CN110643801A - High magnetic induction oriented steel treatment process - Google Patents
High magnetic induction oriented steel treatment process Download PDFInfo
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- CN110643801A CN110643801A CN201911054007.0A CN201911054007A CN110643801A CN 110643801 A CN110643801 A CN 110643801A CN 201911054007 A CN201911054007 A CN 201911054007A CN 110643801 A CN110643801 A CN 110643801A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1233—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/04—Decarburising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1255—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest with diffusion of elements, e.g. decarburising, nitriding
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1272—Final recrystallisation annealing
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
Abstract
The invention relates to the field of steel processing, and particularly discloses a high magnetic induction oriented steel treatment process, which comprises the steps of preparing a steel plate; normalizing and pickling; cold rolling; decarburization annealing; nitriding treatment; annealing and coating a release agent; annealing at high temperature; coating an insulating coating film and performing stretching annealing; and (4) laser scoring. According to the scheme, before cold rolling, the steel plate is subjected to normalized pickling processing, iron oxide scales on the surface of the steel plate are removed, burrs and cracked edges on two sides of the steel plate are sheared, and during cold rolling thereafter, the surface of the steel plate is not prone to the accidents of edge cracking and fracture, so that the cold rolling efficiency of the steel plate is improved.
Description
Technical Field
The invention belongs to the field of steel processing, and particularly relates to a high magnetic induction oriented steel treatment process.
Background
10 new steel materials including high-performance silicon steel are the key points of the development of China in the next three years, and meet the industrial policy of China and the requirement of upgrading and updating of the transformer industry, high-magnetic induction oriented electrical steel in the high-performance silicon steel is a necessary material required in the power industry, and the development of the power industry is determined by the performance and updating of the high-magnetic induction oriented electrical steel.
In the production process of the high magnetic induction oriented electrical steel, the steel plate is limited by the reduction rate in cold rolling, and when the reduction rate is too low, the cold rolling efficiency of the steel plate can be greatly influenced, and the processing efficiency of the high magnetic induction oriented electrical steel is influenced; however, when the reduction ratio is too high, the accidents of edge cracking and fracture often occur, the strip steel layer and the strip steel layer are easy to adhere, the production efficiency is affected, a large amount of iron loss is caused, the magnetic performance of the oriented silicon steel is not high, and the production cost of the high-magnetic-induction oriented electrical steel is increased.
Disclosure of Invention
The invention aims to provide a high magnetic induction oriented steel treatment process capable of improving the cold rolling efficiency of a steel plate so as to improve the processing efficiency of the high magnetic induction oriented steel and reduce the iron loss of the high magnetic induction oriented steel.
In order to achieve the above object, the basic scheme of the invention is as follows: a high magnetic induction oriented steel treatment process comprises the following steps:
step 1: preparing a steel plate to be treated;
step 2: normalizing the steel plate in the step 1, and then pickling the steel plate;
and step 3: performing cold rolling processing on the steel plate after the acid washing, wherein the final reduction rate of the cold rolling is more than 80%, and the temperature of the steel plate is kept at 190-210 ℃ during the cold rolling;
and 4, step 4: performing decarburization annealing on the cold-rolled steel plate;
and 5: after decarburization annealing, introducing ammonia gas with high nitriding energy into the independent furnace section of the annealing furnace in the step 4, so that the ratio of the nitrogen element content in the steel plate to the aluminum element content in the steel plate is more than 2: 4;
step 6: coating an annealing release agent on the surface of the steel plate subjected to the nitriding treatment in the step 5;
and 7: annealing the steel plate at high temperature to generate recrystallized grains with the orientation of {110} <100 >;
and 8: coating an insulating coating film on the surface of the steel plate subjected to high-temperature annealing, and then performing stretching annealing;
and step 9: and carrying out laser scoring on the steel plate after the stretching annealing.
The principle and advantages of the basic scheme are as follows: before the cold rolling in the step 3, normalizing and pickling are carried out on the steel plate, after normalizing and pickling are carried out, iron oxide scales on the surface of the steel plate are damaged, the tensility of the surface of the steel plate is improved, and the surface of the steel plate is not easy to have the accidents of edge cracking and fracture during the cold rolling; under the technical guarantee, when the temperature of the steel plate is kept at 190-210 ℃ during cold rolling processing in the step 3, the toughness of the steel plate is further improved, and the final reduction rate of the cold rolling is controlled to be more than 80 percent, so that the surface of the steel plate can not be cracked or broken, and the iron loss is reduced; and the processing efficiency of cold rolling can be improved, and the processing efficiency of the whole steel plate is improved.
Meanwhile, after the steel plate is annealed in the step 4, crystal grains in the steel plate can be refined, deformation and cracks on the steel plate can be further reduced, and meanwhile, the quality of nitrogen and aluminum in the steel plate is controlled in the step 5, so that the content of the nitrogen can be effectively controlled, and the processed high-magnetic-induction oriented electrical steel has the characteristics of wear resistance, fatigue resistance, corrosion resistance and high-temperature resistance.
And 6 and 7, coating an annealing separant, forming recrystallized grains with the {110} <100> orientation in the steel plate effectively, refining the grains in the steel plate, further improving the wear resistance, fatigue resistance, corrosion resistance and high temperature resistance of the steel plate, preparing for the stretching annealing in the step 8, and avoiding the accidents of edge cracking and fracture of the steel plate in the process of stretching annealing.
Further, in step 3, the final reduction of the cold rolling is 80 to 91%.
With the support of step 2, the cold rolling in step 3 can control the final reduction to 80 to 91%, and the working efficiency of the cold rolling can be further improved.
Further, in the step 2, the steel plate is normalized by adopting two-stage normalization, and then shot blasting treatment is carried out on the steel plate.
In the shot blasting treatment process, the steel plate can be dephosphorized through normalization, the subsequent cold rolling processing is facilitated, meanwhile, the shot blasting treatment can strengthen the surface of the steel plate, and the surface crack of the steel plate in the cold rolling process is avoided.
Further, in the step 2, after shot blasting treatment is carried out on the steel plate, pickling processing is carried out on the steel plate; and during acid pickling, trimming the edge of the steel plate.
The pickling can further remove iron oxide scale on the surface of the steel plate and reduce the brittleness of the surface of the steel plate; the edge of the steel plate is cut, which aims at the cutting treatment of the irregular edge and is convenient for cold rolling processing.
Further, in step 5, after the nitriding treatment, the ratio of the nitrogen element content in the steel sheet to the aluminum element content in the steel sheet is more than 2: 3.
The content of nitrogen element is further increased relative to aluminum element, and the wear resistance, fatigue resistance, corrosion resistance and high temperature resistance of the processed high magnetic induction oriented electrical steel can be further improved.
Further, in step 4, when the decarburization annealing is performed, the steel sheet is heated to 770-900 ℃ and a protective atmosphere is used, the oxidation degree (PH2O/PH2) of the protective atmosphere is set, and the concentration of the carbon element is 25ppm or less and the concentration of the oxygen element is 600-700 ppm.
The concentration of the carbon element in the protective atmosphere is far lower than that of the oxygen element, so that the oxygen element can quickly consume the carbon element in the steel plate when decarburization annealing is guaranteed, the decarburization efficiency is effectively improved, and meanwhile the carbon element in the protective atmosphere can be prevented from entering the steel plate.
Further, in step 8, the thickness of the insulating coating film is such that the coating amount becomes 4.0 to 5.0g/m2。
The coating amount of the insulating coating film can ensure that the surface tension on the surface of the steel plate is increased, and the iron loss is reduced.
Further, in step 8, the thickness of the insulating coating film was such that the coating amount became 4.5g/m2。
Insulating coating film 4.5g/m2The coating amount of (2) can ensure that the tension on the surface of the steel plate is increased, and the waste of redundant insulating coating films is avoided.
Further, in step 3, the temperature of the steel sheet at the time of cold rolling was maintained at 195-.
The toughness of the steel plate is improved from the temperature, and the phenomena of edge cracking and fracture can not occur in cold rolling processing.
Further, in step 6, the annealing separator is MgO annealing separator or TiO2 annealing separator.
The use of the MgO annealing separator can enhance the annealing separation effect of the annealing separator.
Drawings
FIG. 1 is a structural sectional view in the front view direction of a pickling edge-cutting device in a high magnetic induction oriented steel treatment process in embodiment 2 of the invention;
FIG. 2 is a schematic view of the processing tube of FIG. 1 in a top view;
FIG. 3 is an enlarged view of the cutter of FIG. 2;
FIG. 4 is a view showing the state of the pickling edge-cutting device after the rotation of the rotating shaft in the high magnetic induction oriented steel treatment process in FIG. 1.
Detailed Description
The following is further detailed by the specific embodiments:
reference numerals in the drawings of the specification include: the device comprises a treatment pipe 10, a through hole 101, a baffle plate 102, a pickling opening 103, a scraper 104, a rotating shaft 20, a cutter 30, a fixture block 301, a cutter blade 302, an inlet pipe 401, an outlet pipe 402, a collecting tank 403, a filter screen 404 and a steel plate 50.
Example 1
Example 1 includes a high magnetic induction oriented steel treatment process, which includes the following specific steps:
step 1: preparing a steel plate to be treated;
step 2: the steel plate in the step 1 is normalized in two sections, in the first section of heating normalization, the temperature rising speed is 5-10 ℃/s, when the temperature rises to more than 1100 ℃, the temperature is preserved for 30 seconds, and then the temperature is immediately reduced; in the second stage of heating and normalizing, the annealing time is more than 15 ℃/s, the crystal grain structure in the steel plate keeps the layered interval, and the cooling speed is 50 ℃/s; then carrying out shot blasting treatment on the steel plate; then, carrying out acid pickling on the steel plate, and carrying out edge cutting treatment on the edge of the steel plate during acid pickling processing;
and step 3: performing cold rolling processing on the steel plate after the acid washing, wherein the final reduction rate of the cold rolling is 80-91%, and the temperature of the steel plate is kept at 195-205 ℃ during the cold rolling;
and 4, step 4: placing the cold-rolled steel plate into an annealing device for decarburization annealing, wherein when the decarburization annealing is carried out, a protective atmosphere is adopted when the steel plate is heated to 770-900 ℃, the oxidation degree (PH2O/PH2) of the protective atmosphere is realized, and the concentration of carbon element is less than or equal to 25ppm and the concentration of oxygen element is 600-700 ppm;
and 5: after decarburization annealing, introducing ammonia gas with high nitriding energy into the independent furnace section of the annealing furnace in the step 4, so that the ratio of the nitrogen element content in the steel plate to the aluminum element content in the steel plate is more than 2: 3;
step 6: coating an annealing release agent on the surface of the steel plate subjected to the nitriding treatment in the step 5, wherein the annealing release agent is an MgO annealing release agent taking MgO as a main agent;
and 7: annealing the steel plate at high temperature to generate recrystallized grains with the orientation of {110} <100 >;
and 8: coating an insulating coating film on the surface of the steel sheet after high-temperature annealing to a thickness of 4.5g/m2(ii) a Then carrying out stretching annealing;
and step 9: and carrying out laser scoring on the steel plate after the stretching annealing.
After the process is used, the high magnetic induction oriented steel produced by the process is detected, medium-sized coils of Hi-B steel with the specification of 0.27mm are subjected to decarburization and N penetration tests, and N penetration parameters of all positions at the head and the tail of a single coil of the high magnetic induction oriented steel are respectively measured during the detection, so that the test results in table 1 are obtained.
TABLE 1
As is clear from the data in Table 1, the amount of N penetration substantially reached the target value, and the C content after decarburization was less than 25ppm, which was acceptable.
Meanwhile, after the steel coil is treated according to a preset high-temperature annealing process, and then is coated with an insulating coating and subjected to stretching annealing, the iron loss condition of the three-coil processed high-magnetic-induction oriented steel is tested, the three-coil processed high-magnetic-induction oriented steel is marked as coil I, coil II and coil III, the coil I, the coil II and the coil III are medium-sized coils, the total amount of which reaches 7.9 tons, and the data in the table 2 are obtained after the iron loss condition test.
TABLE 2
As can be seen from the data in Table 2, the minimum iron loss reaches 0.99w/kg, compared with the iron loss value of 1.5-2w/kg in the prior art, the process obviously achieves the purpose of reducing the iron loss, simultaneously the first coil, the second coil and the third coil all reach the level of 27QG110, and the performance of the whole high magnetic induction oriented steel is improved.
Example 2
Embodiment 2 is different from embodiment 1 in that, while preparing the steel plate 50 to be processed in step 1, the pickling edge-cutting device shown in fig. 1, fig. 2, fig. 3 and fig. 4 is prepared, which comprises a pickling mechanism and a recovery mechanism, wherein the pickling mechanism comprises a processing tube 10 and a rotating shaft 20, the axis of the processing tube 10 is horizontally arranged, the rotating shaft 20 is coaxially and fixedly bonded on the front end of the processing tube 10, the processing tube 10 is provided with a through hole 101 for the steel plate 50 to horizontally pass through along the radial direction, a baffle plate 102 opposite to the side surface of the steel plate 50 is arranged at the through hole 101, and the baffle plate 102 is fixedly bonded with the cross section of the through hole 101 of the processing tube 10; as shown in FIG. 1, the upper and lower baffle plates 102 are provided with a plurality of pickling ports 103 communicating with the treatment tube 10, and the cross-sectional area of the end of the pickling port 103 close to the steel plate 50 is larger than the cross-sectional area of the end of the pickling port 103 far from the steel plate 50, so that the sulfuric acid aqueous solution sprayed from the pickling port 103 is sprayed, the coverage of the side surface of the steel plate 50 with the sulfuric acid aqueous solution sprayed from a single pickling port 103 is enlarged, and the surface of the steel plate 50 is completely pickled.
Four scrapers 104 are arranged on the outer wall of the processing tube 10, the four scrapers 104 are mounted in the through hole 101 of the processing tube 10 in a buckled manner, the lower surface of the upper scraper 104 is attached to the upper surface of the steel plate 50, and the upper surface of the lower scraper 104 is attached to the lower surface of the steel plate 50.
As shown in fig. 2, four cutters 30 are arranged on the outer wall of the treatment tube 10, the cutters 30 are in a multi-step shape as shown in fig. 3, a fixture block 301 which is connected with the through hole 101 of the treatment tube 10 in a buckling manner is arranged on the left side of each cutter 30, the right end of each cutter 30 is in a triangular prism shape, the rightmost vertical plane of each cutter 30 can be attached to the horizontal plane of the steel plate 50 as shown in fig. 2, a cutter blade 302 is formed at the splicing position of the inclined plane of each cutter 30 and the rightmost vertical plane of each cutter 30, and the cutter blade 302 is arranged on one side far away from the treatment.
As shown in fig. 1, the recycling mechanism includes a suction pump (not shown), an inlet pipe 401, an outlet pipe 402, and an inclined collecting tank 403, a filter screen 404 is horizontally and fixedly bonded in the collecting tank 403, one end of the inlet pipe 401 is communicated with the suction pump, the other end of the inlet pipe 401 is communicated with the collecting tank 403, and the communication position of the inlet pipe 401 and the collecting tank 403 is located below the filter screen 404; one end of the outlet pipe 402 communicates with the suction pump, the other end of the outlet pipe 402 communicates with the front end of the treatment pipe 10, and the communication position of the outlet pipe 402 with the treatment pipe 10 is located below the through hole 101.
When the steel plate 50 is subjected to pickling and edge cutting in step 2, the steel plate 50 is conveyed to the through hole 101 of the treatment pipe 10, the suction pump is in an on state, the suction pump sucks the sulfuric acid aqueous solution through the inlet pipe 401, and the sulfuric acid aqueous solution enters the treatment pipe 10 through the inlet pipe 401, the suction pump and the outlet pipe 402; at this time, the steel plate 50 is inserted into the through hole 101 from left to right, so that the upper and lower sides of the steel plate 50 as shown in fig. 2 are abutted against the cutter blade 302, the cutter blade 302 performs trimming processing on the excess steel plate 50, and the scraper 104 scrapes off impurities on the upper surface and the lower surface of the steel plate 50 as shown in fig. 1; the steel plate 50 enters the through hole 101 after trimming and impurity removal, the periphery of the steel plate 50 is opposite to the baffle plate 102, sulfuric acid aqueous solution sprayed from the pickling ports 103 on the upper side and the lower side is sprayed on the steel plate 50, and surface pickling is carried out on each side surface of the steel plate 50; in the pickling process, the rotating shaft 20 is rotated to enable the through hole 101 to be in an inclined state shown in fig. 4, the sulfuric acid aqueous solution flows obliquely to the left during pickling, the sulfuric acid aqueous solution is rapidly recovered into the collecting groove 403, meanwhile, impurities scraped by the scraper 104 conveniently enter the collecting groove 403, and the scraps subjected to edge cutting conveniently enter the collecting groove 403; after entering the collecting tank 403, the scraps and the impurities are blocked above the sulfuric acid aqueous solution by the filter screen 404, so that the reaction time of the sulfuric acid aqueous solution with the scraps and the impurities can be shortened, and the sulfuric acid aqueous solution is prevented from being rapidly invalid.
Claims (10)
1. The high magnetic induction oriented steel treatment process is characterized by comprising the following steps of:
step 1: preparing a steel plate to be treated;
step 2: normalizing the steel plate in the step 1, and then pickling the steel plate;
and step 3: performing cold rolling processing on the steel plate after the acid washing, wherein the final reduction rate of the cold rolling is more than 80%, and the temperature of the steel plate is kept at 190-210 ℃ during the cold rolling;
and 4, step 4: performing decarburization annealing on the cold-rolled steel plate;
and 5: after decarburization annealing, introducing ammonia gas with high nitriding energy into the independent furnace section of the annealing furnace in the step 4, so that the ratio of the nitrogen element content in the steel plate to the aluminum element content in the steel plate is more than 2: 4;
step 6: coating an annealing release agent on the surface of the steel plate subjected to the nitriding treatment in the step 5;
and 7: annealing the steel plate at high temperature to generate recrystallized grains with the orientation of {110} <100 >;
and 8: coating an insulating coating film on the surface of the steel plate subjected to high-temperature annealing, and then performing stretching annealing;
and step 9: and carrying out laser scoring on the steel plate after the stretching annealing.
2. The process for treating high magnetic induction oriented steel according to claim 1, wherein in the step 3, the final reduction rate of cold rolling is 80-91%.
3. The process for treating the high-magnetic-induction oriented steel according to claim 2, wherein in the step 2, the steel plate is normalized by adopting two-stage normalization, and then shot blasting is carried out on the steel plate.
4. The high magnetic induction oriented steel treatment process according to claim 3, wherein in the step 2, after the steel plate is subjected to shot blasting treatment, the steel plate is subjected to pickling processing; and during acid pickling, trimming the edge of the steel plate.
5. The process of claim 4, wherein in the step 5, after the nitriding treatment, the ratio of the content of nitrogen elements in the steel plate to the content of aluminum elements in the steel plate is greater than 2: 3.
6. The process as claimed in claim 5, wherein the step 4 is performed by heating the steel sheet to 770-900 ℃ in the decarburization annealing in a protective atmosphere having an oxidation degree (P)H2O/PH2) 0.35-0.45, and the content of carbon element is less than or equal to 25ppm, and the concentration of oxygen element is 600-700 ppm.
7. The process of claim 6, wherein in step 8, the thickness of the insulating coating film is set to 4.0-5.0g/m2。
8. The process of claim 7, wherein in step 8, the thickness of the insulating coating film is set to 4.5g/m2。
9. The process as claimed in claim 8, wherein the temperature of the steel sheet in the cold rolling process is maintained at 195-205 ℃.
10. The process for treating high magnetic induction oriented steel according to claim 9, wherein in the step 6, the annealing separator is MgO annealing separator or TiO2 annealing separator.
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