A steelmaking method for producing non-oriented silicon steel based on an electric arc furnace

Abstract

This application relates to the technical field of iron and steel smelting, specifically disclosing a steelmaking method for producing non-oriented silicon steel based on an electric arc furnace, comprising the following steps: smelting molten steel and hot metal in an electric arc furnace, controlling the tapping standard to be 0.4% ≤ [C] ≤ 0.6% and 40ppm ≤ [N] ≤ 80ppm; continuing VOD refining, with oxygen blowing at a vacuum of 10K~15Kpa; bottom blowing of argon gas into the ladle, controlling the [C] of the molten steel to ≤ 0.015%, stopping oxygen blowing and switching to VCD operation, controlling parameters such as equipment leakage rate, working vacuum, and time of maintaining high vacuum; switching to RH refining, with oxygen blowing, stopping oxygen blowing when the [C] of the molten steel is ≤ 30ppm, deoxidation, and adjusting the [Si] content using low-carbon ferrosilicon. Through the coordination of the above steps, this application simultaneously achieves decarburization and denitrification, reaching the production standard of high-grade non-oriented silicon steel, and can meet the requirements of continuous slab casting, realizing industrial continuous production.

Description

Technical Field

[0001] This application relates to the technical field of iron and steel smelting, and more specifically, it relates to a steelmaking method for producing non-oriented silicon steel based on an electric arc furnace. Background Technology

[0002] Non-oriented silicon steel is a silicon-iron alloy with very low carbon content. In deformed and annealed steel sheets, its grains exhibit an irregular orientation distribution, making it widely used as the core material for motors and transformers. Carbon in non-oriented silicon steel is a magnetic aging element; excessive carbon content will deteriorate the magnetic properties of the finished silicon steel. S readily forms fine MnS and CuS precipitates with Mn and Cu in the steel, which hinder domain rotation during magnetization. N readily forms TiN and AlN precipitates with alloying elements such as Al and Ti in the steel, which also hinder domain rotation during magnetization. Therefore, the higher the grade of non-oriented silicon steel, the lower the required content of these elements.

[0003] In the production processes of non-oriented silicon steel, for example, Chinese patents with patent numbers CN114045433A and CN112143974A primarily employ long-process converter smelting methods. Long-process converter smelting includes steps such as hot metal desulfurization, converter smelting, and RH refining. Although the long-process converter smelting process is basically mature, traditional long-process production requires large amounts of fuel, energy, and natural resources, which is detrimental to environmental protection. Since electric arc furnace steelmaking can utilize renewable energy and reduce pollution and waste generation during the manufacturing process, the industry is currently focusing on how to utilize electric arc furnaces to produce non-oriented silicon steel.

[0004] However, electric arc furnace steelmaking has poor control over carbon and nitrogen elements. Actual tests have shown that it is difficult to reduce carbon to below 30 ppm and nitrogen to below 60 ppm. Meanwhile, non-oriented silicon steel for new energy vehicles requires cast billets with C ≤ 30 ppm and N ≤ 20 ppm. Currently, there is no relevant non-oriented silicon steel production process that can stably and efficiently produce ultra-low iron loss non-oriented silicon steel using an electric arc furnace. Summary of the Invention

[0005] To address the technical problem of large fluctuations in the composition of molten steel produced by short-process electric arc furnaces, making it difficult to stably and continuously produce high-grade non-oriented silicon steel, this application provides a steelmaking method for producing non-oriented silicon steel based on an electric arc furnace.

[0006] This application provides a steelmaking method for producing non-oriented silicon steel based on an electric arc furnace, employing the following technical solution:

[0007] A steelmaking method for producing non-oriented silicon steel based on an electric arc furnace includes the following steps:

[0008] Electric arc furnace smelting: 30% to 50% of the furnace capacity of molten steel and blast furnace iron with [S] ≤ 10 ppm are added to the electric arc furnace. The electrodes are energized, oxygen is blown into the furnace and argon is used for bottom blowing. The steel is tapped. The tapping standard is: 0.4% ≤ [C] ≤ 0.6% and 40 ppm ≤ [N] ≤ 80 ppm.

[0009] VOD refining: The steel ladle obtained from electric arc furnace smelting is transported to the VOD refining process. Oxygen blowing begins when the vacuum level reaches 10K-15Kpa, with a top-blown oxygen flow rate of 2000-2500 Nm³. 3 / h; Argon bottom blowing in the ladle, control the molten steel [C] ≤ 0.015%, after stopping oxygen blowing, switch to VCD operation, the equipment leakage rate should be ≤ 1.5%, the working vacuum degree should be ≤ 60Pa, and maintain the high vacuum state for ≥ 15min;

[0010] RH refining: The steel ladle obtained from VOD refining is transferred to RH refining, oxygen is blown, and oxygen blowing is stopped when the steel composition [C] is ≤30ppm. Deoxidation is carried out according to the oxygen content of the steel, and the [Si] content is adjusted by using low carbon ferrosilicon.

[0011] Furthermore, in the electric arc furnace smelting step, the molten steel is derived from scrap steel, which is preheated to 500-800°C and added to the electric arc furnace.

[0012] Furthermore, the blast furnace molten iron in the electric arc furnace smelting step is obtained after being stirred by KR.

[0013] Furthermore, during the tapping process in the electric arc furnace smelting step, a sliding plate is used to block slag, low-C ferrosilicon alloying is carried out, and argon bottom blowing is started in the ladle, with a ladle clearance of 600-800mm.

[0014] Furthermore, the opening temperature in the VOD refining step is 1560–1580°C.

[0015] Furthermore, the argon bottom-blowing intensity in the VOD refining step is controlled at 0.9–1.1 Nm. 3 / ht.

[0016] Furthermore, in the VOD refining step, the equipment leakage rate is 1.2%, the working vacuum degree is 45 Pa, and the high vacuum state lasts for 18 minutes.

[0017] Furthermore, in the RH refining step, oxygen is blown at a rate of 600–800 Nm³. 3 / h.

[0018] Furthermore, in the RH refining step, deoxidation is performed using aluminum blocks with a purity >99.6%.

[0019] By adopting the above technical solution, this application has at least the following advantages:

[0020] 1. In this application, steel and iron are smelted in an electric arc furnace. By controlling the iron-to-iron ratio, controlling the range of C and N content in the steel produced by the electric arc furnace, using VOD oxygen blowing to remove C, and combining high vacuum deep removal of N, RH deep removal of C, and low-carbon ferrosilicon Si adjustment, simultaneous C and N removal is achieved. The [C] ≤ 30ppm, [N] ≤ 20ppm, and [S] ≤ 20ppm are stably and efficiently controlled to obtain high-grade non-oriented silicon steel that can be used in new energy vehicles.

[0021] 2. In this application, the parameters in each process are further optimized, so that the [C] before the final non-oriented silicon steel continuous casting is reduced to 28ppm, [N] is reduced to 12ppm, and [S] is reduced to 12ppm.

[0022] 3. This application uses low-S silicon steel scrap as raw material for molten steel, which reduces the production cost of non-oriented silicon steel while ensuring that the product still meets the control standards for C, N and S content of high-grade non-oriented silicon steel.

[0023] 4. The production time of each process in this application is reasonably controlled within 35 to 45 minutes, which can realize one-to-one correspondence between the main production equipment, making production convenient, meeting the requirements of continuous casting of slabs, and saving production time to achieve industrialized continuous production. Detailed Implementation

[0024] In this field, for energy conservation and environmental protection, the use of electric arc furnaces to replace traditional long-process converters for smelting is being considered. Currently, there is little technology in the industry using electric arc furnaces to produce non-oriented silicon steel. Through the applicant's actual experiments, it was found that electric arc furnaces have poor control over elements such as C and N during the steelmaking process. After electric arc furnace smelting, the final [C] of the molten steel was 0.10%, and the final [N] was 110 ppm. Even with subsequent RH refining operations, the final [C] of the ladle smelting could only be reduced to 35 ppm, and [N] only to 60 ppm. The [N] content still falls far short of the requirements for high-grade non-oriented silicon steel.

[0025] Referring to Chinese Patent No. CN112981038A, the applicant attempted to reduce the nitrogen content in non-oriented silicon steel by using an EAF electric arc furnace primary refining, LF refining, and VD vacuum treatment process. This resulted in silicon steel with a nitrogen content of 40 ppm, which could not achieve the low-nitrogen steel with [N] = 18 ppm as described in the patent literature. Furthermore, the preparation time varies significantly between processes, leading to problems such as continuous casting of molten steel and excessive processes that make temperature control difficult. The slag-containing refining in LF can easily cause secondary pollution of molten steel, and electrode ionization makes it difficult to control the amount of nitrogen absorbed by the molten steel. All of the above factors make it difficult for this process to guarantee the industrial production of high-quality non-oriented silicon steel.

[0026] Based on the above, the applicant has simultaneously adjusted the C, N, S and Si contents in non-oriented silicon steel by controlling the range of C and N content in the electric arc furnace, VOD oxygen blowing to remove C, high vacuum deep removal of N, RH deep removal of C, and low carbon ferrosilicon to adjust Si. After testing, it was found that not only can [C] be successfully controlled within 30ppm and [N] within 20ppm, but the continuous casting of high-quality non-oriented silicon steel can also be guaranteed.

[0027] To facilitate understanding of the present invention, the invention will be further described below with reference to embodiments and comparative examples, but is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough understanding of the disclosure of the present invention.

[0028] Example

[0029] Example 1

[0030] A steelmaking method for producing non-oriented silicon steel based on an electric arc furnace, comprising the following steps:

[0031] Electric arc furnace smelting: 45% scrap steel + 55% molten iron are selected and charged into the EAF electric arc furnace. The scrap steel is preheated to 700℃ before entering the furnace. The molten iron is treated by KR and the temperature is 1350℃. The molten iron [S] = 0.0008%. The process involves oxygen blowing and bottom blowing with argon. The final [C] = 0.45% and the final [N] = 80ppm. Slag is blocked by a sliding plate during tapping. Low-C ferrosilicon alloying is carried out during the process. Argon bottom blowing is turned on during the tapping process. The ladle clearance is 650mm after tapping. The cycle of electric arc furnace smelting is 40min.

[0032] VOD Refining: The ladle is transferred to the VOD refining unit. Oxygen blowing begins once the vacuum reaches 12 kPa. The initial molten steel temperature is 1565℃, and the top-blown oxygen flow rate is 2200 Nm³. 3 / h, the argon bottom blowing intensity of the ladle is controlled at 0.9 Nm. 3 / ht, molten steel [C] = 0.015%, stop oxygen blowing and switch to VCD operation, equipment leakage rate 1.1%, working vacuum degree 50Pa, high vacuum state for 15min, molten steel [N] = 15ppm; VOD refining production cycle 42min

[0033] RH Refining: The ladle is transferred to the RH refining plant, where oxygen is blown in at 650 Nm³. 3 / h, oxygen blowing is stopped after [C] = 28ppm, pure aluminum deoxidation and alloying are carried out to adjust the alloy composition, and the steel output [C] = 29ppm, [N] = 17ppm, [S] = 15ppm. The production cycle of RH refining is 36min.

[0034] Continuous casting: The molten steel obtained is continuously cast into slabs.

[0035] Example 2

[0036] A steelmaking method for producing non-oriented silicon steel based on an electric arc furnace, comprising the following steps:

[0037] Electric arc furnace smelting: 50% scrap steel and 50% molten iron are selected and charged into the EAF electric arc furnace. The scrap steel is preheated to 500℃ before entering the furnace. The molten iron is treated by KR and the temperature is 1350℃. The molten iron [S] = 0.0010%. Oxygen is blown during the process and argon is blown from the bottom. The final [C] = 0.6% and the final [N] = 70ppm. Slag is blocked by a sliding plate when tapping. Low-C ferrosilicon alloying is carried out during the process. Argon is blown from the bottom of the ladle during the tapping process. The ladle clearance is 700mm after tapping. The electric arc furnace smelting cycle is 42min.

[0038] VOD refining: The ladle is transferred to the VOD refining unit, and oxygen blowing begins once the vacuum reaches 15 kPa. The initial molten steel temperature is 1575℃, and the top-blown oxygen flow rate is 2000 Nm³. 3 / h, the argon bottom blowing intensity of the ladle is controlled at 1.1 Nm. 3 / ht, molten steel [C] = 0.013%, stop oxygen blowing and switch to VCD operation, equipment leakage rate 1.5%, working vacuum degree 60Pa, high vacuum state for 15min, molten steel [N] = 16ppm; VOD production cycle 40min;

[0039] RH Refining: The ladle is transferred to the RH refining plant, where oxygen is blown in at 650 Nm³. 3 / h, oxygen blowing is stopped after [C] = 30ppm, pure aluminum deoxidation and alloying are carried out to adjust the alloy composition, and the steel output has [C] = 30ppm, [N] = 18ppm, [S] = 12ppm, and the RH production cycle is 35min;

[0040] Continuous casting: The molten steel obtained is continuously cast into slabs.

[0041] Example 3

[0042] A steelmaking method for producing non-oriented silicon steel based on an electric arc furnace, comprising the following steps:

[0043] Electric arc furnace smelting: 42% scrap steel + 58% molten iron were selected and charged into the EAF electric arc furnace. The scrap steel was preheated to 620℃ before entering the furnace. The molten iron was treated by KR and the temperature was 1350℃. The molten iron [S] = 0.0010%. Oxygen was blown during the process and argon was blown from the bottom. The final [C] = 0.50% and the final [N] = 65ppm. Slag was blocked by a sliding plate during tapping. Low-C ferrosilicon alloying was carried out during the process. Argon was blown from the bottom of the ladle during the tapping process. The ladle clearance was 750mm after tapping. The electric arc furnace smelting cycle was 41min.

[0044] VOD Refining: The ladle is transferred to the VOD refining unit. Oxygen blowing begins when the vacuum reaches 11 kPa. The molten steel temperature is 1575℃, the top-blown oxygen flow rate is 2500 Nm³ / h, and the bottom-blown argon intensity is controlled at 1.0 Nm³ / ht. The molten steel [C] = 0.014%. Oxygen blowing is stopped, and the system switches to VCD operation. The equipment leakage rate is 1.2%, the working vacuum is 45 Pa, and the high vacuum state lasts for 17 minutes. The molten steel [N] = 13 ppm. The VOD production cycle is 42 minutes.

[0045] RH Refining: The ladle is transferred to the RH refining plant, where oxygen is blown in at 650 Nm³. 3 / h, oxygen blowing is stopped after [C] = 25ppm, pure aluminum deoxidation and alloying are carried out to adjust the alloy composition, and the steel output [C] = 27ppm, [N] = 15ppm, [S] = 14ppm, RH production cycle is 35min;

[0046] Continuous casting: The molten steel obtained is continuously cast into slabs.

[0047] Example 4

[0048] A steelmaking method for producing non-oriented silicon steel based on an electric arc furnace, comprising the following steps:

[0049] Electric arc furnace smelting: 30% scrap steel and 70% molten iron were selected and charged into the EAF electric arc furnace. The scrap steel was preheated to 800℃ before entering the furnace. The molten iron was treated by KR and the temperature was 1350℃. The molten iron [S] = 0.0010%. Oxygen was blown in the process and argon was blown at the bottom. The final [C] = 0.40% and the final [N] = 60ppm. Slag was blocked by a sliding plate when tapping. Low-C ferrosilicon alloying was carried out in the process. Argon was blown at the bottom of the ladle during the tapping process. The ladle clearance was 700mm after tapping. The electric arc furnace smelting cycle was 39min.

[0050] VOD refining: The ladle is transferred to the VOD refining unit, and oxygen blowing begins once the vacuum reaches 10 kPa. The initial temperature of the molten steel is 1575℃, and the top-blown oxygen flow rate is 2500 Nm³. 3 / h, the argon bottom blowing intensity of the ladle is controlled at 1.0 Nm. 3 / ht, molten steel [C] = 0.014%, stop oxygen blowing and switch to VCD operation, equipment leakage rate 1.2%, working vacuum degree 45Pa, high vacuum state 18min, molten steel [N] = 10ppm; VOD production cycle 39min;

[0051] RH Refining: The ladle is transferred to the RH refining plant, where oxygen is blown in at 650 Nm³. 3 Oxygen blowing is stopped at a rate of / h until [C] = 26ppm. Pure aluminum is then deoxidized and alloyed to adjust the alloy composition. The resulting steel has [C] = 28ppm and [N] = 12ppm.

[0052] [S] = 12ppm, RH production cycle 36min;

[0053] Continuous casting: The molten steel obtained is continuously cast into slabs.

[0054] Comparative Example

[0055] Comparative Example 1

[0056] A steelmaking method for producing non-oriented silicon steel based on an electric arc furnace, comprising the following steps:

[0057] Electric arc furnace smelting: 45% scrap steel + 55% molten iron were selected and charged into the EAF electric arc furnace. The molten iron was treated by KR and the temperature was 1350℃. The molten iron [S] = 0.0010%. The final point of the electric arc furnace smelting of molten steel [C] = 0.10% and the final point [N] = 110ppm.

[0058] RH refining: The ladle is transferred to the RH refining plant, where oxygen is blown and alloying is performed. The final smelting result is [C] = 35 ppm.

[0059] [N] = 60ppm;

[0060] Continuous casting: The molten steel obtained is continuously cast into slabs.

[0061] Comparative Example 2

[0062] Electric arc furnace smelting: 45% scrap steel and 55% molten iron are selected and charged into the EAF electric arc furnace. The scrap steel is preheated to 700℃ before entering the furnace. The molten iron is treated by KR and the temperature is 1350℃. The molten iron [S] = 0.0010%. The process involves oxygen blowing and bottom blowing with argon. The final [C] = 0.40% and the final [N] = 60ppm. Slag is blocked by a sliding plate during tapping. Low-C ferrosilicon alloying is carried out during the process. Argon bottom blowing is turned on during the tapping process. The ladle clearance is 700mm after tapping.

[0063] RH Refining: The ladle is transferred to the RH refining plant, where oxygen is blown in at 650 Nm³. 3 / h, oxygen blowing is stopped after [C] = 26ppm, pure aluminum is deoxidized and alloyed to adjust the alloy composition, and the steel output has [C] = 28ppm, [N] = 45ppm;

[0064] Continuous casting: The molten steel obtained is continuously cast into slabs.

[0065] Comparative Example 3

[0066] Electric arc furnace smelting: 45% scrap steel + 55% molten iron were selected and charged into the EAF electric arc furnace. The scrap steel was preheated to 600℃ before entering the furnace. The molten iron was treated by KR and the temperature was 1350℃. The molten iron [S] = 0.0010%. Oxygen was blown during the process and argon was blown from the bottom. The final [C] = 0.55% and the final [N] = 80ppm. Slag was blocked by a sliding plate during tapping. Low-C ferrosilicon alloying was carried out during the process. Argon was blown from the bottom of the ladle during the tapping process. The ladle clearance was 650mm after tapping.

[0067] VOD Refining: The ladle is transferred to the VOD refining unit. Oxygen blowing begins once the vacuum reaches 12 kPa. The initial molten steel temperature is 1565℃, and the top-blown oxygen flow rate is 2200 Nm³. 3 / h, the argon bottom blowing intensity of the ladle is controlled at 1.0 Nm. 3 / ht, molten steel [C] = 30ppm, stop oxygen blowing and switch to VCD operation, equipment leakage rate 2.3%, working vacuum degree 100Pa, high vacuum state for 10min, molten steel [N] = 40ppm, VOD refining cycle 120min;

[0068] During the casting process, it was found that the following phenomenon was prone to occur, making it difficult to ensure continuous casting.

[0069] Comparative Example 4

[0070] Electric arc furnace smelting: 45% scrap steel and 55% molten iron are selected and charged into the EAF electric arc furnace. The scrap steel is preheated to 700℃ before entering the furnace. The molten iron is treated by KR and the temperature is 1350℃. The molten iron [S] = 0.0010%. The process involves oxygen blowing and bottom blowing with argon. The final [C] = 0.045% and the final [N] = 60ppm. Slag is blocked by a sliding plate during tapping. Low-C ferrosilicon alloying is carried out during the process. Argon bottom blowing is turned on during the tapping process. The ladle clearance is 650mm after tapping.

[0071] Step 2: The ladle is transferred to VOD refining. Oxygen blowing begins once the vacuum reaches 12 kPa. The molten steel temperature is 1565℃, and the top-blown oxygen flow rate is 2200 Nm³. 3 / h, the argon bottom blowing intensity of the ladle is controlled at 1.0 Nm. 3 / ht, molten steel [C] = 0.015%, stop oxygen blowing and switch to VCD operation, equipment leakage rate 2.3%, working vacuum degree 100Pa, high vacuum state for 10min, molten steel [N] = 40ppm;

[0072] Step 3: The ladle is transferred to the RH refining plant, where oxygen is blown at 650 Nm3 / h until [C] = 30 ppm. Then oxygen blowing is stopped, and pure aluminum is deoxidized and alloyed to adjust the alloy composition. The steel is tapped with [C] = 30 ppm and [N] = 45 ppm.

[0073] Step 4: The obtained molten steel is continuously cast into slabs.

[0074] in conclusion:

[0075] Compared with Example 1, Comparative Examples 1-4 only used electric arc furnace smelting to smelt scrap steel and molten iron, and the steel was directly transferred to RH refining without any treatment during the tapping process. Although the carbon content of the obtained steel was low, close to the requirements of high-grade non-oriented silicon steel, the [N] was too high, exceeding the standard by 3 times, and the denitrification effect was poor.

[0076] Although the tapping process in Comparative Example 2 was modified during the electric arc furnace smelting step, the improvement in denitrification effect was limited, and the nitrogen content of the resulting steel was still more than twice that of the standard for high-grade non-oriented silicon steel.

[0077] Comparative Example 3 lacks an RH refining step and does not strictly control the equipment leakage rate, working vacuum degree, and high vacuum state time in VOD refining, resulting in a long cycle for the final steel in the VOD refining step. The nitrogen content of the resulting molten steel is still twice that of the standard for high-grade non-oriented silicon steel. Furthermore, the method in Comparative Example 3 cannot be continuously cast.

[0078] In Comparative Example 4, the equipment leakage rate, working vacuum degree, and high vacuum state time in VOD refining were not strictly controlled, and low-carbon ferrosilicon was not added for adjustment in the RH refining step, resulting in an increase in the final carbon and nitrogen content.

[0079] In summary, the process steps in this application, such as controlling the iron-to-metal ratio, controlling the range of C and N content in the electric arc furnace, VOD oxygen blowing for C removal, high vacuum deep N removal, RH deep C removal, and low-carbon ferrosilicon Si adjustment, interact with each other. Only by cooperating with each other can the simultaneous C and N removal be achieved, and the effect of stable and efficient control of [C] ≤ 30ppm, [N] ≤ 20ppm, and [S] ≤ 20ppm be obtained. This results in high-grade non-oriented silicon steel that can be used in new energy vehicles.

[0080] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] Furthermore, the above-described embodiments merely illustrate several implementation methods of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A steelmaking method for producing non-oriented silicon steel based on an electric arc furnace, characterized in that, Includes the following steps: Electric arc furnace smelting: 30% to 50% of the furnace capacity of molten steel and blast furnace iron with [S] ≤ 10 ppm are added to the electric arc furnace. The electrodes are energized, oxygen is blown into the furnace and argon is used for bottom blowing. The steel is tapped. The tapping standard is: 0.4% ≤ [C] ≤ 0.6% and 40 ppm ≤ [N] ≤ 80 ppm. VOD refining: The steel ladle obtained from electric arc furnace smelting is transported to the VOD refining process. Oxygen blowing begins when the vacuum level reaches 10 kPa to 15 kPa, with a top-blown oxygen flow rate of 2000 to 2500 Nm³. 3 / h; Argon bottom blowing in the ladle, control the molten steel [C] ≤ 0.015%, after stopping oxygen blowing, switch to VCD operation, the equipment leakage rate should be ≤ 1.5%, the working vacuum degree should be ≤ 60Pa, and maintain the high vacuum state for ≥ 15min; RH refining: The steel ladle obtained from VOD refining is transferred to RH refining, oxygen is blown, and oxygen blowing is stopped when the steel composition [C] is ≤30ppm. Deoxidation is carried out according to the oxygen content of the steel, and the [Si] content is adjusted by using low carbon ferrosilicon.

2. The steelmaking method for producing non-oriented silicon steel based on an electric arc furnace as described in claim 1, characterized in that: In the electric arc furnace smelting step, the molten steel comes from scrap steel, which is preheated to 500-800°C and added to the electric arc furnace.

3. The steelmaking method for producing non-oriented silicon steel based on an electric arc furnace as described in claim 1, characterized in that: In the electric arc furnace smelting process, a sliding plate is used to block slag during tapping, and low-C ferrosilicon alloying is carried out. Argon bottom blowing is also started in the ladle, and the ladle clearance is 600-800mm.

4. The steelmaking method for producing non-oriented silicon steel based on an electric arc furnace as described in claim 1, characterized in that: The opening temperature in the VOD refining step is 1560–1580°C.

5. The steelmaking method for producing non-oriented silicon steel based on an electric arc furnace as described in claim 4, characterized in that: In the VOD refining step, the argon bottom blowing intensity is controlled at 0.9–1.1 Nm. 3 / ht.

6. The steelmaking method for producing non-oriented silicon steel based on an electric arc furnace as described in claim 4, characterized in that: The VOD refining step involves an equipment leakage rate of 1.2%, a working vacuum of 45 Pa, and a high vacuum state for 18 minutes.

7. The steelmaking method for producing non-oriented silicon steel based on an electric arc furnace as described in claim 1, characterized in that: The RH refining step involves oxygen blowing at a rate of 600–800 Nm. 3 / h.

8. The steelmaking method for producing non-oriented silicon steel based on an electric arc furnace as described in claim 7, characterized in that: In the RH refining step, deoxidation is performed using aluminum blocks with a purity >99.6%.