WO2023026774A1 - Appareil de durcissement par trempe, procédé de durcissement par trempe et procédé de fabrication feuille métallique - Google Patents

Appareil de durcissement par trempe, procédé de durcissement par trempe et procédé de fabrication feuille métallique Download PDF

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WO2023026774A1
WO2023026774A1 PCT/JP2022/029365 JP2022029365W WO2023026774A1 WO 2023026774 A1 WO2023026774 A1 WO 2023026774A1 JP 2022029365 W JP2022029365 W JP 2022029365W WO 2023026774 A1 WO2023026774 A1 WO 2023026774A1
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Prior art keywords
cooling
metal plate
fluid
temperature
tank
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PCT/JP2022/029365
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English (en)
Japanese (ja)
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宗司 吉本
弘和 小林
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Ｊｆｅスチール株式会社
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Priority to MX2024002108A priority Critical patent/MX2024002108A/es
Priority to EP22861065.5A priority patent/EP4372106A1/fr
Priority to JP2022559510A priority patent/JP7508024B2/ja
Priority to CN202280055845.3A priority patent/CN117836436A/zh
Priority to KR1020247004916A priority patent/KR20240035543A/ko
Publication of WO2023026774A1 publication Critical patent/WO2023026774A1/fr

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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
    • C21D9/52—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D1/667—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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • 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
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/22—Electroplating: Baths therefor from solutions of zinc
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite
    • 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
    • C22C38/38—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

Definitions

  • the present invention relates to a quenching apparatus, a quenching method, and a method of manufacturing a metal plate that perform annealing while continuously conveying the metal plate.
  • a water quenching method is known as one of the techniques with the fastest cooling rate for a metal plate. In the water quenching method, a heated metal plate is immersed in water and at the same time cooling water is sprayed onto the metal plate from a quench nozzle provided in the water, thereby quenching the metal plate.
  • Patent Documents 1 and 2 various methods have been proposed to prevent shape defects of metal plates during quenching (see Patent Documents 1 and 2, for example).
  • Patent Document 1 when the temperature at the Ms point where the martensitic transformation of the metal plate starts is TMs (°C) and the temperature at the Mf point where the martensitic transformation ends is TMf (°C), the temperature of the metal plate is (
  • a method has been proposed in which a metal plate is constrained by a pair of constraining rolls provided in a cooling liquid in the range of TMs+150) (°C) to (TMf-150) (°C).
  • Patent Document 2 when performing a quenching method in which water is jetted from a plurality of water jet nozzles onto the surface of a metal plate to cool it, the metal plate is restrained by restraint rolls, and the metal plate is cooled by a cooling fluid using a movable mask. It is disclosed to control the distance between the cooling start position and the constraining roll.
  • the present invention has been made to solve such problems, and provides a quenching apparatus, a quenching method, and a method of manufacturing a metal plate product that can suppress variations in the shape of a metal plate that occur during quenching. for the purpose.
  • a metal plate quenching apparatus that cools a metal plate while it is conveyed, comprising: a cooling tank in which a cooling fluid is stored and the metal plate is immersed and cooled; a constraining roll that conveys the metal plate cooled by by constraining it in the thickness direction, and a water level adjuster that adjusts the height of the fluid surface of the cooling fluid in the cooling tank, which is the cooling start position of the metal plate and a position control device for controlling the height of the fluid surface of the cooling fluid in the cooling tank by controlling the operation of the water level adjuster.
  • the apparatus for quenching a metal plate according to [1] further comprising a plurality of nozzles installed in the cooling tank for cooling the metal plate by injecting the cooling fluid.
  • the water level adjuster stores the cooling fluid, and controls an adjustment tank connected to the cooling tank, a supply source to the adjustment tank, and discharge of the cooling fluid from the adjustment tank.
  • the weir according to [1] or [2], wherein the height of the fluid surface of the cooling fluid in the cooling tank is adjusted by adjusting the storage amount of the cooling fluid in the adjustment tank. Quenching equipment for metal plates.
  • the position control device adjusts the height of the fluid surface of the cooling fluid in the cooling tank so that the constraining roll constrains the metal plate at a position where the metal plate reaches the target temperature.
  • the apparatus for hardening a metal plate according to any one of [3].
  • the target temperature is (TMs+150), where TMs (° C.) is the temperature at the Ms point where the martensitic transformation of the metal plate starts, and TMf (° C.) is the temperature at the Mf point where the martensitic transformation ends. (° C.) to (TMf-150) (° C.).
  • the position control device controls the distance from the cooling start position to the restraint roll, the conveying speed of the metal plate, the cooling start temperature of the metal plate at the start of cooling by the cooling tank, and the target temperature. and the cooling rate of the metal plate, and adjust the height of the fluid surface of the cooling fluid in the cooling tank so that the set distance is reached.
  • the metal according to [4] or [5] Plate quenching equipment.
  • the position control device has a conveying speed of the metal plate of v (mm/s), a cooling start temperature of T1 (°C), a target temperature of T2 (°C), and cooling of the metal plate by the cooling bath.
  • the target temperature is (TMs + 150), where TMs (°C) is the temperature at the Ms point where the martensitic transformation of the metal plate starts, and TMf (°C) is the temperature at the Mf point where the martensitic transformation ends. (° C.) to (TMf-150) (° C.).
  • the height of the fluid surface of the cooling fluid is adjusted according to the conveying speed of the metal plate, the cooling start temperature of the metal plate at the start of cooling, the target temperature, and the cooling speed of the metal plate.
  • the distance from the cooling start position to the constraining roll is set, and the height of the fluid surface of the cooling fluid in the cooling tank is adjusted so as to achieve the set distance.
  • a method of quenching a metal plate [13] The distance from the cooling start position of the cooling tank to the constraining roll is v (mm/s) for the conveying speed of the metal plate, T1 (°C) for the cooling start temperature, and T2 (°C) for the target temperature. , where the cooling rate of the metal plate is CV (° C./s), the distance d (mm) from the cooling start position to the restraint roll is obtained by formula (1).
  • the cooling start position is restrained. You can control the distance to the roll. As a result, variations in the shape of the metal plate that occur during quenching can be suppressed.
  • FIG. 2 is a schematic diagram showing an example of the water level adjuster of FIG. 1; It is a schematic diagram which shows an example of the definition of the curvature amount of a metal plate. It is a graph which shows the relationship between the conveyance speed and target temperature in the example of this invention. It is a graph which shows the relationship between the conveyance speed and the curvature amount of a metal plate in the example of this invention.
  • 7 is a graph showing the relationship between the conveying speed and the target temperature in Comparative Example 1.
  • FIG. 7 is a graph showing the relationship between the conveying speed and the warp amount of the metal plate in Comparative Example 1.
  • FIG. 9 is a graph showing the relationship between the conveying speed and the target temperature in Comparative Example 2.
  • FIG. 9 is a graph showing the relationship between the conveying speed and the amount of warpage of the metal plate in Comparative Example 2.
  • FIG. 1 is a schematic diagram showing a hardening apparatus according to an embodiment of the present invention.
  • the quenching apparatus 1 shown in FIG. 1 is for quenching a steel material, for example, as a metal sheet S, and is applied to a cooling facility provided on the delivery side of a soaking zone of a continuous annealing furnace.
  • a metal plate quenching apparatus 1 shown in FIG. 1 includes a cooling device 10 that cools a metal plate S, and restraint rolls 20 that restrain the cooled metal plate S in the thickness direction.
  • the cooling device 10 cools the metal plate S using the cooling fluid CF. and a plurality of nozzles 12 for jetting. Water is stored in the cooling tank 11 as a cooling fluid CF.
  • the metal plate S is immersed from the upper surface of the cooling tank 11 in the transport direction BD.
  • a sink roll 2 for changing the conveying direction of the metal plate S is installed in the cooling tank 11 .
  • the plurality of nozzles 12 are, for example, slit nozzles or the like, and are installed on both sides of the metal plate S along the conveying direction of the metal plate S. Therefore, the metal plate S is cooled by the cooling fluid CF in the cooling tank 11 and the cooling fluid CF jetted from the plurality of nozzles 12 .
  • the cooling fluid CF in the cooling tank 11 By cooling the metal plate S using both the cooling bath 11 and the plurality of nozzles 12 in this manner, the boiling state of the surface of the metal plate S is stabilized, and uniform shape control can be performed.
  • FIG. 1 illustrates a case where a plurality of nozzles 12 are installed in the cooling tank 11, but if the method can cool the metal plate S within a preset temperature range, this cooling method can be used. Not limited. For example, the metal plate S may be cooled only by the cooling bath 11 without using the nozzle 12 .
  • the constraining rolls 20 constrain the metal plate S cooled by the cooling device 10 in the thickness direction, and are fixed to both surfaces of the metal plate S in the cooling tank 11 .
  • a pair of restraint rolls 20 are installed so as to face each other, but they may be installed at positions shifted along the conveying direction as long as they restrain.
  • FIG. 1 illustrates a case where one pair of restraint rolls 20 is installed, the number of restraint rolls 20 is not limited to one pair, and a plurality of pairs or a plurality of rolls may be provided. In that case, the entire binding roll pair may be collectively position-controlled.
  • the quenching of the metal plate S is performed by immersing the metal plate S in the cooling fluid CF stored in the cooling bath 11 . Therefore, the cooling start position SP of the metal plate S varies depending on the water level of the cooling tank 11. FIG. Therefore, the metal quenching apparatus 1 has a function of changing the cooling start position SP by changing the height of the fluid surface of the cooling bath 11 .
  • the metal quenching device 1 includes a water level adjuster 30 that adjusts the height of the cooling fluid CF contained in the cooling bath 11 and a position control device 40 that controls the operation of the water level adjuster 30 .
  • FIG. 2 is a schematic diagram showing an example of the water level regulator 30 of FIG.
  • the water level regulator 30 of FIG. 2 includes an adjustment tank 31 that stores the cooling fluid CF, a supply source 32 that supplies the cooling fluid CF to the adjustment tank 31, and a weir 33 that controls discharge of the cooling fluid CF from the adjustment tank 31. and
  • the adjustment bath 31 and the cooling bath 11 are connected by a discharge pipe 34 through which the cooling fluid CF is discharged from the cooling bath 11 and a supply pipe 35 through which the cooling fluid CF is supplied to the cooling bath 11 .
  • the discharge pipe 34 and the supply pipe 35 are provided below the liquid surface.
  • the discharge pipe 34 and the supply pipe 35 may be integrated.
  • the heights of the fluid surfaces of the adjustment tank 31 and the cooling tank 11 are adjusted by the movement of the fluid through the discharge pipe 34 and the supply pipe 35 so that they are the same due to the atmospheric pressure. Therefore, the height of the fluid level of the cooling tank 11 can be adjusted by adjusting the storage amount of the adjustment tank 31 while monitoring the height of the fluid level of the adjustment tank 31, for example. In addition, this makes it possible to adjust the cooling start position SP. Specifically, when the cooling start position SP is raised, the cooling fluid CP is supplied from the supply source 32 into the adjustment tank 31 to increase the storage amount. Along with this, the height of the liquid surface in the cooling tank 11, that is, the cooling start position SP increases.
  • the weir 33 is moved, that is, the weir 33 is lowered, and the cooling fluid CP in the adjustment tank 31 overflows from the weir 33, causing the cooling fluid CP to flow out of the adjustment tank 31. Ejected. Along with this, the height of the liquid surface in the cooling bath 11, that is, the cooling start position SP is lowered.
  • the water level adjuster 30 is not limited to the configuration of FIG.
  • the height of the liquid surface may be adjusted by immersing or removing the object.
  • the cooling tank 11 is connected to the adjustment tank 31 for adjustment. It is preferable to adjust the liquid level of the cooling bath 11 by adjusting the storage volume of the bath 31 .
  • the position control device 40 consists of hardware resources such as a computer, and controls the water level adjuster 30 to control the height of the fluid surface of the cooling fluid CF in the cooling tank 11 .
  • the position control device 40 controls the operation of the water level adjuster 30, and adjusts the height of the fluid surface of the cooling fluid CF in the cooling tank 11 so that the metal plate S is constrained at the position RP where the target temperature is reached. adjust.
  • the target temperature is defined as (TMs+150)( ° C.) to (TMf-150) (° C.).
  • the deformation of the metal plate S can be restrained by the restraining rolls 20 at the position where the metal plate S undergoes rapid thermal contraction and transformation expansion at the same time, and deformation of the metal plate S during quenching can be restrained. can.
  • the position control device 40 calculates the distance d from the target cooling start position SP of the metal plate S by the cooling fluid CF to the position RP at which the target temperature is reached, and controls the cooling fluid in the cooling tank 11 based on the calculated distance d. Adjust the height of the CF fluid surface. At this time, the position control device 40 controls the conveying speed v (mm/s) of the metal plate S, the cooling start temperature T1 (°C), the target temperature T2 (°C), the cooling speed CV (°C) of the metal plate S by the cooling device 10, /s) to calculate the distance d.
  • the above parameters may be obtained sequentially from the set values of the process computer or actual operation values, or may be measured using a speed sensor, temperature sensor, or the like.
  • the cooling start temperature T1 (° C.) means the temperature at which cooling of the metal plate S is started, specifically the temperature of the metal plate S immediately before the cooling start position SP.
  • the temperature of the metal plate S immediately before reaching the cooling start position SP can be calculated based on the cooling state of the metal plate S up to the cooling start position SP and the hardening device 1 .
  • the temperature of the metal sheet S is measured with a non-contact type thermometer on the delivery side of the soaking zone of the continuous annealing furnace. Then, the temperature of the metal sheet S immediately before or at the time of reaching the cooling start position SP can be calculated based on the temperature and the amount of temperature decrease due to the natural cooling of the metal sheet S until it reaches the quenching device 1. can.
  • the amount of temperature decrease due to the natural cooling of the metal plate S described above can be obtained in advance by experiments.
  • the target temperature T2 means a target value of the temperature of the metal plate S at the position RP where the metal plate S is constrained by the constraining rolls 20 .
  • the cooling rate CV (°C/s) is determined by the nozzle shape or the coefficient ⁇ (°C mm/s) indicating the cooling conditions such as the type, temperature, and injection amount of the cooling fluid CF to be jetted, and the thickness of the metal plate S. It can be represented by the following formula (3) using t.
  • the distance d can be expressed by the following formula (3).
  • the position control device 40 stores the cooling rate CV (°C/s) or ⁇ (°C ⁇ mm/s) obtained in advance through experiments, numerical analysis, or the like. Then, the position control device 40 obtains the distance d using the formula (1) or (3), and adjusts the cooling fluid CF in the cooling tank 11 so as to constrain the metal plate S at the position of the obtained distance d. Adjust the height of the fluid surface.
  • the cooling rate CV may be set to 1500 (°C/s), which is the middle of the above range.
  • ⁇ may be treated as an intermediate value of 1250 (°C ⁇ mm/s).
  • the cooling condition ⁇ obtained by the above-described cooling rate CV, plate thickness t, and equation (2) may be set.
  • the initial cooling rate CV of the metal plate S can be changed by combining slow cooling by simply immersing the metal plate S in the liquid and rapid cooling by the nozzle 12. It is possible to change.
  • a high cooling rate CV is obtained by destroying the vapor film formed on the surface of the metal plate S due to boiling by the liquid jet.
  • the cooling rate CV decreases.
  • the height of the liquid surface is the position at which the liquid jet from the nozzles 12 collides with the metal plate S. preferably higher than
  • the range of the height of the liquid surface from the nozzle 12, that is, the distance between the liquid surface and the nozzle 12 is preferably, for example, 30 mm or more and 2000 mm or less.
  • the liquid surface When the liquid surface is closer to the collision position of the liquid jet than 30 mm, which is the lower limit of the distance, the liquid surface fluctuates under the influence of the liquid jet from the nozzle 12 . Specifically, the cooling ability for the metal plate S is not stable because the liquid surface periodically moves up and down. As a result, the temperature (restraining temperature) at the location where the metal plate S is restrained by the restraining rolls 20 may fluctuate, and the shape of the metal plate S may change periodically.
  • the upper limit of the distance is appropriately determined according to the metallurgical properties of the metal plate S, the transport speed v, the cooling speed CV, and the like.
  • rapid cooling in the transformation temperature range is required to obtain desired metallic properties by liquid quenching. Therefore, considering that the conveying speed range in a general metal plate quenching treatment process is 10 m/min to 600 m/min, it is not preferable that the upper limit exceeds 2000 mm. This is because if the upper limit exceeds 2000 mm, there is a high possibility that sufficient cooling capacity for the metal plate S in the transformation temperature range cannot be obtained. Therefore, the distance between the liquid surface and the nozzle 12 is preferably 30 mm or more and 2000 mm or less. Furthermore, it is more preferably 50 mm or more and 1000 mm or less in order to stabilize the liquid surface more and obtain an effective cooling rate.
  • the metal plate S is cooled by the cooling device 10 while being transported, and the metal plate S is quenched.
  • the height of the fluid surface of the cooling fluid CF in the cooling tank 11 is adjusted so that the metal plate S is constrained from both sides in the thickness direction of the metal plate S at the position RP where the metal plate S reaches the target temperature T2. be done.
  • the distance d is calculated using the above formula (1) or formula (3), and the cooling tank 11 is moved so as to constrain the metal plate S at the position of the calculated distance d.
  • the height of the fluid surface of the cooling fluid CF inside is adjusted. Note that the adjustment of the height of the fluid surface can be performed successively even while the metal plate S is being quenched.
  • the position control device 40 may calculate the distance d and adjust the height of the fluid surface at the timing when the transport speed v is changed.
  • the transport speed of the metal plate S fluctuates even for one metal plate S (within one coil). Therefore, if the height of the fluid surface can be moved up and down while the metal plate S is restrained by the restraining rolls 20, the yield of the decelerating portions such as the front end and the tail end of the metal plate S can be improved, which is more preferable.
  • the position control device 40 may calculate the distance d and adjust the height of the fluid surface for each set period.
  • the operation of the water level adjuster 30 is controlled to adjust the height of the fluid surface of the cooling fluid CF in the cooling tank 11, which is the cooling start position.
  • the metal sheet S at the target temperature T2 can be restrained by the restraining rolls 20 regardless of the manufacturing conditions of the metal sheet S.
  • the continuous annealing equipment it is possible to suppress shape defects of the metal sheet S due to manufacturing conditions of the metal sheet S that occur during quenching.
  • the temperature of the metal plate S conveyed to the hardening apparatus 1 varies depending on the manufacturing conditions of the metal plate S, such as the conveying speed v, the cooling start temperature T1 of the metal plate S, and the thickness t of the metal plate S. Therefore, if the distance d is set constant regardless of the manufacturing conditions, the temperature of the metal sheet S when it reaches the restraining rolls 20 also varies.
  • the height of the fluid surface of the cooling fluid CF in the cooling bath 11 can be adjusted. found to be effective. By adjusting the height of the fluid surface of the cooling fluid CF in the cooling bath 11, the metal plate S can be restrained within the target temperature range even if the manufacturing conditions change.
  • the metal plate S is a high-strength steel plate (high-tensile steel)
  • the effect of suppressing deformation is particularly large.
  • it is preferably applied to the production of steel sheets having a tensile strength of 580 MPa or more.
  • the upper limit of the tensile strength is not particularly limited, it may be 2000 MPa or less as an example.
  • the high-strength steel sheets (high-tensile steel) include high-strength cold-rolled steel sheets, hot-dip galvanized steel sheets, electro-galvanized steel sheets, alloyed hot-dip galvanized steel sheets, and the like.
  • the composition of the high-strength steel sheet in mass%, C is 0.04% or more and 0.35% or less, Si is 0.01% or more and 2.50% or less, and Mn is 0.80% or more and 3 .70% or less, P is 0.001% or more and 0.090% or less, S is 0.0001% or more and 0.0050% or less, sol.
  • Al is 0.005% or more and 0.065% or less, if necessary, at least one of Cr, Mo, Nb, V, Ni, Cu, and Ti is 0.5% or less, and if necessary , B, and Sb are each 0.01% or less, and the balance is Fe and unavoidable impurities.
  • the metal plate is not limited to the steel plate, and may be a metal plate other than the steel plate.
  • a high-strength cold-rolled steel sheet (hereinafter referred to as a steel sheet) having a thickness t of 1.0 mm and a width of 1000 mm and a tensile strength of 1470 MPa ) was quenched.
  • the composition of the steel sheet with a tensile strength of 1470 MPa is, in mass%, 0.20% C, 1.0% Si, 2.3% Mn, 0.005% P, and 0.002% S. bottom.
  • the temperature TMs at the Ms point of the steel sheet is 300°C
  • the temperature TMf at the Mf point is 250°C.
  • the target temperature T2 of the steel sheet when passing through the constraining rolls 20 may be set within the range of 450.degree. C. to 100.degree.
  • the target temperature T2 is set at 400.degree.
  • the cooling start temperature T1 was set to 800°C.
  • the temperature of the cooling fluid CF was approximately 30° C., and the cooling rate CV was set at 1500 (° C./s).
  • FIG. 3 is a schematic diagram showing an example of the definition of the amount of warpage. As shown in FIG. 3, the amount of warp was defined as the height from the contact surface to the highest position when the steel plate was placed on a horizontal surface.
  • FIG. 4 is a graph showing the relationship between the conveying speed v and the target temperature in the example of the present invention
  • FIG. 5 is a graph showing the relationship between the conveying speed v and the warp amount of the metal plate in the example of the present invention.
  • the temperature (°C) of the steel plate was 400 ⁇ 25°C. That is, even if the conveying speed v changed, the temperature (° C.) of the steel sheet when passing through the restraining rolls 20 could be controlled within the range of the target temperature T2 (450° C. to 100° C.).
  • the amount of warpage of all the steel sheets was reduced to 10 mm or less.
  • the variation which is the difference between the maximum value and the minimum value of the amount of warpage, was suppressed to 4.2 mm.
  • FIG. 6 is a graph showing the relationship between the conveying speed v and the target temperature in Comparative Example 1
  • FIG. 7 is a graph showing the relationship between the conveying speed v and the warp amount of the metal plate in Comparative Example 1.
  • FIG. 8 is a graph showing the relationship between the transport speed v and the target temperature in Comparative Example 2
  • FIG. 9 is a graph showing the relationship between the transport speed v and the warp amount of the metal plate S in Comparative Example 2.
  • the distance d was controlled by moving the movable masking while the restraint roll 20 was fixed and controlling the cooling start position.
  • Other conditions were the same as in the present invention example to produce the above steel plate.
  • the target temperature T2 is (TMs+150) (° C.) to (TMf ⁇ 150) (° C.), but is not limited to this.
  • the target temperature T2 is set to (TMs + 150) (°C) ⁇ ( It may not be limited to TMf-150) (°C).
  • the target temperature T2 is determined in advance, taking into account the expected shape (for example, the amount of warpage) while keeping in mind the degree of freedom of processing and operation in the post-process. Further, by adjusting the position of the constraining roll 20, the distance d from the cooling start position to the constraining roll 20 is controlled. In this way, the temperature of the metal plate S when passing through the restraining rolls 20 is set to the predetermined temperature T2, and the shape of the metal plate S, that is, the variation in the amount of warp of the metal plate S defined in FIG. It should be within
  • the constraining roll 20 may be configured to move in the longitudinal direction of the metal plate S, that is, in the conveying direction of the metal plate S. That is, the quenching apparatus 1 for the metal plate S may include a roll moving device for moving the constraining roll 20 made up of, for example, a motor.
  • the distance d is controlled by both the height of the fluid surface of the cooling fluid CF and the position of the constraining rolls 20 .
  • the distance d can be precisely controlled, for example, by roughly adjusting the distance d with the water level adjuster 30 and finely adjusting the distance d by adjusting the position of the restraint rolls 20 .
  • the conveying speed v is changed between 1000 mm/s and 2500 mm/s, and the distance between the liquid surface and the collision position of the liquid jet from the nozzle 12 on the steel plate in the vertical direction (hereinafter referred to as the collision position)
  • the steel plate was quenched under the same manufacturing conditions as in Example 1, except that the was changed between 0 mm and 400 mm.
  • Table 1 shows the results of verification of the relationship between the liquid level height and the collision position in Example 2.
  • the collision position is a position where a straight line drawn from the center of the nozzle 12 in the direction of liquid injection intersects the surface of the steel plate. Further, presence or absence of change in the shape of the steel sheet in the longitudinal direction (that is, the same direction as the conveying direction of the steel sheet) was visually inspected under a sufficiently bright fluorescent lamp in the inspection on the delivery side.
  • Example 1 to 5 of the present invention in which the distance between the liquid surface and the collision position was 30 mm or more, no periodic variation in warpage in the longitudinal direction of the steel plate was observed. Also, the maximum amount of warp in the width direction of the steel plate sampled every 100 m tended to decrease as the distance and the conveying speed v increased. That is, in Examples 1 to 5 of the present invention, the initial cooling of the steel sheet could be slow cooling by setting the liquid level higher than the collision position of the liquid jet from the nozzle by 30 mm or more. As a result, the stress due to rapid thermal contraction can be reduced, the shape deformation of the steel sheet can be suppressed, and the amount of warpage of the steel sheet can be reduced.
  • Metal plate quenching device 10 Cooling device 11 Cooling tank 12 Nozzle 20 Constrained roll 30 Water level adjuster 40 Position control device BD Conveying direction CF Cooling fluid S Metal plate

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

La présente invention vise à résoudre le problème de suppression d'irrégularité de la forme d'une feuille métallique, générée lors de la réalisation d'un durcissement par trempe de celle-ci.　L'appareil de durcissement par trempe de feuille métallique (1) refroidit une feuille métallique (S) tout en déplaçant ladite feuille métallique et comprend: un bain de refroidissement (11) qui stocke un fluide de refroidissement (CF) et dans lequel la feuille métallique (S) est immergée et refroidie; un rouleau de retenue (20) qui est installé dans le bain de refroidissement (11) et qui déplace la feuille métallique (S) qui a été refroidie par le bain de refroidissement (11) tout en retenant ladite feuille métallique dans la direction de l'épaisseur; un dispositif de réglage de niveau de liquide (30) qui ajuste la hauteur d'une surface de fluide du fluide de refroidissement (CF) dans le bain de refroidissement (11); et un dispositif de commande de position (40) qui commande le fonctionnement du dispositif de réglage de niveau de liquide (30) pour régler la hauteur de la surface de fluide du fluide de refroidissement (CF) dans le bain de refroidissement (11).
PCT/JP2022/029365 2021-08-24 2022-07-29 Appareil de durcissement par trempe, procédé de durcissement par trempe et procédé de fabrication feuille métallique WO2023026774A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
MX2024002108A MX2024002108A (es) 2021-08-24 2022-07-29 Aparato de temple rapido, metodo de temple rapido y metodo de fabricacion de laminas de metal.
EP22861065.5A EP4372106A1 (fr) 2021-08-24 2022-07-29 Appareil de durcissement par trempe, procédé de durcissement par trempe et procédé de fabrication feuille métallique
JP2022559510A JP7508024B2 (ja) 2021-08-24 2022-07-29 焼入れ装置及び焼入れ方法並びに金属板の製造方法
CN202280055845.3A CN117836436A (zh) 2021-08-24 2022-07-29 淬火装置及淬火方法以及金属板的制造方法
KR1020247004916A KR20240035543A (ko) 2021-08-24 2022-07-29 ??칭 장치 및 ??칭 방법 그리고 금속판의 제조 방법

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JP2021-136142 2021-08-24

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JP (1) JP7508024B2 (fr)
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WO (1) WO2023026774A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS462733B1 (fr) * 1967-02-07 1971-01-23
JPS4855811A (fr) * 1971-11-15 1973-08-06
JPS5173911A (en) * 1974-12-24 1976-06-26 Nippon Kokan Kk Kosutoritsupuoteisankajotaidemizuyakiiresuruhoho oyobi sochi
JPS565932A (en) * 1979-06-29 1981-01-22 Nippon Kokan Kk <Nkk> Continuous annealing apparatus
JP6094722B2 (ja) 2014-11-28 2017-03-15 Ｊｆｅスチール株式会社 金属板の製造方法および急冷焼入れ装置
JP2019090106A (ja) 2017-11-15 2019-06-13 Ｊｆｅスチール株式会社 急冷焼入れ装置及び急冷焼入れ方法並びに金属板製品の製造方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6094722U (ja) 1983-12-02 1985-06-28 日立電線株式会社 アンダ−カ−ペツトケ−ブル

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS462733B1 (fr) * 1967-02-07 1971-01-23
JPS4855811A (fr) * 1971-11-15 1973-08-06
JPS5173911A (en) * 1974-12-24 1976-06-26 Nippon Kokan Kk Kosutoritsupuoteisankajotaidemizuyakiiresuruhoho oyobi sochi
JPS565932A (en) * 1979-06-29 1981-01-22 Nippon Kokan Kk <Nkk> Continuous annealing apparatus
JP6094722B2 (ja) 2014-11-28 2017-03-15 Ｊｆｅスチール株式会社 金属板の製造方法および急冷焼入れ装置
JP2019090106A (ja) 2017-11-15 2019-06-13 Ｊｆｅスチール株式会社 急冷焼入れ装置及び急冷焼入れ方法並びに金属板製品の製造方法

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MX2024002108A (es) 2024-03-06
EP4372106A1 (fr) 2024-05-22
JP7508024B2 (ja) 2024-07-01
CN117836436A (zh) 2024-04-05
KR20240035543A (ko) 2024-03-15

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