EP2764932A1 - Method for cooling hot-rolled steel sheet - Google Patents
Method for cooling hot-rolled steel sheet Download PDFInfo
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- EP2764932A1 EP2764932A1 EP12873475.3A EP12873475A EP2764932A1 EP 2764932 A1 EP2764932 A1 EP 2764932A1 EP 12873475 A EP12873475 A EP 12873475A EP 2764932 A1 EP2764932 A1 EP 2764932A1
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- Prior art keywords
- cooling
- hot
- steel sheet
- rolled steel
- temperature
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- 238000001816 cooling Methods 0.000 title claims abstract description 612
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 504
- 239000010959 steel Substances 0.000 title claims abstract description 504
- 238000000034 method Methods 0.000 claims abstract description 81
- 238000005096 rolling process Methods 0.000 claims description 56
- 239000000498 cooling water Substances 0.000 claims description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 238000005259 measurement Methods 0.000 claims description 23
- 238000009529 body temperature measurement Methods 0.000 claims description 22
- 229910004682 ON-OFF Inorganic materials 0.000 claims description 6
- 230000000576 supplementary Effects 0.000 claims description 4
- 238000004642 transportation engineering Methods 0.000 description 31
- 238000011156 evaluation Methods 0.000 description 24
- 238000010438 heat treatment Methods 0.000 description 22
- 241000681094 Zingel asper Species 0.000 description 19
- 238000005098 hot rolling Methods 0.000 description 18
- 239000000463 material Substances 0.000 description 11
- 239000007921 spray Substances 0.000 description 11
- 230000001629 suppression Effects 0.000 description 11
- 238000009835 boiling Methods 0.000 description 10
- 230000017525 heat dissipation Effects 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000005070 sampling Methods 0.000 description 5
- 230000003247 decreasing Effects 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 238000009114 investigational therapy Methods 0.000 description 3
- 206010037660 Pyrexia Diseases 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 230000001131 transforming Effects 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000002542 deteriorative Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- -1 particularly Substances 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
-
- 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
Abstract
Description
- The present invention relates to a method for cooling a hot-rolled steel sheet in which a hot-rolled steel sheet hot-rolled using a finishing mill is cooled.
- For example, a hot-rolled steel sheet used in cars, industrial machines and the like is generally manufactured through a rough-rolling process and a finish-rolling process.
FIG. 21 is a view schematically illustrating a method for manufacturing a hot-rolled steel sheet of the related art. In the process for manufacturing a hot-rolled steel sheet, first, a slab S obtained by continuously casting molten steel having an adjusted predetermined composition is rolled using a roughingmill 201, and then, furthermore, hot-rolled using a finishingmill 203 constituted by a plurality of rollingstands 202a to 202d, thereby forming a hot-rolled steel sheet H having a predetermined thickness. In addition, the hot-rolled steel sheet H is cooled using cooling water supplied from acooling apparatus 211, and then coiled into a coil shape using acoiling 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 thefinishing mill 203. Thecooling 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. - In addition, for example,
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. According to the technique disclosed inPatent Document 1, 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. - In addition, for example,
Patent Document 2 discloses a technique that cools a rolled material between two adjacent stands in a finishing mill using a sprayer, thereby beginning and completing the γ-α transformation of the rolled material so as to prevent sheet-threading performance between the stands from deteriorating. - In addition, for example,
Patent Document 3 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. - Furthermore, for example,
Patent Document 4 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. - Here, there are cases in which the hot-rolled steel sheet H manufactured using the manufacturing method illustrated in
FIG. 21 forms a wave shape in the rolling direction (the arrow direction inFIG. 22 ) ontransportation rolls 220 in the run-out table (hereinafter sometimes referred to as "ROT") in thecooling apparatus 211 as illustrated inFIG. 22 . In this case, 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. - Therefore, for example,
Patent Document 5 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. -
- [Patent Document 1] Japanese Unexamined Patent Application, First Publication No.
2005-74463 - [Patent Document 2] Japanese Unexamined Patent Application, First Publication No.
H05-337505 - [Patent Document 3] Japanese Unexamined Patent Application, First Publication No.
2005-271052 - [Patent Document 4] Japanese Unexamined Patent Application, First Publication No.
2003-48003 - [Patent Document 5] Japanese Unexamined Patent Application, First Publication No.
H06-328117 - However, in the cooling method of
Patent Document 1, a case of a hot-rolled steel sheet having a wave shape in the rolling direction is not taken into consideration. In the hot-rolled steel sheet H having a wave shape described above, there are cases in which the bottom portion of the wave shape locally comes into contact with thetransportation rolls 220 as illustrated inFIG. 22 . In addition, there are cases in which the hot-rolled steel sheet H locally comes into contact with aprons (not illustrated inFIG. 22 ) provided as supports in order to prevent the hot-rolled steel sheet H from dropping between thetransportation rolls 220 at the bottom portion of the wave shape. In the wave-shaped hot-rolled steel sheet H, the portions that locally come into contact with thetransportation 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, inPatent Document 1, 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. - In addition, the technique described in
Patent Document 2 is to make (soft) ultra low carbon steel having a relatively low hardness undergo γ-α transformation between stands in a finishing mill, and does not aim at uniform cooling. In addition, the invention ofPatent Document 2 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. - In addition, in the cooling method of
Patent Document 3, 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,Patent Document 3 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. - In addition, the cooling of
Patent Document 4 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. Furthermore,Patent Document 4 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. - In addition, in the cooling method of
Patent Document 5, 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 by 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. Furthermore, 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 ofPatent Document 5, 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 present invention employs the following means for solving the problems and achieving the relevant object.
- That is,
- (1) According to an aspect of the present invention, a method for cooling a hot-rolled steel sheet is provided in which a hot-rolled steel sheet hot-rolled using a finishing mill is cooled in a cooling section provided on a sheet-threading path, including a target ratio-setting process in which a top and bottom heat transfer coefficient ratio X1, at which a temperature standard deviation Y becomes a minimum value Ymin, is set as a target ratio Xt based on correlation data indicating a correlation between a top and bottom heat transfer coefficient ratio X, which is a ratio of heat transfer coefficients of top and bottom surfaces of the hot-rolled steel sheet, and the temperature standard deviation Y during or after cooling of the hot-rolled steel sheet, which have been experimentally obtained in advance under conditions in which steepness and sheet-threading speed of the hot-rolled steel sheet are set to constant values; and a cooling control process in which at least one of an amount of heat dissipated from a top surface by cooling and an amount of heat dissipated from a bottom surface by cooling of the hot-rolled steel sheet in the cooling section is controlled so that the top and bottom heat transfer coefficient ratio X of the hot-rolled steel sheet in the cooling section matches the target ratio Xt.
- (2) In the method for cooling a hot-rolled steel sheet according to the above (1), in the target ratio-setting process, a top and bottom heat transfer coefficient ratio X at which the temperature standard deviation Y converges in a range of the minimum value Ymin to the minimum value Ymin+10°C may be set as the target ratio Xt based on the correlation data.
- (3) In the method for cooling a hot-rolled steel sheet according to the above (1) or (2), the correlation data may be prepared respectively for a plurality of conditions in which values of the steepness and the sheet-threading speed are different, and, in the target ratio-setting process, the target ratio Xt may be set based on correlation data matching actually measured values of the steepness and the sheet-threading speed among the plurality of correlation data.
- (4) In the method for cooling a hot-rolled steel sheet according to the above (3), the correlation data may be data indicating the correlation between the top and bottom heat transfer coefficient ratio X and the temperature standard deviation Y using a regression formula.
- (5) In the method for cooling a hot-rolled steel sheet according to the above (4), the regression formula may be a formula derived using linear regression.
- (6) In the method for cooling a hot-rolled steel sheet according to the above (3), the correlation data may be data indicating the correlation between the top and bottom heat transfer coefficient ratio X and the temperature standard deviation Y using a table.
- (7) The method for cooling a hot-rolled steel sheet according to the above (1) or (2) may further include a temperature-measuring process in which a temperature of the hot-rolled steel sheet is measured in chronological order on a downstream side of the cooling section; an average temperature value-computing process in which a chronological average value of the temperature is computed based on a measurement result of the temperature; and an amount of heat dissipated by cooling-adjusting process in which a 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 in the cooling section is adjusted so that the chronological average value of the temperature matches a predetermined target temperature.
- (8) The method for cooling a hot-rolled steel sheet according to the above (1) or (2) may further include a temperature-measuring process in which a temperature of the hot-rolled steel sheet is measured in chronological order on a downstream side of the cooling section; a changing speed-measuring process in which a changing speed of the hot-rolled steel sheet in a vertical direction is measured in chronological order at a same place as a temperature measurement place of the hot-rolled steel sheet on the downstream side of the cooling section; a control direction-determining process in which, when an upward side of the vertical direction of the hot-rolled steel sheet is set as positive, in an area with a positive changing speed, in a case in which a temperature of the hot-rolled steel sheet is lower than an average temperature in a range of one or more cycles of a wave shape of the hot-rolled steel sheet, 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, in a case in which the temperature of the hot-rolled steel sheet 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, and, in an area with a negative changing speed, in a case in which the temperature of the hot-rolled steel sheet is lower 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, in a case in which the temperature of the hot-rolled steel sheet 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; and an amount of heat dissipated by cooling-adjusting process in which 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 in the cooling section is adjusted based on the control direction determined in the control direction-determining process.
- (9) In the method for cooling a hot-rolled steel sheet according to the above (8), the cooling section may be divided into a plurality of divided cooling sections in a sheet-threading direction of the hot-rolled steel sheet, the temperature and changing speed of the hot-rolled steel sheet may be measured in chronological order at each of borders of the divided cooling sections in the temperature-measuring process and the changing speed-measuring process; increase and decrease directions of the amounts of heat dissipated by cooling from the top and bottom surfaces of the hot-rolled steel sheet may be determined for the respective divided cooling sections based on measurement results of the temperature and changing speeds of the hot-rolled steel sheet at the respective borders of the divided cooling sections in the control direction-determining process; and feedback control or feedforward control may be carried out in order to adjust 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 at each of the divided cooling sections based on the control direction determined for each of the divided cooling sections in the amount of heat dissipated by cooling-adjusting process.
- (10) The method for cooling a hot-rolled steel sheet according to the above (9) may further include a measuring process in which the steepness or the sheet-threading speed of the hot-rolled steel sheet is measured at each of the borders of the divided cooling sections; and an amount of heat dissipated by cooling-correcting process in which 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 is corrected at each of the divided cooling sections based on measurement results of the steepness or the sheet-threading speeds.
- (11) The method for cooling a hot-rolled steel sheet according to the above (1) or (2) may further include a post-cooling process in which the hot-rolled steel sheet is further cooled in order to make the temperature standard deviation of the hot-rolled steel sheet fall into a permissible range on a downstream side of the cooling section.
- (12) In the method for cooling a hot-rolled steel sheet according to the above (1) or (2), the sheet-threading speed of the hot-rolled steel sheet in the cooling section may be set in a range of 550 m/min to a mechanical limit speed.
- (13) In the method for cooling a hot-rolled steel sheet according to the above (1) or (2), a tensile strength of the hot-rolled steel sheet may be 800 MPa or more.
- (14) In the method for cooling a hot-rolled steel sheet according to the above (12), the finishing mill may be constituted by a plurality of rolling stands, and a supplementary cooling process in which the hot-rolled steel sheet is supplementarily cooled between the plurality of rolling stands may be further provided.
- (15) In the method for cooling a hot-rolled steel sheet according to the above (1) or (2), a top side cooling apparatus having a plurality of headers that ejects cooling water to a top surface of the hot-rolled steel sheet and a bottom side cooling apparatus having a plurality of headers that ejects cooling water to a bottom surface of the hot-rolled steel sheet may be provided in the cooling section, and the amount of heat dissipated from the top surface by cooling and the amount of heat dissipated from the bottom surface by cooling may be adjusted by carrying out on-off control of the respective headers.
- (16) In the method for cooling a hot-rolled steel sheet according to the above (1) or (2), a top side cooling apparatus having a plurality of headers that ejects cooling water to a top surface of the hot-rolled steel sheet and a bottom side cooling apparatus having a plurality of headers that ejects cooling water to a bottom surface of the hot-rolled steel sheet may be provided in the cooling section, and the amount of heat dissipated from the top surface by cooling and the amount of heat dissipated from the bottom surface by cooling may be adjusted by controlling at least one of sprayed water density, pressure and water temperature of each of the headers.
- (17) In the method for cooling a hot-rolled steel sheet according to the above (1) or (2), cooling in the cooling section may be carried out at a temperature of the hot-rolled steel sheet in a range of 600°C or higher.
-
FIG. 1 is an explanatory view illustrating ahot rolling facility 1 for realizing a method for cooling a hot-rolled steel sheet in an embodiment of the present invention. -
FIG. 2 is an explanatory view illustrating an outline of a configuration of acooling apparatus 14 provided in thehot rolling facility 1. -
FIG. 3 is a graph illustrating a correlation between a top and bottom heat transfer coefficient ratio X and a temperature standard deviation Y which have been obtained under conditions in which steepness and sheet-threading speed of a hot-rolled steel sheet H are set to constant values. -
FIG. 4 is an explanatory view illustrating a method for searching a minimum point (minimum value Ymin) of the temperature standard deviation Y from the correlation illustrated inFIG. 3 . -
FIG. 5 is a graph illustrating a relationship between temperature change and steepness of the hot-rolled steel sheet H during cooling in ROT of a typical strip in an ordinary operation, in which the top graph indicates the temperature change with respect to a distance from a coil tip or a time at which a coil passes a fixed point, and the bottom graph indicates the steepness with respect to the distance from the coil tip or the time at which the coil passes the fixed point. -
FIG. 6 is a graph illustrating the relationship between the temperature change and steepness of the hot-rolled steel sheet H during cooling in ROT of the typical strip in the ordinary operation. -
FIG. 7 is a graph illustrating the relationship between the temperature change and steepness of the hot-rolled steel sheet H when an amount of heat dissipated from the top surface by cooling is decreased and an amount of heat dissipated from the bottom surface by cooling is increased in a case in which the temperature of the hot-rolled steel sheet H becomes low with respect to an average temperature of the hot-rolled steel sheet H in an area of a positive changing speed of the hot-rolled steel sheet H and the temperature of the hot-rolled steel sheet H becomes high in an area of a negative changing speed. Meanwhile, the steepness of a wave shape of the hot-rolled steel sheet H refers to a value obtained by dividing an amplitude of the wave shape by a length of a cycle in a rolling direction. -
FIG. 8 is a graph illustrating the relationship between the temperature change and steepness of the hot-rolled steel sheet H when the amount of heat dissipated from the top surface by cooling is increased and the amount of heat dissipated from the bottom surface by cooling is decreased in a case in which the temperature of the hot-rolled steel sheet H becomes low with respect to the average temperature of the hot-rolled steel sheet H in the area of a positive changing speed of the hot-rolled steel sheet H and the temperature of the hot-rolled steel sheet H becomes high in the area of a negative changing speed. -
FIG. 9 is a graph illustrating the correlation between the steepness and the temperature standard deviation Y of the hot-rolled steel sheet H which have been obtained under conditions in which the top and bottom heat transfer coefficient ratio X and the sheet-threading speed are set to constant values. -
FIG. 10 is a graph illustrating the correlations between the top and bottom heat transfer coefficient ratios X and the temperature standard deviations Y which have been obtained respectively under a plurality of conditions in which the values of the steepness are different (wherein the sheet-threading speed is constant). -
FIG. 11 is a graph illustrating the correlation between the sheet-threading speed and temperature standard deviation Y of the hot-rolled steel sheet H which have been obtained under conditions in which the top and bottom heat transfer coefficient ratio X and the steepness are set to constant values. -
FIG. 12 is a graph illustrating the correlation between the top and bottom heat transfer coefficient ratios X and the temperature standard deviations Y which have been obtained respectively under a plurality of conditions in which the values of the sheet-threading speed are different (wherein the steepness is constant). -
FIG. 13 is an explanatory view illustrating the details of a periphery of thecooling apparatus 14 in thehot rolling facility 1. -
FIG. 14 is an explanatory view illustrating a modified example of thecooling apparatus 14. -
FIG. 15 is an explanatory view illustrating a shape of the temperature standard deviation ofthe hot-rolled steel sheet H formed in a sheet width direction. -
FIG. 16 is an explanatory view illustrating ahot rolling facility 2 for realizing a method for cooling the hot-rolled steel sheet H in another embodiment. -
FIG. 17 is an explanatory view illustrating an outline of a configuration of acooling apparatus 114 provided in thehot rolling facility 2. -
FIG. 18A is an explanatory view illustrating a shape in which a bottom point of the hot-rolled steel sheet H comes into contact with atransportation roll 132. -
FIG. 18B is an explanatory view illustrating a shape in which the bottom point of the hot-rolled steel sheet H comes into contact with thetransportation roll 132 and anapron 133. -
FIG. 19A is a graph illustrating a change of the temperature of the hot-rolled steel sheet H over time in a case in which the sheet-threading speed of the hot-rolled steel sheet H is slow. -
FIG. 19B is a graph illustrating a change of the temperature of the hot-rolled steel sheet H over time in a case in which the sheet-threading speed of the hot-rolled steel sheet H is high. -
FIG. 20 is an explanatory view of afinishing mill 113 that can carry out interstand cooling. -
FIG. 21 is an explanatory view illustrating a method for manufacturing the hot-rolled steel sheet H of the related art. -
FIG. 22 is an explanatory view illustrating a method for cooling the hot-rolled steel sheet H of the related art.
Table 1 describes the correlation data illustrated in
Top and bottom heat transfer coefficient ratio X | Temperature standard deviation Y (°C) | Difference of standard deviation from minimum value (°C) | Evaluation |
1.6/1.0 | 33.2 | 30.9 | C |
1.2/1.0 | 14.6 | 12.3 | C |
1.1/1.0 | 8.5 | 6.2 | B |
1.0/1.0 | 2.3 | 0.0 | A |
1.0/1.1 | 6.1 | 3.8 | B |
1.0/1.2 | 9.8 | 7.5 | B |
1.0/1.6 | 28.7 | 26.4 | C |
Changing speed | Positive | Negative | |||
Temperature | Low | High | Low | High | |
Amount of heat dissipated by cooling | Top surface side | Decrease | Increase | Increase | Decrease |
Bottom surface side | Increase | Decrease | Decrease | Increase |
Steepness (%) | Top and bottom heat transfer coefficient ratio X | Temperature standard deviation (°C) | Difference of standard deviation from minimum value (°C) | |
1 | 1.6/1.0 | 16.6 | 15.4 | C |
1.2/1.0 | 7.3 | 6.1 | B | |
1.0/1.0 | 12 | 0.0 | A | |
1.0/1.2 | 4.9 | 3.7 | B | |
1.0/1.6 | 14.4 | 13.2 | | |
2 | 1.6/1.0 | 33.2 | 30.9 | C |
1.1/1.0 | 8.5 | 6.2 | B | |
1.0/1.0 | 2.3 | 0.0 | A | |
1.0/1.1 | 6.1 | 3.8 | B | |
1.0/1.6 | 28.7 | 26.4 | | |
3 | 1.2/1.0 | 21.9 | 18.4 | C |
1.1/1.0 | 12.7 | 9.2 | B | |
1.0/1.0 | 3.5 | 0.0 | A | |
1.0/1.1 | 9.1 | 5.6 | B | |
1.0/1.2 | 14.7 | 11.2 | C |
Sheet-threading speed (m/s) | Top and bottom heat transfer coefficient ratio X | Temperature standard deviation Y (°C) | Difference of standard deviation from minimum value (°C) | |
5 | 1.6/1.0 | 16.6 | 15.4 | C |
1.2/1.0 | 7.3 | 6.1 | B | |
1.0/1.0 | 1.2 | 0.0 | A | |
1.0/1.2 | 4.9 | 3.7 | B | |
1.0/1.6 | 14.4 | 13.2 | | |
10 | 1.6/1.0 | 33.2 | 30.9 | C |
1.1/1.0 | 8.5 | 6.2 | B | |
1.0/1.0 | 2.3 | 0.0 | A | |
1.0/1.1 | 6.1 | 3.8 | B | |
1.0/1.6 | 28.7 | 26.4 | | |
15 | 1.2/2.0 | 21.9 | 18.4 | C |
1.1/1.0 | 12.7 | 9.2 | B | |
1.0/1.0 | 3.5 | 0.0 | A | |
1.0/1.1 | 9.1 | 5.6 | B | |
1.0/1.2 | 14.7 | 11.2 | | |
20 | 1.2/1.0 | 29.2 | 24.6 | C |
1.05/1.0 | 10.8 | 6.2 | B | |
1.0/1.0 | 4.6 | 0.0 | A | |
1.0/1.05 | 8.4 | 3.8 | B | |
1.0/1.2 | 19.6 | 15.0 | C |
Sheet-threading speed [m/min] | 400 | 450 | 500 | 550 | 600 | 650 |
Exit-side finishing temperature [°C] | 830 | 850 | 870 | 890 | 910 | 930 |
CT temperature change amount [°C] | 58 | 37 | 32 | 12 | 8 | 6 |
Evaluation | C | C | C | B | A | A |
Evaluation C: CT>25°C B: 25≥CT≥10 A: 10>CT
Sheet-threading speed [m/min] | 400 | 450 | 500 | 550 | 600 | 650 |
Inter-stand cooling | No | Yes | Yes | Yes | Yes | Yes |
CT temperature change amount [°C] | 62 | 43 | 28 | 10 | 6 | 6 |
Evaluation | C | C | C | B | A | A |
Evaluation C: CT>25°C B: 25≥CT≥10 A: 10>CT
- 1, 2: HOT ROLLING FACILITY
- 11, 111: HEATING FURNACE
- 12, 112: ROUGHING MILL
- 12a, 112a: WORK ROLL
- 12b, 112b: FOURFOLD MILL
- 13,113: FINISHING MILL
- 13a, 113a: FINISH ROLLING ROLL
- 14, 114: COOLING APPARATUS
- 14a, 114a: TOP SIDE COOLING APPARATUS
- 14b, 114b: BOTTOM SIDE COOLING APPARATUS
- 15, 115: COILING APPARATUS
- 16, 116: WIDTH-DIRECTION MILL
- 31,131: COOLING HOLE
- 32, 132: TRANSPORTATION ROLL
- 40: THERMOMETER
- 41: SHAPE METER
- H: HOT-ROLLED STEEL SHEET
- S: SLAB
- Z1, Z2: DIVIDED COOLING SECTION
Claims (17)
- A method for cooling a hot-rolled steel sheet in which a hot-rolled steel sheet hot-rolled using a finishing mill is cooled in a cooling section provided on a sheet-threading path, the method comprising:a target ratio-setting process in which a top and bottom heat transfer coefficient ratio X1, at which a temperature standard deviation Y becomes a minimum value Ymin, is set as a target ratio Xt based on correlation data indicating a correlation between a top and bottom heat transfer coefficient ratio X, which is a ratio of heat transfer coefficients of top and bottom surfaces of the hot-rolled steel sheet, and the temperature standard deviation Y during or after cooling of the hot-rolled steel sheet, which have been experimentally obtained in advance under conditions in which steepness and sheet-threading speed of the hot-rolled steel sheet are set to constant values; anda cooling control process in which at least one of an amount of heat dissipated from a top surface by cooling and an amount of heat dissipated from a bottom surface by cooling of the hot-rolled steel sheet in the cooling section is controlled so that the top and bottom heat transfer coefficient ratio X of the hot-rolled steel sheet in the cooling section matches the target ratio Xt.
- The method for cooling a hot-rolled steel sheet according to Claim 1,
wherein, in the target ratio-setting process, a top and bottom heat transfer coefficient ratio X at which the temperature standard deviation Y converges in a range of the minimum value Ymin to the minimum value Ymin+10°C is set as the target ratio Xt based on the correlation data. - The method for cooling a hot-rolled steel sheet according to Claim 1 or 2,
wherein the correlation data are prepared respectively for a plurality of conditions in which values of the steepness and the sheet-threading speed are different, and,
in the target ratio-setting process, the target ratio Xt is set based on correlation data matching actually measured values of the steepness and the sheet-threading speed of the plurality of correlation data. - The method for cooling a hot-rolled steel sheet according to Claim 3,
wherein the correlation data are data indicating a correlation between the top and bottom heat transfer coefficient ratio X and the temperature standard deviation Y using a regression formula. - The method for cooling a hot-rolled steel sheet according to Claim 4,
wherein the regression formula is a formula derived using linear regression. - The method for cooling a hot-rolled steel sheet according to Claim 3,
wherein the correlation data are data indicating a correlation between the top and bottom heat transfer coefficient ratio X and the temperature standard deviation Y using a table. - The method for cooling a hot-rolled steel sheet according to Claim 1 or 2, the method further comprising:a temperature-measuring process in which a temperature of the hot-rolled steel sheet is measured in chronological order on a downstream side of the cooling section;an average temperature value-computing process in which a chronological average value of the temperature is computed based on a measurement result of the temperature; andan amount of heat dissipated by cooling-adjusting process in which a 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 in the cooling section is adjusted so that the chronological average value of the temperature matches a predetermined target temperature.
- The method for cooling a hot-rolled steel sheet according to Claim 1 or 2, the method further comprising:a temperature-measuring process in which a temperature of the hot-rolled steel sheet is measured in chronological order on a downstream side of the cooling section;a changing speed-measuring process in which a changing speed of the hot-rolled steel sheet in a vertical direction is measured in chronological order at a same place as a temperature measurement place of the hot-rolled steel sheet on the downstream side of the cooling section;a control direction-determining process in which, when an upward side of the vertical direction of the hot-rolled steel sheet is set as positive, in an area with a positive changing speed, in a case in which a temperature of the hot-rolled steel sheet is lower than an average temperature in a range of one or more cycles of a wave shape of the hot-rolled steel sheet, 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, in a case in which the temperature of the hot-rolled steel sheet 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,in an area with a negative changing speed, in a case in which the temperature of the hot-rolled steel sheet is lower 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, and, in a case in which the temperature of the hot-rolled steel sheet 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; andan amount of heat dissipated by cooling-adjusting process in which 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 in the cooling section is adjusted based on the control direction determined in the control direction-determining process.
- The method for cooling a hot-rolled steel sheet according to Claim 8, wherein the cooling section is divided into a plurality of divided cooling sections in a sheet-threading direction of the hot-rolled steel sheet,
the temperature and changing speed of the hot-rolled steel sheet are measured in chronological order at each of borders of the divided cooling sections in the temperature-measuring process and the changing speed-measuring process;
increase and decrease directions of the amounts of heat dissipated by cooling from the top and bottom surfaces of the hot-rolled steel sheet are determined for the respective divided cooling sections based on measurement results of the temperature and changing speeds of the hot-rolled steel sheet at the respective borders of the divided cooling sections in the control direction-determining process; and
feedback control or feed forward control is carried out in order to adjust 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 at each of the divided cooling sections based on the control direction determined for each of the divided cooling sections in the amount of heat dissipated by cooling-adjusting process. - The method for cooling a hot-rolled steel sheet according to Claim 9, the method further comprising:a measuring process in which the steepness or sheet-threading speed of the hot-rolled steel sheet is measured at each of the borders of the divided cooling sections; andan amount of heat dissipated by cooling-correcting process in which 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 is corrected at each of the divided cooling sections based on measurement results of the steepness or the sheet-threading speeds.
- The method for cooling a hot-rolled steel sheet according to Claim 1 or 2, the method further comprising:a post-cooling process in which the hot-rolled steel sheet is further cooled on a downstream side of the cooling section in order to make the temperature standard deviation of the hot-rolled steel sheet fall into a permissible range.
- The method for cooling a hot-rolled steel sheet according to Claim 1 or 2,
wherein the sheet-threading speed of the hot-rolled steel sheet in the cooling section is set in a range of 550 m/min to a mechanical limit speed. - The method for cooling a hot-rolled steel sheet according to Claim 12,
wherein a tensile strength of the hot-rolled steel sheet is 800 MPa or more. - The method for cooling a hot-rolled steel sheet according to Claim 12,
wherein the finishing mill is constituted by a plurality of rolling stands, and
a supplementary cooling process in which the hot-rolled steel sheet is supplementarily cooled between the plurality of rolling stands is further provided. - The method for cooling a hot-rolled steel sheet according to Claim 1 or 2,
wherein a top side cooling apparatus having a plurality of headers that ejects cooling water to a top surface of the hot-rolled steel sheet and a bottom side cooling apparatus having a plurality of headers that ejects cooling water to a bottom surface of the hot-rolled steel sheet are provided in the cooling section, and
the amount of heat dissipated from the top surface by cooling and the amount of heat dissipated from the bottom surface by cooling are adjusted by carrying out on-off control of the respective headers. - The method for cooling a hot-rolled steel sheet according to Claim 1 or 2,
wherein a top side cooling apparatus having a plurality of headers that ejects cooling water to a top surface of the hot-rolled steel sheet and a bottom side cooling apparatus having a plurality of headers that ejects cooling water to a bottom surface of the hot-rolled steel sheet are provided in the cooling section, and
the amount of heat dissipated from the top surface by cooling and the amount of heat dissipated from the bottom surface by cooling are adjusted by controlling at least one of sprayed water density, pressure and water temperature of each of the headers. - The method for cooling a hot-rolled steel sheet according to Claim 1 or 2,
wherein cooling in the cooling section is carried out at a temperature of the hot-rolled steel sheet in a range of 600°C or higher.
Applications Claiming Priority (1)
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PCT/JP2012/081670 WO2014087524A1 (en) | 2012-12-06 | 2012-12-06 | Method for cooling hot-rolled steel sheet |
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EP2764932A1 true EP2764932A1 (en) | 2014-08-13 |
EP2764932A4 EP2764932A4 (en) | 2015-06-24 |
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EP (1) | EP2764932B1 (en) |
JP (1) | JP5310965B1 (en) |
KR (1) | KR101467724B1 (en) |
CN (1) | CN103987470B (en) |
BR (1) | BR112013028835B1 (en) |
WO (1) | WO2014087524A1 (en) |
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JP6176730B2 (en) * | 2014-02-19 | 2017-08-09 | Kddi株式会社 | Clustering apparatus, method and program |
CN106493179B (en) * | 2016-12-25 | 2018-08-21 | 首钢集团有限公司 | A kind of method that section length calculating is subcooled in steel plate Cooling Process end to end |
JP6911997B2 (en) * | 2019-02-07 | 2021-07-28 | Jfeスチール株式会社 | Cooling control method for thick steel sheets, cooling control device and manufacturing method for thick steel sheets |
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JPH0763750B2 (en) * | 1988-12-28 | 1995-07-12 | 新日本製鐵株式会社 | Cooling control device for hot rolled steel sheet |
JPH05337505A (en) | 1992-06-11 | 1993-12-21 | Kawasaki Steel Corp | Method for controlling cooling of material to be rolled in hot rolling |
JPH06328117A (en) * | 1993-05-18 | 1994-11-29 | Nippon Steel Corp | Method for injecting water in rot cooling of continuous hot rolling |
JP3480366B2 (en) * | 1999-05-07 | 2003-12-15 | 住友金属工業株式会社 | Control method of winding temperature of hot rolled steel sheet |
JP4586314B2 (en) | 2001-07-31 | 2010-11-24 | Jfeスチール株式会社 | Manufacturing method of hot-rolled steel sheet |
JP3892834B2 (en) | 2003-08-29 | 2007-03-14 | 新日本製鐵株式会社 | Thick steel plate cooling method |
JP2005271052A (en) | 2004-03-25 | 2005-10-06 | Jfe Steel Kk | Hot-rolling method |
US9364879B2 (en) * | 2007-07-19 | 2016-06-14 | Nippon Steel & Sumitomo Metal Corporation | Cooling control method, cooling control apparatus, and cooling water amount calculation apparatus |
JP5482070B2 (en) * | 2009-10-02 | 2014-04-23 | 新日鐵住金株式会社 | Method and apparatus for cooling hot-rolled steel sheet |
EP2361699A1 (en) * | 2010-02-26 | 2011-08-31 | Siemens Aktiengesellschaft | Method for cooling sheet metal with a cooling section, cooling section and control and/or regulating device for a cooling section |
CN102166582B (en) * | 2010-12-13 | 2013-02-27 | 河北省首钢迁安钢铁有限责任公司 | Method for improving control precision of coiling temperature |
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- 2012-12-06 BR BR112013028835-3A patent/BR112013028835B1/en active IP Right Grant
- 2012-12-06 CN CN201280010631.0A patent/CN103987470B/en active Active
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BR112013028835A2 (en) | 2017-01-31 |
KR101467724B1 (en) | 2014-12-01 |
EP2764932B1 (en) | 2018-02-07 |
CN103987470A (en) | 2014-08-13 |
BR112013028835B1 (en) | 2022-08-09 |
EP2764932A4 (en) | 2015-06-24 |
KR20140107102A (en) | 2014-09-04 |
CN103987470B (en) | 2015-09-09 |
JP5310965B1 (en) | 2013-10-09 |
WO2014087524A1 (en) | 2014-06-12 |
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