A method and system for low-cost control of alloy addition during tapping of aluminum-killed steel converters

Abstract

The present invention provides a method and system for low-cost control of alloy addition during tapping in a converter for aluminum-killed steel, belonging to the technical field of steelmaking. Specifically, a database is established for information such as heat number, steel grade, scrap weight, hot metal weight, number of times the tapping hole is used, converter end-point oxygen content, and composition measurement. According to the steel grade composition control target, alloy price, and alloy composition, the addition amount of the alloy is calculated, and the real-time data of the converter and the calculation results are stored in the database. The statistical regression formula for alloy recovery rate is updated. At the same time, the content of P in the molten steel when it arrives at the refining station is read into the database to verify the calculation of the converter slag carry-over amount. The system includes a client, a batching server, and a memory. The present invention can perform rapid and accurate batching according to the composition of the current molten steel, reducing the cost of steelmaking alloys.

Description

Technical Field

[0001] The present invention relates to a method and system for low-cost control of alloy addition during tapping from a converter for aluminum-killed steel, belonging to the technical field of steelmaking. Background Art

[0002] During the steelmaking production process, various alloys are added to the molten steel for deoxidation and alloying to meet the physical and chemical property requirements of different steel grades, and the content of each element is adjusted to the process-specified range. The alloy cost accounts for a relatively large proportion of the steel smelting cost. If the alloy type and addition amount can be reasonably selected to minimize the alloy cost on the premise of meeting the production requirements, it is crucial for controlling production costs and improving efficiency.

[0003] During the tapping process of the converter, due to the impact of the molten steel flow, good kinetic conditions are provided, and adding alloys during this process is beneficial for the rapid melting of the alloys, which is a good opportunity for alloy feeding. Currently, in the steelmaking production process, the selection of alloy types and the added weight of alloys are relatively fixed based on the converter end-point conditions and the target control composition. The disadvantage of this alloy addition method is that it is not conducive to cost control. However, it is difficult to achieve precise batching according to the molten steel conditions during the smelting process, mainly because: from the time when the composition detection results come out to tapping, the time is short, and considering factors such as alloy types, prices, compositions, and deoxidation and alloying effects simultaneously, it is almost impossible to achieve by manual empirical calculation. Therefore, if a method for low-cost control of alloys in aluminum-killed steelmaking can be developed to guide operators to quickly read relevant information within a few minutes before tapping from the converter and complete the optimal batching calculation that meets the process requirements, it is of great significance for reducing the alloy cost in steelmaking and improving production efficiency.

[0004] Chinese invention patent CN114611844B discloses a method and system for determining the alloy addition amount during the tapping process of a converter. This patent application calculates the alloy element recovery rate through a neural network and uses integer linear programming to solve the alloy addition amount. This invention uses a neural network to predict the alloy recovery rate, but the neural network calculation is complex, and when the settings are inappropriate, data divergence may occur, resulting in the problem of inability to calculate.

[0005] Chinese invention patent application CN116665791A discloses a low-cost alloy calculation method for converters applicable to all steel grades. This patent application first calculates the alloy corresponding to a single component according to the alloy composition and price, and for the remaining components in the molten steel composition that have not reached the target brought by this alloy, other alloys are continued to be calculated until all alloys are calculated. The alloy types and alloy weights calculated by this method may not be optimal.

[0006] It can be seen that there are still no relatively stable paths and methods for controlling alloy costs in the market. This field is still in a relatively blank stage, and the industry still uses experience in production, which is not conducive to cost management and control, nor to the reasonable, scientific, and quantitative use of additives. Summary of the Invention

[0007] In view of the deficiencies of the above technical methods, in order to solve the above problems, the purpose of the present invention is to provide a method and system for low-cost control of alloy during tapping from a converter for aluminum-killed steel, which overcomes the possible non-convergence of the neural network during the calculation of alloy recovery rate and can quickly and accurately optimize the batching according to the composition of the current molten steel. The specific technical solutions are as follows:

[0008] A method for low-cost control of alloy during tapping from a converter for aluminum-killed steel, comprising the following steps:

[0009] Step (1): Collect real-time data during the production process of the converter and establish a database;

[0010] Step (2): Limit the range of hot metal charge and scrap charge, and stabilize the tapping volume of the converter;

[0011] Step (3): According to the steel grade to be smelted and the target carbon content of the steel grade, read the parameters of the converter end-point oxygen content and the number of times the tapping hole is used, and determine the calculation formula for the alloy element recovery rate;

[0012] Step (4): Limit the tapping angle between -104 °C and -100 °C, control the slag volume of the converter, and reduce the influence of the slag volume fluctuation of the converter on the alloy recovery rate;

[0013] Step (5): Establish a model for solving the alloy addition amount by using an improved linear programming solution method. The model for solving the alloy addition amount takes the lowest total cost Z of alloy addition as the objective function:

[0014] ,

[0015] In the formula: is the price of alloy j, is the addition amount of alloy j, and n is the type of alloy;

[0016] The constraint conditions are as follows:

[0017] ;

[0018] Among them, is the lower limit of the composition of element i, %; represents the content of element i in alloy j, %; is the added weight of alloy j, kg; is the weight of element i in the molten steel during tapping from the converter, kg; The upper limit of the composition of element i, %; i is an alloying element; The weight of element i reduced in the slag from the converter, kg;

[0019] The alloy addition amount is less than the maximum value of the weight of the alloy that can be added:

[0020] ,

[0021] Among them, is the maximum addition amount of the jth alloy in the actual production of this steel grade. The maximum addition amounts of different alloys for different steel grades are determined according to the process production requirements and stored in the database;

[0022] Step (6) After the converter tapping is completed, store the furnace number and the alloy addition amount result in the real-time database.

[0023] Furthermore, the real-time data in the converter production process in step (1) includes: furnace number, steel grade, hot metal charge, scrap addition amount, number of times the tapping hole is used, tapping time, converter end point composition, converter end point temperature, converter end point oxygen content, tapping amount, converter slag amount, converter end point slag composition, addition amounts of various alloys during the tapping process, ladle steel liquid composition after alloying, alloy composition, alloy price, target steel liquid composition, and alloying element recovery rate.

[0024] Furthermore, the calculation process of the converter tapping amount in step (2) is as follows: control the range of the hot metal charge in the converter between 159 and 162 t, and calculate the hot metal recovery rate according to the empirical value of 0.89; control the range of the scrap charge in the converter between 46 and 48 t, and calculate the scrap recovery rate according to the empirical value of 0.80.

[0025] Furthermore, the alloying element recovery rates in step (3) are as follows:

[0026] The recovery rate of aluminum The calculation process is:

[0027] When the number of times the tapping hole is used is less than or equal to 100, the calculation formula is:

[0028] ,

[0029] When the number of times the tapping hole is used is greater than 100, the calculation formula is:

[0030] ,

[0031] Among them, is the aluminum addition amount, kg; is the converter end point oxygen content, ppm; is the number of times the tapping hole is used;

[0032] The recovery rate of manganese The calculation formula is:

[0033] ,

[0034] where, is the addition amount of manganese, kg;

[0035] The calculation process of the silicon recovery rate is:

[0036] When the number of times the tapping hole is used is less than or equal to 100, the calculation formula is:

[0037] ,

[0038] When the number of times the tapping hole is used is greater than 100, the calculation formula is:

[0039] ,

[0040] where, is the addition amount of silicon, kg;

[0041] The recovery rate of P element brought in by the alloy is calculated according to 100%.

[0042] Furthermore, the influence of the slag volume of the converter in step (4) on the Si and Mn element contents in the alloy batching process is that when producing aluminum-killed steel in the converter, due to the strong deoxidation of the molten steel by adding aluminum blocks during the tapping process, the Si and Mn elements in the slag are reduced into the molten steel, resulting in an impact on the alloy batching by the slag volume of the converter;

[0043] ,

[0044] where, is any one of Si and Mn elements in the molten steel, %; is the i element weight in the molten steel during converter tapping, kg; is the i element weight in the added alloy, kg; is i element alloy recovery rate, %; is the molten steel weight, kg;

[0045] ,

[0046] ,

[0047] where, is the Si weight in the converter slag, kg; is the mass content of SiO2 in the converter slag, %; is the Mn weight in the converter slag, kg; is the mass content of MnO in the converter slag, %; is the amount of slag tapped from the converter, kg;

[0048] The calculation formula for the amount of slag tapped from the converter is as follows:

[0049] ,

[0050] wherein, is the mass content in the converter slag, %;

[0051] The calculation of the phosphorus amount brought in by the slag tapped from the converter is as follows:

[0052] ,

[0053] wherein, is the weight in the slag tapped from the converter, kg; is the oxygen content at the end of the converter blow, ppm; is the slag tapping time, s.

[0054] Furthermore, the alloy composition and alloy price in the real-time database are updated according to the alloy warehousing batches.

[0055] The present invention also claims protection for a system for implementing the low-cost control method for alloy addition during the tapping of killed steel in a converter, including a client, a batching server, and a memory. The client obtains the furnace number, steel grade, scrap weight, hot metal weight, number of times the tapping hole is used, oxygen content at the end of the converter blow, composition measurement information, steel grade composition control target, alloy price, and alloy composition. The batching server completes the alloy batching calculation according to the steel grade composition control target, alloy price, and alloy composition, stores the real-time data of the converter and the calculation results in the database, updates the statistical regression formula for alloy yield, and at the same time reads the content of P in the molten steel when it arrives at the refining station into the database to verify the calculation of the amount of slag tapped from the converter. The database and the calculation formula are stored in the memory.

[0056] The beneficial effects of the present invention are as follows:

[0057] The present invention can perform rapid and accurate batching according to the composition of the current molten steel;

[0058] After the chemical composition detection result of the molten steel at the end of the converter blow comes out, the client loads the furnace number, steel grade, molten steel weight, chemical composition of the molten steel at the end of the converter blow, and the steel grade composition control target corresponding to this furnace, clicks the batching calculation button, and starts the batching server to quickly and accurately calculate the addition amount of each alloy, optimize the batching, and improve production efficiency.

[0059] The present invention selects the alloy yield calculation formula according to the converter operation conditions, and the calculation result of the alloy addition amount is more scientific and accurate;

[0060] Select the calculation formula for alloy recovery rate according to the converter operation conditions. In addition, as the number of uses of the converter tapping hole increases, the slag blocking effect of the slag blocking cone gradually deteriorates. By using the big data analysis method, predict the slag volume of this converter and store it in the database. Considering the influence of the converter slag volume on alloy batching helps to improve the accuracy of the recovery rates of Si, Mn, and P elements. Brief Description of the Drawings

[0061] Figure 1 It is a schematic diagram of the control flow of the present invention. Detailed Embodiments

[0062] The present invention is further illustrated by the following embodiments: According to the following embodiments, the present invention can be better understood. However, those skilled in the art can easily understand that the specific materials, process conditions, and their results described in the embodiments are only used to illustrate the present invention and should not and will not limit the present invention described in detail in the claims.

[0063] The method for low-cost control of alloy during tapping of converter for aluminum-killed steel of the present invention, in combination with the attached Figure 1 , includes the following steps:

[0064] Step (1): Collect the real-time data of the converter production process and establish a database. The real-time data of the converter production process includes: furnace number, steel grade, hot metal charge, scrap addition, number of times the tapping hole is used, tapping time, converter end-point composition, converter end-point temperature, converter end-point oxygen content, tapping volume, converter slag volume, converter end-point slag composition, addition amount of each alloy during tapping, composition of the molten steel in the ladle after alloying, alloy composition, alloy price, target composition of the molten steel, and alloy element recovery rate.

[0065] Step (2): Limit the ranges of hot metal charge and scrap charge to stabilize the converter tapping volume. The calculation process of the converter tapping volume is as follows: Control the range of converter hot metal charge between 159 and 162 t, and calculate the hot metal recovery rate according to the empirical value of 0.89; control the range of converter scrap charge between 46 and 48 t, and calculate the scrap recovery rate according to the empirical value of 0.80.

[0066] Step (3): According to the steel grade to be smelted and the target carbon content of the steel grade, read the parameters of the converter end-point oxygen content and the number of times the tapping hole is used, and determine the calculation formula for the alloy element recovery rate.

[0067] The alloy element recovery rates are as follows:

[0068] Aluminum recovery rate The calculation process is as follows:

[0069] When the number of times the tapping hole is used is less than or equal to 100, the calculation formula is:

[0070] ,

[0071] When the number of uses of the tapping hole is greater than 100, the calculation formula is:

[0072] ,

[0073] Wherein, is the aluminum addition amount, kg; is the oxygen content at the end of the converter blowing, ppm; is the number of uses of the tapping hole;

[0074] Manganese recovery rate The calculation formula is:

[0075] ,

[0076] Wherein, is the manganese addition amount, kg;

[0077] The calculation process of silicon recovery rate is:

[0078] When the number of uses of the tapping hole is less than or equal to 100, the calculation formula is:

[0079] ,

[0080] When the number of uses of the tapping hole is greater than 100, the calculation formula is:

[0081] ,

[0082] Wherein, is the silicon addition amount, kg;

[0083] The recovery rate of P element brought in by the alloy is calculated according to 100%.

[0084] Step (4) limits the tapping angle to be between -104~-100 °C, controls the amount of slag tapped from the converter, and reduces the influence of the fluctuation of the amount of slag tapped from the converter on the alloy recovery rate. The influence of the amount of slag tapped from the converter on the Si and Mn element contents in the alloy batching process is that when producing aluminum-killed steel in the converter, due to the strong deoxidation of the molten steel by adding aluminum blocks during the tapping process, the Si and Mn elements in the slag are reduced into the molten steel, resulting in an impact on the alloy batching by the amount of slag tapped from the converter;

[0085] ,

[0086] Wherein, is any one of Si and Mn elements in the molten steel, %; is the i element weight in the molten steel during converter tapping, kg; is the i element weight in the added alloy, kg; is i element alloy yield, %; is the weight of molten steel, kg;

[0087] ,

[0088] ,

[0089] Among them, is the weight of Si in the converter's submerged slag, kg; is the mass content of SiO2 in the converter slag, %; is the weight of Mn in the converter's submerged slag, kg; is the mass content of MnO in the converter slag, %; is the amount of converter's submerged slag, kg;

[0090] The calculation formula for the amount of converter's submerged slag is as follows:

[0091] ,

[0092] Among them, is the mass content of in the converter slag, %;

[0093] The calculation of the phosphorus amount brought in by the converter's submerged slag is as follows:

[0094] ,

[0095] Among them, is the weight in the converter's submerged slag, kg; is the oxygen content at the end of the converter, ppm; is the submerged slag time, s.

[0096] In step (5), an alloy addition amount solution model is established by using an improved linear programming solution method. The alloy addition amount solution model takes the minimum total alloy addition cost Z as the objective function:

[0097] ,

[0098] In the formula: is the price of alloy j, is the addition amount of alloy j, and n is the type of alloy;

[0099] The constraint conditions are as follows:

[0100] ;

[0101] Among them, is the lower limit of the composition of element i, %; represents the content of element i in alloy j, %; is the weight of alloy j added, kg; is the weight of element i in the molten steel when tapping from the converter, kg; is the upper limit of the composition of element i, %; i is an alloying element; is the weight of element i reduced in the slag tapped from the converter, kg;

[0102] The alloy addition amount is less than the maximum value of the allowable alloy weight:

[0103] ,

[0104] wherein, is the maximum addition amount of the j-th alloy for this steel grade in actual production. The maximum addition amounts of different alloys for different steel grades are determined according to the process production requirements and stored in the database;

[0105] Step (6) After the converter tapping is completed, store the furnace number and the alloy addition amount result in the real-time database.

[0106] Step (6) After the converter tapping is completed, store the furnace number and the alloy addition amount result in the real-time database. The alloy composition and alloy price in the real-time database are updated according to the alloy storage batches.

[0107] The following takes the production of X65 series steel grades by the applicant's steel plant and adding ferro-manganese, ferrosilicon, and aluminum block alloys during the converter tapping process to meet the requirements of the finished steel element content as an example to demonstrate the application of the present invention application in actual production. The controlled composition of the X65 series steel plant is shown in the following table. In the actual production process, the alloy addition amount is estimated by the furnace foreman based on experience, and the alloy types selected are relatively fixed. Since the phosphorus content of this steel grade is <0.0189%, when the phosphorus content in the molten steel at the end of the converter is low, alloys with lower prices can be selected to replace high-price alloys.

[0108] Table 1 Controlled finished product composition of X65 series steel grades, %

[0109]

[0110] According to the loading situation of the converter alloy bin, the selectable alloy types, alloy compositions, and prices are shown in Table 2.

[0111] Table 2 Alloy prices, yuan / kg

[0112]

[0113] Table 3 Alloy compositions, wt%

[0114]

[0115] Taking the minimum total alloy addition cost as the objective function:

[0116]

[0117] Simultaneously satisfy the following constraint conditions:

[0118]

[0119] Among them, the upper and lower limits of the chemical components are shown in Table 1.

[0120] The recovery rates of Si, Mn, and Al elements are predicted according to the steel grade and the oxygen content of the current heat, and the recovery rates of C, P, S, and Cr elements are calculated with 100%.

[0121] Example 1

[0122] The hot metal charge is 165.0 t, the scrap charge is 39.3 t, the oxygen content at the end of the converter is 0.0577%, the C at the end of the converter: 0.04%, Si: 0.0001%, Mn: 0.084%, P: 0.0122%, S: 0.0051%, Cr: 0.018%, Al: 0.0%, the number of times the tapping hole is used is 85 times, the tapping time is 4.43 min, the recovery rates of alloying elements and the slag volume at the bottom of the converter are read from the database. 1227 kg of silicomanganese, 1510 kg of ferromanganese, 370 kg of aluminum ingots, 800.35 kg of medium-carbon ferromanganese, and 273.15 kg of low-carbon ferrochromium are added during tapping from the converter. The steel liquid composition is C: 0.0677%, Si: 0.145%, Mn: 1.5795%, P: 0.0144%, S: 0.0023%, Cr: 0.122%, Al: 0.0305%. The steel liquid composition meets the process requirements. Compared with the original process, the new process reduces the cost per ton of steel by 7.2 yuan / ton.

[0123] Example 2

[0124] The hot metal charge is 160.0 t, the scrap charge is 39.5 t, the oxygen content at the end of the converter is 0.0612%, the C at the end of the converter: 0.021%, Si: 0.0031%, Mn: 0.0971%, P: 0.0121%, S: 0.0076%, Cr: 0.022%, Al: 0.0%, the number of times the tapping hole is used is 162 times, the tapping time is 3.93 min, the recovery rates of alloying elements and the slag volume at the bottom of the converter are read from the database. 1315 kg of silicomanganese, 1514 kg of ferromanganese, 394 kg of aluminum ingots, 649.3 kg of medium-carbon ferromanganese, and 301.51 kg of low-carbon ferrochromium are added during tapping from the converter. The steel liquid composition is C: 0.078%, Si: 0.151%, Mn: 1.5784%, P: 0.0154%, S: 0.0016%, Cr: 0.13%, Al: 0.0303%. The steel liquid composition meets the process requirements. Compared with the original process, the new process reduces the cost per ton of steel by 8.0 yuan / ton.

[0125] Example 3

[0126] The hot metal charge is 165.12 t, the scrap charge is 40.0 t, the oxygen content at the end of the converter is 0.0526%, the C at the end of the converter is 0.042%, Si is 0.0001%, Mn is 0.0804%, P is 0.0107%, S is 0.0058%, Cr is 0.019%, Al is 0.0%, the number of times the tapping hole is used is 172 times, the tapping time is 3.57 min, the recovery rate of alloying elements and the slag volume under the converter are read from the database. 1023 kg of silicomanganese, 1513 kg of ferromanganese and 355 kg of aluminum ingots are added during tapping. The chemical composition of the molten steel is C: 0.0786%, Si: 0.142%, Mn: 1.5709%, P: 0.013%, S: 0.0016%, Cr: 0.118%, Al: 0.0287%. The chemical composition of the molten steel meets the process requirements. Compared with the original process, the cost per ton of steel of the new process is reduced by 11.2 yuan / ton.

[0127] Enlightened by the above ideal embodiments based on the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A method for low-cost control of alloy during tapping from a converter for aluminum-killed steel, characterized in that, It includes the following steps: Step (1): Collect the real-time data of the converter production process and establish a database; Step (2): Limit the range of hot metal charge and scrap charge, and stabilize the tapping volume of the converter; Step (3): According to the steel grade to be smelted and the target carbon content of the steel grade, read the parameters of the converter end-point oxygen content and the number of times the tapping hole is used, and determine the calculation formula for the alloy element recovery rate; The alloy element recovery rates are as follows: Aluminum recovery rate η Al The calculation process is as follows: When the number of times the tapping hole is used is less than or equal to 100, the calculation formula is: η Al = 34.82 - 0.03883 * W Al - 0.00124 * ω[O] - 0.02186 * m count When the number of times the tapping hole is used is greater than 100, the calculation formula is: η Al = 37.35 - 0.04839 * W Al - 0.00537 * ω[O] + 0.0132 * m count Among them, W Al is the aluminum addition amount, kg; ω[O] is the oxygen content at the end of the converter blowing, ppm; m count is the number of times the tapping hole is used; Manganese recovery rate η Mn The calculation formula is as follows: η Mn = 196.8710 - 0.03405 * W Mn - 0.00039 * m count Among them, W Mn is the addition amount of manganese, kg; The calculation process of the silicon recovery rate is: When the number of times the tapping hole is used is less than or equal to 100, the calculation formula is: η Si = 176.6781 - 0.2240*W Si + 0.0012*W Al + 0.0346*m count When the number of times the tapping hole is used is greater than 100, the calculation formula is: η Si = 189.1593 - 0.2638 * W Si + 0.0016 * W Al + 0.0176 * m count Among them, W Si is the silicon addition amount, kg; The recovery rate of P element brought in by the alloy is calculated according to 100%; Step (4): Limit the tapping angle between -104 and -100 °C, control the converter slag volume, and reduce the influence of the converter slag volume fluctuation on the alloy recovery rate; The influence of the converter slag volume on the contents of Si and Mn elements in the alloy batching process is as follows: When producing aluminum-killed steel in the converter, due to the strong deoxidation of the molten steel by adding aluminum blocks during tapping, the Si and Mn elements in the slag are reduced into the molten steel, resulting in the influence of the converter slag volume on the alloy batching; Among them, ω[i] is the content of either Si or Mn element in the molten steel, %; W TSO-i is the weight of element i in the molten steel when tapping from the converter, kg; W 合金-i is the weight of element i in the added alloy, kg; η i is the recovery rate of the i-element alloy, %; W is the weight of the molten steel, kg; Among them, W 转炉下渣-Si is the weight of Si in the slag from the converter, kg; is the mass content of SiO2 in the converter slag, %; W 转炉下渣-Mn is the weight of Mn in the slag from the converter, kg; ω MnO is the mass content of MnO in the converter slag, %; W 转炉下渣 is the amount of slag from the converter, kg. The calculation formula of the converter slag volume is as follows: Wherein, is the mass content of P2O5 in the converter slag, %; The calculation of the phosphorus amount brought in by the converter slag is as follows: W 转炉下渣-P = 23.4 - 0.0218 × ω[O] - 0.994 × t 下渣时间 Among them, W 转炉下渣-P is the weight of P in the slag tapped from the converter, kg; ω[O] is the oxygen content at the end of the converter blowing, ppm; t 下渣时间 is the slag tapping time, s; Step (5): Establish an alloy addition amount solving model by using an improved linear programming solving method. The alloy addition amount solving model takes the minimum total alloy addition cost Z as the objective function: where: C j is the price of alloy j, x j is the addition amount of alloy j, and n is the type of alloy; The constraint conditions are as follows: Among them, y lowi is the lower limit of the composition of element i, %; a ij represents the content of element i in alloy j, %; x j is the added weight of alloy j, kg; W steeli is the weight of element i in the molten steel when tapping from the converter, kg; y highi is the upper limit of the composition of element i, %; i is an alloying element; W 转炉下渣-i is the weight of element i reduced in the slag under the converter, kg; The alloy addition amount is less than the maximum value of the allowable alloy weight; x j ≤ L j Among them, L j is the maximum addition amount of the j-th alloy in the actual production of this steel grade. The maximum addition amounts of different alloys for different steel grades are determined according to the process production requirements and stored in the database; Step (6): After the converter tapping is completed, store the furnace number and the alloy addition amount result in the real-time database.

2. The method for low-cost control of alloy during tapping from a converter for aluminum-killed steel according to claim 1, characterized in that The real-time data of the converter production process in step (1) includes: furnace number, steel grade, hot metal charge, scrap addition amount, number of times the tapping hole is used, tapping time, converter end-point composition, converter end-point temperature, converter end-point oxygen content, tapping volume, converter slag volume, converter end-point slag composition, addition amount of each alloy during tapping, composition of the molten steel in the ladle after alloying, alloy composition, alloy price, target composition of the molten steel, and alloy element recovery rate.

3. The method for low-cost control of alloy addition during tapping of an aluminum-killed steel converter according to claim 1, characterized in that, The calculation process of the converter tapping volume in step (2) is: Control the range of the converter hot metal charge between 159 and 162 t, and calculate the hot metal recovery rate according to the empirical value of 0.89; Control the range of the converter scrap charge between 46 and 48 t, and calculate the scrap recovery rate according to the empirical value of 0.

80.

4. The method for low-cost control of alloy during tapping from a converter for aluminum-killed steel according to claim 1, wherein The alloy composition and alloy price in the real-time database are updated according to the alloy storage batch.

5. A system for implementing the method for low-cost control of alloy during tapping from a converter for aluminum-killed steel according to any one of claims 1-4, characterized in that, It includes a client, a batching server, and a memory. The client obtains the furnace number, steel grade, scrap weight, hot metal weight, number of times the tapping hole is used, converter end-point oxygen content, composition measurement information, steel grade composition control target, alloy price, and alloy composition. The batching server completes the alloy batching calculation according to the steel grade composition control target, alloy price, and alloy composition, stores the converter real-time data and the calculation result in the database, updates the statistical regression formula of the alloy recovery rate, and at the same time reads the content of P in the molten steel when refining to the station into the database to verify the calculation of the converter slag volume. The database and the calculation formula are stored in the memory.

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