CN116024418A - Low-temperature high-magnetic induction oriented silicon steel production method based on grain homogenization control - Google Patents
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Abstract
The application provides a low-temperature high-magnetic induction oriented silicon steel production method based on grain homogenization control, which comprises the following process steps of steel making, continuous casting, blank heating, hot rolling, normalizing, primary cold rolling, decarburization nitriding, high-temperature annealing and stretching leveling of oriented silicon steel. The invention determines the heating temperature according to the chemical components, determines the normalizing temperature through the heating temperature and the actual chemical components, determines the decarburization annealing temperature through the normalizing temperature, and simultaneously determines the hot rolling and cold rolling processes according to the grain homogenization principle. In the production of high magnetic induction oriented silicon steel, the processes of the processes are mutually influenced, and the invention has the advantages that the post-process is formulated according to the pre-process, and the primary recrystallized grains of decarburization annealing tend to be uniform through the repeated grain recrystallization control of the processes of hot rolling, normalizing, annealing and the like, so that the good magnetic property is finally obtained.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a low-temperature high-magnetic induction oriented silicon steel production method based on grain homogenization control.
Background
The production process flow of the high-temperature high-magnetic induction oriented silicon steel mainly comprises the working procedures of smelting, hot rolling, normalizing, cold rolling, decarburizing, nitriding, high-temperature annealing, stretching and flattening and the like, and the processes of all the working procedures are related and mutually influenced. The recrystallization in which decarburization annealing occurs is called primary recrystallization, and the abnormal growth of GOSS grains during high-temperature annealing is called secondary recrystallization. In the production of high magnetic induction oriented silicon steel, the grain size and uniformity of primary recrystallization have an important influence on secondary recrystallization. The uniform and proper primary recrystallization grains are favorable for secondary recrystallization to obtain grains with more accurate orientation, thereby obtaining higher magnetic induction intensity. This is well documented in many documents. However, the processes of steelmaking, continuous casting, hot rolling, normalizing, cold rolling and decarburization annealing have an influence on the homogenization of primary recrystallized grains, so that the processes of the above processes are required to be linked in order to control the homogenization of primary recrystallized grains and improve the magnetic properties of the product.
The Chinese patent document of patent application number 201110295909.0 discloses a method for producing oriented silicon steel with excellent magnetic properties, and describes a method for controlling the numerical value and the proportion of the primary recrystallized grain size of the surface layer and the central layer of a primary recrystallized plate within a proper range by adjusting the friction force (shearing stress) born by the surface of the steel plate during cold rolling, thereby achieving the purpose of influencing the distribution of the primary recrystallization along the thickness direction, realizing the homogenization of the primary recrystallized grain size along the thickness direction and finally realizing the optimization of the magnetic properties of a finished product. However, the method for improving the uniformity of the crystal grains by adjusting the friction force through the rolling oil has higher requirements on cold rolling equipment and needs accurate detection equipment; on the other hand, there is a limit to its improvement ability.
The Chinese patent document of patent application number 201910348330.2 discloses a production method of a thin-specification low-temperature high-magnetic induction oriented silicon steel strip, and describes a method for improving poor performance stability of low-temperature Bao Guige high-magnetic induction oriented silicon steel, improving magnetic performance of the thin-specification high-magnetic induction oriented silicon steel and improving uniformity of performance in a plate width direction. In the decarburization annealing step, the influences of Al, N, si and the hot rolling finishing temperature are considered, and a certain effect is obtained. However, the method ignores the influence of Mn, S, cu and other elements forming another important inhibitor and the normalizing process on the decarburization annealing temperature, and has great limitation on the control of the inhibitor and the homogenization control of primary recrystallized grains, and meanwhile, the difference of nitriding temperatures is not beneficial to mass production and the stability of the atmosphere in the furnace, so that the low-temperature high-magnetic induction oriented silicon steel production method based on the grain homogenization control is provided to solve the problems.
Disclosure of Invention
The invention mainly aims to provide a low-temperature high-magnetic induction oriented silicon steel production method based on grain homogenization control, which is a production method for improving the magnetic performance of a final product by promoting primary recrystallization grain homogenization through linkage design of steelmaking, continuous casting, hot rolling, normalizing, cold rolling and decarburization annealing processes.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a low-temperature high-magnetic induction oriented silicon steel production method based on grain homogenization control comprises the following steps: the primary recrystallized grains are homogenized through the linkage design of the technological parameters of each procedure, and the steps are as follows:
step one: the mass percent control range of the chemical components is as follows: c:0.05 to 0.07 percent; si:2.9 to 3.5 percent; mn:0.05 to 0.15 percent; p: less than or equal to 0.030%; s: 0.005-0.010%; als:0.02 to 0.035 percent; n: 0.0060-0.010%; sn:0.05 to 0.10 percent; cr: less than or equal to 0.30 percent; cu: less than or equal to 0.60 percent; the balance of Fe and unavoidable impurity elements;
step two: the continuous casting adopts a high-pulling-speed forced cooling process and electromagnetic stirring, so that the proportion of coarse columnar crystals is reduced, the proportion of equiaxial crystals is controlled to be 30-50%, and the thickness of a casting blank is 200-250 mm;
step three: the slab obtained after continuous casting enters a heating furnace at the temperature of more than 500 ℃ and is heated for 200-300 min;
step four: rolling the heated plate blank into a steel belt with the specification of 2.1-2.5 mm by a continuous rolling mill, wherein the rough rolling pass adopts a large rolling reduction rate, the recrystallization of crystal grains is promoted, the deformation rate of the rough rolling pass is controlled to be 40-50%, the rolling reduction rate of the finish rolling pass is sequentially reduced from 50% to 20%, and the final rolling temperature is 900-1000 ℃;
step five: the hot rolled steel strip is subjected to two-stage normalizing, wherein the normalizing temperature of the first stage is determined according to the chemical composition of the steel strip, and the normalizing temperature of the second stage is 900 ℃, and the total furnace time is 4.5min. Water cooling is adopted after discharging, and the cooling speed is 40 ℃/s;
step six: after normalizing, rolling the steel strip by a twenty-high cold rolling mill, and performing primary cold rolling to obtain a finished product with the thickness of 0.27mm, wherein the total rolling reduction is 87-90%, the pass rolling reduction is controlled from large to small in sequence, and the ageing rolling temperature is controlled at 150-250 ℃;
step seven: the cold rolled steel strip is subjected to decarburization and nitriding in an annealing process, and coiled into a steel coil after being coated with magnesium oxide, wherein the temperature rising speed of the steel strip in a furnace is controlled to be 20-50 ℃/s, the decarburization annealing temperature is determined according to the normalizing temperature, the nitriding adopts two-stage nitriding, the nitriding temperature of the first stage is 850 ℃, the nitriding temperature of the second stage is 800 ℃, and the total furnace time is 3min.
Step eight: heating to 700 ℃ at full speed under N2 atmosphere, preserving heat for 20 hours under nitrogen-hydrogen mixed gas atmosphere with the volume fraction of hydrogen being 40%, heating to 1200 ℃ at the heating rate of 18 ℃/H under ammonia decomposition gas atmosphere, preserving heat for 25 hours under pure H2 atmosphere, and reducing the temperature under N2 atmosphere;
step nine: and (3) carrying out stretching, leveling and annealing after the insulating layer is coated, wherein the elongation is 0.03-0.15%.
Preferably, in the third step: the heating temperature follows the following relationship:
T R ＝1100+(7.1[Mn][S]+0.51[Cu][S])×106，(T R : a heating temperature);
preferably, in the fifth step: the first stage normalized heating temperature follows the following relationship: t (T) C ＝T R －34.05ln(([Als]－1.93[N])×104)－56Tz[Mn][S]，(T C : first stage normalizing temperature).
Preferably, in the seventh step: the annealing temperature follows the following relationship: t (T) A ＝930000/T C ，(T A : decarburization annealing temperature).
Compared with the prior art, the invention has the following beneficial effects:
in the production of high magnetic induction oriented silicon steel, the processes of the processes are mutually influenced, and the invention has the advantages that the post-process is formulated according to the pre-process, and the primary recrystallized grains of decarburization annealing tend to be uniform through the repeated grain recrystallization control of the processes of hot rolling, normalizing, annealing and the like, so that the good magnetic property is finally obtained.
Drawings
FIG. 1 is a diagram of primary recrystallized grains of a method for producing low-temperature high-magnetic induction oriented silicon steel based on grain homogenization control according to the present invention;
FIG. 2 is a diagram of primary recrystallized grains of a comparative example of a method for producing low-temperature high-magnetic induction oriented silicon steel based on grain homogenization control in accordance with the present invention.
Detailed Description
The heating temperature is determined according to chemical components by combining the drawings, the normalizing temperature is determined by the heating temperature and the actual chemical components, the decarburization annealing temperature is determined by the normalizing temperature, meanwhile, the hot rolling and cold rolling processes are determined according to the grain homogenization principle, and the primary recrystallized grains are further homogenized by the process linkage design of the front and back working procedures, so that the orientation degree of the secondary recrystallization is improved, and the aim of improving the magnetic property of a finished product is fulfilled.
Example 1
A low-temperature high-magnetic induction oriented silicon steel production method based on grain homogenization control comprises the following steps: steelmaking, continuous casting, hot rolling, normalizing, cold rolling, decarburizing, nitriding, high-temperature annealing and stretching leveling, and the steps are as follows:
step one: the control range of the mass percentages of the smelting chemical components is as follows: c:0.05 to 0.07 percent; si:2.9 to 3.5 percent; mn:0.05 to 0.15 percent; p: less than or equal to 0.030%; s: 0.005-0.010%; als:0.02 to 0.035 percent; n: 0.0060-0.010%; sn:0.05 to 0.10 percent; cr: less than or equal to 0.30 percent; cu: less than or equal to 0.60 percent; the balance of Fe and unavoidable impurity elements;
step two: the continuous casting drawing speed is 0.95m/min, the thickness of a casting blank is 230mm, and the mass percentage of the chemical components of the casting blank is C:0.061%; si:3.27%; mn:0.08%; p:0.011%; s:0.008%; als: 0.024; n:0.0073%; sn:0.066%; cu:0.21% of Fe and unavoidable impurity elements as the rest;
step three: the slab obtained after continuous casting enters a heating furnace at 570 ℃ and is heated for 223min; the heating temperature is calculated according to the following formula, T R ＝1100+(7.1[Mn][S]+0.51[Cu][S])×106＝1154℃；
Step four: after the slab is heated, rolling the slab into a steel strip with the specification of 2.3mm by a continuous rolling mill, wherein the rough rolling pass adopts a large reduction rate, the recrystallization of crystal grains is promoted, the deformation rate of the rough rolling pass is controlled to be 40-50%, the reduction rate of the finish rolling pass is sequentially reduced from 50% to 20%, and the finish rolling temperature T is the final rolling temperature Z =946 ℃, coiling temperature is 550 ℃;
step five: the hot rolled steel strip is subjected to two-stage normalization, wherein the first stage normalization temperature is T calculated according to a formula C ＝T R －34.05ln(([Als]－1.93[N])×104)－56Tz[Mn][S]The second stage normalizing temperature is 900 ℃, the total furnace time is 4.5min, water cooling is adopted after furnace discharging, and the cooling speed is 40 ℃/s;
step six: after normalizing, rolling the steel strip by a twenty-high cold rolling mill, and performing primary cold rolling to obtain a finished product with the thickness of 0.27mm, wherein the total rolling reduction is controlled to 88.3%, 5-pass rolling is adopted, the rolling reduction is sequentially 40%, 39.1%, 36.8%, 33.9% and 23.1%, 2 nd-pass and 3 rd-pass rolling are performed by aging, the aging temperature of the 2 nd-pass is 171 ℃, and the aging temperature of the 3 rd-pass is 218 ℃;
step seven: the cold rolled steel strip is decarburized and nitrided in an annealing process, and coiled into a steel coil after being coated with magnesium oxide, wherein the temperature rising speed of the steel strip in a furnace is controlled at 27 ℃/s, and the decarburization annealing temperature is determined according to the normalizing temperature to obtain T A ＝930000/T C The nitriding is performed at 830 ℃ by two-stage nitriding, wherein the first-stage nitriding temperature is 850 ℃, the second-stage nitriding temperature is 800 ℃, and the nitriding is performed after the nitriding [ N]=205 ppm, total oven time 3min;
step eight: heating to 700 ℃ at full speed under N2 atmosphere, preserving heat for 20 hours under nitrogen-hydrogen mixed gas atmosphere with the volume fraction of hydrogen being 40%, heating to 1200 ℃ at the heating rate of 18 ℃/h under ammonia decomposition gas atmosphere, preserving heat for 25 hours under pure hydrogen atmosphere, and reducing temperature under nitrogen atmosphere;
step nine: and (3) carrying out stretching leveling annealing after the insulating layer is coated, wherein the elongation is 0.07%.
Sampling for square ring test, P 1.7 The following ratio=1.08W/kg is 63.3%; b (B) 800 The ratio of =1.90T or more is 69.5%.
Example 2
The low-temperature high-magnetic induction oriented silicon steel production method based on grain homogenization control comprises the following production steps:
step one: the control range of the mass percentages of the smelting chemical components is as follows: c:0.05 to 0.07 percent; si:2.9 to 3.5 percent; mn:0.05 to 0.15 percent; p: less than or equal to 0.030%; s: 0.005-0.010%; als:0.02 to 0.035 percent; n: 0.0060-0.010%; sn:0.05 to 0.10 percent; cr: less than or equal to 0.30 percent; cu: less than or equal to 0.60 percent; the balance of Fe and unavoidable impurity elements;
step two: the continuous casting drawing speed is 0.95m/min, the thickness of a casting blank is 230mm, and the mass percentage of the chemical components of the casting blank is C: 0.051; si:3.25%; mn:0.10%; p:0.013%; s:0.006%; als:0.027%; n:0.0068%; sn:0.069%; cu:0.02% of Fe and unavoidable impurity elements as the rest;
step three: the slab obtained after continuous casting enters a heating furnace at 570 ℃ for 235min; the heating temperature is calculated according to the following formula, T R ＝1100+(7.1[Mn][S]+0.51[Cu][S])×106＝1143℃；
Step four: after the slab is heated, rolling the slab into a steel strip with the specification of 2.18mm by a continuous rolling mill, wherein the rough rolling pass adopts a large reduction rate, the recrystallization of crystal grains is promoted, the deformation rate of the rough rolling pass is controlled to be 40-50%, the reduction rate of the finish rolling pass is sequentially reduced from 50% to 20%, and the finish rolling temperature T is the final rolling temperature Z =941 ℃, coiling temperature is 550 ℃;
step five: the hot rolled steel strip is subjected to two-stage normalization, wherein the first stage normalization temperature is T calculated according to a formula C ＝T R －34.05ln(([Als]－1.93[N])×104)－56Tz[Mn][S]The second stage normalizing temperature is 900 ℃, the total furnace time is 4.5min, water cooling is adopted after furnace discharging, and the cooling speed is 45 ℃/s;
step six: after normalizing, rolling the steel strip by a twenty-high cold rolling mill, and performing primary cold rolling to obtain a finished product with the thickness of 0.27mm, wherein the total rolling reduction is controlled to be 87.6%, 5-pass rolling is adopted, the rolling reduction is sequentially 36.7%, 39.1%, 36.8%, 33.9% and 23.1%, 2 nd-pass and 3 rd-pass rolling are performed, the ageing temperature of the 2 nd-pass is 167 ℃, and the ageing temperature of the 3 rd-pass is 211 ℃;
step seven: the cold rolled steel strip is decarburized and nitrided in an annealing process, and coiled into a steel coil after being coated with magnesium oxide, wherein the temperature rising speed of the steel strip in a furnace is controlled at 27 ℃/s, and the decarburization annealing temperature is determined according to the normalizing temperature to obtain T A ＝930000/T C The nitriding is carried out by two-stage nitriding, wherein the first-stage nitriding temperature is 850 ℃, the second-stage nitriding temperature is 800 ℃, and the nitriding is carried out by [ N]=213 ppm, total oven time of 3min;
step eight: heating to 700 ℃ at full speed under N2 atmosphere, preserving heat for 20 hours under nitrogen-hydrogen mixed gas atmosphere with the volume fraction of hydrogen being 40%, heating to 1200 ℃ at the heating rate of 18 ℃/H under ammonia decomposition gas atmosphere, preserving heat for 25 hours under pure H2 atmosphere, and reducing the temperature under N2 atmosphere;
step nine: and (3) carrying out stretching leveling annealing after the insulating layer is coated, wherein the elongation is 0.07%.
Sampling for square ring test, P 1.7 The following ratio=1.08W/kg is 73.3%; b (B) 800 The ratio of =1.90T or more is 87.8%.
Example 3
The low-temperature high-magnetic induction oriented silicon steel production method based on grain homogenization control comprises the following production steps:
step one: the control range of the mass percentages of the smelting chemical components is as follows: c:0.05 to 0.07 percent; si:2.9 to 3.5 percent; mn:0.05 to 0.15 percent; p: less than or equal to 0.030%; s: 0.005-0.010%; als:0.02 to 0.035 percent; n: 0.0060-0.010%; sn:0.05 to 0.10 percent; cr: less than or equal to 0.30 percent; cu: less than or equal to 0.60 percent; the balance of Fe and unavoidable impurity elements;
step two: the continuous casting drawing speed is 0.95m/min, the thickness of a casting blank is 230mm, and the mass percentage of the chemical components of the casting blank is C:0.053%; si:3.25%; mn:0.13%; p: 0.016; s:0.007%; als:0.0308%; n:0.0095%; sn:0.061%; cu:0.02% of Fe and unavoidable impurity elements as the rest;
step three: the slab obtained after continuous casting enters a heating furnace at 570 ℃ for 226min; the heating temperature is calculated according to the following formula, T R ＝1100+(7.1[Mn][S]+0.51[Cu][S])×106＝1165℃；
Step four: after the slab is heated, rolling the slab into a steel strip with the specification of 2.46mm by a continuous rolling mill, wherein the rough rolling pass adopts a large reduction rate, the recrystallization of crystal grains is promoted, the deformation rate of the rough rolling pass is controlled to be 40-50%, the reduction rate of the finish rolling pass is sequentially reduced from 50% to 20%, and the finish rolling temperature T is the final rolling temperature Z =937 ℃, coiling temperature is 556 ℃;
step five: the hot rolled steel strip is subjected to two-stage normalization, wherein the first stage normalization temperature is T calculated according to a formula C ＝T R －34.05ln(([Als]－1.93[N])×104)－56Tz[Mn][S]=1109 ℃, second stage normalizing temperature 900 ℃, total oven time 4.5min. After discharging the furnace, adoptWater cooling, wherein the cooling speed is 45 ℃/s;
step six: rolling the steel strip by a twenty-high cold rolling mill after normalizing, and performing primary cold rolling to obtain the thickness of a finished product with the specification of 0.27mm, wherein the total rolling reduction is controlled to 89.02 percent, 5-pass rolling is adopted, the rolling reduction is sequentially 40.2 percent, 39.5 percent, 37.1 percent, 35.7 percent and 25 percent, 2 nd-pass and 3 rd-pass rolling are performed by aging, the 2 nd-pass aging temperature is 180 ℃, and the 3 rd-pass aging temperature is 212 ℃;
step seven: the cold rolled steel strip is decarburized and nitrided in an annealing process, and coiled into a steel coil after being coated with magnesium oxide, wherein the temperature rising speed of the steel strip in a furnace is controlled at 27 ℃/s, and the decarburization annealing temperature is determined according to the normalizing temperature to obtain T A ＝930000/T C The nitriding is carried out at 838 ℃ by adopting two-stage nitriding, wherein the nitriding temperature of the first stage is 850 ℃, the nitriding temperature of the second stage is 800 ℃, and the nitriding is carried out after the nitriding [ N]=190 ppm, total oven time 3min;
step eight: heating to 700 ℃ at full speed under N2 atmosphere, preserving heat for 20 hours under nitrogen-hydrogen mixed gas atmosphere with the volume fraction of hydrogen being 40%, heating to 1200 ℃ at the heating rate of 18 ℃/H under ammonia decomposition gas atmosphere, preserving heat for 25 hours under pure H2 atmosphere, and reducing the temperature under N2 atmosphere;
step nine: and (3) carrying out stretching leveling annealing after the insulating layer is coated, wherein the elongation is 0.07%.
Sampling for square ring test, P 1.7 The following ratio=1.08W/kg is 69.2%; b (B) 800 The ratio of =1.90T to 72.6%
Comparative example
The process flow of the comparative example is: smelting, continuous casting, heating, hot rolling, normalizing, cold rolling, decarburizing, nitriding, high-temperature annealing and stretching and leveling. Wherein the smelting, continuous casting, hot rolling, cold rolling, nitriding, high-temperature annealing, leveling stretching and other processes are the same as those of the embodiment, and the conventional processes of heating, normalizing and decarburizing are adopted, namely, the heating temperature is 1160 ℃, the normalizing temperature of the first stage in the normalizing process is 1100 ℃, and the denitrification annealing temperature is 830 ℃.
Sampling for square ring test, wherein the proportion of P1.7=1.08W/kg is 45.6%; b800 The ratio of =1.90T above is 38.3%.
To sum up: in the production of high magnetic induction oriented silicon steel, the processes of all the processes are mutually influenced, and the invention has the advantages that the post-process is formulated according to the pre-process, and the primary recrystallized grains of decarburization annealing tend to be uniform through the repeated grain recrystallization control of the procedures of hot rolling, normalizing, annealing and the like, so that the good magnetic property is finally obtained
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. The low-temperature high-magnetic induction oriented silicon steel production method based on grain homogenization control is characterized in that primary recrystallized grains are homogenized through linkage design of technological parameters of each procedure, and the method comprises the following steps:
step one: the mass percent control range of the chemical components is as follows: c:0.05 to 0.07 percent; si:2.9 to 3.5 percent; mn:0.05 to 0.15 percent; p: less than or equal to 0.030%; s: 0.005-0.010%; als:0.02 to 0.035 percent; n: 0.0060-0.010%; sn:0.05 to 0.10 percent; cr: less than or equal to 0.30 percent; cu: less than or equal to 0.60 percent; the balance of Fe and unavoidable impurity elements;
step two: the continuous casting adopts a high-pulling-speed forced cooling process and electromagnetic stirring, so that the proportion of coarse columnar crystals is reduced, the proportion of equiaxial crystals is controlled to be 30-50%, and the thickness of a casting blank is 200-250 mm;
step three: the slab obtained after continuous casting enters a heating furnace at the temperature of more than 500 ℃ and is heated for 200-300 min;
step four: rolling the heated plate blank into a steel belt with the specification of 2.1-2.5 mm by a continuous rolling mill, wherein the rough rolling pass adopts a large rolling reduction rate, the recrystallization of crystal grains is promoted, the deformation rate of the rough rolling pass is controlled to be 40-50%, the rolling reduction rate of the finish rolling pass is sequentially reduced from 50% to 20%, and the final rolling temperature is 900-1000 ℃;
step five: carrying out two-stage normalizing on the hot rolled steel strip, wherein the first-stage normalizing temperature is determined according to the chemical components of the steel strip, the second-stage normalizing temperature is 900 ℃, the total furnace time is 4.5min, and water cooling is adopted after the steel strip is discharged, and the cooling speed is 40 ℃/s;
step six: after normalizing, rolling the steel strip by a twenty-high cold rolling mill, and performing primary cold rolling to obtain a finished product with the thickness of 0.27mm, wherein the total rolling reduction is 87-90%, the pass rolling reduction is controlled from large to small in sequence, and the ageing rolling temperature is controlled at 150-250 ℃;
step seven: the cold rolled steel strip is subjected to decarburization and nitriding in an annealing process, and coiled into a steel coil after being coated with magnesium oxide, wherein the temperature rising speed of the steel strip in a furnace is controlled to be 20-50 ℃/s, the decarburization annealing temperature is determined according to the normalizing temperature, the nitriding adopts two-stage nitriding, the nitriding temperature of the first stage is 850 ℃, the nitriding temperature of the second stage is 800 ℃, and the total furnace time is 3min;
step eight: heating to 700 ℃ at full speed under N2 atmosphere, preserving heat for 20 hours under nitrogen-hydrogen mixed gas atmosphere with the volume fraction of hydrogen being 40%, heating to 1200 ℃ at the heating rate of 18 ℃/H under ammonia decomposition gas atmosphere, preserving heat for 25 hours under pure H2 atmosphere, and reducing the temperature under N2 atmosphere;
step nine: and (3) carrying out stretching, leveling and annealing after the insulating layer is coated, wherein the elongation is 0.03-0.15%.
2. The method for producing low-temperature high-magnetic induction oriented silicon steel based on grain homogenization control of claim 1, which is characterized by comprising the following steps: in the third step: the heating temperature follows the following relationship: t (T) R ＝1100+(7.1[Mn][S]+0.51[Cu][S])×106。
3. The method for producing low-temperature high-magnetic induction oriented silicon steel based on grain homogenization control of claim 1, which is characterized by comprising the following steps: in the fifth step: the first stage normalized heating temperature follows the following relationship: t (T) C ＝T R －34.05ln(([Als]－1.93[N])×104)－56Tz[Mn][S]。
4. The method for producing low-temperature high-magnetic induction oriented silicon steel based on grain homogenization control of claim 1, which is characterized by comprising the following steps: in the seventh step: the annealing temperature follows the following relationship: t (T) A ＝930000/T C 。
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| CN117702006A (en) * | 2024-02-06 | 2024-03-15 | 包头威丰新材料有限公司 | Rare earth high-magnetic-induction oriented silicon steel and preparation method and application thereof |
| CN117702006B (en) * | 2024-02-06 | 2024-04-30 | 包头威丰新材料有限公司 | Rare earth high-magnetic-induction oriented silicon steel and preparation method and application thereof |
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| CN117702006A (en) * | 2024-02-06 | 2024-03-15 | 包头威丰新材料有限公司 | Rare earth high-magnetic-induction oriented silicon steel and preparation method and application thereof |
| CN117702006B (en) * | 2024-02-06 | 2024-04-30 | 包头威丰新材料有限公司 | Rare earth high-magnetic-induction oriented silicon steel and preparation method and application thereof |
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