WO2023074467A1 - 熱延鋼帯の焼鈍方法 - Google Patents

熱延鋼帯の焼鈍方法 Download PDF

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Publication number
WO2023074467A1
WO2023074467A1 PCT/JP2022/038751 JP2022038751W WO2023074467A1 WO 2023074467 A1 WO2023074467 A1 WO 2023074467A1 JP 2022038751 W JP2022038751 W JP 2022038751W WO 2023074467 A1 WO2023074467 A1 WO 2023074467A1
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Prior art keywords
steel strip
temperature
heating
hot
annealing
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Ceased
Application number
PCT/JP2022/038751
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English (en)
French (fr)
Japanese (ja)
Inventor
弘和 小林
行宏 松原
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JFE Steel Corp
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JFE Steel Corp
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Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to US18/693,688 priority Critical patent/US20240392403A1/en
Priority to CN202280071190.9A priority patent/CN118139995A/zh
Priority to EP22886795.8A priority patent/EP4394056A4/en
Priority to JP2023513752A priority patent/JP7558476B2/ja
Priority to KR1020247017223A priority patent/KR20240090874A/ko
Publication of WO2023074467A1 publication Critical patent/WO2023074467A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment
    • C21D8/1272—Final recrystallisation 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of 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
    • 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
    • C21D6/008—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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the working steps
    • C21D8/1222—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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment
    • C21D8/1261—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment following hot rolling
    • 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
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to a method of annealing a hot-rolled steel strip (hot-rolled steel strip) used in the manufacture of electrical steel sheets.
  • annealing hot-rolled sheet annealing
  • the hot-rolled sheet annealing is usually performed using continuous annealing equipment having a heating zone, a soaking zone and a cooling zone.
  • the annealing temperature in hot-rolled steel strip annealing greatly affects the magnetic properties of the product steel strip, and it is necessary to control the temperature of the hot-rolled steel strip so that it is constant and uniform over the entire length and width of the hot-rolled steel strip. Therefore, in the continuous annealing equipment described above, the furnace temperature of the soaking zone is kept constant in order to control the heating temperature of the hot-rolled steel strip to be annealed within a suitable range.
  • Patent Literature 1 discloses a technique for reducing the aging index of a steel sheet before final cold rolling in the production of grain-oriented electrical steel sheets by controlling the cooling rate in hot-rolled steel sheet annealing.
  • Patent Document 2 discloses a hot-rolled sheet annealing technique for a Si-containing steel sheet that rapidly heats a steel strip in hot-rolled sheet annealing.
  • Patent Document 1 discloses that hot-rolled sheet annealing is performed to improve the hot-rolled sheet structure of a grain-oriented electrical steel sheet
  • the heating temperature for hot-rolled sheet annealing can be controlled with high precision.
  • rapid heating in hot-rolled sheet annealing is used as means for improving descaling properties after annealing, and no reference is made to increasing the accuracy of the heating temperature after rapid heating.
  • the present invention solves the above-mentioned problems of the prior art, and is a hot-rolling apparatus capable of controlling with high accuracy the temperature of the steel strip on the exit side of the heating band in hot-rolled sheet annealing, and by extension, the temperature of the steel strip on the exit side of the soaking furnace.
  • An object of the present invention is to provide a steel strip annealing method.
  • the temperature of the steel strip on the exit side of the heating strip refers to the temperature of the steel strip at the outlet of the heating strip.
  • a continuous annealing furnace having a heating zone, a soaking zone and a cooling zone , A plate thickness gauge and a rapid heating device are installed on the upstream side of the soaking zone. Furthermore, the present inventors have found that it is effective to change the heating temperature of the steel strip in the rapid heating device in accordance with the variation of the LSD (thickness x strip threading speed) of the steel strip, leading to the development of the present invention.
  • the method of annealing a hot-rolled steel strip for electrical steel sheets according to the present invention is configured as follows.
  • a hot-rolled steel strip for electrical steel sheets containing 1.6 to 5.0 mass% of Si is annealed using annealing equipment in which a heating zone, a soaking zone and a cooling zone are arranged in this order from the upstream side.
  • a thickness gauge and a rapid heating device are arranged upstream of the soaking zone, and the following equation (1) is obtained from the thickness of the steel strip measured by the thickness gauge and the threading speed of the steel strip during annealing.
  • the heating temperature of the steel strip by the rapid heating device is determined from the defined LSD value.
  • the heating temperature of the steel strip by the rapid heating device in the above [1] is further added to the width of the steel strip, the furnace temperature of the heating zone after the rapid heating device, and the steel strip on the exit side of the heating strip. It can be determined from information on any one or more of the temperature, the furnace temperature of the soaking zone, and the steel strip temperature on the exit side of the soaking zone.
  • the rapid heating device can be installed upstream of the heating zone or in the front stage or middle stage in the heating zone.
  • the heating temperature of the steel strip by the rapid heating device can be determined by feeding back the furnace temperature of the heating zone after the rapid heating device.
  • the heating temperature of the steel strip by the rapid heating device can be determined so that the temperature of the steel strip on the heating strip exit side is constant.
  • the heating means of the rapid heating device may be any one or more of induction heating, electrical heating and infrared heating.
  • the steel strip heating temperature by the rapid heating device is set so that the larger the LSD value defined by the steel strip thickness ⁇ strip threading speed is, the higher the LSD value is, and the smaller the LSD is, the lower the heating temperature is set. It is possible to control the temperature of the steel strip on the side of the soaking zone and, by extension, the temperature of the steel strip on the exit side of the soaking zone to a predetermined target temperature with high accuracy. As a result, the magnetic properties of the product sheet are improved, which greatly contributes to reducing the occurrence of defects.
  • FIG. 1 is a schematic diagram showing the first half of a continuous annealing facility used for annealing hot-rolled steel strips for electrical steel sheets (hot-rolled sheet annealing), in which a heating zone, a soaking zone and a cooling zone are arranged from the upstream side.
  • the hot-rolled sheet annealing is performed by heating the steel strip S in the heating zone 3 so that the temperature of the steel strip on the exit side of the heating strip reaches the target soaking temperature, and then heating the steel strip S to the specified soaking temperature in the soaking zone 4. It is applied by holding for a time and then cooling in a cooling zone (not shown). At this time, the furnace temperatures of the heating zone 3 and the soaking zone 4 and the threading speed of the steel strip S are kept constant from the viewpoint of keeping the steel strip at a prescribed soaking temperature for a prescribed time.
  • the thickness of the steel strip has not a little variation, especially at the leading and trailing ends.
  • the strip threading speed may be changed suddenly during annealing of the steel strip.
  • the heating temperature of the steel strip cannot be heated to the target temperature only by controlling the furnace temperature of the heating zone and the soaking zone to a constant level.
  • a sudden change in the set furnace temperature causes overshoot and hunting not only in the furnace temperature but also in the steel strip temperature.
  • the hot-rolled steel strip is thicker and has a larger heat capacity than the cold-rolled steel strip. Since the furnace temperature of 3 is also affected, it is difficult to heat the steel strip to the target temperature. Therefore, in the heating strip 3, it is desirable to heat the strip so that the temperature of the strip on the exit side of the heating strip always reaches a predetermined target temperature regardless of variations in the thickness of the strip and the strip-threading speed.
  • the final purpose of the hot-rolled steel strip annealing is to perform a heat treatment in which the steel strip S is held at a target soaking temperature for a predetermined period of time in the soaking zone 4.
  • the heat quantity possessed by the steel strip will also differ. It becomes difficult to heat the hot-rolled steel strip to the target soaking temperature. In this sense as well, it is preferable to set the temperature of the steel strip on the delivery side of the rapid heating device 2 so that the temperature of the steel strip on the delivery side of the heating zone 3 is constant.
  • the present invention provides a plate thickness meter 5 and a rapid heating device on the upstream side of the heating zone 3 when hot-rolled steel strips for electrical steel sheets are subjected to hot-rolled sheet annealing using the continuous annealing facility shown in FIG.
  • the device 2 is arranged, and the rapid heating device is adjusted according to the value of LSD defined by the following formula (1) from the thickness of the steel strip measured by the thickness gauge 5 and the threading speed of the steel strip during annealing.
  • LSD is an index proportional to the heat capacity of the steel strip.
  • LSD t ⁇ LS (1)
  • t is the thickness (mm) of the steel strip
  • LS is the threading speed (m/min) of the steel strip.
  • the higher the LSD value of the hot-rolled steel strip the higher the heating temperature of the steel strip by the rapid heating device 2 is set.
  • Set the heating temperature low More specifically, the steel strip temperature at the delivery side of the rapid heating device, that is, the heating temperature by the rapid heating device 2, does not consider the LSD as the steel strip thickness increases, including minute variations in the thickness of the steel strip.
  • the heating temperature is set higher than the conventional heating temperature, and conversely, the thinner the plate thickness, the steel strip temperature at the delivery side of the rapid heating device, that is, the heating temperature by the rapid heating device 2, is set lower than the conventional heating temperature that does not consider LSD. to heat.
  • the steel strip temperature on the delivery side of the rapid heating device that is, the heating temperature by the rapid heating device 2 is set higher than the conventional heating temperature without considering LSD.
  • the steel strip temperature on the exit side of the rapid heating device 2 ie, the heating temperature by the rapid heating device 2 is set lower than the conventional heating temperature not considering LSD.
  • the temperature setting of the heating zone 3 can be changed without changing the furnace temperature setting of the heating zone. It is possible to control the temperature of the hot-rolled steel strip at the target soaking temperature with high accuracy by suppressing the fluctuation of the steel strip temperature in the soaking zone, and by extension, suppressing the fluctuation of the furnace temperature in the soaking zone.
  • the rapid heating device 2 may be of any type as long as it can heat and change the temperature of the steel strip with good responsiveness.
  • any of induction heating (solenoid method or transverse method), electric heating, near-infrared heating, etc., which have many achievements, can be suitably used.
  • the installation position of the rapid heating device 2 is to control the temperature of the steel strip on the exit side of the heating zone and, by extension, the temperature of the steel strip on the exit side of the soaking furnace with high accuracy, so it is set upstream of the soaking zone. As shown in FIG. 1, it may be upstream of the heating zone, and as shown in FIG.
  • an induction heating device particularly a solenoid type device
  • heating at a temperature higher than the Curie point is difficult. It is preferable to avoid the rear stage and use the front stage or the middle stage as the installation position.
  • the heating capacity of the rapid heating device 2 is as large as possible in order to cope with the large thickness of the hot-rolled steel strip and fluctuations in the strip-threading speed. As a guideline, it depends on the temperature range (position) where the rapid heating device is installed and the relationship between the "temperature and specific heat" of the steel strip, but the heating temperature of the steel strip with a thickness of about 2mm on the heating strip side should be about ⁇ 20°C. If a change is desired, if the rapid heating device 2 has a heating capacity (amount of temperature increase) of about 50 to 100° C., it is possible to sufficiently suppress variations.
  • the setting of the heating temperature of the steel strip by the rapid heating device 2 is changed according to the variation of the LSD value, that is, (thickness x strip threading speed), so that the heating temperature of the steel strip can be increased. It can sufficiently contribute to accuracy improvement.
  • the width of the hot-rolled steel strip S in addition to the value of the LSD. Since the heat capacity of the steel strip changes in proportion to the width of the steel strip, the amount of heat required for heating the steel strip and the amount of heat removed from the furnace body also change, and the This is because the furnace temperature in the soaking zone is also affected.
  • the furnace temperature information of the heating zones after the rapid heating device to the setting of the heating temperature of the rapid heating device 2 .
  • the heating capacity of the rapid heating device 2 is small, when the heat capacity of the steel strip changes greatly due to a change in the thickness of the hot rolled steel strip, a change in the strip threading speed, or a change in the LSD, only the rapid heating device Since there is a possibility that it may not be possible to cope with this, it is conceivable to dare to change the furnace temperature setting of the heating zone. Therefore, by feeding back constantly changing furnace temperature information after the rapid heating device 2 and reflecting it in the setting of the heating temperature of the rapid heating device 2, the steel strip temperature on the delivery side of the heating zone 3 can be controlled with higher accuracy. becomes possible.
  • the amount of increase in the steel strip temperature on the heating strip side can be calculated by the following formula (2).
  • ⁇ T amount of temperature rise [°C]
  • ⁇ Stefan-Boltzmann constant (4.88 ⁇ 10 ⁇ 8 [kcal/m 2 ⁇ h ⁇ K 4 ])
  • ⁇ CG Overall heat absorption rate
  • L Heating length [m]
  • C p Specific heat [kcal/kg°C]
  • ⁇ Density 7850 [kg/m 3 ]
  • V line speed [m/min]
  • t plate thickness [mm]
  • T f Furnace temperature [°C]
  • T s Entry-side steel plate temperature [°C]
  • the steel strip temperature on the hot strip side In order to control the steel strip temperature on the hot strip side with even higher accuracy, in addition to the LSD, the steel strip width, and the furnace temperature of the heating zone after the rapid heating device, the steel strip temperature on the hot strip side, Information on the furnace temperature of the soaking zone and the temperature of the steel strip on the exit side of the soaking zone is also preferably used to determine the heating temperature of the steel strip in the rapid heating device 2 .
  • the hot-rolled steel strip for electrical steel sheets targeted by the present invention contains Si in the range of 1.6 to 5.0 mass%. Since Si is an element effective in increasing the specific resistance of steel and reducing iron loss, it is preferably contained in an amount of 1.6 mass % or more. However, when Si exceeds 5.0 mass%, not only does the magnetic flux density decrease, but the steel becomes embrittled and cracks occur during cold rolling, resulting in a significant decrease in manufacturability. It is preferably in the range of 2.0 to 3.8 mass%.
  • the hot-rolled steel strip contains known inhibitor-forming components in order to develop secondary recrystallization, or to improve magnetic properties and mechanical properties. It may contain elements.
  • heat treatment can be performed uniformly and at an appropriate temperature over the entire length of the hot-rolled steel strip in the longitudinal direction (rolling direction). , it is possible to impart excellent magnetic properties over the entire length of the coil in the longitudinal direction without secondary recrystallization defects and crystal orientation defects.
  • a hot-rolled steel strip having a thickness of 1.4 to 2.8 mm and a width of 1200 mm is subjected to a soaking temperature using an annealing furnace 1 having a rapid heating device 2, a heating zone 3, and a soaking zone 4 shown in FIG.
  • Hot-rolled sheet annealing with a target value of 1050° C. was performed under the conditions shown in Table 1.
  • the steel strip threading speed is changed at 1/3 and 2/3 points in the longitudinal direction of the hot rolled steel strip, and the steel strip temperature at the exit side of the heating zone 3 and the The strip temperature was measured.
  • a solenoid type induction heating device is used as the rapid heating device 2, and the amount of change in the heating temperature of the steel strip by the rapid heating device is equal to the set thickness of the hot-rolled steel strip (set rolling thickness) x common.
  • LSDs is the value of the strip speed
  • LSDt is the value of the strip thickness actually measured by the strip thickness gauge 5 installed upstream of the rapid heating device x strip threading speed.
  • K was used.
  • the value of K is not a fixed value, but a value that varies depending on the thickness of the steel strip, heating characteristics such as specific heat, installation position of the rapid heating device, furnace temperature and heating length of the annealing furnace, etc.
  • the K values used in the examples are shown in Table 1.
  • the effect FT of the furnace temperature in the heating zone after the rapid heating device was obtained from the above equation (2), and this was added to the setting of the heating temperature on the delivery side of the rapid heating device.
  • the furnace temperature of annealing furnace 1 was adjusted between 800 and 1100°C.
  • the heating accuracy of each annealing condition is evaluated by dividing the hot-rolled steel strip into 20 sections in the longitudinal direction, obtaining the difference between the average steel strip temperature in each divided section and the target soaking temperature (1050 ° C.), The maximum value among them was evaluated.
  • the weight of the hot-rolled steel strip (coil) used in this example is about 20 tons, and the difference between the set thickness of the hot-rolled steel strip (set rolling thickness) and the measured thickness is The front and rear end portions were 200 ⁇ m at maximum, and the intermediate portion was 50 ⁇ m at maximum.
  • the technology of the present invention minimizes variations in the quality of product sheets by suppressing fluctuations in the temperature of the steel strip on the delivery side and controlling the annealing temperature (soaking temperature) of the steel strip to a predetermined temperature with high accuracy.
  • This technology is intended to be applied to not only hot-rolled steel strips for electrical steel sheets, but also all metal strips that require control of the annealing temperature.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Control Of Heat Treatment Processes (AREA)
PCT/JP2022/038751 2021-10-27 2022-10-18 熱延鋼帯の焼鈍方法 Ceased WO2023074467A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US18/693,688 US20240392403A1 (en) 2021-10-27 2022-10-18 Hot-rolled steel strip annealing method
CN202280071190.9A CN118139995A (zh) 2021-10-27 2022-10-18 热轧钢带的退火方法
EP22886795.8A EP4394056A4 (en) 2021-10-27 2022-10-18 Hot-rolled steel strip annealing method
JP2023513752A JP7558476B2 (ja) 2021-10-27 2022-10-18 熱延鋼帯の焼鈍方法
KR1020247017223A KR20240090874A (ko) 2021-10-27 2022-10-18 열연 강대의 어닐링 방법

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JP2021175709 2021-10-27
JP2021-175709 2021-10-27

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JPS61201735A (ja) * 1985-03-05 1986-09-06 Kawasaki Steel Corp 鋼帯の連続焼鈍方法および装置
JP2004197144A (ja) * 2002-12-17 2004-07-15 Jfe Steel Kk 連続焼準板温制御方法
CN201265027Y (zh) * 2008-09-18 2009-07-01 鞍钢股份有限公司 热轧板直接通电加热退火装置
CN101684514A (zh) * 2008-09-27 2010-03-31 鞍钢股份有限公司 一种高效冷轧电工钢产品的制造方法
JP2011179035A (ja) * 2010-02-26 2011-09-15 Jfe Steel Corp 連続焼鈍炉の板温制御方法及び連続焼鈍炉
JP2016000856A (ja) 2014-05-19 2016-01-07 Ｊｆｅスチール株式会社 方向性電磁鋼板の製造方法
JP2018066040A (ja) 2016-10-19 2018-04-26 Ｊｆｅスチール株式会社 Ｓｉ含有熱延鋼板の熱延板焼鈍設備、熱延板焼鈍方法および脱スケール方法

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