EP2929949B1 - Dispositif permettant de refroidir une tôle d'acier laminée à chaud - Google Patents

Dispositif permettant de refroidir une tôle d'acier laminée à chaud Download PDF

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Publication number
EP2929949B1
EP2929949B1 EP12873885.3A EP12873885A EP2929949B1 EP 2929949 B1 EP2929949 B1 EP 2929949B1 EP 12873885 A EP12873885 A EP 12873885A EP 2929949 B1 EP2929949 B1 EP 2929949B1
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EP
European Patent Office
Prior art keywords
cooling
hot
steel sheet
rolled steel
temperature
Prior art date
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EP12873885.3A
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German (de)
English (en)
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EP2929949A1 (fr
EP2929949A4 (fr
Inventor
Tooru Akashi
Shingo Kuriyama
Takeo Itoh
Koji Noguchi
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Nippon Steel Corp
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Nippon Steel and Sumitomo Metal Corp
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Publication of EP2929949A1 publication Critical patent/EP2929949A1/fr
Publication of EP2929949A4 publication Critical patent/EP2929949A4/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B21B37/76—Cooling control on the run-out table
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/02—Vertical deviation, e.g. slack, looper height
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips

Definitions

  • the present invention relates to an apparatus for cooling a hot-rolled steel sheet which cools a hot-rolled steel sheet hot-rolled using a finishing mill.
  • An apparatus for cooling hot rolled steel sheet in accordance with the preamble of claim 1 is for example known from EP 2 070 608 A1 .
  • FIG 18 is a view schematically illustrating a method for manufacturing a hot-rolled steel sheet of the related art.
  • a slab S obtained by continuously casting molten steel having an adjusted predetermined composition is rolled using a roughing mill 201, and then, furthermore, hot-rolled using a finishing mill 203 constituted by a plurality of rolling stands 202a to 202d, thereby forming a hot-rolled steel sheet H having a predetermined thickness.
  • the hot-rolled steel sheet H is cooled using cooling water supplied from a cooling apparatus 211, and then coiled into a coil shape using a coiling apparatus 212.
  • the cooling apparatus 211 is generally a facility for carrying out so-called laminar cooling on the hot-rolled steel sheet H transported from the finishing mill 203.
  • the cooling apparatus 211 sprays the cooling water on the top surface of the hot-rolled steel sheet H moving on a run-out table from the top in the vertical direction in a water jet form through a cooling nozzle, and, simultaneously, sprays the cooling water on the bottom surface of the hot-rolled steel sheet H through a pipe laminar in a water jet form, thereby cooling the hot-rolled steel sheet H.
  • Patent Document 1 discloses a technique of the related art which reduces the difference in surface temperature between the top and bottom surfaces of a thick steel sheet, thereby preventing the shape of the steel sheet from becoming defective.
  • the water volume ratio of cooling water supplied to the top surface and the bottom surface of the steel sheet is adjusted based on the difference in surface temperature obtained by simultaneously measuring the surface temperatures of the top surface and the bottom surface of the steel sheet using a thermometer when the steel sheet is cooled using a cooling apparatus.
  • JP H05-337505A discloses a technique that cools a rolled material between two adjacent stands in a finishing mill using a sprayer, thereby beginning and completing the ⁇ - ⁇ transformation of the rolled material so as to prevent sheet-threading performance between the stands from deteriorating.
  • JP 2005-271052A discloses a technique that measures the steepness at the tip of a steel sheet using a steepness meter installed on the exit side of a mill, and prevents the steel sheet from being perforated by adjusting the flow rate of cooling water to be different in the width direction based on the measured steepness.
  • JP 2003-48003A discloses a technique that aims to solve a wave-shaped sheet thickness distribution in the sheet width direction of a hot-rolled steel sheet and to make uniform the sheet thickness in the sheet width direction, and controls the difference between the maximum heat transmissibility and the minimum heat transmissibility in the sheet width direction of the hot-rolled steel sheet to be in a range of predetermined values.
  • the hot-rolled steel sheet H manufactured using the manufacturing method illustrated in FIG. 18 forms a wave shape in the rolling direction (the arrow direction in FIG. 19 ) on transportation rolls 220 in the run-out table (hereinafter sometimes referred to as "ROT") in the cooling apparatus 211 as illustrated in FIG. 19 .
  • the top surface and the bottom surface of the hot-rolled steel sheet H are not uniformly cooled. That is, there was a problem in that, due to cooling deviation caused by the wave shape of the hot-rolled steel sheet H, it became impossible to uniformly cool the steel sheet in the rolling direction.
  • JP H06-328117A discloses a technique that, in a steel sheet formed into a wave shape in the rolling direction, makes uniform the cooling capabilities of top portion cooling and bottom portion cooling so as to minimize the influence of the distance between soaked water on the top portion of the steel sheet and a table roller at the bottom portion in order to uniformly cool the steel sheet.
  • the portions that locally come into contact with the transportation rolls 220 or the aprons become more easily cooled than other portions due to heat dissipation by contact. Therefore, there was a problem in that the hot-rolled steel sheet H was ununiformly cooled. That is, in JP 2005-74463A the fact that the wave shape of the hot-rolled steel sheet causes the hot-rolled steel sheet to locally come into contact with the transportation rolls or the aprons and the contact portions becomes easily cooled due to heat dissipation by contact is not taken into consideration. Therefore, there are cases in which it is impossible to uniformly cool a hot-rolled steel sheet having a wave shape formed as described above.
  • JP H05-337505A s to make (soft) ultra low carbon steel having a relatively low hardness undergo ⁇ - ⁇ transformation between stands in a finishing mill, and does not aim at uniform cooling.
  • the invention of JP H05-337505A does not relate to cooling in a case in which a rolled material has a wave shape in the rolling direction or a rolled material is a steel material that is so-called high tensile strength steel having a tensile strength (TS) of 800 MPa or more, and therefore there is a concern that uniform cooling may not be possible in a case in which a rolled material is a hot-rolled steel sheet having a wave shape or a steel material having a relatively high hardness.
  • TS tensile strength
  • JP 2005-271052A In addition, in the cooling method of JP 2005-271052A the steepness of the steel sheet in the width direction is measured, and the flow rate of cooling water is adjusted in portions having a high steepness. However, when the flow rate of cooling water in the sheet width direction of the steel sheet is changed, it becomes difficult to make uniform the temperature of the steel sheet in the sheet width direction. Furthermore, JP 2005-271052A also does not take a hot-rolled steel sheet having a wave shape in the rolling direction into consideration, and there are cases in which it is not possible to uniformly cool a hot-rolled steel sheet as described above.
  • JP 2003-48003A is the cooling of a hot-rolled steel sheet immediately before roll bites in the finishing mill, and therefore it is not possible to apply the cooling to a hot-rolled steel sheet which has undergone finish-rolling so as to have a predetermined thickness.
  • JP 2003-48003A also does not take a hot-rolled steel sheet having a wave shape in the rolling direction into consideration, and there are cases in which it is not possible to uniformly cool a hot-rolled steel sheet in the rolling direction as described above.
  • the cooling capability of the top portion cooling includes not only cooling by the cooling water supplied to the steel sheet from a top portion water supply nozzle but also cooling by the soaked water in the top portion of the steel sheet. Since the soaked water is influenced by the steepness of the wave shape formed in the steel sheet or the sheet-threading speed of the steel sheet, strictly, it is not possible to specify the cooling capability of the steel sheet due to the soaked water. Thus, it is difficult to accurately control the cooling capability of the top portion cooling. Therefore, it is also difficult to make the cooling capabilities of the top portion cooling and the bottom portion cooling equivalence.
  • the patent document describes an example of a method for determining the cooling capabilities when the cooling capabilities of the top portion cooling and the bottom portion cooling are made uniform, but does not disclose ordinary determination methods. Therefore, in the cooling method of JP H06-328117A there are cases in which it is not possible to uniformly cool a hot-rolled steel sheet.
  • the present invention has been made in consideration of the above problems, and an object of the present invention is to uniformly cool a hot-rolled steel sheet hot-rolled using a finishing mill.
  • the phase of the temperature of a hot-rolled steel sheet is detected, and compared with a wave shape of the hot-rolled steel sheet, it is possible to adjust the top side cooling capability and the bottom side cooling capability, and it is possible to adjust the amount of heat dissipated from the top surface by cooling and the amount of heat dissipated from the bottom surface by cooling of the hot-rolled steel sheet. Therefore, afterwards, when the hot-rolled steel sheet is cooled using the adjusted cooling capabilities, it is possible to uniformly cool the hot-rolled steel sheet.
  • FIG. 1 schematically illustrates an example of a hot rolling facility 1 having the apparatus for cooling a hot-rolled steel sheet in the present embodiment.
  • the hot rolling facility 1 is a facility which aims to sandwich the top and bottom of a heated slab S using rolls, continuously roll the slab to make the slab as thin as a minimum of 1 mm, and coil the slab.
  • the hot rolling facility 1 has a heating furnace 11 for heating the slab S, a width-direction mill 16 that rolls the slab S heated in the heating furnace 11 in a width direction, a roughing mill 12 that rolls the slab S rolled in the width direction from the vertical direction so as to produce a rough bar, a finishing mill 13 that further continuously hot-finishing-rolls the rough bar to a predetermined thickness, a cooling apparatus 14 that cools the hot-rolled steel sheet H hot-finishing-rolled using the finishing mill 13 using cooling water, and a coiling apparatus 15 that coils the hot-rolled steel sheet H cooled using the cooling apparatus 14 into a coil shape.
  • the heating furnace 11 is provided with a side burner, an axial burner and a roof burner that heat the slab S brought from the outside through a charging hole by blowing flame.
  • the slab S brought into the heating furnace 11 is sequentially heated in respective heating areas formed in respective zones, and, furthermore, a heat-retention treatment for enabling transportation at an optimal temperature is carried out by uniformly heating the slab S using the roof burner in a soaking area formed in a final zone.
  • a heating treatment in the heating furnace 11 completely ends, the slab S is transported to the outside of the heating furnace 11, and moved into a rolling process by the roughing mill 12.
  • the roughing mill 12 passes the transported slab S through gaps between columnar rotary rolls provided across a plurality of stands.
  • the roughing mill 12 hot-rolls the slab S only using work rolls 12a provided at the top and bottom of a first stand so as to form a rough bar.
  • the rough bar which has passed through the work rolls 12a is further continuously rolled using a plurality of fourfold mills 12b constituted by a work roll and a back-up roll.
  • the rough bar is rolled into a thickness of approximately 30 mm to 60 mm, and transported to the finishing mill 13.
  • the finishing mill 13 finishing-rolls the rough bar transported from the roughing mill 12 until the thickness becomes approximately several millimeters.
  • the finishing mill 13 passes the rough bar through gaps between top and bottom finish rolling rolls 13a linearly arranged across 6 to 7 stands so as to gradually reduce the rough bar.
  • the hot-rolled steel sheet H finishing-rolled using the finishing mill 13 is transported to the cooling apparatus 14 using the transportation rolls 32 described below.
  • the cooling apparatus 14 is a facility for carrying out so-called laminar cooling on the hot-rolled steel sheet H transported from the finishing mill 13. As illustrated in FIG. 2 , the cooling apparatus 14 has a top side cooling device 14a that sprays cooling water from cooling holes 31 on the top side to the top surface of the hot-rolled steel sheet H moving on the transportation rolls 32 in a run-out table, and a bottom side cooling device 14b that sprays cooling water from cooling holes 31 on the bottom side to the bottom surface of the hot-rolled steel sheet H. A plurality of the cooling holes 31 is provided in the top side cooling device 14a and the bottom side cooling device 14b respectively.
  • a cooling header (not illustrated) is connected to the cooling hole 31.
  • the number of the cooling holes 31 determines the cooling capabilities of the top side cooling device 14a and the bottom side cooling device 14b.
  • the cooling apparatus 14 may be constituted by at least one of top and bottom split laminar, pipe laminar, spray cooling and the like.
  • a section in which the hot-rolled steel sheet H is cooled using the cooling apparatus 14 corresponds to a cooling section in the present invention.
  • thermometer 40 that measures the temperature of a measurement location set in the rolling direction of the hot-rolled steel sheet H and a shape meter 41 that measures the wave shape of the hot-rolled steel sheet H at the same measurement location as the thermometer 40 are disposed as illustrated in FIG. 3 .
  • thermometer 40 and the shape meter 41 are electrically connected to a control device 50 through cables and the like.
  • control device 50 is electrically connected to the top side cooling device 14a and the bottom side cooling device 14b through cables and the like.
  • thermometer 40 outputs the temperature measurement results of the hot-rolled steel sheet H to the control device 50.
  • shape meter 41 outputs the shape measurement results of the hot-rolled steel sheet H to the control device 50.
  • the control device 50 controls at least one of the amount of heat dissipated from the top surface by cooling and the amount of heat dissipated from the bottom surface by cooling of the hot-rolled steel sheet H in the cooling section by controlling the top side cooling device 14a and the bottom side cooling device 14b based on the temperature measurement results obtained from the thermometer 40 and the shape measurement results obtained from the shape meter 41.
  • the control device 50 has an average temperature computation unit 51, a changing speed computation unit 52, a control direction-determining unit 53 and a total amount of heat dissipated by cooling-adjusting unit 54 as functions realized by running of programs. The functions of the respective functional units will be described.
  • the coiling apparatus 15 coils the hot-rolled steel sheet H cooled using the cooling apparatus 14 at a predetermined coiling temperature as illustrated in FIG. 1 .
  • the hot-rolled steel sheet H coiled into a coil shape using the coiling apparatus 15 is transported to the outside of the hot rolling facility 1.
  • the top side cooling device 14a, the bottom side cooling device 14b, the thermometer 40, the shape meter 41 and the control device 50 constitute the apparatus for cooling a hot-rolled steel sheet in the present embodiment.
  • a wave shape having a surface height (wave height) changing in the rolling direction is formed in the hot-rolled steel sheet H hot-rolled using the finishing mill 13 as illustrated in FIG. 19 .
  • the influence of soaked water remaining on the hot-rolled steel sheet H will be ignored when cooling the hot-rolled steel sheet H. Actually, as a result of investigation by the inventors, it has been found that the soaked water remaining on the hot-rolled steel sheet H has little influence.
  • the cooling capability (top side cooling capability) of the top side cooling device 14a and the cooling capability (bottom side cooling capability) of the bottom side cooling device 14b are adjusted respectively in advance.
  • the top side cooling capability and the bottom side cooling capability are adjusted using the heat transfer coefficient of the top surface of the hot-rolled steel sheet H, which is cooled using the top side cooling device 14a, and the heat transfer coefficient of the bottom surface of the hot-rolled steel sheet H, which is cooled using the bottom side cooling device 14b.
  • the temperature difference herein refers to the difference between the temperature of the hot-rolled steel sheet H, which is measured using a thermometer on an entry side of the cooling apparatus 14, and the temperature of cooling water used in the cooling apparatus 14.
  • the computed heat transfer coefficient of the hot-rolled steel sheet H is classified into the heat transfer coefficient of the top surface and the heat transfer coefficient of the bottom surface of the hot-rolled steel sheet H.
  • the heat transfer coefficients of the top surface and the bottom surface are computed using a ratio that is obtained in advance, for example, in the following manner.
  • the heat transfer coefficient of the hot-rolled steel sheet H in a case in which the hot-rolled steel sheet H is cooled only using the top side cooling device 14a and the heat transfer coefficient of the hot-rolled steel sheet H in a case in which the hot-rolled steel sheet H is cooled only using the bottom side cooling device 14b are measured.
  • the amount of cooling water from the top side cooling device 14a and the amount of cooling water from the bottom side cooling device 14b are set to be equal.
  • the inverse number of the ratio between the measured heat transfer coefficient in a case in which the top side cooling device 14a is used and the heat transfer coefficient in a case in which the bottom side cooling device 14b is used becomes a top and bottom ratio of the amount of cooling water from the top side cooling device 14a to the amount of cooling water from the bottom side cooling device 14b in a case in which a top and bottom heat transfer coefficient ratio is set to "1".
  • the above-mentioned ratio of the heat transfer coefficients of the top surface and the bottom surface of the hot-rolled steel sheet H is computed by multiplying the amount of cooling water from the top side cooling device 14a or the amount of cooling water from the bottom side cooling device 14b when cooling the hot-rolled steel sheet H by the top and bottom ratio of the amounts of cooling water obtained in the above manner.
  • the heat transfer coefficients of the hot-rolled steel sheet H cooled only using the top side cooling device 14a and only using the bottom side cooling device 14b are used, but the heat transfer coefficient of the hot-rolled steel sheet H cooled using both the top side cooling device 14a and the bottom side cooling device 14b may be used. That is, the heat transfer coefficients of the hot-rolled steel sheet H in a case in which the amounts of cooling water of the top side cooling device 14a and the bottom side cooling device 14b are changed are measured, and the ratio of the heat transfer coefficients of the top surface and the bottom surface of the hot-rolled steel sheet H may be computed using the ratio of the heat transfer coefficients.
  • the heat transfer coefficients of the hot-rolled steel sheet H are computed, and the heat transfer coefficients of the top surface and the bottom surface of the hot-rolled steel sheet H are computed based on the above ratio of the heat transfer coefficients of the top surface and the bottom surface of the hot-rolled steel sheet H (top and bottom heat transfer coefficient ratio).
  • the inventors further obtained the following findings.
  • the temperature and shape of the hot-rolled steel sheet H in the process of sheet-threading are measured at measurement locations set in the rolling direction of the hot-rolled steel sheet H (hereinafter, the measurement locations will be sometimes referred to as fixed points) using the thermometer 40 and the shape meter 41 at certain time intervals (sampling intervals), and the chronological data of the temperature measurement results and the shape measurement results are obtained.
  • the temperature measurement area using the thermometer 40 includes all the area of the hot-rolled steel sheet H in the width direction.
  • the shape refers to the steepness obtained through the line integration of the heights or changing components of pitches of the wave using the amount of movement of the hot-rolled steel sheet H in the sheet-threading direction as the amount of change of the hot-rolled steel sheet H in the height direction observed in measurement at the fixed point.
  • the amount of change per unit time, that is, changing speed is also obtained.
  • the shape measurement area includes all the areas of the hot-rolled steel sheet H in the width direction.
  • the total value of the amount of heat dissipated from the top surface by cooling and the amount of heat dissipated from the bottom surface by cooling of the hot-rolled steel sheet H is adjusted using the chronological data. Specifically, the total value of the amount of heat dissipated from the top surface by cooling and the amount of heat dissipated from the bottom surface by cooling of the hot-rolled steel sheet H is adjusted so that the chronological average value of the temperatures measured using the thermometer 40 matches a predetermined target value.
  • the on-off control of cooling headers connected to the cooling apparatus 14 may be carried out on a theoretical value obtained in advance using an experimental theoretical formula represented by, for example, Mitsuzuka's formula based on a learned value set to correct the error with an actual operation achievement.
  • the on-off of the cooling headers may be feedback-controlled or feedforward-controlled based on the temperature actually measured using the thermometer 40.
  • FIG. 4 illustrates the relationship between the temperature change and steepness of the hot-rolled steel sheet H during cooling in the ROT of a typical strip in an ordinary operation.
  • the top and bottom heat transfer coefficient ratio of the hot-rolled steel sheet H in FIG. 4 is 1.2:1, and the top side cooling capability is superior to the bottom side cooling capability.
  • the top graph in FIG. 4 indicates the temperature change with respect to the distance from a coil tip or a time at which a coil passes the fixed point
  • the bottom graph in FIG. 4 indicates the steepness with respect to the distance from the coil tip or the time at which the coil passes the fixed point.
  • the area A in FIG. 4 is an area before the strip tip portion illustrated in FIG. 3 is bit in a coiler of the coiling apparatus 15 (since there is no tension, the shape is defective in this area).
  • the area B in FIG. 4 is an area after the strip tip portion is bit in the coiler (the area in which the wave shape is changed to be flat by the influence of unit tension).
  • FIG. 5 illustrates the temperature-changing component with respect to the steepness of the same shape during cooling in the ROT of the typical strip in the ordinary operation.
  • the temperature-change component is a residual error obtained by subtracting the chronological average of the temperature from the actual steel sheet temperature (hereinafter sometimes referred to as "average temperature").
  • the average temperature may be the average of the temperature of a range that is a cycle or more of the wave shape of the hot-rolled steel sheet H.
  • the average temperature is, in principle, the average of the temperature range of the unit cycle. In addition, it is confirmed from operation data that there is no large difference between the average temperature of a range of a cycle and the average temperature of a range of two or more cycles.
  • the average temperature simply needs to be computed from a range of at least a cycle of the wave shape.
  • the upper limit of the range of the wave shape of the hot-rolled steel sheet H is not particularly limited; however, a sufficiently accurate average temperature can be obtained when the range is preferably set to 5 cycles.
  • a permissible average temperature can be obtained even when the average temperature is computed not from a range of the unit cycle but from a range of 2 to 5 cycles.
  • the hot-rolled steel sheet H when upward in the vertical direction (the direction that is perpendicular to the top and bottom surfaces of the hot-rolled steel sheet H) of the hot-rolled steel sheet H is set as positive, in an area with a positive changing speed measured at the fixed point, in a case in which the temperature (the temperature measured at the fixed point) of the hot-rolled steel sheet H is lower than the average temperature of a range of one or more cycles of the wave shape of the hot-rolled steel sheet H, at least one of a direction in which the amount of heat dissipated from the top surface by cooling decreases and a direction in which the amount of heat dissipated from the bottom surface by cooling increases is determined as a control direction, and, in a case in which the temperature of the hot-rolled steel sheet H is higher than the average temperature, at least one of a direction in which the amount of heat dissipated from the top surface by cooling increases and a direction in which the amount of heat dissipated from the bottom surface by cooling decreases is determined as the control direction.
  • At least one of a direction in which the amount of heat dissipated from the top surface by cooling increases and a direction in which the amount of heat dissipated from the bottom surface by cooling decreases is determined as the control direction; and, in a case in which the temperature of the hot-rolled steel sheet H is higher than the average temperature, at least one of a direction in which the amount of heat dissipated from the top surface by cooling decreases and a direction in which the amount of heat dissipated from the bottom surface by cooling increases is determined as the control direction.
  • At least one of a direction in which the amount of heat dissipated from the top surface by cooling decreases and a direction in which the amount of heat dissipated from the bottom surface by cooling increases is determined as the control direction
  • at least one of a direction in which the amount of heat dissipated from the top surface by cooling increases and a direction in which the amount of heat dissipated from the bottom surface by cooling decreases is determined as the control direction.
  • the apparatus for cooling a hot-rolled steel sheet of the present embodiment is to realize the above-described cooling method. That is, the average temperature computation unit 51 in the control device 50 computes the chronological average value of the temperature measurement results obtained from the thermometer 40 in chronological order as the average temperature. In addition, the changing speed computation unit 52 computes the changing speed of the hot-rolled steel sheet H as an average temperature based on the shape measurement results obtained from the shape meter 41 in chronological order.
  • the control direction-determining unit 53 determines at least one of a direction in which the amount of heat dissipated from the top surface by cooling decreases and a direction in which the amount of heat dissipated from the bottom surface by cooling increases as a control direction, and, in a case in which the temperature of the hot-rolled steel sheet H is higher than the average temperature, the control direction-determining unit 53 determines at least one of a direction in which the amount of heat dissipated from the top surface by cooling increases and a direction in which the amount of heat dissipated from the bottom surface by cooling decreases as the control direction.
  • control direction-determining unit 53 determines at least one of the direction in which the amount of heat dissipated from the top surface by cooling increases and the direction in which the amount of heat dissipated from the bottom surface by cooling decreases as the control direction; and, in a case in which the temperature of the hot-rolled steel sheet H is higher than the average temperature, the control direction-determining unit 53 determines at least one of the direction in which the amount of heat dissipated from the top surface by cooling decreases and the direction in which the amount of heat dissipated from the bottom surface by cooling increases as the control direction.
  • cooling-adjusting unit 54 adjusts the total value of the amount of heat dissipated from the top surface by cooling and the amount of heat dissipated from the bottom surface by cooling of the hot-rolled steel sheet H in the cooling section based on the control directions determined as described above.
  • the cooling headers connected to cooling holes 31 in the top side cooling device 14a and the cooling headers connected to cooling holes 31 in the bottom side cooling device 14b may be on-off controlled respectively.
  • the cooling capabilities of the respective cooling headers in the top side cooling device 14a and the bottom side cooling device 14b may be controlled. That is, at least one of the sprayed water density, pressure and water temperature of cooling water sprayed from the respective cooling holes 31 may be adjusted.
  • the flow rate or pressure of cooling water sprayed from the top side cooling device 14a and the bottom side cooling device 14b may be adjusted by thinning out the cooling headers (cooling holes 31) of the top side cooling device 14a and the bottom side cooling device 14b.
  • the cooling headers that constitute the top side cooling device 14a are preferably thinned out.
  • the hot-rolled steel sheet H is uniformly cooled by spraying cooling water onto the top surface of the hot-rolled steel sheet H from the top side cooling device 14a and spraying cooling water onto the bottom surface of the hot-rolled steel sheet H from the bottom side cooling device 14b using the cooling capabilities adjusted as described above.
  • the temperature and shape of the hot-rolled steel sheet H cooled using the cooling apparatus 14 are measured at the same point of the fixed point respectively using the thermometer 40 and the shape meter 41, and the temperature and the shape are measured as chronological data.
  • the temperature measurement area includes all the area of the hot-rolled steel sheet H in the width direction.
  • the shape indicates the amount of change of the hot-rolled steel sheet H in the height direction observed in a measurement at the fixed point.
  • the shape measurement area includes all the area of the hot-rolled steel sheet H in the width direction.
  • the increase and decrease directions (control directions) of the top side cooling capability (amount of heat dissipated from the top surface by cooling) and the bottom side cooling capability (amount of heat dissipated from the bottom surface by cooling) for decreasing the temperature standard deviation are determined, and it is possible to adjust the top and bottom heat transfer coefficient ratio.
  • the top and bottom heat transfer coefficient ratio based on the degree of the temperature standard deviation so that the temperature standard deviation falls into a permissible range, for example, a range of the minimum value to the minimum value+10°C. Meanwhile, when the temperature standard deviation falls into a range of the minimum value to the minimum value+10°C, the variations in yield stress, tensile strength and the like are suppressed within the manufacturing permissible ranges, and the hot-rolled steel sheet H can be uniformly cooled.
  • the temperature standard deviation falls into a range of the minimum value to the minimum value+10°C as long as a sprayed cooling water density ratio is ⁇ 5% or less with respect to the sprayed cooling water density ratio at which the temperature standard deviation becomes the minimum value. That is, in a case in which the sprayed cooling water density is used, the top and bottom ratio of the sprayed cooling water density (sprayed cooling water density ratio) is desirably set to ⁇ 5% or less with respect to the sprayed cooling water density ratio at which the temperature standard deviation becomes the minimum value.
  • the permissible range does not always include the top and bottom sprayed water density.
  • the hot-rolled steel sheet H is cooled by adjusting the cooling capabilities of the top side cooling device 14a and the bottom side cooling device 14b, and then the cooling capability of the top side cooling device 14a and the cooling capability of the bottom side cooling device 14b are further adjusted based on the measurement results of the temperature and wave shape of the cooled hot-rolled steel sheet H. Since the cooling capabilities of the top side cooling device 14a and the bottom side cooling device 14b can be adjusted to be qualitatively and quantitatively appropriate cooling capabilities through feedback control in the above manner, it is possible to further improve the uniformity of the hot-rolled steel sheet H which will be cooled afterwards.
  • the temperature and shape of the hot-rolled steel sheet H are measured at the fixed point at the same measurement location using the thermometer 40 and the shape meter 41; however, as a result of investigation by the inventors, it was found that the measurement locations of the thermometer 40 and the shape meter 41 may not be strictly the same. It was found that, specifically, when the location deviation (distance) L between the temperature measurement place P1 of the thermometer 40 and the shape measurement place P2 of the shape meter 41 on the hot-rolled steel sheet H is 50 mm or less and preferably 30 mm or less as illustrated in FIG. 8 , it is possible to appropriately understand the temperature and shape of the hot-rolled steel sheet H.
  • the direction of the location deviation L between the measurement places of the thermometer 40 and the shape meter 41 may be the sheet-threading direction of the hot-rolled steel sheet H as illustrated in FIG. 8 , may be the sheet thickness direction of the hot-rolled steel sheet H, and may be an arbitrary direction. Meanwhile, in the example of FIG. 8 , the thermometer 40 is disposed on the upstream side of the shape meter 41, conversely, the shape meter 41 may be disposed on the upstream side of the thermometer 40.
  • the temperature measurement place P1 of the thermometer 40 is used as a criterion
  • a location deviation L is indicated using a positive value in a case in which the shape measurement place P2 of the shape meter 41 is set on the downstream side of the temperature measurement place
  • a location deviation L is indicated using a negative value in a case in which the shape measurement place P2 of the shape meter 41 is set on the upstream side of the temperature measurement place.
  • the location deviation L becomes zero.
  • thermometer 40 when the location deviation L between the measurement places of the thermometer 40 and the shape meter 41 is 50 mm or less, similarly to the above embodiment, it is possible to determine the increase and decrease directions (control directions) of the top side cooling capability and the bottom side cooling capability for decreasing the temperature standard deviation, and it is possible to feedback-control the cooling capabilities of the top side cooling device 14a and the bottom side cooling device 14b.
  • the cooling section in which the hot-rolled steel sheet H is cooled may be divided into a plurality of sections, for example, two divided cooling sections Z1 and Z2 in the rolling direction as illustrated in FIG. 9 .
  • Each of the divided cooling sections Z1 and Z2 is provided with the cooling apparatus 14.
  • the thermometer 40 and the shape meter 41 are provided respectively at the border between the respective divided cooling sections Z1 and Z2, that is, on the downstream side of the divided cooling sections Z1 and Z2.
  • the cooling section is divided into two divided cooling sections, but the number of divisions is not limited thereto, and can be arbitrarily set.
  • the cooling section may be divided into 1 to 5 divided cooling sections.
  • the temperature and wave shape of the hot-rolled steel sheet H on the downstream side of the divided cooling sections Z1 and Z2 are respectively measured using the respective thermometers 40 and the respective shape meters 41.
  • the cooling capabilities of the top side cooling device 14a and the bottom side cooling device 14b at the respective divided cooling sections Z1 and Z2 are controlled based on the measurement results.
  • the cooling capabilities are controlled so that the temperature standard deviation of the hot-rolled steel sheet H falls into the permissible range, for example, a range of the minimum value to the minimum value+10°C as described above.
  • the amount of heat dissipated from the top surface by cooling and the amount of heat dissipated from the bottom surface by cooling of the hot-rolled steel sheet H at the respective divided cooling sections Z1 and Z2 is adjusted.
  • the cooling capabilities of the top side cooling device 14a and the bottom side cooling device 14b are feedback-controlled based on the measurement results of the thermometer 40 and the shape meter 41 on the downstream side, thereby at least one of the amount of heat dissipated from the top surface by cooling and the amount of heat dissipated from the bottom surface by cooling is adjusted.
  • the cooling capabilities of the top side cooling device 14a and the bottom side cooling device 14b may be feedforward-controlled or feedback-controlled based on the measurement results of the thermometer 40 and the shape meter 41 on the downstream side. In any cases, in the divided cooling section Z2, at least one of the amount of heat dissipated from the top surface by cooling and the amount of heat dissipated from the bottom surface by cooling is adjusted.
  • thermometer 40 and the shape meter 41 Since the method for controlling the cooling capabilities of the top side cooling device 14a and the bottom side cooling device 14b based on the measurement results of the thermometer 40 and the shape meter 41 is the same as in the above embodiment described using FIGS. 4 to 7 , the method will not be described in detail.
  • At least one of the steepness of the wave shape of the hot-rolled steel sheet H and the sheet-threading speed of the hot-rolled steel sheet H may be used in addition to the measurement results of the thermometer 40 and the shape meter 41.
  • the steepness or the sheet-threading speed of the hot-rolled steel sheet H is also taken into consideration.
  • the temperature standard deviation of the hot-rolled steel sheet H becomes large.
  • the sheet-threading speed of the hot-rolled steel sheet H becomes a fast speed as illustrated in FIG. 11
  • the temperature standard deviation of the hot-rolled steel sheet H becomes large.
  • the temperature standard deviation is corrected by, for example, obtaining a temperature standard deviation in accordance with the steepness or sheet-threading speed of the hot-rolled steel sheet H in advance and measuring at least the steepness or sheet-threading speed of the hot-rolled steel sheet H.
  • the amount of heat dissipated from the top surface by cooling and the amount of heat dissipated from the bottom surface by cooling of the hot-rolled steel sheet H in the respective divided cooling sections Z1 and Z2 are corrected based on the corrected temperature standard deviation. Thereby, it is possible to more uniformly cool the hot-rolled steel sheet H.
  • FIG. 12 illustrates an example of a wave shape having an amplitude changing in the sheet width direction due to elongation at the center. As such, even in a case in which a temperature standard deviation is caused by the wave shape having an amplitude changing in the sheet width direction, according to the above-described embodiment, it becomes possible to reduce the temperature standard deviation in the sheet width direction.
  • the inventors found that, when the sheet-threading speed of the hot-rolled steel sheet H is set in a range of 550 m/min to the mechanical limit speed, it is possible to more uniformly cool the hot-rolled steel sheet H.
  • FIG. 13 schematically illustrates an example of a hot rolling facility 2 in another embodiment.
  • the hot rolling facility 2 is a facility aimed to sandwich the top and bottom of a heated slab S using rolls, continuously roll the slab to make the slab as thin as a minimum of 1.2 mm, and coil the slab.
  • the hot rolling facility 2 has a heating furnace 111 for heating the slab S, a width-direction mill 116 that rolls the slab S heated in the heating furnace 111 in a width direction, a roughing mill 112 that rolls the slab S rolled in the width direction from the vertical direction so as to produce a rough bar, a finishing mill 113 that further continuously hot-finishing-rolls the rough bar to a predetermined thickness, a cooling apparatus 114 that cools the hot-rolled steel sheet H hot-finishing-rolled using the finishing mill 113 using cooling water, and a coiling apparatus 115 that coils the hot-rolled steel sheet H cooled using the cooling apparatus 114 into a coil shape.
  • the heating furnace 11 is provided with a side burner, an axial burner and a roof burner that heat the slab S brought from the outside through a charging hole by blowing flame.
  • the slab S brought into the heating furnace 111 is sequentially heated in respective heating areas formed in respective zones, and, furthermore, a heat-retention treatment for enabling transportation at an optimal temperature is carried out by uniformly heating the slab S using the roof burner in a soaking area formed in a final zone.
  • a heating treatment in the heating furnace 111 completely ends, the slab S is transported to the outside of the heating furnace 111, and moved into a rolling process by the roughing mill 112.
  • the slab S transported from the heating furnace 111 is passed through gaps between columnar rotary rolls provided across a plurality of stands.
  • the roughing mill 112 hot-rolls the slab S only using work rolls 112a provided at the top and bottom of a first stand so as to form a rough bar.
  • the rough bar which has passed through the work rolls 112a is further continuously rolled using a plurality of fourfold mills 112b constituted by a work roll and a back-up roll.
  • the rough bar is rolled into a thickness of approximately 30 mm to 60 mm, and transported to the finishing mill 113.
  • the configuration of the roughing mill 112 is not limited to what has been described in the embodiment, and the number of rolls and the like can be arbitrarily set.
  • the finishing mill 113 finishing-rolls the rough bar transported from the roughing mill 112 until the thickness becomes approximately several millimeters.
  • the finishing mill 113 passes the rough bar through gaps between top and bottom finish rolling rolls 113a linearly arranged across 6 to 7 stands so as to gradually reduce the rough bar.
  • the hot-rolled steel sheet H finishing-rolled using the finishing mill 113 is transported to the cooling apparatus 114 using transportation rolls 132 (refer to FIG. 14 ). Meanwhile, a mill having the above-described pair of finish rolling rolls 113a linearly arrayed vertically is also referred to as a so-called rolling stand.
  • cooling apparatuses 142 that carry out inter-stand cooling (supplementary cooling) during finish rolling are disposed between the respective rolling rolls 113a arrayed across 6 to 7 stands (that is, between the rolling stands).
  • the details of the apparatus configuration and the like of the cooling apparatus 142 will be described below with reference to FIG. 17 .
  • FIG. 13 illustrates a case in which the cooling apparatuses 142 are disposed at two places in the finishing mill 113, but the cooling apparatuses 142 may be provided between all the rolling rolls 113a, or may be provided between some of the rolling rolls.
  • the cooling apparatus 114 is a facility for carrying out nozzle cooling on the hot-rolled steel sheet H transported from the finishing mill 113 through laminating or spraying. As illustrated in FIG. 14 , the cooling apparatus 114 has a top side cooling device 114a that sprays cooling water from cooling holes 131 on the top side to the top surface of the hot-rolled steel sheet H moving on the transportation rolls 132 in a run-out table, and a bottom side cooling device 114b that sprays cooling water from cooling holes 131 on the bottom side to the bottom surface of the hot-rolled steel sheet H.
  • a plurality of the cooling holes 131 is provided in the top side cooling device 114a and the bottom side cooling device 114b respectively.
  • a cooling header (not illustrated) is connected to the cooling holes 131.
  • the number of the cooling holes 131 determines the cooling capabilities of the top side cooling device 114a and the bottom side cooling device 114b.
  • the cooling apparatus 114 may be constituted by at least one of top and bottom split laminar, pipe laminar, spray cooling and the like.
  • the cooling headers connected to cooling holes 131 in the top side cooling device 114a and the cooling headers connected to cooling holes 131 in the bottom side cooling device 114b may be on-off controlled respectively.
  • the operation parameters of the respective cooling headers in the top side cooling device 114a and the bottom side cooling device 114b may be controlled. That is, at least one of the sprayed water density, pressure and water temperature of cooling water sprayed from the respective cooling holes 131 may be adjusted.
  • the flow rate or pressure of cooling water sprayed from the top side cooling device 114a and the bottom side cooling device 114b may be adjusted by thinning out the cooling headers (cooling holes 131) of the top side cooling device 114a and the bottom side cooling device 114b.
  • the cooling headers that constitute the top side cooling device 114a are preferably thinned out.
  • the coiling apparatus 115 coils the hot-rolled steel sheet H cooled using the cooling apparatus 114 at a predetermined coiling temperature as illustrated in FIG. 13 .
  • the hot-rolled steel sheet H coiled into a coil shape using the coiling apparatus 115 is transported to the outside of the hot rolling facility 2.
  • the hot-rolled steel sheet H having a wave shape with a surface height (wave height) changing in the rolling direction is cooled in the cooling apparatus 114 of the hot rolling facility 2 constituted as described above, as described above, it is possible to uniformly cool the hot-rolled steel sheet H by appropriately adjusting the water quantity densities, pressures, water temperatures and the like of cooling water sprayed from the top side cooling device 114a and cooling water sprayed from the bottom side cooling device 114b.
  • the hot-rolled steel sheet H As such, in the hot-rolled steel sheet H, portions that locally come into contact with the transportation rolls 132 or the aprons 133 become more easily coolable than other portions due to heat dissipation by contact. Therefore, the hot-rolled steel sheet H is ununiformly cooled.
  • the contact period of time becomes short. Furthermore, when the sheet-threading speed is increased, the hot-rolled steel sheet H in the process of sheet-threading becomes floated from the transportation rolls 132 or the aprons 133 due to repulsion by the contact between the hot-rolled steel sheet H and the transportation rolls 132 or the aprons 133.
  • the hot-rolled steel sheet H does not only become floated from the transportation rolls 132 or the aprons 133 due to repulsion by the contact, but the contact period of time or number of contacts between the hot-rolled steel sheet H and the transportation rolls 132 or the aprons 133 also decreases, and therefore the temperature decrease by the contact becomes negligible.
  • the heat dissipation by contact can be suppressed by increasing the sheet-threading speed, and the hot-rolled steel sheet H can be more uniformly cooled as illustrated in FIG. 16B .
  • the inventors found that the hot-rolled steel sheet H can be sufficiently uniformly cooled by setting the sheet-threading speed to 550 m/min or more in addition to the above-described control of the amounts of heat dissipated from the top and bottom surfaces.
  • the above finding is about the cooling of the hot-rolled steel sheet H having a wave shape; however, regardless of the height of the wave shape, the lowermost point of the hot-rolled steel sheet H comes into contact with the transportation rolls 132 or the aprons 133, and therefore, regardless of the height of the wave shape, an increase in the sheet-threading speed is effective for uniform cooling.
  • the sheet-threading speed of the hot-rolled steel sheet H is set to 550 m/min or more, since the hot-rolled steel sheet H becomes floated from the transportation rolls 132 or the aprons 133, there is no soaked water on the hot-rolled steel sheet H as in the related art even when cooling water is sprayed onto the hot-rolled steel sheet H in the above state. Therefore, it is possible to prevent the hot-rolled steel sheet H from being ununiformly cooled due to soaked water.
  • the sheet-threading speed of the hot-rolled steel sheet H in the cooling section is set to 550 m/min or more, it is possible to more uniformly cool the hot-rolled steel sheet H having a wave shape with a height periodically changing in the rolling direction.
  • the sheet-threading speed of the hot-rolled steel sheet H is preferably a faster speed, but it is impossible to exceed the mechanical limit speed (for example, 1550 m/min). Therefore, practically, the sheet-threading speed of the hot-rolled steel sheet H in the cooling section is set in a range of 550 m/min to the mechanical limit speed.
  • the sheet-threading speed of the hot-rolled steel sheet H is preferably set in a range of 550 m/min to the operation upper limit speed (for example, 1200 m/min).
  • control of the amount of heat dissipated from the top surface by cooling and the amount of heat dissipated from the bottom surface by cooling of the hot-rolled steel sheet H and the setting of the sheet-threading speed to a fast speed may be combined by applying the apparatus for cooling a hot-rolled steel sheet described using FIG. 3 to the hot rolling facility 2.
  • the hot-rolled steel sheet H having a large tensile strength particularly, a steel sheet called so-called high tensile strength steel having a tensile strength (TS) of 800 MPa or more and an experimental upper limit of 1400 MPa
  • TS tensile strength
  • the hot-rolled steel sheet H was sufficiently cooled by suppressing the sheet-threading speed of the hot-rolled steel sheet H in the cooling apparatus 114 (that is, the cooling section) to be low.
  • the local contacts between the hot-rolled steel sheet H and the transportation rolls 132 or the aprons 133 make the contact portions more easily coolable due to heat dissipation by contact as described above, and the hot-rolled steel sheet H is ununiformly cooled.
  • the inventors found that, when cooling is carried out between a pair of finish rolling rolls 113a (that is, rolling stands) provided across, for example, 6 to 7 stands in the finishing mill 113 of the hot rolling facility 2 (so-called inter-stand cooling), the heat dissipation by working can be suppressed, and the sheet-threading speed of the hot-rolled steel sheet H in the cooling apparatus 114 can be set to 550 m/min or more.
  • inter-stand cooling will be described with reference to FIG. 17 .
  • FIG. 17 is an explanatory view of the finishing mill 113 that can carry out the inter-stand cooling, in which a part of the finishing mill 113 is enlarged for the description and three rolling stands are illustrated. Meanwhile, in FIG. 17 , the same components as in the above embodiment will be given the same reference numeral.
  • a plurality (three in FIG. 17 ) of rolling stands 140 having a pair of vertically linearly arrayed finish rolling rolls 113a and the like is provided in the finishing mill 113.
  • the cooling apparatuses 142 which are facilities that carry out nozzle cooling through lamination or spraying are provided between the respective rolling stands 140, which make it possible to carry out the inter-stand cooling on the hot-rolled steel sheet H between the rolling stands 140.
  • the cooling apparatus 142 has a top side cooling device 142a that sprays cooling water from the top side through cooling holes 146 onto the hot-rolled steel sheet H transported in the finishing mill 113 and a bottom side cooling device 142b that sprays cooling water from the bottom side onto the hot-rolled steel sheet H as illustrated in FIG. 17 .
  • a plurality of the cooling holes 146 is provided respectively in the top side cooling device 142a and the bottom side cooling device 142b.
  • a cooling header (not illustrated) is connected to the cooling hole 146.
  • the cooling apparatus 142 may be constituted by at least one of top and bottom split laminar, pipe laminar, spray cooling and the like.
  • the finishing mill 113 having the configuration illustrated in FIG. 17 , particularly, in a case in which the tensile strength (TS) of the hot-rolled steel sheet H is 800 MPa or more, the heat dissipation by working in the hot-rolled steel sheet H is suppressed by carrying out the inter-stand cooling. Thereby, it becomes possible to maintain the sheet-threading speed of the hot-rolled steel sheet H in the cooling apparatus 114 at 550 m/min or more.
  • TS tensile strength
  • the problem of the related art caused in a case in which cooling was carried out at a slow sheet-threading speed, which was the local contacts between the hot-rolled steel sheet H and the transportation rolls 132 or the aprons 133 and the contact portions becoming more easily coolable due to heat dissipation by contact is solved, and the hot-rolled steel sheet H can be sufficiently uniformly cooled.
  • the cooling of the hot-rolled steel sheet H using the cooling apparatus 114 is preferably carried out in a temperature range of the exit-side temperature of the finishing mill to the hot-rolled steel sheet H of 600°C.
  • the temperature range in which the temperature of the hot-rolled steel sheet is 600°C or higher is a so-called film boiling range. That is, in this case, it is possible to avoid the so-called transition boiling area and to water-cool the hot-rolled steel sheet H in the film boiling area.
  • the hot-rolled steel sheet H is cooled in a state in which the entire surface of the hot-rolled steel sheet H is covered with a vapor film, it is possible to uniformly cool the hot-rolled steel sheet H. Therefore, it is possible to more uniformly cool the hot-rolled steel sheet H in a range in which the temperature of the hot-rolled steel sheet H is 600°C or higher as in the embodiment.
  • the inventors carried out cooling tests on a hot-rolled steel sheet as examples in order to verify that the hot-rolled steel sheet could be uniformly cooled by setting the sheet-threading speed of the hot-rolled steel sheet to 550 m/min or more.
  • Hot-rolled steel sheets with an intermediate wave having a sheet thickness of 2.5 mm, a width of 1200 mm, a tensile strength of 400 MPa and a steepness of 2% were cooled with varying sheet-threading speeds in a cooling apparatus.
  • the sheet-threading speeds were 400 m/min, 450 m/min, 500 m/min, 550 m/min, 600 m/min and 650 m/min, and the hot-rolled steel sheets were cooled at the respective sheet-threading speeds 20 times.
  • the temperatures of the hot-rolled steel sheets during coiling were measured, and an average value (amount of CT temperature change) of the standard deviations of temperature changes was computed using the temperature measurement results.
  • the evaluation results of the computed CT temperature change amount are described in Table 3 below. Meanwhile, in terms of the evaluation criteria, a case in which the CT temperature change amount was larger than 25°C was evaluated as ununiform cooling, and a case in which the CT temperature change amount was 25°C or less was evaluated as uniform cooling.
  • the sheet-threading speed is 500 m/min or less
  • the amount of CT temperature change is not sufficiently reduced (higher than 25°C), and the hot-rolled steel sheet is not sufficiently uniformly cooled.
  • the sheet-threading speed is 550 m/min or more
  • the CT temperature change amount is suppressed to 25°C or less
  • the hot-rolled steel sheet is uniformly cooled.
  • the sheet-threading speed is 600 m/min or more, it was found that, since the CT temperature was suppressed to lower than 10°C (8°C and 6°C), the above condition is more preferable for the uniform cooling of the hot-rolled steel sheet.
  • the inter-stand cooling was carried out on hot-rolled steel sheets with an intermediate wave having a sheet thickness of 2.5 mm, a width of 1200 mm, a tensile strength of 800 MPa and a steepness of 2% so that the exit-side temperature of finish rolling became 880°C, and cooling was carried out with varying sheet-threading speeds in a cooling apparatus.
  • the sheet-threading speeds were 400 m/min, 450 m/min, 500 m/min, 550 m/min, 600 m/min and 650 m/min, and the hot-rolled steel sheets were cooled at the respective sheet-threading speeds 20 times.
  • the present invention is useful when cooling a hot-rolled steel sheet which has been hot-rolled using a finishing mill so as to have a wave shape having a surface height changing in the rolling direction.

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Claims (5)

  1. Appareil (14) pour refroidir une tôle d'acier laminée à chaud dans une section de refroidissement fournie sur une trajectoire d'enfilage de tôle, la tôle d'acier laminée à chaud étant laminée à chaud en utilisant un laminoir de finition (13), l'appareil (14) comprenant :
    un thermomètre (40) qui mesure une température de la tôle d'acier laminée à chaud sur un côté aval de la section de refroidissement ;
    un dispositif de refroidissement de côté supérieur (14a) qui refroidit une surface supérieure de la tôle d'acier laminée à chaud dans la section de refroidissement ; et
    un dispositif de refroidissement de côté de fond (14b) qui refroidit une surface de fond de la tôle d'acier laminée à chaud dans la section de refroidissement ; caractérisé en ce que
    l'appareil (14) comprend de plus :
    un dispositif de mesure de forme (41) qui mesure une forme de la tôle d'acier laminée à chaud sur le côté aval de la section de refroidissement ; et
    un dispositif de contrôle (50) qui contrôle au moins une d'une quantité de chaleur dissipée à partir de la surface supérieure par refroidissement et une quantité de chaleur dissipée à partir de la surface de fond par refroidissement de la tôle d'acier laminée à chaud dans la section de refroidissement en contrôlant le dispositif de refroidissement de côté supérieur (14a) et le dispositif de refroidissement de côté de fond (14b) sur la base des résultats de mesure de température de la tôle d'acier laminée à chaud obtenus à partir du thermomètre (40) et des résultats de mesure de forme de la tôle d'acier laminée à chaud obtenus à partir du dispositif de mesure de forme (41),
    où le dispositif de contrôle (50) comprend :
    une unité de calcul de température moyenne (51) qui calcule une valeur moyenne chronologique de la température de la tôle d'acier laminée à chaud sur le côté aval de la section de refroidissement comme une température moyenne sur la base des résultats de mesure de température ;
    une unité de calcul de vitesse de modification (52) qui calcule une vitesse de modification de la tôle d'acier laminée à chaud sur le côté aval de la section de refroidissement sur la base des résultats de mesure de forme ;
    une unité de détermination de direction de contrôle (53) qui, lorsque l'ascendant dans une direction verticale de la tôle d'acier laminée à chaud est fixé comme positif, dans une surface avec une vitesse de modification positive, dans un cas où la température de la tôle d'acier laminée à chaud est inférieure à une température moyenne d'un intervalle d'un ou plusieurs cycles d'une forme d'onde de la tôle d'acier laminée à chaud, détermine au moins une d'une direction dans laquelle la quantité de chaleur dissipée à partir de la surface supérieure par refroidissement diminue et une direction dans laquelle la quantité de chaleur dissipée à partir de la surface de fond par refroidissement augmente comme une direction de contrôle, et, dans un cas où la température de la tôle d'acier laminée à chaud est supérieure à la température moyenne, détermine au moins une d'une direction dans laquelle la quantité de chaleur dissipée à partir de la surface supérieure par refroidissement augmente et une direction dans laquelle la quantité de chaleur dissipée à partir de la surface de fond par refroidissement diminue comme la direction de contrôle,
    dans une surface avec une vitesse de modification négative, dans un cas où la température de la tôle d'acier laminée à chaud est inférieure à la température moyenne, détermine au moins une d'une direction dans laquelle la quantité de chaleur dissipée à partir de la surface supérieure par refroidissement augmente et une direction dans laquelle la quantité de chaleur dissipée à partir de la surface de fond par refroidissement diminue comme la direction de contrôle, et, dans un cas où la température de la tôle d'acier laminée à chaud est supérieure à la température moyenne, détermine au moins une d'une direction dans laquelle la quantité de chaleur dissipée à partir de la surface supérieure par refroidissement diminue et une direction dans laquelle la quantité de chaleur dissipée à partir de la surface de fond par refroidissement augmente comme la direction de contrôle ; et
    une unité d'ajustement (54) d'une quantité totale de chaleur dissipée par refroidissement qui ajuste une valeur totale de la quantité de chaleur dissipée à partir de la surface supérieure par refroidissement et de la quantité de chaleur dissipée à partir de la surface de fond par refroidissement de la tôle d'acier laminée à chaud dans la section de refroidissement sur la base des directions de contrôle déterminées en utilisant l'unité de détermination de direction de contrôle (53).
  2. Appareil (14) pour refroidir une tôle d'acier laminée à chaud selon la revendication 1,
    caractérisé en ce qu'un écart de position entre un endroit de mesure de température du thermomètre et un endroit de mesure de forme du dispositif de mesure de forme sur la tôle d'acier laminée à chaud est de 50 mm ou inférieur.
  3. Appareil (14) pour refroidir une tôle d'acier laminée à chaud selon la revendication 1 ou 2,
    caractérisé en ce qu'une vitesse d'enfilage de tôle de la tôle d'acier laminée à chaud dans la section de refroidissement est fixée dans un intervalle de 550 m/min à 1 550 m/min.
  4. Appareil (14) pour refroidir une tôle d'acier laminée à chaud selon la revendication 3,
    caractérisé en ce que l'appareil pour refroidir est approprié pour refroidir une tôle d'acier laminée à chaud ayant une résistance à la traction de 800 MPa ou supérieure.
  5. Appareil (114) pour refroidir une tôle d'acier laminée à chaud selon la revendication 3,
    caractérisé en ce que l'appareil (114) comprend de plus un dispositif de refroidissement supplémentaire (142) qui réalise un refroidissement supplémentaire de la tôle d'acier laminée à chaud, le dispositif de refroidissement supplémentaire (142) étant fourni entre des laminoirs adjacents (113a) du laminoir de finition (113) étant constitué de plusieurs laminoirs (113a).
EP12873885.3A 2012-12-06 2012-12-06 Dispositif permettant de refroidir une tôle d'acier laminée à chaud Active EP2929949B1 (fr)

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EP2929949A1 EP2929949A1 (fr) 2015-10-14
EP2929949A4 EP2929949A4 (fr) 2016-07-06
EP2929949B1 true EP2929949B1 (fr) 2018-04-25

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JP (1) JP5310966B1 (fr)
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KR20140100884A (ko) 2014-08-18
KR101498843B1 (ko) 2015-03-04
EP2929949A1 (fr) 2015-10-14
WO2014087520A1 (fr) 2014-06-12
BR112013028746A2 (pt) 2017-01-24
CN103987469A (zh) 2014-08-13
CN103987469B (zh) 2015-11-25
BR112013028746B1 (pt) 2022-08-09
EP2929949A4 (fr) 2016-07-06
JPWO2014087520A1 (ja) 2017-01-05
JP5310966B1 (ja) 2013-10-09

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