A production method for full-process collaborative control of edge rib defect of non-oriented silicon steel

Abstract

The application discloses a production method for full-process collaborative control of edge rib defect of non-oriented silicon steel, and the method is characterized in that the production process of the non-oriented silicon steel is collaboratively controlled in the whole process, and each process link is optimized and controlled, and specific process parameter control of each process link is disclosed, so that the edge rib defect of the strip steel is avoided, and the surface quality of the product is ensured.

Description

Technical Field

[0001] This invention belongs to the field of metal material preparation technology, and in particular relates to a production method for controlling edge rib defects of non-oriented silicon steel through a whole-process collaborative control. Background Technology

[0002] Non-oriented silicon steel, as an important steel product, is widely used in the home appliance industry and related fields such as motors, electrical appliances, transformers, and electrical instruments due to its characteristics of low iron loss, low coercivity, high magnetic permeability, and magnetic induction intensity. However, during the production process, various defects often appear on the edges of non-oriented silicon steel sheets. These defects not only affect the appearance quality of the product but may also seriously affect its performance.

[0003] During the rolling process of non-oriented silicon steel, uneven temperature and stress can lead to uneven strip deformation, resulting in edge rib defects. Macroscopically, these defects manifest as transverse, intersecting strip-like bulges along the strip edge. These defects cause surface quality issues, leading to product downgrading or even scrapping. This method, through comprehensive process control of the non-oriented silicon steel production process, avoids these surface rib defects, ensuring product surface quality and improving economic efficiency. Summary of the Invention

[0004] To address the issue of edge rib defects in the production of non-oriented silicon steel, the present invention aims to provide a production method for the coordinated control of edge rib defects throughout the entire process. This method optimizes control at each stage of the process to avoid the occurrence of edge rib defects in the strip steel, thereby ensuring product surface quality and improving economic efficiency.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This invention discloses a production method for fully collaboratively controlling defects in the edge ribs of non-oriented silicon steel throughout the entire process, comprising:

[0007] The thin slab continuous casting and rolling technology is adopted. The continuously cast slab is heated to the furnace exit temperature in a tunnel furnace step by step. After hot continuous rolling and coiling, non-oriented silicon steel hot-rolled coils are obtained. The thickness of the continuously cast slab is 45-65mm, the furnace exit temperature is 1040-1080℃, the hot rolling start temperature is 1020-1050℃, the hot rolling finish temperature is 850-920℃, and the coiling temperature is 700-760℃.

[0008] The hot rolling mill used in the continuous hot rolling process includes seven stands, F1-F7, with a target wedge shape of -10 to 10 μm for the work rolls and a target crown of ≤40 μm for hot rolling.

[0009] During hot continuous rolling, the roll shifting settings for stands F1-F7 are: F1: -60--90mm; F2: -60--90mm; F3: -30--50mm; F4: 0--30mm; F5: -30--50mm; F6: -30--50mm; F7: -20--40mm;

[0010] During hot continuous rolling, the reduction rates of stands F1-F7 are 40-60%, 30-50%, 30-50%, 20-40%, 20-50%, 20-40%, and 10-30%, respectively.

[0011] During hot continuous rolling, the threading speeds of stands F1-F7 are 0.55-1.25 m / s, 0.85-1.75 m / s, 1.25-2.35 m / s, 2.15-3.25 m / s, 3.95-5.15 m / s, 5.25-7.50 m / s, and 8.15-9.30 m / s, respectively.

[0012] The thickness of the hot-rolled coil obtained by the hot continuous rolling process is 2.5-3.2 mm, and the width is 1250-1290 mm;

[0013] Cold rolling adopts warm rolling at 150-350℃. The cold rolling process consists of five consecutive passes with a total reduction of ≥80% per pass. At the same time, roll shifting and bending rolls are used to control and improve the sheet shape. The cold rolling thickness is 0.50mm.

[0014] During the continuous warm rolling process, the F1-F5 stands are rolled with flat rolls, and the working roll diameters are 451-470mm, 400-430mm, 440-460mm, 430-460mm and 430-450mm respectively.

[0015] Recrystallization annealing is performed in a continuous annealing furnace. The cold-rolled sheet is recrystallized and annealed at a temperature of 600–900℃ for 0.6–1 h to obtain the finished non-oriented silicon steel.

[0016] Furthermore, this method can avoid the occurrence of defects in the ribs at the edge of the strip, thus ensuring the surface quality of the product.

[0017] Furthermore, including:

[0018] The thin slab continuous casting and rolling technology is adopted. The continuous casting slab is heated to the furnace exit temperature in a tunnel furnace step by step. After hot continuous rolling and coiling, non-oriented silicon steel hot-rolled coils are obtained. The thickness of the continuous casting slab is 62mm, the furnace exit temperature is 1055℃, the hot rolling start temperature is 1036℃, the hot rolling finish temperature is 863℃, and the coiling temperature is 732℃.

[0019] The hot rolling mill used in the continuous hot rolling process includes seven stands, F1-F7, with a target wedge shape of -7μm for the work rolls and a target crown of 37μm for hot rolling.

[0020] During hot continuous rolling, the roll shifting settings for stands F1-F7 are: F1: -65mm; F2: -72mm; F3: -45mm; F4: -20mm; F5: -43mm; F6: -36mm; F7: -27mm.

[0021] During the hot continuous rolling process, the reduction rates of stands F1-F7 ranged from 48%, 42%, 36%, 34%, 35%, 31%, and 20%, respectively.

[0022] During the hot continuous rolling process, the threading speeds of stands F1-F7 are 1.05 m / s, 1.56 m / s, 2.13 m / s, 3.14 m / s, 4.96 m / s, 7.25 m / s and 9.13 m / s respectively;

[0023] The hot-rolled coil obtained by the hot continuous rolling process has a thickness of 2.83 mm and a width of 1276 mm;

[0024] Cold rolling adopts warm rolling at 296℃. The cold rolling process consists of five consecutive passes with a total reduction of 82%. At the same time, roll shifting and bending roll control are used to improve the sheet shape. The cold rolling thickness is 0.50mm.

[0025] During the continuous warm rolling process, stands F1-F5 are rolled with flat rolls, and the working roll diameters are 463mm, 426mm, 458mm, 451mm and 443mm respectively.

[0026] The recrystallization annealing was carried out in a continuous annealing furnace. The cold-rolled sheet was recrystallized and annealed at a temperature of 796℃ for 0.85 hours to obtain the finished non-oriented silicon steel.

[0027] Furthermore, including:

[0028] The thin slab continuous casting and rolling technology is adopted. The continuous casting slab is heated to the furnace exit temperature in a tunnel furnace step by step. After hot continuous rolling and coiling, non-oriented silicon steel hot-rolled coil is obtained. The thickness of the continuous casting slab is 52mm, the furnace exit temperature is 1050℃, the hot rolling start temperature is 1030℃, the hot rolling finish temperature is 870℃, and the coiling temperature is 730℃.

[0029] The hot rolling mill used in the continuous hot rolling process includes seven stands, F1-F7, with a target wedge shape of 6μm for the work rolls and a target crown of 35μm for hot rolling.

[0030] During hot continuous rolling, the roll shifting settings for stands F1-F7 are: F1: -78mm; F2: -73mm; F3: -44mm; F4: -11mm; F5: -44mm; F6: -40mm; F7: -34mm.

[0031] During hot continuous rolling, the reduction rates of stands F1-F7 ranged from 42%, 36%, 34%, 33%, 35%, 30%, and 24%, respectively.

[0032] During the hot continuous rolling process, the threading speeds of stands F1-F7 are 0.79 m / s, 1.28 m / s, 1.97 m / s, 2.94 m / s, 4.55 m / s, 6.52 m / s and 8.75 m / s respectively;

[0033] The hot-rolled coil obtained by the hot continuous rolling process has a thickness of 2.95 mm and a width of 1260 mm;

[0034] Cold rolling adopts warm rolling at 200℃. The cold rolling process consists of five consecutive passes with a total reduction of 83% per pass. At the same time, the shape is improved by using shifting rolls and bending rolls. The cold rolling thickness is 0.50mm.

[0035] During the continuous warm rolling process, stands F1-F5 are rolled with flat rolls, and the working roll diameters are 461mm, 425mm, 455mm, 449mm and 440mm respectively.

[0036] The recrystallization annealing was carried out in a continuous annealing furnace. The cold-rolled sheet was recrystallized and annealed at a temperature of 800℃ for 0.75 hours to obtain the finished non-oriented silicon steel.

[0037] Furthermore, including:

[0038] The thin slab continuous casting and rolling technology is adopted. The continuous casting slab is heated to the furnace exit temperature in a tunnel furnace step by step. After hot continuous rolling and coiling, non-oriented silicon steel hot-rolled coil is obtained. The thickness of the continuous casting slab is 58mm, the furnace exit temperature is 1060℃, the hot rolling start temperature is 1040℃, the hot rolling finish temperature is 880℃, and the coiling temperature is 740℃.

[0039] The hot rolling mill used in the continuous hot rolling process includes seven stands, F1-F7, with a target wedge shape of 8μm for the work rolls and a target crown of 38μm for hot rolling.

[0040] During hot continuous rolling, the roll shifting settings for stands F1-F7 are: F1: -70mm; F2: -76mm; F3: -43mm; F4: -26mm; F5: -42mm; F6: -46mm; F7: -35mm.

[0041] During hot continuous rolling, the reduction rates of stands F1-F7 ranged from 50%, 43%, 35%, 36%, 32%, 28%, and 21%, respectively.

[0042] During the hot continuous rolling process, the threading speeds of stands F1-F7 are 0.82 m / s, 1.36 m / s, 1.86 m / s, 2.65 m / s, 4.23 m / s, 6.43 m / s and 8.96 m / s respectively;

[0043] The hot-rolled coil obtained by the hot continuous rolling process has a thickness of 2.65 mm and a width of 1243 mm;

[0044] Cold rolling adopts warm rolling at 213℃. The cold rolling process consists of five consecutive passes with a total reduction of 81% per pass. At the same time, roll shifting and bending roll control are used to improve the sheet shape. The cold rolling thickness is 0.50mm.

[0045] During the continuous warm rolling process, stands F1-F5 are rolled with flat rolls, and the working roll diameters are 461mm, 423mm, 446mm, 450mm and 443mm respectively.

[0046] The recrystallization annealing was carried out in a continuous annealing furnace. The cold-rolled sheet was recrystallized and annealed at a temperature of 810℃ for 0.7h to obtain the finished non-oriented silicon steel.

[0047] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0048] This invention utilizes a method for coordinated control of the entire process of non-oriented silicon steel production, optimizing and controlling each process step to avoid defects in the edge ribs of the strip steel, thereby ensuring product surface quality and improving economic efficiency. Attached Figure Description

[0049] The present invention will be further described below with reference to the accompanying drawings.

[0050] Figure 1 Photograph of surface rib defects in non-oriented silicon steel;

[0051] Figure 2 This is a photograph of the surface of the finished non-oriented silicon steel without rib defects, as shown in Example 1.

[0052] Figure 3 This is a photograph of the surface of the finished non-oriented silicon steel without rib defects, as shown in Example 2.

[0053] Figure 4 This is a photograph of the surface of the non-oriented silicon steel product without rib defects, as shown in Example 3. Detailed Implementation

[0054] Example 1

[0055] The thin slab continuous casting and rolling technology is adopted. The continuous casting slab is heated to the furnace exit temperature in a tunnel furnace step by step. After hot continuous rolling and coiling, non-oriented silicon steel hot-rolled coils are obtained. The thickness of the continuous casting slab is 62mm, the furnace exit temperature is 1055℃, the hot rolling start temperature is 1036℃, the hot rolling finish temperature is 863℃, and the coiling temperature is 732℃.

[0056] The hot rolling mill used in the continuous rolling process includes seven stands, F1-F7, with a target wedge shape of -7μm for the work rolls and a target crown of 37μm for hot rolling.

[0057] During hot continuous rolling, the roll shifting settings for stands F1-F7 are: F1: -65mm; F2: -72mm; F3: -45mm; F4: -20mm; F5: -43mm; F6: -36mm; F7: -27mm.

[0058] During the hot continuous rolling process, the reduction rates of stands F1-F7 ranged from 48%, 42%, 36%, 34%, 35%, 31%, and 20%, respectively.

[0059] During the hot continuous rolling process, the threading speeds of stands F1-F7 are 1.05m / s, 1.56m / s, 2.13m / s, 3.14m / s, 4.96m / s, 7.25m / s and 9.13m / s respectively.

[0060] The hot-rolled coil obtained by the hot continuous rolling process has a thickness of 2.83 mm and a width of 1276 mm.

[0061] Cold rolling adopts warm rolling at 296℃. The cold rolling process consists of five consecutive passes with a total reduction of 82%. At the same time, the shape is improved by using shifting rolls and bending rolls. The cold rolling thickness is 0.50mm.

[0062] During the continuous warm rolling process, stands F1-F5 are rolled with flat rolls, and the working roll diameters are 463mm, 426mm, 458mm, 451mm and 443mm respectively.

[0063] The recrystallization annealing was carried out in a continuous annealing furnace. The cold-rolled sheet was recrystallized and annealed at a temperature of 796℃ for 0.85 hours to obtain the finished non-oriented silicon steel.

[0064] Example 2

[0065] The thin slab continuous casting and rolling technology is adopted. The continuous casting slab is heated to the furnace exit temperature in a tunnel furnace step by step. After hot continuous rolling and coiling, non-oriented silicon steel hot-rolled coil is obtained. The thickness of the continuous casting slab is 52mm, the furnace exit temperature is 1050℃, the hot rolling start temperature is 1030℃, the hot rolling finish temperature is 870℃, and the coiling temperature is 730℃.

[0066] The hot rolling mill used in the continuous rolling process includes seven stands, F1-F7, with a target wedge shape of 6μm for the work rolls and a target crown of 35μm for hot rolling.

[0067] During hot continuous rolling, the roll shifting settings for stands F1-F7 are: F1: -78mm; F2: -73mm; F3: -44mm; F4: -11mm; F5: -44mm; F6: -40mm; F7: -34mm.

[0068] During the hot continuous rolling process, the reduction rates of stands F1-F7 ranged from 42%, 36%, 34%, 33%, 35%, 30%, and 24%, respectively.

[0069] During the hot continuous rolling process, the threading speeds of stands F1-F7 are 0.79 m / s, 1.28 m / s, 1.97 m / s, 2.94 m / s, 4.55 m / s, 6.52 m / s and 8.75 m / s respectively.

[0070] The hot-rolled coil obtained by the hot rolling process has a thickness of 2.95 mm and a width of 1260 mm.

[0071] Cold rolling adopts warm rolling at 200℃. The cold rolling process consists of five consecutive passes with a total reduction of 83% per pass. At the same time, roll shifting and bending roll control are used to improve the sheet shape. The cold rolling thickness is 0.50mm.

[0072] During the continuous warm rolling process, stands F1-F5 are rolled with flat rolls, and the working roll diameters are 461mm, 425mm, 455mm, 449mm and 440mm respectively.

[0073] The recrystallization annealing was carried out in a continuous annealing furnace. The cold-rolled sheet was recrystallized and annealed at a temperature of 800℃ for 0.75 hours to obtain the finished non-oriented silicon steel.

[0074] Example 3

[0075] The thin slab continuous casting and rolling technology is adopted. The continuous casting slab is heated to the furnace exit temperature in a tunnel furnace step by step. After hot continuous rolling and coiling, non-oriented silicon steel hot-rolled coil is obtained. The thickness of the continuous casting slab is 58mm, the furnace exit temperature is 1060℃, the hot rolling start temperature is 1040℃, the hot rolling finish temperature is 880℃, and the coiling temperature is 740℃.

[0076] The hot rolling mill used in the continuous rolling process includes seven stands, F1-F7, with a target wedge shape of 8μm for the work rolls and a target crown of 38μm for hot rolling.

[0077] During hot continuous rolling, the roll shifting settings for stands F1-F7 are: F1: -70mm; F2: -76mm; F3: -43mm; F4: -26mm; F5: -42mm; F6: -46mm; F7: -35mm.

[0078] During the hot continuous rolling process, the reduction rates of stands F1-F7 ranged from 50%, 43%, 35%, 36%, 32%, 28%, and 21%, respectively.

[0079] During the hot continuous rolling process, the threading speeds of stands F1-F7 are 0.82m / s, 1.36m / s, 1.86m / s, 2.65m / s, 4.23m / s, 6.43m / s and 8.96m / s respectively.

[0080] The hot-rolled coil obtained by the hot continuous rolling process has a thickness of 2.65 mm and a width of 1243 mm.

[0081] Cold rolling adopts warm rolling at 213℃. The cold rolling process consists of five consecutive passes with a total reduction of 81% per pass. At the same time, roll shifting and bending roll control are used to improve the sheet shape. The cold rolling thickness is 0.50mm.

[0082] During the continuous warm rolling process, stands F1-F5 are rolled with flat rolls, and the working roll diameters are 461mm, 423mm, 446mm, 450mm and 443mm respectively.

[0083] The recrystallization annealing was carried out in a continuous annealing furnace. The cold-rolled sheet was recrystallized and annealed at a temperature of 810℃ for 0.7h to obtain the finished non-oriented silicon steel.

[0084] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A production method for full-process collaborative control of defects in the edge ribs of non-oriented silicon steel, characterized in that: include: The thin slab continuous casting and rolling technology is adopted. The continuously cast slab is heated to the furnace exit temperature in a tunnel furnace step by step. After hot continuous rolling and coiling, non-oriented silicon steel hot-rolled coils are obtained. The thickness of the continuously cast slab is 45-65mm, the furnace exit temperature is 1040-1080℃, the hot rolling start temperature is 1020-1050℃, the hot rolling finish temperature is 850-920℃, and the coiling temperature is 700-760℃. The hot rolling mill used in the continuous hot rolling process includes seven stands, F1-F7, with a target wedge shape of -10 to 10 μm for the work rolls and a target crown of ≤40 μm for hot rolling. During hot continuous rolling, the roll shifting settings for stands F1-F7 are: F1: -60--90mm; F2: -60--90mm; F3: -30--50mm; F4: 0--30mm; F5: -30--50mm; F6: -30--50mm; F7: -20--40mm; During hot continuous rolling, the reduction rates of stands F1-F7 are 40-60%, 30-50%, 30-50%, 20-40%, 20-50%, 20-40%, and 10-30%, respectively. During hot continuous rolling, the threading speeds of stands F1-F7 are 0.55-1.25 m / s, 0.85-1.75 m / s, 1.25-2.35 m / s, 2.15-3.25 m / s, 3.95-5.15 m / s, 5.25-7.50 m / s, and 8.15-9.30 m / s, respectively. The thickness of the hot-rolled coil obtained by the hot continuous rolling process is 2.5-3.2 mm, and the width is 1250-1290 mm; Cold rolling adopts warm rolling at 150-350℃. The cold rolling process consists of five consecutive passes with a total reduction of ≥80% per pass. Simultaneously, roll shifting and bending are used to control and improve the sheet shape. The cold rolling thickness is 0.50mm. During the continuous warm rolling process, the F1-F5 stands are rolled with flat rolls, and the working roll diameters are 451-470mm, 400-430mm, 440-460mm, 430-460mm and 430-450mm respectively. Recrystallization annealing is performed in a continuous annealing furnace. The cold-rolled sheet is recrystallized and annealed at a temperature of 600–900℃ for 0.6–1 h to obtain the finished non-oriented silicon steel.

2. The production method for full-process collaborative control of edge rib defects in non-oriented silicon steel according to claim 1, characterized in that: include: The thin slab continuous casting and rolling technology is adopted. The continuous casting slab is heated to the furnace exit temperature in a tunnel furnace step by step. After hot continuous rolling and coiling, non-oriented silicon steel hot-rolled coils are obtained. The thickness of the continuous casting slab is 62mm, the furnace exit temperature is 1055℃, the hot rolling start temperature is 1036℃, the hot rolling finish temperature is 863℃, and the coiling temperature is 732℃. The hot rolling mill used in the continuous hot rolling process includes seven stands, F1-F7, with a target wedge shape of -7μm for the work rolls and a target crown of 37μm for hot rolling. During hot continuous rolling, the roll shifting settings for stands F1-F7 are: F1: -65mm; F2: -72mm; F3: -45mm; F4: -20mm; F5: -43mm; F6: -36mm; F7: -27mm. During hot continuous rolling, the reduction rates of stands F1-F7 ranged from 48%, 42%, 36%, 34%, 35%, 31%, and 20%, respectively. During the hot continuous rolling process, the threading speeds of stands F1-F7 are 1.05 m / s, 1.56 m / s, 2.13 m / s, 3.14 m / s, 4.96 m / s, 7.25 m / s and 9.13 m / s respectively; The hot-rolled coil obtained by the hot continuous rolling process has a thickness of 2.83 mm and a width of 1276 mm; Cold rolling adopts warm rolling at 296℃. The cold rolling process consists of five consecutive passes with a total reduction of 82%. At the same time, roll shifting and bending roll control are used to improve the sheet shape. The cold rolling thickness is 0.50mm. During the continuous warm rolling process, stands F1-F5 are rolled with flat rolls, and the working roll diameters are 463mm, 426mm, 458mm, 451mm and 443mm respectively. The recrystallization annealing was carried out in a continuous annealing furnace. The cold-rolled sheet was recrystallized and annealed at a temperature of 796℃ for 0.85 hours to obtain the finished non-oriented silicon steel.

3. The production method for full-process collaborative control of edge rib defects in non-oriented silicon steel according to claim 1, characterized in that: include: The thin slab continuous casting and rolling technology is adopted. The continuous casting slab is heated to the furnace exit temperature in a tunnel furnace step by step. After hot continuous rolling and coiling, non-oriented silicon steel hot-rolled coil is obtained. The thickness of the continuous casting slab is 52mm, the furnace exit temperature is 1050℃, the hot rolling start temperature is 1030℃, the hot rolling finish temperature is 870℃, and the coiling temperature is 730℃. The hot rolling mill used in the continuous hot rolling process includes seven stands, F1-F7, with a target wedge shape of 6μm for the work rolls and a target crown of 35μm for hot rolling. During hot continuous rolling, the roll shifting settings for stands F1-F7 are: F1: -78mm; F2: -73mm; F3: -44mm; F4: -11mm; F5: -44mm; F6: -40mm; F7: -34mm. During hot continuous rolling, the reduction rates of stands F1-F7 ranged from 42%, 36%, 34%, 33%, 35%, 30%, and 24%, respectively. During the hot continuous rolling process, the threading speeds of stands F1-F7 are 0.79 m / s, 1.28 m / s, 1.97 m / s, 2.94 m / s, 4.55 m / s, 6.52 m / s and 8.75 m / s respectively; The hot-rolled coil obtained by the hot continuous rolling process has a thickness of 2.95 mm and a width of 1260 mm; Cold rolling adopts warm rolling at 200℃. The cold rolling process consists of five consecutive passes with a total reduction of 83% per pass. At the same time, roll shifting and bending roll control are used to improve the sheet shape. The cold rolling thickness is 0.50mm. During the continuous warm rolling process, stands F1-F5 are rolled with flat rolls, and the working roll diameters are 461mm, 425mm, 455mm, 449mm and 440mm respectively. The recrystallization annealing was carried out in a continuous annealing furnace. The cold-rolled sheet was recrystallized and annealed at a temperature of 800℃ for 0.75 hours to obtain the finished non-oriented silicon steel.

4. The production method for full-process collaborative control of edge rib defects in non-oriented silicon steel according to claim 1, characterized in that: include: The thin slab continuous casting and rolling technology is adopted. The continuous casting slab is heated to the furnace exit temperature in a tunnel furnace step by step. After hot continuous rolling and coiling, non-oriented silicon steel hot-rolled coil is obtained. The thickness of the continuous casting slab is 58mm, the furnace exit temperature is 1060℃, the hot rolling start temperature is 1040℃, the hot rolling finish temperature is 880℃, and the coiling temperature is 740℃. The hot rolling mill used in the continuous hot rolling process includes seven stands, F1-F7, with a target wedge shape of 8μm for the work rolls and a target crown of 38μm for hot rolling. During hot continuous rolling, the roll shifting settings for stands F1-F7 are: F1: -70mm; F2: -76mm; F3: -43mm; F4: -26mm; F5: -42mm; F6: -46mm; F7: -35mm. During hot continuous rolling, the reduction rates of stands F1-F7 ranged from 50%, 43%, 35%, 36%, 32%, 28%, and 21%, respectively. During the hot continuous rolling process, the threading speeds of stands F1-F7 are 0.82 m / s, 1.36 m / s, 1.86 m / s, 2.65 m / s, 4.23 m / s, 6.43 m / s and 8.96 m / s respectively; The hot-rolled coil obtained by the hot continuous rolling process has a thickness of 2.65 mm and a width of 1243 mm; Cold rolling adopts warm rolling at 213℃. The cold rolling process consists of five consecutive passes with a total reduction of 81% per pass. At the same time, roll shifting and bending roll control are used to improve the sheet shape. The cold rolling thickness is 0.50mm. During the continuous warm rolling process, stands F1-F5 are rolled with flat rolls, and the working roll diameters are 461mm, 423mm, 446mm, 450mm and 443mm respectively. The recrystallization annealing was carried out in a continuous annealing furnace. The cold-rolled sheet was recrystallized and annealed at a temperature of 810℃ for 0.7h to obtain the finished non-oriented silicon steel.

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