Method for producing general oriented silicon steel by eighteen-roller single stand

Abstract

The application provides a method for producing general oriented silicon steel by using an eighteen-roller single-stand, which comprises the following steps: obtaining a hot-rolled and pickled plate; performing first cold rolling on the hot-rolled and pickled plate to obtain a first cold-rolled plate, wherein the first cold rolling comprises four passes of rolling; performing decarburization annealing on the first cold-rolled plate and then performing second cold rolling to obtain a second cold-rolled plate, wherein the second cold rolling comprises two passes of rolling; wherein the first cold rolling and the second cold rolling are performed by using an eighteen-roller single-stand unit; and performing magnesium oxide coating, high-temperature annealing-insulation layer coating, tensile flattening annealing, laser marking treatment on the second cold-rolled plate to obtain the general oriented silicon steel. According to the application, the eighteen-roller single-stand is used to control the reduction rate, tension and stringing value of each pass during the first cold rolling and the second cold rolling, so that qualified cold-rolled silicon steel products can be stably produced, wherein the longitudinal thickness deviation of the general oriented silicon steel products is controlled within +0.002 mm, the transverse same-plate difference is controlled within 0.008 mm or less, and the plate shape is good.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of steel processing, and particularly relates to a method for producing conventional grain-oriented silicon steel by using an eighteen-roller single-stand. BACKGROUND

[0002] Grain-oriented silicon steel is an important soft magnetic alloy, and is mainly used for manufacturing transformers, motors, compressors and the like. Due to the particularity of punching and stacking of the product in the processing process, in addition to high magnetic induction and low iron loss of the silicon steel product, a high stacking coefficient is also required, and the smooth surface, good plate shape and uniform thickness of the silicon steel sheet are important factors for ensuring the high stacking coefficient of the iron core. The grain-oriented silicon steel can be divided into conventional grain-oriented silicon steel (CGO) and high permeability grain-oriented silicon steel (Hi-B) according to the preparation process and magnetic properties.

[0003] The prior art usually uses a four-roller single-stand rolling mill, a six-roller single-stand rolling mill or a twenty-roller single-stand rolling mill to produce the grain-oriented silicon steel, but the production method of the prior art is prone to unstable rolling, which is not conducive to the stable production of the conventional grain-oriented silicon steel. SUMMARY

[0004] The embodiment of the application provides a method for producing conventional grain-oriented silicon steel by using an eighteen-roller single-stand, so as to improve the stability of the production of the conventional grain-oriented silicon steel product.

[0005] The method for producing general grain-oriented silicon steel provided by the embodiments of the present application comprises the following steps: obtaining a hot-rolled pickled plate; performing first cold rolling on the hot-rolled pickled plate to obtain a first cold-rolled plate, wherein the first cold rolling comprises four passes, and each pass comprises the following parameters: a first-pass reduction of 27% to 33%, an inlet tension of 100 to 140 KN, an outlet tension of 210 to 270 KN, a rolling force of 7000 to 10000 KN, and a string roll of 40 to 100 mm; a second-pass reduction of 24% to 29%, an inlet tension of 150 to 190 KN, an outlet tension of 180 to 230 KN, a rolling force of 6500 to 1000 KN, and a string roll of 40 to 100 mm; a third-pass reduction of 23% to 28%, an inlet tension of 110 to 150 KN, an outlet tension of 130 to 180 KN, a rolling force of 6500 to 1000 KN, and a string roll of 40 to 100 mm; and a fourth-pass reduction of 23% to 28%, an inlet tension of 70 to 110 KN, an outlet tension of 110 to 160 KN, a rolling force of 6000 to 9000 KN, and a string roll of 40 to 100 mm; performing decarburization annealing on the first cold-rolled plate and then performing second cold rolling to obtain a second cold-rolled plate, wherein the second cold rolling comprises two passes, and each pass comprises the following parameters: a first-pass reduction of 35% to 42%, an inlet tension of 50 to 80 KN, an outlet tension of 60 to 100 KN, a rolling force of 5000 to 8000 KN, and a string roll of 40 to 100 mm; and a second-pass reduction of 30% to 36%, an inlet tension of 40 to 70 KN, an outlet tension of 50 to 90 KN, a rolling force of 5000 to 8000 KN, and a string roll of 40 to 100 mm; wherein the first cold rolling and the second cold rolling are performed by using an eighteen-roll single-stand unit; and performing magnesium oxide coating, high-temperature annealing, insulation layer coating, tensile leveling annealing, laser marking treatment on the second cold-rolled plate to obtain the general grain-oriented silicon steel.

[0006] Optionally, the step of obtaining the hot-rolled pickled plate comprises the following steps: obtaining a hot-rolled steel plate; and controlling the hot-rolled steel plate to be pickled in five pickling tanks, wherein the pickling speed satisfies v≤60 m / min, the acid solution temperature T satisfies 75℃ to 90℃, the acid solution concentration of the first pickling tank satisfies 100 g / L to 160 g / L, the acid solution concentrations of the second pickling tank, the third pickling tank and the fourth pickling tank are independently 170 g / L to 230 g / L, and the acid solution concentration of the fifth pickling tank satisfies 260 g / L to 330 g / L.

[0007] Optionally, the thickness of the hot-rolled pickled plate is 2.0 to 3.0 mm, and the width is 1000 to 1300 mm; and the thickness of the first cold-rolled plate is 0.6 to 0.64 mm.

[0008] Optionally, the total reduction of the first cold rolling is 70% to 80%.

[0009] Optionally, the thickness of the second cold-rolled plate is 0.24 to 0.27 mm.

[0010] Optionally, the total reduction rate of the secondary cold rolling is 55% to 65%.

[0011] Optionally, the eighteen-roller single stand includes an intermediate roller having a tapered roller with a first taper and a second taper, and a work roller arranged on the first side of the intermediate roller and in contact with the intermediate roller, the work roller being used for rolling the steel material to be rolled, and the intermediate roller being able to shift in the axial direction thereof during rolling.

[0012] Optionally, the taper length L1 of the I region corresponding to the first taper of the intermediate roller is 300mm to 450mm, and the taper length L2 of the II region corresponding to the second taper of the intermediate roller is 50mm to 100mm.

[0013] Optionally, the taper height H1 of the I region corresponding to the first taper of the intermediate roller is 1mm to 3mm, and the taper height H2 of the II region corresponding to the second taper of the intermediate roller is 0.02mm to 0.09mm.

[0014] Optionally, at least one of the work roller and the intermediate roller satisfies: roughness≥1.0um.

[0015] Compared with the prior art, the present application has at least the following beneficial effects:

[0016] The eighteen-roller single stand provided by the embodiments of the present application can stably produce qualified cold-rolled silicon steel products by setting the pass reduction rate, the pass tension, and the pass string roller value of the eighteen-roller single stand during primary cold rolling and secondary cold rolling, wherein the longitudinal thickness deviation of the ordinary oriented silicon steel product is controlled within +0.002mm, the transverse same plate difference is controlled within ≤0.008mm, and the plate shape is good. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows, and other drawings can also be obtained by those of ordinary skill in the art without creative labor on the premise that the drawings are not attached.

[0018] Figure 1 is a structural schematic diagram of the intermediate roller provided by the embodiments of the present application;

[0019] I, the I region corresponding to the first taper of the tapered roller of the intermediate roller; II, the II region corresponding to the first taper of the tapered roller of the intermediate roller. DETAILED DESCRIPTION

[0020] The features and exemplary embodiments of the various aspects of the present application will be described in detail below with reference to the drawings. For the purpose of clarity, the description is divided into the following sections: technical scheme, advantages, and specific embodiments. It should be understood that the specific embodiments described herein are intended to explain the present application, but not to limit the present application. The present application can be implemented without some of the specific details described below. The following description of the embodiments is merely intended to provide a better understanding of the present application by showing examples of the present application.

[0021] It should be noted that the relative terms such as first and second, and the like are used herein only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between such entities or operations. Moreover, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or apparatus that includes a list of elements not only includes those elements, but also includes other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, the elements defined by the statement "comprising" do not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the elements.

[0022] The prior art generally uses four-roller single-stand rolling mills, six-roller single-stand rolling mills, and twenty-roller single-stand rolling mills to produce oriented silicon steel, but the inventors of the present application have noticed that in actual production, the work roll diameter of the twenty-roller rolling mill is small, so the risk of slip increases when rolling oriented silicon steel, which affects the stable production of the rolling mill, and the rolling force of the four-roller and six-roller rolling mills is too large, which is also not conducive to the stable production of oriented silicon steel.

[0023] To solve the problems of the prior art, the embodiments of the present application provide an eighteen-roller single-stand method for producing ordinary oriented silicon steel. First, the eighteen-roller single-stand method for producing ordinary oriented silicon steel provided by the embodiments of the present application will be introduced.

[0024] The eighteen-roller single-stand method for producing ordinary oriented silicon steel provided by the embodiments of the present application comprises:

[0025] Obtaining a hot-rolled pickled plate;

[0026] The hot-rolled pickled plate is subjected to one cold rolling to obtain a one cold rolled plate, the one cold rolling includes 4 passes of rolling, the 4 passes of rolling include: the first pass of 27% to 33% reduction, an inlet tension of 100 to 140 KN, an outlet tension of 210 to 270 KN, a rolling force of 7000 to 10000 KN, and a string roller of 40 to 100 mm; the second pass of 24% to 29% reduction, an inlet tension of 150 to 190 KN, an outlet tension of 180 to 230 KN, a rolling force of 6500 to 1000 KN, and a string roller of 40 to 100 mm; the third pass of 23% to 28% reduction, an inlet tension of 110 to 150 KN, an outlet tension of 130 to 180 KN, a rolling force of 6500 to 1000 KN, and a string roller of 40 to 100 mm; and the fourth pass of 23% to 28% reduction, an inlet tension of 70 to 110 KN, an outlet tension of 110 to 160 KN, a rolling force of 6000 to 9000 KN, and a string roller of 40 to 100 mm;

[0027] The one cold rolled plate is subjected to decarburization annealing and then subjected to two cold rolling to obtain a two cold rolled plate, the two cold rolling includes 2 passes of rolling, the 2 passes of rolling include: the first pass of 35% to 42% reduction, an inlet tension of 50 to 80 KN, an outlet tension of 60 to 100 KN, a rolling force of 5000 to 8000 KN, and a string roller of 40 to 100 mm; and the second pass of 30% to 36% reduction, an inlet tension of 40 to 70 KN, an outlet tension of 50 to 90 KN, a rolling force of 5000 to 8000 KN, and a string roller of 40 to 100 mm;

[0028] The one cold rolling and the two cold rolling are performed by using an eighteen-roller single stand unit.

[0029] The two cold rolled plate is subjected to magnesium oxide coating, high temperature annealing, insulation layer coating, tensile leveling annealing and laser marking treatment to obtain a general oriented silicon steel.

[0030] According to the embodiments of the present application, the change of the tension can significantly change the rolling pressure, the large tension rolling is one of the advantages of the eighteen single stand, which is beneficial to reduce the rolling force, makes the rolling process more stable, and the strip is not easy to break in the rolling process. At the same time, with the thickness reduction at the rolling outlet, due to the large plastic stiffness of the rolled piece, the thickness control by adjusting the roll gap alone has a poor effect, the thickness control by changing the tension is more rapid and effective, and the thickness precision of the steel strip can be improved.

[0031] The embodiments of the present application can stably produce qualified cold rolled silicon steel products by setting the reduction rate, the tension and the string roller value of each pass in the one cold rolling and the two cold rolling, wherein the longitudinal thickness deviation of the general oriented silicon steel product is controlled within +0.002 mm, the transverse same plate difference is controlled within ≤0.008 mm, and the plate shape is good.

[0032] The method provided by the embodiments of the application can be widely applied to domestic or imported eighteen-roller single-stand production of cold-rolled silicon steel products, and will be beneficial to the domestication and application of the eighteen-roller single-stand.

[0033] The hot-rolled pickled plate is obtained through a steelmaking-continuous casting-hot rolling-pickling process.

[0034] In some embodiments, the step of obtaining the hot-rolled pickled plate comprises: obtaining a hot-rolled steel plate, and controlling the hot-rolled steel plate to be subjected to pickling treatment through five pickling tanks, wherein the pickling speed satisfies v≤60 m / min, the acid solution temperature T satisfies 75℃-90℃, the acid solution concentration of the first pickling tank satisfies 100 g / L-160 g / L, the acid solution concentrations of the second pickling tank, the third pickling tank and the fourth pickling tank are independently 170 g / L-230 g / L, and the acid solution concentration of the fifth pickling tank satisfies 260 g / L-330 g / L.

[0035] The inventors of the application find that, since the heating temperature of the oriented silicon steel is relatively high (above 1290℃) during hot rolling, Si and Fe are prone to form layered Fe2SiO4 between the oxide scale and the steel base, so that the adhesion of the oxide scale is strong and it is difficult to remove, and a separate pickling process needs to be developed. The embodiments of the application adjust the pickling speed of the hot-rolled steel plate of the oriented silicon steel, and perform pickling treatment at a relatively small speed, and at the same time, five pickling tanks are used during pickling, and the acid solution concentration of the pickling tank is increased, so that secondary pickling is not needed, and only one pickling can achieve a good pickling effect.

[0036] Exemplarily, the pickling speed is 45 m / min, 48 m / min, 50 m / min, 53 m / min, 53 m / min or 55 m / min.

[0037] Exemplarily, the acid solution concentration of the first pickling tank can be 100 g / L, 110 g / L, 120 g / L, 130 g / L, 140 g / L or 150 g / L.

[0038] Exemplarily, the acid solution concentration of the second pickling tank can be 170 g / L, 180 g / L, 190 g / L, 200 g / L, 210 g / L or 220 g / L.

[0039] Exemplarily, the acid solution concentration of the third pickling tank can be 170 g / L, 180 g / L, 190 g / L, 200 g / L, 210 g / L or 220 g / L.

[0040] Exemplarily, the acid solution concentration of the fourth pickling tank can be 170 g / L, 180 g / L, 190 g / L, 200 g / L, 210 g / L or 220 g / L.

[0041] Exemplarily, the fifth pickling tank has a liquid acid concentration of 260 g / L, 270 g / L, 280 g / L, 290 g / L, 300 g / L, 310 g / L or 320 g / L.

[0042] The subsequent processes are performed according to the conventional method, which is not different from the production of general oriented silicon steel by other single-stand, and thus is not described herein.

[0043] In some embodiments, the hot-rolled pickling plate has a thickness of 2.0-3.0 mm and a width of 1000-1300 mm, and the once cold-rolled plate has a thickness of 0.6-0.64 mm.

[0044] The eighteen-roller single-stand working roller has a roller diameter of 140-170 mm, and the small roller diameter and small harmful contact surface of the strip steel are conducive to reducing the edge drop of the strip steel and improving the same-plate difference. Meanwhile, the large stringing value is conducive to improving the same-plate difference.

[0045] In some embodiments, the total reduction rate of the once cold-rolled plate is 70%-80%. If the reduction rate of the once cold-rolled plate is too small, the grain size is not uniform, the content of the beneficial texture {111}〈112〉 and {411}〈148〉 of the subsequent decarburization annealed plate is low, and the Goss ({110}〈001〉) texture after the subsequent high-temperature annealing is difficult to generate. If the reduction rate of the once cold-rolled plate is too large, the subsequent high-temperature secondary recrystallized Goss grains are difficult to grow fully. When the deformation amount of the once cold-rolled plate exceeds 80%, the {111}〈112〉 texture rotates to the {111}〈110〉 texture, which is not conducive to the growth of the secondary recrystallized Goss. Meanwhile, the small grains in the secondary recrystallized structure increase, and the secondary recrystallization is incomplete. Therefore, the reduction rate of the once cold-rolled plate is set to 70%-80% in consideration of the above factors.

[0046] In some embodiments, the thickness of the secondary cold-rolled plate is 0.24-0.27 mm.

[0047] In some embodiments, the total reduction rate of the secondary cold-rolled plate is 55%-65%. When the reduction rate of the secondary cold-rolled plate is 55%-65%, the beneficial texture {111}〈112〉 is formed, which is conducive to the Goss texture. When the reduction rate exceeds this range, the Goss texture {110}〈001〉 rotates along the ND axis to become the brass orientation {110}〈112〉, which causes the magnetic property to deteriorate.

[0048] In some embodiments, the eighteen-roller single-stand includes a middle roller having a first taper and a second taper, and a working roller arranged on the first side of the middle roller and in contact with the middle roller, the working roller being used for rolling the steel to be rolled, and the middle roller moves along the axial direction of the middle roller during the rolling process.

[0049] In the method for rolling a steel product by a single-stand rolling mill in the application, the first side of the intermediate roller, i.e. the side of the intermediate roller close to the steel material to be rolled, is provided with the work roller to form a passage for the steel material arranged oppositely above and below, the work roller is driven by the intermediate roller to roll the steel material, the intermediate roller is the driving roller, and the work roller is the driven roller; the work roller is driven by the driving roller and the steel material between the upper and lower work rollers to roll the steel material.

[0050] The improvement of the transverse thickness difference of the intermediate roller is mainly caused by the influence of the taper contact value, but the greater the taper contact value, the greater the central reduction and the central extension, and the more likely to produce the central wave.

[0051] The increase of the taper height of the intermediate roller effectively reduces the contact of the edge of the work roller, reduces the contact pressure of the edge of the work roller, reduces the deformation of the brain area of the work roller, and weakens the edge drop phenomenon at the outlet of the rolled piece, which is beneficial to improve the transverse thickness difference. At the same time, the edge extension is reduced, the extension of the rolled piece along the width direction tends to be more uniform, and the contact pressure and rolling force of the intermediate flat roller area are increased.

[0052] In some embodiments, the taper length L1 of the I area corresponding to the first taper of the intermediate roller is 300mm-450mm, and the taper length L2 of the II area corresponding to the second taper of the intermediate roller is 50mm-100mm.

[0053] In some embodiments, the taper height H1 of the I area corresponding to the first taper of the intermediate roller is 1mm-3mm, and the taper height H2 of the II area corresponding to the second taper of the intermediate roller is 0.02mm-0.09mm.

[0054] The eighteen-roller single-stand intermediate roller adopts a two-section type different slope taper roller type, which reduces the inter-roller contact stress concentration at the taper corner, enhances the adjustment effect of roll shifting, eliminates the sharp elastic flattening and elastic deformation of the edge of the roller system, and is beneficial to improve the transverse thickness difference and the edge shape quality of the plate.

[0055] In some embodiments, at least one of the work roller and the intermediate roller satisfies: roughness≥1.0um. The roughness is appropriately large, which is beneficial to the single-stand rolling process without slipping.

[0056] In some embodiments, in the steps of primary rolling and secondary rolling, the concentration of the emulsion of the eighteen-roller single-stand is 2.0%-3.0%, and the temperature of the emulsion is 45℃-55℃. The emulsion is used for lubrication and cooling of the strip steel, and the emulsion temperature is too high, which will cause the emulsion additive to precipitate, and the stability of the emulsion will be poor, and the lubrication performance will not be effectively exerted if the temperature is too low.

[0057] Embodiment 1-Embodiment 2:

[0058] The method for producing general oriented silicon steel by eighteen-roller single stand, the parameters of pickling process are shown in Table 1, the process parameters of primary cold rolling and secondary cold rolling are shown in Table 2.

[0059] Table 1 Process parameters of pickling of Example 1 and Example 2

[0060]

[0061]

[0062] Table 2 Process parameters of primary cold rolling and secondary cold rolling of Example 1 and Example 2

[0063]

[0064]

[0065] Comparative Example 1

[0066] The method for producing general oriented silicon steel by eighteen-roller single stand, the parameters of pickling process are shown in Table 3, the process parameters of primary cold rolling and secondary cold rolling are shown in Table 4.

[0067] Table 3 Process parameters of pickling of Comparative Example 1

[0068]

[0069]

[0070] Table 4 Process parameters of primary cold rolling of Comparative Example 1

[0071]

[0072] Example 1-2 is pickled by the pickling process provided in the application, the surface oxide is less, the pickling effect is good, the method for producing general oriented silicon steel by eighteen-roller single stand is used for production, the reduction of each pass, the tension of each pass, the string roller value of each pass, the intermediate roller taper value are reasonably set, the eighteen-roller single stand can stably produce qualified cold rolled silicon steel products by secondary cold rolling, wherein the longitudinal thickness deviation of the cold rolled silicon steel product is controlled within +0.002mm, the transverse same plate difference is controlled within ≤0.008mm, the shape is good. According to the conventional process, the performance of finished product meets the standard. When the hot rolled steel plate of Comparative Example 1 is pickled, the pickling speed is higher than the upper limit of the application, the acid concentration in the second pickling tank, the third pickling tank and the fourth pickling tank is lower than the lower limit of the application, which finally leads to more surface oxide residues of the steel plate, which needs to be pickled twice. When rolling, the first pass tension is too small, which leads to abnormal rolling force, the rolling current reaches 110%, which exceeds the load of rolling mill, the rolling is unstable, which causes the steel strip to break.

[0073] The above merely describes a specific implementation of the present application. Those skilled in the art can clearly understand the specific working processes of the system, modules and units described above for the convenience and brevity of description, and can refer to the corresponding processes in the foregoing method embodiments, which will not be described herein again. It should be understood that the protection scope of the present application is not limited to this, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application.

Claims

1. A method of producing a general oriented silicon steel by an eighteen-roller single stand, characterized in that, The application relates to a method for preparing a cold-rolled plate, comprising the following steps: obtaining a hot-rolled pickling plate, including: obtaining a hot-rolled steel plate, controlling the hot-rolled steel plate to be subjected to pickling treatment through five pickling tanks, wherein the pickling speed satisfies v <= 60 m / min, the acid liquid temperature T satisfies 75 DEG C-90 DEG C, the acid liquid solubility of the first pickling tank satisfies 100 g / L-160 g / L, the acid liquid solubility of the second pickling tank, the third pickling tank and the fourth pickling tank is independently 170 g / L-230 g / L, and the acid liquid solubility of the fifth pickling tank satisfies 260 g / L-330 g / L; carrying out one-time cold rolling on the hot-rolled pickling plate to obtain a one-time cold-rolled plate, wherein the one-time cold rolling comprises four passes, and the four passes comprise: the first pass has a reduction of 27%-33%, an inlet tension of 100-140 KN, an outlet tension of 210-270 KN, a rolling force of 7000-10000 KN and a string roller of 40-100 mm; the second pass has a reduction of 24%-29%, an inlet tension of 150-190 KN, an outlet tension of 180-230 KN, a rolling force of 6500-1000 KN and a string roller of 40-100 mm; the third pass has a reduction of 23%-28%, an inlet tension of 110-150 KN, an outlet tension of 130-180 KN, a rolling force of 6500-1000 KN and a string roller of 40-100 mm; and the fourth pass has a reduction of 23%-28%, an inlet tension of 70-110 KN, an outlet tension of 110-160 KN, a rolling force of 6000-9000 KN and a string roller of 40-100 mm; carrying out decarburization annealing on the one-time cold-rolled plate and then carrying out secondary cold rolling to obtain a secondary cold-rolled plate, wherein the secondary cold rolling comprises two passes, and the two passes comprise: the first pass has a reduction of 35%-42%, an inlet tension of 50-80 KN, an outlet tension of 60-100 KN, a rolling force of 5000-8000 KN and a string roller of 40-100 mm; and the second pass has a reduction of 30%-36%, an inlet tension of 40-70 KN, an outlet tension of 50-90 KN, a rolling force of 5000-8000 KN and a string roller of 40-100 mm; wherein the hot-rolled pickling plate has a thickness of 2.0-3.0 mm and a width of 1000-1300 mm, the one-time cold-rolled plate has a thickness of 0.6-0.64 mm, and the secondary cold-rolled plate has a thickness of 0.24-0.27 mm. The primary cold rolling and the secondary cold rolling adopt an eighteen-roller single-stand unit, the eighteen-roller single-stand unit comprises an intermediate roller with conical rollers with a first taper and a second taper, and a working roller arranged at a first side of the intermediate roller and in contact with the intermediate roller, the working roller is used for rolling the steel material to be rolled, the intermediate roller shifts along its own axial direction during the rolling process; the taper length L1 of a I area corresponding to the first taper of the intermediate roller is 300mm-450mm, the taper length L2 of a II area corresponding to the second taper of the intermediate roller is 50mm-100mm; the taper height H1 of the I area corresponding to the first taper of the intermediate roller is 1mm-3mm, the taper height H2 of the II area corresponding to the second taper of the intermediate roller is 0.02mm-0.09mm, in the steps of the primary rolling and the secondary rolling, the solubility of the emulsion of the eighteen-roller single-stand unit is 2.0%-3.0%, and the temperature of the emulsion is 45℃-55℃; The secondary cold-rolled plate is subjected to magnesium oxide coating, high-temperature annealing-coating insulation layer and tensile flat annealing, laser marking treatment to obtain a general oriented silicon steel.

2. The method of claim 1, wherein, The total reduction rate of the primary cold rolling is 70%-80%.

3. The method of claim 1, wherein, The total reduction rate of the secondary cold rolling is 55%-65%.

4. The method of claim 1, wherein, At least one of the working roller and the intermediate roller satisfies that the roughness is greater than or equal to 1.0um.

Images