A high-speed casting method for efficient non-oriented silicon steel

Abstract

The present invention discloses a high-speed casting method for high-efficiency non-oriented silicon steel, and the specific steps are as follows: first, the molten steel enters the continuous casting machine after being smelted in a converter and subjected to RH vacuum refining; then, the sector of the continuous casting machine is divided into 12 casting strands, and different water flow rates are set for each casting strand; finally, the pulling speed is set to 1.5 m / min, the superheat of the molten steel and the water inlet temperature of the crystallizer are controlled, and the casting is completed; after the ingot is cast, the high-efficiency non-oriented silicon steel is obtained after uniform heating, continuous rolling and coiling. The high-speed casting method of the present invention not only greatly shortens the casting time, but also further enhances the efficiency of the furnace-machine matching, thereby significantly improving the overall production efficiency of the continuous casting machine. At the same time, during the high-speed casting process, by setting the zoned flow rate of the sector of the continuous casting machine, the narrow side bulging of the ingot is effectively avoided, thereby ensuring the size and shape accuracy of the ingot and improving the overall quality of the product.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-speed casting method for high-efficiency non-oriented silicon steel. Background Art

[0002] In today's steel production, continuous casting technology, as an efficient and continuous production method, has been widely used in the production of various steel products. However, with the growing market demand for high-quality, high-performance steel products such as high-efficiency non-oriented silicon steel, some problems in the continuous casting process have gradually become prominent, especially in the production of high-efficiency non-oriented silicon steel.

[0003] High-efficiency non-oriented silicon steel, a key electrical steel material, is widely used in the manufacture of electrical equipment such as motors and transformers due to its excellent magnetic properties and low iron loss. However, due to the specific performance requirements of this type of steel, its cross-section dimensions are often small, resulting in long pouring times during continuous casting. This prolonged pouring process not only increases energy consumption but also affects furnace-machine matching and continuous casting efficiency, becoming a key factor restricting production efficiency and economic benefits.

[0004] Furthermore, during high-speed casting, bulging is prone to occur on the narrow side of the ingot. This bulging not only causes deviations in the ingot's size and shape but also affects its internal quality, resulting in defects such as internal cracks and inclusions. This, in turn, hinders stable product quality control and smooth production. The bulging problem is related to a variety of factors, including pouring speed, mold design, and mold slag properties. Therefore, a comprehensive approach to addressing these factors is crucial.

[0005] To address these issues, the industry has conducted a series of research and exploration efforts. On the one hand, efforts are underway to optimize continuous casting process parameters, such as reducing pouring speed and adjusting mold vibration parameters, to reduce the occurrence of bulging. On the other hand, improvements to continuous casting equipment, such as adopting new molds and optimizing mold powder properties, are being made to improve the quality and production efficiency of ingots. However, while these measures can alleviate the problem to a certain extent, they cannot fundamentally resolve the issues of long pouring times and bulging. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the present invention provides a high-speed casting method for high-efficiency non-oriented silicon steel, which has the advantages of short casting time and increased casting speed.

[0007] The present invention is achieved through the following technical solutions:

[0008] A high-speed casting method for high-efficiency non-oriented silicon steel comprises the following steps:

[0009] Step 1) The molten steel is smelted in a converter and then subjected to RH vacuum refining before entering a continuous casting machine;

[0010] Step 2) The sectors of the continuous casting machine are divided and numbered into 12 strand zones, and flow rates are set for the 12 strand zones as follows:

[0011] The water flow rate in the first casting zone is set to 80-150 L / min;

[0012] The water flow rate of the second casting zone is set at 400-490 L / min;

[0013] The water flow rate of the third casting zone is set at 1270-1360 L / min;

[0014] The water flow rate of the fourth casting zone is set at 1200-1320 L / min;

[0015] The water flow rate of the 5th casting zone is set at 600-650L / min;

[0016] The water flow rate of the sixth casting zone is set at 380-450 L / min;

[0017] The water flow rate of the 7th casting zone is set at 462L / min;

[0018] The water flow rate of the 8th casting zone is set to 270L / min;

[0019] The water flow rate of the 9th casting zone is set to 360L / min;

[0020] The water flow rate of the 10th casting zone is set to 210L / min;

[0021] The water flow rate of the 11th casting zone is set to 320L / min;

[0022] The water flow rate of the 12th casting zone is set to 160L / min;

[0023] Step 3) The casting speed is set to 1.5 m / min, the superheat of the molten steel and the water inlet temperature of the crystallizer are controlled, and the casting is completed;

[0024] Step 4) After casting into a billet, high-efficiency non-oriented silicon steel is obtained through soaking, continuous rolling and coiling.

[0025] Preferably, the flow rates of the 12 casting strand zones in step 2) are set as follows:

[0026] The water flow rate in the first casting zone is set to 130L / min;

[0027] The water flow rate of the second strand zone is set at 460L / min;

[0028] The water flow rate of the third casting zone is set to 1330L / min;

[0029] The water flow rate of the fourth casting zone is set to 1280L / min;

[0030] The water flow rate of the 5th casting zone is set to 630L / min;

[0031] The water flow rate of the sixth strand zone is set at 420 L / min;

[0032] The water flow rate of the 7th casting zone is set at 462L / min;

[0033] The water flow rate of the 8th casting zone is set to 270L / min;

[0034] The water flow rate of the 9th casting zone is set to 360L / min;

[0035] The water flow rate of the 10th casting zone is set to 210L / min;

[0036] The water flow rate of the 11th casting zone is set to 320L / min;

[0037] The water flow rate of the 12th casting zone is set to 160L / min.

[0038] Preferably, the fluctuation range of the water flow rate in the first and second casting strand zones is ±10 L / min; the fluctuation range of the water flow rate in the third to twelfth casting strand zones is ±20 L / min.

[0039] Preferably, in step 3), the superheat of the molten steel is controlled at 10-25°C.

[0040] Preferably, the water inlet temperature of the crystallizer in step 3) is controlled at 23-25°C.

[0041] The beneficial effects of the present invention are as follows:

[0042] The high-speed casting method of the present invention increases the casting speed from the original 1.0m / min to 1.5m / min. This increase not only greatly shortens the casting time, but also further enhances the efficiency of furnace-machine matching, thereby significantly improving the overall production efficiency of the continuous casting machine. The increase in the casting speed increases the amount of steel passed per unit time, from the previous 2t / min to the current 3.1t / min. This significant production increase directly leads to a reduction in production costs and improves the economic benefits of the enterprise. At the same time, during the high-speed casting process, by setting the zoned flow rate of the fan-shaped section of the continuous casting machine, the occurrence of bulging on the narrow side of the billet is effectively avoided, thereby ensuring the size and shape accuracy of the billet and improving the overall quality of the product. The high-speed casting method of the present invention not only improves the production efficiency of the continuous casting machine and reduces production costs, but also ensures stable control of product quality, and is suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 Schematic diagram of the partition of the continuous casting machine sector. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] Example 1

[0046] A high-speed casting method for high-efficiency non-oriented silicon steel, the specific steps are as follows:

[0047] (1) The molten steel enters the continuous casting machine after being smelted in a converter and subjected to RH vacuum refining.

[0048] (2) Divide and number the sectors of the continuous casting machine, such as Figure 1 As shown, the sector segment is divided into 12 casting strand areas from the start to the end, and the flow rate of the 12 casting strand areas is set as shown in Table 1 below:

[0049] Table 1 Partition flow setting of Example 1

[0050] Casting area Water flow rate (L / min) 1 80±10 2 400±10 3 1270±20 4 1200±20 5 600±20 6 380±20 7 462±20 8 270±20 9 360±20 10 210±20 11 320±20 12 160±20

[0051] (3) The casting speed is set to 1.5 m / min, the superheat of the molten steel is controlled at 10-25°C, the water inlet temperature of the crystallizer is controlled at 23-25°C, and the casting is completed.

[0052] (4) After being cast into ingots, high-efficiency non-oriented silicon steel is produced through uniform heating, continuous rolling and coiling.

[0053] Example 2

[0054] A high-speed casting method for high-efficiency non-oriented silicon steel, wherein steps (1), (3), and (4) are the same as those in Example 1, and the flow rates of the 12 casting strand zones in step (2) are set as shown in Table 2 below:

[0055] Table 2 Partition flow setting of Example 2

[0056]

[0057]

[0058] Example 3

[0059] A high-speed casting method for high-efficiency non-oriented silicon steel, wherein steps (1), (3), and (4) are the same as those in Example 1, and the flow rates of the 12 casting strand zones in step (2) are set as shown in Table 3 below:

[0060] Table 3 Partition flow settings for Example 3

[0061] Casting area Water flow rate (L / min) 1 130±10 2 460±10 3 1330±20 4 1280±20 5 630±20 6 420±20 7 462±20 8 270±20 9 360±20 10 210±20 11 320±20 12 160±20

[0062] Example 4

[0063] A high-speed casting method for high-efficiency non-oriented silicon steel, wherein steps (1), (3), and (4) are the same as those in Example 1, and the flow rates of the 12 casting strand zones in step (2) are set as shown in Table 4 below:

[0064] Table 4 Partition flow setting of Example 4

[0065] Casting area Water flow rate (L / min) 1 150±10 2 490±10 3 1360±20 4 1320±20 5 650±20 6 450±20 7 462±20 8 270±20 9 360±20 10 210±20 11 320±20 12 160±20

[0066] Test Example 1

[0067] The high-efficiency non-oriented silicon steels produced in Examples 1-4 were quality-tested and graded based on the incidence of inclusion defects in the ingots: Grade A ≤ 0.8%, 0.8% < Grade B ≤ 1.5%, and Grade C > 1.5%. The high-efficiency non-oriented silicon steel produced in Example 3 was rated A, the high-efficiency non-oriented silicon steel produced in Example 2 was rated B, and the high-efficiency non-oriented silicon steels produced in Examples 1 and 4 were both rated C. The product quality of Example 3 was the highest.

[0068] The embodiments described above are only some of the embodiments of the present invention, rather than all of the embodiments. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but merely represents selected embodiments of the present invention. The scope of protection of the present invention shall be based on the scope required by the claims. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative efforts shall fall within the scope of protection of the present invention.

Claims

1. A high-speed casting method for high-efficiency non-oriented silicon steel, characterized in that: The following steps are involved: Step 1) The molten steel is smelted in a converter and then subjected to RH vacuum refining before entering a continuous casting machine; Step 2) The sectors of the continuous casting machine are divided and numbered into 12 strand zones, and flow rates are set for the 12 strand zones as follows: The water flow rate in the first casting zone is set to 80-150 L / min; The water flow rate of the second casting zone is set at 400-490 L / min; The water flow rate of the third casting zone is set at 1270-1360 L / min; The water flow rate of the fourth casting zone is set at 1200-1320 L / min; The water flow rate of the 5th casting zone is set at 600-650L / min; The water flow rate of the sixth casting zone is set at 380-450 L / min; The water flow rate of the 7th casting zone is set at 462L / min; The water flow rate of the 8th casting zone is set to 270L / min; The water flow rate of the 9th casting zone is set to 360L / min; The water flow rate of the 10th casting zone is set to 210L / min; The water flow rate of the 11th casting zone is set to 320L / min; The water flow rate of the 12th casting zone is set to 160L / min; Step 3) setting the pulling speed to 1.5 m / min, controlling the superheat of the molten steel and the water inlet temperature of the crystallizer, and completing the casting; Step 4) after casting into a billet, it is then subjected to soaking, continuous rolling and coiling to obtain high-efficiency non-oriented silicon steel.

2. The high-speed casting method for high-efficiency non-oriented silicon steel according to claim 1, characterized in that: Step 2) The flow rates of the 12 casting strand zones are set as follows: The water flow rate in the first casting zone is set to 130L / min; The water flow rate of the second strand zone is set at 460L / min; The water flow rate of the third casting zone is set to 1330L / min; The water flow rate of the fourth strand zone is set at 1280 L / min; The water flow rate of the 5th casting zone is set to 630L / min; The water flow rate of the sixth strand zone is set at 420 L / min; The water flow rate of the 7th casting zone is set at 462L / min; The water flow rate of the 8th casting zone is set to 270L / min; The water flow rate of the 9th casting zone is set to 360L / min; The water flow rate of the 10th casting zone is set to 210L / min; The water flow rate of the 11th casting zone is set to 320L / min; The water flow rate of the 12th casting zone is set to 160L / min.

3. The high-speed casting method for high-efficiency non-oriented silicon steel according to claim 2, characterized in that: The fluctuation range of the water flow rate in the 1st and 2nd casting zones is ±10L / min; the fluctuation range of the water flow rate in the 3rd to 12th casting zones is ±20L / min.

4. The high-speed casting method for high-efficiency non-oriented silicon steel according to claim 1, characterized in that: Step 3) The superheat of the molten steel is controlled at 10-25°C.

5. The high-speed casting method for high-efficiency non-oriented silicon steel according to claim 1, characterized in that: Step 3) The water inlet temperature of the crystallizer is controlled at 23-25°C.

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