CN113020283A - A kind of shape control method of oriented silicon steel hot-rolled strip - Google Patents
A kind of shape control method of oriented silicon steel hot-rolled strip Download PDFInfo
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- CN113020283A CN113020283A CN202110288598.9A CN202110288598A CN113020283A CN 113020283 A CN113020283 A CN 113020283A CN 202110288598 A CN202110288598 A CN 202110288598A CN 113020283 A CN113020283 A CN 113020283A
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- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005096 rolling process Methods 0.000 claims abstract description 219
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 59
- 239000010959 steel Substances 0.000 claims abstract description 59
- 230000008569 process Effects 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims description 51
- 230000009467 reduction Effects 0.000 claims description 12
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 8
- 230000001133 acceleration Effects 0.000 claims description 8
- 238000013000 roll bending Methods 0.000 claims description 8
- 238000005452 bending Methods 0.000 claims description 6
- 238000010409 ironing Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000005098 hot rolling Methods 0.000 abstract description 8
- 238000005097 cold rolling Methods 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000007668 thin rolling process Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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Abstract
本发明涉及一种取向硅钢热轧钢带的板形控制方法，所述取向硅钢热轧钢带的工艺流程包括铸坯加热过程、轧制过程及层流冷却过程；其中轧制过程中采取取向硅钢与普钢交叉轧制的方式；粗轧过程采取R1轧制1道次、R2轧制5道次的1+5轧制工艺，并控制轧制工艺参数；精轧过程中控制F1～F7轧制工艺参数。本发明通过设定合理的交叉轧制工艺及取向硅钢热轧工艺，使取向硅钢的轧制稳定性大幅提高，取向硅钢带形控制良好，凸度控制在30～50μm之内，楔形控制在30μm之内，板形平坦度控制在25iu之内；从而为冷轧工序提供了优质原料。The invention relates to a shape control method for a hot-rolled steel strip of oriented silicon steel. The method of cross rolling between silicon steel and ordinary steel; the rough rolling process adopts a 1+5 rolling process of 1 pass of R1 rolling and 5 passes of R2 rolling, and the rolling process parameters are controlled; during the finishing rolling process, F1～F7 is controlled Rolling process parameters. By setting a reasonable cross rolling process and oriented silicon steel hot rolling process, the invention greatly improves the rolling stability of the oriented silicon steel, the strip shape of the oriented silicon steel is well controlled, the crown is controlled within 30-50 μm, and the wedge shape is controlled within 30 μm Inside, the flatness of the plate shape is controlled within 25iu; thus providing high-quality raw materials for the cold rolling process.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a method for controlling the shape of an oriented silicon steel hot-rolled steel strip.
Background
The oriented silicon steel is known as a 'handicraft in steel products' due to the characteristics of long process route, high technical content, complex process, narrow process window, strict process control and the like.
The oriented silicon steel has a thin rolling specification (the general thickness is 1.8-2.3 mm), the rolling speed is high, and in order to ensure the maximum production capacity of a rolling line, the oriented silicon steel and the common steel are usually subjected to cross rolling. However, the unreasonable cross rolling process directly influences the rolling stability of the oriented silicon steel, so that the shape of the steel strip is difficult to control, and the steel strip has poor shape and serious convexity and wedge overproof; the unreasonable rolling process can aggravate the difficulty of plate shape control; these factors have a great influence on the plate shape quality of the oriented silicon steel, and seriously affect the subsequent cold rolling processing of the oriented silicon steel.
The patent application with the publication number of CN107488815A discloses a medium-temperature oriented silicon steel hot-rolled steel strip and a preparation method thereof, wherein the thickness of an intermediate billet during hot rolling is 40mm, the first-pass rolling reduction of rough rolling is more than 50mm, the F1 reduction rate is more than or equal to 50%, the outlet temperature of rough rolling R2 is more than or equal to 1110 ℃, the finish rolling temperature is 950 +/-15 ℃, and the coiling temperature is 550 +/-15 ℃. It does not relate to the concrete method of shape control, can't guarantee the shape quality after rolling.
Disclosure of Invention
The invention provides a method for controlling the shape of an oriented silicon steel hot rolled steel strip, which greatly improves the rolling stability of the oriented silicon steel by setting a reasonable cross rolling process and an oriented silicon steel hot rolling process, controls the shape of the oriented silicon steel strip well, controls the convexity within 30-50 mu m, controls the wedge within 30 mu m and controls the shape flatness within 25 iu; thereby providing a high-quality raw material for the cold rolling process.
In order to achieve the purpose, the invention adopts the following technical scheme:
the technological process of the oriented silicon steel hot rolled steel strip comprises a casting blank heating process, a rolling process and a laminar cooling process; wherein in the rolling process:
1) the method adopts a mode of cross rolling of the oriented silicon steel and the ordinary steel, and the ordinary steel transition material which is co-rolled with the oriented silicon steel is made of SPCC ordinary steel in each roll changing period of the working rolls;
2) in each working roll period, the number of the hot roll materials is controlled to be 8-13, the thickness of the hot roll materials is 2.8-4.0 mm, the thickness of the hot roll materials is reduced one by one, and the thickness change of 2 continuous steel strips is less than or equal to 0.5 mm;
3) the width of the plain steel and the width of the oriented silicon steel are less than or equal to 200mm, and the thickness of the plain steel and the thickness of the oriented silicon steel are less than or equal to 1.0 mm; the number of the matched and rolled material blocks with the same width specification is less than or equal to 12, and the matched and rolled material has 2-3 different width specifications in one roll changing period;
4) the general steel and the oriented silicon steel except the ironing roller material adopt a large cross rolling mode, namely 5-10 pieces of oriented silicon steel are rolled firstly, and then 5-10 pieces of matched rolling materials are rolled;
5) in a single working roll period, the number of rolling blocks is controlled to be 60-80.
The rolling comprises a rough rolling process and a finish rolling process, wherein the rough rolling process comprises rough rolling descaling, rough rolling SP width fixing machine rolling, rough rolling E1R1 rolling and rough rolling E2R2 rolling; the finish rolling process comprises finish rolling descaling, finish rolling vertical roller rolling and finish rolling F1-F7 rolling.
In the rough rolling process, the transverse temperature difference of a rough rolling plate blank is controlled within 30 ℃, the rough rolling adopts 1+5 rolling processes of 1 pass of R1 rolling and 5 passes of R2 rolling, and the total side pressure of the plate blank is not more than 45 mm; controlling the wedge shape of the rough rolling intermediate billet to be below 0.2mm, controlling the offset between the center line of the intermediate billet and the rolling center line not to exceed 15mm, and controlling the camber of the head of the intermediate billet, namely controlling the offset between the center line of the head and the rolling center line not to exceed 30 mm.
In the finish rolling process of F1-F7, the threading speed of F1 is controlled to be 0.7-1.2 m/s, and the first acceleration is controlled to be 0.08-0.15 m/s2And the steel throwing speed of F7 is controlled to be 10.5-11.4 m/s.
In the finish rolling process of F1-F7, the reduction rate of each pass is as follows: F1-F3 is more than or equal to 40 percent, F4-F6 are more than or equal to 20 percent and less than 40 percent, and F7 is less than 20 percent.
In the finish rolling process of F1-F7, a bending roll and a PC rolling mill are coordinated, and the outlet thickness of the front 3 rolling mills is gradually reduced within the range of 85-60T one by one; when F2-F4 are rolled, the angle set by the PC rolling mill is 0.6-0.3 degrees, and the angle is gradually decreased from frame to frame; the roll bending force of the rear 4-frame rolling mill is set to be 55-35T and is set from large to small.
And in the finish rolling process of F1-F7, the fluctuation range of the FDT of the outlet side temperature of the rolling mill is controlled within +/-15 ℃.
Compared with the prior art, the invention has the beneficial effects that:
by setting a reasonable cross rolling process and a reasonable oriented silicon steel hot rolling process, the rolling stability of the oriented silicon steel is greatly improved, the strip shape of the oriented silicon steel is well controlled, the convexity is controlled within 30-50 mu m, the wedge shape is controlled within 30 mu m, and the plate shape flatness is controlled within 25 iu; thereby providing a high-quality raw material for the cold rolling process.
Detailed Description
The invention relates to a plate shape control method of an oriented silicon steel hot rolled steel strip, wherein the technological process of the oriented silicon steel hot rolled steel strip comprises a casting blank heating process, a rolling process and a laminar cooling process; wherein in the rolling process:
1) the method adopts a mode of cross rolling of the oriented silicon steel and the ordinary steel, and the ordinary steel transition material which is co-rolled with the oriented silicon steel is made of SPCC ordinary steel in each roll changing period of the working rolls;
2) in each working roll period, the number of the hot roll materials is controlled to be 8-13, the thickness of the hot roll materials is 2.8-4.0 mm, the thickness of the hot roll materials is reduced one by one, and the thickness change of 2 continuous steel strips is less than or equal to 0.5 mm;
3) the width of the plain steel and the width of the oriented silicon steel are less than or equal to 200mm, and the thickness of the plain steel and the thickness of the oriented silicon steel are less than or equal to 1.0 mm; the number of the matched and rolled material blocks with the same width specification is less than or equal to 12, and the matched and rolled material has 2-3 different width specifications in one roll changing period;
4) the general steel and the oriented silicon steel except the ironing roller material adopt a large cross rolling mode, namely 5-10 pieces of oriented silicon steel are rolled firstly, and then 5-10 pieces of matched rolling materials are rolled;
5) in a single working roll period, the number of rolling blocks is controlled to be 60-80.
The rolling comprises a rough rolling process and a finish rolling process, wherein the rough rolling process comprises rough rolling descaling, rough rolling SP width fixing machine rolling, rough rolling E1R1 rolling and rough rolling E2R2 rolling; the finish rolling process comprises finish rolling descaling, finish rolling vertical roller rolling and finish rolling F1-F7 rolling.
In the rough rolling process, the transverse temperature difference of a rough rolling plate blank is controlled within 30 ℃, the rough rolling adopts 1+5 rolling processes of 1 pass of R1 rolling and 5 passes of R2 rolling, and the total side pressure of the plate blank is not more than 45 mm; controlling the wedge shape of the rough rolling intermediate billet to be below 0.2mm, controlling the offset between the center line of the intermediate billet and the rolling center line not to exceed 15mm, and controlling the camber of the head of the intermediate billet, namely controlling the offset between the center line of the head and the rolling center line not to exceed 30 mm.
In the finish rolling process of F1-F7, the threading speed of F1 is controlled to be 0.7-1.2 m/s, and the first acceleration is controlled to be 0.08-0.15 m/s2And the steel throwing speed of F7 is controlled to be 10.5-11.4 m/s.
In the finish rolling process of F1-F7, the reduction rate of each pass is as follows: F1-F3 is more than or equal to 40 percent, F4-F6 are more than or equal to 20 percent and less than 40 percent, and F7 is less than 20 percent.
In the finish rolling process of F1-F7, a bending roll and a PC rolling mill are coordinated, and the outlet thickness of the front 3 rolling mills is gradually reduced within the range of 85-60T one by one; when F2-F4 are rolled, the angle set by the PC rolling mill is 0.6-0.3 degrees, and the angle is gradually decreased from frame to frame; the roll bending force of the rear 4-frame rolling mill is set to be 55-35T and is set from large to small.
And in the finish rolling process of F1-F7, the fluctuation range of the FDT of the outlet side temperature of the rolling mill is controlled within +/-15 ℃.
The design principle of the plate shape control method of the oriented silicon steel hot rolled steel strip is as follows:
1. a cross rolling process of oriented silicon steel and common steel;
1) the oriented silicon steel and the ordinary steel adopt a cross rolling mode, in each working roll changing period, the ordinary steel transition material matched with the oriented silicon steel in rolling is made of SPCC ordinary steel, the rolling load of the steel at high temperature is similar to that of the oriented silicon steel, and the mathematical model setting and learning are facilitated, so that the control accuracy is improved.
2) In each working roll period, the number of the hot rolling roll materials is controlled to be 8-13, the thickness of the hot rolling roll materials is 2.8-4.0 mm, the thickness of the hot rolling roll materials is reduced one by one, and the allowable change of the thickness of 2 continuous steel strips is less than or equal to 0.5mm, so that the roll achieves stable hot convexity, and good conditions are provided for stable rolling of the oriented silicon steel.
3) Plain steel batching specification: in order to ensure the stable rolling of the oriented silicon steel and the plain steel, the width of the plain steel-the width of the oriented silicon steel is controlled to be less than or equal to 200mm, and the thickness of the plain steel-the thickness of the oriented silicon steel is controlled to be less than or equal to 1.0 mm; in the roll material matching, the condition that the number of blocks with the same width specification exceeds 12 is avoided, 2-3 different width specifications are required to be arranged in the roll changing period, and the condition that the rolling kilometers are too long in the same width rolling to accelerate the abrasion of the rolls and influence the shape control of the oriented silicon steel is avoided.
4) In order to ensure the rolling stability, the common steel (except the ironing roller material) and the oriented silicon steel adopt a large cross rolling mode, namely 5-10 pieces of oriented silicon steel are rolled firstly, and then 5-10 pieces of matched rolling materials are rolled.
5) The number of the rolled blocks of a single working roll is controlled to be 60-80 steel blocks.
2. Hot rolling of oriented silicon steel;
1) in order to provide a good intermediate billet for finish rolling, the transverse temperature difference of a rough rolling plate billet is controlled within 30 ℃; the rough rolling adopts 1+5 rolling processes of 1 pass of R1 rolling and 5 passes of R2 rolling, and the total side pressure of the plate blank does not exceed 45 mm; before rolling, the vertical roller and the side guide plate are recalibrated, and the roll gap deviation is dynamically controlled, so that the wedge shape of the rough rolling intermediate billet is controlled to be below 0.2mm, the offset between the central line of the intermediate billet and the rolling central line is not more than 15mm, and the camber of the head of the intermediate billet is controlled, namely the offset between the head central line and the rolling central line is not more than 30 mm.
2) The reasonable finish rolling speed is favorable for ensuring the temperature and the rolling stability. The proper threading speed and the proper steel throwing speed are ensured, the shapes of the head plate and the tail plate of the rolled piece in the finish rolling threading and steel throwing processes are easy to adjust, and the improvement of the rolling stability and the control of the integral shape of the strip steel are facilitated. In the invention, the threading speed of F1 is controlled to be 0.7-1.2 m/s, and the first acceleration is controlled to be 0.08-0.15 m/s2F7 speed control of steel throwingThe thickness is 10.5 to 11.4 m/s.
3) The load distribution is optimized, the upper machine frame adopts large reduction, and the lower machine frame adopts small reduction, so that the rolling stability is improved, and the stability of plate shape control is ensured. In the invention, the reduction rate of each pass is as follows: F1-F3 is more than or equal to 40 percent, F4-F6 are more than or equal to 20 percent and less than 40 percent, and F7 is less than 20 percent.
4) In order to ensure the shape of the steel strip, the bending roll is matched with a PC rolling mill in a coordinated way. The outlet thickness of the first three rolling mills is thicker, the roll bending force can be set slightly larger, and the roll bending force is gradually reduced within the range of 85-60T. Setting angles of the PC rolling mills F2-F4 to be 0.6-0.3 degrees, and gradually decreasing from frame to frame. In order to ensure the rolling stability of the last four rolling mills, the roll bending force is set to be 55-35T and is set from large to small.
5) The oriented silicon steel is particularly sensitive to temperature, and the deformation resistance is greatly changed along with the fluctuation of the temperature, so that the control of the plate shape can be influenced, the temperature FDT at the outlet side of a rolling mill is required to be stable, and the fluctuation range of the FDT is limited within +/-15 ℃.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ example 1 ]
In the embodiment, the specification of the hot rolled oriented silicon steel strip is 2.3 multiplied by 1050 mm.
The matched rolling material is St12, and 10 roller materials are ironed; in a single working roll period, 30 pieces of oriented silicon steel and 30 pieces of cross rolling materials are crossed and rolled, and the oriented silicon steel and the rolling materials are crossed and rolled in a ratio of 5: 5.
The roll material preparation comprises: 3.0 × 1240mm specification 10 blocks, 2.75 × 1150mm specification 10 blocks, 2.5 × 1100 specification 10 blocks.
The transverse temperature difference of the rough rolling plate blank is 19 ℃, the rough rolling R1 and R2 adopt a 1+5 rolling process, the side pressure of the plate blank is 45mm, the wedge shape is 0.19mm, the offset of the central line of the middle blank and the rolling central line is 5mm, and the offset of the central line of the head and the rolling central line is 23 mm.
When finish rolling is carried out, the threading speed of F1 is 0.8m/s, and the first acceleration is 0.10m/s2F7 speed control of steel throwingThe rolling reduction of F1-F7 passes is respectively 51%, 47%, 42%, 38%, 26%, 24% and 12% at 10.6 m/s; roll bending forces F1-F7 are set to be 85t, 80t, 68t, 55t, 50t, 47t and 43t respectively, and angles F2-F4 PC of the PC rolling mill are set to be 0.55 degrees, 0.46 degrees and 0.40 degrees respectively; the fluctuation of the outlet side temperature FDT of the rolling mill is controlled within +/-13 ℃.
The convexity of the rolled steel strip is 31 μm, the wedge shape is 9 μm, and the flatness of the plate shape is 17 iu.
[ example 2 ]
In the embodiment, the specification of the hot rolled oriented silicon steel strip is 2.0 multiplied by 1060 mm.
The matched rolling material is SPCC, and 13 roller materials are scalded; in a single working roll period, 28 pieces of oriented silicon steel and 28 pieces of cross rolling material are crossed, and the oriented silicon steel and the rolling material are crossed and rolled in a ratio of 7: 7.
The roll material preparation comprises: 10 blocks of 2.8 × 1230mm specification, 10 blocks of 2.5 × 1180mm specification and 8 blocks of 2.25 × 1080 specification.
The transverse temperature difference of the rough rolling plate blank is 29 ℃, the rough rolling R1 and R2 adopt a 1+5 rolling process, the side pressure of the plate blank is 35mm, the wedge shape is 0.15mm, the offset of the central line of the middle blank and the rolling central line is 13mm, and the offset of the central line of the head and the rolling central line is 25 mm.
When finish rolling is carried out, the threading speed of F1 is 1.0m/s, and the first acceleration is 0.11m/s2F7 steel throwing speed is controlled at 11.0 m/s; the reduction rates of F1-F7 passes are respectively 48%, 43%, 40%, 35%, 28%, 24% and 10%; roll bending forces F1-F7 are respectively set to be 80t, 75t, 62t, 53t, 48t, 45t and 39t, angles F2-F4 PC of the PC rolling mill are respectively set to be 0.57 degrees, 0.45 degrees and 0.38 degrees, and the fluctuation of the FDT of the outlet side temperature of the rolling mill is controlled within +/-10 degrees.
The convexity of the rolled steel strip is 49 μm, the wedge shape is 18 μm, and the flatness of the plate shape is 24 iu.
[ example 3 ]
In the embodiment, the specification of the hot-rolled oriented silicon steel strip is 1.8 × 1010 mm.
The material for blending and rolling is DC01, and the material for ironing the roller is 12 blocks; in a single working roll period, 24 pieces of oriented silicon steel and 28 pieces of cross rolling materials are crossed, and the oriented silicon steel and the rolling materials are crossed and rolled in a ratio of 6: 7.
The roll material preparation comprises: 9 blocks of 2.7X 1200mm specification, 12 blocks of 2.5X 1130mm specification and 7 blocks of 2.5X 1100 specification.
The transverse temperature difference of the finish rolling plate blank is 13 ℃, the rough rolling R1 and R2 adopt a 1+5 rolling process, the side pressure of the plate blank is 40mm, the wedge shape is 0.08mm, the offset of the central line of the middle blank and the rolling central line is 8mm, and the offset of the central line of the head and the rolling central line is 15 mm.
When finish rolling is carried out, the threading speed of F1 is 1.2m/s, and the first acceleration is 0.15m/s2F7 steel throwing speed is controlled at 11.4 m/s; the pass reduction rates of F1-F7 are 47%, 44%, 41%, 34%, 27%, 24% and 9% respectively, the bending forces of F1-F7 are set to be 80t, 73t, 63t, 50t, 48t, 45t and 42t respectively, the PC angles of the PC rolling mills F2-F4 are set to be 0.50 degrees, 0.43 degrees and 0.35 degrees respectively, and the FDT fluctuation of the rolling mill outlet side temperature is controlled within +/-9 ℃.
The convexity of the rolled steel strip is 41 mu m, the wedge shape is 29 mu m, and the flatness of the plate shape is 17 iu.
[ example 4 ]
In the embodiment, the specification of the hot-rolled oriented silicon steel strip is 2.3 multiplied by 1100 mm.
The matched rolling materials are St12 and SPCC, and 8 roller materials are ironed; in a single working roll period, 30 pieces of oriented silicon steel and 30 pieces of cross rolling materials are crossed and rolled, and the oriented silicon steel and the rolling materials are crossed and rolled in a ratio of 10: 10.
The roll material preparation comprises: 3.2X 1250mm specification 10 blocks, 2.75X 1180mm specification 10 blocks and 2.3X 1150 specification 10 blocks.
The transverse temperature difference of the rough rolling plate blank is 15 ℃, the rough rolling R1 and R2 adopt a 1+5 rolling process, the side pressure of the plate blank is 38mm, the wedge shape is 0.15mm, the offset of the central line of the intermediate blank and the rolling central line is 3mm, and the offset of the central line of the head and the rolling central line is 10 mm.
When finish rolling is carried out, the threading speed of F1 is 0.9m/s, and the first acceleration is 0.09m/s2F7 steel throwing speed is controlled at 10.5 m/s; the pass reduction rates of F1-F7 are respectively 50%, 45%, 41%, 36%, 26%, 22% and 11%, the bending forces of F1-F7 are respectively set to be 85t, 81t, 63t, 54t, 48t, 46t and 44t, the PC angles of the PC rolling mills F2-F4 are respectively set to be 0.60 degrees, 0.42 degrees and 0.31 degrees, and the fluctuation of the FDT of the rolling mill outlet side temperature is controlled within +/-15 ℃. A
The convexity of the rolled steel strip is 37 μm, the wedge shape is 21 μm, and the flatness of the plate shape is 13 iu.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The method for controlling the shape of the oriented silicon steel hot rolled steel strip is characterized in that the technological process of the oriented silicon steel hot rolled steel strip comprises a casting blank heating process, a rolling process and a laminar cooling process; wherein in the rolling process:
1) the method adopts a mode of cross rolling of the oriented silicon steel and the ordinary steel, and the ordinary steel transition material which is co-rolled with the oriented silicon steel is made of SPCC ordinary steel in each roll changing period of the working rolls;
2) in each working roll period, the number of the hot roll materials is controlled to be 8-13, the thickness of the hot roll materials is 2.8-4.0 mm, the thickness of the hot roll materials is reduced one by one, and the thickness change of 2 continuous steel strips is less than or equal to 0.5 mm;
3) the width of the plain steel and the width of the oriented silicon steel are less than or equal to 200mm, and the thickness of the plain steel and the thickness of the oriented silicon steel are less than or equal to 1.0 mm; the number of the matched and rolled material blocks with the same width specification is less than or equal to 12, and the matched and rolled material has 2-3 different width specifications in one roll changing period;
4) the general steel and the oriented silicon steel except the ironing roller material adopt a large cross rolling mode, namely 5-10 pieces of oriented silicon steel are rolled firstly, and then 5-10 pieces of matched rolling materials are rolled;
5) in a single working roll period, the number of rolling blocks is controlled to be 60-80.
2. The method for controlling the plate shape of the oriented silicon steel hot-rolled steel strip according to claim 1, wherein the rolling comprises a rough rolling process and a finish rolling process, and the rough rolling process comprises rough rolling descaling, rough rolling SP width fixing machine rolling, rough rolling E1R1 rolling and rough rolling E2R2 rolling; the finish rolling process comprises finish rolling descaling, finish rolling vertical roller rolling and finish rolling F1-F7 rolling.
3. The method for controlling the plate shape of the oriented silicon steel hot-rolled steel strip as claimed in claim 2, wherein in the rough rolling process, the transverse temperature difference of a rough rolled plate blank is controlled within 30 ℃, the rough rolling adopts 1+5 rolling processes of 1 pass of R1 rolling and 5 passes of R2 rolling, and the total side pressure of the plate blank does not exceed 45 mm; controlling the wedge shape of the rough rolling intermediate billet to be below 0.2mm, controlling the offset between the center line of the intermediate billet and the rolling center line not to exceed 15mm, and controlling the camber of the head of the intermediate billet, namely controlling the offset between the center line of the head and the rolling center line not to exceed 30 mm.
4. The method as claimed in claim 2, wherein the F1 threading speed is controlled to 0.7-1.2 m/s and the first acceleration is controlled to 0.08-0.15 m/s during the finish rolling of F1-F72And the steel throwing speed of F7 is controlled to be 10.5-11.4 m/s.
5. The method for controlling the shape of the hot-rolled oriented silicon steel strip as claimed in claim 2 or 4, wherein the reduction ratio of each pass in the finish rolling F1-F7 is: F1-F3 is more than or equal to 40 percent, F4-F6 are more than or equal to 20 percent and less than 40 percent, and F7 is less than 20 percent.
6. The method for controlling the shape of the oriented silicon steel hot-rolled steel strip according to claim 2 or 4, wherein in the finish rolling process of F1-F7, a bending roll and a PC rolling mill are cooperatively matched, and the outlet thickness of the first 3 rolling mills is gradually reduced from one mill to another within the range of 85-60T; when F2-F4 are rolled, the angle set by the PC rolling mill is 0.6-0.3 degrees, and the angle is gradually decreased from frame to frame; the roll bending force of the rear 4-frame rolling mill is set to be 55-35T and is set from large to small.
7. The method for controlling the shape of the hot-rolled oriented silicon steel strip as claimed in claim 2 or 4, wherein the fluctuation range of the FDT at the outlet side of the rolling mill is controlled within +/-15 ℃ during the finish rolling of F1-F7.
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