Raw material pure iron steel plate for low-P and low-S high-purity amorphous strip and production method of raw material pure iron steel plate

Abstract

The invention relates to the technical field of steel production, and discloses a low-P and S high-purity raw material pure iron steel plate for amorphous strips, which comprises the following chemical components in percentage by mass: less than or equal to 0.0015% of C, more than or equal to 0.50% of Si, less than or equal to 0.020% of Mn, less than or equal to 0.004% of P, less than or equal to 0.004% of S, less than or equal to 0.003% of Als, less than or equal to 0.008% of Cr, less than or equal to 0.008% of Ni, less than or equal to 0.008% of Cu, less than or equal to 0.005% of Ti, less than or equal to 0.004% of [O], less than or equal to 0.003% of N and the balance of Fe and inevitable impurities. The invention further discloses a production method of the raw material pure iron steel plate for the low-P and low-S high-purity amorphous strip. According to the raw material pure iron steel plate for the low-P and low-S high-purity amorphous strip and the production method of the raw material pure iron steel plate, the ultra-high-purity raw material pure iron steel plate can be obtained, the production process cost can be reduced, and the material yield can be increased.

Description

Technical Field

[0001] The invention relates to the technical field of steel production, and in particular to a raw material pure iron steel plate for low P, S high purity amorphous strip and a production method thereof. Background Art

[0002] Raw pure iron is a metal material with a very low carbon content. Its chemical composition is mainly iron, and the lower the other alloy elements, the better. The room temperature structure of raw pure iron is mainly ferrite. It is mainly used in amorphous strip, powder metallurgy, permanent magnetic materials, lithium batteries, soft magnetic and other industries. It is a typical high value-added product. During use, the raw pure iron is usually melted and specific precious elements are added to obtain a mixed molten metal liquid to make finished products such as rods, plates, and strips.

[0003] Due to the characteristics of the product, the amorphous strip industry requires high Si and extremely low C, Mn, P, S, Al, Ti, and O content. Al is one of the important molten steel deoxidation materials in the steelmaking process, which can ensure good deoxidation of the molten steel, but it is inevitable to produce Al2O3 inclusions during the deoxidation process and cause a certain amount of aluminum to remain in the molten steel. The P, S, Al, and Ti content and Al2O3 inclusions in the raw pure iron will cause nozzle blockage or strip breakage during the preparation of amorphous strips. Elements such as C, Mn, and O will greatly reduce the soft magnetic properties of the material. Therefore, it is extremely important to reduce the content of C, Mn, P, S, Al, Ti, and O in the raw pure iron for the raw pure iron used for amorphous strips.

[0004] As the raw material for smelting, raw pure iron is mixed and melted according to a certain weight and precious metal ratio. Due to equipment limitations, downstream customers have raised the requirements for round bars and small flame-cut billets for raw pure iron to improve the material yield. At present, there are two mainstream methods for raw pure iron in steel enterprises. One is to use converter smelting and continuous casting to produce slabs, and then cut them into small square billets or small square billets are further processed into φ20mm~90mm bars; the other is to use medium frequency furnace or electric furnace smelting to directly produce small square billets or wire rod production line to roll into φ20mm~90mm bars. Due to production process costs and material yield, a small number of pure irons are rolled in single sheets of medium plates, and then sheared by shearing machines to avoid flame cutting and burning of materials to produce thick plates for delivery.

[0005] Regarding the patent for producing raw material pure iron slab by converter smelting and continuous casting, the inventor conducted the following search:

[0006] Patent CN115261564A discloses a non-aluminum deoxidized raw material pure iron for amorphous soft magnetic thin strip and its preparation method. The obtained industrial pure iron has the following components in terms of mass percentage: [C]≤0.005%, [Si]≤1.0%, [Mn]≤0.06%, [P]≤0.015%, [S]≤0.010%, [Al]≤0.005%, [Ti]≤0.0040%, [N]≤0.0040%, T[O]≤0.0070%, and the rest is Fe and unavoidable impurities, and the Si content is required to be ≤1.0%, and T[O] is ≤0.0070%. Desulfurized and demanganized iron water is used, scrap steel is not added, and the manganese content of the converter end point is controlled by the converter double slag method; at the same time, in order to control the oxygen content of the molten steel without aluminum deoxidation, the silicon content in the molten steel is above 0.65%. This process does not add scrap steel, has a high cost, and has poor P and S purity, with a content greater than 80ppm.

[0007] Patent CN108559905A discloses a raw material pure iron for high-silicon amorphous and a production method thereof. The raw material pure iron produced has high silicon, low sulfur and low manganese, and has the characteristics of high quality, which can meet the application of producing amorphous materials. However, the raw material pure iron produced has high contents of residual elements C (>20ppm) and P (>100ppm). The high C content has a significant impact on the subsequent soft magnetic properties of amorphous strips, and the high P content affects the stability of the subsequent amorphous strip preparation process.

[0008] Regarding the patent for using medium frequency furnace or electric furnace to smelt and produce raw material pure iron slab, the inventor conducted the following search:

[0009] Patent CN102352421B discloses a process for smelting industrial pure iron using converter waste slag granular iron. Since the raw material is converter waste slag granular iron and the equipment uses a medium frequency induction furnace or a vacuum induction furnace for smelting, there are limitations. Patent CN105603312B discloses a method for manufacturing ultra-pure industrial pure iron, which uses EBT electric furnace smelting and adds lanthanum-cerium alloy for deoxidation and desulfurization, but the cost is relatively high.

[0010] Regarding the patent for producing raw material pure iron by single sheet rolling of medium plate, the inventor conducted the following search:

[0011] Patent CN114959488A discloses an industrial pure iron medium and thick plate and its production method. The production process route adopted is molten iron pretreatment - converter smelting + RH vacuum refining - continuous casting - cutting medium slab - billet heating - high-pressure water dephosphorization - rolling - air cooling finishing - inspection and delivery to warehouse, but the production efficiency is low. Summary of the invention

[0012] The purpose of the present invention is to address the deficiencies of the above-mentioned technology and provide a raw material pure iron steel plate for low P, S high purity amorphous strip and a production method thereof, which can not only obtain ultra-high purity raw material pure iron steel plate, but also reduce the production process cost and improve the material yield.

[0013] To achieve the above-mentioned purpose, the raw material pure iron steel plate for low P, S high purity amorphous strip designed by the present invention has the following chemical components in percentage by weight: C≤0.0015%, Si≥0.50%, Mn≤0.020%, P≤0.004%, S≤0.004%, Als≤0.003%, Cr≤0.008%, Ni≤0.008%, Cu≤0.008%, Ti≤0.005%, [O]≤0.004%, N≤0.003%, and the rest are Fe and unavoidable impurities.

[0014] A method for producing a raw material pure iron steel plate for low P, S high purity amorphous strip, comprising the following steps in sequence: molten iron pretreatment, converter smelting, alloy fine-tuning station, LF refining, RH refining, continuous casting, heating, rolling, cooling, coiling and cross-cutting.

[0015] Preferably, during molten iron pretreatment: 300 tons of molten iron with Mn≤0.25% are selected, the target [S]≤0.0010% after desulfurization of the molten iron, scrap steel with low nickel, copper and chromium content is used, the amount of scrap steel added is 15-22% of the mass of the molten iron, and the total time for adding scrap steel and mixing with iron is ≤16min.

[0016] Preferably, the converter smelting adopts the double slag method, the mass ratio of the total amount of main blown lime to molten iron is ≤5%, the mass ratio of the auxiliary blown lime added to molten iron is ≤0.67%, the converter main blow temperature target is ≤1550℃, the main blow [C] is ≤0.10%, and the endpoint oxygen control is ≥800ppm.

[0017] Preferably, during LF refining, the mass ratio of bauxite added to molten iron is ≤0.1%, lime is added in batches during strong stirring, in batches ≥3 times, and the mass ratio of each addition to molten iron is ≤0.17%, and the exit temperature is controlled at 1570±5°C.

[0018] Preferably, during RH refining: RH deoxidation is carried out in 3 stages, namely, early aluminum particle deoxidation + mid-term ferrosilicon deoxidation + final aluminum particle deoxidation and sampling, the mass ratio of the total content of added aluminum particles to molten iron is ≤0.083%, deoxidizing carbon powder is used for decarburization, the target temperature at the end of decarburization is 1585±5°C, the target carbon content at the end of decarburization is ≤15ppm, ferrosilicon is added for deoxidation and alloying at the end of decarburization, the target oxygen control range is ≤35ppm, aluminum particles are added according to the oxygen content, and the oxygen setting target is ≤25ppm.

[0019] Preferably, during continuous casting, the stopper rod argon blowing flow rate is ≥6NI / min, ultra-low carbon steel protective slag is used, the ingot head is cut ≥4.6m, and the tail is cut ≥4.6m.

[0020] Preferably, during heating, the slab furnace exit temperature is 1210-1250°C, the descaling inlet and outlet nozzles are all opened, all descaling water pressures are ≥180Bar, and the R2DT longitudinal temperature difference is ≤40°C.

[0021] Preferably, during rolling, the finishing temperature is 920±20°C, the convexity is controlled to be 40±20 μm, the wedge is controlled to be 0±20 μm, and the straightness is controlled to be ±150I.

[0022] Preferably, during cooling, a front-stage centralized cooling process is adopted, the head non-cooling section is eliminated, the coiling temperature is controlled at 650±20°C, the coiler tower type is controlled at ±50mm, the overflow edge is <20mm, and the coiling is air-cooled to room temperature. During cross-cutting, the cross-cutting production speed is 20-40m / s, the centering error range of the steel coil width is controlled within ±20mm, the longitudinal inclination of the straightening roller is controlled at ±2.0mm, and the lateral inclination is controlled at ±1.0mm.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1. It can obtain ultra-high purity raw material pure iron steel plates, significantly reducing production process costs and improving user material recovery rate;

[0025] 2. Its macrostructure: central porosity, central crack, corner crack, triangular area crack, Al2O3 inclusion, honeycomb bubble are all level 0, central segregation ≤B0.5; the microstructure is coarse ferrite structure, in which the ferrite volume fraction is ≥99%, the grain size is ≥6.0, the yield strength of the product is ≥180MPa, the tensile strength is ≥300MPa, the elongation A50 is ≥55%, the yield strength ratio is ≤0.65, the cold bending performance is 180°, and D=0a has no cracks. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a typical metallographic structure diagram of the steel plate prepared in Example 1 of the present invention;

[0027] Figure 2 This is a typical tensile curve of the steel plate prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] A raw material pure iron steel plate for low P, S and high purity amorphous strip, the chemical composition of which is as follows by mass percentage: C≤0.0015%, Si≥0.50%, Mn≤0.020%, P≤0.004%, S≤0.004%, Als≤0.003%, Cr≤0.008%, Ni≤0.008%, Cu≤0.008%, Ti≤0.005%, [O]≤0.004%, N≤0.003%, and the rest is Fe and unavoidable impurities.

[0030] The production method of the above-mentioned raw material pure iron steel plate for low P, S high purity amorphous strip is characterized by comprising the following steps in sequence: molten iron pretreatment, converter smelting, alloy fine-tuning station, LF refining, RH refining, continuous casting, heating, rolling, cooling, coiling and cross-cutting.

[0031] Among them, when pre-treating molten iron: select 300 tons of molten iron with Mn≤0.25%, the target [S]≤0.0010% after desulfurization of the molten iron, use scrap steel with low content of nickel, copper and chromium, the amount of scrap steel added is 15-22% of the mass of molten iron, and the total time for adding scrap steel and mixing iron is ≤16min.

[0032] The converter smelting adopts the double slag method, the mass ratio of the total amount of main blown lime to molten iron is ≤5%, the mass ratio of the auxiliary blown lime added to molten iron is ≤0.67%, the converter main blow temperature target is ≤1550℃, the main blow [C] is ≤0.10%, and the endpoint oxygen control is ≥800ppm.

[0033] During LF refining, the mass ratio of bauxite added to molten iron is ≤0.1%. Lime is added in batches during strong stirring, in batches ≥3 times, and the mass ratio of each addition to molten iron is ≤0.17%. The outlet temperature is controlled at 1570±5℃.

[0034] During RH refining: RH deoxidation is carried out in 3 stages, early aluminum particle deoxidation + mid-term ferrosilicon deoxidation + final aluminum particle deoxidation sampling, the mass ratio of the total content of added aluminum particles to molten iron is ≤0.083%, deoxidizing carbon powder is used for decarburization, the target temperature at the end of decarburization is 1585±5℃, the target carbon content at the end of decarburization is ≤15ppm, ferrosilicon is added for deoxidation and alloying at the end of decarburization, the target oxygen control range is ≤35ppm, aluminum particles are added according to the oxygen content, and the fixed oxygen target is ≤25ppm.

[0035] During continuous casting, the argon blowing flow rate of the stopper rod is ≥6NI / min, ultra-low carbon steel protective slag is used, the billet head is cut ≥4.6m, and the tail is cut ≥4.6m.

[0036] During heating, the slab furnace temperature is 1210-1250℃, the descaling inlet and outlet nozzles are all opened to maintain the surface quality, all descaling water pressures are ≥180Bar, and the R2DT longitudinal temperature difference is ≤40℃.

[0037] During rolling, the finishing temperature is 920±20℃, the convexity is controlled at 40±20μm, the wedge is controlled at 0±20μm, and the straightness is controlled at ±150I.

[0038] During cooling, the front-stage centralized cooling process is adopted, the head non-cooling section is eliminated, the coiling temperature is controlled at 650±20℃, the coiler tower type is controlled at ±50mm, the overflow edge is <20mm, and it is air-cooled to room temperature after coiling. When cross-cutting, the cross-cutting production speed is 20-40m / s, the centering error range of the steel coil width is controlled within ±20mm, the longitudinal inclination of the straightening roller is controlled at ±2.0mm, and the lateral inclination is controlled at ±1.0mm.

[0039] In the steelmaking process design, the present invention uses scrap steel with low nickel, copper and chromium content to reduce the content of impurity elements such as nickel, copper and chromium in the steel; adopts a double slag method to reduce the amount of slag in the steel as much as possible, thereby reducing the return of residual elements from the slag to the molten steel in the subsequent process, thereby improving the purity of the molten steel; the converter main blowing temperature target is ≤1550°C, the main blowing [C] is ≤0.10%, and the low main blowing temperature is conducive to the oxidation reaction of Mn. The content of Mn cannot be obtained in time during converter smelting, and the content of Mn can be predicted according to the C content; the free O content in the molten steel at the converter terminal is controlled to be above 0.0800%. A high terminal oxygen value is adopted to promote the oxidation of Mn into the slag, which is conducive to reducing the manganese content of the molten steel at the converter terminal, and the demanganese rate is ≥89% and the dephosphorization rate is ≥95%; ultra-low carbon steel protective slag is adopted to reduce the C in the protective slag from entering the molten steel to generate carbon increase; the head of the ingot is cut to ≥4.6m, and the tail is cut to ≥4.6m, so as to reduce the content of residual elements in the head and tail of the ingot, avoid downgrading and rejudgment of the head and tail ingots, and improve the yield rate.

[0040] In the rolling process design of the present invention, in order to maintain the surface quality of the raw pure iron plate, the inlet and outlet water nozzles of the descaling are all opened at one time, and the pressure of all descaling water is ≥180Bar; the R2DT longitudinal temperature difference is ≤40℃, so as to reduce the instability of the rolling force caused by the temperature fluctuation, and the finishing temperature of the finishing rolling is controlled to be 920±20℃ to reduce the rolling force fluctuation caused by the organizational change during the rolling process, so as to ensure the rolling stability of the subsequent finishing rolling unit; the convexity is controlled at 40±20μm, the wedge is controlled at 0±20μm, and the straightness is controlled at ±150I to ensure a good rolled plate shape; in addition, the cooling adopts the front-stage centralized cooling process and cancels the head non-cooling section. The raw pure iron has a low strength and does not need to be auxiliary coiled by adding the head non-cooling section, which can effectively reduce costs and improve benefits. In the cross-cutting process design, the cross-cutting production speed is selected as 20-40m / s, the centering error range of the steel coil width is controlled within ±20mm, the longitudinal inclination control of the straightening roller is: ±2.0mm, and the lateral inclination control is: ±1.0mm, which can effectively improve the plate shape and increase the yield rate.

[0041] Four groups of embodiments and two groups of comparative examples are listed to illustrate the implementation of this process, as shown in Table 1, which is a table of chemical compositions of the embodiments and comparative examples:

[0042] Table 1 Measured chemical composition of the examples (mass percentage, wt%)

[0043] serial number C Si Mn P S Als Cr Ni Cu Ti O N Example 1 0.0015 0.56 0.0188 0.0028 0.0019 0.0030 0.0049 0.0049 0.0071 0.0001 0.0035 0.0020 Example 2 0.0007 0.50 0.0173 0.0029 0.0022 0.0012 0.0044 0.0080 0.0063 0.0005 0.0030 0.0018 Example 3 0.0009 0.60 0.0171 0.0027 0.0025 0.0012 0.0080 0.0044 0.0069 0.0001 0.0040 0.0030 Example 4 0.0010 0.58 0.0200 0.0040 0.0040 0.0013 0.0039 0.0045 0.0080 0.0002 0.0027 0.0018 Comparative Example 1 0.0020 0.21 0.0460 0.0120 0.0050 0.0015 / / / 0.0010 0.0033 0.0035 Comparative Example 2 0.0020 0.25 0.0420 0.0120 0.0040 0.0016 / / / 0.0010 0.0035 0.0030

[0044] As shown in Table 2, the steelmaking process parameters of the embodiment and the comparative example are as follows:

[0045] Table 2 Main parameters of steelmaking in various embodiments and comparative examples

[0046]

[0047] As shown in Table 3, the main rolling process parameters and mechanical properties of the embodiments and comparative examples are shown:

[0048] Table 3 Main rolling process parameters and mechanical properties of each embodiment and comparative example

[0049]

[0050] As shown in Table 3, the yield strength of the product is ≥180MPa, the tensile strength is ≥300MPa, the elongation A50 is ≥55%, the yield strength ratio is ≤0.65, and the Figure 1 As shown in the figure, it is a typical metallographic structure diagram of the steel plate obtained in Example 1. The pickling macrostructure center segregation is ≤B0.5, the center looseness, center crack, corner crack, triangular crack, Al2O3 inclusion, honeycomb bubble are all 0 level, there is no white bright band, the microstructure is coarse ferrite structure, wherein the ferrite volume fraction is ≥99%, the grain size is ≥6.0, combined with Figure 2 As shown, it is a typical tensile curve of the steel plate prepared in Example 1, with cold bending performance of 180° and no cracks at D=0a.

[0051] It should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present invention are limited only by the scope of the claims.

[0052] The various aspects disclosed for describing the present specification and claims are merely examples, and therefore, the present specification and claims are not limited to the details shown. In the above description, when the detailed description of the related known functions or configurations is determined to be unnecessary to obscure the focus of the present specification and claims, the detailed description will be omitted.

[0053] In the case of using “including”, “having” and “comprising” described in the present specification, unless otherwise used, there may also be another part or other parts, and the terms used may generally be in the singular but may also represent the plural form.

[0054] Finally, it should be pointed out that the above content is a further detailed description of the invention in combination with specific implementation methods. It cannot be considered that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, simple replacements made without departing from the concept of the present invention should be regarded as belonging to the protection scope of the present invention. The above embodiments are only more representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there can be many variations. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

[0055] At the same time, it should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be construed as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present invention are limited only by the scope of the claims. The features of the various embodiments of the present invention may be partially or completely combined or spliced ​​with each other, and may be performed in various different configurations as those skilled in the art may fully understand. The embodiments of the present invention may be performed independently of each other, or may be performed together in a mutually dependent relationship.

[0056] For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, and the above structures should be regarded as belonging to the protection scope of the present invention.

Claims

1. A raw material pure iron steel plate for low P, S and high purity amorphous strip, characterized by: The mass percentage of its chemical composition is: C≤0.0015%, Si≥0.50%, Mn≤0.020%, P≤0.004%, S≤0.004%, Als≤0.003%, Cr≤0.008%, Ni≤0.008%, Cu≤0.008%, Ti≤0.005%, [O]≤0.004%, N≤0.003%, and the rest is Fe and unavoidable impurities.

2. A method for producing a raw material pure iron steel plate for amorphous strip with low P and S content and high purity as claimed in claim 1, characterized in that: The process includes the following steps in sequence: molten iron pretreatment, converter smelting, alloy fine-tuning station, LF refining, RH refining, continuous casting, heating, rolling, cooling, coiling and cross-cutting.

3. The method for producing the raw material pure iron steel plate for low P, S high purity amorphous strip as claimed in claim 2, characterized in that: When pre-treating molten iron: select 300 tons of molten iron with Mn ≤ 0.25%, the target [S] ≤ 0.0010% after desulfurization, use scrap steel with low nickel, copper and chromium content, the amount of scrap steel added is 15-22% of the mass of molten iron, and the total time for adding scrap steel and mixing iron is ≤ 16 minutes.

4. The method for producing the raw material pure iron steel plate for low P, S high purity amorphous strip as claimed in claim 2, characterized in that: The converter smelting adopts the double slag method, the mass ratio of the total amount of main blown lime to molten iron is ≤5%, the mass ratio of the auxiliary blown lime added to molten iron is ≤0.67%, the converter main blow temperature target is ≤1550℃, the main blow [C] is ≤0.10%, and the endpoint oxygen control is ≥800ppm.

5. The method for producing the raw material pure iron steel plate for low P, S high purity amorphous strip as claimed in claim 2, characterized in that: During LF refining, the mass ratio of bauxite added to molten iron is ≤0.1%. Lime is added in batches during strong stirring, in batches ≥3 times, and the mass ratio of each addition to molten iron is ≤0.17%. The outlet temperature is controlled at 1570±5℃.

6. The method for producing the raw material pure iron steel plate for low P, S high purity amorphous strip as claimed in claim 2, characterized in that: During RH refining: RH deoxidation is carried out in 3 stages, early aluminum particle deoxidation + mid-term ferrosilicon deoxidation + final aluminum particle deoxidation sampling, the mass ratio of the total content of added aluminum particles to molten iron is ≤0.083%, deoxidizing carbon powder is used for decarburization, the target temperature at the end of decarburization is 1585±5℃, the target carbon content at the end of decarburization is ≤15ppm, ferrosilicon is added for deoxidation and alloying at the end of decarburization, the target oxygen control range is ≤35ppm, aluminum particles are added according to the oxygen content, and the fixed oxygen target is ≤25ppm.

7. The method for producing the raw material pure iron steel plate for low P, S high purity amorphous strip as claimed in claim 2, characterized in that: During continuous casting, the argon blowing flow rate of the stopper rod is ≥6NI / min, ultra-low carbon steel protective slag is used, the head of the ingot is ≥4.6m, and the tail is ≥4.6m.

8. The method for producing the raw material pure iron steel plate for low P, S high purity amorphous strip as claimed in claim 2, characterized in that: During heating, the slab furnace temperature is 1210-1250℃, the descaling inlet and outlet nozzles are all opened, all descaling water pressures are ≥180Bar, and the R2DT longitudinal temperature difference is ≤40℃.

9. The method for producing the raw material pure iron steel plate for low P, S high purity amorphous strip as claimed in claim 2, characterized in that: During rolling, the finishing temperature is 920±20℃, the convexity is controlled at 40±20μm, the wedge is controlled at 0±20μm, and the straightness is controlled at ±150I.

10. The method for producing the raw material pure iron steel plate for low P, S high purity amorphous strip as claimed in claim 2, characterized in that: During cooling, the front-stage centralized cooling process is adopted, the head non-cooling section is eliminated, the coiling temperature is controlled at 650±20℃, the coiler tower type is controlled at ±50mm, the overflow edge is <20mm, and it is air-cooled to room temperature after coiling. When cross-cutting, the cross-cutting production speed is 20-40m / s, the centering error range of the steel coil width is controlled within ±20mm, the longitudinal inclination of the straightening roller is controlled at ±2.0mm, and the lateral inclination is controlled at ±1.0mm.

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