WO2020085352A1 - Quenching device, quenching method, and metal plate production method - Google Patents

Quenching device, quenching method, and metal plate production method Download PDF

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Publication number
WO2020085352A1
WO2020085352A1 PCT/JP2019/041433 JP2019041433W WO2020085352A1 WO 2020085352 A1 WO2020085352 A1 WO 2020085352A1 JP 2019041433 W JP2019041433 W JP 2019041433W WO 2020085352 A1 WO2020085352 A1 WO 2020085352A1
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Prior art keywords
metal plate
quenching
roll
groove
less
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PCT/JP2019/041433
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French (fr)
Japanese (ja)
Inventor
宗司 吉本
智弘 橋向
宗佑 鈴木
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Ｊｆｅスチール株式会社
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Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to CN201980070337.0A priority Critical patent/CN112912522A/en
Priority to JP2020506833A priority patent/JP6879428B2/en
Publication of WO2020085352A1 publication Critical patent/WO2020085352A1/en

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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
    • 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
    • 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
    • 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
    • C22C38/06—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
    • C22C38/60—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 and quenching in a continuous annealing facility that performs annealing while continuously passing a metal plate, and a method for manufacturing a steel plate.
  • a water quenching method is known as one of the technologies with the fastest cooling rate of a steel sheet. In the water quenching method, the steel sheet is quenched by immersing the heated steel sheet in water and at the same time spraying cooling water on the steel sheet by a quench nozzle provided in the water.
  • Patent Document 1 in order to suppress wavy deformation of a metal plate that occurs during quenching in a continuous annealing furnace, a method is proposed in which a bridle roll is provided before and after the quenching part as a tension changing means of the steel plate subjected to the quenching process.
  • Patent Document 2 proposes a method of straightening a steel sheet by applying tension to at least the entire width direction of the front and back surfaces of the steel sheet during quenching.
  • Patent Document 3 proposes a method for preventing deformation of a steel plate by restraining a metal plate being quenched by a pair of restraining rolls.
  • Patent Document 1 applies a large amount of tension to a high temperature steel plate, so that the steel plate may be broken.
  • a large thermal crown is generated on the bridle roll before the quenching part, which comes into contact with the high temperature steel plate, and the bridle roll and the steel plate are unevenly contacted in the width direction.
  • buckling or flaws occur in the steel sheet, and there is a problem that the shape of the steel sheet cannot be improved.
  • the amount of warp is reduced to about several mm by setting the tension to 15 N / mm 2 , but such high tension may cause drawing in the steel strip. .
  • Patent Document 4 proposes a method of ejecting a liquid obliquely toward the constraining roll from the nozzle closest to the constraining roll while constraining the metal plate being quenched by a pair or a plurality of constraining rolls. .
  • the inventors of the present invention have earnestly studied to solve such a problem, and have obtained the following findings. Since the restraint roll and the metal plate are in contact with each other over the entire width direction of the plate, the escape area of water ejected from the nozzle adjacent to the restraint roll is only in the plate width direction of the metal plate, and the center part of the metal plate is The colliding water will flow laterally. Therefore, the cooling rate on the metal plate tends to be higher in the edge portion than in the central portion of the metal plate.
  • the present invention has been completed based on the above findings. That is, a quenching device and a quenching device capable of preventing non-uniformity of the cooling rate of the metal plate in the plate width direction while suppressing a decrease in the cooling rate of the metal plate while suppressing a shape defect that occurs in the metal plate during quenching. It is an object to provide a method and a method for manufacturing a steel sheet.
  • [5] The quenching apparatus according to [1], wherein the groove has a spiral shape with the axis of the constraining roll as a center.
  • the width of the groove is 10 mm or more and 50 mm or less
  • the depth is 5 mm or more and 30 mm or less
  • the interval between the groove and the groove one round before along the axial direction of the constraining roll is 50 mm or more and 200 mm or less.
  • [7] The quenching device according to any one of [1] to [6], wherein an angle formed by the metal plate and a liquid ejection direction of a nozzle adjacent to the constraining roll is 20 ° or more and 60 ° or less.
  • [8] A quenching method in which quenching quenching is performed using the quenching device according to any one of [1] to [7].
  • [9] A method for producing a steel sheet, which uses the quenching method according to [8] above when producing a steel sheet.
  • the present invention it is possible to prevent the non-uniformity of the cooling rate of the metal plate in the plate width direction while suppressing the shape defect that occurs in the metal plate during quenching and suppressing the decrease of the cooling rate of the metal plate.
  • FIG. 1 is an explanatory diagram showing a basic configuration of a quenching apparatus according to an embodiment of the present invention.
  • FIG. 2 is an enlarged view showing the vicinity of the ejection device of FIG.
  • FIG. 3 is an enlarged view of an example of the restraint roll according to the embodiment of the present invention when viewed from the side.
  • FIG. 4 is an enlarged view of another example of the restraint roll according to the embodiment of the present invention when viewed from the side.
  • FIG. 5 is an enlarged view of a conventional restraint roll viewed from the side.
  • FIG. 6 is a graph showing the results of Example 1 of the present invention.
  • FIG. 7 is a graph showing the results of Example 2 of the present invention.
  • FIG. 8 is a graph showing the results of Comparative Example 1.
  • FIG. 1 is an explanatory diagram showing a basic configuration of a quenching apparatus according to an embodiment of the present invention.
  • FIG. 2 is an enlarged view showing the vicinity of the ejection device of FIG
  • FIG. 9 is a graph showing the results of Comparative Example 2.
  • FIG. 10 is a graph showing the results of Comparative Example 3.
  • FIG. 11 is a graph showing the results of Examples 1 and 2 of the present invention and Comparative Examples 1 to 3.
  • FIG. 12 is a schematic view of the steel sheet viewed from the conveyance direction.
  • FIG. 1 is a diagram showing a basic configuration of a quenching apparatus according to an embodiment of the present invention.
  • FIG. 2 is an enlarged view of the vicinity of the ejection device 4 of the quenching device shown in FIG.
  • the quenching device can be applied to a cooling facility provided on the outflow side of the soaking zone of a continuous annealing furnace.
  • FIG. 1 shows a pair of seal rolls 3 provided at the soaking zone outlet of the continuous annealing furnace.
  • the quenching apparatus includes a water tank 1 containing water 2 which is a coolant (liquid) for cooling the metal plate 5, a jetting device 4 for spraying the water 2 on both surfaces of the metal plate 5 for cooling, and a metal plate 5 And a restraining roll 7 for restraining the deformation and preventing the deformation.
  • a part of the ejection device 4 is provided in the liquid (in the water 2) of the tank 1.
  • a sink roll 6 is provided on the outlet side of the ejection device 4 to change the transport direction (passing direction) of the metal plate 5 while immersing the metal plate 5 in water.
  • the ejection device 4 includes a plurality of nozzles 14 and 24 that eject water, and nozzle units 34 and 44 that hold the nozzles 14 and 24.
  • a gap is provided between the pair of nozzle units 34 and 44.
  • the metal plate 5 is passed through the gap, water is jetted from the nozzles 14 and 24 toward the front and back surfaces of the metal plate 5.
  • the left side of the metal plate 5 is the front surface and the right side is the back surface.
  • the nozzle unit 34 is arranged so that the nozzle 14 faces the front surface of the metal plate 5, and on the right side of the figure, the nozzle unit 44 faces so that the nozzle 24 faces the back surface of the metal plate 5. Will be placed.
  • the nozzle units 34 and 44 are each divided into two along the carrying direction.
  • An inlet side nozzle unit 34a and an outlet side nozzle unit 34b are provided on the front surface side of the metal plate 5, and an inlet side nozzle unit 44a and an outlet side nozzle unit 44b are provided on the back surface side.
  • the restraint roll 7 is provided between the inlet nozzle units 34a and 44a and the outlet nozzle units 34b and 44b. Thereby, the restraint roll 7 is provided between the inlet side end portion (the inlet side end surface of the inlet side nozzle units 34a, 44a) and the outlet side end portion (the outlet side end surface of the outlet side nozzle units 34b, 44b) of the ejection device. Will be provided.
  • the inlet-side nozzle units 34a, 44a are provided so that a part thereof is immersed in water and the remaining part comes out of the water.
  • the metal plate 5 that has been passed through is inserted into a gap inside the inlet nozzle units 34a and 44a exposed on the water, then immersed in the water, and water is ejected from the nozzles 14 and 24.
  • the inlet nozzle units 34a, 44a are provided with a plurality of nozzles 14, 24.
  • Some nozzles (for example, the nozzles provided at the top of the inlet-side nozzle units 34a and 44a in FIG. 1) have an opening of the nozzle located above the water surface, and at least a part of the opening of the nozzle is underwater. Not soaked in.
  • the nozzle whose opening is located above the water surface suppresses the water from being blown up when the high-temperature metal plate 5 is introduced into the water. It is installed diagonally.
  • the metal plate 5 is constrained by the constraining roll 7 after passing through the inlet nozzle units 34a, 44a.
  • the restraint roll 7 sandwiches the metal plate 5 from both sides (front and back surfaces) in water in order to prevent deformation that may occur when the metal plate 5 is rapidly cooled.
  • the pair of restraining rolls 7 are arranged with their central axes displaced in the transport direction of the metal plate 5. By arranging the central axes so as to be displaced, the restraining force of the metal plate 5 can be increased and the shape correcting force can be increased.
  • the constraining rolls 7 it is preferable to dispose the constraining rolls 7 by displacing the respective central axes in the transport direction by 40 mm or more and 150 mm or less, and it is more preferable to dispose the constraining rolls 7 by 80 mm or more and 100 mm or less.
  • the pushing amount by one restraint roll 7 is 0 mm or more and 2.5 mm or less in the horizontal direction when the reference (0 mm) is the case where the metal plate 5 is linearly threaded as shown in FIGS. 1 and 2. It is preferable that More preferably, it is 0.5 mm or more and 1.0 mm or less.
  • the metal plate 5 After passing through the constraining roll 7, the metal plate 5 passes through the gap between the outlet nozzle units 34b and 44b. Also at this time, water is jetted to the front and back surfaces of the metal plate 5 by the nozzles 14 and 24 provided in the outlet nozzle units 34b and 44b.
  • the inlet-side nozzle units 34a and 44a and the outlet-side nozzle units 34b and 44b are provided so as to sandwich the constraining roll 7 from above and below, and the height of the constraining roll 7 and the nozzle unit and the nozzles Is not provided.
  • the nozzles 14a and 24a located on the most outlet side of the inlet side nozzle units 34a and 44a and the nozzles 14b and 24b located on the most inlet side of the outlet side nozzle units 34b and 44b are attached to the restraining roll 7. It becomes an adjacent nozzle.
  • the above adjacent nozzles may be referred to as "adjacent nozzles" hereinafter.
  • the adjacent nozzles are not horizontal but are installed so as to be inclined so that the nozzle openings face from the horizontal plane toward the constraining roll 7. That is, the adjacent nozzles are inclined from the direction perpendicular to the metal plate 5 toward the restraining roll 7. More specifically, the adjacent nozzles 14a and 24a in FIG. 2 are attached while being inclined downward, and the adjacent nozzles 14b and 24b are attached while being inclined upward. Inclining the adjacent nozzles in this way allows the water ejected from the adjacent nozzles to reach a position closer to the contact point between the constraining roll 7 and the metal plate 5, as compared with the case where the adjacent nozzles are provided horizontally.
  • all the nozzles other than the adjacent nozzles are also tilted in the same direction as the adjacent nozzles, but the nozzles other than the adjacent nozzles may be horizontally provided as before.
  • the inclination angle of the adjacent nozzle may be set to an acute angle ⁇ among the angles formed by the axial direction of the adjacent nozzle (liquid ejection direction (water ejection direction)) and the metal plate. it can.
  • the direction of the central axis of the water discharged from the nozzle can be adopted as the jetting direction of the water.
  • the angle ⁇ can be set according to the amount of water jetted from the adjacent nozzle, the distance between the opening of the adjacent nozzle and the restraint roll 7, the distance between the opening of the adjacent nozzle and the front and back surfaces of the metal plate 5, and the like.
  • a preferable example of the angle ⁇ is 20 ° or more and 60 ° or less.
  • the angle ⁇ is 20 ° or more and 60 ° or less, the flow of water ejected from the adjacent nozzle reaches the vicinity of the contact position between the restraint roll 7 and the metal plate 5, and the metal plate 5 near the restraint roll 7 is reached. It is possible to sufficiently obtain the effect of suppressing the decrease in the cooling rate. Further, it is more preferable that the angle ⁇ is 30 ° or more and 45 ° or less.
  • the tip of the nozzle may be inclined so that water can be jetted obliquely from the nozzle.
  • the quenching device may include a non-divided nozzle unit integrally formed along the transport direction of the metal plate 5.
  • each nozzle in the ejection device 4 is connected to a pipe provided with a pump in the middle.
  • the pump the water 2 in the water tank 1 is pumped up in the pipe and pressure-fed to the nozzles 14 and 24, whereby high-pressure water is ejected from the openings of the nozzles 14 and 24.
  • the water 2 in the water tank 1 is maintained at a water temperature suitable for quenching.
  • Part of the water 2 in the water tank 1 is sent to a cooling facility such as an external cooling tower to be cooled, and then the cooled water 2 is returned to the water tank 1 to prevent an increase in the water temperature in the water tank 1.
  • the water temperature in the water tank 1 is preferably more than 0 ° C and 50 ° C or less, and particularly preferably 10 ° C or more and 40 ° C or less.
  • the quenching apparatus according to the embodiment of the present invention is provided with a constraining roll different from the conventional constraining roll.
  • FIG. 5 is a side view of the conventional restraint roll 7 (7X).
  • the restraint roll 7X When the restraint roll 7X is used, the restraint roll 7 and the metal plate 5 come into contact with each other in the entire plate width direction, and the escape area of the water ejected from the adjacent nozzle of the restraint roll 7 is only in the plate width direction. The water that collides with the central part of the river flows laterally. Therefore, the cooling rate on the metal plate 5 tends to be higher in the edge portion than in the central portion of the metal plate 5.
  • FIG. 3 is a side view of the restraint roll 7 (7A) according to the embodiment of the present invention
  • FIG. 4 is another restraint roll 7 (7B) according to the embodiment of the present invention. It is the figure which looked at from the side.
  • a ring-shaped groove 7a that surrounds the axis of the constraining rolls is provided on the roll surfaces of the constraining rolls 7A and 7B, and the constraining rolls 7A and 7B and the metal plate 5 have a plate width of the metal plate 5.
  • the escape area of water ejected from the adjacent nozzles of the restraint rolls 7A and 7B exists not only in the plate width direction of the metal plate 5 but also in the plate passing direction, and the water that collides with the central portion of the metal plate 5 has only a lateral flow. Not only that, it also starts to flow vertically.
  • the groove 7 a releases water ejected from the adjacent nozzles in the sheet passing direction of the metal plate 5 (longitudinal direction of the metal plate 5) and suppresses a lateral flow toward the edge portion of the metal plate 5. Therefore, the cooling rate on the metal plate 5 is uniform in the plate width direction without any difference between the central part and the edge part of the metal plate 5.
  • a plane including a ring shape may be perpendicular to the axial direction of the binding roll as in the binding roll 7A in FIG. 3, or a plane including a ring may be bound as in the binding roll 7B in FIG. It may be oblique with respect to the axial direction of the roll.
  • the restraint roll 7B is inclined with respect to the axial direction of the restraint roll 7B as shown in FIG. 4, the surface quality of the metal plate 5 can be maintained in a better state, which is more preferable.
  • the width of the annular groove 7a (one side along the axial direction of the restraint roll 7) is preferably 10 mm or more and 50 mm or less, more preferably 10 mm or more and 30 mm or less, and further preferably 15 mm or more and 25 mm or less.
  • the depth of the ring-shaped groove 7a is preferably 5 mm or more and 30 mm or less, more preferably 5 mm or more and 15 mm or less, and further preferably 8 mm or more and 12 mm or less.
  • the interval between the grooves 7a along the axial direction of the constraining roll 7 is preferably 50 mm or more and 200 mm or less, more preferably 50 mm or more and 150 mm or less, and further preferably 75 mm or more and 125 mm or less.
  • the interval between the grooves 7a is the distance between the ends of the adjacent grooves.
  • the groove 7a may have a spiral shape centered on the axis of the constraining roll.
  • the width may be 10 mm or more and 50 mm or less
  • the depth may be 5 mm or more and 30 mm or less
  • the interval between the groove one round before along the axial direction of the restraint roll 7 may be 50 mm or more and 200 mm or less.
  • the more preferable range and the more preferable range of the shape of the groove are the same as those of the constraining roll 7A.
  • the restraint roll 7 be a drive roll.
  • the restraint roll 7 can be opened and closed (the amount of pushing into the metal plate 5 can be controlled) as necessary.
  • the restraint roll 7 may be formed of a material having excellent thermal conductivity and strength enough to withstand the load when the metal plate 5 is pinched.
  • Examples of the material of the constraining roll 7 include SUS304, SUS310, and ceramics.
  • the quenching apparatus and the quenching method using the quenching apparatus according to the embodiment of the present invention as described above can be applied to the production of a steel sheet, and particularly preferably applied to the method for producing a high-strength cold-rolled steel sheet (high tensile strength steel sheet). . More specifically, it is preferably applied to a method for manufacturing a steel sheet having a tensile strength of 580 MPa or more.
  • the upper limit of the tensile strength is not particularly limited, but may be 1600 MPa or less as an example.
  • the cooling rate in the plate width direction is made uniform and the desired strength is ensured. High ten can be manufactured.
  • C is 0.04% or more and 0.25% or less
  • Si is 0.01% or more and 2.50% or less
  • Mn is 0.80% or more and 3% by mass. .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
  • Al is 0.005% or more and 0.065% or less, and if necessary, at least one kind 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 inevitable impurities.
  • the embodiment of the present invention is not limited to an example of rapidly cooling a steel sheet, but can be applied to the rapid cooling of all metal sheets other than the steel sheet, and is also applied to quenching using a liquid other than water. can do.
  • the temperature of the steel plate being passed through the quenching device was measured. Specifically, the temperature of the measured region of the steel sheet was measured with time using a thermocouple-type thermometer.
  • the cooling start temperature of the steel sheet (the temperature immediately before entering the jetting device 4) was 740 ° C
  • the cooling end temperature (the temperature immediately after leaving the water tank 1) was 30 ° C. From the relationship between the elapsed time after the start of cooling and the temperature of the steel sheet, the cooling rate distribution in the sheet width direction of the steel sheet at the moment when the steel sheet was in contact with the restraint roll 7A was calculated. Results are shown in FIG.
  • the amount of warp of the steel plate was measured after passing the plate. Specifically, a description will be given with reference to FIG. 12 in which the steel sheet is viewed from the conveying direction. When the steel plate warps, a high-height portion and a low-height portion are formed in the width direction of the steel sheet. In the steel sheet after passing, the difference in height between the highest portion and the lowest portion was measured as the amount of warpage.
  • Example 1 An experiment was conducted in the same manner as Example 1 of the present invention, except that the quenching device described in Patent Document 4 and the restraining roll 7X shown in FIG. 5 were used. The results are shown in Fig. 8.
  • Example 2 An experiment was conducted in the same manner as Example 1 of the present invention, except that the quenching device described in Patent Document 3 and the restraint roll 7X shown in FIG. 5 were used. The inclination angle of the adjacent nozzle was 90 °. The results are shown in Fig. 9.
  • the cooling rate is 900 ° C./s at the central portion and 1200 ° C./s at the edge, and the cooling rate is reduced by about 40% (1500 ° C./s to 900 ° C./s) compared with FIG. 6 in the central portion.
  • FIG. 10 Comparative Example 3
  • the cooling speed is higher in the edge portion than in the central portion, and the cooling is uneven.
  • the cooling rate was 1500 ° C./s at the center and 1700 ° C./s at the edges.
  • the tensile strength of the steel sheets manufactured according to Inventive Examples 1 and 2 was about 1470 MPa in the entire widthwise direction.
  • the tensile strength of the steel sheet manufactured in Comparative Example 1 was about 1470 MPa in the central portion of the plate width, but was about 1550 MPa at the edge portion, showing uneven tensile strength.
  • the tensile strength of the steel sheet manufactured in Comparative Example 2 was about 1350 MPa at the center of the sheet width and about 1400 MPa at the edge portion, showing a decrease in tensile strength and nonuniformity.
  • the tensile strength of the steel sheet produced in Comparative Example 3 was about 1470 MPa in the central portion of the sheet width, but about 1520 MPa at the edge portion, and uneven tensile strength was observed. When there was a difference of 30 MPa or more in the tensile strength between the central portion and the edge portion of the steel sheet, it was determined that the tensile strength was non-uniform. From this, it is shown that by applying the present invention, it is possible to prevent the deterioration or non-uniformity of the characteristics of the steel sheet due to the decrease or non-uniformity of the cooling rate in the vicinity of the constraining rolls.
  • the present invention while suppressing a defective shape that occurs in a metal plate during quenching, while suppressing a decrease in cooling rate of the metal plate, it is possible to make the cooling rate in the plate width direction uniform, a quenching device, quenching It is possible to provide a method and a method for manufacturing a steel sheet using the quenching method.

Abstract

Provided are a quenching device, a rapid-cooling quenching method, and metal plate production method, whereby shape defects in metal plates during quenching can be suppressed, reduction in metal plate cooling speed can be suppressed, and lack of cooling speed uniformity in the plate width direction of the metal plates can be prevented. This quenching device immerses and cools a high-temperature metal plate in liquid and comprises: a tank housing the liquid in which the metal plate is immersed; a jetting device having at least part thereof provided inside the liquid in the tank and comprising a plurality of nozzles that jet the liquid on to both surfaces of the metal plate; and a restraining roll provided between an entry side end section and an exit side end section of the jetting device and pinching the metal plate from both sides. The jetting device is characterized by: at least a nozzle adjacent to the restraining roll being inclined from the vertical direction relative to the metal plate, towards the restraining roll; and the restraining roll having a groove that causes the liquid jetted from the adjacent nozzle to escape in the longitudinal direction of the metal plate.

Description

焼入れ装置及び焼入れ方法並びに鋼板の製造方法Quenching apparatus, quenching method, and steel sheet manufacturing method
　本発明は、金属板を連続的に通板しながら焼鈍を行う連続焼鈍設備における焼入れ装置及び焼入れ並びに鋼板の製造方法に関する。 The present invention relates to a quenching apparatus and quenching in a continuous annealing facility that performs annealing while continuously passing a metal plate, and a method for manufacturing a steel plate.
　鋼板をはじめとする金属板の製造においては、連続焼鈍設備において、金属板を加熱後に冷却し、相変態を起こさせる等して材質の造り込みを行う。近年、自動車業界では車体の軽量化と衝突安全性の両立を目的として、薄肉化した高張力鋼板（ハイテン）の需要が増している。ハイテンの製造時には、鋼板を急速に冷却する技術が重要となる。鋼板の冷却速度が最も速い技術の１つとして、水焼入れ法が知られている。水焼入れ法では、加熱された鋼板を水中に浸漬させると同時に、水中内に設けられたクエンチノズルにより冷却水を鋼板に噴射することで、鋼板の焼入れが行われる。鋼板の焼入れ時には、鋼板に反りや波状変形等の形状不良が発生するという問題がある。このような鋼板の焼入れ時における形状不良を防止するために、従来、様々な手法が提案されている。 In the production of metal sheets such as steel sheets, in a continuous annealing equipment, the metal sheet is heated and then cooled to undergo phase transformation, etc. to build in the material. In recent years, in the automobile industry, there is an increasing demand for thin high-strength steel sheets (high tensile strength steel sheets) for the purpose of achieving both weight reduction of vehicle bodies and collision safety. When manufacturing high-tensile steel, technology for rapidly cooling the steel sheet is important. A water quenching method is known as one of the technologies with the fastest cooling rate of a steel sheet. In the water quenching method, the steel sheet is quenched by immersing the heated steel sheet in water and at the same time spraying cooling water on the steel sheet by a quench nozzle provided in the water. When quenching a steel sheet, there is a problem in that the steel sheet suffers from shape defects such as warpage and wavy deformation. In order to prevent such a defective shape at the time of quenching a steel sheet, various methods have been conventionally proposed.
　例えば、特許文献１では、連続焼鈍炉での焼入れ時に生じる金属板の波状変形を抑制するために、焼入れ工程に付される鋼板の張力変更手段として、ブライドルロールを焼入れ部前後に設ける手法が提案されている。また、特許文献２には、焼入れの際に鋼板の表裏面の少なくとも幅方向の全域に亘って張力を付与することにより、鋼板を平坦状に矯正する手法が提案されている。また、特許文献３には、焼入れ中の金属板を一対の拘束ロールにより拘束することで、鋼板の変形を防止する手法が提案されている。 For example, in Patent Document 1, in order to suppress wavy deformation of a metal plate that occurs during quenching in a continuous annealing furnace, a method is proposed in which a bridle roll is provided before and after the quenching part as a tension changing means of the steel plate subjected to the quenching process. Has been done. Further, Patent Document 2 proposes a method of straightening a steel sheet by applying tension to at least the entire width direction of the front and back surfaces of the steel sheet during quenching. Further, Patent Document 3 proposes a method for preventing deformation of a steel plate by restraining a metal plate being quenched by a pair of restraining rolls.
　しかし、特許文献１に記載された方法は、高温の鋼板に大きな張力をかけるため鋼板の破断が起きるおそれがある。また、高温の鋼板に接触する焼入れ部前のブライドルロールには大きなサーマルクラウンが発生し、ブライドルロールと鋼板とが幅方向に不均一に接触してしまう。その結果、鋼板に座屈や疵が発生するので、鋼板形状を改善することができないという問題がある。
　また、特許文献２に記載された方法では、張力１５Ｎ／ｍｍ２とすることで反り量が数ｍｍ程度まで減少しているが、このような高張力では鋼帯に絞りが発生する恐れがある。
　また、特許文献３に記載された方法では、焼入れ時の鋼板の変形を防止できるものの、金属板が拘束ロールを通過する際に、一時的に金属板の冷却速度が低下することで、金属板の特性が低下するという課題がある。具体的には、金属板の冷却速度の低下に起因して、所望の引張強度を有する金属板が得られないことがある。 However, the method described in Patent Document 1 applies a large amount of tension to a high temperature steel plate, so that the steel plate may be broken. In addition, a large thermal crown is generated on the bridle roll before the quenching part, which comes into contact with the high temperature steel plate, and the bridle roll and the steel plate are unevenly contacted in the width direction. As a result, buckling or flaws occur in the steel sheet, and there is a problem that the shape of the steel sheet cannot be improved.
Further, in the method described in Patent Document 2, the amount of warp is reduced to about several mm by setting the tension to 15 N / mm 2 , but such high tension may cause drawing in the steel strip. .
Further, in the method described in Patent Document 3, the deformation of the steel plate during quenching can be prevented, but when the metal plate passes through the constraining roll, the cooling rate of the metal plate is temporarily reduced, so that the metal plate However, there is a problem in that Specifically, a metal plate having a desired tensile strength may not be obtained due to a decrease in the cooling rate of the metal plate.
　これらの問題を解決するための技術を、本出願人は特許文献４において開示している。特許文献４では、焼入れ中の金属板を一対又は複数の拘束ロールにより拘束しつつ、拘束ロールに最も近いノズルからは、拘束ロールの方へ向かって斜めに液体を噴出する手法が提案されている。 The present applicant discloses a technique for solving these problems in Patent Document 4. Patent Document 4 proposes a method of ejecting a liquid obliquely toward the constraining roll from the nozzle closest to the constraining roll while constraining the metal plate being quenched by a pair or a plurality of constraining rolls. .
特開２０１１－１８４７７３号公報JP, 2011-184773, A 特開平１１－１９３４１８号公報Japanese Patent Laid-Open No. 11-193418 特許第６０９４７２２号公報Japanese Patent No. 6094722 特開２０１７－１１９９１２号公報JP, 2017-119912, A
　ただし、特許文献４に記載された方法では、焼入れ時の鋼板の変形を防止しつつ、拘束ロールの近傍での金属板の冷却速度の低下を抑えることができるが、金属板の板幅方向の冷却速度が不均一になるという課題がある。具体的には、金属板の中央部よりもエッジ部の冷却速度が高くなり、冷却速度の不均一性に起因して、金属板の中央部よりもエッジ部の引張強度が高くなるということがある。 However, in the method described in Patent Document 4, it is possible to suppress the deformation of the steel plate during quenching and suppress the decrease in the cooling rate of the metal plate near the restraint roll. There is a problem that the cooling rate becomes uneven. Specifically, the cooling rate of the edge part is higher than that of the central part of the metal plate, and the tensile strength of the edge part is higher than that of the central part of the metal plate due to the uneven cooling rate. is there.
　本発明者らは、このような問題を解決すべく鋭意検討を重ねた結果、以下のような知見を得た。拘束ロールと金属板は板幅方向全面で接触しているため、拘束ロールに隣接するノズルから噴出された水の逃げ場が、金属板の板幅方向にしかないことになり、金属板の中央部に衝突した水は横流れすることになる。そのため、金属板上における冷却速度は、金属板の中央部よりもエッジ部の方が高くなる傾向がある。 The inventors of the present invention have earnestly studied to solve such a problem, and have obtained the following findings. Since the restraint roll and the metal plate are in contact with each other over the entire width direction of the plate, the escape area of water ejected from the nozzle adjacent to the restraint roll is only in the plate width direction of the metal plate, and the center part of the metal plate is The colliding water will flow laterally. Therefore, the cooling rate on the metal plate tends to be higher in the edge portion than in the central portion of the metal plate.
　本発明は、上記の知見に基づき完成されたものである。すなわち、焼入れ時に金属板に発生する形状不良を抑制しつつ、金属板の冷却速度の低下を抑えながら、金属板の板幅方向の冷却速度の不均一性を防止することのできる焼入れ装置及び焼入れ方法並びに鋼板の製造方法を提供することを課題とする。 The present invention has been completed based on the above findings. That is, a quenching device and a quenching device capable of preventing non-uniformity of the cooling rate of the metal plate in the plate width direction while suppressing a decrease in the cooling rate of the metal plate while suppressing a shape defect that occurs in the metal plate during quenching. It is an object to provide a method and a method for manufacturing a steel sheet.
　上記課題を解決するための手段は、以下の通りである。
　［１］　高温の金属板を浸漬させる液体を収容した槽と、
　少なくとも一部が前記槽の液体中に設けられ、前記金属板の両面に前記液体を噴射する複数のノズルを備えた噴出装置と、
　前記噴出装置の入側端部と出側端部との間に設けられ、前記金属板を両面から挟みつける拘束ロールとを備え、
　前記噴出装置は、少なくとも前記拘束ロールに隣接するノズルが、前記金属板に対して垂直方向から前記拘束ロールの方へ傾斜しており、
　前記拘束ロールが、ロール表面に、前記隣接するノズルから噴出された液体を前記金属板の長手方向に逃がす溝を有する焼入れ装置。
　［２］　前記溝が前記拘束ロールの軸を囲う輪形であり、前記輪形を含む平面が前記拘束ロールの軸に対して垂直である前記［１］に記載の焼入れ装置。
　［３］　前記溝が前記拘束ロールの軸を囲う輪形であり、前記輪形を含む平面が前記拘束ロールの軸に対して斜めである前記［１］に記載の焼入れ装置。
　［４］　前記溝の幅が１０ｍｍ以上５０ｍｍ以下、深さが５ｍｍ以上３０ｍｍ以下で、前記拘束ロールの軸線方向に沿った溝の間隔が５０ｍｍ以上２００ｍｍ以下である前記［２］または［３］に記載の焼入れ装置。
　［５］　前記溝が前記拘束ロールの軸を中心とする螺旋状である前記［１］に記載の焼入れ装置。
　［６］　前記溝の幅が１０ｍｍ以上５０ｍｍ以下、深さが５ｍｍ以上３０ｍｍ以下で、前記拘束ロールの軸線方向に沿った一周前の溝との間隔が５０ｍｍ以上２００ｍｍ以下である前記［５］に記載の焼入れ装置。
　［７］　前記拘束ロールに隣接するノズルの液体噴出方向と前記金属板の成す角度が２０°以上６０°以下である前記［１］～［６］のいずれかに記載の焼入れ装置。
　［８］　前記［１］～［７］のいずれかに記載の焼入れ装置を用いて急冷焼入れを行う焼入れ方法。
　［９］　鋼板を製造する際に、前記［８］に記載の焼入れ方法を用いる鋼板の製造方法。 Means for solving the above problems are as follows.
[1] A tank containing a liquid in which a high-temperature metal plate is immersed,
At least a part is provided in the liquid of the tank, a jetting device including a plurality of nozzles for jetting the liquid on both surfaces of the metal plate,
A restraint roll that is provided between an inlet side end and an outlet side end of the ejection device and that holds the metal plate from both sides,
In the ejection device, at least the nozzle adjacent to the restraint roll is inclined from the direction perpendicular to the metal plate toward the restraint roll,
A quenching apparatus in which the constraining roll has a groove on the roll surface that allows the liquid ejected from the adjacent nozzle to escape in the longitudinal direction of the metal plate.
[2] The quenching apparatus according to [1], wherein the groove is a ring shape surrounding the axis of the constraining roll, and a plane including the ring shape is perpendicular to the axis of the constraining roll.
[3] The quenching apparatus according to [1], wherein the groove is a ring shape surrounding the shaft of the constraining roll, and a plane including the ring shape is oblique with respect to the shaft of the constraining roll.
[4] In [2] or [3], wherein the width of the groove is 10 mm or more and 50 mm or less, the depth is 5 mm or more and 30 mm or less, and the groove interval along the axial direction of the restraining roll is 50 mm or more and 200 mm or less. The quenching device described.
[5] The quenching apparatus according to [1], wherein the groove has a spiral shape with the axis of the constraining roll as a center.
[6] In [5], the width of the groove is 10 mm or more and 50 mm or less, the depth is 5 mm or more and 30 mm or less, and the interval between the groove and the groove one round before along the axial direction of the constraining roll is 50 mm or more and 200 mm or less. The quenching device described.
[7] The quenching device according to any one of [1] to [6], wherein an angle formed by the metal plate and a liquid ejection direction of a nozzle adjacent to the constraining roll is 20 ° or more and 60 ° or less.
[8] A quenching method in which quenching quenching is performed using the quenching device according to any one of [1] to [7].
[9] A method for producing a steel sheet, which uses the quenching method according to [8] above when producing a steel sheet.
　本発明によって、焼入れ時に金属板に発生する形状不良を抑制しつつ、金属板の冷却速度の低下を抑えながら、金属板の板幅方向の冷却速度の不均一性を防止することができる。 According to the present invention, it is possible to prevent the non-uniformity of the cooling rate of the metal plate in the plate width direction while suppressing the shape defect that occurs in the metal plate during quenching and suppressing the decrease of the cooling rate of the metal plate.
図１は、本発明の一実施形態に係る焼入れ装置の基本構成を示す説明図である。FIG. 1 is an explanatory diagram showing a basic configuration of a quenching apparatus according to an embodiment of the present invention. 図２は、図１の噴出装置の付近を示す拡大図である。FIG. 2 is an enlarged view showing the vicinity of the ejection device of FIG. 図３は、本発明の一実施形態における拘束ロールの一例を横から見た拡大図である。FIG. 3 is an enlarged view of an example of the restraint roll according to the embodiment of the present invention when viewed from the side. 図４は、本発明の一実施形態における拘束ロールの他の例を横から見た拡大図である。FIG. 4 is an enlarged view of another example of the restraint roll according to the embodiment of the present invention when viewed from the side. 図５は、従来の拘束ロールを横から見た拡大図である。FIG. 5 is an enlarged view of a conventional restraint roll viewed from the side. 図６は、本発明例１の結果を示すグラフである。FIG. 6 is a graph showing the results of Example 1 of the present invention. 図７は、本発明例２の結果を示すグラフである。FIG. 7 is a graph showing the results of Example 2 of the present invention. 図８は、比較例１の結果を示すグラフである。FIG. 8 is a graph showing the results of Comparative Example 1. 図９は、比較例２の結果を示すグラフである。FIG. 9 is a graph showing the results of Comparative Example 2. 図１０は、比較例３の結果を示すグラフである。FIG. 10 is a graph showing the results of Comparative Example 3. 図１１は、本発明例１、２及び比較例１～３の結果を示すグラフである。FIG. 11 is a graph showing the results of Examples 1 and 2 of the present invention and Comparative Examples 1 to 3. 図１２は、鋼板を搬送方向から正対して見た模式図である。FIG. 12 is a schematic view of the steel sheet viewed from the conveyance direction.
　以下、図面を参照して、本発明の一実施形態について具体的に説明する。 An embodiment of the present invention will be specifically described below with reference to the drawings.
　図１は、本発明の一実施形態に係る焼入れ装置の基本構成を示す図である。図２は図１に示す焼入れ装置の噴出装置４付近の拡大図である。焼入れ装置は、連続焼鈍炉の均熱帯の出側に設けられた冷却設備に適用されうる。図１では、連続焼鈍炉の均熱帯の出口に設けられた一対のシールロール３が示されている。焼入れ装置は、金属板５を冷却するための冷媒（液体）である水２を収容した水槽１と、金属板５の両面に水２を吹き付けて冷却するための噴出装置４と、金属板５を拘束して変形を防ぐ拘束ロール７とを備えている。噴出装置４は少なくとも一部が槽１の液体中（水２中）に設けられる。また、噴出装置４の出側には、金属板５を水中に浸漬させつつ金属板５の搬送方向（通板方向）を変更するシンクロール６が設けられる。 FIG. 1 is a diagram showing a basic configuration of a quenching apparatus according to an embodiment of the present invention. FIG. 2 is an enlarged view of the vicinity of the ejection device 4 of the quenching device shown in FIG. The quenching device can be applied to a cooling facility provided on the outflow side of the soaking zone of a continuous annealing furnace. FIG. 1 shows a pair of seal rolls 3 provided at the soaking zone outlet of the continuous annealing furnace. The quenching apparatus includes a water tank 1 containing water 2 which is a coolant (liquid) for cooling the metal plate 5, a jetting device 4 for spraying the water 2 on both surfaces of the metal plate 5 for cooling, and a metal plate 5 And a restraining roll 7 for restraining the deformation and preventing the deformation. At least a part of the ejection device 4 is provided in the liquid (in the water 2) of the tank 1. A sink roll 6 is provided on the outlet side of the ejection device 4 to change the transport direction (passing direction) of the metal plate 5 while immersing the metal plate 5 in water.
　噴出装置４は、水を噴出する複数のノズル１４、２４と、ノズル１４、２４を保持するノズルユニット３４、４４とからなる。一対のノズルユニット３４と４４との間には、間隙が設けられている。前記間隙中を金属板５が通板される際に、金属板５の表裏面に向かってノズル１４、２４から水が噴出される。図１及び図２の例では、金属板５の左側をおもて面とし、右側を裏面とする。図の左側には、ノズル１４を金属板５のおもて面に向けるようにノズルユニット３４が配置され、図の右側には、ノズル２４を金属板５の裏面に向けるようにノズルユニット４４が配置される。 The ejection device 4 includes a plurality of nozzles 14 and 24 that eject water, and nozzle units 34 and 44 that hold the nozzles 14 and 24. A gap is provided between the pair of nozzle units 34 and 44. When the metal plate 5 is passed through the gap, water is jetted from the nozzles 14 and 24 toward the front and back surfaces of the metal plate 5. In the example of FIGS. 1 and 2, the left side of the metal plate 5 is the front surface and the right side is the back surface. On the left side of the figure, the nozzle unit 34 is arranged so that the nozzle 14 faces the front surface of the metal plate 5, and on the right side of the figure, the nozzle unit 44 faces so that the nozzle 24 faces the back surface of the metal plate 5. Will be placed.
　図１及び図２の例では、ノズルユニット３４及び４４は、それぞれ搬送方向に沿って２つずつに分割される。金属板５のおもて面側には、入側ノズルユニット３４ａと出側ノズルユニット３４ｂとが設けられ、裏面側には、入側ノズルユニット４４ａと出側ノズルユニット４４ｂとが設けられる。拘束ロール７は、入側ノズルユニット３４ａ、４４ａと出側ノズルユニット３４ｂ、４４ｂとの間に設けられる。これにより、拘束ロール７は、噴出装置の入側端部（入側ノズルユニット３４ａ、４４ａの入側端面）と出側端部（出側ノズルユニット３４ｂ、４４ｂの出側端面）との間に設けられることになる。 In the example of FIGS. 1 and 2, the nozzle units 34 and 44 are each divided into two along the carrying direction. An inlet side nozzle unit 34a and an outlet side nozzle unit 34b are provided on the front surface side of the metal plate 5, and an inlet side nozzle unit 44a and an outlet side nozzle unit 44b are provided on the back surface side. The restraint roll 7 is provided between the inlet nozzle units 34a and 44a and the outlet nozzle units 34b and 44b. Thereby, the restraint roll 7 is provided between the inlet side end portion (the inlet side end surface of the inlet side nozzle units 34a, 44a) and the outlet side end portion (the outlet side end surface of the outlet side nozzle units 34b, 44b) of the ejection device. Will be provided.
　入側ノズルユニット３４ａ、４４ａは、一部が水中に浸漬し、残部が水上から出るように設けられる。通板されてきた金属板５は、水上に露出する入側ノズルユニット３４ａ、４４ａの内側の間隙に装入され、次いで水中に浸漬し、ノズル１４及び２４から水が噴出される。入側ノズルユニット３４ａ、４４ａには、複数のノズル１４、２４が設けられている。一部のノズル（例えば図１の入側ノズルユニット３４ａ、４４ａの最も上に設けられたノズル）は、ノズルの開口部が水面よりも上部に位置し、ノズルの開口部の少なくとも一部が水中に浸漬していない状態にある。開口部が水面よりも上部に位置するノズルは、高温の金属板５が水中に導入された際に発生する水の噴き上げを抑えるため、斜め下に向かって水を噴出できるように、下方向に向いて斜めに設けられている。 The inlet- side nozzle units 34a, 44a are provided so that a part thereof is immersed in water and the remaining part comes out of the water. The metal plate 5 that has been passed through is inserted into a gap inside the inlet nozzle units 34a and 44a exposed on the water, then immersed in the water, and water is ejected from the nozzles 14 and 24. The inlet nozzle units 34a, 44a are provided with a plurality of nozzles 14, 24. Some nozzles (for example, the nozzles provided at the top of the inlet- side nozzle units 34a and 44a in FIG. 1) have an opening of the nozzle located above the water surface, and at least a part of the opening of the nozzle is underwater. Not soaked in. The nozzle whose opening is located above the water surface suppresses the water from being blown up when the high-temperature metal plate 5 is introduced into the water. It is installed diagonally.
　金属板５は、入側ノズルユニット３４ａ、４４ａを通過した後に、拘束ロール７により拘束される。拘束ロール７は、金属板５の急冷時に生じうる変形を防止するために、水中において金属板５を両面（表裏面）から挟みつける。一対の拘束ロール７は、中心軸を金属板５の搬送方向にずらして配置することが好ましい。中心軸をずらして配置することで、金属板５の拘束力を増大させ、形状矯正力を高めることができる。一例として、それぞれの中心軸を搬送方向に４０ｍｍ以上１５０ｍｍ以下ずらして拘束ロール７を配置することが好ましく、８０ｍｍ以上１００ｍｍ以下ずらして配置することがさらに好ましい。 The metal plate 5 is constrained by the constraining roll 7 after passing through the inlet nozzle units 34a, 44a. The restraint roll 7 sandwiches the metal plate 5 from both sides (front and back surfaces) in water in order to prevent deformation that may occur when the metal plate 5 is rapidly cooled. It is preferable that the pair of restraining rolls 7 are arranged with their central axes displaced in the transport direction of the metal plate 5. By arranging the central axes so as to be displaced, the restraining force of the metal plate 5 can be increased and the shape correcting force can be increased. As an example, it is preferable to dispose the constraining rolls 7 by displacing the respective central axes in the transport direction by 40 mm or more and 150 mm or less, and it is more preferable to dispose the constraining rolls 7 by 80 mm or more and 100 mm or less.
　また、拘束ロール７によって金属板５を押し込み、拘束ロール７に金属板５を巻き付けるように通板することが望ましい。金属板５を押し込むことにより、矯正力を高めることができる。１個の拘束ロール７による押し込み量は、図１及び図２のように金属板５が直線状に通板される場合を基準（０ｍｍ）とした場合に、水平方向に０ｍｍ以上２．５ｍｍ以下とすることが好ましい。０．５ｍｍ以上１．０ｍｍ以下とすることがより好ましい。 Also, it is desirable to push the metal plate 5 with the restraint roll 7 and pass the metal plate 5 around the restraint roll 7 so as to wind it. By pushing in the metal plate 5, the correction force can be increased. The pushing amount by one restraint roll 7 is 0 mm or more and 2.5 mm or less in the horizontal direction when the reference (0 mm) is the case where the metal plate 5 is linearly threaded as shown in FIGS. 1 and 2. It is preferable that More preferably, it is 0.5 mm or more and 1.0 mm or less.
　金属板５は、拘束ロール７を通過した後に、出側ノズルユニット３４ｂ、４４ｂの間隙を通過する。この際にも、出側ノズルユニット３４ｂ、４４ｂに設けられたノズル１４、２４によって金属板５の表裏面に水が噴出される。
　図１の例では、入側ノズルユニット３４ａ、４４ａと出側ノズルユニット３４ｂ、４４ｂが、拘束ロール７を上下から挟むように設けられており、拘束ロール７と重なる高さにはノズルユニット及びノズルが設けられていない。このような例では、入側ノズルユニット３４ａ、４４ａの最も出側に位置するノズル１４ａ、２４ａと、出側ノズルユニット３４ｂ、４４ｂの最も入側に位置するノズル１４ｂ、２４ｂが、拘束ロール７に隣接するノズルとなる。上記の隣接するノズルを以下「隣接ノズル」と称することがある。 After passing through the constraining roll 7, the metal plate 5 passes through the gap between the outlet nozzle units 34b and 44b. Also at this time, water is jetted to the front and back surfaces of the metal plate 5 by the nozzles 14 and 24 provided in the outlet nozzle units 34b and 44b.
In the example of FIG. 1, the inlet- side nozzle units 34a and 44a and the outlet- side nozzle units 34b and 44b are provided so as to sandwich the constraining roll 7 from above and below, and the height of the constraining roll 7 and the nozzle unit and the nozzles Is not provided. In such an example, the nozzles 14a and 24a located on the most outlet side of the inlet side nozzle units 34a and 44a and the nozzles 14b and 24b located on the most inlet side of the outlet side nozzle units 34b and 44b are attached to the restraining roll 7. It becomes an adjacent nozzle. The above adjacent nozzles may be referred to as "adjacent nozzles" hereinafter.
　前記隣接ノズルは、水平ではなく、ノズルの開口部が水平面から拘束ロール７の方へと向くように、傾斜して設けられる。すなわち、前記隣接ノズルは、金属板５に対して垂直方向から拘束ロール７の方へ傾斜している。より具体的には、図２における隣接ノズル１４ａ、２４ａは、下方向に傾けて取り付けられ、隣接ノズル１４ｂ、２４ｂは、上方向に傾けて取り付けられる。このように隣接ノズルを傾けると、隣接ノズルを水平となるように設けるのに比べて、隣接ノズルから噴出された水を、拘束ロール７と金属板５との接触点により近い位置まで到達させることができる。これにより、拘束ロール７の近傍でノズルから噴出された水が金属板５の表裏面に接触しにくいことに起因する、拘束ロール７近傍での金属板５に対する冷却能力の低下を防止することができる。 The adjacent nozzles are not horizontal but are installed so as to be inclined so that the nozzle openings face from the horizontal plane toward the constraining roll 7. That is, the adjacent nozzles are inclined from the direction perpendicular to the metal plate 5 toward the restraining roll 7. More specifically, the adjacent nozzles 14a and 24a in FIG. 2 are attached while being inclined downward, and the adjacent nozzles 14b and 24b are attached while being inclined upward. Inclining the adjacent nozzles in this way allows the water ejected from the adjacent nozzles to reach a position closer to the contact point between the constraining roll 7 and the metal plate 5, as compared with the case where the adjacent nozzles are provided horizontally. You can As a result, it is possible to prevent the cooling ability of the metal plate 5 near the constraining roll 7 from being lowered due to the fact that the water ejected from the nozzle near the constraining roll 7 does not easily contact the front and back surfaces of the metal plate 5. it can.
　図１及び図２の例では、隣接ノズル以外の他のノズルについても、全て隣接ノズルと同じ方向に傾けて設けているが、隣接ノズル以外のノズルは従来通り水平に設けていてもよい。ただし、金属板５における水の接触位置をなるべく均一にするという観点からは、各ノズルユニットにおける全てのノズルを同じ方向に同じ角度だけ傾けることが好ましい。 In the example of FIGS. 1 and 2, all the nozzles other than the adjacent nozzles are also tilted in the same direction as the adjacent nozzles, but the nozzles other than the adjacent nozzles may be horizontally provided as before. However, from the viewpoint of making the contact position of water on the metal plate 5 as uniform as possible, it is preferable to incline all the nozzles in each nozzle unit in the same direction by the same angle.
　図２のように、隣接ノズルの傾斜角度としては、隣接ノズルの軸線方向（液体噴出方向（水の噴出方向））と金属板とのなす角度のうち、鋭角となる角度θを設定することができる。尚、水は一定の広がりをもってノズルから吐出されるが、前記水の噴出方向としてはノズルから吐出された水の中心軸線の方向を採用することができる。
　角度θは、隣接ノズルからの水の噴出量、隣接ノズルの開口部と拘束ロール７との距離、隣接ノズルの開口部と金属板５の表裏面との距離等に応じて設定することができる。角度θの好適例としては、２０°以上６０°以下が挙げられる。角度θが２０°以上６０°以下であれば、隣接ノズルから噴出された水の流れが拘束ロール７と金属板５との接触位置のより近傍まで到達し、拘束ロール７近傍での金属板５に対する冷却速度低下を抑制する効果が十分に得られる。
　また、角度θを３０°以上４５°以下とすることがさらに好ましい。尚、ノズルを傾斜させる際には、ノズルから水を斜めに噴射できるように、少なくともノズルの先端を傾斜させていればよい。 As shown in FIG. 2, the inclination angle of the adjacent nozzle may be set to an acute angle θ among the angles formed by the axial direction of the adjacent nozzle (liquid ejection direction (water ejection direction)) and the metal plate. it can. Although water is discharged from the nozzle with a certain spread, the direction of the central axis of the water discharged from the nozzle can be adopted as the jetting direction of the water.
The angle θ can be set according to the amount of water jetted from the adjacent nozzle, the distance between the opening of the adjacent nozzle and the restraint roll 7, the distance between the opening of the adjacent nozzle and the front and back surfaces of the metal plate 5, and the like. . A preferable example of the angle θ is 20 ° or more and 60 ° or less. If the angle θ is 20 ° or more and 60 ° or less, the flow of water ejected from the adjacent nozzle reaches the vicinity of the contact position between the restraint roll 7 and the metal plate 5, and the metal plate 5 near the restraint roll 7 is reached. It is possible to sufficiently obtain the effect of suppressing the decrease in the cooling rate.
Further, it is more preferable that the angle θ is 30 ° or more and 45 ° or less. When inclining the nozzle, at least the tip of the nozzle may be inclined so that water can be jetted obliquely from the nozzle.
　また、本発明に係る焼入れ装置は、金属板５の搬送方向に沿って一体として形成された、非分割型のノズルユニットを備えていてもよい。
　図示していないが、噴出装置４における各ノズルは、ポンプを途中に設けた配管に接続される。ポンプによって、水槽１内の水２が配管内を汲み上げられて、ノズル１４、２４へと圧送されることにより、ノズル１４、２４の開口部から高圧水が噴出される。 Further, the quenching device according to the present invention may include a non-divided nozzle unit integrally formed along the transport direction of the metal plate 5.
Although not shown, each nozzle in the ejection device 4 is connected to a pipe provided with a pump in the middle. By the pump, the water 2 in the water tank 1 is pumped up in the pipe and pressure-fed to the nozzles 14 and 24, whereby high-pressure water is ejected from the openings of the nozzles 14 and 24.
　また、水槽１内の水２は、焼入れに適した水温となるように維持される。水槽１内の水２の一部が、外部のクーリングタワー等の冷却設備に送られて冷却された後に、冷却後の水２が水槽１へと戻されることで、水槽１内の水温上昇が防止される。例えば、水槽１内の水温としては、０℃超５０℃以下が好ましく、１０℃以上４０℃以下が特に好ましい。 Also, the water 2 in the water tank 1 is maintained at a water temperature suitable for quenching. Part of the water 2 in the water tank 1 is sent to a cooling facility such as an external cooling tower to be cooled, and then the cooled water 2 is returned to the water tank 1 to prevent an increase in the water temperature in the water tank 1. To be done. For example, the water temperature in the water tank 1 is preferably more than 0 ° C and 50 ° C or less, and particularly preferably 10 ° C or more and 40 ° C or less.
　そして、本発明の一実施形態に係る焼入れ装置では、従来の拘束ロールとは異なった拘束ロールを備えている。 Then, the quenching apparatus according to the embodiment of the present invention is provided with a constraining roll different from the conventional constraining roll.
　図５は、従来の拘束ロール７（７Ｘ）を横から見た図である。拘束ロール７Ｘを使用すると、拘束ロール７と金属板５は板幅方向全面で接触することになり、拘束ロール７の隣接ノズルから噴出された水の逃げ場が板幅方向にしかなく、金属板５の中央部に衝突した水は横流れする。そのため、金属板５上における冷却速度は、金属板５の中央部よりもエッジ部の方が高くなる傾向がある。 FIG. 5 is a side view of the conventional restraint roll 7 (7X). When the restraint roll 7X is used, the restraint roll 7 and the metal plate 5 come into contact with each other in the entire plate width direction, and the escape area of the water ejected from the adjacent nozzle of the restraint roll 7 is only in the plate width direction. The water that collides with the central part of the river flows laterally. Therefore, the cooling rate on the metal plate 5 tends to be higher in the edge portion than in the central portion of the metal plate 5.
　これに対して、図３は、本発明の一実施形態における拘束ロール７（７Ａ）を横から見た図であり、図４は、本発明の一実施形態における他の拘束ロール７（７Ｂ）を横から見た図である。 On the other hand, FIG. 3 is a side view of the restraint roll 7 (7A) according to the embodiment of the present invention, and FIG. 4 is another restraint roll 7 (7B) according to the embodiment of the present invention. It is the figure which looked at from the side.
　図３及び図４の例では、拘束ロール７Ａ、７Ｂのロール表面に拘束ロールの軸を囲う輪形の溝７ａが設けられており、拘束ロール７Ａ、７Ｂと金属板５は金属板５の板幅方向全面では接触しないことになる。そのため、拘束ロール７Ａ、７Ｂの隣接ノズルから噴出された水の逃げ場が、金属板５の板幅方向だけではなく通板方向にも存在し、金属板５の中央部に衝突した水は横流れだけでなく、縦流れもするようになる。すなわち、溝７ａは、隣接するノズルから噴出された水を金属板５の通板方向（金属板５の長手方向）に逃がして、金属板５のエッジ部に向かう横流れを抑制する働きをする。従って、金属板５上における冷却速度は、金属板５の中央部とエッジ部で差が無く、板幅方向で均一になる。 In the example of FIG. 3 and FIG. 4, a ring-shaped groove 7a that surrounds the axis of the constraining rolls is provided on the roll surfaces of the constraining rolls 7A and 7B, and the constraining rolls 7A and 7B and the metal plate 5 have a plate width of the metal plate 5. There is no contact in the entire direction. Therefore, the escape area of water ejected from the adjacent nozzles of the restraint rolls 7A and 7B exists not only in the plate width direction of the metal plate 5 but also in the plate passing direction, and the water that collides with the central portion of the metal plate 5 has only a lateral flow. Not only that, it also starts to flow vertically. That is, the groove 7 a releases water ejected from the adjacent nozzles in the sheet passing direction of the metal plate 5 (longitudinal direction of the metal plate 5) and suppresses a lateral flow toward the edge portion of the metal plate 5. Therefore, the cooling rate on the metal plate 5 is uniform in the plate width direction without any difference between the central part and the edge part of the metal plate 5.
　溝７ａの形状は、図３の拘束ロール７Ａのように、輪形を含む平面が拘束ロールの軸線方向に対して垂直でも良いし、図４の拘束ロール７Ｂのように、輪形を含む平面が拘束ロールの軸線方向に対して斜めでも良い。図４の拘束ロール７Ｂのように拘束ロールの軸線方向に対して斜めの場合には、金属板５の表面性状をより良好な状態に保つことができるため、より好ましい。
　輪形の溝７ａの幅（拘束ロール７の軸線方向に沿った一辺）は、１０ｍｍ以上５０ｍｍ以下が好ましく、１０ｍｍ以上３０ｍｍ以下がより好ましく、１５ｍｍ以上２５ｍｍ以下が更に好ましい。
　輪形の溝７ａの深さは、５ｍｍ以上３０ｍｍ以下が好ましく、５ｍｍ以上１５ｍｍ以下がより好ましく、８ｍｍ以上１２ｍｍ以下が更に好ましい。拘束ロール７の軸線方向に沿った溝７ａ同士の間隔は、５０ｍｍ以上２００ｍｍ以下であることが好ましく、５０ｍｍ以上１５０ｍｍ以下がより好ましく、７５ｍｍ以上１２５ｍｍ以下が更に好ましい。ここで、溝７ａ同士の間隔とは、隣り合う溝の端の間の距離とする。 As for the shape of the groove 7a, a plane including a ring shape may be perpendicular to the axial direction of the binding roll as in the binding roll 7A in FIG. 3, or a plane including a ring may be bound as in the binding roll 7B in FIG. It may be oblique with respect to the axial direction of the roll. When the restraint roll 7B is inclined with respect to the axial direction of the restraint roll 7B as shown in FIG. 4, the surface quality of the metal plate 5 can be maintained in a better state, which is more preferable.
The width of the annular groove 7a (one side along the axial direction of the restraint roll 7) is preferably 10 mm or more and 50 mm or less, more preferably 10 mm or more and 30 mm or less, and further preferably 15 mm or more and 25 mm or less.
The depth of the ring-shaped groove 7a is preferably 5 mm or more and 30 mm or less, more preferably 5 mm or more and 15 mm or less, and further preferably 8 mm or more and 12 mm or less. The interval between the grooves 7a along the axial direction of the constraining roll 7 is preferably 50 mm or more and 200 mm or less, more preferably 50 mm or more and 150 mm or less, and further preferably 75 mm or more and 125 mm or less. Here, the interval between the grooves 7a is the distance between the ends of the adjacent grooves.
　なお、図示していないが、溝７ａの形状は拘束ロールの軸を中心とする螺旋状であってもよい。螺旋状の溝の場合は、幅が１０ｍｍ以上５０ｍｍ以下で、深さが５ｍｍ以上３０ｍｍ以下で、拘束ロール７の軸線方向に沿った一周前の溝との間隔が５０ｍｍ以上２００ｍｍ以下であることが好ましい。
　螺旋状の溝の場合も、溝の形状のより好ましい範囲や更に好ましい範囲は拘束ロール７Ａ同様である。
　そして、金属板と拘束ロールのスリップを抑えるために、拘束ロール７を駆動ロールとすることが好ましい。さらに、金属板５の矯正力を調整するために、拘束ロール７は、必要に応じて開閉可能（金属板５に対する押し込み量を制御可能）とすることが好ましい。 Although not shown, the groove 7a may have a spiral shape centered on the axis of the constraining roll. In the case of a spiral groove, the width may be 10 mm or more and 50 mm or less, the depth may be 5 mm or more and 30 mm or less, and the interval between the groove one round before along the axial direction of the restraint roll 7 may be 50 mm or more and 200 mm or less. preferable.
Also in the case of the spiral groove, the more preferable range and the more preferable range of the shape of the groove are the same as those of the constraining roll 7A.
Then, in order to suppress the slip between the metal plate and the restraint roll, it is preferable that the restraint roll 7 be a drive roll. Further, in order to adjust the correction force of the metal plate 5, it is preferable that the restraint roll 7 can be opened and closed (the amount of pushing into the metal plate 5 can be controlled) as necessary.
　拘束ロール７は、熱伝導率に優れるとともに、金属板５の挟圧時における荷重に耐えられる強度を備えた材質で形成されていればよい。拘束ロール７の材質としては、例えば、ＳＵＳ３０４、ＳＵＳ３１０、セラミック等が挙げられる。 The restraint roll 7 may be formed of a material having excellent thermal conductivity and strength enough to withstand the load when the metal plate 5 is pinched. Examples of the material of the constraining roll 7 include SUS304, SUS310, and ceramics.
　上記のような本発明の実施形態に係る焼入れ装置及びそれを用いた焼入れ方法は、鋼板の製造に適用することができ、高強度冷延鋼板（ハイテン）の製造方法に適用することが特に好ましい。より具体的には、引張強度が５８０ＭＰａ以上である鋼板の製造方法に適用することが好ましい。引張強度の上限は特に制限されないが、一例として１６００ＭＰａ以下であればよい。ハイテンの製造時には、鋼板を急速に冷却することで、緻密な組織制御を行うことが重要となる。この実施形態を適用することで、焼入れ時に発生する形状不良を抑制しつつ、拘束ロール７近傍での冷却速度の低下を防ぎながら、板幅方向の冷却速度を均一にし、確実に所望の強度のハイテンを製造することができる。 The quenching apparatus and the quenching method using the quenching apparatus according to the embodiment of the present invention as described above can be applied to the production of a steel sheet, and particularly preferably applied to the method for producing a high-strength cold-rolled steel sheet (high tensile strength steel sheet). . More specifically, it is preferably applied to a method for manufacturing a steel sheet having a tensile strength of 580 MPa or more. The upper limit of the tensile strength is not particularly limited, but may be 1600 MPa or less as an example. During the production of high tensile strength steel, it is important to control the structure precisely by rapidly cooling the steel sheet. By applying this embodiment, while suppressing the defective shape that occurs at the time of quenching and preventing the cooling rate from decreasing in the vicinity of the constraining rolls 7, the cooling rate in the plate width direction is made uniform and the desired strength is ensured. High ten can be manufactured.
　高強度冷延鋼板の組成の具体例として、質量％で、Ｃが０．０４％以上０．２５％以下、Ｓｉが０．０１％以上２．５０％以下、Ｍｎが０．８０％以上３．７０％以下、Ｐが０．００１％以上０．０９０％以下、Ｓが０．０００１％以上０．００５０％以下、ｓｏｌ．Ａｌが０．００５％以上０．０６５％以下、必要に応じて、Ｃｒ、Ｍｏ、Ｎｂ、Ｖ、Ｎｉ、Ｃｕ、及びＴｉの少なくとも１種以上がそれぞれ０．５％以下、さらに必要に応じて、Ｂ、Ｓｂがそれぞれ０．０１％以下、残部がＦｅ及び不可避的不純物からなる例が挙げられる。
　尚、本発明の実施形態は、鋼板を急冷する例に限定されるものではなく、鋼板以外の金属板全般の急冷に適用することができ、また、水以外の液体を用いた焼入れにも適用することができる。 As a specific example of the composition of the high-strength cold-rolled steel sheet, C is 0.04% or more and 0.25% or less, Si is 0.01% or more and 2.50% or less, and Mn is 0.80% or more and 3% by mass. .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, and if necessary, at least one kind 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 inevitable impurities.
The embodiment of the present invention is not limited to an example of rapidly cooling a steel sheet, but can be applied to the rapid cooling of all metal sheets other than the steel sheet, and is also applied to quenching using a liquid other than water. can do.
　以下に、実施例を用いて本発明についてより具体的に説明する。 The present invention will be described in more detail below using examples.
　（本発明例１）
　板厚１．０ｍｍ、板幅１０００ｍｍで引張強さ１４７０ＭＰａ級の高張力冷延鋼板を製造する際に、図１～３に示した焼入れ装置および拘束ロール７Ａを用いて、通板速度１．０ｍ／ｓで焼入れを行った。尚、噴出装置４においてノズル１４、２４を傾斜させる角度θは、全て３０°とした。ここで、拘束ロール７Ａの中心軸は通板方向に８０ｍｍずらして配置し、拘束ロール７Ａの金属板５への押し込み量は全て０．５ｍｍとした。また、溝７ａは、幅が２０ｍｍで、深さが１０ｍｍで、溝７ａ同士の間隔が１００ｍｍとした。 (Invention Example 1)
When manufacturing a high-strength cold-rolled steel sheet having a sheet thickness of 1.0 mm, a sheet width of 1000 mm, and a tensile strength of 1470 MPa class, the quenching apparatus and the restraint roll 7A shown in FIGS. / S was quenched. In addition, the angles θ at which the nozzles 14 and 24 are inclined in the ejection device 4 are all 30 °. Here, the central axis of the constraining roll 7A was arranged so as to be displaced by 80 mm in the sheet passing direction, and the pushing amount of the constraining roll 7A into the metal plate 5 was all 0.5 mm. Further, the groove 7a has a width of 20 mm, a depth of 10 mm, and an interval between the grooves 7a is 100 mm.
　また、焼入れ装置に通板中の鋼板の温度を測定した。具体的には、熱電対型の温度計を用いて、鋼板の被測定領域の温度を経時的に測定した。尚、鋼板の冷却開始温度（噴出装置４に入る直前の温度）は７４０℃であり、冷却終了温度（水槽１から出た直後の温度）は３０℃であった。冷却開始後の経過時間と鋼板の温度との関係から、鋼板が拘束ロール７Ａに接触している瞬間の、鋼板の板幅方向の冷却速度分布を計算した。結果を図６に示す。 Also, the temperature of the steel plate being passed through the quenching device was measured. Specifically, the temperature of the measured region of the steel sheet was measured with time using a thermocouple-type thermometer. The cooling start temperature of the steel sheet (the temperature immediately before entering the jetting device 4) was 740 ° C, and the cooling end temperature (the temperature immediately after leaving the water tank 1) was 30 ° C. From the relationship between the elapsed time after the start of cooling and the temperature of the steel sheet, the cooling rate distribution in the sheet width direction of the steel sheet at the moment when the steel sheet was in contact with the restraint roll 7A was calculated. Results are shown in FIG.
　また、通板後に鋼板の反り量を測定した。具体的には、鋼板を搬送方向から正対して見た図１２を用いて説明する。鋼板に反りが発生すると、鋼板の幅方向において高さの高い部分と低い部分とが形成される。通板後の鋼板において、最も高さの高い部分と、最も高さの低い部分との高さの差を反り量として測定した。 Also, the amount of warp of the steel plate was measured after passing the plate. Specifically, a description will be given with reference to FIG. 12 in which the steel sheet is viewed from the conveying direction. When the steel plate warps, a high-height portion and a low-height portion are formed in the width direction of the steel sheet. In the steel sheet after passing, the difference in height between the highest portion and the lowest portion was measured as the amount of warpage.
（本発明例２）
　拘束ロール７Ａの溝７ａを、幅が１０ｍｍで、深さが５ｍｍで、溝７ａ同士の間隔を２００ｍｍとしたこと以外は、本発明例１と同様にして実験を行った。結果を図７に示す。 (Invention Example 2)
An experiment was performed in the same manner as in Example 1 of the present invention, except that the width of the groove 7a of the restraint roll 7A was 10 mm, the depth was 5 mm, and the distance between the grooves 7a was 200 mm. The results are shown in Fig. 7.
　（比較例１）
　特許文献４に記載の焼入れ装置と図５に示した拘束ロール７Ｘを用いたこと以外は、本発明例１と同様にして実験を行った。結果を図８に示す。 (Comparative Example 1)
An experiment was conducted in the same manner as Example 1 of the present invention, except that the quenching device described in Patent Document 4 and the restraining roll 7X shown in FIG. 5 were used. The results are shown in Fig. 8.
　（比較例２）
　特許文献３に記載の焼入れ装置と図５に示した拘束ロール７Ｘを用いたこと以外は、本発明例１と同様にして実験を行った。尚、隣接ノズルの傾斜角度は９０°であった。結果を図９に示す。 (Comparative example 2)
An experiment was conducted in the same manner as Example 1 of the present invention, except that the quenching device described in Patent Document 3 and the restraint roll 7X shown in FIG. 5 were used. The inclination angle of the adjacent nozzle was 90 °. The results are shown in Fig. 9.
　（比較例３）
　拘束ロール７Ａの溝７ａを、幅が５ｍｍで、深さが２ｍｍで、溝７ａ同士の間隔を３００ｍｍとしたこと以外は、本発明例１と同様にして実験を行った。結果を図１０に示す。 (Comparative example 3)
An experiment was conducted in the same manner as in Example 1 of the present invention, except that the groove 7a of the restraint roll 7A had a width of 5 mm, a depth of 2 mm, and an interval between the grooves 7a of 300 mm. The results are shown in Fig. 10.
　＜冷却速度の評価＞
　図６、７（本発明例１、２）では、鋼板の板幅方向の冷却速度分布は、板幅位置によらずほぼ一定であり、ほぼ均一に冷却されている。冷却速度は１５００℃／ｓであった。
　一方、図８（比較例１）では、中央部よりもエッジ部の方が冷却速度が高くなり、不均一に冷却されている。冷却速度は中央部が１５００℃／ｓでエッジは２０００℃／ｓであった。
　同様に、図９（比較例２）では、中央部よりもエッジ部の方が冷却速度が高くなり、不均一に冷却されている。冷却速度は中央部が９００℃／ｓでエッジは１２００℃／ｓであり、図６と中央部で比較すると冷却速度が約４０％（１５００℃／ｓから９００℃／ｓ）低下している。
　図１０（比較例３）では、中央部よりもエッジ部の方が冷却速度が高くなり、不均一に冷却されている。冷却速度は中央部が１５００℃／ｓでエッジは１７００℃／ｓであった。
　鋼板の板幅中央部とエッジ部の冷却速度に、１００℃以上の差がある場合は、不均一性が生じた。
　これにより、本発明を適用することで、拘束ロール近傍における金属板の冷却速度の低下を抑えつつ、板幅方向の冷却速度の不均一性を防止できることが示された。 <Evaluation of cooling rate>
In FIGS. 6 and 7 (Examples 1 and 2 of the present invention), the cooling rate distribution of the steel plate in the plate width direction is substantially constant regardless of the plate width position, and the steel plate is cooled substantially uniformly. The cooling rate was 1500 ° C / s.
On the other hand, in FIG. 8 (Comparative Example 1), the cooling speed is higher in the edge portion than in the central portion, and the cooling is uneven. The cooling rate was 1500 ° C./s at the center and 2000 ° C./s at the edges.
Similarly, in FIG. 9 (Comparative Example 2), the cooling speed is higher in the edge portion than in the central portion, and the cooling is uneven. The cooling rate is 900 ° C./s at the central portion and 1200 ° C./s at the edge, and the cooling rate is reduced by about 40% (1500 ° C./s to 900 ° C./s) compared with FIG. 6 in the central portion.
In FIG. 10 (Comparative Example 3), the cooling speed is higher in the edge portion than in the central portion, and the cooling is uneven. The cooling rate was 1500 ° C./s at the center and 1700 ° C./s at the edges.
When there was a difference of 100 ° C. or more in the cooling rate between the central portion and the edge portion of the steel sheet, nonuniformity occurred.
As a result, it was shown that by applying the present invention, it is possible to prevent the cooling rate of the metal plate in the vicinity of the constraining roll from being reduced and prevent the cooling rate from being uneven in the plate width direction.
　＜引張強度の評価＞
　本発明例１、２によって製造された鋼板の引張強度は、板幅方向全域で約１４７０ＭＰａであった。
　これに対し、比較例１によって製造された鋼板の引張強度は、板幅中央部は約１４７０ＭＰａであったが、エッジ部は約１５５０ＭＰａであり、引張強度の不均一性が見られた。
　また、比較例２によって製造された鋼板の引張強度は、板幅中央部は約１３５０ＭＰａで、エッジ部は約１４００ＭＰａであり、引張強度の低下と不均一性が見られた。
　また、比較例３によって製造された鋼板の引張強度は、板幅中央部は約１４７０ＭＰａであったが、エッジ部は約１５２０ＭＰａであり、引張強度の不均一性が見られた。
　鋼板の板幅中央部とエッジ部の引張強度に３０ＭＰａ以上の差がある場合は、引張強度の不均一性があると判断した。
　これにより、本発明を適用することで、拘束ロール近傍での冷却速度の低下や不均一性に伴う、鋼板の特性低下や不均一性を防止することができることが示された。 <Evaluation of tensile strength>
The tensile strength of the steel sheets manufactured according to Inventive Examples 1 and 2 was about 1470 MPa in the entire widthwise direction.
On the other hand, the tensile strength of the steel sheet manufactured in Comparative Example 1 was about 1470 MPa in the central portion of the plate width, but was about 1550 MPa at the edge portion, showing uneven tensile strength.
In addition, the tensile strength of the steel sheet manufactured in Comparative Example 2 was about 1350 MPa at the center of the sheet width and about 1400 MPa at the edge portion, showing a decrease in tensile strength and nonuniformity.
The tensile strength of the steel sheet produced in Comparative Example 3 was about 1470 MPa in the central portion of the sheet width, but about 1520 MPa at the edge portion, and uneven tensile strength was observed.
When there was a difference of 30 MPa or more in the tensile strength between the central portion and the edge portion of the steel sheet, it was determined that the tensile strength was non-uniform.
From this, it is shown that by applying the present invention, it is possible to prevent the deterioration or non-uniformity of the characteristics of the steel sheet due to the decrease or non-uniformity of the cooling rate in the vicinity of the constraining rolls.
　＜反り量の評価＞
　本発明例１、２及び比較例１、２、３において測定した鋼板の反り量の結果を図１１に示す。
　本発明例１、２及び比較例１、２、３では、ともに鋼板の反り量は同程度であり、本発明のように拘束ロールに溝を備えていても、焼入れ時の鋼板の変形を防止できることが確認された。 <Evaluation of warp amount>
The results of the amounts of warpage of the steel sheets measured in Inventive Examples 1 and 2 and Comparative Examples 1, 2 and 3 are shown in FIG.
In each of Inventive Examples 1 and 2 and Comparative Examples 1, 2, and 3, the warpage amount of the steel sheet is about the same, and even if the restraint roll is provided with the groove as in the present invention, the deformation of the steel sheet during quenching is prevented. It was confirmed that it was possible.
　本発明によって、焼入れ時に金属板に発生する形状不良を抑制しつつ、金属板の冷却速度の低下を抑えながら、金属板の板幅方向の冷却速度を均一にすることができる、焼入れ装置、焼入れ方法及び前記焼入れ方法を用いる鋼板の製造方法を提供することが可能である。 According to the present invention, while suppressing a defective shape that occurs in a metal plate during quenching, while suppressing a decrease in cooling rate of the metal plate, it is possible to make the cooling rate in the plate width direction uniform, a quenching device, quenching It is possible to provide a method and a method for manufacturing a steel sheet using the quenching method.
１　　　　　　　　水槽
２　　　　　　　　水
３　　　　　　　　シールロール
４　　　　　　　　噴出装置
５　　　　　　　　金属板
６　　　　　　　　シンクロール
７　　　　　　　　拘束ロール
７Ａ　　　　　　　拘束ロール
７Ｂ　　　　　　　拘束ロール
７Ｘ　　　　　　　拘束ロール
７ａ　　　　　　　溝
１４、２４　　　　ノズル
１４ａ、２４ａ　　隣接ノズル
１４ｂ、２４ｂ　　隣接ノズル
３４、４４　　　　ノズルユニット
３４ａ、４４ａ　　入側ノズルユニット
３４ｂ、４４ｂ　　出側ノズルユニット 1 Water Tank 2 Water 3 Seal Roll 4 Spouting Device 5 Metal Plate 6 Sink Roll 7 Restraint Roll 7A Restraint Roll 7B Restraint Roll 7X Restraint Roll 7a Groove 14, 24 Nozzle 14a, 24a Adjacent Nozzle 14b, 24b Adjacent Nozzle 34, 44 Nozzle Unit 34a , 44a Inlet nozzle unit 34b, 44b Outlet nozzle unit

Claims (9)

  1. 　高温の金属板を浸漬させる液体を収容した槽と、
    　少なくとも一部が前記槽の液体中に設けられ、前記金属板の両面に前記液体を噴射する複数のノズルを備えた噴出装置と、
    　前記噴出装置の入側端部と出側端部との間に設けられ、前記金属板を両面から挟みつける拘束ロールとを備え、
    　前記噴出装置は、少なくとも前記拘束ロールに隣接するノズルが、前記金属板に対して垂直方向から前記拘束ロールの方へ傾斜しており、
    　前記拘束ロールが、ロール表面に、前記隣接するノズルから噴出された液体を前記金属板の長手方向に逃がす溝を有する、焼入れ装置。     A bath containing a liquid for immersing a high-temperature metal plate,
    At least a part is provided in the liquid of the tank, a jetting device including a plurality of nozzles for jetting the liquid on both surfaces of the metal plate,
    A restraint roll that is provided between an inlet side end and an outlet side end of the ejection device and that holds the metal plate from both sides,
    In the ejection device, at least the nozzle adjacent to the restraint roll is inclined from the direction perpendicular to the metal plate toward the restraint roll,
    A quenching apparatus in which the constraining roll has a groove on the roll surface that allows the liquid ejected from the adjacent nozzle to escape in the longitudinal direction of the metal plate.
  2. 　前記溝が前記拘束ロールの軸を囲う輪形であり、前記輪形を含む平面が前記拘束ロールの軸に対して垂直である、請求項１に記載の焼入れ装置。 The quenching device according to claim 1, wherein the groove has a ring shape surrounding the axis of the constraining roll, and a plane including the ring shape is perpendicular to the axis of the constraining roll.
  3. 　前記溝が前記拘束ロールの軸を囲う輪形であり、前記輪形を含む平面が前記拘束ロールの軸に対して斜めである、請求項１に記載の焼入れ装置。 The quenching device according to claim 1, wherein the groove has a ring shape surrounding the shaft of the constraining roll, and a plane including the ring shape is oblique with respect to the shaft of the constraining roll.
  4. 　前記溝の幅が１０ｍｍ以上５０ｍｍ以下、深さが５ｍｍ以上３０ｍｍ以下で、前記拘束ロールの軸線方向に沿った溝の間隔が５０ｍｍ以上２００ｍｍ以下である、請求項２または３に記載の焼入れ装置。 The quenching device according to claim 2 or 3, wherein the width of the groove is 10 mm or more and 50 mm or less, the depth is 5 mm or more and 30 mm or less, and the interval between the grooves along the axial direction of the restraining roll is 50 mm or more and 200 mm or less.
  5. 　前記溝が前記拘束ロールの軸を中心とする螺旋状である、請求項１に記載の焼入れ装置。 The quenching device according to claim 1, wherein the groove has a spiral shape around the axis of the restraint roll.
  6. 　前記溝の幅が１０ｍｍ以上５０ｍｍ以下、深さが５ｍｍ以上３０ｍｍ以下で、前記拘束ロールの軸線方向に沿った一周前の溝との間隔が５０ｍｍ以上２００ｍｍ以下である、請求項５に記載の焼入れ装置。 The quenching according to claim 5, wherein the width of the groove is 10 mm or more and 50 mm or less, the depth is 5 mm or more and 30 mm or less, and the distance between the groove and the groove one round before along the axial direction of the restraining roll is 50 mm or more and 200 mm or less. apparatus.
  7. 　前記拘束ロールに隣接するノズルの液体噴出方向と前記金属板の成す角度が２０°以上６０°以下である、請求項１～６のいずれか一項に記載の焼入れ装置。 The quenching apparatus according to any one of claims 1 to 6, wherein an angle formed by the metal plate and a liquid ejection direction of a nozzle adjacent to the restraint roll is 20 ° or more and 60 ° or less.
  8. 　請求項１～７のいずれか一項に記載の焼入れ装置を用いて急冷焼入れを行う、焼入れ方法。 A quenching method in which quenching quenching is performed using the quenching device according to any one of claims 1 to 7.
  9. 　鋼板を製造する際に、請求項８に記載の焼入れ方法を用いる、鋼板の製造方法。
          A method for producing a steel sheet, which comprises using the quenching method according to claim 8 when producing a steel sheet.
PCT/JP2019/041433 2018-10-25 2019-10-23 Quenching device, quenching method, and metal plate production method WO2020085352A1 (en)

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CN114672627A (en) * 2022-03-21 2022-06-28 东北大学 Symmetrical constraint roller type quenching device and quenching method for heat treatment reinforced aluminum alloy plate

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