WO2019080482A1 - 快速加热冷轧带钢的装置与方法 - Google Patents

快速加热冷轧带钢的装置与方法

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Publication number
WO2019080482A1
WO2019080482A1 PCT/CN2018/087069 CN2018087069W WO2019080482A1 WO 2019080482 A1 WO2019080482 A1 WO 2019080482A1 CN 2018087069 W CN2018087069 W CN 2018087069W WO 2019080482 A1 WO2019080482 A1 WO 2019080482A1
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Prior art keywords
heating
heating section
temperature
section
strip
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.)
Ceased
Application number
PCT/CN2018/087069
Other languages
English (en)
French (fr)
Chinese (zh)
Inventor
章华兵
李国保
刘宝军
韩丹
张鑫强
崔光华
陈建兵
肖稳
赵自鹏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baoshan Iron and Steel Co Ltd
Original Assignee
Baoshan Iron and Steel Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Baoshan Iron and Steel Co Ltd filed Critical Baoshan Iron and Steel Co Ltd
Priority to AU2018357807A priority Critical patent/AU2018357807B2/en
Priority to US16/650,074 priority patent/US11352680B2/en
Priority to CA3075200A priority patent/CA3075200C/en
Priority to EP18871319.2A priority patent/EP3702476A4/en
Priority to JP2020516851A priority patent/JP7117372B2/ja
Priority to KR1020207008811A priority patent/KR20200047613A/ko
Publication of WO2019080482A1 publication Critical patent/WO2019080482A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • H05B6/103—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor
    • H05B6/104—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor metal pieces being elongated like wires or bands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • 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
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • 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
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • 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
    • 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
    • C21D9/60—Continuous furnaces for strip or wire with induction heating
    • 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
    • C21D9/62—Continuous furnaces for strip or wire with direct resistance heating
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • H05B6/362—Coil arrangements with flat coil conductors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the invention relates to the technical field of steel production, in particular to a device and a method for rapidly heating an oriented silicon steel cold-rolled strip with a mass fraction of 4.5% or less.
  • a low iron loss high magnetic induction oriented silicon steel used as a transformer core requires extremely stringent temperature management requirements in the decarburization annealing process in its manufacturing process. If the strip temperature at the outlet of the heating section is low, the effective decarburization time is reduced, and the decarburization effect is poor; if the strip is heated at a high temperature in the heating section, the target soaking temperature may be exceeded in a short time, and a dense oxide film is formed too early. It hinders decarburization and decarburization is not good. In short, the temperature fluctuation of the heating section not only affects the decarburization stability but also causes the magnetic properties to fluctuate, and also greatly increases the incidence of surface defects of the finished product.
  • Induction heating methods are the most widely used and most mature methods compared to other rapid heating methods, such as energized rapid heating.
  • the Chinese patent discloses an annealing device whose heating section can be divided into three sections, wherein: the first heating section is a radiant heating section that uses gas heating or electric heating to heat the steel strip to less than the Curie temperature. Tc-50 ° C; the second heating section is a high-frequency induction heating section, the strip is heated to a Curie temperature Tc-30 ° C to a Curie temperature Tc - 5 ° C; the third heating section is similar to the structure of the first heating section, The radiant heating section heats the strip to a target temperature exceeding the Curie temperature Tc.
  • the first heating section is a radiant heating section that uses gas heating or electric heating to heat the steel strip to less than the Curie temperature. Tc-50 ° C
  • the second heating section is a high-frequency induction heating section, the strip is heated to a Curie temperature Tc-30 ° C to a Curie temperature Tc - 5 ° C
  • the third heating section is similar to the structure of the first heating section, The radiant heating section heats the strip
  • the main feature of the heating section of the annealing equipment is that there is a section of rapid induction heating in the middle of the heating section, the biggest disadvantage of which is: (1) subject to the maximum capacity of an induction heating device, the outlet plate temperature of the first heating section is usually It cannot be lower than the Curie temperature Tc-150 ° C, and the outlet plate temperature of the first heating section must be 500 ° C or more. For thick strip steel or unit speed, the outlet temperature of the first heating section needs to be further increased, otherwise the strip temperature at the exit of the second heating section cannot reach or approach the Curie temperature Tc, which leads to the strip width along the strip.
  • the temperature uniformity of the direction is deteriorated, thus restricting the further improvement of production efficiency; (2)
  • the rapid temperature rise curve is single, which is not conducive to precise control of the primary recrystallization texture, and the effect of improving the magnetic properties of the finished product is limited; (3) due to cold rolling
  • the surface state of the strip is fluctuated and the heating condition of the first heating section fluctuates.
  • the temperature of the outlet plate of the first heating section generally fluctuates greatly.
  • Chinese patent (CN104603298A) discloses an annealing device, wherein the heating section can be divided into four sections, wherein: the first section is an induction heating section, and at least one induction heating device is provided; and the second section is a length of 1 to 30 m.
  • the heating stop zone or the slow heating zone with a heating rate of 0 to 10 ° C / s, the second plate temperature is between 250 and 600 ° C;
  • the third segment is also the induction heating section, and is also equipped with at least one induction heating device;
  • the fourth paragraph is the conventional radiant heating section. It is important to point out that the role of the second stage is to make the temperature distribution inside the strip after rapid heating uniform, thereby achieving the shape and magnetic properties of the strip.
  • the main feature of the heating section of the annealing equipment is that two or more induction heating devices are used from the room temperature to rapidly raise the strip to the vicinity of the Curie temperature Tc.
  • the disadvantage of this method is: (1) due to the strip steel Heating at room temperature to near the Curie temperature Tc requires at least three or even four induction heating devices in series, otherwise the product specifications or unit speed are limited; (2) Since the cold rolled strip is subjected to a very high heating rate before the annealing is resumed It is necessary to add another temperature buffer at 250-600 °C. Otherwise, the shape and magnetic properties of the strip are deteriorated due to problems such as stress concentration and uneven plate temperature.
  • the present invention provides an apparatus and method for an oriented silicon steel cold-rolled strip with a high heating temperature and high precision of the heating section, excellent magnetic properties and surface quality, and a rapid heating mass fraction of 4.5% or less Si content. .
  • the present invention provides an apparatus and method for rapidly heating a cold-rolled strip by increasing two inductive heating devices in the middle of a heating section of a conventional annealing furnace to increase production efficiency and reduce energy consumption per ton of steel, and at the same time increase plate temperature. Control accuracy and quality of finished products.
  • an apparatus for rapidly heating a cold-rolled steel strip comprises a heating zone, a soaking zone and a cooling zone, and the heating zone is sequentially divided into first heating along a moving direction of the steel strip to be heated. a segment, a second heating segment, a third heating segment, and a fourth heating segment, wherein
  • the first heating section is provided with a first radiant heating mechanism by gas heating or electric heating, so that the first heating section can heat the strip to a temperature between 200 ° C and a target Curie temperature of 100 ° C or less. In the range;
  • the second heating section is capable of heating the strip to a temperature between 300 ° C and the target Curie temperature of 50 ° C Within the following range;
  • a third induction heating mechanism using a second induction coil is disposed in the third heating section, so that the third heating section can heat the steel strip to a temperature 30 ° C below the target Curie temperature Within the range of 3 ° C below the target Curie temperature;
  • the fourth heating section is provided with a second radiant heating mechanism by gas heating or electric heating, so that the fourth heating section can heat the strip to a temperature greater than the target Curie temperature.
  • At least one first plate thermometer of different wavelength is disposed between the first heating segment and the second heating segment, and at least one is disposed between the second heating segment and the third heating segment
  • a second plate thermometer of different wavelengths, at least one third plate thermometer of different wavelengths is disposed between the third heating section and the fourth heating section.
  • the first induction heating mechanism includes a first rectifier connected in sequence, a first inverter, and a first oscillation circuit including a first induction coil, the first inverter receiving the first rectifier provided The first direct current is converted into a first high frequency current and supplied to the first oscillating circuit;
  • the second induction heating mechanism includes a second rectifier connected in sequence, a second inverter, and a second oscillation including a second induction coil a loop, the second inverter receives the second direct current provided by the second rectifier and converts it into a second high frequency current to be supplied to the second oscillating circuit.
  • the current frequency of the first induction heating mechanism and the second induction heating mechanism ranges from 100 to 1000 KHz.
  • the present invention also provides a method of rapidly heating a cold-rolled strip by heating the strip to be heated using the above-described apparatus for rapidly heating the cold-rolled strip.
  • the first target plate temperature of the outlet of the first heating section is 400 to 550 °C.
  • the second target plate temperature of the outlet of the second heating section is set according to the heating rate of the third heating section, and the heating rate of the third heating section is 50-150 ° C / s.
  • the power control method of the second heating section is: adjusting the heating power of the second heating section according to a comparison result of the second target panel temperature and the detected value of the second panel thermometer.
  • the power control method of the third heating section is: setting an initial power of the third heating section and a third target panel temperature of the third heating section outlet, according to the third target panel temperature and the third A result of the comparison of the detected values of the plate thermometer, the heating power of the third heating section is adjusted based on the initial power.
  • the power control method of the third heating section is: setting a target impedance of the third heating section, and adjusting the third according to a comparison result of the target impedance and the operating impedance of the third heating section Heating power of the heating section.
  • the device and method for rapidly heating cold-rolled strip steel of the invention combines two induction heating devices in the middle of the heating zone of the conventional annealing furnace to form four sections of the heating zone, wherein the purpose of setting the first heating section is to effectively avoid Direct rapid heating at room temperature causes problems with strip type and magnetic properties; two induction heating sections of the second heating section and the third heating section are provided, and the overall length of the heating zone can be shortened compared with the existing one-stage induction heating section. And reduce the initial temperature of rapid heating, thereby increasing production efficiency and reducing energy consumption per ton of steel.
  • FIG. 1 is a schematic structural view of an apparatus for rapidly heating a cold-rolled strip according to an embodiment of the present invention
  • FIG. 2 is a schematic structural view of a first induction heating mechanism according to an embodiment of the present invention.
  • an apparatus for rapidly heating a cold-rolled strip 10 includes a heating zone, a soaking zone, and a cooling zone.
  • the heating zone is sequentially divided into a first heating section 1, a second heating section 2, a third heating section 3 and a fourth heating section 4 along the moving direction of the strip 10 to be heated, specifically, the first heating section 1 And the fourth heating section 4 is a radiant heating section, and the second heating section 2 and the third heating section 3 are induction heating sections.
  • the first heating section 1 is provided with a first radiant heating mechanism 5 by gas heating or electric heating, so that the first heating section 1 can heat the strip 10 to a temperature of 200 ° C to the target residence.
  • the temperature is in the range of 100 °C.
  • the selection of the outlet plate temperature of the first heating section 1 mainly considers the safety and economy of the annealing furnace, and takes into consideration the quality requirements of the finished product.
  • the second heating section 2 is provided with a first induction heating mechanism using the first induction coil, so that the second heating section 2 can heat the steel strip 10 to a temperature ranging from 300 ° C to a target Curie temperature of 50 ° C.
  • the selection of the outlet plate temperature of the second heating section 2 mainly considers the requirements of the magnetic properties of the finished product, and takes into consideration the efficiency of induction heating.
  • the third heating section 3 is provided with a second induction heating mechanism using the second induction coil, so that the third heating section 3 can heat the steel strip 10 to a temperature 30 ° C below the target Curie temperature to below the target Curie temperature 3 Within the range of °C.
  • the closer the outlet plate temperature of the third heating section 3 is to the target Curie temperature the better the temperature uniformity of the strip 10 in the width direction, and the higher the use efficiency of the induction heating device.
  • the strip 10 reaches or approaches the target Curie temperature, a magnetic transition occurs, the magnetic permeability of the strip 10 is drastically lowered, and the heating efficiency of the strip 10 is also rapidly lowered. At this time, the voltage fluctuation of the induction heating device is large. It will affect the temperature uniformity of the length of the strip 10 and the stable operation of the induction heating device.
  • the fourth heating section 4 is provided with a second radiant heating mechanism 6 by gas heating or electric heating, so that the fourth heating section 4 can heat the strip 10 to a temperature greater than the target Curie temperature, thereby completing the strip steel. 10 heating process.
  • At least one first plate thermometer of different wavelength is disposed between the first heating section 1 and the second heating section 2, and at least one is disposed between the second heating section 2 and the third heating section 3.
  • a second plate thermometer of different wavelengths, at least one third plate thermometer of different wavelengths is disposed between the third heating section 3 and the fourth heating section 4, and the outlet plate temperature of each heating section can be accurately measured.
  • the first panel thermometer, the second panel thermometer and the third panel thermometer can all adopt an infrared temperature sensor, and the working principle is to measure the surface temperature of the strip 10 by a non-contact method.
  • the use of multiple wavelengths compensates for variable emissivity, light interference, and temperature calibration, so temperature measurement accuracy is higher in low temperature observations or in atmospheres containing steam.
  • At least one first plate thermometer is disposed between the first heating section 1 and the second heating section 2 for detecting the outlet plate temperature of the first heating section 1.
  • At least one second plate thermometer is disposed between the second heating section 2 and the third heating section 3 for detecting the actual plate temperature of the position strip 10.
  • the detection environment is good, but since the panel temperature is usually lower than 700 ° C, the strip 10 radiance is easily taken.
  • the influence of the surface state of the steel 10 can be improved by a plate thermometer which preferably has a plurality of wavelengths.
  • At least one third plate thermometer is disposed between the third heating section 3 and the fourth heating section 4 for detecting the actual plate temperature of the position strip 10. Since the position plate thermometer is susceptible to the radiant tube in the fourth heating section 4, and the outlet plate temperature of the third heating section 3 is usually below 750 ° C, the strip 10 radiance is also susceptible to the surface state of the strip 10 Effect, therefore, although the measurement accuracy can be improved by a plate thermometer of preferably a plurality of wavelengths, considering the importance of the longitudinal/transverse plate temperature control of the outlet of the third heating section 3, the measurement accuracy is usually not directly used for the plate temperature feedback. control.
  • FIG. 2 is a schematic structural view of a first induction heating mechanism
  • the first induction heating mechanism includes a first rectifier 7 connected in sequence, a first inverter 8 and a first induction coil.
  • An oscillating circuit 9 supplies a first direct current to the first inverter 8 composed of a transistor through the first rectifier 7, and a first high frequency current is supplied from the first inverter 8 to the first oscillating circuit.
  • the second induction heating mechanism is similar to the first induction heating mechanism, and the second induction heating mechanism includes a second rectifier, a second inverter, and a second oscillation circuit including the second induction coil, which are sequentially connected to the transistor through the second rectifier.
  • the second inverter is configured to provide a second direct current, and the second inverter provides a second high frequency current to the second oscillating circuit.
  • the excitation current frequency of the induction heating mechanism has an important influence on the penetration depth of the induced current.
  • the lower the excitation current frequency the deeper the penetration depth of the induced current. If the thickness of the strip 10 is less than 2.5 times the penetration depth, the current is greatly weakened, making it difficult to perform low-cost heating. Therefore, if the current frequency of the first induction heating mechanism and the second induction heating mechanism is lower than 100 kHz, the penetration depth of the induced current is deep, and the surface temperature of the strip 10 is slow to rise, which is difficult to meet the process requirements of the thin strip 10; The current frequency is higher than 1000 kHz, and the manufacturing cost of the induction heating mechanism is significantly increased.
  • the current frequency of the first induction heating mechanism and the second induction heating mechanism ranges from 100 to 1000 kHz.
  • the current frequency ranges from 300 to 700 kHz, which can meet the rapid heating requirements of extremely thin gauges such as 0.15 mm thick oriented silicon steel, and can also control the manufacturing cost of the induction heating mechanism to a reasonable level.
  • the present invention also provides a method of rapidly heating the cold-rolled strip 10 by heating the strip 10 to be heated by the apparatus for rapidly heating the cold-rolled strip 10 of the above-described embodiment of the present invention.
  • the selection of the outlet plate temperature of the first heating section 1 mainly considers the safety and economy of the annealing furnace, and takes into consideration the quality requirements of the finished product. If the first target plate temperature T 1 at the outlet of the first heating section 1 is lower than 400 ° C, the furnace temperature in the first heating section 1 is usually lower than 750 ° C. For the high hydrogen protection atmosphere, the annealing furnace has a safety hazard. If the first target plate temperature T 1 at the outlet of the first heating section 1 is higher than 550 ° C, the operating economy of the induction heating device is lowered, and therefore, the first target plate temperature T 1 of the first heating section 1 is 400 to 550 ° C. .
  • the first radiant heating mechanism 5 is employed at 400 ° C or less, and the heating efficiency is high and the temperature uniformity of the strip 10 in the width direction is good, and the operating energy consumption can be further reduced by utilizing the heat of the exhaust gas in the soaking zone.
  • the second target panel temperature at the outlet of the second heating section 2 is set according to the temperature increase rate of the third heating section 3.
  • the temperature increase rate of the third heating section 3 is preferably from 50 to 150 ° C/s from the viewpoint of the magnetic properties of the finished product.
  • the power control method of the second heating section 2 is specifically: adjusting the heating power of the second heating section 2 according to the comparison result of the second target panel temperature T 2 and the detected value of the second panel thermometer.
  • the second target panel temperature setting value T 2A may be set in the control program, the second panel thermometer detection value is compared with the second target panel temperature setting value T 2A , and the induction heating power is dynamically adjusted.
  • the outlet plate temperature of the second heating section 2 approaches the second target plate temperature setting value T 2A , thereby achieving stable control of the outlet plate temperature of the second heating section 2, and dynamically adjusting the induction heating device according to the difference between T 2 and T 2A Operating voltage and operating current.
  • the power control method of the third heating section 3 is: setting the initial power of the third heating section 3 and the third target panel temperature of the outlet of the third heating section 3, according to the third target panel temperature and the third board As a result of the comparison of the detected values of the thermometer, the heating power of the third heating section 3 is adjusted based on the initial power.
  • the initial power P 20 is calculated as:
  • ⁇ is the density of the strip 10
  • E is the specific energy of the strip 10
  • R is the resistivity of the strip 10
  • ⁇ is the thickness of the strip 10
  • W is the width of the strip 10
  • V1 is the moving speed of strip 10
  • ⁇ T is the set temperature difference, which is the process parameter.
  • the calculation formula of the initial power P 20 is a theoretical formula. In the actual production process, it can be obtained based on the outlet plate temperature and the characteristic parameters of the strip 10, the strip size parameter and the process parameters.
  • K1 is a constant related to the material properties. In actual production, different K1 values can be given according to different strip 10 characteristics.
  • the third target panel temperature setting value T 3A at the outlet of the third heating section 3 can be set, and the detected value of the third panel thermometer is compared with the third target panel temperature setting value T 3A , and dynamically adjusted.
  • the induction heating power causes the outlet plate temperature of the third heating section 3 to approach the third target plate temperature setting value T 3A .
  • this setting method is equivalent to adding a dynamic compensation module based on the third target panel temperature setting value T 3A on the basis of the initial power.
  • at least two third plate thermometers, at least one third may be disposed between the third heating section 3 and the fourth heating section 4.
  • the plate thermometer is used for plate temperature compensation, and at least one third plate thermometer is used for plate temperature monitoring.
  • the target impedance Z 2A of the two induction heating mechanisms can be set in the control program, the operating impedance Z 2 is compared with the target impedance Z 2A , and the induction heating power is dynamically adjusted so that the operating impedance Z 2 approaches the target impedance Z 2A , that is, at the initial Based on the power, a dynamic compensation module based on the target impedance Z 2A is added.
  • the target impedance Z 2A is determined by the integrated induction heating theory and process requirements, and the influence of the strip 10 width needs to be considered.
  • the chemical element weight percentage is: C: 0.035 to 0.120%, Si: 2.9 to 4.5%, Mn: 0.05 to 0.20%, P: 0.005 to 0.050%, S: 0.005 to 0.012%, Als: 0.015 to 0.035% , N: 0.001 to 0.010%, Cr: 0.05 to 0.30%, Sn: 0.005 to 0.200%, V: ⁇ 0.0100%, and Ti: ⁇ 0.0100% of the slab is produced by the following steps: heating the slab at 1150 ° C Rolling to a hot-rolled sheet having a thickness of 2.3 mm; normalizing annealing; cold rolling to a target thickness, wherein the cold rolling thickness is 0.29 mm; cleaning the surface of the cold-rolled strip to remove rolling oil and iron; the decarburization annealing unit respectively Decarburization annealing is carried out by using a conventional radiant tube, a Chinese patent (CN101652485A) and an annealing apparatus according to an embodiment of the present invention;
  • Comparative Example 1-2 corresponds to test data of a conventional radiant tube
  • Comparative Example 3-5 corresponds to test data of a Chinese patent (CN101652485A)
  • Examples 1-5 correspond to test data of an embodiment of the present invention.
  • Comparative Example 3 to Comparative Example 5 the three-stage heating method disclosed in the Chinese patent (CN101652485A) was employed.
  • the unit speed of the comparative example 3 is 90 m/min, the outlet plate temperature T1 of the first heating section is 600 ° C, the energy consumption per ton of steel is decreased by 4.0%; the unit speed of the comparative example 4 is 90 m/min, and the first heating section outlet plate
  • the temperature T1 is 550 °C, and the energy consumption per ton of steel is decreased by 4.9%.
  • due to the low temperature rise initial temperature it is subject to the working capacity of an induction heating device, and the rapid temperature rise end temperature is low, which leads to poor decarburization effect.
  • the carbon content after decarburization was 41 ppm; the unit speed of Comparative Example 5 was 95 m/min, the outlet plate temperature of the first heating section was 600 ° C, and the energy consumption per ton of steel decreased by 8.2%, which was also subject to the capability of an induction heating device.
  • the carbon content after decarburization is still relatively high at 33 ppm.
  • the unit speeds of Examples 1 to 3 are both 90 m/min, and the outlet plate temperatures of the first heating section are 550 ° C, 500 ° C and 400 ° C, respectively, and the energy consumption per ton of steel decreases by 4.7%, 6.1% and 7.6%, respectively.
  • the carbon content after decarburization satisfies the requirement of ⁇ 30 ppm.
  • the unit speed of the embodiment 4 is 95 m/min, the outlet plate temperature of the first heating section is 520 ° C, the energy consumption per ton of steel is decreased by 10.6%; the unit speed of the embodiment 5 is 98 m/min, and the rapid temperature rise starting temperature is 540 ° C.
  • the energy consumption per ton of steel decreased by 12.1%.
  • the carbon content after decarburization of Comparative Example 9 and Comparative Example 10 met the process requirements. It can be seen that under the same conditions, the energy consumption per ton of steel in the technical solution of the invention is significantly reduced.
  • the decarburization annealing unit adopts the device for rapidly heating the cold-rolled strip steel according to the embodiment of the present invention, and the decarburization annealing unit has a speed of 90 m/min.
  • a multi-wavelength first plate thermometer is disposed between the first heating segment and the second heating segment, and a multi-wavelength second plate thermometer is disposed between the second heating segment and the third heating segment.
  • Two multi-wavelength third plate thermometers are disposed between the three heating sections and the fourth heating section. Among them, Table 2 counts the plate temperature under different induction heating power control modes.
  • the first induction heating mechanism and the second induction heating mechanism of Comparative Example 6 both adopt an initial power mode, wherein the initial power of the first induction heating mechanism is 150 KW, and the initial power of the second induction heating mechanism is 430 KW.
  • the average temperature of the outlet plate of the first heating section is 500.1 ° C, and the mean square error is 5.5 ° C; the average temperature of the outlet plate of the second heating section is 585.8 ° C, and the mean square error is 6.8 ° C; the average temperature of the outlet plate of the third heating section is 719.3 ° C.
  • the plate temperature average deviation is 5.1 ° C, and the surface defect rate of the finished product is 6.0%.
  • the first induction heating mechanism of Embodiment 6 adopts a panel temperature feedback power control mode, and the second induction heating mechanism adopts an initial power mode.
  • the average temperature of the outlet plate of the first heating section was 500.3 ° C, and the mean square error was 5.1 ° C, which was similar to that of Comparative Example 6.
  • the mean square error of the outlet plate was reduced to 0.08 °C. Since the temperature stability of the outlet plate of the second heating section is improved, by increasing the initial power of the second induction heating mechanism, the temperature fluctuation of the outlet plate of the third heating section is also correspondingly reduced, and the average temperature of the outlet plate is 729.8 ° C, and the mean square error is 1.3. °C, the average temperature of the exit plate is closer to the target Curie temperature of the strip, and the incidence of surface defects of the finished product drops to 1.5%.
  • the first induction heating mechanism in Embodiment 7 adopts a plate temperature feedback power control mode
  • the second induction heating mechanism adopts a plate temperature compensation power control mode
  • a third plate temperature gauge between the third heating segment and the fourth heating segment For plate temperature compensation, a third plate thermometer is used for plate temperature monitoring, and the third target plate temperature setting T 3A is set to 733 °C.
  • the temperature fluctuation of the outlet plate of the third heating section is further reduced, and the monitoring plate temperature meter shows that the average temperature of the outlet plate of the third heating section is 730.5 ° C, the mean square error is 1.0 ° C, and the incidence of surface defects of the finished product is reduced to ⁇ 0.5%.
  • the first induction heating mechanism adopts a plate temperature feedback power control mode
  • the second induction heating mechanism adopts an impedance compensation power control mode
  • the target impedance Z 2A is set to 1.6.
  • the temperature control of the outlet plate of the third heating section is relatively high, the average temperature of the outlet plate is 733.1 ° C, the mean square error is 0.6 ° C, and the incidence of surface defects of the finished product is reduced to ⁇ 0.5%.
  • control panel temperature of the second heating section in the sixth to the eighth embodiment and the outlet plate temperature of the third heating section are significantly improved, and the incidence of surface defects of the finished product is also obvious. decline.
  • Comparative Example 7 and Comparative Example 8 were heated by a conventional radiant tube, and Comparative Examples 9 to 11 were all heated by an annealing apparatus of the Chinese patent (CN101652485A).
  • the apparatus for rapidly heating the cold-rolled strip steel according to the embodiment of the present invention is used for heating, and the first induction heating mechanism is provided with a plate temperature feedback power control mode, and the second induction heating mechanism is controlled by impedance compensation power. the way.
  • Table 3 was obtained by collecting test data of the above test.
  • the cold rolling thickness of Comparative Example 7 is 0.29 mm
  • the unit speed is 90 m/min
  • the carbon content after decarburization satisfies the process requirement of ⁇ 30 ppm
  • the obtained magnetic induction B 8 is 1.916 T
  • iron loss P 17/50 was 0.974 W/Kg
  • the surface defect rate was 6.0%.
  • the unit speed of the comparative example 8 was 95 m/min.
  • the decarburization effect was poor due to the increase in the decarburization time of the unit speed.
  • the carbon content after decarburization was 48 ppm
  • the obtained magnetic induction B 8 was 1.865 T
  • the iron loss P 17/ 50 was 1.123 W/Kg
  • the surface defect incidence rate was 10.5%.
  • the cold rolling thickness of Comparative Example 9 was 0.29 mm, the unit speed was 90 m/min, the outlet plate temperature of the first heating section was between 590 and 610 ° C, and the outlet plate temperature of the second heating section was between 723 and 733 ° C, and cold rolling was performed.
  • the carbon content after decarburization of the plate satisfies the process requirement of ⁇ 30 ppm, and the obtained magnetic induction B 8 is 1.918 T, the iron loss P 17/50 is 0.968 W/Kg, and the surface defect incidence rate is 1.5%.
  • the cold rolling thickness of Comparative Example 10 was 0.29 mm, the unit speed was 95 m/min, the outlet plate temperature of the first heating section was between 610 and 630 ° C, and the outlet plate temperature of the second heating section was between 725 and 735 ° C, and cold rolling was performed.
  • the carbon content after decarburization of the sheet was 39 ppm, and the obtained magnetic induction B 8 was 1.905 T, the iron loss P 17/50 was 0.996 W/Kg, and the surface defect incidence was 2.4%.
  • the cold rolling thickness of Comparative Example 11 was 0.35 mm, the unit speed was 80 m/min, the outlet plate temperature of the first heating section was between 640 and 660 ° C, and the outlet plate temperature of the second heating section was between 716 and 728 ° C, and decarburization.
  • the carbon content after the film was 43 ppm, and the obtained magnetic induction B 8 was 1.884 T, the iron loss P 17/50 was 1.123 W/Kg, and the surface defect occurrence rate was 3.7%.
  • the cold rolling thickness of the embodiment 9 is 0.22 mm, the unit speed is 110 m/min, the outlet plate temperature of the first heating section is between 530 and 550 ° C, and the outlet plate temperature of the second heating section is controlled at 599 to 601 ° C, and the third heating is performed.
  • the exit plate temperature of the segment is between 730 and 736 ° C.
  • the carbon content after decarburization satisfies the process requirement of ⁇ 30 ppm.
  • the obtained magnetic induction B 8 is 1.932 T, and the iron loss P 17/50 is 0.837 W/Kg.
  • the incidence of surface defects ⁇ 0.5%.
  • the cold rolling thickness of the embodiment 10 is 0.29 mm, the unit speed is 90 m/min, the outlet plate temperature of the first heating section is between 490 and 510 ° C, and the outlet plate temperature of the second heating section is controlled at 599 to 601 ° C, and the third heating is performed.
  • the exit plate temperature of the segment is between 730 and 736 °C, and the carbon content after decarburization satisfies the process requirement of ⁇ 30 ppm.
  • the obtained magnetic induction B 8 is 1.935 T, the iron loss P 17/50 is 0.942 W/Kg, and the surface defect rate is ⁇ 0.5%.
  • the unit speed of the embodiment 11 is increased to 95 m/min
  • the outlet plate temperature of the first heating section is between 510 and 530 ° C
  • the outlet plate temperature of the second heating section is controlled at 609 to 611 ° C
  • the third heating is performed.
  • the exit plate temperature of the segment is between 730 and 736 °C
  • the carbon content after decarburization meets the process requirement of ⁇ 30 ppm.
  • the obtained magnetic induction B 8 is 1.938 T
  • the iron loss P 17/50 is 0.947 W/Kg.
  • the incidence of surface defects ⁇ 0.5%.
  • the unit speed of the embodiment 12 is further increased to 98 m/min
  • the outlet plate temperature of the first heating section is 530-550 ° C
  • the outlet plate temperature of the second heating section is controlled to be 619-621 ° C
  • the outlet plate temperature of the three heating sections is between 730 and 736 ° C.
  • the carbon content after decarburization satisfies the process requirement of ⁇ 30 ppm.
  • the obtained magnetic induction B 8 is 1.928 T and the iron loss P 17/50 is 0.953 W/Kg.
  • the incidence rate is ⁇ 0.5%.
  • the cold rolling thickness of the embodiment 13 is 0.35 mm, the unit speed is 80 m/min, the outlet plate temperature of the first heating section is between 570 and 590 ° C, and the outlet plate temperature of the second heating section is controlled to be 659 to 661 ° C, and the third heating is performed.
  • the exit plate temperature of the segment is between 727 and 733 °C, and the carbon content after decarburization satisfies the process requirement of ⁇ 30 ppm.
  • the obtained magnetic induction B 8 is 1.927 T, the iron loss P 17/50 is 1.097 W/Kg, and the surface defect rate ⁇ 0.5%.
  • the process setting of the embodiment of the invention is flexible, the magnetic properties of the finished product are excellent, the incidence of surface defects is low, and the speed of the unit can be further improved, thereby improving the production efficiency.
  • the device and method for rapidly heating the cold-rolled strip steel provided by the embodiments of the present invention can fully utilize the characteristics of high-frequency induction heating and rapid heating rate, and adopt the plate temperature segmentation control method to make the heating system strictly enforced.
  • the utility model can effectively overcome the influence of the fluctuation of the surface state of the strip steel and the fluctuation of the heating condition, the plate temperature control precision is high, and the magnetic properties and surface quality of the finished product are superior.
  • the embodiment of the present invention can very conveniently select the target plate temperature of each heating section, and by using the segmented heating rate to increase the temperature, the flexibility of the process setting and the adaptability of the product specifications can be enhanced.
  • the apparatus and method for rapidly heating the cold-rolled strip steel are not only suitable for rapidly heating the oriented silicon steel cold-rolled strip with a mass fraction of 4.5% or less, but also for any cold having a Curie point.
  • Rolled strip steel for example, ferritic stainless steel or martensitic stainless steel containing a Cr content of 18% or less by mass.

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