Cold continuous rolling method and equipment for efficiently producing low-temperature high-magnetic-induction oriented silicon steel

Abstract

The invention relates to the technical field of oriented silicon steel cold rolling production, in particular to a cold continuous rolling method and equipment for efficiently producing low-temperature high-magnetic-induction oriented silicon steel. According to the method, efficient and stable production of the thin-gauge low-temperature high-magnetic-induction oriented silicon steel can be achieved, and meanwhile the excellent plate shape and the high-magnetic-induction performance are guaranteed; through cooperative control of targeted roll shape design and process parameters, the problems of edge drop and convexity of the steel strip can be accurately regulated and controlled, the strip shape defect easily occurring in the rolling process of the thin-gauge steel strip is effectively avoided, the finished steel strip has excellent straightness, and the rolling quality of the thin-gauge steel strip is improved. A good foundation is provided for smooth proceeding of subsequent procedures and stacking use of final products; meanwhile, by optimizing texture orientation control in the cold rolling process and combining with an efficient inhibitor formed through subsequent nitriding treatment, the magnetic induction intensity of the finished low-temperature high-magnetic-induction oriented silicon steel is remarkably improved, meanwhile, iron loss is reduced, the magnetic performance of the product is more excellent, and the use requirement of power equipment for efficient soft magnetic materials can be better met.

Description

Technical Field

[0001] This invention relates to the field of cold rolling production technology of grain-oriented silicon steel, specifically to a method and equipment for efficient cold continuous rolling of low-temperature, high-magnetic-induction grain-oriented silicon steel. Background Technology

[0002] Grain-oriented silicon steel is the core material of transformer cores in power and distribution systems, and its magnetic induction intensity and iron loss directly affect the transformer's energy efficiency. Based on magnetic properties, grain-oriented silicon steel is divided into ordinary grain-oriented silicon steel (CGO steel, magnetic induction intensity ≤1.88T) and high-magnetic-induction grain-oriented silicon steel (HiB steel, magnetic induction intensity ≥1.88T). According to the production process, HiB steel is further divided into high-temperature HiB steel (hot-rolled slab heating temperature >1350℃) and low-temperature HiB steel (hot-rolled slab heating temperature ≤1250℃). Low-temperature HiB steel, due to its lower production cost and superior product performance, has gradually replaced high-temperature HiB steel. It achieves excellent magnetic properties through a combination of low-temperature slab heating and subsequent nitriding processes, forming a perfect Goss orientation secondary recrystallization structure.

[0003] The manufacturing process of low-temperature HiB steel includes multiple steps such as steelmaking, continuous casting, hot rolling, normalizing, pickling, cold rolling, decarburization, and nitriding annealing. Among these, the cold rolling process directly determines the thickness of the finished product and is crucial to its shape and magnetic properties. With the increasing market demand for thin-gauge (≤0.20mm) low-temperature HiB steel, existing cold rolling technology faces many challenges: traditional production uses a 20-roll reversible Sendzimir mill with a work roll diameter of approximately 70mm. Although it can roll steel strip to 0.15-0.18mm, it suffers from poor continuous production capacity, low production efficiency, high energy consumption, insufficient rolling stability, poor thickness accuracy and shape quality, and adverse effects on the magnetic properties of the finished product.

[0004] While existing patents propose using an 18-roll, 6-stand cold rolling mill to produce grain-oriented silicon steel, they fail to consider the impact of roll design and process parameter coordination on the magnetic properties of the product, thus failing to simultaneously meet the demands for production efficiency, high magnetic induction, and excellent sheet shape. Therefore, there is an urgent need to develop a cold rolling method and equipment that can simultaneously improve the production efficiency, sheet shape quality, and magnetic induction intensity of thin-gauge low-temperature HiB steel. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a cold continuous rolling method and equipment for producing low-temperature high magnetic induction oriented silicon steel, which can realize the efficient and stable production of thin-gauge low-temperature high magnetic induction oriented silicon steel, while ensuring excellent plate shape and high magnetic induction performance.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A method for efficient cold continuous rolling of low-temperature, high-magnetic-induction grain-oriented silicon steel includes the following steps: S1, Raw material preparation: Select low-temperature high magnetic induction oriented silicon steel hot-rolled plate of preset thickness as raw material; S2, Pre-treatment before cold rolling: Before cold rolling, the raw steel strip is heated to a preset temperature range and subjected to aging treatment for a preset time period. After exiting the furnace, it immediately enters the cold rolling process. S3, Cold Rolling Mill and Roll Shape Optimization Design: The cold rolling process adopts an 18-roll, 6-stand cold rolling mill. Each stand is equipped with two sets of work rolls, two sets of intermediate rolls, two sets of large support rolls, four sets of side support rolls and eight sets of side support bearing rolls. The work rolls are all large-diameter work rolls of a preset size, and the intermediate rolls and work rolls of the first and second stands are all designed with a single taper roll shape. S4, Cold rolling process parameter control: Coordinated control of strip temperature and the reduction rate, rolling speed, rolling force, entry tension and tension difference between stands in the cold rolling mill during the cold continuous rolling process; S5, subsequent processing: The cold-rolled steel strip is subjected to decarburization and nitriding annealing, magnesium oxide release agent coating, high-temperature annealing, insulating coating coating and stretching and leveling annealing in sequence to obtain the finished low-temperature high magnetic induction oriented silicon steel.

[0007] Preferably, the thickness range of the low-temperature high magnetic induction oriented silicon steel hot-rolled plate is 1.8mm-2.3mm; the temperature range of the aging treatment is 200℃-250℃, and the aging treatment time is 5-10 minutes.

[0008] Preferably, in step S3, all the working rollers have a roller diameter D. 工 Large-diameter work rolls ranging from 160mm to 200mm; Furthermore, the end roll profiles of the upper intermediate roll operating side, upper work roll driving side, lower intermediate roll driving side, and lower work roll operating side of the first and second frames are all tapered at 5°-12°, and the roll diameter D of the side support roll is... 侧撑 With the diameter D of the work roll 工 The ratio ranges from 1:3 to 1:2.

[0009] Preferably, the working rollers of the first and second frames are composed of a flat roller area, a functional area, and a tapered area, with a total length of L. w And satisfy: L 板 ≤L a ≤L 板 +10mm; 5mm≤L b ≤20mm; L c :L w =1 / 8~1 / 9 In the formula, L a L b L cL represents the axial length of the flat roller zone, functional zone, and tapered zone, respectively. 板 The width of the finished strip is shown in mm.

[0010] Preferably, in step S4, during the cold continuous rolling process, the strip temperature is controlled by adjusting the emulsion flow rate to achieve aging rolling, so that the strip temperature at the exit of the first to fourth stands is at least in the range of 200℃-250℃ at least once, and the aging rolling time is in the range of 5-8 minutes.

[0011] Preferably, in step S4, the reduction rates of the first to sixth stands in the cold rolling mill are as follows: first stand 37%-40%, second stand 34%-38%, third stand 31%-35%, fourth stand 25%-33%, fifth stand 22%-31%, and sixth stand 15%-26%.

[0012] Preferably, in step S4, the ratio of rolling speeds between adjacent stands in the cold rolling mill unit satisfies: b n :b n+1 ≤V n+1 :V n ≤1.1*b n :b n+1 In the formula, b n V represents the steel strip exit thickness of the nth frame, in mm. n Let n be the rolling speed of the nth stand, in m / min; n takes values ​​of 1, 2, ... 5.

[0013] Preferably, in step S4, the rolling force of each stand in the cold rolling mill unit satisfies: Z1*2.5*(D 工 *h n ) 2 ≤M n ≤Z1*3*(D 工 *h n ) 2 In the formula, M n D represents the rolling force of the nth stand, in kN. 工 The working roll diameter is in mm; h n Z1 is the reduction rate of the nth stand, calculated as a decimal; n takes values ​​of 1, 2, ... 6; Z1 is the rolling force unit conversion factor.

[0014] Preferably, in step S4, the inlet tension of each stand in the cold rolling mill unit satisfies: Z2*360*b n,入 *h n ≤F n,入≤Z2*396*b n,入 *h n In the formula, F n,入 b is the inlet tension of the nth rack, in kN; n,入 h represents the thickness of the inlet steel strip for the nth rack, in mm. n Z2 is the reduction rate of the nth frame, calculated as a decimal; n takes values ​​of 1, 2, ... 6; Z2 is the tension unit conversion factor. Meanwhile, the tension difference between adjacent stands in the cold rolling mill unit satisfies: 0≤F n+1，入 -F n，出 ≤5KN In the formula, n takes values ​​of 1, 2, ... 5; and the tension difference between the inlet and outlet of the sixth rack satisfies 5 kN ≤ F. 6,入 -F 6,出 ≤15KN.

[0015] Based on the same inventive concept, the present invention also provides a cold rolling mill unit equipment for realizing the cold rolling method for efficiently producing low-temperature, high-magnetic-induction oriented silicon steel as described above.

[0016] Compared with the prior art, the present invention has the following main advantages: 1. This invention significantly improves the continuous production capacity of thin-gauge, low-temperature, high-magnetic-induction oriented silicon steel by adopting an 18-roll, six-stand mill with large roll diameter, combined with roll shape optimization and adjustment, and coordinated control of strip temperature, rolling force, tension, and reduction rate during the rolling process. It effectively improves the problems of low efficiency and high energy consumption in traditional rolling methods, while greatly reducing the risk of strip breakage during production, enhancing the stability of the rolling process, and ensuring the continuity and reliability of production.

[0017] 2. This invention, through targeted roll design and coordinated control of process parameters, can precisely regulate the edge drop and crown of the steel strip, effectively avoiding the plate shape defects that are prone to occur during the rolling of thin-gauge steel strips, so that the finished steel strip has excellent straightness, providing a good foundation for the smooth progress of subsequent processes and the stacking and use of the final product.

[0018] 3. By optimizing the texture orientation control during the cold rolling process and combining it with the efficient inhibitor formed by the subsequent nitriding treatment, this invention significantly improves the magnetic induction intensity of the finished low-temperature high magnetic orientation silicon steel, while reducing iron loss, making the product's magnetic properties more superior and better able to meet the needs of power equipment such as transformers for high-efficiency soft magnetic materials. Attached Figure Description

[0019] Figure 1 This is an overall flow chart of the cold continuous rolling method for efficiently producing low-temperature, high-magnetic-induction oriented silicon steel in an embodiment of the present invention; Figure 2 This is a schematic diagram of the single-tapered roller shape of the intermediate roller and working roller of the first and second frames in an embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0021] It should be noted that, depending on the implementation needs, the various steps / components described in this application can be broken down into more steps / components, or two or more steps / components or parts of the operation of steps / components can be combined into new steps / components to achieve the purpose of this invention.

[0022] In this invention, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

[0023] Example 1: This example provides a method for efficient cold continuous rolling of low-temperature, high-magnetic-induction grain-oriented silicon steel, such as... Figure 1 As shown, the main steps include the following: Step S1, Raw material preparation: Select low-temperature high magnetic induction oriented silicon steel hot-rolled strip with a thickness of 1.8mm-2.3mm as raw material to ensure that the raw material surface is free of defects and the thickness is uniform.

[0024] Step S2, Pre-treatment before cold rolling: Heat the raw steel strip to 200℃-250℃ and hold for 5-10 minutes for aging treatment. After reaching the set temperature, immediately proceed to the cold rolling process. This pre-treatment is beneficial for shape control during rolling and can prevent the precipitation of dissolved carbon and nitrogen in the steel after normalizing. It also fully utilizes the pinning effect of carbides on dislocations in the steel, allowing for the precipitation of fine and dispersed inhibitors after subsequent annealing, thus laying the foundation for improved magnetic properties.

[0025] Step S3, Cold Continuous Rolling Mill and Roll Profile Optimization Design: An 18-roll, 6-stand cold continuous rolling mill is used for rolling. The 18 rolls include two sets of work rolls, two sets of intermediate rolls, two sets of large support rolls, four sets of side support rolls, and eight sets of side support bearing rolls. in: 1) The diameter D of the working roll工 With a roll diameter of 160mm-200mm and a large roll diameter design, it is beneficial to improve the production efficiency of grain-oriented silicon steel. On the other hand, it can optimize stress distribution, promote the formation of secondary nuclei with accurate orientation, improve Gaussian orientation, and make it easier for the finished steel plate to obtain high magnetic induction. At the same time, for low-temperature high magnetic induction grain-oriented silicon steel, subsequent nitriding treatment is required. If small roll diameter cold rolling is used, N penetration is mainly concentrated in the shear deformation zone of the steel plate surface. However, the present invention uses large roll diameter cold rolling, and N penetration into the compression deformation zone of the steel strip can form nitride inhibitors more dispersedly and finely, with better inhibitory effect, thereby obtaining high magnetic induction. 2) In the six-stand rolling mill, the arrangement sequence of the first to sixth stands is consistent with the strip walking direction, and the intermediate rolls and work rolls on the first and second stands are all single-tapered rolls with a taper α of 5°-12°, which are used to control the axial lateral movement of the work rolls and the edge drop of the strip. The remaining stands use conventional rolls. like Figure 2 As shown, the upper intermediate roller operating side, upper work roller driving side, lower intermediate roller driving side, and lower work roller operating side of the first and second frames are all designed with a tapered shape. Meanwhile, since the single-tapered roller design is more expensive than the ordinary roller design, the present invention only adopts the single-tapered roller design for the intermediate rollers and working rollers of the first and second frames. This is mainly because the reduction ratio of the first and second frames is relatively large. The larger the reduction ratio, the more difficult it is to control the shape of the steel strip, the more likely the working rollers will experience axial lateral displacement, and the steel strip will experience edge drop.

[0026] 3) The work roll profile consists of a flat roll area L a Functional area L b and taper area L c It consists of 3 parts and has a total length of L. w Among them, the flat roller area L a With the width L of the finished strip 板 The following relationship exists: L 板 ≤L a ≤L 板 +10mm In the formula, L 板 L a The unit is mm.

[0027] Functional area L b Satisfy: 5mm≤L b ≤20mm.

[0028] Tapered area L c With the total length L of the work roll w Satisfy: L c :L w =1 / 8~1 / 9.

[0029] The roll shape of the work roll satisfies the above relationship, which is beneficial to obtaining oriented silicon steel with excellent strip shape, controlling the convexity of the steel strip, and preventing the edge drop of the steel strip.

[0030] 4) Due to the tapered design of the upper intermediate roller operating side and the lower intermediate roller driving side, when they are in full contact with the work roller under pressure, an axial force that is unfavorable to the thrust bearing may be generated.

[0031] Therefore, the ratio of the control-side support roller diameter to the working roller diameter in this invention is: D 侧撑 :D 工 =1:3-1:2, used to protect the thrust bearing and ensure stable operation of the equipment.

[0032] Step S4, Cold rolling process parameter control: S41, Reduction Rate Distribution: In the aforementioned 18-roll six-stand rolling mill, the reduction rates of the six stands are as follows: First stand F1 reduction rate 37%-40%, Second stand F2 reduction rate 34%-38%, Third stand F3 reduction rate 31%-35%, Fourth stand F4 reduction rate 25%-33%, Fifth stand F5 reduction rate 22%-31%, and Sixth stand F6 reduction rate 15%-26%. S42, Rolling speed control: The rolling speed V6 of the sixth stand (F6) is set to be the fastest, with an example of 700m / min-850m / min; and the ratio of rolling speeds between adjacent stands is inversely proportional to the exit thickness, satisfying the following: b n :b n+1 ≤V n+1 :V n ≤1.1*b n :b n+1 In the formula, b n V represents the steel strip exit thickness of the nth frame, in mm. n Let n be the rolling speed of the nth stand, in m / min; n takes values ​​of 1, 2, ... 5.

[0033] S43, strip temperature control: During the cold continuous rolling process, the strip temperature is controlled by the emulsion flow rate to achieve aging rolling. The strip temperature is controlled at 120-250℃ during the rolling process (the strip temperature drops to 60-80℃ after cold continuous rolling), and the strip temperature at the exit of the first to fourth stands is at least 200-250℃ at least once, with an aging rolling time of 5-8 minutes. Through at least one aging rolling, it is beneficial to increase the Goss texture in the finished strip and obtain low-temperature high magnetic induction oriented silicon steel with excellent magnetic properties.

[0034] S44, Rolling force control: Excessive rolling force can easily lead to strip breakage, while insufficient rolling force can prevent the achievement of the predetermined thickness and easily result in a large difference in the thickness of the steel strip along the width direction. Therefore, the present invention controls the rolling force M of the nth stand. n satisfy: Z1*2.5*(D 工 *h n ) 2 ≤M n ≤Z1*3*(D 工 *h n ) 2 In the formula, M n D represents the rolling force of the nth stand, in kN. 工 The working roll diameter is in mm; h n Z1 is the reduction rate of the nth stand, calculated as a decimal; n takes values ​​of 1, 2, ... 6; Z1 is the rolling force unit conversion factor.

[0035] S44, Tension Control: During continuous rolling, it is necessary to coordinate the tension between the stands before and after. If the tension between the stands is too high, it will cause the steel to be pulled up as a whole, and the exit width will become narrower. If the tension between the stands is too low, steel will pile up, which will lead to the steel being scrapped due to the separation between the stands. Therefore, the present invention controls the inlet tension F of the nth rack. n,入 satisfy: Z2*360*b n,入 *h n ≤F n,入 ≤Z2*396*b n,入 *h n In the formula, F n,入 b is the inlet tension of the nth rack, in kN; n,入 h represents the thickness of the inlet steel strip for the nth rack, in mm. n Z2 is the reduction rate of the nth frame, calculated as a decimal; n takes values ​​of 1, 2, ... 6; Z2 is the tension unit conversion factor.

[0036] At the same time, the tension difference between the front and rear frames should be controlled to meet the following requirements: 0≤F n+1，入 -F n，出 ≤5KN In the formula, n takes values ​​of 1, 2, ... 5; Furthermore, the tension difference between the inlet and outlet of the sixth rack satisfies 5KN≤F. 6,入 -F 6,出 ≤15KN, controlling the front and rear tension of the rolls on the last stand to prevent excessive tension, is beneficial for further adjustment of the plate shape during the last rolling pass.

[0037] By controlling the rolling force, tension, and reduction rate in the rolling process in a coordinated manner through the above steps, excellent sheet shape can be obtained while maintaining efficient rolling.

[0038] Step S5, subsequent processing: The cold-rolled steel strip is subjected to decarburization and nitriding annealing (nitriding amount controlled at 200ppm-250ppm), magnesium oxide release agent coating, high-temperature annealing, insulating coating coating and stretching and leveling annealing treatment in sequence to obtain the finished low-temperature high magnetic induction oriented silicon steel.

[0039] Example 2: This example uses a 2.3 mm thick low-temperature high-magnetic-induction oriented silicon steel hot-rolled plate as raw material, and rolls it into a 1250 mm wide and 0.23 mm thick strip using an 18-roll six-stand rolling mill. Wherein: Before cold rolling, the steel strip temperature is raised to 250 ℃ and aged for 5 minutes. After reaching the set temperature, it is immediately cold rolled.

[0040] The roll types used in the 18-roll, 6-stand rolling mill are shown in the table below:

[0041] The reduction rate, tension, rolling force, rolling speed, and strip temperature for each stand are shown in the table below:

[0042] The cold-rolled steel sheet is decarburized and nitrided annealed using conventional methods, with the nitriding amount controlled at around 200 ppm.

[0043] Magnesium oxide annealing release agent is applied, followed by high-temperature annealing; insulating coating is applied, and finally flat stretching annealing is performed to obtain the finished low-temperature high magnetic induction oriented silicon steel. The steel plate stacking factor is 0.98, the magnetic induction intensity B800 is 1.94 T, and the iron loss P1.7 / 50 is 0.75 w / kg.

[0044] Example 3: This example uses 1.8 mm thick low-temperature high-magnetic-induction oriented silicon steel hot-rolled plate as raw material, and rolls it into a steel strip with a width of 1250 mm and a thickness of 0.15 mm using an 18-roll six-stand rolling mill. Wherein: Before cold rolling, the steel strip temperature is raised to 220 ℃ and aged for 10 minutes. After reaching the set temperature, it is immediately cold rolled.

[0045] The roll types used in the 18-roll, 6-stand rolling mill are shown in the table below:

[0046] The reduction rate, tension, rolling force, rolling speed, and strip temperature for each stand are shown in the table below:

[0047] The cold-rolled steel sheet is decarburized and nitrided annealed using conventional methods, with the nitriding amount controlled at around 240 ppm.

[0048] Magnesium oxide annealing release agent is applied, followed by high-temperature annealing; insulating coating is applied, and finally tensile and leveling annealing is performed to obtain the finished low-temperature high magnetic induction oriented silicon steel. The steel plate stacking factor is 0.97, the magnetic induction intensity B800 is 1.93 T, and the iron loss P1.7 / 50 is 0.65 w / kg.

[0049] Example 4: Based on the same inventive concept, this example also provides a cold rolling mill unit equipment, which is used to realize the cold rolling method for efficiently producing low-temperature high magnetic induction oriented silicon steel as described above.

[0050] Furthermore, all parts of this application that are not described in detail are the same as or implemented using existing technology.

[0051] In summary: 1. This invention significantly improves the continuous production capacity of thin-gauge low-temperature high-magnetic-induction oriented silicon steel by adopting an 18-roll six-stand mill with large roll diameter, combined with roll shape optimization and adjustment, and coordinated control of temperature, rolling force, tension and reduction rate during the rolling process. It effectively improves the problems of low efficiency and high energy consumption of traditional rolling methods, while greatly reducing the risk of strip breakage during the production process, enhancing the stability of the rolling process, and ensuring the continuity and reliability of production.

[0052] 2. This invention, through targeted roll design and coordinated control of process parameters, can precisely regulate the edge drop and crown of the steel strip, effectively avoiding the plate shape defects that are prone to occur during the rolling of thin-gauge steel strips, so that the finished steel strip has excellent straightness, providing a good foundation for the smooth progress of subsequent processes and the stacking and use of the final product.

[0053] 3. By optimizing the texture orientation control during the cold rolling process and combining it with the efficient inhibitor formed by the subsequent nitriding treatment, this invention significantly improves the magnetic induction intensity of the finished low-temperature high magnetic orientation silicon steel, while reducing iron loss, making the product's magnetic properties more superior and better able to meet the needs of power equipment such as transformers for high-efficiency soft magnetic materials.

[0054] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0055] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0056] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for efficient cold continuous rolling of low-temperature, high-magnetic-induction grain-oriented silicon steel, characterized in that, Includes the following steps: S1, Raw material preparation: Select low-temperature high magnetic induction oriented silicon steel hot-rolled plate of preset thickness as raw material; S2, Pre-treatment before cold rolling: Before cold rolling, the raw steel strip is heated to a preset temperature range and subjected to aging treatment for a preset time period. After exiting the furnace, it immediately enters the cold rolling process. S3, Cold Rolling Mill and Roll Shape Optimization Design: The cold rolling process adopts an 18-roll, 6-stand cold rolling mill. Each stand is equipped with two sets of work rolls, two sets of intermediate rolls, two sets of large support rolls, four sets of side support rolls and eight sets of side support bearing rolls. The work rolls are all large-diameter work rolls of a preset size, and the intermediate rolls and work rolls of the first and second stands are all designed with a single taper roll shape. S4, Cold rolling process parameter control: Coordinated control of strip temperature and the reduction rate, rolling speed, rolling force, entry tension and tension difference between stands in the cold rolling mill during the cold continuous rolling process; S5, subsequent processing: The cold-rolled steel strip is subjected to decarburization and nitriding annealing, magnesium oxide release agent coating, high-temperature annealing, insulating coating coating and stretching and leveling annealing in sequence to obtain the finished low-temperature high magnetic induction oriented silicon steel.

2. The method for efficient cold continuous rolling of low-temperature high-magnetic-induction grain-oriented silicon steel according to claim 1, characterized in that, The thickness range of the low-temperature high magnetic induction oriented silicon steel hot-rolled plate is 1.8mm-2.3mm; the temperature range of the aging treatment is 200℃-250℃, and the aging treatment time is 5-10 minutes.

3. The method for efficient cold continuous rolling of low-temperature high-magnetic-induction grain-oriented silicon steel according to claim 1, characterized in that... In step S3, all the work rolls have a diameter D. 工 Large-diameter work rolls ranging from 160mm to 200mm; Furthermore, the end roll profiles of the upper intermediate roll operating side, upper work roll driving side, lower intermediate roll driving side, and lower work roll operating side of the first and second frames are all tapered at 5°-12°, and the roll diameter D of the side support roll is... 侧撑 With the diameter D of the work roll 工 The ratio ranges from 1:3 to 1:

2.

4. The cold continuous rolling method for efficiently producing low-temperature, high-magnetic-induction oriented silicon steel according to claim 3, characterized in that, The working rolls of the first and second frames consist of a flat roll area, a functional area, and a tapered area, with a total length of L. w And satisfy: L 板 ≤L a ≤L 板 +10mm; 5mm≤L b ≤20mm; L c :L w =1 / 8~1 / 9 In the formula, L a L b L c L represents the axial length of the flat roller zone, functional zone, and tapered zone, respectively. 板 The width of the finished strip is shown in mm.

5. The method for efficient cold continuous rolling of low-temperature high-magnetic-induction grain-oriented silicon steel according to claim 1, characterized in that... In step S4, during the cold continuous rolling process, the temperature of the steel strip is controlled by adjusting the emulsion flow rate to achieve aging rolling, so that the steel strip temperature at the exit of the first to fourth stands is at least in the range of 200℃-250℃ at least once, and the aging rolling time is in the range of 5-8 minutes.

6. The method for efficient cold continuous rolling of low-temperature high-magnetic-induction grain-oriented silicon steel according to claim 1, characterized in that... In step S4, the reduction rates of the first to sixth stands in the cold rolling mill are as follows: first stand 37%-40%, second stand 34%-38%, third stand 31%-35%, fourth stand 25%-33%, fifth stand 22%-31%, and sixth stand 15%-26%.

7. The method for efficient cold continuous rolling of low-temperature high-magnetic-induction grain-oriented silicon steel according to claim 1, characterized in that... In step S4, the ratio of rolling speeds between adjacent stands in the cold rolling mill unit satisfies: b n :b n+1 ≤V n+1 :V n ≤1.1*b n :b n+1 In the formula, b n V represents the steel strip exit thickness of the nth frame, in mm. n Let n be the rolling speed of the nth stand, in m / min; n takes values ​​of 1, 2, ...

5.

8. The method for efficient cold continuous rolling of low-temperature high-magnetic-induction grain-oriented silicon steel according to claim 1, characterized in that... In step S4, the rolling force of each stand in the cold rolling mill unit satisfies: Z1*2.5*(D 工 *h n ) 2 ≤M n ≤Z1*3*(D 工 *h n ) 2 In the formula, M n D represents the rolling force of the nth stand, in kN. 工 The working roll diameter is in mm; h n Z1 is the reduction rate of the nth stand, calculated as a decimal; n takes values ​​of 1, 2, ... 6; Z1 is the rolling force unit conversion factor.

9. The method for efficient cold continuous rolling of low-temperature high-magnetic-induction grain-oriented silicon steel according to claim 1, characterized in that... In step S4, the inlet tension of each stand in the cold rolling mill unit satisfies: Z2*360*b n,入 *h n ≤F n,入 ≤Z2*396*b n,入 *h n In the formula, F n,入 b is the inlet tension of the nth rack, in kN; n,入 h represents the thickness of the inlet steel strip for the nth rack, in mm. n Z2 is the reduction rate of the nth frame, calculated as a decimal; n takes values ​​of 1, 2, ... 6; Z2 is the tension unit conversion factor. Meanwhile, the tension difference between adjacent stands in the cold rolling mill unit satisfies: 0≤F n+1，入 -F n，出 ≤5KN In the formula, n takes values ​​of 1, 2, ... 5; and the tension difference between the inlet and outlet of the sixth rack satisfies 5 kN ≤ F. 6,入 -F 6,出 ≤15KN.

10. A cold continuous rolling mill unit equipment, characterized in that, A cold rolling method for achieving efficient production of low-temperature, high-magnetic-induction oriented silicon steel as described in any one of claims 1 to 9.

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