Preparation method of Cu-containing high-magnetic-induction oriented silicon steel based on enhancement of V-element inhibitor

Abstract

The invention belongs to the field of magnetic materials, and particularly relates to a preparation method of Cu-containing high-magnetic-induction oriented silicon steel based on enhancement of a V element inhibitor. The method comprises the following processes: alloy smelting and component regulation and control, continuous casting, casting blank heating, hot rolling, controlled cooling, coiling, acid pickling, first-stage cold rolling, degreasing, recrystallization, decarburization, nitriding, second-stage cold rolling, degreasing, magnesium oxide coating, baking, high-temperature annealing, uncoiling cleaning, stretching flattening annealing, tension coating, baking, laser scoring, coiling and the like. The oriented silicon steel product with the magnetic induction B8 larger than or equal to 1.91 T is obtained, the thickness specification is 0.15-0.27 mm, and the iron loss P17 / 50 ranges from 0.75 W / kg to 0.95 W / kg. The method has the main characteristics that by adding the V element, the sulfide precipitation state in the hot rolling process and the nitride precipitation state in the nitriding process are improved, the matrix inhibition capability is enhanced, and the secondary recrystallization grain Goss orientation accuracy is improved.

Description

Technical Field

[0001] The invention belongs to the field of magnetic materials, and in particular relates to a method for preparing Cu-containing high magnetic induction oriented silicon steel based on V element inhibitor enhancement. Background Art

[0002] As the most widely used functional metal material in national economic construction, silicon steel is used in important fields such as electricity, machinery, and aviation. It is closely related to improving energy efficiency, energy conservation and consumption reduction, and carbon dioxide emission reduction. It is a key material for upgrading power and electronic equipment. Oriented silicon steel is a type of steel with complex technology, high production difficulty, high equipment conditions and management requirements in steel production. It is also one of the important indicators to measure the development level of special steel in a country. Oriented silicon steel is widely used in various links of the power industry chain. It is mainly used to prepare the iron core of transformers. It is a key material for improving the efficiency and reducing energy consumption of power equipment. In recent years, with the promotion of energy-saving and emission reduction technologies in my country and other major national strategic plans, higher requirements have been put forward for high-end silicon steel products. The product structure of silicon steel is developing towards high magnetic induction and high grade. This provides opportunities and impetus for the sustainable development of the oriented silicon steel industry, and also puts forward higher requirements for the manufacturing technology of oriented silicon steel. Developing a new generation of high-performance, energy-saving and environmentally friendly oriented silicon steel is an inevitable choice for steel companies to improve product competitiveness under the situation of overcapacity in steel.

[0003] At present, there are two main technologies for preparing oriented silicon steel in my country: nitriding Hi-B (high magnetic induction) oriented silicon steel and Cu-containing, two-stage rolling method CGO (common magnetic induction) oriented silicon steel. The former is nitrided after decarburization annealing, so that N forms AlN with Al in the steel, which is the acquirer inhibitor method. This process completely abandons the previous technical route of the inherent inhibitor method, and there is no need to control the precipitation of AlN during hot rolling and normalizing. The heating temperature of the ingot can be reduced to 1150-1200℃, and the magnetic properties (B8) can still reach 1.90T. At present, Baowu and Shougang in my country both use this process for production. The main features of this technology are high yield rate and low cost, but the control of the components of the steelmaking and nitriding processes is extremely strict, and the surface quality and temperature control are very demanding, almost reaching the limit of the existing steel rolling heat treatment process. The latter was first proposed by Soviet engineers in the 1980s. Cu2S with a lower solid solution temperature was used to replace MnS and AlN as an inhibitor to hinder the grain growth of oriented silicon steel. A two-stage cold rolling method was subsequently used, and decarburization was performed during the intermediate annealing process. The heating temperature of the ingot can be reduced to 1250-1300°C, the magnetic properties are between CGO steel and Hi-B steel, and the magnetic induction intensity B8 is about 1.85-1.88T. The main features of this process are: ① The process is simplified, the nitriding process is omitted, and the decarburization is completed during the intermediate annealing process. After the second stage of cold rolling, only magnesium oxide is coated on the surface and baked, and then the coil is directly annealed at high temperature; ② The process has a high lower limit, and the yield and grade hit rate are both above 90%; ③ The rolling and heat treatment process requirements are relatively low, which is convenient for mass production; ④ The process redundancy is large. This is also the main process used by private silicon steel enterprises in my country at present.

[0004] In view of the great performance improvement potential of Cu-containing oriented silicon steel, a large number of studies have focused on how to improve the inhibitor capacity of Cu-containing oriented silicon steel in order to improve the accuracy of Goss grains, thereby increasing magnetic induction and reducing hysteresis loss. However, due to the upper limit of the heating temperature of the medium-temperature route ingot, the addition of aluminum nitride and manganese sulfide is limited, resulting in insufficient nitride precipitation elements and the inability to add more inhibitors. Therefore, in order to improve the magnetic induction and performance of Cu-containing oriented silicon steel, it is necessary to carry out innovative design of inhibitors based on the understanding of the action law of inhibitors. Summary of the invention

[0005] In view of the contradiction between the heating temperature of the ingot and the amount of inhibitor added in the preparation process of Cu-containing oriented silicon steel, the purpose of the present invention is to provide a method for preparing Cu-containing high magnetic induction oriented silicon steel based on V element inhibitor enhancement, innovatively propose V as a comprehensive inhibitor forming element, and connect various inhibitors in series to give full play to their inhibitory ability, which can meet the comprehensive requirements of copper-containing oriented silicon steel to improve magnetic induction and reduce iron loss.

[0006] The technical solution of the present invention is:

[0007] A method for preparing Cu-containing high magnetic induction oriented silicon steel based on V element inhibitor enhancement is carried out according to the following steps:

[0008] (1) Melting Cu-containing high magnetic induction oriented silicon steel, the composition of molten steel is controlled to be: C 0.025-0.050%; Si 2.90-3.30%; Mn 0.12-0.20%; V 0.012-0.023%; Al s 0.015~0.025%;Cu0.40~0.55%;S 0.0045~0.010%;N 0.0035~0.0060%;P≤0.01%;Ti≤0.0010%;Nb≤0.0015%;Cr≤0.01%;Fe balance;

[0009] (2) Continuous casting and hot rolling: Continuously casting molten steel, the thickness of the continuous casting billet is 180-230 mm, the heating temperature is 1260°C-1300°C, the thickness of the hot rolled strip is 2.3-2.65 mm, the final rolling temperature is controlled at 880-920°C, and laminar cooling is performed after hot rolling, and the coiling temperature is controlled at 480-560°C;

[0010] (3) After the hot-rolled steel coil is pickled, it is cold rolled, and the scale is broken by pulling and straightening to remove phosphorus, and the pickling liquid is a hydrochloric acid solution;

[0011] (4) First stage cold rolling, the strip coil is cold rolled for 3 to 5 times, and the first stage cold rolling reduction is controlled to be 60 to 75%;

[0012] (5) Intermediate decarburization and nitriding annealing

[0013] The decarburization annealing temperature is 820-840°C, the atmosphere is controlled to be 20-30 vol% H2+N2 balance, the dew point is controlled to be +20-30°C, and the decarburization time is controlled to be 2.5-4.0 min;

[0014] The nitriding temperature is 720-740°C, the atmosphere is controlled to be 40-50 vol% H2+5-8 vol% NH3+N2 balance, the dew point is controlled to be -30-50°C, the nitriding time is controlled to be 60-80s, and the nitriding amount is controlled to be 40-100ppm according to the initial strip nitrogen content, and the total nitrogen content after nitriding is controlled to be 110-160ppm;

[0015] (6) Second stage cold rolling: the strip coil is cold rolled for 3 to 5 times, and the reduction of the second stage cold rolling is controlled to be 55 to 75%;

[0016] (7) Degreasing, magnesium oxide coating and baking of cold-rolled steel coils;

[0017] (8) High temperature annealing to obtain perfect grains;

[0018] (9) The steel coil cooled after high temperature annealing is subjected to surface cleaning, flat stretching, tension coating, baking and scoring treatment to obtain the final Cu-containing high magnetic induction oriented silicon steel product.

[0019] The method for preparing Cu-containing high magnetic induction oriented silicon steel based on V element inhibitor enhancement, in step (1), when smelting Cu-containing high magnetic induction oriented silicon steel, the solid solubility product is controlled by controlling the composition as follows: C wt％ ×V wt％ :0.00075~0.0012;Al swt％ ×N wt％ ×V wt％ :0.00000120~0.00000260; S wt％ ×Mn wt％ ×V wt％ :0.0000010~0.0000032.

[0020] In the method for preparing Cu-containing high magnetic induction oriented silicon steel based on V element inhibitor enhancement, in step (3), the concentration of the hydrochloric acid solution used as the pickling solution is 10-15wt%.

[0021] In the method for preparing Cu-containing high magnetic induction oriented silicon steel enhanced by V element inhibitor, in step (8), the high temperature annealing temperature is 800-1200°C, the heating rate is controlled at 10-20°C / h, the insulation time is 50-70 hours, the atmosphere is high-purity hydrogen with a dew point of ≤-30°C, and then the furnace is cooled to room temperature.

[0022] The method for preparing Cu-containing high magnetic induction oriented silicon steel based on V element inhibitor enhancement is as follows: when smelting Cu-containing high magnetic induction oriented silicon steel, V 0.012-0.023%, Al s Under the conditions of 0.015-0.025% Nitrogen and 0.0035-0.0060% Nitrogen, 60-80 ppm of nitrogen atoms are additionally added through the nitriding process after intermediate decarburization, and the total nitrogen content after nitriding is controlled to be 110-160 ppm.

[0023] The method for preparing Cu-containing high magnetic induction oriented silicon steel based on V element inhibitor enhancement adopts Cu containing more than 0.4% as auxiliary inhibitor, and adopts a two-stage cold rolling process to produce oriented silicon steel products with a thickness specification of 0.15-0.27 mm.

[0024] In the method for preparing Cu-containing high magnetic induction oriented silicon steel based on V element inhibitor enhancement, in step (9), the technical indicators of the obtained Cu-containing high magnetic induction oriented silicon steel are as follows: Magnetic induction B 800 ≥1.91T, iron loss P 17 / 50It is 0.75~0.85W / kg.

[0025] The design concept of the present invention is:

[0026] The present invention is based on an in-depth understanding of the evolution mechanism of V element in the whole process of oriented silicon steel inhibitor, selects V as the inhibitor strengthening element, makes it run through the precipitation process of carbides and sulfides, and controls the content ratio design of two series of precipitation participating elements (Mn / Cu / V)S and (Al / V)(C / N) through binary and ternary solid solubility products. V atoms participate in the precipitation process of MnS in the form of VS during the solidification of the ingot, thereby refining the size of MnS precipitation particles and promoting their uniform distribution. In hot-rolled strip steel, two precipitations, VC and VN, tend to be formed, with a size between 5 and 10 nm. During the intermediate annealing process, during the decarburization annealing process, VC precipitation refines the recrystallization structure at the initial stage of annealing, and does not hinder decarburization after rapid decomposition. After nitriding, the V element acts as a N compound carrier to effectively supplement the problem of insufficient Al atom addition, thereby solving the problem that copper-containing oriented silicon steel cannot be nitrided. After searching, there is no patent or paper reporting on the process of controlling the precipitation of oriented silicon steel by introducing V atoms to participate in the precipitation process of sulfides, carbides and nitrides.

[0027] The book "Electrical Steel" (ISBN 978-7-5024-5895-9) written by Mr. He Zhongzhi mentioned on pages 383 and 384 that NbN and VN can be selected as auxiliary inhibitors for MnS single inhibitor oriented silicon steel. This is completely different from the control strategy of the present invention. In the present invention, the amount of precipitated elements added is limited by the multi-solubility product, and V atoms are controlled to form VS, VC and VN during solidification, billet heating, hot rolling, recrystallization and decarburization. This is to clarify the physical metallurgical principles at different stages and then design its control method, which is obviously different from the comparative example in which VN is used as the only precipitate.

[0028] Patent CN 100389222C discloses a method for improving the electromagnetic properties and bottom layer quality of copper-containing oriented silicon steel. The main feature is to control the surface oxygen content at different stages without special design for inhibitors.

[0029] Patent CN 101643881 B discloses a method for producing copper-containing oriented silicon steel, wherein the addition amount of inhibitor elements is: Mn 0.1% to 0.30%; Als 0.006% to 0.030%, Cu 0.4% to 0.7%, N 0.006% to 0.012%, S≤0.025%, and no other inhibitor elements are designed. In this comparative example, the content of aluminum nitride is directly increased, and the heating temperature of the ingot is required to be high, and it is difficult to obtain perfect secondary recrystallization. In the present invention, the addition amount of Mn / Als / S / N elements is reduced through the multi-element solid solubility product design, and multiple precipitations are effectively connected through the bridge effect of V to form a "relay" inhibitor effect.

[0030] Patent CN 105420597 B discloses a method for producing copper-containing low-temperature high-magnetic induction oriented silicon steel, which mainly strengthens the inhibition force by adding Sn elements such as grain boundary segregated atoms, which is essentially different from the present invention.

[0031] Patents CN 115679204 A and CN 116004961 A respectively disclose a production process for copper-containing oriented silicon steel. Both patents reduce the amount of Mn added based on CN 101643881 B, and do not introduce other inhibitor-forming elements, which is significantly different from the present invention.

[0032] Patents CN 115747650B and other patents are Hi-B steel production processes with nitriding as the core. The processes are characterized by normalization, nitriding, and single-stage cold rolling, which are significantly different from this patent and are not listed one by one.

[0033] Advantages and beneficial effects of the present invention:

[0034] 1. The present invention effectively connects sulfides and carbonitrides by adding V, so that the composite inhibitor achieves a relay inhibition effect, and more effective inhibition capacity improvement is achieved when a small amount of inhibitor is added;

[0035] 2. The present invention replaces part of the Al element with V, and then introduces the nitriding process into the denitrification link before the secondary cold rolling of the copper-containing oriented silicon steel, which effectively avoids the coarsening problem of aluminum nitride;

[0036] 3. The present invention significantly improves the magnetic induction and iron loss performance indicators of the process product without changing the preparation process of copper-containing oriented silicon steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Process flow chart of the present invention. DETAILED DESCRIPTION

[0038] like Figure 1As shown, the present invention provides a preparation technology of Cu-containing high magnetic induction oriented silicon steel based on V element inhibitor enhancement, through alloy smelting and composition control, continuous casting, billet heating, hot rolling-controlled cooling-coiling, pickling, one-stage cold rolling, degreasing-recrystallization-decarburization-nitriding, two-stage cold rolling, degreasing-magnesium oxide coating-baking, high temperature annealing, uncoiling cleaning-stretching flat annealing, tension coating-baking-laser scoring-coiling and other processes, to obtain a oriented silicon steel product with a magnetic induction B8 ≥ 1.91T or more, with a thickness specification of 0.15-0.27mm and an iron loss P 17 / 50 Between 0.75 and 0.95 W / kg.

[0039] Below, the present invention is further described in detail by examples.

[0040] Embodiment 1:

[0041] In this embodiment, the method for preparing Cu-containing high magnetic induction oriented silicon steel based on V element inhibitor enhancement includes the following steps:

[0042] (1) Melting molten steel, controlling the composition to be the following (mass fraction): C 0.025%; Si 2.90%; Mn 0.12%; V 0.012%; Al s 0.015%; Cu 0.40%; S 0.0045%; N 0.0060%; P 0.0037%; Ti 0.0009%; Nb 0.0012%; Cr 0.0041%; Fe balance.

[0043] (2) Continuous casting and hot rolling: The molten steel is continuously cast, the thickness of the continuous casting billet is 180-230 mm, the heating temperature is 1280°C, the thickness of the hot rolled strip is 2.65 mm, the final rolling temperature is controlled at 920°C, and laminar cooling is performed after hot rolling, and the coiling temperature is controlled at 480°C.

[0044] (3) After the hot-rolled strip is pickled, it is cold rolled and the scale is broken by tension leveling instead of shot peening for dephosphorization. The pickling solution is a hydrochloric acid solution with a concentration of 12 wt%.

[0045] (4) In the first stage of cold rolling, the strip coil is cold rolled through four passes to a thickness of 0.75 mm.

[0046] (5) Intermediate decarburization and nitriding annealing:

[0047] The decarburization annealing temperature is 820°C, the controlled atmosphere is 20vol% H2+N2 remainder, the dew point is controlled at +20°C, and the decarburization time is controlled at 2.5min; the nitriding temperature is 720°C, the controlled atmosphere is 40vol% H2+5vol% NH3+N2 remainder, the dew point is controlled at -30°C, and the nitriding time is controlled at 60s. According to the initial strip nitrogen content, the nitriding amount is controlled to 40ppm, and the total nitrogen content after nitriding is controlled to 110ppm.

[0048] (6) Second stage cold rolling: The strip coil is cold rolled in four passes, and the thickness after the second stage cold rolling is controlled to be 0.27 mm.

[0049] (7) Degreasing, magnesium oxide coating and baking of cold-rolled steel strip.

[0050] (8) High temperature annealing: The high temperature annealing temperature is 1200°C, the heating rate is controlled at 15°C / h, the holding time is 60 hours, the atmosphere is high-purity hydrogen with a dew point of ≤-30°C, and then the furnace is cooled to room temperature to obtain perfect grains.

[0051] (9) The steel coil cooled after high temperature annealing is subjected to surface cleaning, flat stretching, tension coating, baking and scoring to obtain the final product, magnetic induction B 800 It is 1.91T, and the iron loss is P17 / 50: 0.85W / kg.

[0052] Embodiment 2:

[0053] In this embodiment, the method for preparing Cu-containing high magnetic induction oriented silicon steel based on V element inhibitor enhancement includes the following steps:

[0054] (1) Melting molten steel, controlling the composition to the following content (mass fraction): C 0.045%; Si 3.30%; Mn 0.20%; V 0.023%; Al s 0.025%; Cu 0.55%; S 0.0080%; N 0.0060%; P 0.0018%; Ti 0.0007%; Nb 0.0013%; Cr 0.0039%; Fe balance.

[0055] (2) Continuous casting and hot rolling: The molten steel is continuously cast, the thickness of the continuous casting billet is 180-230 mm, the heating temperature is 1300°C, the thickness of the hot rolled strip is 2.3 mm, the final rolling temperature is controlled at 920°C, and laminar cooling is performed after hot rolling, and the coiling temperature is controlled at 550°C.

[0056] (3) After the hot-rolled strip is pickled, it is cold rolled and the scale is broken by tension straightening instead of shot peening for dephosphorization. The pickling solution is a 10% hydrochloric acid solution.

[0057] (4) In the first stage of cold rolling, the strip coil is cold rolled through four passes to a thickness of 0.68 mm.

[0058] (5) Intermediate decarburization and nitriding annealing:

[0059] The decarburization annealing temperature is 840°C, the controlled atmosphere is 30vol% H2+N2 remainder, the dew point is controlled to +30°C, and the decarburization time is controlled to 4.0min; the nitriding temperature is 740°C, the controlled atmosphere is 50vol% H2+8vol% NH3+N2 remainder, the dew point is controlled to -50°C, the nitriding time is controlled to 75s, and the total nitrogen content after nitriding is controlled to 160ppm.

[0060] (6) Second stage cold rolling: The strip coil is subjected to four passes of cold rolling, and the second stage of cold rolling is controlled to a thickness of 0.23 mm.

[0061] (7) Degreasing, magnesium oxide coating and baking of cold rolled steel strip.

[0062] (8) High temperature annealing: The high temperature annealing temperature is 1000°C, the heating rate is controlled at 20°C / h, the holding time is 60 hours, the atmosphere is high-purity hydrogen with a dew point of ≤-30°C, and then the furnace is cooled to room temperature to obtain perfect grains.

[0063] (9) The steel coil cooled after high temperature annealing is subjected to surface cleaning, flat stretching, tension coating, baking and scoring to obtain the final product, magnetic induction B 800 It is 1.92T, and the iron loss is P17 / 50: 0.75W / kg.

[0064] The implementation results show that the present invention is a two-stage rolling preparation process for Cu-containing oriented silicon steel based on V composite strengthening inhibitor and a process method for improving magnetic induction. The main characteristics are that by adding V element, the precipitation of sulfides during hot rolling and the precipitation state of nitrides during nitriding are improved, the matrix inhibition ability is enhanced, and the Goss orientation accuracy of secondary recrystallized grains is improved.

Claims

1. A method for preparing Cu-containing high magnetic induction oriented silicon steel based on V element inhibitor enhancement, characterized in that: Follow these steps: (1) Melting Cu-containing high magnetic induction oriented silicon steel, the composition of molten steel is controlled to be: C 0.025-0.050%; Si 2.90-3.30%; Mn 0.12-0.20%; V 0.012-0.023%; Al s 0.015~0.025%; Cu0.40~0.55%; S 0.0045~0.010%; N 0.0035~0.0060%; P≤0.01%; Ti≤0.0010%; Nb≤0.0015%; Cr≤0.01%; Fe balance; (2) Continuous casting and hot rolling: Continuously casting molten steel, the thickness of the continuous casting billet is 180-230 mm, the heating temperature is 1260°C-1300°C, the thickness of the hot rolled strip is 2.3-2.65 mm, the final rolling temperature is controlled at 880-920°C, and laminar cooling is performed after hot rolling, and the coiling temperature is controlled at 480-560°C; (3) After the hot-rolled steel coil is pickled, it is cold rolled, and the scale is broken by pulling and straightening to remove phosphorus, and the pickling liquid is a hydrochloric acid solution; (4) First stage cold rolling, the strip coil is cold rolled for 3 to 5 times, and the first stage cold rolling reduction is controlled to be 60 to 75%; (5) Intermediate decarburization and nitriding annealing The decarburization annealing temperature is 820-840°C, the atmosphere is controlled to be 20-30 vol% H2+N2 balance, the dew point is controlled to be +20-30°C, and the decarburization time is controlled to be 2.5-4.0 min; The nitriding temperature is 720-740°C, the atmosphere is controlled to be 40-50 vol% H2+5-8 vol% NH3+N2 balance, the dew point is controlled to be -30-50°C, the nitriding time is controlled to be 60-80s, and the nitriding amount is controlled to be 40-100ppm according to the initial strip nitrogen content, and the total nitrogen content after nitriding is controlled to be 110-160ppm; (6) Second stage cold rolling: the strip coil is cold rolled for 3 to 5 times, and the reduction of the second stage cold rolling is controlled to be 55 to 75%; (7) Degreasing, magnesium oxide coating and baking of cold-rolled steel strip; (8) High temperature annealing to obtain perfect grains; (9) The steel coil cooled after high temperature annealing is subjected to surface cleaning, flat stretching, tension coating, baking and scoring treatment to obtain the final Cu-containing high magnetic induction oriented silicon steel product.

2. The method for preparing Cu-containing high magnetic induction oriented silicon steel based on V element inhibitor enhancement according to claim 1, characterized in that: In step (1), when melting Cu-containing high magnetic induction oriented silicon steel, the solid solubility product is controlled by controlling the composition as follows: wt％ ×V wt％ :0.00075~0.0012;Al swt％ ×N wt％ ×V wt％ :0.00000120~0.00000260; S wt％ ×Mn wt％ ×V wt％ :0.0000010~0.0000032.

3. The method for preparing Cu-containing high magnetic induction oriented silicon steel based on V element inhibitor enhancement according to claim 1, characterized in that: In step (3), the concentration of the hydrochloric acid solution used as the pickling solution is 10 to 15 wt %.

4. The method for preparing Cu-containing high magnetic induction oriented silicon steel based on V element inhibitor enhancement according to claim 1, characterized in that: In step (8), the high temperature annealing temperature is 800-1200°C, the heating rate is controlled at 10-20°C / h, the holding time is 50-70 hours, the atmosphere is high-purity hydrogen with a dew point of ≤-30°C, and then the furnace is cooled to room temperature.

5. The method for preparing Cu-containing high magnetic induction oriented silicon steel based on V element inhibitor enhancement according to claim 1, characterized in that: When smelting Cu-containing high magnetic induction oriented silicon steel, adding V 0.012-0.023%, Al s Under the conditions of 0.015-0.025% N and 0.0035-0.0060%, an additional 60-80 ppm of nitrogen atoms is added through the nitriding process after intermediate decarburization, and the total nitrogen content after nitriding is controlled at 110-160 ppm.

6. The method for preparing Cu-containing high magnetic induction oriented silicon steel based on V element inhibitor enhancement according to claim 1, characterized in that: The thickness specification of the oriented silicon steel product produced by using a two-stage cold rolling process and containing more than 0.4% Cu as an auxiliary inhibitor is 0.15 to 0.27 mm.

7. The method for preparing Cu-containing high magnetic induction oriented silicon steel based on V element inhibitor enhancement according to any one of claims 1 to 6, characterized in that: In step (9), the technical indicators of the Cu-containing high magnetic induction oriented silicon steel obtained are as follows: 800 ≥1.91T, iron loss P 17 / 50 It is 0.75~0.85W / kg.

Images