WO2023042795A1 - 焼入れ装置及び連続焼鈍設備、並びに焼入れ方法、鋼板の製造方法及びめっき鋼板の製造方法 - Google Patents

焼入れ装置及び連続焼鈍設備、並びに焼入れ方法、鋼板の製造方法及びめっき鋼板の製造方法 Download PDF

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Publication number
WO2023042795A1
WO2023042795A1 PCT/JP2022/034061 JP2022034061W WO2023042795A1 WO 2023042795 A1 WO2023042795 A1 WO 2023042795A1 JP 2022034061 W JP2022034061 W JP 2022034061W WO 2023042795 A1 WO2023042795 A1 WO 2023042795A1
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Prior art keywords
metal plate
quenching
shape
cooling
roll
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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
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PCT/JP2022/034061
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English (en)
French (fr)
Japanese (ja)
Inventor
宗司 吉本
弘和 小林
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JFE Steel Corp
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JFE Steel Corp
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Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to CN202280060373.0A priority Critical patent/CN117940590A/zh
Priority to MX2024002968A priority patent/MX2024002968A/es
Priority to KR1020247007664A priority patent/KR20240046537A/ko
Priority to EP22869942.7A priority patent/EP4365321A4/en
Priority to US18/689,954 priority patent/US20250129445A1/en
Priority to JP2022573501A priority patent/JP7537521B2/ja
Publication of WO2023042795A1 publication Critical patent/WO2023042795A1/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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C21D9/0012—Rolls; Roll arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
    • 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
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/58—Oils
    • 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
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/60—Aqueous agents
    • 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
    • C21D1/62—Quenching devices
    • C21D1/63—Quenching devices for bath quenching
    • 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
    • C21D1/62—Quenching devices
    • C21D1/63—Quenching devices for bath quenching
    • C21D1/64—Quenching devices for bath quenching with circulating liquids
    • 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
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching
    • 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
    • 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
    • C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
    • 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
    • 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
    • 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
    • C21D9/5735—Details
    • C21D9/5737—Rolls; Drums; Roll arrangements
    • 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
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • 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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • 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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/28—Measuring arrangements characterised by the use of mechanical techniques for measuring roughness or irregularity of surfaces
    • G01B5/285—Measuring arrangements characterised by the use of mechanical techniques for measuring roughness or irregularity of surfaces for controlling eveness

Definitions

  • the present invention relates to a quenching apparatus and continuous annealing equipment for performing quenching while continuously passing a metal sheet, a quenching method, a steel sheet manufacturing method, and a plated steel sheet manufacturing method.
  • the technology to rapidly cool the steel sheets is important.
  • one of the fastest cooling techniques is water quenching.
  • the steel sheet is quenched by immersing the heated steel sheet in water and simultaneously spraying cooling water onto the steel sheet from a quench nozzle provided in the water.
  • a quench nozzle provided in the water.
  • Patent Document 1 discloses a structure in which cooling water injection nozzles are installed in multiple stages in immersion water for water-cooling a heated strip, and each nozzle header is spaced apart from each other in the direction of strip travel. .
  • cooling water injection nozzles are installed in multiple stages in immersion water for water-cooling a heated strip, and each nozzle header is spaced apart from each other in the direction of strip travel. .
  • a bridle roll is used as a tension changing means capable of changing the tension of the steel plate subjected to the quenching process in order to suppress the wavy deformation of the metal plate that occurs during quenching in a continuous annealing furnace.
  • a method of providing the front and back is disclosed.
  • Patent Document 1 has a problem that the shape correction effect is insufficient when the metal plate has already warped before quenching.
  • the method disclosed in Patent Document 2 since a large tension is applied to the high-temperature metal plate, there is a possibility that the metal plate may break.
  • a large thermal crown occurs in the bridle roll before the quenching part that contacts the high-temperature metal plate, and the bridle roll and the metal plate contact unevenly in the width direction, resulting in buckling and scratches on the metal plate. is generated, there is a problem that the shape of the metal plate cannot be improved.
  • An object of the present invention is to provide an annealing facility, a quenching method, a steel sheet manufacturing method, and a plated steel sheet manufacturing method.
  • a quenching device for cooling a metal plate comprising: a cooling device for quenching the metal plate by cooling it with a cooling fluid;
  • a quenching apparatus comprising: a shape correction roll that pushes the metal plate before quenching in the thickness direction of , and a pushing control device that sets the amount of pushing of the shape correction roll based on the shape of the metal plate before quenching.
  • the pushing control device pushes the shape correction roll on the front side of the metal plate so that the metal plate before quenching is warped on the back side.
  • the quenching apparatus wherein the quenching apparatus is controlled to push in the shape correction roll on the back surface side of the metal plate when the warp shape is convex on the side.
  • the shape measuring device has a function of measuring the warp amount of the metal plate, and the pushing control device sets the measured warp amount of the metal plate as a pushing amount to push the shape correction roll.
  • the quenching device which is controlled to [5]
  • the shape straightening rolls on the front side and the back side are installed with a center axis distance of 100 mm or more and 1000 mm or less, and the distance between the cooling start point of the cooling device and the shape straightening roll is 500 mm or less.
  • the hardening apparatus according to any one of [1] to [4].
  • [6] A continuous annealing facility equipped with the quenching device according to any one of [1] to [5] on the outlet side of the soaking zone.
  • the metal plate is pushed in the thickness direction, if the metal plate before quenching has a convex warped shape on the surface side, the shape correction roll on the surface side of the metal plate is pushed in, and the above-mentioned before quenching is performed.
  • the metal plate before quenching is pushed in the thickness direction according to the shape of the metal plate. As a result, even if the metal plate before quenching is warped when the metal plate is quenched while being continuously fed, the warping of the metal plate after quenching can be suppressed.
  • FIG. 4 is a schematic diagram showing how a shape correction roll pushes a metal plate.
  • FIG. 4 is a schematic diagram showing how a shape correction roll pushes a metal plate. It is a schematic diagram which shows an example of the definition of the curvature amount of a metal plate.
  • FIG. 1 is a schematic diagram showing an example of a hardening apparatus according to an embodiment of the present invention.
  • the quenching apparatus 1 of FIG. 1 performs quenching of a steel material as, for example, a metal plate S, and is applied to a cooling facility provided on the exit side of a soaking zone of continuous annealing equipment such as a continuous annealing furnace.
  • the hardening apparatus 1 of FIG. 1 includes a cooling device 10 that cools the metal plate S.
  • the cooling device 10 cools a metal plate using a coolant CF, and is installed in a cooling bath 11 that stores the coolant CF, and is installed in the cooling bath 11 to inject the coolant CF onto the front and back surfaces of the metal plate S. and a plurality of ejection nozzles 12 .
  • Water is stored in the cooling tank 11 as a coolant CF, and for example, the metal plate S is immersed from the upper surface of the cooling tank 11 in the direction of sheet feeding.
  • the coolant CF in the cooling bath 11 is maintained at a water temperature suitable for quenching.
  • the water temperature in the cooling bath 11 is preferably higher than 0°C and 50°C or lower, and particularly preferably 10°C or higher and 40°C or lower.
  • the cooled refrigerant CF is returned to the cooling tank 11, so that the water temperature in the cooling tank 11 Rise is prevented.
  • a sink roll 2 is installed in the cooling tank 11 to change the passing direction of the metal plate S. As shown in FIG. Further, the plate threading direction is the direction in which the metal plate S is conveyed.
  • a plurality of ejection nozzles 12 are installed along the direction in which the metal plate S is passed on each of the two surface sides of the metal plate.
  • the ejection nozzles 12 are desirably arranged symmetrically on the front side and the back side of the metal plate S, respectively, and slit nozzles are preferable in order to obtain a more uniform cooling capacity in the width direction. Therefore, the metal plate S is cooled by the coolant CF in the cooling tank 11 and the coolant CF ejected from the plurality of ejection nozzles 12 .
  • FIG. 1 illustrates a case where the cooling device 10 includes the cooling bath 11 and a plurality of jet nozzles 12. may be cooled with Furthermore, the cooling device 10 may cool the metal plate S by, for example, mist, nozzle-only water injection cooling, or gas cooling. Moreover, although the case of water quenching using water as the coolant CF is illustrated, oil cooling using oil as the coolant CF may be used.
  • the fluid stored in the cooling bath 11 and ejected from the ejection nozzle 12 may be a cooling fluid, for example, the refrigerant CF.
  • FIG. 1 illustrates a case in which a plurality of jet nozzles 12 are installed in the cooling bath 11, but if the method can cool the metal plate S within a desired temperature range, this cooling method can be used. Not limited.
  • the warp may remain in the metal plate S after quenching.
  • the warp may become worse. Therefore, it is desirable to suppress the occurrence of warping of the metal sheet S before quenching, and furthermore, it is desirable to correct the warping of the metal sheet S before quenching by quenching. Therefore, in the quenching apparatus 1 of FIG. 1, the shape of the metal plate S before quenching is pushed in according to the shape of the metal plate S before quenching, and the shape of the metal plate S is corrected.
  • the "shape" of the metal plate S includes "warp direction" and "warp amount”.
  • the "warp direction” is the same as the "convex warp shape" in the metal plate S.
  • the method for grasping the shape of the metal plate S before quenching is not particularly limited as long as the method can grasp the warp direction and warp amount of the metal plate S.
  • the shape of the metal plate S before quenching is based on the shape measured at an arbitrary position on the passage of the metal plate S before quenching, and the annealing conditions of the metal plate S until just before quenching and the transport conditions of the metal plate S are added. may be calculated using a physical model.
  • the shape of the metal plate S before quenching may be predicted using a prediction model using a machine learning model.
  • a shape measuring device may be provided immediately before quenching to measure the shape of the metal plate S.
  • the shape of the subsequent material before quenching may be estimated based on the "warp direction" and "warp amount” in the measurement of the shape of the metal plate S (preceding material) after quenching. Specifically, when the measured warpage amount of the metal plate S (previous material) after quenching is larger than the average value of the past production results (warpage amount after quenching), the warpage that existed before quenching has an effect. Then, the warp amount and warp direction of the metal plate S (subsequent material) before quenching may be estimated. Then, the direction and amount of pressing by the shape correction rolls may be adjusted for the estimated succeeding material.
  • the push amounts of the back side pushing roll 30a and the front side pushing roll 30b can be determined based on the warp amount, as described later. If it is not possible to quantitatively grasp the warp amount of the metal plate S before quenching, the amount of pushing by the back side pushing roll 30a and the front side pushing roll 30b as past production results, and the quenching corresponding to the pushing amount
  • the pressing amounts of the back side pressing roll 30a and the front side pressing roll 30b may be determined based on the data of the amount of warp (flattened shape) of the metal plate S afterward.
  • the warp direction of the metal sheet S before quenching tends to reflect the shape of the original sheet on the entry side of the continuous annealing furnace.
  • the pushing direction and pushing amount may be adjusted.
  • the quenching apparatus 1 of FIG. 1 includes a shape measuring device 20 having a function of measuring the shape of the metal plate before quenching, a shape correction roll 30, and based on the shape of the metal plate S measured by the shape measuring device 20, A pushing control device 40 for controlling pushing of the shape correction roll 30 is provided.
  • the shape measuring device 20 comprises, for example, a shape measuring roll, and specifically, a product called BFI shape roll from Volmer can be used.
  • a plurality of piezoelectric sensors are provided in the shape measuring device 20 along the width direction, and the shape of the metal plate S can be measured by passing the metal plate S over the shape measuring device 20 .
  • the shape measuring device 20 measures the warp direction of the metal plate S before quenching as the shape of the metal plate S, and preferably measures the warp direction and the warp amount.
  • FIG. 1 exemplifies the case where the shape measuring device 20 consists of a shape measuring roll, but is not limited to this. may be measured.
  • FIG. 2 and 3 are schematic diagrams showing how the shape correction roll 30 pushes the metal plate S.
  • the shape correction roll 30 includes a back side pressing roll 30a for pressing the metal plate S from the back side, and a front side pressing roll 30b for pressing the metal plate S from the front side.
  • the back side pressing roll 30a and the front side pressing roll 30b are arranged in a zigzag manner along the sheet threading direction.
  • the back side pressing roll 30a and the front side pressing roll 30b are made of a material that has excellent thermal conductivity and is strong enough to withstand the load when the metal plate S is pressed. Examples of materials for the back side pressing roll 30a and the front side pressing roll 30b include SUS304, SUS310, ceramics, etc. specified in Japanese Industrial Standard JIS G4304 "Hot Rolled Stainless Steel Plates and Strips".
  • the center axis distance L between the back side pressing roll 30a and the front side pressing roll 30b is preferably set so that they do not come into contact with each other during pressing. preferable. If the distance between the center axes is less than 100 mm, there is a concern that the metal sheet S may be jammed by the pressing and may not be threaded. On the other hand, if the distance L between center axes exceeds 1000 mm, the binding force cannot be obtained and warpage remains even after quenching.
  • the distance between the center position of the front side pressing roll 30b arranged closer to the cooling device 10 and the cooling start point SP is preferably within 500 mm. This is because if the shape correction position of the metal sheet S is too far from the cooling start point SP at which the martensite transformation temperature is reached, the effect of suppressing out-of-plane deformation during cooling is reduced. Furthermore, in consideration of interference with cooling equipment, it is preferable that the cooling start point is separated by 50 mm or more. Further, the diameters of the back side pressing roll 30a and the front side pressing roll 30b are not particularly limited, but from the viewpoint of maintenance and operation costs, the diameter is preferably 100 mm or more and 500 mm or less. Also when predicting the shape of the metal plate S, it is preferable to predict the shape of the metal plate S at a position as close as possible to the cooling start point SP.
  • the back side pressing roll 30a and the front side pressing roll 30b are installed so as to be movable in the thickness direction of the metal plate S.
  • the pushing direction and pushing amount of the back side pushing roll 30a and the front side pushing roll 30b are controlled by the pushing control device 40.
  • the back side pressing roll 30a and the front side pressing roll 30b are preferably electrically rotated in the circumferential direction in order to prevent the occurrence of roll flaws in the metal plate S.
  • the pressing control device 40 in FIG. 1 controls the pressing amount of the metal plate S by the back side pressing roll 30a and the front side pressing roll 30b according to the warp direction of the metal plate S.
  • the pressing control device 40 controls the amount of pressing so that the surface side pressing roll (back side pressing roll 30 a or front side pressing roll 30 b ) having a convex warp shape is pressed into the metal plate S.
  • the pushing control device 40 pushes the front side pushing roll 30b into the metal plate S.
  • the pushing control device 40 pushes the back side pushing roll 30a into the metal plate S.
  • FIG. 4 is a schematic diagram showing the definition of the amount of warpage d.
  • the pushing control device 40 preferably controls the pushing amounts of the back side pushing roll 30a and the front side pushing roll 30b according to the warp amount d.
  • the pressing amounts of the back side pressing roll 30a and the front side pressing roll 30b are set based on the case where the metal sheet S is linearly passed (0 mm). Therefore, as the amount of warp d of the metal plate S increases, the amount of pressing also increases.
  • the shape of the metal plate S before quenching such as the warp direction and the warp amount d
  • the shape correction roll 30 is pushed in the thickness direction of the metal plate S in accordance with the warp direction of the metal plate S.
  • the front side pressing roll 30b is pushed into the metal plate S as shown in FIG.
  • the back pressing roll 30a is pressed into the metal plate S as shown in FIG.
  • the pushing amount Pd is set to be the same as the warp amount d.
  • the metal plate S is cooled by the cooling device 10 and quenched.
  • the shape of the metal plate S before quenching is grasped, and the shape correction roll 30 is pushed in the thickness direction of the metal plate S according to the shape of the metal plate S.
  • the warping of the metal plate after quenching can be suppressed.
  • the warping will become even greater after quenching.
  • the bending moment that acts on the metal plate due to quenching acts in a direction that promotes the warp, if the metal plate is already warped before quenching, because there is resistance in the direction of restoring the warp. Therefore, the direction of warping of the metal plate before quenching is the same as the direction of warping of the metal plate after quenching, and the amount of warping is greater than before quenching.
  • the present invention can reduce the complex and non-uniform uneven shape that occurs when the structure expands in volume due to martensitic transformation during rapid cooling of the metal sheet S. Therefore, when the metal plate S is a high-strength steel plate (high-tensile steel), the effect of suppressing deformation is increased.
  • the hardening apparatus 1 is preferably applied to hardening when the metal plate S is a high-strength steel plate. More specifically, it is preferably applied to the production of steel sheets having a tensile strength of 580 MPa or more. Although the upper limit of the tensile strength is not particularly limited, it may be 2000 MPa or less as an example.
  • high-strength steel sheets include high-strength cold-rolled steel sheets, hot-dip galvanized steel sheets (hot-dip galvanized steel sheets) obtained by subjecting them to surface treatment (plating), and electrogalvanized steel sheets (electro-galvanized steel sheets). steel sheet), alloyed hot-dip galvanized steel sheet (alloyed hot-dip galvanized steel sheet), etc.
  • C is 0.04% or more and 0.35% or less
  • Si is 0.01% or more and 2.50% or less
  • Mn 0.80% or more and 3.70%.
  • the embodiment of the present invention is not limited to the example of quenching a steel plate, and can be applied to the quenching of metal plates in general other than steel plates.
  • Examples 1 to 14 of the present invention high-strength cold-rolled steel sheets having a thickness of 1.0 mm and a width of 1000 mm and a tensile strength of 1470 MPa class were produced as metal sheets S using the quenching apparatus 1 of FIG.
  • the composition of the high-tensile cold-rolled steel sheet with a tensile strength of 1470 MPa is, in mass%, C 0.20%, Si 1.0%, Mn 2.3%, P 0.005%, S is 0.002%. Water was used as the coolant CF, and the temperature of the water was set at 30°C.
  • Comparative Examples 1 to 6 the above-mentioned high-strength cold-rolled steel sheets were produced using the quenching apparatus shown in Patent Document 1 under the same conditions as in the Examples of the present invention.
  • the diameter of the shape correcting roll was 100 mm in both devices.
  • the relationship between the warp amount of the metal plate S before quenching and the warp amount of the metal plate S after quenching was measured.
  • the "warp direction” and "warp amount” of the metal plate S before quenching were not measured, but the "warp direction” and "warp amount” before quenching were estimated.
  • the definition of the amount of warpage d is shown in FIG.
  • Example 10 of the present invention when the center axis distance is greater than 1000 mm, the warpage of the metal sheet S before quenching is corrected, but the warpage remains in the steel sheet after quenching compared to the case where the distance is 1000 mm or less. end up
  • Example 6 of the present invention when the distance between the shape correction roll 30 (front side pressing roll 30b) and the cooling start point SP is larger than 500 mm, the warp of the metal plate S before quenching is corrected, but the distance is 500 mm. Warpage remains in the steel plate after quenching compared to the following cases.
  • Comparative Examples 1 to 6 when the steel plate S before quenching already had warpage, the warpage of the metal plate S after quenching increased.
  • the shape of the metal plate S (following material) before quenching was estimated by visually confirming the direction and amount of warping of the metal plate S (preceding material) after quenching on the camera screen. bottom.
  • the amount of warpage of the metal plate S (preceding material) after quenching is measured using an image taken from the edge side (both sides in the width direction) of the metal plate S, and the position where the amount of warpage is maximized. It was detected by image analysis and measured by fitting it to the actual scale. Then, when the measured warpage amount was larger than the average value of past production results (warpage amount after quenching), it was determined that the shape of the metal sheet S before quenching had warpage.
  • the amount of warp before quenching was estimated from the difference between the average value of the past production results (the amount of warp after quenching) and the measured amount of warp. Therefore, the production results are collected in advance, and the correlation between the difference between the average value of the production results (warpage amount after quenching) and the measured warpage amount, and the warpage amount before quenching is grasped in advance. is preferred.
  • the warp direction of the metal plate S (following material) was estimated based on the warp direction of the metal plate S (preceding material), assuming that the warping direction of the metal plate S before and after quenching is the same.
  • the allowable range of the amount of warp on one side (front side or back side) of the metal plate S is limited due to the convenience of the facilities of the sheet threading route. It is also possible to adjust the warp direction, such as changing the warp direction to the other surface (back surface or front surface) when the width is narrow.

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PCT/JP2022/034061 2021-09-16 2022-09-12 焼入れ装置及び連続焼鈍設備、並びに焼入れ方法、鋼板の製造方法及びめっき鋼板の製造方法 Ceased WO2023042795A1 (ja)

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CN202280060373.0A CN117940590A (zh) 2021-09-16 2022-09-12 淬火装置及连续退火设备、以及淬火方法、钢板的制造方法及镀覆钢板的制造方法
MX2024002968A MX2024002968A (es) 2021-09-16 2022-09-12 Aparato de enfriamiento, instalacion de recocido continuo, metodo de enfriamiento, metodo para fabricar laminas de acero y metodo para fabricar laminas de acero recubiertas.
KR1020247007664A KR20240046537A (ko) 2021-09-16 2022-09-12 ??칭 장치 및 연속 어닐링 설비, 그리고 ??칭 방법, 강판의 제조 방법 및 도금 강판의 제조 방법
EP22869942.7A EP4365321A4 (en) 2021-09-16 2022-09-12 QUENCHING APPARATUS, CONTINUOUS ANNEALING PLANT, QUENCHING METHOD, STEEL SHEET PRODUCTION METHOD, AND PLATED STEEL SHEET PRODUCTION METHOD
US18/689,954 US20250129445A1 (en) 2021-09-16 2022-09-12 Quenching apparatus, continuous annealing facility, quenching method, method for manufacturing steel sheet, and method for manufacturing coated steel sheet
JP2022573501A JP7537521B2 (ja) 2021-09-16 2022-09-12 焼入れ装置及び連続焼鈍設備、並びに焼入れ方法、鋼板の製造方法及びめっき鋼板の製造方法

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JPS57164934A (en) * 1981-03-31 1982-10-09 Sumitomo Metal Ind Ltd Heat treatment for steel plate
JPS59153843A (ja) 1983-02-18 1984-09-01 Nippon Kokan Kk <Nkk> ストリップの冷却装置
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