WO2007099676A1 - 熱延鋼帯の冷却装置および冷却方法 - Google Patents
熱延鋼帯の冷却装置および冷却方法 Download PDFInfo
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- WO2007099676A1 WO2007099676A1 PCT/JP2006/322798 JP2006322798W WO2007099676A1 WO 2007099676 A1 WO2007099676 A1 WO 2007099676A1 JP 2006322798 W JP2006322798 W JP 2006322798W WO 2007099676 A1 WO2007099676 A1 WO 2007099676A1
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- Prior art keywords
- steel strip
- cooling
- nozzle
- cooling water
- hot
- Prior art date
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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
- 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
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
-
- 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
- B21B45/0269—Cleaning
- B21B45/0275—Cleaning devices
- B21B45/0278—Cleaning devices removing liquids
- B21B45/0281—Cleaning devices removing liquids removing coolants
-
- 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
- B21B45/04—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 de-scaling, e.g. by brushing
- B21B45/06—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 de-scaling, e.g. by brushing of strip material
-
- 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
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
Definitions
- the present invention relates to a cooling apparatus and a cooling method for cooling a hot-rolled steel strip.
- a slab is heated to a predetermined temperature in a heating furnace, and the heated slab is rolled to a predetermined thickness with a roughing mill to form a rough bar.
- a continuous hot finish rolling mill consisting of a number of rolling stands, the steel strip has a predetermined thickness.
- the steel strip is manufactured by cooling it with a cooling device on the run-out table and then scraping it with a scraper.
- the run-out table cooling device that cools hot-rolled high-temperature steel strip in a continuous manner is used to cool the top of the steel strip, so that a roller table for transporting the steel strip from a circular laminar cooling nozzle is used. On top of this, a plurality of laminar cooling waters are poured linearly across this width direction. On the other hand, in order to cool the bottom surface of the steel strip, a spray nozzle is provided between each roller table, and a method of spraying cooling water from this is generally used.
- the cooling water from the circular pipe laminar nozzle used for cooling the upper surface of the steel strip is a free fall flow, so there is a water film on the upper surface of the steel strip.
- the cooling water is difficult to reach the steel strip and there is a difference in cooling capacity between the case where there is stagnant water on the upper surface of the steel strip and the cooling water that has fallen on the steel strip As it expands, the cooling area (cooling zone) changes, and the cooling capacity is not stable. As a result of such fluctuations in cooling capacity, the steel strip material tends to be uneven. '
- Patent Document 2 See, for example, Patent Document 2.
- Patent Document 1 Japanese Patent Laid-Open No. 9 1 1 4 1 3 2 2
- Patent Document 2 Japanese Patent Application Laid-Open No. 10-1 6 60 23
- Patent Document 3 Japanese Patent Laid-Open No. 2 0 0 2-2 3 9 6 2 3
- the present invention has been made in consideration of the above-mentioned circumstances, and its purpose is to realize a high cooling capacity and a stable cooling region when cooling a hot-rolled steel strip with cooling water.
- the present invention is intended to provide a hot strip steel strip chilling apparatus and a cooling method that can uniformly cool the steel strip from the tip to the tail.
- the present invention has the following features.
- a plurality of cooling nozzles for injecting rod-shaped cooling water are arranged on the upper surface side of the steel strip so that the injection angle is inclined toward the upstream side in the traveling direction of the steel strip,
- a hot-rolled steel strip cooling device characterized in that a draining means for draining the cooling water on the upper surface of the steel strip sprayed from the cooling nozzle is arranged on the upstream side.
- a plurality of the cooling nozzles are arranged in the steel strip width direction and a plurality of rows are arranged in the steel strip traveling direction.
- the width direction position of the cooling nozzles arranged in each row is arranged by shifting the width direction position in the upstream row and the width direction position in the downstream row.
- the draining means is one or more nozzles for ejecting a draining fluid from a slit-like or circular nozzle jet so that the jet angle is inclined toward the downstream side in the traveling direction of the steel strip.
- the hot-rolled steel strip cooling device according to any one of [1] to [4], wherein
- the cooling water is drained by draining means provided on the upstream side. To cool the hot-rolled steel strip.
- a pinch roll is used as the water draining means, and the pinch roll is previously set with a gap equal to or less than the thickness of the steel strip. After the tip of the steel strip is pinched, the cooling water starts to be sprayed.
- a slit-shaped or circular nozzle for injecting a draining fluid from a circular nozzle injection port is used in the draining means, and the upstream of the strip in the traveling direction.
- One or more of the amount of water in the nozzle for injecting the draining fluid, the water pressure, and the number of rows of spray nozzles is changed according to the number of rows of rod-shaped cooling water spray nozzles that are inclined and sprayed toward The method for cooling a hot-rolled steel strip as described in [8] above.
- the steel strip can be uniformly cooled from the tip to the tail, and the quality of the steel strip is stabilized. Along with this, the yield increases as the steel strip cuts off.
- FIG. 1 is a configuration diagram of rolling equipment in the first and second embodiments of the present invention.
- FIG. 2 is a configuration diagram of the cooling device according to the first embodiment of the present invention.
- FIG. 3 is a detailed view of the cooling device according to the first embodiment of the present invention.
- FIG. 4 is a configuration diagram of a cooling device according to the second embodiment of the present invention.
- FIG. 5 is a detailed view of the cooling device according to the second embodiment of the present invention.
- FIG. 6 is a configuration diagram of a cooling device according to the second embodiment of the present invention.
- FIG. 7 is p] explaining the collision position of the cooling device of the present invention.
- FIG. 8A and FIG. 8B are detailed views of the cooling device main body in the first and second embodiments of the present invention and the rod-shaped cooling water injection nozzle of the water draining means in the second embodiment.
- FIG. 9 is a configuration diagram of the rolling equipment in the third embodiment of the present invention.
- Cooling water supply pipe 1 7 Cooling water supply pipe 1 7 .
- Rod-shaped cooling water injection nozzle as a draining means BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows a production facility for hot-rolled steel strip in the first embodiment of the present invention.
- the coarse bar 2 rolled by the coarse rolling mill 1 is conveyed on the table roller 3 and continuously rolled to a predetermined thickness by seven continuous finish rolling mill groups 4 to become a steel strip 1 2, and finally Finished rolling mill 4 E is guided to runout table 5 constituting the steel strip conveyance path behind E.
- This run-out table 5 has a total length of about 100 m, and a cooling device is provided in part or almost most of it. After the steel strip 1 2 is cooled here, the downstream scraper 1 Scattered at 3 to form a hot rolled coil.
- the conventional cooling device 6 and the cooling device 10 of the present invention are arranged in this order as the cooling device for cooling the upper surface of the steel strip provided on the run-out table 5.
- the conventional cooling device 6 includes a plurality of circular laminar nozzles 7 that are arranged at a predetermined pitch on the upper surface side of the run-out table 5 and supply cooling water to the steel strip as a free fall flow.
- a cooling device for cooling the lower surface of the steel strip a plurality of spray nozzles 9 are arranged between the table rollers 8 for transporting the steel strip.
- the configuration around the cooling device 10 according to the first embodiment of the present invention is as shown in FIG.
- a cooler main body 10 a described later is provided on the upper surface side of the run-out table 5, and a pinch roll 11 serving as a draining means is provided on the upstream side thereof.
- the structure on the lower surface side of the steel strip is the same as that of the conventional cooling device 6, for example, for conveying a rotating steel strip having a diameter of about 35 O mm at a pitch of about 40 O mm in the traveling direction of the steel strip.
- Table rollers 8 are arranged, and these table rollers 8 are located on the lower surface side of the steel strip 12.
- the configuration of the cooling device body 10 0 a is as shown in FIG. That is, cooling water
- the circular pipe nozzles 15 arranged in a row at a predetermined pitch (for example, 30 min pitch) in the steel strip width direction on the sluice header 14 have a predetermined pitch (for example, 10: 0: nm pitch) in the steel strip traveling direction. ) And a predetermined number of columns (for example, 1 0 0 columns).
- the circular pipe nozzle 15 is connected to the cooling water supply pipe 16 through one cooling water nozzle header 14 for each row, and each cooling water supply pipe 16 is independently connected. On-off control is possible.
- the circular pipe nozzle 15 is a straight pipe nozzle having a predetermined inner diameter (for example, ⁇ ⁇ ⁇ ) and a smooth inner surface, and the cooling water supplied from the circular pipe nozzle 15 is a rod-shaped cooling water.
- the height of the outlet of the circular tube nozzle 15 is set to a predetermined height from the upper surface of the steel strip 1 2 (for example, 1) so that it does not contact the circular tube nozzle 15 even if the steel strip 1 2 moves up and down. (0 0 0 mm).
- the rod-shaped cooling water in the present invention is cooling water that is injected in a state of being pressurized to some extent from a circular (including elliptical or polygonal) nozzle outlet, and from the nozzle outlet.
- the cooling water injection speed is 7 m / s or more, and the water flow from the nozzle outlet to the steel strip is maintained in a circular shape, and the water flow is continuous and straight. . In other words, it is different from a free fall flow from a circular tube lamina nozzle or a droplet ejected in the form of a spray.
- the pinch roll 11 which is a draining means is installed on the table roll 8 upstream of the cooling device body 10 a and is a roll of a predetermined size (for example, a diameter of 2500 mm).
- a predetermined size for example, a diameter of 2500 mm.
- the pinch roll 11 is driven to rotate and can be moved up and down so as to be in rolling contact with the steel strip 12.
- the holding of the height position can be arbitrarily changed.
- the gap (gap) between the pinch roll 1 1 and the taper roller 8 is set in advance to be smaller than the thickness of the steel strip 12 (for example, 1 mm thick), and the steel strip exiting the finishing mill 1 2 After the tip of the pin passes the pinch roll 1 1, the cooling device main body 1 0 a After reaching the outlet side, the injection of cooling water from the circular tube nozzle 15 starts It has become.
- a drive motor (not shown) for rotating and driving the pinch roll 11 is connected to the side portion of the pinch roll 11, and the pinch roll 11 is made of steel strip by this drive motor. 1 The rotation speed is adjusted so that the peripheral speed matches the transport speed of 2.
- the cooling device body 10 0 a and the pinch roll 1 1 are located at the position where the cold water sprayed from the circular tube nozzle arranged in the foremost row (row on the most upstream side) reaches the steel strip 1 2.
- the roll 11 is adjusted so that it is on the downstream side of the position where the roll 11 contacts the steel strip 12.
- the cooling device 10 is arranged in a plurality of circles that are inclined so as to inject the rod-shaped cooling water toward the upstream side in the traveling direction of the steel strip 12 at an injection angle of 0. Since it has a pinch roll 1 1 that is arranged on the upstream side of the tube nozzle 15 and sandwiches the steel strip 1 2 between the roller table 8 and the upper surface of the steel strip 1 2 from the circular tube nozzle 15 The supplied cooling water (stagnant water) flows toward the upstream side of the steel strip 12 in the direction of travel, and the flowing stagnant water is blocked by the pinch roll 1 1. The cooling area becomes constant. And since the rod-shaped cooling water is jetted from the circular pipe nozzle 15, fresh water can reach the steel strip 12 by breaking the water film on the upper surface of the steel strip 12.
- the tip of the steel strip has a wave-like shape, and cooling water has selectively accumulated in the bottom part where waves are waved up and down.
- the stagnant water does not flow outside the device (upstream side).
- the angle 0 formed by the rod-shaped cooling water sprayed from the circular tube nozzle 15 and the steel strip 12 is 55 ° or less.
- the cooling water (residual water) after reaching the steel strip 1 2 The velocity component is reduced, interfering with the accumulated water in the upstream row, and the flow of the accumulated water is obstructed, so that the arrival position of the rod-shaped cooling water from the most downstream circular tube nozzle 15 ( There is a risk that some of the accumulated water will flow downstream from the collision position and the cooling area will not be stable.
- the faster the travel speed the easier it is for the stagnant water to flow downstream.
- the angle 0 is set to 55 ° or less, and to the traveling speed of the steel strip. Accordingly, it is preferable to adjust in the range of 30 ° to 55 °. However, if the angle 0 is smaller than 30 °, and if the height position from the steel strip 1 2 is maintained at a predetermined value, the circular nozzle 1 5 will reach the position where the rod-shaped cooling water reaches (collision position).
- the distance between the rod-shaped cooling water and the steel strip 12 is preferably 30 ° or more. It is.
- the circular pipe nozzle 15 that forms rod-shaped cooling water is used as the permanent cooling nozzle for the following reason.
- the cooling water it is necessary to ensure that the cooling water reaches the steel strip and collides with it.
- the water film on the upper surface of the steel strip 1 2 must be broken to allow fresh cooling water to reach the steel strip 1 2, and the penetrating force like droplets ejected from the spray nozzle can be obtained. It should be not a weak cooling water flow but a cooling water flow with high piercing power that is continuous and straight.
- the circular pipe nozzle 15 (which may be an ellipse or a polygon) may be used, and the injection speed of the cooling water from the nozzle outlet may be reduced! ! ! No.
- the relative speed is higher than the speed when the fluid travels in the opposite direction of the steel strip (fluid speed X cos ⁇ ) and the relative speed is perpendicular to the steel strip. If there is, the water flow does not disperse, and the stagnant water existing on the steel strip is broken to reach the steel strip, enabling stable cooling.
- the method of jetting cooling water from diagonally above with the cooling water going backwards in the direction of travel of the steel strip with respect to the steel strip is more impactful than the conventional cooling method in which the cooling water is dropped vertically to the steel strip. Since the relative speed of is large, the cooling efficiency is good. In addition, the cooling speed is excellent because the relative speed between the cooling water and the steel strip is large compared to the case of injecting the cooling water from the rear to the front of the steel strip.
- the thickness of the rod-shaped cooling water is preferably about several mm, and at least 3 mm. If it is less than 3 mm, it will be difficult to break through the stagnant water on the steel strip and cause the cooling water to collide with the steel strip.
- the collision position of the rod-shaped cooling water in the previous row (upstream side) and the collision position of the rod-shaped cooling water in the next row (downstream side) are in the width direction. It is preferable to dispose them apart.
- the nozzles in the next row have the same mounting pitch in the width direction as in the previous row, and the width direction mounting position is shifted by a distance of 13 of the width direction nozzle mounting pitch.
- the next row in the next row, it may be installed at the center of the adjacent nozzle in the previous row. As a result, the next row is placed in the portion where the cooling between the rod-shaped cooling waters adjacent in the width direction becomes weak. The rod-shaped cooling water collides with each other, the cooling is completed, and uniform cooling is performed in the width direction.
- the distance between the pinch roll 11 and the roller table 8 is set in advance to be smaller than the plate thickness of the steel strip 12 (for example, plate thickness is 1 lmm), After the end of the steel strip 1 2 exiting the finishing mill passes the pinch roll 1 1 and then reaches the cooling device body 1 0 a circular pipe nozzle; starts to inject cooling water from L 5
- the tip of the steel strip may be allowed to pass through where the cooling water has been sprayed in advance. In this way, predetermined cooling can be performed from the end of the steel strip 12.
- the jet should not interfere with the passage of the steel strip 1 2 tip. It is also possible to inject the cooling water with pressure and change the injection pressure to a predetermined value after the steel strip tip has swallowed into the pinch roll 11. However, since the vertical movement of the steel strip 1 2 generated between the finish rolling mill 4 and the pinch roll 11 is suppressed by the pinch roll 11, the tip of the steel strip passing through the cooling device body 10 a The passage plate is relatively stable compared to the case without the pinch roll 1 1, and even if the cooling water starts to be injected before the tip of the steel strip 1 2 reaches the cooling device body 1 0 a Less is.
- the pinch roll 1 1 is rotated slightly so that the gap is equal to or greater than the thickness of the steel strip 1 2. (For example, up to plate thickness + 1 mm). Even in this state, the cooling water on the steel strip 1 2 hardly passes through the upstream side of the pinch roll 1 1, and “pinch roll 1 1 realizes good drainage. By the way, the reason why the pinch roll 11 is slightly raised is to prevent the slack from occurring in the steel strip due to a slight mismatch between the rotational speed of the pinch roll and the traveling speed of the steel strip.
- the jet of cooling water is adjusted as follows based on the traveling speed, temperature, etc. of the steel strip 12.
- the length of the cooling zone that is, the circular pipe that injects rod-shaped cooling water, based on the speed of the steel strip 1 2, the measured temperature of the steel strip 1 2, and the cooling temperature amount to the target cooling stop temperature
- the number of rows of nozzles 15 and the obtained circular tube nozzle 1 5 rows Set so that the number of pinch rolls is preferentially ejected from the side closer to 1.
- the number of rows of the circular pipe nozzles 15 to be injected is changed while taking into account the change in the speed of the steel strip 12 (acceleration-deceleration) by looking at the actual temperature value of the steel strip 12 after cooling. To do. It is desirable to change the cooling zone length by changing the number of nozzles to be ejected by always injecting the nozzle rows on the pinch roll 11 side and sequentially turning on and off the downstream nozzle rows.
- the main role of the pinch roll 11 is to keep the cooling area constant by cooling water by blocking the cooling water from the cooling device body 10a. Therefore, as will be described later in the second embodiment of the present invention, the draining means is not limited to the pinch roll 11 as described above, but the cooling of the upper surface of the steel strip injected from the circular pipe nozzle 15. As long as the water can be drained, various forms can be used. .
- a nozzle for injecting a draining fluid as a draining means in place of the pinch roll 11 in the first embodiment, a nozzle for injecting a draining fluid as a draining means, particularly a rod-shaped cooling water injection nozzle is installed.
- the rod-shaped cooling water as the draining means is not intended for cooling, but like the rod-shaped cooling water from the circular tube nozzle 15 in the first embodiment, the cooling water is used in a pressurized state. Since it uses a continuous and straight water flow in which the cross-section of the water flow from the nozzle outlet to the steel strip is maintained in a substantially circular shape, it will be called rod-shaped cooling water.
- the configuration of the hot-rolled steel strip manufacturing facility in the second embodiment is almost the same as that of the hot-rolled steel strip manufacturing facility in the first embodiment shown in FIG.
- the configuration around the cooling device 10 in the form is as shown in FIG. That is, the runout table 5 is provided with a cooling device main body 10b to be described later, and a rod-shaped cooling water injection nozzle 19 as a draining means is provided on the downstream side thereof.
- the configuration on the lower surface side of the steel strip is the same as in the first embodiment.
- the configuration f of the cooling device main body 10 0 b is as shown in FIG.
- the circular pipe nozzles 1 5 arranged on the cooling water nozzle header 1 4 at a predetermined pitch (for example, 60 mm pitch) in the steel strip width direction.
- steel strip A predetermined number of columns for example, 100 columns
- each circular nozzle is connected to the cooling water supply pipe 16 through one cooling water nozzle header 14 for each row, and each cooling water
- the supply pipe 1 6 ⁇ could be controlled on and off independently, but in the cooling device main body 1 0 b of the second ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇
- the cooling water supply pipes 16 are connected to the cooling water supply pipes 16 through 4, and each of the cooling water supply pipes 16 can be independently controlled on and off using this as a control unit.
- the concept of the diameter, spray angle, nozzle height, etc. of the circular tube nozzle 15 is the same as in the first embodiment.
- the cooling device body 10 0 b performs on / off control with two rows of circular tube nozzles as control units.
- the purpose of performing this on / off control is to adjust the temperature at the end of cooling. How many times the circular nozzles can be turned on and how to set the allowable accuracy of the cooling end temperature.
- the control unit (number of nozzle rows) for on-off control is determined by. In the case of the above configuration, there is the ability to cool about 1 to 3 ° C per row of circular tube nozzles. For example, when aiming for a temperature accuracy of ⁇ 5 ° C, it is on with a resolution of about 5 to 10 ° C.
- the temperature can be adjusted at 5 ° C with one on / off operation, the temperature can be controlled with sufficient accuracy if the two nozzles can be turned on / off with one cooling water supply tube 16 on / off. Adjustment is possible.
- ON / OFF control is performed using multiple rows of circular tube nozzles as a control unit in this way, the number of shut-off valves, which are equipment required for ON / OFF control, can be reduced, and the number of pipes can be reduced. This makes it possible to manufacture equipment at low cost.
- the control unit (number of rows of circular pipe nozzles) in the on / off mechanism of 1 mm may be changed depending on the location with respect to the longitudinal direction (steel strip traveling direction).
- the rod-shaped cooling water injection nozzle 19 which is a draining means is disposed upstream of the cooling device body 1 Ob with a predetermined nozzle diameter (for example, inner diameter 5 mm) and nozzle pitch (for example, 40 mm).
- the rod-shaped cooling water inclined toward the cooling device main body 10 b side (downstream side) is sprayed.
- the angle 77 formed by the rod-shaped cooling water sprayed from the rod-shaped cooling water spray nozzle 1 9 and the steel strip 1 2 is the angle 0 of the rod-shaped cooling water sprayed from the cooling device main body 10 0 a (1 0 b) described above.
- a close idea can be applied, and it is preferable that the angle is 60 ° or less.
- the injection angle 77 exceeds 60 °, the velocity component in the direction of travel of the cooling water (residual water) after reaching the steel strip 1 2 becomes smaller, and the jet is injected from the cooling device body 1 Ob on the downstream side.
- the rod-shaped cooling water injection nozzle 19 injects toward the downstream side of the steel strip traveling direction, but the stagnant water is originally due to the shearing force generated between the steel strip and the steel strip traveling direction. Tend to leak. For this reason, the accumulated water is not likely to leak to the upstream side of the steel strip, so it may be increased within 5 ° from the injection angle ⁇ of the rod-shaped cooling water from the cooling unit body 10 b installed downstream in the traveling direction. Absent.
- the rod-shaped cooling water sprayed from the rod-shaped cooling water spray nozzle 19 needs to have a force that receives the rod-shaped cooling water from the cooling device main body 10 b and does not flow upstream. Therefore, when the number of rows of the circular tube nozzles 15 of the cooling device main body 10 b used is large, it is preferable to increase the flow rate, flow velocity, and water pressure from the rod-shaped cooling water injection nozzles 19 to stabilize the draining ability. Or, as shown in Fig. 5, the rod-shaped cooling water injection nozzles 19 for draining means are installed in multiple rows (for example, 5 rows) in the direction of steel strip travel, and the circular tube nozzles 15 of the cooling device body 1 Ob are used. Depending on the number of rows, the number of rows of rod-shaped coolant injection nozzles 19 may be changed.
- the cooling device body 10 b and the rod-shaped cooling water injection nozzle 19 are the rod-shaped cooling water sprayed from the circular pipe nozzles arranged in the front row (upstreammost row) of the cooling device body 10 b. Is the downstream side of the position where the rod-shaped cooling water sprayed from the rod-shaped coolant injection nozzle 19 in the last row (the most downstream row) reaches the steel strip 1 '2 (For example, 10 O mm).
- the injection pressure should be sufficient to prevent passage of the tip of steel strip 12 It is also possible to inject the cooling water and change the injection pressure to a predetermined value after the end of the steel strip has swollen into the coiler.
- the tip of the steel strip may be allowed to pass through where the cooling water has been sprayed in advance. In this way, predetermined cooling can be performed from the end of the steel strip 12.
- the example in which the nozzle for injecting the rod-shaped cooling water is used as the nozzle for injecting the water draining fluid that is the draining means As the draining means, a nozzle that ejects rod-shaped cooling water with a high momentum is preferable from the viewpoint of keeping rod-shaped reject water from the cooling device body 10 b, but it is not always necessary to be a nozzle that ejects rod-shaped cooling water. Alternatively, a nozzle that ejects a plate-like slit flow may be used. Absent. Further, the cooling water injection speed from the nozzle outlet may be less than 7 ⁇ s, or the cooling water may have some droplets without being continuous.
- the conventional cooling device 6 and the cooling device 10 of the present invention are arranged in that order in the run-out table 5 as shown in FIG. did.
- uniform and stable cooling can be performed by the cooling device 10 of the present invention.
- the cooling stop temperature can be made uniform over the entire length of the steel strip.
- the present invention is not limited to this embodiment.
- the conventional cooling device 6 and the cooling device 10 of the present invention may be in the reverse order, or the cooling device of the present invention. Only 10 may be provided.
- the present invention may be an embodiment (third embodiment) as shown in FIG.
- a steel strip as described in Patent Document 3 is provided between the final finishing mill 4E and the cooling device 6.
- Cooling equipment 1 7 and pinch rolls 1 8 that can be strongly cooled close to each other are installed, and equipment suitable for the production of duplex stainless steel that requires two stages of cooling immediately before finishing rolling and just before rolling. It has become. If necessary, it is also possible to cool by jetting using a conventional cooling device 6 between two cooling devices. In some cases, the conventional cooling device 6 may not be provided.
- the two-stage cooling can be performed uniformly from the tip of the steel strip 12 to the tail end, and the quality of the steel strip 12 is stabilized. . Along with this, the steel strip cutting allowance is reduced and the yield is increased.
- Example 1 (Invention Example 1)
- the present invention was implemented based on the first embodiment. That is, the equipment configuration shown in Fig. 1 is used, and the cooling device body 10a enables on / off control of rod-shaped cooling water with a circular tube nozzle as a control unit as shown in Fig. 3, and Fig. 8 B In this way, the width of the next row was shifted by 1/2 of the mounting width of the nozzle in the width direction of the previous row. In addition, as shown in Fig. 2, a pinch roll 11 was installed upstream of the cooling device body 10 a.
- the steel strip with a finished sheet thickness of 2.8 mm is used, and the steel strip speed at the finishing mill 4 outlet is 70 mpm at the steel strip tip, and the steel strip tip reaches the scraper 1 3 After that, the speed was increased gradually to a maximum of l OOO mpm (16.7 m / s).
- Finishing mill 4 The temperature of the steel strip at the outlet is 85 ° C., which is cooled to approximately 65 ° C. using the conventional cooling device 6 and is the scraping temperature of the eyes after that 4 0 0 Up to ° C, the cooling device 10 of the present invention was used for cooling. The allowable temperature deviation of the scraping temperature was 20 ° C.
- the injection angle ⁇ of the circular tube nozzle 15 was set to 50 °, and rod-shaped cooling water was injected from the circular tube nozzle 15 at an injection speed of 30 m / s.
- the distance between the pinch roll 1 1 and the table roller 8 was set to a thickness of 1 mm (ie, 1.8 mm) in advance. Then, let the steel strip tip pass under the condition that rod-shaped cooling water is jetted in advance under the prescribed conditions. When the steel strip tip is scraped off by the winder 13 and tension is applied, the pinch roll 11 is raised 2 mm. It was. Even in this state, the cooling water on the steel strip hardly slips upstream of the pinch roll 11 1, and a good drainage was realized by the pinch roll 11 1.
- the number of rows of the circular pipe nozzles 15 for injecting the rod-shaped cooling water is determined based on the traveling speed of the steel strip, the measured temperature value of the steel strip, and the cooling temperature amount up to the target cooling stop temperature.
- the nozzle 15 was set so that it was preferentially ejected from the side closer to the pinch roll 1 1 by the number of rows. From then on, as the traveling speed of the steel strip 12 increased, the line of circular tube nozzles 15 for injecting rod-shaped cooling water was stated downstream.
- Example 1 of the present invention the steel strip temperature in the scraper 13 is within 400 ° C ⁇ 1 and is very uniform from the tip to the tail of the steel strip within the target temperature deviation. Cooling could be realized.
- the present invention was implemented based on the second embodiment. That is, as described above, the equipment configuration is almost the same as the equipment configuration shown in FIG. 1.
- the cooling device main body 10b has two rows of circular nozzles as control units, and rod-shaped cooling water. Enables on / off control, and as shown in Fig. 8B, the width direction mounting position of the next row is the distance of 1 to 2 of the nozzle width direction mounting pitch with respect to the width direction mounting position of the previous row. Just shifted.
- a plurality of rows of rod-shaped cooling water injection nozzles 19 as nozzles for injecting a draining fluid were installed on the upstream side of the cooling device main body 10b.
- the steel strip speed is 2.8 mm and the steel strip speed at the exit of the finishing mill 4 is 70 Ompm at the tip of the steel strip, and after the tip of the steel strip reaches the winder 1 3 The speed was increased to a maximum of 1 O O.Ompm (16.7 m / s).
- the temperature of the steel strip at the finish rolling mill 4 outlet is 85 ° C, and it is cooled down to approximately 65 ° C using the conventional cooling device 6, and after that it is the target scraping temperature 4 0 0 Up to ° C, the cooling device 10 of the present invention was used for cooling.
- the allowable temperature deviation of the scraping temperature was 20 ° C.
- the injection angle 0 of the circular tube nozzle 15 of the cooling device main body 10 b was set to 50 °, and rod-shaped cooling water was injected from the circular tube nozzle 15 at an injection speed of 35 m / s.
- the injection angle ⁇ of the rod-shaped cooling water injection nozzle 19 which is a draining means is 50 °, and is the same angle as the circular tube nozzle 15 of the cooling device main body 10 b.
- a row of circular pipe nozzles 15 for injecting rod-shaped cooling water in the cooling device body 10 b The number was determined, and the number of rows of the obtained circular tube nozzles 15 was set to inject preferentially from the foremost row (row on the most upstream side). Thereafter, as the traveling speed of the steel strip 12 increased, the row of circular pipe nozzles 15 for injecting rod-shaped cooling water in the cooling device main body 10 b was extended downstream.
- the bowl-shaped cooling water injection nozzle 19 is set so as to preferentially inject from the last row (the row on the lowermost stream side), and the change in the number of rows used by the circular tube nozzle 15 in the cooling device body 10 b Depending on the amount of water in the rod-shaped cooling water injection nozzle 1 9 In the process, when the flow rate of the rod-shaped cooling water injection nozzle 19 reached the upper limit of the facility, the row of rod-shaped cooling water spray nozzles 19 to be injected was sequentially increased upstream.
- the tip of the steel strip was passed in a state in which the rod-shaped cooling water was jetted under predetermined conditions in advance, but the cooling water on the steel strip was upstream of the rod-shaped cooling water from the rod-shaped cooling water injection nozzle 19.
- the rod-shaped cooling water injection nozzle 19 was able to achieve good drainage.
- Example 2 of the present invention the steel strip temperature in the scraper 13 is within 400 ° C ⁇ 18 ° C, and it is extremely high from the tip of the steel strip to the tail end within the target temperature deviation. Uniform cooling was achieved.
- the steel strip was cooled without using the cooling device 1 ° of the present invention in the equipment shown in FIG. At that time, only the conventional cooling device 6 was used to cool to the target scraping temperature of 400 ° C.
- the allowable temperature deviation of the scraping temperature was ⁇ 20 ° C.
- the other conditions are the same as in the above-mentioned Example 1 of the present invention.
- hunting of the cooling temperature was observed in the longitudinal direction of the steel strip. This is presumed that the accumulated water stays at the bottom of the steel strip, causing uneven temperature in the longitudinal direction. Therefore, the steel strip temperature in the scraper 13 is 3 0 0 against the target temperature deviation ( ⁇ 20 ° C). There was a large variation from C to 4 20, which resulted in a large variation in strength within the steel strip.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Metal Rolling (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2644514A CA2644514C (en) | 2006-03-03 | 2006-11-09 | Hot-strip cooling device and cooling method |
CN200680053699.1A CN101394946B (zh) | 2006-03-03 | 2006-11-09 | 热轧钢带的冷却装置及冷却方法 |
KR1020087021583A KR101144028B1 (ko) | 2006-03-03 | 2006-11-09 | 열연 강 스트립의 냉각 장치 및 냉각 방법 |
US12/224,195 US8231826B2 (en) | 2006-03-03 | 2006-11-09 | Hot-strip cooling device and cooling method |
BRPI0621377-4A BRPI0621377B1 (pt) | 2006-03-03 | 2006-11-09 | Dispositivo de resfriamento de tira quente e método de resfriamento |
EP06832688.3A EP1992426B1 (en) | 2006-03-03 | 2006-11-09 | Cooling apparatus for hot rolled steel band and method of cooling the steel band |
US13/471,552 US8444909B2 (en) | 2006-03-03 | 2012-05-15 | Hot-strip cooling device |
Applications Claiming Priority (2)
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JP2006057119 | 2006-03-03 | ||
JP2006-057119 | 2006-03-03 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US12/224,195 A-371-Of-International US8231826B2 (en) | 2006-03-03 | 2006-11-09 | Hot-strip cooling device and cooling method |
US13/471,552 Division US8444909B2 (en) | 2006-03-03 | 2012-05-15 | Hot-strip cooling device |
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WO2007099676A1 true WO2007099676A1 (ja) | 2007-09-07 |
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PCT/JP2006/322798 WO2007099676A1 (ja) | 2006-03-03 | 2006-11-09 | 熱延鋼帯の冷却装置および冷却方法 |
Country Status (7)
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US (2) | US8231826B2 (ja) |
EP (1) | EP1992426B1 (ja) |
KR (1) | KR101144028B1 (ja) |
CN (1) | CN101394946B (ja) |
BR (1) | BRPI0621377B1 (ja) |
CA (1) | CA2644514C (ja) |
WO (1) | WO2007099676A1 (ja) |
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WO2011001849A1 (ja) * | 2009-06-30 | 2011-01-06 | 住友金属工業株式会社 | 鋼板の冷却装置、熱延鋼板の製造装置、及び鋼板の製造方法 |
WO2011007648A1 (ja) * | 2009-07-15 | 2011-01-20 | 住友金属工業株式会社 | 熱延鋼板の製造装置、及び鋼板の製造方法 |
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DE102007055475A1 (de) | 2007-06-27 | 2009-01-08 | Sms Demag Ag | Kühlvorrichtung zum Kühlen eines Metallbandes |
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- 2006-11-09 WO PCT/JP2006/322798 patent/WO2007099676A1/ja active Application Filing
- 2006-11-09 KR KR1020087021583A patent/KR101144028B1/ko active IP Right Grant
- 2006-11-09 EP EP06832688.3A patent/EP1992426B1/en active Active
- 2006-11-09 US US12/224,195 patent/US8231826B2/en active Active
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Also Published As
Publication number | Publication date |
---|---|
EP1992426A4 (en) | 2012-07-04 |
CA2644514C (en) | 2012-01-17 |
KR20080091393A (ko) | 2008-10-10 |
US8444909B2 (en) | 2013-05-21 |
KR101144028B1 (ko) | 2012-05-09 |
EP1992426A1 (en) | 2008-11-19 |
BRPI0621377B1 (pt) | 2019-07-02 |
BRPI0621377A2 (pt) | 2011-12-06 |
CN101394946A (zh) | 2009-03-25 |
US20090019907A1 (en) | 2009-01-22 |
US20120222445A1 (en) | 2012-09-06 |
US8231826B2 (en) | 2012-07-31 |
CN101394946B (zh) | 2015-12-02 |
CA2644514A1 (en) | 2007-09-07 |
EP1992426B1 (en) | 2013-07-10 |
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