Rolling process of silicon steel strip and application of rolling process

Abstract

The invention relates to the technical field of silicon steel treatment, and particularly discloses a rolling process of a silicon steel strip and application thereof, and the rolling process comprises the following steps: S1, preparing a hot-rolled coil; s2, uncoiling the hot-rolled coil to form a steel strip, and carrying out normalizing pickling treatment on the steel strip; s3, carrying out electromagnetic induction heating on the steel strip subjected to normalizing and pickling treatment, and rolling to form a steel coil; s4, the steel coil is subjected to heat preservation heating through a box-type heat preservation furnace; s5, the steel coil obtained after heat preservation and heating is subjected to rolling treatment; according to the rolling process, a combined heat treatment link of electromagnetic induction heating and box-type heat preservation furnace heat preservation heating is introduced after normalizing pickling treatment and before rolling treatment, so that a steel strip without edge shearing has enough plasticity and toughness at the rolling temperature, and can bear rolling stress without edge cracking; the problems that raw materials are wasted, the yield is reduced, the cost is increased, edge cracking defects are caused by burrs and the like due to edge shearing in a conventional silicon steel strip rolling process are solved.

Description

Technical Field

[0001] The present application relates to the technical field of silicon steel processing, and in particular to a silicon steel strip rolling process and application thereof. Background Art

[0002] In the silicon steel strip rolling process, the production of high-magnetic-induction oriented silicon steel typically follows a standardized process, including hot-rolled coil preparation, edge trimming, normalizing and pickling, electromagnetic induction heating, and rolling. This process is designed to ensure stable product performance and production continuity. The industry trend is to continuously optimize the process to improve resource utilization and production efficiency to meet growing market demand.

[0003] However, conventional processes present significant challenges. Edge trimming is essential during the hot-rolled coil preparation phase to remove edge defects. This results in raw material waste, as the edge material is removed, reducing yield and increasing material costs. Burrs generated during edge trimming can easily lead to edge cracking during subsequent rolling, compromising the surface integrity and mechanical properties of the silicon steel strip and potentially reducing product quality. These challenges collectively hinder rolling process optimization and cost control.

[0004] There is currently no effective technical solution to the above problems. Summary of the Invention

[0005] The purpose of this application is to provide a silicon steel strip rolling process and its application, so as to solve the problems of raw material waste, reduced yield, increased cost and burr-induced edge cracking defects caused by edge shearing in conventional silicon steel strip rolling processes, and to improve material utilization and product quality stability.

[0006] In a first aspect, the present application provides a silicon steel strip rolling process for cold rolling the silicon steel strip, the rolling process comprising the following steps:

[0007] S1, prepare hot rolled coil;

[0008] S2, uncoiling the hot-rolled coil to form a steel strip, and performing normalizing pickling treatment on the steel strip;

[0009] S3, performing electromagnetic induction heating on the steel strip after normalizing pickling treatment, and winding it into a steel coil;

[0010] S4, using a box-type insulation furnace to heat the steel coil;

[0011] S5. Rolling the steel coil after heat preservation and heating.

[0012] The rolling process of the present application introduces a combined heat treatment step of electromagnetic induction heating and box-type holding furnace insulation heating after normalizing pickling treatment and before rolling treatment, so that the untrimmed steel strip has sufficient plasticity and toughness at the rolling temperature and can withstand rolling stress without cracking. It solves the problems of raw material waste, reduced yield, increased cost and burr-induced cracking defects caused by trimming in conventional silicon steel strip rolling processes, thereby improving material utilization and product quality stability.

[0013] In the rolling process of the silicon steel strip, in step S2, the normalizing pickling treatment includes: normalizing treatment, shot blasting treatment and surface pickling treatment performed in sequence.

[0014] In this example, normalizing treatment is the first step, which aims to improve the internal structure of the steel strip, eliminate internal stress, and provide a good foundation for subsequent surface treatment. The subsequent shot blasting is a mechanical cleaning method that uses high-speed abrasives to impact the surface of the steel strip, which can effectively remove scale, rust and other attachments on the surface of the steel strip, and strengthen the surface at the same time. This is crucial to improving the surface quality of the steel strip and helps to deal with potential defects on the edge of the steel strip. The final surface pickling treatment, as the finishing step of the entire pretreatment process, is used to thoroughly remove fine particles, oxides or dirt that may remain after shot blasting, ensuring that the surface of the steel strip reaches a highly clean state and providing ideal surface conditions for subsequent electromagnetic induction heating and rolling.

[0015] The rolling process of the silicon steel strip, wherein the normalizing treatment is a two-stage normalizing treatment, and the feeding speed is 10 meters per minute.

[0016] The rolling process of the silicon steel strip, wherein in step S3, the process parameters of the electromagnetic induction heating include: a feeding speed of 30 m / min, a heating temperature of 165-175°C for the first and last 40 m of the steel strip, and a heating temperature of 145-155°C for the remaining strip.

[0017] In the rolling process of the silicon steel strip, the process parameters of the electromagnetic induction heating also include: the winding tension is 5900 kg.

[0018] In the rolling process of the silicon steel strip, in step S4, the process parameters of the insulation heating include: the insulation heating temperature is 175-185° C., and the insulation time is 10-14 hours.

[0019] In the rolling process of the silicon steel strip, the box-type insulation furnace is provided with heating resistors on the surrounding furnace walls and the base to heat and insulate the steel coil.

[0020] The silicon steel strip rolling process, wherein step S5 comprises:

[0021] S51. The steel coil after heat preservation and heating is coiled by a coiler of a cold rolling mill, and then subjected to high temperature aging rolling.

[0022] The rolling process of the silicon steel strip, wherein the specification of the hot-rolled coil is 2.3*1090mm.

[0023] In a second aspect, the present application further provides an application of the rolling process for silicon steel strips as provided in the first aspect, wherein the steel coils processed by the rolling process are used to make the iron core of a transformer.

[0024] This application involves applying the steel coils produced through the aforementioned specific rolling process to the manufacture of transformer cores, which have stringent material performance requirements. This rolling process, particularly the introduction of electromagnetic induction heating and box-type insulation heating, positively impacts the steel strip's microstructure, grain orientation, and ultimate magnetic properties. This results in the resulting steel coils outperforming conventional processes in key performance indicators such as magnetic induction and iron loss. This also effectively reduces the waste of raw materials caused by trimming, effectively reducing the material cost of transformer cores by using less raw material to produce the same amount of transformer core.

[0025] From the above, it can be seen that the present application provides a rolling process for silicon steel strip and its application, wherein the rolling process of the present application introduces a combined heat treatment link of electromagnetic induction heating and box-type insulation furnace insulation heating after normalizing pickling treatment and before rolling treatment, so that the untrimmed steel strip has sufficient plasticity and toughness at the rolling temperature, and can withstand rolling stress without cracking. It solves the problems of raw material waste, reduced yield, increased cost, and burr-induced cracking defects caused by trimming in conventional silicon steel strip rolling processes, and improves material utilization and product quality stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A flow chart of a silicon steel strip rolling process provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work fall within the scope of protection of the present application.

[0028] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0029] First, please refer to Figure 1 Some embodiments of the present application provide a silicon steel strip rolling process for cold rolling the silicon steel strip. The rolling process includes the following steps:

[0030] S1, prepare hot rolled coil;

[0031] S2, uncoiling the hot rolled coil to form a steel strip, and performing normalizing pickling treatment on the steel strip;

[0032] S3, performing electromagnetic induction heating on the steel strip after normalizing pickling treatment, and winding it into a steel coil;

[0033] S4. Using a box-type holding furnace to heat the steel coil;

[0034] S5. Rolling the steel coil after heat preservation and heating.

[0035] Specifically, normalizing pickling treatment refers to heat treatment and surface cleaning of the steel strip, which can be achieved by using a continuous normalizing furnace combined with a pickling tank. It is used to improve the structure of the steel strip, remove surface oxides and dirt, and provide a clean surface for subsequent processing.

[0036] More specifically, electromagnetic induction heating refers to a heating method that uses an electromagnetic field to generate eddy currents within the steel strip, which are converted into heat energy. This can be achieved using an induction coil configured with a high-frequency power supply, for example, by passing the steel strip through an inductor. Its primary purpose is to quickly increase the temperature of the steel strip. In the present embodiment, the electromagnetic induction heating treatment in step S3 is preferably implemented using a welding preheating unit.

[0037] More specifically, a box-type holding furnace is a closed chamber designed to keep steel coils warm for extended periods of time. It can use either resistance wire or gas burners as heating elements. Holding heating involves maintaining the temperature of the steel coils at a constant level for a period of time. This process is accomplished by placing the steel coils in a holding furnace and controlling the temperature within the furnace to fully soften the internal structure and improve their plasticity.

[0038] More specifically, rolling processing refers to the process of using a rolling mill to plastically deform the steel strip to reduce its thickness. It can be achieved using a multi-roll rolling mill. For example, pressure is applied to the steel strip by the rolls of a cold rolling mill to achieve thinning and performance adjustment of the steel strip. In the embodiment of the present application, a 20-roll cold rolling mill is preferably used.

[0039] Specifically, the process flow of this application is as follows: first, hot-rolled coils are prepared as the starting material. Subsequently, the hot-rolled coils are unwound to form a continuous steel strip, which is then subjected to a normalizing pickling treatment to improve material properties and clean the surface. Next, the normalizing pickling steel strip is subjected to electromagnetic induction heating to rapidly raise the strip temperature, and then it is wound into a steel coil. The electromagnetic induction heating in this step provides the base temperature for the subsequent insulation treatment. The wound steel coil is then transferred to a box-type insulation furnace for long-term insulation heating. The box-type insulation furnace uses heating elements located on the furnace walls and base to uniformly and thoroughly heat and insulate the steel coil, ensuring that the desired temperature is reached and maintained throughout the entire volume of the steel coil. This long, uniform insulation treatment allows the steel strip, especially those with defects at the edges, to be fully softened and stress-relieving in the microstructure, significantly improving the material's plasticity and toughness at subsequent rolling temperatures. Finally, the heated steel coil is rolled. Because the pre-process heat treatment significantly improves the plasticity of the steel strip, even if tiny cracks or irregular shapes are present on the strip edges during hot rolling or normalizing pickling, the material is better able to plastically deform during rolling to adapt to the pressure and tensile stress of the rolls, rather than experiencing brittle fracture or crack propagation. By optimizing the heat treatment process, the entire process can successfully and stably complete the rolling of silicon steel strip without the conventional edge trimming process, thus avoiding the material loss and defects caused by edge trimming.

[0040] The rolling process of the present application introduces a combined heat treatment step of electromagnetic induction heating and box-type holding furnace insulation heating after normalizing pickling treatment and before rolling treatment, so that the untrimmed steel strip has sufficient plasticity and toughness at the rolling temperature and can withstand rolling stress without cracking. It solves the problems of raw material waste, reduced yield, increased cost and burr-induced cracking defects caused by trimming in conventional silicon steel strip rolling processes, thereby improving material utilization and product quality stability.

[0041] In some preferred embodiments, in step S2, the normalizing pickling treatment includes: normalizing treatment, shot blasting treatment and surface pickling treatment performed in sequence.

[0042] Specifically, normalizing treatment refers to a heat treatment process in which the steel strip is heated to above the critical temperature and maintained for a period of time, and then cooled appropriately to obtain a uniform fine-grained structure, eliminate internal stress and improve plasticity. It can be achieved using equipment such as a continuous normalizing furnace. Shot blasting treatment refers to a process in which a high-speed abrasive stream is used to impact the surface of the steel strip, and surface attachments, scale, rust, etc. are removed by mechanical action, and the surface is strengthened. It can be achieved using equipment such as crawler shot blasting machines and suspended shot blasting machines, using abrasives such as steel shots and steel grit. Surface pickling treatment refers to a process in which an acidic solution is used to chemically react with oxides and dirt on the surface of the steel strip to dissolve or peel them off, thereby obtaining a clean surface. It can be achieved by immersion pickling, spray pickling, etc.

[0043] More specifically, normalizing treatment, as the first step, aims to improve the internal structure of the steel strip, eliminate internal stress, and provide a good foundation for subsequent surface treatment. The subsequent shot blasting is a mechanical cleaning method that uses high-speed abrasives to impact the surface of the steel strip, effectively removing scale, rust, and other attachments on the surface of the steel strip, while strengthening the surface. This is crucial for improving the surface quality of the steel strip and helps to deal with potential defects on the edge of the steel strip. The final surface pickling treatment, as the finishing step of the entire pretreatment process, is used to thoroughly remove fine particles, oxides, or dirt that may remain after shot blasting, ensuring that the surface of the steel strip reaches a highly clean state and providing ideal surface conditions for subsequent electromagnetic induction heating and rolling.

[0044] More specifically, by performing normalizing treatment, shot blasting treatment and surface pickling treatment in sequence, the rolling process of the present application can thoroughly remove the oxide scale, rust and dirt on the surface of the steel strip, improve the surface quality of the steel strip, effectively deal with defects on the edge of the steel strip, and provide a clean and well-structured substrate for subsequent electromagnetic induction heating and rolling, thereby ensuring the quality of the final silicon steel strip product.

[0045] In some preferred embodiments, the normalizing treatment is a two-stage normalizing treatment, and the feeding speed is 10 m / min.

[0046] Specifically, two-stage normalization involves dividing the normalization process into at least two distinct stages, each of which can be performed under different temperature, atmosphere, or time conditions. This segmented approach allows for more precise control over the heating, holding, and cooling processes of the steel strip, thereby better regulating the structural transformation within the strip. This segmented control can more effectively promote grain growth, homogenize chemical composition, eliminate work hardening and internal stresses, and potentially form a more ideal phase composition and crystal structure.

[0047] More specifically, the feeding speed is limited to 10 m / min, ensuring that the steel strip can obtain sufficient processing time in each normalizing stage to complete the expected structural transformation.

[0048] In some preferred embodiments, in step S3, the process parameters of electromagnetic induction heating include: a feeding speed of 30 m / min, a heating temperature of the first and last 40 m of the steel strip of 165-175° C., and preferably 170° C., and a heating temperature of the remaining strip of 145-155° C., and preferably 150° C.

[0049] Specifically, among the above-mentioned process parameters, by adopting a relatively high heating temperature for the first and last 40 meters of the steel strip, the possible heat dissipation difference or state difference between the first and last sections is compensated, which helps to ensure the temperature uniformity of the entire roll of steel strip. Setting a specific temperature range for the remaining part of the strip not only ensures the heating effect, but also avoids overheating, helps to control energy consumption, and provides a suitable temperature basis for subsequent insulation and rolling. This method of setting different heating temperatures for different sections realizes precise temperature control in sections, and improves the uniformity and efficiency of heating. The limitation of this parameter enables the technical means of electromagnetic induction heating to play a more optimized role in the entire rolling process, provides a better temperature basis for subsequent insulation and rolling, and thus improves the stability of the entire process and product quality. Precise temperature control in sections improves the uniformity and efficiency of heating.

[0050] In some preferred embodiments, the process parameters of electromagnetic induction heating also include: a winding tension of 5900 kg, and a whole roll staggering controlled within 5 mm after winding.

[0051] Specifically, among the aforementioned process parameters, controlling the winding tension at 5900 kg ensures uniform tension on the steel strip during winding, preventing stress concentration. Furthermore, by controlling the stagger within 5 mm throughout the coil after winding, the steel strip edges are aligned, minimizing edge damage and resulting in a neatly curled edge. This combined tension control and centering control ensures a stable coil shape and uniform internal stress distribution. This stable coil shape and stress state provide the foundation for subsequent box-type insulation heating, ensuring uniform heat transfer within the coil.

[0052] Furthermore, neatly curled edges and a stable coil shape provide optimal conditions for subsequent rolling, reducing defects during the rolling process. This control of key parameters in the coiling process complements the preceding electromagnetic induction heating step, providing a foundation for subsequent holding heating and rolling processes, and ultimately improving the final silicon steel strip product quality.

[0053] In some preferred embodiments, in step S4, the process parameters of the heat preservation and heating include: the heat preservation and heating temperature is 175-185° C., and preferably 180° C., and the heat preservation time is 10-14 hours, and preferably 12 hours.

[0054] Specifically, the present application solves the problem of poor insulation effect caused by improper insulation heating parameters, which in turn affects the subsequent rolling quality and product performance, by limiting the specific process parameters for insulation heating of the steel coil in step S4. Specifically, the insulation heating temperature is limited to 175-185°C, and preferably 180°C. This specific temperature range is set when the steel coil is insulation treated in a box-type insulation furnace in order to effectively promote the release of internal stress of the steel coil and the homogenization of the organizational state, thereby avoiding the adverse effects that may be caused by excessively high or low temperatures. At the same time, the insulation time is limited to 10-14 hours, and preferably 12 hours. This specific time range ensures that at the set temperature, the steel coil has enough time to complete the required internal transformation, thereby ensuring the adequacy of the insulation treatment and avoiding energy waste and reduced efficiency caused by insufficient insulation time or excessive insulation time. By coordinating the insulation heating temperature and time, this solution ensures that the steel coil is in the best condition before entering the subsequent rolling process, laying the foundation for obtaining high-quality silicon steel strip products.

[0055] More specifically, precise control of temperature and duration allows for the effective release of residual stress within the coil, while promoting the homogenization of the internal structure of the coil. Too low a temperature may lead to insufficient stress release and incomplete structural transformation; too high a temperature may cause unnecessary grain growth or other adverse phase changes. Insufficient duration results in incomplete insulation, while excessive duration increases energy consumption without significant improvement. Therefore, by precisely limiting the insulation heating temperature and duration to a specific range, it is ensured that the coil reaches the ideal internal state before entering the subsequent rolling process, thereby coordinating with subsequent rolling processing steps to jointly improve the quality and performance of the final silicon steel strip.

[0056] In some preferred embodiments, the box-type insulation furnace is provided with heating resistors on the surrounding furnace walls and the base to heat and insulate the steel coil.

[0057] Specifically, a heating resistor is an element that converts electrical energy into thermal energy, and can be implemented in the form of resistance wire, electric heating tube, ceramic heater, etc. The rolling process of this application is configured through the four sides of the furnace wall and the base, which means that the heating resistors are installed on the four side walls and the bottom of the box-type holding furnace to form a multi-directional heat source layout.

[0058] More specifically, since the heating resistors are arranged on the four side walls and bottom of the furnace body, heat can be transferred to the steel coil located in the center of the furnace body from multiple directions at the same time. The heat from the four sides of the furnace wall acts on the sides of the steel coil mainly through radiation and convection, while the heat from the base acts on the bottom of the steel coil mainly through radiation and conduction. Compared with single-direction or local heating, this multi-directional, three-dimensional heating layout can more effectively establish a uniform temperature field. Heat can penetrate into the interior of the steel coil more quickly, reducing the temperature difference between the inside and outside of the steel coil and avoiding overheating or insufficient heating in local areas. In this way, the overall temperature of the steel coil tends to be consistent, providing raw materials with uniform temperature for subsequent rolling processing, thereby ensuring the stability of the rolling process and the quality of the final product.

[0059] In some preferred embodiments, step S5 includes:

[0060] S51. The steel coil after heat preservation and heating is coiled by a coiler of a cold rolling mill, and then subjected to high temperature aging rolling.

[0061] Specifically, under normal circumstances, the steel coil rolling starts from the uncoiler for the first rolling, and passes through the uncoiler's automatic EPC correction and centering components, the entrance pressure plate and the side guide rollers in turn. The steel strip that is not trimmed may be scratched by the side guide rollers at the entrance.

[0062] More specifically, this solution addresses the problem that the edges of the steel strip are easily damaged by the side guide rollers during the rolling process of the heat-insulating heated steel coils, and proposes an improved rolling process step. Specifically, this step is no longer a direct rolling process, but is refined to first perform a special coiling process, and then perform normal rolling. By using the coiling machine of the cold rolling unit to perform a coiling process on the heat-insulating heated steel coils before formal rolling, its core function is to adjust the state or path of the steel strip entering the rolling mill, so as to avoid damage to the edges of the steel strip caused by the side guide rollers. This pretreatment operation changes the relative position or contact mode of the steel strip and the side guide rollers, effectively protecting the integrity of the edges of the steel strip. Furthermore, in the previous process, the steel coil is wound using a 5900kg winding tension in the welded preheating unit. This effectively prevents the steel strip from straying from the rolling centerline during coiling on the coiler. After completing this special coiling process and ensuring edge protection, normal high-temperature aging rolling is performed according to established process parameters, ensuring smooth subsequent rolling and product quality. This addition of a pretreatment step to the existing process solves a technical challenge in a specific link using existing equipment, making the entire rolling process more reliable.

[0063] More specifically, high-temperature aging rolling refers specifically to rolling deformation performed at a specific temperature (the aforementioned holding heating temperature, such as 180°C) combined with the aging effect. Its essence is the synergistic effect of thermal energy, mechanical energy and time dependence. The high temperature actually corresponds to the medium and low temperature plasticity window, that is, it is strictly controlled at the holding heating temperature; the prerequisite for aging is that the steel coil evolves under the aforementioned holding time (such as 12 hours) to utilize the rolling force to drive the continuous interaction between dislocations and solute atoms, forming a "rolling-relaxation" cycle to make the deformation uniform.

[0064] More specifically, by adding a coiling process before normal rolling, the present invention effectively prevents damage to the edges of the steel strip when passing through the side guide rollers. This protects the integrity of the steel strip edges, reduces the occurrence of defects such as cracks, and improves product quality and yield rate.

[0065] In some preferred embodiments, the specification of the hot rolled coil is 2.3*1090 mm.

[0066] Specifically, the specifications of a hot-rolled coil refer to the thickness and width of the steel strip unrolled from the steel coil formed after hot rolling. 2.3*1090mm means that the thickness of the steel strip unrolled from the steel coil is 2.3 mm and the width is 1090 mm.

[0067] In a second aspect, some embodiments of the present application further provide an application of a rolling process based on the silicon steel strip provided in the first aspect, wherein the steel coil processed by the rolling process is used to make the iron core of a transformer.

[0068] The working principle of this solution is to apply the steel coils obtained through the aforementioned specific rolling process to the manufacture of transformer cores with strict material performance requirements. The aforementioned rolling process, especially the introduction of electromagnetic induction heating and box-type insulation heating, can have a positive impact on the microstructure, grain orientation, and ultimate magnetic properties of the steel strip, such as improving heating uniformity, promoting stress release, and structural homogenization. As a result, the resulting steel coils exhibit superior characteristics in key performance indicators such as magnetic induction and iron loss compared to conventional processes. It also effectively reduces the waste of raw materials caused by trimming, which is equivalent to using less raw materials to produce the same amount of transformer core, thereby effectively reducing the material cost of the transformer core.

[0069] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A silicon steel strip rolling process for cold rolling a silicon steel strip, characterized in that: The steps of the rolling process include: S1, prepare hot rolled coil; S2, uncoiling the hot-rolled coil to form a steel strip, and performing normalizing pickling treatment on the steel strip; S3, performing electromagnetic induction heating on the steel strip after normalizing pickling treatment, and winding it into a steel coil; S4, using a box-type insulation furnace to heat the steel coil; S5. Rolling the steel coil after heat preservation and heating.

2. The rolling process of silicon steel strip according to claim 1, characterized in that: In step S2, the normalizing pickling treatment includes: normalizing treatment, shot blasting treatment and surface pickling treatment performed in sequence.

3. The rolling process of silicon steel strip according to claim 2, characterized in that: The normalizing treatment is a two-stage normalizing treatment, and the feeding speed is 10 m / min.

4. The rolling process of silicon steel strip according to claim 1, characterized in that: In step S3, the process parameters of electromagnetic induction heating include: a feeding speed of 30 m / min, a heating temperature of 165-175° C. for the first and last 40 m of the steel strip, and a heating temperature of 145-155° C. for the remaining strip.

5. The silicon steel strip rolling process according to claim 4, characterized in that: The process parameters of electromagnetic induction heating also include: winding tension is 5900kg.

6. The silicon steel strip rolling process according to claim 1, characterized in that: In step S4, the process parameters of the heat preservation and heating include: the heat preservation and heating temperature is 175-185° C., and the heat preservation time is 10-14 hours.

7. The silicon steel strip rolling process according to claim 1, characterized in that: The box-type heat preservation furnace is provided with heating resistors on the surrounding furnace walls and the base to heat and insulate the steel coil.

8. The silicon steel strip rolling process according to claim 1, characterized in that: Step S5 includes: S51, using a coiler of a cold rolling mill to coil the steel coil after heat preservation and heating, and then performing high temperature aging rolling.

9. The silicon steel strip rolling process according to claim 1, characterized in that: The specification of the hot rolled coil is 2.3*1090mm.

10. An application of the rolling process for silicon steel strip according to any one of claims 1 to 9, characterized in that: The steel coils produced by this rolling process are used to make the core of transformers.

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