation value of manganese element is calculated. Similarly, the predicted content of phosphorus element is compared with the target content of phosphorus element, and the second deviation value of phosphorus element is obtained to show the gap between the predicted content and the target content. If the first deviation value is greater than the first pre-set deviation threshold, it means that the content of manganese element deviates from the target value too much, which may affect the performance of the steel; if the second deviation value is greater than the second pre-set deviation threshold, it indicates that the content of phosphorus element also does not meet the requirements. In this case, alloy addition operation needs to be performed on the molten steel in the converter. By accurately adding appropriate alloy elements, the composition of the molten steel is finely adjusted, so that the content of manganese element and phosphorus element is as close to the target content as possible, thereby ensuring the stability and reliability of the steel quality.

[0042] Further, if the first deviation value is less than or equal to the first pre-set deviation threshold, it indicates that the difference between the predicted content and the target content of manganese element in the molten steel is within an acceptable range, and the content of manganese element is ideal. Moreover, the second deviation value is also less than or equal to the second pre-set deviation threshold, which means that the predicted content of phosphorus element also meets the target requirements and does not need to be adjusted additionally. In this case, it is indicated that the composition of the molten steel has reached the expected standard accurately, and alloy addition operation is not needed to adjust the composition. At this time, the molten steel in the converter can be smoothly and orderly injected into the ladle according to the established process, so as to prepare for the subsequent refining, casting and other processes, and ensure that the entire production process is efficient and smooth, and finally high-quality steel products are produced.

[0043] In actual application scenarios, the CO / CO2 ratio in the furnace gas is related to the content of manganese (Mn) and phosphorus (P) elements in the molten steel. By establishing a suitable mathematical model, the content of Mn and P in the molten steel can be predicted using the monitored CO / CO2 ratio. This high-precision prediction helps to accurately grasp the composition of the molten steel and provides a reliable basis for subsequent adjustment. When the predicted Mn content deviation is > 0.10%, i.e., the difference between the predicted Mn content and the target Mn content exceeds 0.10%, the system will automatically trigger the alloy addition program. For example, if the target Mn content is 0.60%, and the predicted Mn content is less than 0.50% or greater than 0.70%, the program will be triggered.

[0044] In the above manner, real-time monitoring of the CO / CO2 ratio can predict the Mn and P content of the molten steel, and automatically trigger the alloy addition program when the Mn and P content deviation is large, thereby achieving accurate control of the steelmaking process and improving the quality and production efficiency of the molten steel.

[0045] In one embodiment of this application, a specific alloy addition scheme is provided, namely, if a first deviation value is greater than a first preset deviation threshold and / or a second deviation value is greater than a second preset deviation threshold, an alloy addition operation is performed on the molten steel in the converter, specifically including the following steps:

[0046] When the first deviation value is greater than the first preset deviation threshold, the first alloying element to be added is determined based on the manganese element.

[0047] The first addition amount of the first additive alloy is determined based on the predicted manganese content, the target manganese content, the weight of molten steel, the manganese loss due to burn-off, and the manganese recovery rate.

[0048] The first additive alloy is added to the molten steel according to the first addition amount;

[0049] When the second deviation value is greater than the second preset deviation threshold, the alloying element of the second added alloy is determined based on the phosphorus element.

[0050] The second addition amount of the second additive alloy is determined based on the predicted phosphorus content, the target phosphorus content, the weight of molten steel, the phosphorus burn-off amount, and the phosphorus recovery rate.

[0051] The second additive alloy is added to the molten steel according to the second addition amount.

[0052] In this embodiment, when the detected first deviation value is greater than the first preset deviation threshold, it indicates that there is a significant difference between the actual and target manganese content in the molten steel, requiring timely adjustment. At this point, based on the characteristics of manganese and the specific conditions of the molten steel, the alloying element of the first additive alloy (such as silicon-manganese) is determined to effectively adjust the manganese content in the molten steel, bringing it closer to the target value. Furthermore, to accurately add the alloy, multiple factors are comprehensively considered, including the predicted manganese content, the target manganese content, the actual weight of the molten steel, the manganese loss during smelting, and the manganese recovery rate, to calculate the first addition amount of the first additive alloy.

[0053] Specifically, the formula for calculating the mass of the added alloy is as follows:

[0054]

[0055] Among them, W 合金 The amount of the first alloy added; C 目标 The target content for manganese; C 预测 Predicting manganese content; ΔC 烧损 The burn-off of the first added alloy; Q 钢水 f is the weight of the molten steel; 收得率 The yield of manganese is given.

[0056] After the first addition amount is determined, the first additive alloy is uniformly added to the molten steel according to the value.

[0057] Similarly, when the second deviation value is greater than the second preset deviation threshold, it means that the content of phosphorus element in the molten steel does not meet the expectation and needs to be adjusted. Based on the characteristics of the phosphorus element and the requirements of the molten steel, the alloy elements of the second additive alloy are determined. Then, as in the case of manganese element, the second addition amount of the second additive alloy is accurately calculated by comprehensively considering factors such as the predicted content of phosphorus element, the target content of phosphorus element, the weight of molten steel, the burn loss of phosphorus element, and the recovery rate of phosphorus element. Finally, the second additive alloy is added to the molten steel according to the second addition amount.

[0058] In the above manner, we can effectively adjust the content of manganese and phosphorus elements in the molten steel to meet the target requirements, thereby ensuring that the produced threaded steel has stable and excellent quality.

[0059] In actual application scenarios, manganese is an important alloying element that can improve the strength, toughness, and hardenability of steel. When the predicted Mn content deviation is large, it indicates that the Mn content in the molten steel may not meet the production requirements and needs to be adjusted by adding alloy. The alloy selection usually chooses to add silicon-manganese alloy in advance. Silicon-manganese alloy is a commonly used steelmaking alloy that contains silicon and manganese elements. Adding silicon-manganese alloy can simultaneously supplement manganese and silicon elements in the molten steel, which helps to adjust the composition of the molten steel to meet the target requirements. In the alloy addition link of steelmaking, different types of alloys have their own unique performance, mainly in terms of recovery rate and burn loss compensation. Specifically, the recovery rate of ferrosilicon alloy is between 90% and 95%, and +0.02% silicon element burn loss compensation is required; the recovery rate of silicon-manganese alloy is between 85% and 90%, and +0.03% manganese element burn loss compensation is required; the recovery rate of niobium-iron alloy is between 75% and 80%, and +0.01% niobium element burn loss compensation is required.

[0060] In an embodiment of the present application, a specific converter tapping scheme is provided, i.e., if the first deviation value is less than or equal to the first preset deviation threshold and the second deviation value is less than or equal to the second preset deviation threshold, no alloy addition operation is required, and the molten steel in the converter is injected into the ladle, specifically including the following steps:

[0061] Based on the alloy elements in the molten steel, the alloy elements of the third additive alloy are determined;

[0062] The weight of the molten steel, the content of the alloy in the molten steel, the target content of the alloy, the burn loss of the alloy, and the recovery rate of the alloy are obtained;

[0063] determine the third adding amount of the third additive alloy based on the weight of the molten steel, the alloy content in the molten steel, the target content of the alloy, the alloy loss in smelting, and the alloy yield;

[0064] divide the third adding amount into the first target adding amount and the second target adding amount based on a preset ratio;

[0065] inject the molten steel in the converter into a ladle;

[0066] obtain the remaining amount of the molten steel in the converter during the injection of the molten steel into the ladle;

[0067] when the remaining amount reaches a first preset remaining threshold, add the first target adding amount of the third additive alloy to the ladle;

[0068] when the remaining amount reaches a second preset remaining threshold, add the second target adding amount of the third additive alloy to the ladle.

[0069] In this embodiment, in the converter steelmaking process, after the molten steel in the converter undergoes a series of smelting reactions to meet certain quality requirements, it needs to be poured into a ladle, which is called tapping. Alloy is added during tapping to adjust the chemical composition of the molten steel so that the steel has the required properties, such as strength, toughness, corrosion resistance, etc. Different feeding sequences and amounts will affect the melting effect and loss of the alloy, so it is crucial to reasonably arrange the feeding time and amount.

[0070] Specifically, according to the current alloy composition of the molten steel, the alloy elements required for the third additive alloy to be added during tapping are determined. Then, the weight of the molten steel, the existing alloy content in the molten steel (reflecting the current composition of the molten steel), the target content of the alloy (clearly indicating the composition standard to be achieved), the loss of the alloy during smelting, and the yield of the alloy are obtained. Based on these obtained data, the third adding amount of the third additive alloy is accurately determined. After the third adding amount is determined, it is divided into the first target adding amount and the second target adding amount according to a reasonable preset ratio. This allows the alloy to be more evenly distributed in the molten steel, thereby better exerting its function. Then, the converter is precisely controlled, and the molten steel is slowly and smoothly injected into the ladle. During this injection process, when the remaining amount of the molten steel in the converter reaches a first preset remaining threshold, the first target adding amount of the third additive alloy is added to the ladle, allowing it to mix fully with the flow of the molten steel and promoting melting by using the impact of the steel flow. As the molten steel continues to be injected into the ladle, when the remaining amount reaches a second preset remaining threshold, the second target adding amount of the third additive alloy is added to the ladle, reducing oxidation loss.

[0071] Specifically, the alloy adding mass calculation formula is:

[0072]

[0073] wherein W 合金 is the amount of the third alloy to be added; C 目标 is the target content of the alloy; C 检测 is the current content of the alloy; ΔC 烧损 is the burn loss of the third alloy; Q 钢水 is the weight of the molten steel; f 收得率 is the yield of the alloy.

[0074] Specifically, W 合金 represents the mass of the alloy to be added, usually in kilograms (kg) or tons (t), and is the specific amount of the alloy to be added in the smelting process in order to adjust the composition of the molten steel to the target value. C 目标 represents the content of a certain alloying element in the target composition of the molten steel. For example, when producing a certain steel, it is required that the content of manganese (Mn) in the molten steel reaches 0.5%. Therefore, C 目标 is 0.5%. This is the ideal composition ratio set in advance according to the performance requirements and production standards of the steel. C 检测 refers to the actual content of the alloying element in the molten steel obtained through detection means (such as lance detection). For example, it is detected that the actual content of manganese in the molten steel is 0.3%. ΔC 烧损 represents the burn loss of the alloying element during the process of adding the molten steel. During the steelmaking process, when the alloy is added to the high-temperature molten steel, part of the alloying element will react with oxygen, slag, etc. and be lost, and this part of the lost element content is represented by ΔC 烧损 . For example, due to high-temperature oxidation, etc., a certain percentage of manganese will be lost during the adding process. Assuming that the burn loss percentage is 0.05%, then ΔC 烧损 is 0.0005. Q 钢 refers to the mass of the molten steel, that is, the total weight of the molten steel currently participating in smelting, usually in kilograms (kg) or tons (t). The mass of the molten steel is used to calculate how much alloy needs to be added to achieve the target composition according to the composition difference. f 收得率 represents the percentage of the alloying element that actually enters the molten steel and plays a role after being added to the molten steel. Due to the existence of burn loss, combination with slag, etc., the alloying element will not all enter the molten steel. The yield is usually a percentage less than 1, for example, the yield of manganese is 90% (i.e. 0.9), which means that only 90% of the manganese in the added alloy can actually melt into the molten steel. In the formula, C 目标 -C 检测 + ΔC 烧损This part calculates the proportion of the alloy elements that need to be added to the molten steel to reach the target composition after considering the loss by oxidation. Multiply this proportion by the mass of the molten steel to obtain the mass of the alloy elements that need to be added. Finally, because of the yield problem of alloy elements, divide the mass of the alloy elements that need to be added by the yield to obtain the actual mass of the alloy that needs to be added.

[0075] In actual application scenarios, the addition of alloy begins when the converter is 1 / 3 tapped (i.e., when about one-third of the molten steel in the converter is poured into the ladle). At this time, 80% of the alloy is added. During the tapping process, a strong steel flow is formed when the molten steel flows from the converter into the ladle, which has a large impact. When 80% of the alloy is added to the ladle at this time, the impact of the steel flow can quickly disperse the alloy into the molten steel, increasing the contact area between the alloy and the molten steel. At the same time, the heat and stirring action brought by the steel flow also help to accelerate the melting speed of the alloy, allowing the alloy to melt into the molten steel more quickly and uniformly adjust the composition of the molten steel. Subsequently, when the converter is 2 / 3 tapped (i.e., when about two-thirds of the molten steel in the converter is poured into the ladle), the remaining 20% of the alloy is added (to reduce oxidation loss). The alloy is easily oxidized in the high-temperature molten steel, causing loss of alloy elements, resulting in a decrease in the amount of alloy that actually enters the molten steel to adjust the composition, which not only wastes alloy resources but also may affect the accurate control of the composition of the molten steel. Therefore, the remaining 20% of the alloy is added in the later stage of tapping. At this time, there is already a large amount of molten steel in the ladle, which protects the alloy to a certain extent, reducing the contact opportunities between the alloy and oxygen in the air, thereby reducing the degree of oxidation loss of the alloy, improving the utilization rate of the alloy, and ensuring the accuracy of the adjustment of the composition of the molten steel.

[0076] In the above manner, by adding the alloy in stages during the tapping process, the melting effect and oxidation loss of the alloy are comprehensively considered, which can more effectively achieve accurate adjustment of the composition of the molten steel and improve the quality and efficiency of steelmaking.

[0077] S30: Perform vacuum degassing treatment on the ladle, and blow argon into the ladle to stir the molten steel.

[0078] In this step, the ladle containing the molten steel is subjected to vacuum degassing treatment, wherein the vacuum degassing treatment (i.e., VD furnace treatment) refers to placing the molten steel in a vacuum environment to reduce the partial pressure of hydrogen, nitrogen, and other gases in the gas phase, so that hydrogen, nitrogen, and other gases in the molten steel continuously diffuse into the gas phase, thereby achieving the purpose of removing the gases. At the same time, under vacuum conditions, some low-melting-point impurities also volatilize into the gas phase and are removed, preventing the occurrence of hydrogen pores, white spots, and other defects in the steel during processing and use, and improving the plasticity, toughness, and fatigue resistance of the steel.

[0079] In practical applications, a VD furnace mainly consists of a vacuum vessel, a vacuum system, a ladle, a heating device (sometimes included), and an argon blowing and stirring device. Molten steel is poured into the ladle and pre-treated with necessary slag removal. A crane lifts the ladle into the vacuum vessel of the VD furnace and seals it. The vacuum system is activated, gradually reducing the pressure inside the vacuum vessel to the specified vacuum level, typically several Pascals or even lower. Simultaneously, argon gas is blown into the molten steel through the permeable bricks at the bottom of the ladle. The argon gas bubbles cause the molten steel to flow, creating agitation and promoting the removal of gases and impurities. Depending on the steel grade and process requirements, the treatment time is maintained at the specified vacuum level, generally 15-30 minutes, to ensure effective degassing. After treatment, an inert gas (such as nitrogen) is introduced into the vacuum vessel to restore the pressure to atmospheric pressure. A crane lifts the ladle out of the vacuum vessel for subsequent continuous casting processes.

[0080] The above method creates a vacuum environment inside the ladle, thereby reducing the gas content in the molten steel. During the vacuuming process, argon gas is blown into the ladle to thoroughly agitate the molten steel, promoting homogenization of its composition and improving its purity and quality stability.

[0081] In one embodiment of this application, a specific vacuum stirring scheme is provided. In S30, the ladle is subjected to vacuum degassing, and argon gas is blown into the ladle to stir the molten steel. This specifically includes the following steps S31-S36:

[0082] S31: According to multiple preset intervals, obtain multiple first contents of multiple alloying elements in the ladle.

[0083] In this step, prior to the vacuum degassing operation, the initial contents of various alloying elements in the ladle are precisely obtained according to several pre-set different ranges, and recorded as the first content. Obtaining the steel composition before VD treatment facilitates subsequent understanding of the impact of VD treatment on the uniformity of steel composition.

[0084] Optionally, since molten steel may exhibit compositional stratification within the ladle, the composition of the molten steel at different heights may vary. Therefore, multiple preset intervals are set to correspond to the upper, middle, and lower layers of the ladle, respectively. The lower layer corresponds to the area 10-15% above the bottom of the ladle; the middle layer corresponds to the middle part of the ladle (50% depth); and the upper layer corresponds to the area within 0.3m below the molten steel surface (the top 10% area). Sampling from the upper, middle, and lower layers of the ladle provides a more comprehensive reflection of the overall composition of the molten steel. Furthermore, several alloying elements are common in steel, namely C (carbon), Mn (manganese), and Si (silicon). The content and distribution of these elements have a significant impact on the properties of the steel. By detecting the content of these elements, the uniformity of the molten steel composition can be assessed.

[0085] S32: Perform a vacuum degassing operation on the ladle.

[0086] In this step, during the steelmaking process, the composition uniformity of the molten steel plays a key role in the quality and performance of the steel. If the various alloying elements in the molten steel are not evenly distributed, it will cause differences in the performance of different parts of the steel, affecting important performance indicators such as strength, toughness, corrosion resistance, etc., and even may cause quality problems. Therefore, ensuring the composition uniformity of the molten steel is an important goal in the steelmaking process. Vacuum stirring is a key operation that blows argon into the molten steel, using the upward floating of argon bubbles to drive the flow of molten steel, achieving stirring effect, which can effectively improve the quality of the molten steel. The ladle can be a vacuum degassing furnace (VD furnace), by pouring the molten steel into the VD furnace, to create a nearly perfect low-pressure environment for the molten steel. With the start of the device, the gas in the ladle is gradually removed, starting the vacuum degassing process of the molten steel. In this process, the dissolved hydrogen, nitrogen and other harmful gases in the molten steel, as well as part of the impurities, will gradually escape under the action of low pressure, making the molten steel purer.

[0087] S33: Obtain the operation time of the vacuum degassing of the ladle.

[0088] S34: When the operation time is in the first preset time period, blow argon into the ladle according to the first preset flow rate.

[0089] S35: When the operation time is in the second preset time period, blow argon into the ladle according to the second preset flow rate.

[0090] S36: When the operation time is in the third preset time period, blow argon into the ladle according to the third preset flow rate.

[0091] For steps S33-S36, during the vacuum stirring process, different argon flow rates are used for staged control in different stages, in order to achieve the best stirring effect in each stage, while avoiding the occurrence of some adverse situations, thereby optimizing the entire vacuum stirring process. Specifically, the operation time of the vacuum degassing of the ladle is recorded. When the operation time is in the first preset time period, argon is blown into the ladle at a first preset flow rate, smoothly and accurately. As time goes on, when the operation time enters the second preset time period, argon is blown into the ladle at a second preset flow rate, further optimizing the composition uniformity of the molten steel, so that various alloying elements are more evenly distributed in the molten steel. When the operation time reaches the third preset time period, argon is blown into the ladle at a third preset flow rate. At this time, the blowing of argon maintains the good fluidity and composition uniformity of the molten steel, ensuring that the molten steel reaches the expected purity and quality standards.

[0092] Optionally, a plurality of preset time periods are determined in advance based on metallurgical principles and production experience. Specifically, the first preset time period is the initial vacuumizing period, and the first preset time period is set to range from 0 minutes to 5 minutes; the second preset time period is the vacuum maintaining period, and the second preset time period is set to range from 5 minutes to 20 minutes; and the third preset time period is the soft blowing period, and the third preset time period is set to range from 20 minutes to 30 minutes. By pre-setting the plurality of time periods, the vacuum stirring is divided into a plurality of stages, and argon is controlled in stages to sufficiently remove gas and impurities and to uniformly distribute alloy elements.

[0093] In an actual application scenario, the initial vacuumizing period is the initial stage of starting the vacuumizing operation on the container containing the molten steel. In this stage, by drawing the steelmaking container into a vacuum environment, the pressure on the surface of the molten steel can be reduced, and the gas (such as hydrogen, nitrogen, etc.) in the molten steel can be caused to escape, and at the same time, the floating removal of some impurities is also beneficial. The vacuumizing time of 20 minutes is set to give the gas and impurities sufficient time to separate from the molten steel. During this period, in combination with the stirring operation, the gas and impurities can be accelerated to be discharged, and the purity of the molten steel can be improved. At this time, the argon flow rate is controlled to be 0.8 Nm3 / min-1.0 Nm3 / min, and the relatively large argon flow rate can produce a strong stirring effect. In the steelmaking process, the molten steel can have a composition segregation phenomenon, that is, the composition of the molten steel at different positions is different. The strong stirring formed by the relatively large argon flow rate can make the molten steel flow rapidly, break this composition segregation, and make the various elements in the molten steel more uniformly distributed, thereby laying a good foundation for the subsequent refining process. The time when the vacuum degree reaches the set requirement and remains stable is called the vacuum maintaining period. The argon flow rate is adjusted to 0.5 Nm3 / min-0.7 Nm3 / min, which is lower than that in the initial vacuumizing period. In this stage, the composition of the molten steel has been homogenized to a certain extent. At this time, the argon flow rate is appropriately reduced, which can not only maintain a certain stirring effect, but also enable the molten steel to have sufficient time for the alloy elements to diffuse in the molten steel. The uniform diffusion of the alloy elements helps to further accurately adjust the composition of the molten steel, so that the performance of the molten steel can meet the production requirements. Subsequently, the soft blowing period, that is, the last stage of the vacuum stirring, is entered, which is mainly used for fine-tuning the composition and uniformity of the molten steel, and further ensuring the uniformity of the composition of the molten steel. A lower argon flow rate is adopted, which is controlled to be 0.2 Nm3 / min-0.3 Nm3 / min. On the one hand, the small-flow argon can provide a weak stirring effect to finally fine-tune the uniformity of the molten steel, and ensure that the composition of the molten steel is highly uniform. On the other hand, the small argon flow rate can avoid the occurrence of violent fluctuations on the surface of the molten steel, thereby reducing the occurrence of the slag entrainment phenomenon. The slag entrainment phenomenon refers to the slag on the surface of the molten steel being entrained into the molten steel, which can affect the purity and quality of the molten steel, and therefore should be avoided as much as possible in the soft blowing period.

[0094] By the above-mentioned manner, the molten steel is vacuum degassed and the stirring time is controlled in stages, so that the various components in the molten steel are uniformly distributed, the chemical reaction is promoted, the impurities and gas in the molten steel are removed, and the quality and performance of the molten steel are improved.

[0095] In one embodiment of the present application, a specific vacuum stirring optimization scheme is provided, that is, when the operation time is in the third preset time period, after argon is blown into the ladle according to the third preset flow rate, the following steps are further included:

[0096] According to a plurality of preset intervals, a plurality of second contents of a plurality of alloying elements in the ladle are obtained;

[0097] Based on the plurality of first contents and the plurality of second contents, a plurality of range values of the plurality of alloying elements are determined;

[0098] If the range value of any alloying element is greater than a preset range threshold value, argon is blown into the ladle according to a fourth preset flow rate and a preset time until the range value is less than or equal to the preset range threshold value.

[0099] In this embodiment, in the steelmaking process, the uniformity of the composition of the molten steel is crucial to the quality and performance of the steel. Inhomogeneous composition can cause differences in mechanical properties and physical properties of different parts of the steel, thereby affecting the overall quality and performance of the steel. Therefore, by multi-point sampling and range detection, the uniformity of the composition of the molten steel can be effectively evaluated and controlled to ensure that the quality of the steel meets the requirements. Specifically, when the vacuum stirring is completed, samples are taken from the upper, middle and lower layers of the ladle according to a plurality of preset intervals to obtain the composition of the alloying elements in the molten steel in different intervals after VD treatment. The plurality of first content data obtained before VD treatment and the plurality of second content data measured after VD treatment are carefully compared and analyzed to determine the range value of the content of each alloying element, which reflects the dispersion degree of the distribution of the alloying elements in the molten steel. The calculated range value is strictly compared with the preset range threshold value. The preset range threshold value represents the qualified standard of the uniformity of the composition of the molten steel. If the range value is greater than the preset range threshold value, it indicates that the distribution of the alloying elements in the ladle is not uniform enough and has not yet reached the expected quality requirements. At this time, argon is accurately blown into the ladle according to the fourth preset flow rate and the preset time. With the continuous blowing of argon, the alloying elements in the molten steel will continuously redistribute and diffuse. Continuous monitoring and analysis are carried out until the range value is less than or equal to the preset range threshold value, which means that the distribution of the alloying elements in the ladle has reached a uniform and stable state, meeting the composition requirements for producing high-quality steel. At this time, the argon blowing operation will be stopped in time, and the molten steel refining process is completed, laying a solid foundation for subsequent production of steel with excellent performance.

[0100] In an actual application scenario, the VD treatment refers to placing the molten steel in a vacuum environment for degassing refining operation. By comparing the composition of the molten steel before and after the treatment, the influence of the VD treatment on the composition uniformity of the molten steel can be understood. Since the molten steel in the ladle can have a composition stratification phenomenon, the composition of the molten steel at different height positions can be different. Therefore, sampling from the upper, middle and lower layers of the ladle can more comprehensively reflect the composition of the whole molten steel. The range is the difference between the maximum value and the minimum value in a set of data. For each alloying element ([C], [Mn], [Si]), the difference between the maximum value and the minimum value of the content of the element in the six samples taken from different layers of the ladle is calculated to obtain the range of the element. The preset range threshold is set to 0.08%. If the range > 0.08%, it means that when the range of a certain element detected exceeds 0.08%, the uniformity of the composition of the molten steel is poor, which does not reach the acceptable range. At this time, the stirring time is prolonged by 5 minutes (i.e. the preset time) to improve the uniformity of the composition of the molten steel through further stirring. Then, multi-point sampling detection is performed again to determine whether the uniformity of the composition of the molten steel has been improved.

[0101] In the above manner, through multi-point sampling combined with range detection, the uniformity of the composition of the molten steel can be effectively evaluated and controlled to ensure that the quality of the steel meets the requirements.

[0102] S40: The molten steel is treated by a continuous casting process to obtain a deformed bar sample.

[0103] In this step, the molten steel after refining treatment is sent to the continuous casting link, and the molten steel is gradually solidified and formed in the continuous casting machine to finally obtain a deformed bar sample.

[0104] In an embodiment of the present application, a specific node detection scheme is provided, that is, before the molten steel in the converter is injected into the ladle, the following steps are further included:

[0105] Obtain a first error value of the carbon element and a second error value of the manganese element in the molten steel;

[0106] If the first error value is greater than the first preset error threshold and / or the second error value is greater than the second preset error threshold, the molten steel in the converter is subjected to a supplementary blowing treatment or an additional alloying treatment until the first error value is greater than the first preset error threshold and the second error value is greater than the second preset error threshold.

[0107] In this embodiment, in the steelmaking process, the chemical composition of the molten steel plays a decisive role in the quality and performance of the steel. Different steel products have specific requirements for the content of various elements (such as carbon, manganese, silicon, etc.). By detecting and monitoring the composition of the molten steel at key nodes, composition deviations can be detected in a timely manner, and appropriate compensation measures can be taken to ensure that the quality of the final steel meets the standards. Based on this, the present application proposes to detect the composition of the molten steel before the converter tapping, which can provide basic data for the subsequent refining and continuous casting process. Specifically, before the converter tapping, the actual content of the carbon element in the molten steel is obtained, and the first error value is calculated by the actual content and the target content. At the same time, the actual content of the manganese element in the molten steel is obtained, and the second error value is calculated by the actual content and the target content. The first error value is compared with the first preset error threshold set in advance, and the second error value is also compared with the second preset error threshold. The two preset error thresholds are determined based on a large number of experiments and rich practical experience, and represent the acceptable error range of the content of carbon and manganese elements in the molten steel. If the first error value is greater than the first preset error threshold, or the second error value is greater than the second preset error threshold, it indicates that the content of carbon and manganese elements in the molten steel deviates from the expected target, which may adversely affect the final performance of the steel. At this time, according to the specific error situation and the actual state of the molten steel, the molten steel in the converter is selected for reblowing treatment or alloy addition treatment. Specifically, the reblowing treatment is to adjust the chemical reaction in the molten steel by blowing oxygen into the converter, thereby changing the content of the carbon element. The alloy addition treatment is to add an appropriate amount of alloy to the molten steel to adjust the content of manganese and other elements.

[0108] In actual application scenarios, before the converter tapping, the content of the carbon element and the content of the manganese element in the molten steel are accurately obtained by the sub-lance. The allowable fluctuation range of the carbon element is ±0.03%, and the allowable fluctuation range of the manganese element is ±0.10%. That is, the actual detected carbon and manganese content fluctuates within a certain range above and below the preset error threshold, which is acceptable. If the content deviation of carbon or manganese exceeds the allowable fluctuation range, oxygen is continuously blown into the converter to reduce the carbon content in the molten steel through oxidation reaction, or an appropriate amount of alloy element is added to the converter according to the composition deviation to adjust the composition of the molten steel.

[0109] In one embodiment of the present application, a specific node detection scheme is provided, that is, before vacuum degassing of the ladle, the following steps are further included:

[0110] Obtaining a third error value of the silicon element and a fourth error value of the manganese element in the preset sampling area of the ladle;

[0111] If the third error value is greater than the third preset error threshold and / or the fourth error value is greater than the fourth preset error threshold, the molten steel in the ladle is subjected to alloying treatment until the third error value is greater than the third preset error threshold and the fourth error value is greater than the fourth preset error threshold.

[0112] In this embodiment, before VD treatment, the actual content of silicon element and the actual content of manganese element in the molten steel in the top region (i.e. the preset region) of the ladle are obtained, the third error value is calculated by the actual content of silicon element and the target content, and the fourth error value is calculated by the actual content of manganese element and the target content. The third error value is compared with the third preset error threshold set in advance, and the fourth error value is also compared with the fourth preset error threshold. These preset error thresholds are determined through a large number of experiments and practical verification, and represent the acceptable reasonable error range of the content of silicon and manganese elements in the molten steel. If the detection finds that the third error value is greater than the third preset error threshold and / or the fourth error value is greater than the fourth preset error threshold, it indicates that the content of silicon and manganese elements in the molten steel in the top region of the ladle fails to reach the expected standard, which may have adverse effects on the performance of the final steel product. At this time, the molten steel in the ladle is subjected to alloying treatment, i.e. the appropriate amount of silicon and manganese alloy is accurately calculated and added according to the error condition and the specific state of the molten steel. After the alloy is added, the dynamic changes of the third error value and the fourth error value are continuously monitored. Only when the third error value is less than or equal to the third preset error threshold and the fourth error value is also less than or equal to the fourth preset error threshold, it means that the content of silicon and manganese elements in the molten steel in the preset sampling region of the ladle has been successfully adjusted to the target range, reaching the composition requirement needed for producing high-quality steel products. At this time, the alloying treatment operation will stop.

[0113] In actual application scenarios, VD (Vacuum Degassing) treatment is a refining link in the steelmaking process. The detection of the composition of the molten steel before VD treatment can provide accurate parameters for VD treatment and ensure the treatment effect. The molten steel sample is obtained by sampling from the top of the ladle, and then the composition analysis is performed. The actual content of silicon element and manganese element is obtained. The allowable fluctuation range of silicon element is ±0.05%, and the allowable fluctuation range of manganese element is ±0.08%. When the deviation of silicon or manganese exceeds the allowable fluctuation range, the alloying treatment is adopted to compensate. When the alloy is added, the addition amount of the alloy is calculated according to the recovery rate of 80%, so as to avoid further expansion of the composition deviation.

[0114] In the embodiments of the present application, the composition detection is performed before the molten steel is treated by the continuous casting process, so as to ensure that the composition of the molten steel entering the continuous casting machine meets the requirements and guarantees the quality of the casting blank. Specifically, the rapid spectrometer is used for detection, and the detection is required to be completed within 2 minutes. The rapid spectrometer can quickly and accurately analyze the content of carbon and manganese elements in the molten steel. The allowable fluctuation range of the carbon element is ±0.05%, and the allowable fluctuation range of the manganese element is ±0.15%. Before continuous casting, the content of carbon and manganese elements is still strictly controlled to ensure the quality and performance of the casting blank. If the deviation of the carbon element or the manganese element exceeds the allowable fluctuation range, according to the severity of the over-standard situation, the measures of changing the steel grade or returning to the furnace are taken. That is, the originally planned steel grade is adjusted to other steel grades with relatively loose composition requirements, or the molten steel is sent back to the steelmaking furnace for re-refining to adjust the composition to meet the requirements.

[0115] In the above manner, with a series of accurate composition quantitative control means, fine control of the composition of deformed steel bars can be achieved. Taking manganese element as an example, the fluctuation range of the composition of manganese element in the deformed steel bar is originally ±0.15%, and after the above quantitative control measures are strictly implemented, the fluctuation range is significantly reduced to ±0.08%. This effective control of the composition fluctuation not only improves the quality stability of the deformed steel bar, but also brings significant cost saving benefits. The product quality is guaranteed, the production cost of the enterprise is reduced, and the market competitiveness is enhanced.

[0116] As can be seen in the above scheme, the molten iron and scrap steel are loaded into the converter in proportion for blowing, and after the process parameters of the molten steel reach the preset tapping standard, the molten steel is injected into the ladle for vacuum degassing treatment. In this process, the molten steel is stirred by blowing argon to effectively remove gas impurities in the molten steel, significantly improving the purity of the molten steel. The molten steel after vacuum degassing treatment enters the continuous casting link immediately, and after cooling and solidification, the final deformed steel bar product is formed. This process eliminates the traditional LF furnace treatment link and directly uses the VD furnace for refining. The VD furnace can efficiently complete the key processes of molten steel degassing and impurity removal in a vacuum environment, and by accurately controlling the temperature, pressure, treatment time and alloy addition amount, etc., the composition of the molten steel is accurately controlled. Compared with the traditional process, this smelting method of omitting the LF furnace and directly using the VD furnace avoids the composition fluctuation caused by the LF furnace, ensures the high stability of the composition of the molten steel, and simplifies the process flow, which not only improves the consistency of the quality and performance of the steel, but also reduces the production cost and improves the production efficiency.

[0117] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A method for smelting rebar, characterized in that, include: After molten iron and scrap steel are mixed in a preset ratio and loaded into a converter, oxygen is blown into the converter to obtain molten steel. The process parameters of the molten steel in the converter are obtained. When the process parameters meet the preset tapping standards, the molten steel in the converter is injected into the ladle. The ladle is subjected to vacuum degassing, and argon gas is blown into the ladle to stir the molten steel. The molten steel was processed using a continuous casting process to obtain a rebar sample.

2. The method according to claim 1, characterized in that, The step of obtaining the process parameters of the molten steel in the converter, and injecting the molten steel in the converter into the ladle when the process parameters meet the preset tapping standards, specifically includes: The process parameters of the molten steel in the converter are obtained, wherein the process parameters include at least one of the following: molten steel temperature, carbon content in the molten steel and oxygen activity; When the temperature of the molten steel reaches a preset temperature threshold, the carbon content reaches a first preset content threshold, and the oxygen activity value reaches a preset activity threshold, it is determined that the molten steel meets the preset tapping standard, oxygen is stopped being blown into the converter, and the molten steel in the converter is injected into the ladle.

3. The method according to claim 1, characterized in that, Also includes: During the process of blowing oxygen into the converter, the carbon content fluctuation value is determined based on the carbon content in the molten steel and the target carbon content. The oxygen blowing time is adjusted based on the carbon content fluctuation value, the preset fluctuation threshold, the carbon content value, and the preset range.

4. The method according to claim 2, characterized in that, The process of obtaining the process parameters of the molten steel in the converter, and before injecting the molten steel in the converter into the ladle when the process parameters meet the preset tapping standards, further includes: Obtain the carbon monoxide and carbon dioxide content in the converter; The ratio of carbon monoxide to carbon dioxide in the converter is determined based on the carbon monoxide content and the carbon dioxide content. Based on the aforementioned ratio, the predicted manganese and phosphorus content in the molten steel during converter tapping is determined. Based on the predicted manganese content and the target manganese content, the first deviation value of manganese is determined; Based on the predicted phosphorus content and the target phosphorus content, a second deviation value for phosphorus is determined; If the first deviation value is greater than the first preset deviation threshold and / or the second deviation value is greater than the second preset threshold, an alloy addition operation is performed on the molten steel in the converter; If the first deviation value is less than or equal to the first preset deviation threshold, and the second deviation value is less than or equal to the second preset deviation threshold, no alloy addition operation is required, and the molten steel in the converter is injected into the ladle.

5. The method according to claim 4, characterized in that, The step of adding alloys to the molten steel in the converter if the first deviation value is greater than a first preset deviation threshold and / or the second deviation value is greater than a second preset threshold specifically includes: When the first deviation value is greater than the first preset deviation threshold, the alloying element of the first added alloy is determined based on the manganese element; Based on the predicted manganese content, the target manganese content, the weight of molten steel, the manganese burn-off, and the manganese recovery rate, the first addition amount of the first additive alloy is determined. The first additive alloy is added to the molten steel according to the first addition amount; When the second deviation value is greater than the second preset deviation threshold, the alloying element of the second added alloy is determined based on the phosphorus element; Based on the predicted phosphorus content, the target phosphorus content, the weight of molten steel, the phosphorus burn-off amount, and the phosphorus recovery rate, the second addition amount of the second additive alloy is determined. The second additive alloy is added to the molten steel according to the second addition amount.

6. The method according to claim 4, characterized in that, The step of injecting molten steel from the converter into the ladle if the first deviation value is less than or equal to the first preset deviation threshold and the second deviation value is less than or equal to the second preset deviation threshold, without the need for alloy addition, specifically includes: Based on the alloying elements in molten steel, the alloying elements of the third added alloy were determined; Obtain the weight of molten steel, the alloy content in the molten steel, the target alloy content, the alloy loss due to burn-off, and the alloy yield; The third addition amount of the third alloy is determined based on the weight of the molten steel, the alloy content in the molten steel, the target alloy content, the alloy burn-off amount, and the alloy yield. Based on a preset ratio, the third addition amount is divided into a first target addition amount and a second target addition amount; The molten steel in the converter is poured into the ladle; During the process of pouring molten steel into the ladle, the remaining amount of molten steel in the converter is obtained; When the remaining amount reaches the first preset remaining threshold, the third additive alloy of the first target addition amount is added to the ladle; When the remaining amount reaches the second preset remaining threshold, the third additive alloy of the second target addition amount is added to the ladle.

7. The method according to claim 1, characterized in that, The steps of performing vacuum degassing on the ladle and blowing argon gas into the ladle to stir the molten steel specifically include: According to multiple preset intervals, the first contents of multiple alloying elements in the ladle are obtained; The ladle is subjected to vacuum degassing. The operation time for vacuum degassing of the ladle was obtained; When the operation time is within a first preset time period, argon gas is blown into the ladle according to a first preset flow rate. When the operation time is within the second preset time period, argon gas is introduced into the ladle according to the second preset flow rate. When the operation time is within the third preset time period, argon gas is blown into the ladle according to the third preset flow rate.

8. The method according to claim 7, characterized in that, When the operation time is within a third preset time period, after blowing argon gas into the ladle according to a third preset flow rate, the method further includes: According to the multiple preset intervals, multiple second contents of multiple alloying elements in the ladle are obtained; Based on the plurality of first contents and the plurality of second contents, a plurality of range values ​​for the plurality of alloying elements are determined; If the range value of any alloying element is greater than the preset range threshold, argon gas is blown into the ladle according to the third preset flow rate and preset time until the range value is less than or equal to the preset range threshold.

9. The method according to claim 1, characterized in that, Before injecting the molten steel from the converter into the ladle, the process further includes: Obtain the first error value of carbon and the second error value of manganese in the molten steel; If the first error value is greater than the first preset error threshold and / or the second error value is greater than the second preset error threshold, the molten steel in the converter is subjected to supplementary blowing or alloying treatment until the first error value is greater than the first preset error threshold and the second error value is greater than the second preset error threshold.

10. The method according to claim 7, characterized in that, Before performing vacuum degassing on the ladle, the procedure further includes: Obtain the third error value of silicon and the fourth error value of manganese in the preset sampling area inside the ladle; If the third error value is greater than the third preset error threshold and / or the fourth error value is greater than the fourth preset error threshold, the molten steel in the ladle is subjected to additional alloying treatment until the third error value is greater than the third preset error threshold and the fourth error value is greater than the fourth preset error threshold.

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