Production method for cooperatively controlling edge rib defects of non-oriented silicon steel in whole process

Abstract

The invention discloses a production method for full-process coordinated control of non-oriented silicon steel edge rib defects, which is characterized in that through full-process coordinated control of a non-oriented silicon steel production process method, optimization control is carried out in each process link, and specific process parameter control of each process link is disclosed, so that strip steel edge rib defects are avoided. And the product surface quality is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal material preparation, and in particular relates to a production method for collaboratively controlling edge rib defects of non-oriented silicon steel throughout the entire process. Background Art

[0002] As an important steel product, non-oriented silicon steel has been widely used in the home appliance industry and related fields such as motors, electrical appliances, transformers, and electrical instruments due to its low iron loss, small coercive force, 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, which not only affect the appearance quality of the product, but also may have a serious impact on its performance.

[0003] During the rolling process of non-oriented silicon steel, uneven temperature and uneven force will cause uneven deformation of the strip, resulting in edge rib defects. From a macroscopic perspective, the edge rib defects of the strip are mainly manifested as strip-like ridges that cross the edge of the strip in the transverse direction. The appearance of edge rib defects will lead to product surface quality problems, causing product degradation or even scrapping. This method avoids the appearance of surface rib defects of non-oriented silicon steel by collaboratively controlling the non-oriented silicon steel production process throughout the entire process, ensuring product surface quality and improving economic benefits. Summary of the invention

[0004] In order to solve the problem of edge rib defects in non-oriented silicon steel, the purpose of the present invention is to provide a production method for collaboratively controlling edge rib defects in non-oriented silicon steel throughout the entire process, optimizing control in each process link to avoid the occurrence of edge rib defects in the strip, thereby ensuring product surface quality and improving economic benefits.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a production method for controlling the defects of non-oriented silicon steel edge ribs in a whole process in a coordinated manner, comprising:

[0007] The thin slab continuous casting and rolling technology is adopted to heat the continuous casting slab step by step in the tunnel furnace to the furnace discharge temperature, and then undergo hot continuous rolling and coiling to obtain the non-oriented silicon steel hot rolled coil; the continuous casting slab thickness is 45-65mm, the furnace discharge temperature is 1040-1080℃, the hot rolling start temperature is 1020-1050℃, the hot rolling final rolling temperature is 850-920℃, and the coiling temperature is 700-760℃;

[0008] The rolling mill used in the hot rolling process includes seven stands from F1 to F7, the target wedge of the working roll is -10 to 10 μm, and the target crown of the hot rolling is ≤40 μm;

[0009] During the hot rolling process, the setting values ​​of the F1-F7 stand roll shifting are F1: -60--90mm; F2: -60--90mm; F3: -30--50mm; F4: 0--30mm; F5: -30--50mm; F6: -30--50mm; F7: -20--40mm;

[0010] The reduction ratios of the F1-F7 stands during hot rolling range from 40-60%, 30-50%, 30-50%, 20-40%, 20-50%, 20-40% and 10-30% respectively;

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

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

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

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

[0015] The recrystallization annealing adopts a continuous annealing furnace to perform recrystallization annealing on the cold-rolled sheet. The annealing temperature is 600-900° C. and the annealing time is 0.6-1h to obtain a finished non-oriented silicon steel.

[0016] Furthermore, the method can avoid the occurrence of rib defects on the edge of the strip and ensure the surface quality of the product.

[0017] Further, including:

[0018] The thin slab continuous casting and rolling technology is adopted to heat the continuous casting slab step by step to the furnace discharge temperature in the tunnel furnace, and then obtain the non-oriented silicon steel hot rolled coil after hot continuous rolling and coiling; the continuous casting slab thickness is 62mm, the furnace discharge temperature is 1055℃, the hot rolling start temperature is 1036℃, the hot rolling final rolling temperature is 863℃, and the coiling temperature is 732℃;

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

[0020] During the hot rolling process, the setting values ​​of the F1-F7 stand roll shifting are F1: -65mm; F2: -72mm; F3: -45mm; F4: -20mm; F5: -43mm; F6: -36mm; F7: -27mm;

[0021] The reduction ratios of the F1-F7 stands during hot rolling ranged from 48%, 42%, 36%, 34%, 35%, 31% and 20% respectively;

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

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

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

[0025] During the warm rolling process, the F1-F5 stands adopt flat roll rolling, and the working roll diameters are 463mm, 426mm, 458mm, 451mm and 443mm respectively;

[0026] The recrystallization annealing adopts a continuous annealing furnace to perform recrystallization annealing on the cold-rolled sheet. The annealing temperature is 796° C. and the annealing time is 0.85 h to obtain a finished non-oriented silicon steel.

[0027] Further, including:

[0028] The thin slab continuous casting and rolling technology is adopted to heat the continuous casting slab step by step to the furnace discharge temperature in the tunnel furnace, and then obtain the non-oriented silicon steel hot rolled coil after hot continuous rolling and coiling; the continuous casting slab thickness is 52mm, the furnace discharge temperature is 1050℃, the hot rolling start temperature is 1030℃, the hot rolling final rolling temperature is 870℃, and the coiling temperature is 730℃;

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

[0030] During the hot rolling process, the setting values ​​of the F1-F7 stand roll shifting are F1: -78mm; F2: -73mm; F3: -44mm; F4: -11mm; F5: -44mm; F6: -40mm; F7: -34mm;

[0031] The reduction ratios of the F1-F7 stands during hot rolling ranged from 42%, 36%, 34%, 33%, 35%, 30% and 24% respectively;

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

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

[0034] The cold rolling adopts warm rolling at 200℃, and the cold rolling passes are five continuous rolling passes with a total reduction of 83%. At the same time, the shifting roll and bending roll control are used to improve the plate shape. The cold rolling thickness is 0.50mm.

[0035] During the warm rolling process, the F1-F5 stands adopt flat roll rolling, and the working roll diameters are 461mm, 425mm, 455mm, 449mm and 440mm respectively;

[0036] The recrystallization annealing adopts a continuous annealing furnace to perform recrystallization annealing on the cold-rolled sheet. The annealing temperature is 800° C. and the annealing time is 0.75 h to obtain a finished non-oriented silicon steel.

[0037] Further, including:

[0038] The thin slab continuous casting and rolling technology is adopted to heat the continuous casting slab step by step to the furnace discharge temperature in the tunnel furnace, and then obtain the non-oriented silicon steel hot rolled coil after hot continuous rolling and coiling; the continuous casting slab thickness is 58mm, the furnace discharge temperature is 1060℃, the hot rolling start temperature is 1040℃, the hot rolling final rolling temperature is 880℃, and the coiling temperature is 740℃;

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

[0040] During the hot rolling process, the setting values ​​of the F1-F7 stand roll shifting are F1: -70mm; F2: -76mm; F3: -43mm; F4: -26mm; F5: -42mm; F6: -46mm; F7: -35mm;

[0041] The reduction ratios of the F1-F7 stands during hot rolling ranged from 50%, 43%, 35%, 36%, 32%, 28% and 21% respectively;

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

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

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

[0045] During the warm rolling process, the F1-F5 stands adopt flat roll rolling, and the working roll diameters are 461mm, 423mm, 446mm, 450mm and 443mm respectively;

[0046] The recrystallization annealing adopts a continuous annealing furnace to perform recrystallization annealing on the cold-rolled sheet. The annealing temperature is 810° C. and the annealing time is 0.7 h to obtain a finished non-oriented silicon steel.

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

[0048] The present invention coordinates and controls the production process of non-oriented silicon steel throughout the entire process, optimizes and controls each process link, and avoids the occurrence of rib defects at the edge of the strip, thereby ensuring the surface quality of the product and improving the economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0050] Figure 1 This is a photo of the rib defect on the surface of non-oriented silicon steel;

[0051] Figure 2 This is a photo of the surface of the finished non-oriented silicon steel without rib defects in Example 1;

[0052] Figure 3 This is a photo of the finished product of Example 2, non-oriented silicon steel, with no rib defects on the surface;

[0053] Figure 4 This is a photo of the finished non-oriented silicon steel in Example 3 with no rib defects on the surface. DETAILED DESCRIPTION

[0054] Example 1

[0055] The thin slab continuous casting and rolling technology is adopted to heat the continuous casting slab step by step to the furnace discharge temperature in the tunnel furnace, and then obtain the non-oriented silicon steel hot rolled coil after hot continuous rolling and coiling; the continuous casting slab thickness is 62mm, the furnace discharge temperature is 1055℃, the hot rolling start temperature is 1036℃, the hot rolling final rolling temperature is 863℃, and the coiling temperature is 732℃;

[0056] The rolling mill used in the hot rolling process includes seven stands, F1-F7, with a target wedge shape of the working rolls of -7μm; the target convexity of hot rolling is 37μm.

[0057] During the hot rolling process, the setting values ​​of the F1-F7 frame roll shifting are F1: -65mm; F2: -72mm; F3: -45mm; F4: -20mm; F5: -43mm; F6: -36mm; F7: -27mm.

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

[0059] During the hot rolling process, the strip threading speeds of the F1-F7 frames 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 rolling process has a thickness of 2.83 mm and a width of 1276 mm.

[0061] The cold rolling adopts warm rolling at 296℃. The cold rolling passes are five consecutive passes with a total reduction of 82%. At the same time, shifting roll and bending roll control are used to improve the plate shape. The cold rolling thickness is 0.50mm.

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

[0063] The recrystallization annealing adopts a continuous annealing furnace to perform recrystallization annealing on the cold-rolled sheet. The annealing temperature is 796° C. and the annealing time is 0.85 h to obtain a finished non-oriented silicon steel.

[0064] Example 2

[0065] The thin slab continuous casting and rolling technology is adopted to heat the continuous casting slab step by step to the furnace discharge temperature in the tunnel furnace, and then obtain the non-oriented silicon steel hot rolled coil after hot continuous rolling and coiling; the continuous casting slab thickness is 52mm, the furnace discharge temperature is 1050℃, the hot rolling start temperature is 1030℃, the hot rolling final rolling temperature is 870℃, and the coiling temperature is 730℃;

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

[0067] During the hot rolling process, the setting values ​​of the F1-F7 stand roll shifting are F1: -78mm; F2: -73mm; F3: -44mm; F4: -11mm; F5: -44mm; F6: -40mm; F7: -34mm.

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

[0069] During the hot rolling process, the strip threading speeds of the F1-F7 frames are 0.79m / s, 1.28m / s, 1.97m / s, 2.94m / s, 4.55m / s, 6.52m / s and 8.75m / 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] The cold rolling adopts warm rolling at 200℃. The cold rolling passes are five consecutive passes with a total reduction of 83%. At the same time, shifting roll and bending roll control are used to improve the plate shape. The cold rolling thickness is 0.50mm.

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

[0073] The recrystallization annealing adopts a continuous annealing furnace to perform recrystallization annealing on the cold-rolled sheet. The annealing temperature is 800° C. and the annealing time is 0.75 h to obtain a finished non-oriented silicon steel.

[0074] Example 3

[0075] The thin slab continuous casting and rolling technology is adopted to heat the continuous casting slab step by step to the furnace discharge temperature in the tunnel furnace, and then obtain the non-oriented silicon steel hot rolled coil after hot continuous rolling and coiling; the continuous casting slab thickness is 58mm, the furnace discharge temperature is 1060℃, the hot rolling start temperature is 1040℃, the hot rolling final rolling temperature is 880℃, and the coiling temperature is 740℃;

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

[0077] During the hot rolling process, the setting values ​​of the F1-F7 stand roll shifting are F1: -70mm; F2: -76mm; F3: -43mm; F4: -26mm; F5: -42mm; F6: -46mm; F7: -35mm.

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

[0079] During the hot rolling process, the strip threading speeds of the F1-F7 frames 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 rolling process has a thickness of 2.65 mm and a width of 1243 mm.

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

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

[0083] The recrystallization annealing adopts a continuous annealing furnace to perform recrystallization annealing on the cold-rolled sheet. The annealing temperature is 810° C. and the annealing time is 0.7 h to obtain a finished non-oriented silicon steel.

[0084] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A production method for controlling the defects of edge ribs of non-oriented silicon steel in a coordinated manner throughout the entire process, characterized in that: include: The thin slab continuous casting and rolling technology is adopted to heat the continuous casting slab step by step in the tunnel furnace to the furnace discharge temperature, and then undergo hot continuous rolling and coiling to obtain the non-oriented silicon steel hot rolled coil; the continuous casting slab thickness is 45-65mm, the furnace discharge temperature is 1040-1080℃, the hot rolling start temperature is 1020-1050℃, the hot rolling final rolling temperature is 850-920℃, and the coiling temperature is 700-760℃; The rolling mill used in the hot rolling process includes seven stands from F1 to F7, the target wedge of the working roll is -10 to 10 μm, and the target crown of the hot rolling is ≤40 μm; During the hot rolling process, the setting values ​​of the F1-F7 stand roll shifting are F1: -60--90mm; F2: -60--90mm; F3: -30--50mm; F4: 0--30mm; F5: -30--50mm; F6: -30--50mm; F7: -20--40mm; The reduction ratios of the F1-F7 stands during hot rolling range from 40-60%, 30-50%, 30-50%, 20-40%, 20-50%, 20-40% and 10-30% respectively; During the hot rolling process, the strip threading speeds of the F1-F7 stands are 0.55-1.25m / s, 0.85-1.75m / s, 1.25-2.35m / s, 2.15-3.25m / s, 3.95-5.15m / s, 5.25-7.50m / s and 8.15-9.30m / s respectively; The hot rolled coil obtained by the hot rolling process has a thickness of 2.5-3.2 mm and a width of 1250-1290 mm; The cold rolling adopts warm rolling at 150-350℃. The cold rolling passes are five consecutive passes with a total reduction of ≥80%. At the same time, the shifting and bending rolls are used to control the plate shape. The cold rolling thickness is 0.50mm. During the warm rolling process, the F1-F5 stands adopt flat roll rolling, and the working roll diameters are 451-470mm, 400-430mm, 440-460mm, 430-460mm and 430-450mm respectively; The recrystallization annealing adopts a continuous annealing furnace to perform recrystallization annealing on the cold-rolled sheet. The annealing temperature is 600-900° C. and the annealing time is 0.6-1h to obtain a finished non-oriented silicon steel.

2. The production method for full-process coordinated control of non-oriented silicon steel edge rib defects according to claim 1, characterized in that: This method can avoid the occurrence of rib defects on the edge of the strip and ensure the surface quality of the product.

3. The production method for full-process coordinated control of non-oriented silicon steel edge rib defects according to claim 1, characterized in that: include: The thin slab continuous casting and rolling technology is adopted to heat the continuous casting slab step by step to the furnace discharge temperature in the tunnel furnace, and then obtain the non-oriented silicon steel hot rolled coil after hot continuous rolling and coiling; the continuous casting slab thickness is 62mm, the furnace discharge temperature is 1055℃, the hot rolling start temperature is 1036℃, the hot rolling final rolling temperature is 863℃, and the coiling temperature is 732℃; The rolling mill used in the hot rolling process includes seven stands, F1-F7, with a target wedge shape of the working rolls of -7μm and a target crown of 37μm. During the hot rolling process, the setting values ​​of the F1-F7 stand roll shifting are F1: -65mm; F2: -72mm; F3: -45mm; F4: -20mm; F5: -43mm; F6: -36mm; F7: -27mm; The reduction ratios of the F1-F7 stands during hot rolling ranged from 48%, 42%, 36%, 34%, 35%, 31% and 20% respectively; During the hot rolling process, the strip threading speeds of the F1-F7 stands are 1.05m / s, 1.56m / s, 2.13m / s, 3.14m / s, 4.96m / s, 7.25m / s and 9.13m / s respectively; The hot rolled coil obtained by the hot rolling process has a thickness of 2.83 mm and a width of 1276 mm; The cold rolling adopts warm rolling at 296℃, and the cold rolling passes are five continuous rolling passes with a total reduction of 82%. At the same time, the shifting roll and bending roll control are used to improve the plate shape. The cold rolling thickness is 0.50mm. During the warm rolling process, the F1-F5 stands adopt flat roll rolling, and the working roll diameters are 463mm, 426mm, 458mm, 451mm and 443mm respectively; The recrystallization annealing adopts a continuous annealing furnace to perform recrystallization annealing on the cold-rolled sheet. The annealing temperature is 796° C. and the annealing time is 0.85 h to obtain a finished non-oriented silicon steel.

4. The production method for full-process coordinated control of non-oriented silicon steel edge rib defects according to claim 1, characterized in that: include: The thin slab continuous casting and rolling technology is adopted to heat the continuous casting slab step by step to the furnace discharge temperature in the tunnel furnace, and then obtain the non-oriented silicon steel hot rolled coil after hot continuous rolling and coiling; the continuous casting slab thickness is 52mm, the furnace discharge temperature is 1050℃, the hot rolling start temperature is 1030℃, the hot rolling final rolling temperature is 870℃, and the coiling temperature is 730℃; The rolling mill used in the hot rolling process includes seven stands, F1-F7, with a target wedge shape of the working rolls of 6μm and a target crown of 35μm. During the hot rolling process, the setting values ​​of the F1-F7 stand roll shifting are F1: -78mm; F2: -73mm; F3: -44mm; F4: -11mm; F5: -44mm; F6: -40mm; F7: -34mm; The reduction ratios of the F1-F7 stands during hot rolling ranged from 42%, 36%, 34%, 33%, 35%, 30% and 24% respectively; During the hot rolling process, the strip threading speeds of the F1-F7 stands are 0.79m / s, 1.28m / s, 1.97m / s, 2.94m / s, 4.55m / s, 6.52m / s and 8.75m / s respectively; The hot rolled coil obtained by the hot rolling process has a thickness of 2.95 mm and a width of 1260 mm; The cold rolling adopts warm rolling at 200℃, and the cold rolling passes are five continuous rolling passes with a total reduction of 83%. At the same time, the shifting roll and bending roll control are used to improve the plate shape. The cold rolling thickness is 0.50mm. During the warm rolling process, the F1-F5 stands adopt flat roll rolling, and the working roll diameters are 461mm, 425mm, 455mm, 449mm and 440mm respectively; The recrystallization annealing adopts a continuous annealing furnace to perform recrystallization annealing on the cold-rolled sheet. The annealing temperature is 800° C. and the annealing time is 0.75 h to obtain a finished non-oriented silicon steel.

5. The production method for full-process coordinated control of non-oriented silicon steel edge rib defects according to claim 1, characterized in that: include: The thin slab continuous casting and rolling technology is adopted to heat the continuous casting slab step by step to the furnace discharge temperature in the tunnel furnace, and then obtain the non-oriented silicon steel hot rolled coil after hot continuous rolling and coiling; the continuous casting slab thickness is 58mm, the furnace discharge temperature is 1060℃, the hot rolling start temperature is 1040℃, the hot rolling final rolling temperature is 880℃, and the coiling temperature is 740℃; The rolling mill used in the hot rolling process includes seven stands, F1-F7, with a target wedge shape of the working rolls of 8μm and a target crown of 38μm. During the hot rolling process, the setting values ​​of the F1-F7 stand roll shifting are F1: -70mm; F2: -76mm; F3: -43mm; F4: -26mm; F5: -42mm; F6: -46mm; F7: -35mm; The reduction ratios of the F1-F7 stands during hot rolling ranged from 50%, 43%, 35%, 36%, 32%, 28% and 21% respectively; During the hot rolling process, the strip threading speeds of the F1-F7 stands are 0.82m / s, 1.36m / s, 1.86m / s, 2.65m / s, 4.23m / s, 6.43m / s and 8.96m / s respectively; The hot rolled coil obtained by the hot rolling process has a thickness of 2.65 mm and a width of 1243 mm; The cold rolling adopts warm rolling at 213℃. The cold rolling passes are five continuous rolling passes with a total reduction of 81%. At the same time, the shifting roll and bending roll control are used to improve the plate shape. The cold rolling thickness is 0.50mm. During the warm rolling process, the F1-F5 stands adopt flat roll rolling, and the working roll diameters are 461mm, 423mm, 446mm, 450mm and 443mm respectively; The recrystallization annealing adopts a continuous annealing furnace to perform recrystallization annealing on the cold-rolled sheet. The annealing temperature is 810° C. and the annealing time is 0.7 h to obtain a finished non-oriented silicon steel.

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