CN112626447A - Atmosphere control process of high-magnetic-induction oriented silicon steel with excellent magnetism - Google Patents
Atmosphere control process of high-magnetic-induction oriented silicon steel with excellent magnetism Download PDFInfo
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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
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- 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
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- 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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- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- 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
- C21D11/00—Process control or regulation for heat treatments
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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
- C21D8/1222—Hot 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
- 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
- C21D8/1261—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 following hot 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
- 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
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
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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
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
- C21D8/1283—Application of a separating or insulating coating
Abstract
The invention relates to the technical field of oriented silicon steel, and discloses a method for preparing oriented silicon steel, which comprises the following steps: the method comprises the following steps: smelting, wherein molten steel is obtained after the smelting is refined by a converter and RH, air is introduced in the smelting process, the total air input is set to be 100-. This atmosphere control technology of high magnetic induction oriented silicon steel that magnetism is good, through in the flow of difference, add the content of certain ratio oxygen and nitrogen gas, the atmosphere control precision in every stage is effectually promoted, thereby it reaches excellently to obtain final high magnetic induction oriented silicon steel, avoided influencing final high magnetic induction oriented silicon steel magnetic force effect because of factors such as atmospheric pressure, flow, FeO content reduces in the slag, improve steel recovery rate and furnace lining life, and then also play the effect that reduces manufacturing cost, and carry out accurate atmosphere control, make in the smelting of carrying out high magnetic induction oriented silicon steel, make the effect of smelting better, make the magnetism of the high magnetic induction oriented silicon steel that the smelting comes out better.
Description
Technical Field
The invention relates to the technical field of oriented silicon steel, in particular to an atmosphere control process of high-magnetic-induction oriented silicon steel with excellent magnetism.
Background
Silicon steel has excellent magnetic properties such as low loss and low magnetostriction, and is the most important magnetic material in the power and electronic industries. Silicon steels are generally classified into oriented silicon steels and non-oriented silicon steels. Wherein, the oriented silicon steel is a preferred orientation which makes the finished product tissue present Gaussian texture by using the abnormal growth of secondary recrystallization of crystal grains. Because of the orientation characteristic of the finished product crystal grains, the axes of internal crystal lattices are parallel to the rolling direction as much as possible, and the material has good magnetic permeability in the rolling direction and can obtain high magnetic induction intensity, so the material is widely used for manufacturing transformer cores.
The existing high magnetic induction oriented silicon steel needs some atmosphere gas in the preparation process, and the existing process cannot be effectively controlled in the process of atmosphere input, so that the poor quality of the high magnetic induction oriented silicon steel is caused, the waste of raw materials is caused, the magnetic performance of the high magnetic induction oriented silicon steel prepared by the existing process is not good, and the requirement of subsequent use cannot be met, so that the produced high magnetic induction oriented silicon steel cannot be used, the resource waste to a certain extent is caused, and in the preparation process of the prior art, the process is complex and difficult to control, the needed nitrogen content is too high, and the required production cost is too high.
Disclosure of Invention
The atmosphere control process of the high-magnetic-induction oriented silicon steel with excellent magnetism provided by the invention has the advantages of effectively controlling the atmosphere, enhancing the magnetism of the high-magnetic-induction oriented silicon steel and reducing the production cost, and solves the problems in the background art.
The invention provides the following technical scheme: an atmosphere control process of high magnetic induction grain-oriented silicon steel with excellent magnetism comprises the following steps:
the method comprises the following steps: smelting, wherein molten steel is obtained after the smelting is refined by a converter and RH, air is introduced in the smelting process, the total air input is set to be 100 plus 300Nl/min, and the oxygen content in the introduced air is 20-21%;
step two: continuous casting, wherein molten steel is poured when the superheat degree is less than 50 ℃, the blank drawing speed is 0.8-1.0 m/min, and the thickness of a casting blank is 200-250 mm;
step three: hot rolling, wherein the heating temperature of a casting blank is 1180-1220 ℃, the heating time is 180-240 min, the rough rolling adopts a mode of 1 pass of a first rack and 3 passes of a second rack, 4 passes of rolling are carried out in total, and the thickness of an intermediate blank is 40-60 mm;
step four: normalizing, wherein a normalizing process adopts two-stage normalizing, the first stage is at 1060-1100 ℃ for 2-4 min, the second stage is at 850-900 ℃, the starting cooling temperature is 750-800 ℃, the water spraying temperature is 40-50 ℃, the water flow is 250-350 m3/h, nitriding is synchronously completed during normalizing, the normalizing nitriding temperature is 1050-1150 ℃, the time is 50-100 s, the dew point is 15-75 ℃, the atmosphere is 5-35% NH3 (volume percentage), and the rest gas is N2; after normalizing nitriding, the content of nitrogen permeated into the hot rolled plate is 60-250 ppm;
step five: cold rolling, wherein a sendzimir twenty-high roll mill is adopted for cold rolling, the total reduction rate is 84% -88%, 5-pass rolling is adopted, and aging rolling is adopted in the 3 rd pass;
step six: decarburization annealing, nitriding and coating MgO, wherein the decarburization annealing process is carried out at the decarburization temperature of 800-850 ℃, the heat preservation is carried out for 3-5 min, the atmosphere is a protective gas containing 10-20% of H2 and 90-80% of N2, and the humidifying temperature is 50-70 ℃; the nitriding treatment process is carried out by nitriding with NH3 in 75% H2+ 25% N2 (PH2O/PH2 is less than or equal to 0.04, and d.p. + -. 10-10 ℃) for 800-860 ℃ x 30 s; after coating the MgO coating, drying and sintering at 500-600 ℃, and then coiling;
step seven: a high-temperature annealing process, wherein the high-temperature annealing is firstly carried out at the speed of 50-100 ℃/H under the atmosphere of N2 to 600-650 ℃, then the heat preservation is carried out at the temperature for 5-10H under the protective atmosphere containing 75% of H2+ 25% of N2, then the temperature is increased to 1200 ℃ at the speed of 15-20 ℃/H, the atmosphere is protective gas containing 75% of N2+ 5% of H2 in the temperature rising process, pure H2 is adopted for protection at 1200 ℃, the heat preservation is carried out for 20-40H, then the temperature is reduced to below 800 ℃ at 50 ℃/H, and the annealing process is carried out when the temperature is reduced to less than 300 ℃ along;
and step eight, hot drawing, flattening annealing and coating an insulating layer, drying the coated insulating layer at the temperature of below 500 ℃, and drawing, flattening and annealing the coated insulating layer at the temperature of 800-900 ℃ with the elongation of 0.25% -0.75% to obtain the high-magnetic-induction oriented silicon steel with excellent magnetism.
Preferably, after the normalizing nitriding, the volume fraction of AlN particles with the size less than or equal to 300nm accounts for more than 60 percent of the total volume of the AlN particles by controlling a cooling process; and (4) normalizing and cooling, wherein the initial temperature of rapid cooling is 700-950 ℃, and the rapid cooling speed is 15-40 ℃/se when the temperature is reduced to 550 ℃.
Preferably, the silicon steel comprises the following chemical components in percentage by weight: c: 0.055 to 0.120%, Si: 2.9-4.0%, Mn: 0.05-0.20%, S: 0.005-0.010%, Als: 0.015-0.035%, N: 0.001 to 0.009%, Sn: 0.005-0.070%, and the balance of Fe and inevitable impurities.
Preferably, the surface of the high-temperature annealing plate is coated with an insulating coating, and the high-magnetic-induction oriented silicon steel with excellent magnetism is obtained through hot drawing, flattening and annealing.
Preferably, the MgO coating and the high-temperature annealing: the decarburized and annealed steel plate is subjected to MgO coating and high-temperature annealing in a bell-type furnace, wherein the annealing temperature is 1200-1250 ℃.
The invention has the following beneficial effects:
1. this atmosphere control technology of high magnetic induction oriented silicon steel that magnetism is good, through in the flow of difference, add the content of certain ratio oxygen and nitrogen gas, the atmosphere control precision of effectual promotion every stage, thereby it reaches well to obtain final high magnetic induction oriented silicon steel, avoided influencing final high magnetic induction oriented silicon steel magnetic force effect because of factors such as atmospheric pressure, flow, FeO content reduces in the slag, improve steel recovery rate and furnace lining life-span, and then also play the effect that reduces manufacturing cost, and carry out accurate atmosphere control, make in the smelting of carrying out high magnetic induction oriented silicon steel, make the effect of smelting better, the speed of smelting is faster, the quality of smelting has been guaranteed simultaneously, make the magnetism of the high magnetic induction oriented silicon steel that smelts out more good, be applicable to in the industrial production, whole smelting efficiency has been improved.
2. The atmosphere control process of the high-magnetic-induction oriented silicon steel with excellent magnetism synchronously finishes nitriding while normalizing, increases the content of carbon, increases gamma-phase during hot rolling, refines the structure of a hot rolled plate, and is fine deformation grains and small recrystallization grains which are distributed in a layered manner, primary grains are fine and uniform, and in addition, the high content of carbon can also improve the processability of hot rolling and cold rolling and prevent the hot rolled plate from generating transverse cracks; the smelting operation is easy, so that the normalized back plate has the nitrogen content meeting the requirement of the low-temperature oriented silicon steel, the nitriding process can be omitted during the decarburization annealing of the cold-rolled plate, the process requirement is simplified, and the nitriding process is carried out simultaneously in the normalizing process, so that the production efficiency is greatly improved, and the using amount of ammonia gas can be greatly saved.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an atmosphere control process for high magnetic induction grain-oriented silicon steel with excellent magnetic properties includes the following steps:
the method comprises the following steps: smelting, wherein molten steel is obtained after the smelting is refined by a converter and RH, air is introduced in the smelting process, the total air input is set to be 100 plus 300Nl/min, and the oxygen content in the introduced air is 20-21%;
step two: continuous casting, wherein molten steel is poured when the superheat degree is less than 50 ℃, the blank drawing speed is 0.8-1.0 m/min, and the thickness of a casting blank is 200-250 mm;
step three: hot rolling, wherein the heating temperature of a casting blank is 1180-1220 ℃, the heating time is 180-240 min, the rough rolling adopts a mode of 1 pass of a first rack and 3 passes of a second rack, 4 passes of rolling are carried out in total, and the thickness of an intermediate blank is 40-60 mm;
step four: normalizing, wherein a normalizing process adopts two-stage normalizing, the first stage is at 1060-1100 ℃ for 2-4 min, the second stage is at 850-900 ℃, the starting cooling temperature is 750-800 ℃, the water spraying temperature is 40-50 ℃, the water flow is 250-350 m3/h, nitriding is synchronously completed during normalizing, the normalizing nitriding temperature is 1050-1150 ℃, the time is 50-100 s, the dew point is 15-75 ℃, the atmosphere is 5-35% NH3 (volume percentage), and the rest gas is N2; after normalizing nitriding, the content of nitrogen permeated into the hot rolled plate is 60-250 ppm;
step five: cold rolling, wherein a sendzimir twenty-high roll mill is adopted for cold rolling, the total reduction rate is 84% -88%, 5-pass rolling is adopted, and aging rolling is adopted in the 3 rd pass;
step six: decarburization annealing, nitriding and coating MgO, wherein the decarburization annealing process is carried out at the decarburization temperature of 800-850 ℃, the heat preservation is carried out for 3-5 min, the atmosphere is a protective gas containing 10-20% of H2 and 90-80% of N2, and the humidifying temperature is 50-70 ℃; the nitriding treatment process is carried out by nitriding with NH3 in 75% H2+ 25% N2 (PH2O/PH2 is less than or equal to 0.04, and d.p. + -. 10-10 ℃) for 800-860 ℃ x 30 s; after coating the MgO coating, drying and sintering at 500-600 ℃, and then coiling;
step seven: a high-temperature annealing process, wherein the high-temperature annealing is firstly carried out at the speed of 50-100 ℃/H under the atmosphere of N2 to 600-650 ℃, then the heat preservation is carried out at the temperature for 5-10H under the protective atmosphere containing 75% of H2+ 25% of N2, then the temperature is increased to 1200 ℃ at the speed of 15-20 ℃/H, the atmosphere is protective gas containing 75% of N2+ 5% of H2 in the temperature rising process, pure H2 is adopted for protection at 1200 ℃, the heat preservation is carried out for 20-40H, then the temperature is reduced to below 800 ℃ at 50 ℃/H, and the annealing process is carried out when the temperature is reduced to less than 300 ℃ along;
and step eight, hot drawing, flattening annealing and coating an insulating layer, drying the coated insulating layer at the temperature of below 500 ℃, and drawing, flattening and annealing the coated insulating layer at the temperature of 800-900 ℃ with the elongation of 0.25% -0.75% to obtain the high-magnetic-induction oriented silicon steel with excellent magnetism.
After normalizing nitriding, controlling a cooling process to realize that the volume fraction of AlN particles with the size less than or equal to 300nm accounts for more than 60 percent of the total volume of AlN; and (4) normalizing and cooling, wherein the initial temperature of rapid cooling is 700-950 ℃, and the rapid cooling speed is 15-40 ℃/se when the temperature is reduced to 550 ℃.
Wherein the silicon steel comprises the following chemical components in percentage by weight: c: 0.055 to 0.120%, Si: 2.9-4.0%, Mn: 0.05-0.20%, S: 0.005-0.010%, Als: 0.015-0.035%, N: 0.001 to 0.009%, Sn: 0.005-0.070%, and the balance of Fe and inevitable impurities.
Wherein, the surface of the high-temperature annealing plate is coated with an insulating coating, and the high-magnetic-induction oriented silicon steel with excellent magnetism is obtained through hot drawing, flattening and annealing.
Wherein, MgO coating and high-temperature annealing: the decarburized and annealed steel plate is subjected to MgO coating and high-temperature annealing in a bell-type furnace, wherein the annealing temperature is 1200-1250 ℃.
Wherein, through in the flow of difference, add the content of oxygen and nitrogen gas of certain ratio, the atmosphere control precision in every stage of effectual promotion, thereby it reaches excellently to obtain final high magnetic induction oriented silicon steel, avoided influencing final high magnetic induction oriented silicon steel magnetic force effect because of factors such as atmospheric pressure, flow, FeO content in the slag reduces, improve steel recovery rate and furnace wall life-span, and then also play reduction in production cost's effect, and carry out accurate atmosphere control, make in the smelting of carrying out high magnetic induction oriented silicon steel, make the effect of smelting better, the speed of smelting is faster, the quality of smelting has been guaranteed simultaneously.
The nitriding is synchronously completed while the normalizing is carried out, the carbon content is increased, the gamma-phase is increased during the hot rolling by the carbon, the structure of the hot rolled plate is refined and is fine deformation grains and small recrystallization grains which are distributed in a layered manner, the primary grains are fine and uniform, and in addition, the carbon content can also improve the processability of the hot rolled plate and the cold rolled plate and prevent the hot rolled plate from generating transverse cracks; the smelting operation is easy, so that the normalized plate has the nitrogen content meeting the requirement of the low-temperature oriented silicon steel, the nitriding process can be omitted during the decarburization annealing of the cold-rolled plate, and the process requirement is simplified.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. An atmosphere control process of high magnetic induction grain-oriented silicon steel with excellent magnetism is characterized by comprising the following steps:
the method comprises the following steps: smelting, wherein molten steel is obtained after the smelting is refined by a converter and RH, air is introduced in the smelting process, the total air input is set to be 100 plus 300Nl/min, and the oxygen content in the introduced air is 20-21%;
step two: continuous casting, wherein molten steel is poured when the superheat degree is less than 50 ℃, the blank drawing speed is 0.8-1.0 m/min, and the thickness of a casting blank is 200-250 mm;
step three: hot rolling, wherein the heating temperature of a casting blank is 1180-1220 ℃, the heating time is 180-240 min, the rough rolling adopts a mode of 1 pass of a first rack and 3 passes of a second rack, 4 passes of rolling are carried out in total, and the thickness of an intermediate blank is 40-60 mm;
step four: normalizing, wherein a normalizing process adopts two-stage normalizing, the first stage is at 1060-1100 ℃ for 2-4 min, the second stage is at 850-900 ℃, the starting cooling temperature is 750-800 ℃, the water spraying temperature is 40-50 ℃, the water flow is 250-350 m3/h, nitriding is synchronously completed during normalizing, the normalizing nitriding temperature is 1050-1150 ℃, the time is 50-100 s, the dew point is 15-75 ℃, the atmosphere is 5-35% NH3 (volume percentage), and the rest gas is N2; after normalizing nitriding, the content of nitrogen permeated into the hot rolled plate is 60-250 ppm;
step five: cold rolling, wherein a sendzimir twenty-high roll mill is adopted for cold rolling, the total reduction rate is 84% -88%, 5-pass rolling is adopted, and aging rolling is adopted in the 3 rd pass;
step six: decarburization annealing, nitriding and coating MgO, wherein the decarburization annealing process is carried out at the decarburization temperature of 800-850 ℃, the heat preservation is carried out for 3-5 min, the atmosphere is a protective gas containing 10-20% of H2 and 90-80% of N2, and the humidifying temperature is 50-70 ℃; the nitriding treatment process is carried out by nitriding with NH3 in 75% H2+ 25% N2 (PH2O/PH2 is less than or equal to 0.04, and d.p. + -. 10-10 ℃) for 800-860 ℃ x 30 s; after coating the MgO coating, drying and sintering at 500-600 ℃, and then coiling;
step seven: a high-temperature annealing process, wherein the high-temperature annealing is firstly carried out at the speed of 50-100 ℃/H under the atmosphere of N2 to 600-650 ℃, then the heat preservation is carried out at the temperature for 5-10H under the protective atmosphere containing 75% of H2+ 25% of N2, then the temperature is increased to 1200 ℃ at the speed of 15-20 ℃/H, the atmosphere is protective gas containing 75% of N2+ 5% of H2 in the temperature rising process, pure H2 is adopted for protection at 1200 ℃, the heat preservation is carried out for 20-40H, then the temperature is reduced to below 800 ℃ at 50 ℃/H, and the annealing process is carried out when the temperature is reduced to less than 300 ℃ along;
and step eight, hot drawing, flattening annealing and coating an insulating layer, drying the coated insulating layer at the temperature of below 500 ℃, and drawing, flattening and annealing the coated insulating layer at the temperature of 800-900 ℃ with the elongation of 0.25% -0.75% to obtain the high-magnetic-induction oriented silicon steel with excellent magnetism.
2. The atmosphere control process of high magnetic induction grain-oriented silicon steel with excellent magnetism according to claim 1, characterized in that: after the normalizing nitriding, the volume fraction of AlN particles with the size less than or equal to 300nm accounts for more than 60 percent of the total volume of AlN by controlling a cooling process; and (4) normalizing and cooling, wherein the initial temperature of rapid cooling is 700-950 ℃, and the rapid cooling speed is 15-40 ℃/se when the temperature is reduced to 550 ℃.
3. The atmosphere control process of high magnetic induction grain-oriented silicon steel with excellent magnetism according to claim 1, characterized in that: the silicon steel comprises the following chemical components in percentage by weight: c: 0.055 to 0.120%, Si: 2.9-4.0%, Mn: 0.05-0.20%, S: 0.005-0.010%, Als: 0.015-0.035%, N: 0.001 to 0.009%, Sn: 0.005-0.070%, and the balance of Fe and inevitable impurities.
4. The atmosphere control process of high magnetic induction grain-oriented silicon steel with excellent magnetism according to claim 1, characterized in that: and coating an insulating coating on the surface of the high-temperature annealing plate, and performing hot drawing leveling annealing to obtain the high-magnetic-induction oriented silicon steel with excellent magnetism.
5. The atmosphere control process of high magnetic induction grain-oriented silicon steel with excellent magnetism according to claim 1, characterized in that: and (3) MgO coating and high-temperature annealing: the decarburized and annealed steel plate is subjected to MgO coating and high-temperature annealing in a bell-type furnace, wherein the annealing temperature is 1200-1250 ℃.
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