CN111926171B - Continuous annealing cooling control method for cold-rolled non-oriented silicon steel strip - Google Patents
Continuous annealing cooling control method for cold-rolled non-oriented silicon steel strip Download PDFInfo
- Publication number
- CN111926171B CN111926171B CN202010899697.6A CN202010899697A CN111926171B CN 111926171 B CN111926171 B CN 111926171B CN 202010899697 A CN202010899697 A CN 202010899697A CN 111926171 B CN111926171 B CN 111926171B
- Authority
- CN
- China
- Prior art keywords
- cooling
- steel strip
- temperature
- air duct
- furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
-
- 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
-
- 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
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
Abstract
The invention discloses a continuous annealing cooling control method for a non-oriented silicon steel strip, which is characterized in that a steel strip is cooled from an annealing cooling initial temperature to a process set temperature by adopting subsection cooling control under the protection of a reducing atmosphere; the temperature is divided into five cooling sections from high to low along the running direction of the steel strip, namely a high-temperature slow cooling section, a medium-temperature controlled cooling section, a medium-low temperature fast cooling section, an air blowing cooling section outside the furnace, and a water immersion and water spraying cooling section. The equipment of the cooling section of the annealing furnace of the high-speed continuous annealing unit is improved, the process is optimized, the practical problems of transverse magnetic difference and poor plate surface quality of a high-grade non-oriented silicon steel strip subjected to continuous annealing are solved, the ideal cooling effect of the high-grade non-oriented silicon steel strip subjected to high-speed annealing is realized, the non-oriented high-grade isotropic qualification rate can be greatly improved, the plate shape and the flatness of a finished product subjected to annealing are effectively improved, the edge wave height wavelength is reduced, the degree of urgency is reduced, and the practical effect is brought to the improvement of the product quality.
Description
Technical Field
The invention belongs to the technical field of non-oriented silicon steel production, and particularly relates to a continuous annealing and cooling control method for a cold-rolled non-oriented silicon steel strip.
Background
In recent years, aiming at the new increasing requirements of steel for high-efficiency motors and steel for new energy automobile driving motors, electrical steel production enterprises strive for developing high-magnetic-induction thin-specification series marks; aiming at the special requirements of steel for the iron core of the large-scale hydraulic generator, a non-oriented high-end product with an environmental protection coating is developed; the high-grade non-oriented silicon steel is trial-produced by adopting a short process, and a new manufacturing process is expanded so as to reduce the production and manufacturing cost.
The demand for reducing the loss of the generator and the motor is increasingly strengthened. The non-oriented silicon steel sheet is used as an iron core material of a generator and a motor, plays a key role in reducing the energy consumption of the motor, and particularly for an ultra-large motor, the weight ratio of the silicon steel sheet used for the iron core is large, the motor efficiency is high, and the loss of the iron core is reduced, so that the loss of the whole motor can be greatly reduced. At present or in the future, the development direction of non-oriented silicon steel is to produce more products with high grade, thin specification and environment-friendly coating.
The most important requirements of the non-oriented silicon steel are as follows: the steel has low iron loss, high magnetic induction, high strength and small performance fluctuation; secondly, the plate shape has good quality, high thickness precision and small same plate difference. The application range is from a low-power unmanned aerial vehicle to a high-power traction motor, and high-grade non-oriented silicon steel is used. The applied frequency is from 10Hz to 10 kHz. For example, wind power works in a low-frequency region of 10Hz, a compressor works in a range of 50-150 Hz, the working frequency of a driving motor of the new energy automobile is within 1kHz, and a micro vibration motor works above 2 kHz. The thickness of the electrical steel is from 0.05mm to 1.0 mm. For example, the driving motor of the new energy automobile is gradually high-frequency, the plate thickness is from 0.50mm to 0.35mm, and is from 0.35mm to 0.30mm, 0.27mm and 0.25mm, and the thinner is 0.20 mm; in the unmanned aerial vehicle field, some thickness use 0.05 mm. In summary, the trend for high grade non-oriented silicon steel thickness is to be thinner and thinner.
In order to obtain excellent magnetic performance and good surface and plate shape, high-grade non-oriented silicon steel needs to be subjected to high-temperature recrystallization annealing in a continuous annealing unit under the protection of high hydrogen atmosphere to finish the edge coating. The annealing temperature range of the finished product is 950-1100 ℃, and the annealing time is 20-120 s. The high-grade non-oriented silicon steel has high Si and Al contents and has strict requirements on the annealing process of finished products. If the annealing temperature is lower than 950 ℃, the crystal grains of the finished product are difficult to grow, the hysteresis loss in the iron loss under power frequency is higher, and the iron loss of the finished product is finally worsened; when the annealing temperature is higher than 1050 ℃ or higher, if the annealing time is not controlled well, the grain size in the steel strip is too large, the brittleness of the steel plate is increased, the mechanical property is changed, and the corresponding surface quality problem and the related equipment load are increased. The annealing time can be adjusted appropriately with temperature change in order to obtain desired magnetic and mechanical properties.
The high-grade non-oriented silicon steel thin strip is mainly used for manufacturing iron cores of motors with various specifications and sizes, the motors work under the running state, the iron cores are composed of stators and rotors which are formed by stacking toothed circular punching sheets, and the silicon steel plates are required to be in magnetic isotropy, so that the iron cores manufactured by the non-oriented silicon steel generally require that the longitudinal and transverse iron loss difference is less than 8 percent, the magnetic induction difference is less than 10 percent, and the longitudinal and transverse iron loss difference and the magnetic induction difference are smaller for large motors. According to practical experience of production for many years, the non-oriented silicon steel mainly has transverse magnetism which cannot catch up with longitudinal magnetism, and the root of the non-oriented silicon steel is explored through process adjustment for many years or the annealing cooling link is not controlled to be better.
The high-grade non-oriented silicon steel thin strip is mainly used for manufacturing iron cores of motors with various specifications and sizes, the surface of the silicon steel plate is required to be smooth, flat and uniform in thickness, the smoothness and the flatness of the surface of the silicon steel plate are mainly influencing factors of a lamination coefficient, the lamination coefficient is important data for measuring the relevant quality of the silicon steel plate, and the high and low reaction of the lamination coefficient finally results in the iron loss and the magnetic induction of the iron core. The uneven surface or uneven thickness of the steel belt can not ensure the dimensional accuracy of the punched sheet, and great difficulty is caused to the work of assembling the iron core, so that the pressure stress is generated in the iron core, the direct consequence is that the magnetism and the noise are reduced and increased, the damage of the steel belt joint edge coating film is easily caused, and the high-speed punch press can be blocked when the punched sheet is punched.
Disclosure of Invention
The invention aims to provide a continuous annealing cooling control method for a cold-rolled non-oriented silicon steel strip aiming at the defects of the prior art, solves the practical problems of transverse magnetic difference and poor plate surface quality of a high-grade non-oriented silicon steel strip after continuous annealing, and realizes the ideal cooling effect of the high-grade non-oriented silicon steel strip in high-speed annealing.
In order to achieve the aim, the continuous annealing cooling control method for the non-oriented silicon steel strip, which is designed by the invention, adopts subsection cooling control to cool the steel strip from the annealing cooling initial temperature to the process set temperature under the protection of reducing atmosphere; the temperature is divided into five cooling sections from high to low along the running direction of the steel strip, and the five cooling sections are as follows: the steel strip temperature of the outlet side of the high-temperature slow cooling section is 800-900 ℃, the steel strip temperature of the outlet side of the medium-temperature controlled cooling section is 550-650 ℃, the steel strip temperature of the outlet side of the medium-temperature controlled cooling section is less than or equal to 120-180 ℃, the steel strip temperature of the outlet side of the external air injection cooling section is less than or equal to 70-110 ℃, and the steel strip temperature of the outlet side of the water injection and water injection cooling section is less than or equal to 20-50 ℃.
Further, the cooling process of the high-temperature slow cooling section is as follows: and slowly cooling the steel strip from the annealing cooling initial temperature to 800-900 ℃ at the maximum process speed and the cooling rate of 9-10 ℃/s of the unit, and protecting the steel strip by using a reducing atmosphere of 75% of H2+ 25% of N2 in percentage by weight.
Furthermore, the slow cooling adopts high-temperature-resistant sleeves which are transversely staggered for indirect cooling, and the slow reduction of the furnace temperature is realized by adopting a mode that a fan pumps the heat to carry away by the indirect cooling during the indirect cooling; each heat-resisting alloy radiation sleeve is formed by splicing a plurality of sections of sleeve units, and each section of sleeve unit controls the suction air quantity by using a fan independently; and a hydrogen detector is arranged on a pipeline at the inlet side of each fan, and resistance bands are arranged on furnace walls and the furnace bottom at two sides of the front sections of the sleeve pipe units in the high-temperature slow cooling section for heating.
Further, the cooling process of the medium-temperature controlled cooling section is as follows: and slowly cooling the steel strip from 800-900 ℃ to 550-650 ℃ at the maximum process speed and cooling rate of 15-20 ℃/s of the unit, and protecting the steel strip by using a reducing atmosphere of 0-30 wt% of H2+ 100-70 wt% of N2.
Furthermore, the slow cooling adopts a plurality of groups of closed circulating cooling devices consisting of a closed circulating fan and a water-cooled heat exchanger, an air duct assembly of each closed circulating fan is divided into an upper air duct and a lower air duct, four partition plates are uniformly distributed in the upper air duct and the lower air duct in a direction perpendicular to the steel strip direction to divide the air duct into five partition areas, and each partition area is provided with an adjusting baffle with scales; the reducing atmosphere is pumped out from the two sides in the furnace section through a closed circulating fan, the reducing atmosphere is reduced to 400-600 ℃ through a water-cooling heat exchanger, the reducing atmosphere is sprayed and cooled by aligning an upper air duct and a lower air duct which are respectively positioned above and below the steel strip to the hot steel strip, and the ventilation of each cell area is adjusted through manually adjusting an adjusting baffle plate so as to control the temperature change of the upper, the lower and the transverse direction of the steel strip, so that the steel strip is uniformly cooled.
Further, the temperature of cooling water entering and exiting the cold-heat exchanger is controlled to be 7-8 ℃, and the temperature of reducing atmosphere is controlled to be 600-400 ℃ through the outlets of an upper air duct and a lower air duct of the closed circulating cooling device; the width of the five cell areas of each air duct is wide at two sides and narrow in the middle; the outlet of the medium temperature controlled cooling section is provided with a transverse plate temperature scanning and measuring instrument to control the transverse plate temperature to be less than or equal to 5 ℃; and a reducing atmosphere isolating device is also arranged at the outlet of the medium temperature controlled cooling section.
Further, the cooling process of the medium-low temperature fast cooling section comprises the following steps: and rapidly cooling the steel strip from 550-600 ℃ to 120-180 ℃ at the maximum process and cooling rate of 35-40 ℃/s of the unit, and protecting the steel strip by using 100% N2 reducing atmosphere.
Furthermore, the rapid cooling adopts a closed circulating cooling device consisting of a closed circulating fan and a water-cooling heat exchanger, and an air duct assembly of each closed circulating fan is divided into an upper air duct and a lower air duct; the reducing atmosphere is pumped out from the two sides in the furnace of the section through a closed circulating fan, is rapidly cooled through a water-cooling heat exchanger, and is sprayed and cooled to the hot steel strip through an upper air duct and a lower air duct which are respectively positioned above and below the steel strip; the temperature of the cooling water entering and exiting the cold-heat exchanger is controlled to be 9-10 ℃.
Further, the cooling process of the air blowing cooling section outside the furnace is as follows: the temperature of the steel strip after being discharged is 120-180 ℃, and the steel strip is further cooled by an external fan to be cooled from 120-180 ℃ to 70-110 ℃.
Further, the water immersion and water spray cooling section cooling process is as follows: the temperature of the steel strip outside the furnace after the air injection cooling section is 70-110 ℃, and the temperature of the steel strip is reduced to 20-50 ℃ by utilizing the online desalted water immersion tank and the spray tank.
Compared with the prior art, the invention has the following advantages: the continuous annealing cooling control method for the high-grade non-oriented silicon steel strip solves the practical problems of transverse magnetic difference and poor plate surface quality of the high-grade non-oriented silicon steel strip after continuous annealing by improving equipment and optimizing the process in the cooling section of the annealing furnace of the high-speed continuous annealing unit, realizes the ideal cooling effect of the high-grade non-oriented silicon steel strip in high-speed annealing, can greatly improve the non-oriented high-grade isotropic qualification rate, effectively improve the plate shape and the flatness of a finished product after annealing, reduce the edge wave height wavelength, reduce the severity and bring a practical effect for improving the product quality.
Drawings
FIG. 1 is a schematic sectional view of a high-temperature slow-cooling furnace section;
FIG. 2 is a sectional view of the medium temperature controlled cooling furnace section.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
The high-grade non-oriented silicon steel thin strip (the non-oriented silicon steel with the silicon content of 1.8-3.5 percent of the high-grade non-oriented silicon steel, the thin specification is that the thickness of a finished product is 0.35mm and below) is cooled from 950 ℃ -1100 ℃ (namely the annealing cooling initial temperature), and the steel strip is cooled from the annealing temperature to the temperature specified by the process by adopting a sectional cooling control mode under the protection of a reducing atmosphere. Each section adopts different cooling equipment, is adjusted and controlled according to a set cooling speed, and is divided into five cooling sections from high temperature to low temperature along the running direction of the steel strip: a high-temperature slow cooling section (the temperature of the steel strip at the outlet side is 800-900 ℃), a medium-temperature controlled cooling section (the temperature of the steel strip at the outlet side is 550-650 ℃), a medium-low temperature fast cooling section (the temperature of the steel strip at the outlet side is less than or equal to 120-180 ℃), an air blowing cooling section outside the furnace (the temperature of the steel strip at the outlet side is less than or equal to 70-110 ℃), and a water soaking and water spraying cooling section (the temperature of the steel strip at the outlet side is less than or equal to 20-50 ℃).
The specific cooling process of the five cooling sections is as follows:
1) the cooling process of the high-temperature slow cooling section is that the length of a furnace of the high-temperature slow cooling section is determined by calculation according to the maximum process speed (for example, 180m/min) of a machine set and the cooling rate of 9-10 ℃/s, the steel strip 1 is slowly cooled to 800-900 ℃ from 950-1100 ℃, and is protected by reducing atmosphere of 75% of H2+ 25% of N2 by weight percentage;
as shown in fig. 1, the slow cooling adopts the high temperature resistant sleeves 2 which are transversely staggered for indirect cooling, and the slow furnace temperature reduction is realized by adopting a mode of pumping heat to take away heat by a fan during the indirect cooling; meanwhile, in order to keep the cooling rate of the section consistent, each heat-resistant alloy radiation sleeve is formed by splicing a plurality of sections of sleeve units, and each section of sleeve unit is independently controlled by a fan to suck air volume; in order to prevent safety accidents caused by leakage of the heat-resistant alloy radiation sleeve, a hydrogen detector is arranged on a pipeline on the inlet side of each fan, and once the hydrogen leakage is detected, the fans are protected to automatically stop through a safety chain; in order to avoid the phenomenon that the thin strip is cooled too fast in the section, the furnace walls 4 and the furnace bottom of the two sides of the first sections of the sleeve units in the section are provided with resistance strips 3 for heating and warming, so that the auxiliary control cooling speed is brought, and the cooling speed of the section is ensured to meet the process requirement.
2) The cooling process of the medium-temperature controlled cooling section is that the length of a furnace of the medium-temperature controlled cooling section is calculated and determined according to the maximum process speed and the cooling rate of a machine set of 15-20 ℃/s, the steel strip is slowly cooled to 550-650 ℃ from 800-900 ℃, and is protected by reducing atmosphere of 0-30% of H2+ 100-70% of N2 in percentage by weight;
as shown in fig. 2, slow cooling is performed by using a plurality of groups of closed circulating cooling devices composed of a closed circulating fan 5 and a water-cooled heat exchanger 6, the reducing atmosphere is cooled circularly, an air duct assembly of each closed circulating fan 5 is divided into an upper air duct 7 and a lower air duct 8, four partition plates 9 are uniformly arranged in the upper air duct and the lower air duct in a direction perpendicular to the steel strip to divide the air duct into five partition areas 10, and each partition area is provided with an adjusting baffle with scales; the reducing atmosphere is pumped out from the two sides in the furnace section through a closed circulating fan, the reducing atmosphere is reduced to 400-600 ℃ through a water-cooled heat exchanger, the reducing atmosphere is sprayed and cooled by aligning an upper air duct and a lower air duct which are respectively positioned above and below the steel strip to the hot steel strip, and the ventilation of each cell area (mainly detecting the pressure of each separated gas) is adjusted through manually adjusting an adjusting baffle plate in each cell area so as to control the temperature change of the upper, the lower and the transverse direction of the steel strip and ensure that the steel strip is uniformly cooled;
in this embodiment: a) fourteen groups of closed circulating cooling devices are adopted, according to the width, thickness and speed of the steel strip, the frequency conversion speed regulation of each closed circulating fan controls the circulating air quantity, and the cooling air quantity of the closed circulating fans is increased in a gradient manner along the running direction of the steel strip to realize slow and uniform cooling; b) the water-cooled heat exchanger adopts a tube cooling type of SUS304 without fins, the cooling water quantity of each heat exchanger is adjustable, the temperature of the cooling water entering and exiting the cold-heated heat exchanger is controlled to be 7-8 ℃, and the temperature of the reducing atmosphere is controlled to be 600-400 ℃ at the outlets of an upper air duct and a lower air duct of the closed circulating cooling device; in addition, the width of the five cell areas of each air duct is wide at two sides and narrow in the middle; c) a transverse plate temperature scanning and measuring instrument is arranged at an outlet of the medium temperature controlled cooling section, so that the transverse plate temperature of the steel strip can be measured in time and controlled to be less than or equal to 5 ℃, and the condition of uniform transverse cooling of the steel strip can be accurately judged; d) a reducing atmosphere isolating device is also arranged at the outlet of the section, so that the furnace pressure can be effectively controlled, and dangerous H is prevented2And the furnace enters a low-temperature area to ensure the safety of the furnace.
3) The cooling process of the medium-low temperature quick cooling section comprises the following steps: calculating and determining the length of a medium-low temperature fast cooling section furnace according to the maximum process and the cooling rate of a unit of 35-40 ℃/s, rapidly cooling the steel strip from 550-600 ℃ to 120-180 ℃, and protecting the steel strip by using 100% N2 reducing atmosphere;
the rapid cooling adopts a closed circulating cooling device consisting of closed circulating fans and a water-cooled heat exchanger to circularly cool the reducing atmosphere, and an air channel assembly of each closed circulating fan is divided into an upper air channel and a lower air channel; the reducing atmosphere is pumped out from the two sides in the furnace of the section through a closed circulating fan, is rapidly cooled through a water-cooling heat exchanger, and is sprayed and cooled to the hot steel strip through an upper air duct and a lower air duct which are respectively positioned above and below the steel strip;
in this embodiment, in order to improve the cooling effect, the closed circulation cooling device is provided with two water-cooled heat exchangers, each water-cooled heat exchanger adopts a tube cooling method of SUS304 with fins, the cooling water amount of each water-cooled heat exchanger is adjustable, and the temperature of the cooling water entering and exiting the heat exchanger is controlled to be 9 ℃ to 10 ℃, so as to realize the effect of rapid cooling.
4) The cooling process of the air blowing cooling section outside the furnace comprises the following steps that the temperature of the steel strip after being discharged is 120-180 ℃, an outer fan outside the furnace is used for further cooling the steel strip, and the steel strip is cooled to 70-110 ℃ from 120-180 ℃;
5) the cooling process of the water soaking and water spraying cooling section is that the temperature of the steel strip outside the furnace after the air spraying cooling section is 70-110 ℃, and the temperature of the steel strip is reduced to 20-50 ℃ by utilizing the online desalted water soaking tank and the spraying tank.
Claims (5)
1. A continuous annealing cooling control method for a non-oriented silicon steel strip is characterized by comprising the following steps: cooling the steel strip from the annealing cooling initial temperature to the process set temperature by adopting subsection cooling control under the protection of reducing atmosphere; the temperature is divided into five cooling sections from high to low along the running direction of the steel strip, and the five cooling sections are as follows: a high-temperature slow cooling section, a medium-temperature controlled cooling section, a medium-low temperature fast cooling section, an air blowing cooling section outside the furnace, and a water soaking and water spraying cooling section;
the cooling process of the high-temperature slow cooling section comprises the following steps: according to maximum process speed of unitAnd slowly cooling the steel strip from the annealing cooling initial temperature to 800-900 ℃ at the cooling rate of 9-10 ℃/s, and using 75% of H by weight2+25％N2The reducing atmosphere is protected;
the cooling process of the medium-temperature controlled cooling section comprises the following steps: slowly cooling the steel strip from 800-900 ℃ to 550-650 ℃ at the maximum process speed and cooling rate of 15-20 ℃/s of the unit, and adding 0-30% H by weight2+100～70％N2The reducing atmosphere is protected;
the cooling process of the medium-low temperature quick cooling section comprises the following steps: rapidly cooling the steel strip from 550-600 ℃ to 120-180 ℃ at the maximum process and cooling rate of 35-40 ℃/s of the unit, and adding 100% N2Protecting in a reducing atmosphere;
the cooling process of the air blowing cooling section outside the furnace comprises the following steps: the temperature of the steel strip after being taken out of the furnace is 120-180 ℃, an external fan is utilized to further cool the steel strip, and the steel strip is cooled to 70-110 ℃ from 120-180 ℃;
the cooling process of the water immersion and water spray cooling section comprises the following steps: the temperature of the steel strip outside the furnace after the air injection cooling section is 70-110 ℃, and the temperature of the steel strip is reduced to 20-50 ℃ by utilizing the online desalted water immersion tank and the spray tank.
2. The continuous annealing cooling control method for the non-oriented silicon steel strip as set forth in claim 1, characterized in that: the slow cooling adopts high-temperature-resistant sleeves which are transversely staggered for indirect cooling, and the slow reduction of the furnace temperature is realized by adopting a mode that a fan pumps the heat for indirect cooling to take away the heat during the indirect cooling; each heat-resisting alloy radiation sleeve is formed by splicing a plurality of sections of sleeve units, and each section of sleeve unit controls the suction air quantity by using a fan independently; and a hydrogen detector is arranged on a pipeline at the inlet side of each fan, and resistance bands are arranged on furnace walls and the furnace bottom at two sides of the front sections of the sleeve pipe units in the high-temperature slow cooling section for heating.
3. The continuous annealing cooling control method for the non-oriented silicon steel strip as set forth in claim 1, characterized in that: the slow cooling adopts a plurality of groups of closed circulating cooling devices consisting of a closed circulating fan and a water-cooled heat exchanger, an air duct assembly of each closed circulating fan is divided into an upper air duct and a lower air duct, four partition plates are uniformly distributed in the upper air duct and the lower air duct in a direction perpendicular to the steel strip direction to divide the air duct into five cell areas, and each cell area is provided with an adjusting baffle with scales; the reducing atmosphere is pumped out from the two sides in the furnace section through a closed circulating fan, the reducing atmosphere is reduced to 400-600 ℃ through a water-cooling heat exchanger, the reducing atmosphere is sprayed and cooled by aligning an upper air duct and a lower air duct which are respectively positioned above and below the steel strip to the hot steel strip, and the ventilation of each cell area is adjusted through manually adjusting an adjusting baffle plate so as to control the temperature change of the upper, the lower and the transverse direction of the steel strip, so that the steel strip is uniformly cooled.
4. The continuous annealing cooling control method for the non-oriented silicon steel strip as set forth in claim 3, characterized in that: controlling the temperature of cooling water entering and exiting the cold-heat exchanger to be 7-8 ℃, and controlling the temperature of reducing atmosphere at 600-400 ℃ at the outlets of an upper air duct and a lower air duct of the closed circulating cooling device; the width of the five cell areas of each air duct is wide at two sides and narrow in the middle; the outlet of the medium temperature controlled cooling section is provided with a transverse plate temperature scanning and measuring instrument to control the transverse plate temperature to be less than or equal to 5 ℃; and a reducing atmosphere isolating device is also arranged at the outlet of the medium temperature controlled cooling section.
5. The continuous annealing cooling control method for the non-oriented silicon steel strip as set forth in claim 1, characterized in that: the rapid cooling adopts a closed circulating cooling device consisting of closed circulating fans and a water-cooling heat exchanger, and an air channel assembly of each closed circulating fan is divided into an upper air channel and a lower air channel; the reducing atmosphere is pumped out from the two sides in the furnace of the section through a closed circulating fan, is rapidly cooled through a water-cooling heat exchanger, and is sprayed and cooled to the hot steel strip through an upper air duct and a lower air duct which are respectively positioned above and below the steel strip; the temperature of the cooling water entering and exiting the cold-heat exchanger is controlled to be 9-10 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010899697.6A CN111926171B (en) | 2020-08-31 | 2020-08-31 | Continuous annealing cooling control method for cold-rolled non-oriented silicon steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010899697.6A CN111926171B (en) | 2020-08-31 | 2020-08-31 | Continuous annealing cooling control method for cold-rolled non-oriented silicon steel strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111926171A CN111926171A (en) | 2020-11-13 |
| CN111926171B true CN111926171B (en) | 2022-04-29 |
Family
ID=73310038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010899697.6A Active CN111926171B (en) | 2020-08-31 | 2020-08-31 | Continuous annealing cooling control method for cold-rolled non-oriented silicon steel strip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111926171B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5681627A (en) * | 1979-12-05 | 1981-07-03 | Kawasaki Steel Corp | Production of directional silicon steel plate of superior repetitive bending characteristic |
| CN102041367A (en) * | 2009-10-23 | 2011-05-04 | 宝山钢铁股份有限公司 | Manufacturing method of thin strip continuously cast and cold rolled non-oriented electrical steel |
| CN202007263U (en) * | 2011-03-30 | 2011-10-12 | 广东顺德浦项钢板有限公司 | Silicon steel annealing furnace |
| CN102453838A (en) * | 2010-10-25 | 2012-05-16 | 宝山钢铁股份有限公司 | High-strength non-oriented electrical steel with high magnetic induction and manufacturing method thereof |
| CN103451399A (en) * | 2013-08-29 | 2013-12-18 | 河北钢铁股份有限公司唐山分公司 | Annealing process for producing cold rolling non-oriented electrical steel |
| CN104762450A (en) * | 2015-03-13 | 2015-07-08 | 内蒙古包钢钢联股份有限公司 | Annealing process of producing SPCC continuous-annealing board with silicon steel annealing furnace |
| WO2015180501A1 (en) * | 2014-05-30 | 2015-12-03 | 宝山钢铁股份有限公司 | Reducing gas circulation recycling system for pickling-free continuous annealing furnace and utilisation method therefor |
| CN107587039A (en) * | 2017-08-30 | 2018-01-16 | 武汉钢铁有限公司 | The driving motor for electric automobile non-orientation silicon steel and production method of excellent magnetic |
-
2020
- 2020-08-31 CN CN202010899697.6A patent/CN111926171B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5681627A (en) * | 1979-12-05 | 1981-07-03 | Kawasaki Steel Corp | Production of directional silicon steel plate of superior repetitive bending characteristic |
| CN102041367A (en) * | 2009-10-23 | 2011-05-04 | 宝山钢铁股份有限公司 | Manufacturing method of thin strip continuously cast and cold rolled non-oriented electrical steel |
| CN102453838A (en) * | 2010-10-25 | 2012-05-16 | 宝山钢铁股份有限公司 | High-strength non-oriented electrical steel with high magnetic induction and manufacturing method thereof |
| CN202007263U (en) * | 2011-03-30 | 2011-10-12 | 广东顺德浦项钢板有限公司 | Silicon steel annealing furnace |
| CN103451399A (en) * | 2013-08-29 | 2013-12-18 | 河北钢铁股份有限公司唐山分公司 | Annealing process for producing cold rolling non-oriented electrical steel |
| WO2015180501A1 (en) * | 2014-05-30 | 2015-12-03 | 宝山钢铁股份有限公司 | Reducing gas circulation recycling system for pickling-free continuous annealing furnace and utilisation method therefor |
| CN104762450A (en) * | 2015-03-13 | 2015-07-08 | 内蒙古包钢钢联股份有限公司 | Annealing process of producing SPCC continuous-annealing board with silicon steel annealing furnace |
| CN107587039A (en) * | 2017-08-30 | 2018-01-16 | 武汉钢铁有限公司 | The driving motor for electric automobile non-orientation silicon steel and production method of excellent magnetic |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111926171A (en) | 2020-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102861788B (en) | Hot shaping method of large-specification titanium plate | |
| CN106755821A (en) | Heat treatment production analogue means and experimental technique | |
| CN213137529U (en) | Cooling device for calender | |
| CN114318127B (en) | Production method of ultra-low anisotropy non-oriented silicon steel for super-large generator | |
| CN106755871A (en) | A kind of cold-rolled strip manufacture method for deep-draw application high | |
| CN111926171B (en) | Continuous annealing cooling control method for cold-rolled non-oriented silicon steel strip | |
| US8480949B2 (en) | Gas-jet cooling apparatus for continuous annealing furnace | |
| CN108296285A (en) | A kind of milling method of ultralow-carbon bainite steel plate | |
| CN113652622A (en) | Method and system suitable for optimizing cooling process of fan of galvanizing unit | |
| CN218985734U (en) | Cooling type winding device for film blowing machine | |
| CN208829722U (en) | A kind of galvanization annealing furnace steel edge portion electromagnetic induction heating temperature compensation means | |
| CN210156515U (en) | Battery liquid cooling plate | |
| CA1163539A (en) | Method for heat treatment of metal strips | |
| CN113444872A (en) | Temperature optimal setting method for preventing C warping of band steel of hot-dip aluminum-zinc unit | |
| CN105937854A (en) | Application of air cooling technology to electric furnace | |
| CN209081933U (en) | A kind of steel strip annealing furnace | |
| CN115558749A (en) | Method and system for improving shape of non-oriented silicon steel plate in continuous annealing process | |
| CN103882219A (en) | Slab heating method in silicon steel hot-rolling process | |
| CN204369935U (en) | Two fans equal autoclaving stove refrigerating unit | |
| CN218232533U (en) | Heat treatment device for aluminum foil laminating composite treatment | |
| CN210788617U (en) | Forced cooling device for cooling bed and cooling bed adopting same | |
| CN110358977A (en) | Silicon steel thin belt and its manufacturing method | |
| CN217503977U (en) | Residual heat fan heater | |
| CN103031421A (en) | Production method of non-oriented electrical steel coating semi-processed product | |
| CN220034343U (en) | Heat exchange furnace for ink glass production and production line thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |