WO2018073973A1 - 熱延鋼板の冷却方法及び冷却装置 - Google Patents
熱延鋼板の冷却方法及び冷却装置 Download PDFInfo
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- WO2018073973A1 WO2018073973A1 PCT/JP2016/081947 JP2016081947W WO2018073973A1 WO 2018073973 A1 WO2018073973 A1 WO 2018073973A1 JP 2016081947 W JP2016081947 W JP 2016081947W WO 2018073973 A1 WO2018073973 A1 WO 2018073973A1
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- Prior art keywords
- cooling
- steel sheet
- meeting
- hot
- rolled steel
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 324
- 239000010959 steel Substances 0.000 title claims abstract description 324
- 238000001816 cooling Methods 0.000 title claims description 207
- 238000000034 method Methods 0.000 title claims description 19
- 239000007921 spray Substances 0.000 claims abstract description 266
- 239000000498 cooling water Substances 0.000 claims abstract description 81
- 230000032258 transport Effects 0.000 claims description 91
- 238000002347 injection Methods 0.000 claims description 27
- 239000007924 injection Substances 0.000 claims description 27
- 238000005096 rolling process Methods 0.000 claims description 26
- 238000009835 boiling Methods 0.000 claims description 20
- 238000009434 installation Methods 0.000 claims description 20
- 238000005098 hot rolling Methods 0.000 claims description 19
- 238000011144 upstream manufacturing Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 40
- 230000000052 comparative effect Effects 0.000 description 32
- 238000004804 winding Methods 0.000 description 20
- 239000000463 material Substances 0.000 description 17
- 238000010438 heat treatment Methods 0.000 description 9
- 238000012795 verification Methods 0.000 description 9
- 238000004088 simulation Methods 0.000 description 8
- 238000012546 transfer Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 239000012530 fluid Substances 0.000 description 6
- 238000005507 spraying Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 241000219307 Atriplex rosea Species 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- -1 for example Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- 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
-
- 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
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
- C21D9/5735—Details
Definitions
- the present invention relates to a method and apparatus for cooling a hot-rolled steel sheet after finish rolling in a continuous hot rolling process.
- the hot-rolled steel sheet after finish rolling in the continuous hot rolling process has a predetermined temperature by a cooling device provided above and below the run-out table, for example, in a run-out table installed between the finishing mill and the winding device. Then, it is wound up by a winding device.
- the cooling capacity after finish rolling is an important factor that determines the mechanical properties, workability, weldability, etc. of the hot-rolled steel sheets. It is important to cool to a temperature of
- Patent Document 1 includes a first cooling step followed by a second cooling step in a method of cooling a hot-rolled steel strip after hot rolling by bringing it into contact with cooling water.
- the cooling is stopped at a steel strip temperature higher than the transition boiling start temperature, and in the subsequent second cooling process, cooling is performed with cooling water having a water amount density that causes nucleate boiling.
- the second cooling step it has been proposed to cool at least the upper surface of the steel strip by laminar cooling or jet cooling.
- the cooling water poured onto the upper surface of the steel strip is discharged by a draining means such as an injection nozzle that sprays a high-pressure fluid on the upper surface of the steel strip or a roll arranged in the width direction of the upper surface of the steel strip. It has also been proposed.
- Patent Document 2 includes a transport line having a table roller that transports a thick steel plate rolled from a rolling mill to a hot straightening machine, and a water spray device that sprays water on the front and back surfaces of the thick steel plate.
- a plurality of cooling nozzles for spraying water are disposed on the upstream side of the hot straightening machine on the conveyance line along both sides outside the conveyance line. It has been proposed to provide a rolling mill outlet-side water spray device.
- Patent Document 3 in a cooling device that injects cooling water onto the upper surface of a hot-rolled steel plate, the hot-rolled steel plate is sandwiched at two locations in the longitudinal direction of the hot-rolled steel plate, and a total of four locations in the width direction of the hot-rolled steel plate. It has been proposed that a cooling header is provided, and cooling water is jetted from the cooling nozzles attached to the respective cooling headers toward the four central portions.
- Patent Document 4 in a cooling device for injecting a cooling liquid from a plurality of cooling banks into a hot-rolled steel material fed from a finish rolling mill, a draining nozzle is provided between the plurality of cooling banks, and the draining is performed. It has been proposed that the nozzles are disposed on both lateral sides of the hot-rolled steel material and jet high-pressure water so as to cross the width direction of the hot-rolled steel material.
- Patent Document 5 in a cooling device that cools a hot-rolled material traveling on a hot run table with curtain-like cooling water dropped from a slit nozzle of a cooling water header, sprays are disposed on both sides of the hot run table. It has been proposed that the sprayed pressure water is directed from each spray so as to cross from the central portion in the width direction of the hot rolled material to the outer end. And the interference flow between the cooling water generated on the hot rolled material is removed by the pressure water from the spray.
- Patent Document 6 when the hot-rolled steel sheet before and after finish rolling is cooled, in the draining method of draining the cooling water sprayed on the hot-rolled steel sheet, one side of the hot-rolled steel sheet in the width direction is disclosed.
- cooling water is drained by a plurality of draining nozzles arranged side by side in the conveying direction of the hot-rolled steel plate in both directions and spraying the drained water in the width direction of the hot-rolled steel plate.
- JP 2008-110353 A International Publication WO2011 / 115277 Publication Japanese Patent Laying-Open No. 2015-073995 Japanese Examined Patent Publication No.59-013573 Japanese Utility Model Publication No. 57-106752 International Publication WO2016 / 006402
- the hot-rolled steel strip is caused by intermittent contact with the roll due to the fluttering of the hot-rolled steel strip or vibration when the steel strip passes through. There is a risk of damage.
- the apparatuses and methods disclosed in Patent Documents 2 to 6 supply cooling water (draining water) from the side of the hot-rolled steel sheet in the width direction. Spraying.
- Patent Document 2 in order to suppress the scale of the steel plate surface, the purpose is to cover the steel plate surface with water, and the amount of water is small, and the ability to discharge the on-plate water on the steel plate. Low. For this reason, cooling of a thick steel plate becomes non-uniform
- cooling water is jetted from the cooling nozzles provided at four locations in the hot rolled steel sheet width direction toward the center of the four locations. In the vicinity of the collision point of the cooling water from the pair of cooling nozzles facing each other, the ability to discharge the plate water on the hot-rolled steel sheet is low, and the plate water stays in the center. This on-plate water makes the cooling of the hot-rolled steel sheet uneven.
- the draining nozzle injects high-pressure water so as to cross the width direction of the hot-rolled steel material, and the high-pressure water injected from the draining nozzle collides with the hot-rolled steel material.
- the region substantially covers the entire width direction of the hot-rolled steel material. For this reason, the two collision areas from the pair of draining nozzles disposed on both sides of the hot-rolled steel material overlap at both ends of the hot-rolled steel sheet.
- Patent Document 4 does not disclose providing a plurality of pairs of draining nozzles.
- the pressure water sprayed from the spray is directed so as to cross from the center in the width direction of the hot-rolled material to the outer end, and the hot rolling of the pressure water sprayed from the spray is performed.
- the collision region with the material covers at least half of the width of the hot-rolled material. For this reason, two collision areas from a pair of sprays disposed on both sides of the hot rolled material overlap in the center of the hot rolled material. Then, when this spray is used for cooling the hot-rolled material, the central portion of the hot-rolled material where the two collision regions from the pair of sprays overlap is overcooled, resulting in uneven cooling in the width direction.
- Patent Document 5 does not disclose providing a plurality of pairs of sprays.
- the draining nozzle injects draining water in the width direction of the hot-rolled steel sheet.
- the collision area of the drained water sprayed from the plurality of draining nozzles covers the entire width direction of the hot-rolled steel sheet, and the collision area from each draining nozzle is partly in the width direction between the collision areas adjacent to each other in the width direction. It arrange
- the conventional hot-rolled steel sheet cooling method and cooling device have room for improvement.
- the present invention has been made in view of such a point, and an object thereof is to appropriately and uniformly cool a hot-rolled steel sheet after finish rolling in a continuous hot rolling process.
- the present invention is a method for cooling a hot-rolled steel sheet after finish rolling in a continuous hot rolling process, and an area occupied by the hot-rolled steel sheet on a conveying roll is a steel sheet conveying area.
- a pair of spray nozzles are arranged on both sides of the width direction side of the steel plate conveyance region, and a plurality of pairs of the spray nozzles are arranged side by side in the conveyance direction of the hot-rolled steel plate, the spray is applied to the steel plate conveyance region.
- Cooling water is sprayed from the nozzle in the width direction of the steel sheet conveyance area to cool the hot-rolled steel sheet
- the collision area in the steel sheet conveyance area of the cooling water sprayed from the spray nozzle is a steel plate whose distal end in the injection direction is a steel sheet Located at the end of the transfer area, the near end is located inside the steel plate transfer area, and in the spray nozzle pair, the near end of the two collision areas coincides with the width direction to form a meeting part It is characterized by .
- region is the same as the maximum width
- the cooling water sprayed to a portion that is not occupied by the narrow-width hot-rolled steel sheet on the width direction end side of the steel sheet conveyance region is applied to the hot-rolled steel sheet. It does not collide and falls to the lower part of the hot rolled steel plate pass line as it is.
- the meeting portion is formed in the two collision areas of the spray nozzle pair, these collision areas do not overlap in the width direction of the steel sheet conveyance area and cover the entire width direction. Accordingly, it is possible to suppress uneven cooling due to overlapping of the collision areas in the width direction as in the conventional case, and it is possible to cool the hot rolled steel sheet uniformly in the width direction.
- the formation of the meeting portion of the collision area as in the present invention is not disclosed at all in the above-described conventional literature and is novel and extremely useful for uniform cooling of the hot-rolled steel sheet.
- the meeting part is located in a meeting zone defined in the center in the width direction of the steel sheet transport region, the width of the meeting zone satisfies the following formula (1), and the meeting part of the spray nozzle pair adjacent to the transport direction
- the interval in the width direction may be greater than or equal to the length of the collision area in the transport direction.
- W width of the meeting zone
- D width of the steel plate conveyance area
- d horizontal distance between the spray nozzle injection port and the end of the steel plate conveyance area in front of the spray nozzle
- ⁇ 1 spray injection angle
- ⁇ 2 spray installation angle (of the spray nozzle (An angle formed by a line connecting the vertical line of the spray nozzle and the center of the steel sheet conveyance area in the width direction from the spray nozzle spray nozzle)
- the cooling zone in which the cooling water is sprayed from the plurality of pairs of spray nozzles toward the steel plate conveyance region is divided into a plurality of small cooling zones in the conveyance direction, and the cooling small zones include N pairs (N is an integer).
- a pair of spray nozzles is arranged, the meeting zone is divided into the N meeting small zones at equal intervals in the width direction, and one meeting portion is arranged in each of the meeting small zones in the cooling small zone.
- the meeting portion in the cooling small zone is arranged from the upstream side to the downstream side in the transport direction, and is arranged from the meeting small zone at one end of the meeting zone toward the meeting small zone at the other end. It may be.
- the cooling small zones are divided into k (k is a divisor of N) divided cooling small zones in the conveying direction, and the i-th (i is an integer from 1 to k) divided cooling small zones in the conveying direction.
- the meeting part is from i-th to jk + i-th (j is from 1 to (N / k ⁇ 1)) from the first end of the meeting zone to the N-th end of the other end. (Integer).
- the cooling of the hot-rolled steel sheet with the cooling water from the spray nozzle may be performed in the nucleate boiling region.
- the present invention according to another aspect is an apparatus for cooling a hot-rolled steel sheet after finish rolling in a continuous hot rolling process, wherein the area occupied by the hot-rolled steel sheet on a transport roll is a steel sheet transport area.
- Spray nozzles for injecting cooling water in the width direction of the steel sheet transport area with respect to the transport area are disposed in pairs on both sides in the width direction of the steel sheet transport area, and the spray nozzle pair transports the hot-rolled steel sheet.
- a plurality of pairs of spray nozzles are arranged side by side in the direction, and the spray nozzle has a far end in the injection direction in the collision area in the steel sheet transport area of the cooling water sprayed from the spray nozzle.
- the spray nozzle pair is arranged so that the near ends of the two collision areas coincide with each other in the width direction to form a meeting part.
- the meeting part is located in a meeting zone defined in the center in the width direction of the steel sheet transport region, the width of the meeting zone satisfies the following formula (1), and the spray nozzle pairs adjacent in the transport direction are respectively
- the interval in the width direction of the meeting portion may be arranged to be equal to or longer than the length of the collision area in the transport direction.
- W width of the meeting zone
- D width of the steel plate conveyance area
- d horizontal distance between the spray nozzle injection port and the end of the steel plate conveyance area in front of the spray nozzle
- ⁇ 1 spray injection angle
- ⁇ 2 spray installation angle (of the spray nozzle (An angle formed by a line connecting the vertical line of the spray nozzle and the center of the steel sheet conveyance area in the width direction from the spray nozzle spray nozzle)
- the cooling zone in which the cooling water is sprayed from the plurality of pairs of spray nozzles toward the steel plate conveyance region is divided into a plurality of small cooling zones in the conveyance direction, and the cooling small zones include N pairs (N is an integer).
- a pair of spray nozzles is arranged, the meeting zone is divided into the N meeting small zones at equal intervals in the width direction, and one meeting portion is arranged in each of the meeting small zones in the cooling small zone.
- the meeting portion in the cooling small zone is arranged from the upstream side to the downstream side in the transport direction, and is arranged from the meeting small zone at one end of the meeting zone toward the meeting small zone at the other end. It may be.
- the cooling small zones are divided into k (k is a divisor of N) divided cooling small zones in the conveying direction, and the i-th (i is an integer from 1 to k) divided cooling small zones in the conveying direction.
- the meeting part is from i-th to jk + i-th (j is from 1 to (N / k ⁇ 1)) from the first end of the meeting zone to the N-th end of the other end. (Integer).
- the hot-rolled steel sheet after finish rolling in the continuous hot rolling process can be appropriately and uniformly cooled.
- Example 2 It is explanatory drawing of an Example, (a) shows the case where the meeting part is formed in the collision area
- FIG. 1 is an explanatory diagram showing an outline of a configuration of a hot rolling facility 1 provided with a cooling device in the present embodiment.
- the heated slab 5 is continuously rolled between rolls up and down, and is thinned to a minimum thickness of 1 mm to obtain a hot-rolled steel sheet 10a (hereinafter referred to as reference numerals in the drawings as will be described later).
- 10 shall mean either the steel plate conveyance area
- the continuous hot rolling facility 1 has a heating furnace 11 for heating the slab 5, a width direction rolling machine 12 for rolling the slab 5 heated in the heating furnace 11 in the width direction, and the width in the width direction.
- a rough rolling machine 13 that rolls the slab 5 from the upper and lower directions to form a rough bar
- a finish rolling machine 14 that continuously performs hot finish rolling of the rough bar to a predetermined thickness
- the finish rolling machine 14 A cooling device 15 that cools the hot-rolled steel plate 10a that has been finish-rolled with cooling water, and a winding device 16 that winds the hot-rolled steel plate 10a cooled by the cooling device 15 into a coil shape are provided.
- the above is a general configuration and is not limited to this.
- the heating furnace 11 a process for heating the slab 5 carried in from the outside through the loading port to a predetermined temperature is performed.
- the slab 5 is transferred to the outside of the heating furnace 11, and the process proceeds to a rolling process by the roughing mill 13.
- the slab 5 that has been transported is rolled into a rough bar having a thickness of about 30 to 60 mm by the roughing mill 13 and transported to the finishing mill 14.
- the finishing mill 14 rolls the conveyed coarse bar to a hot-rolled steel sheet 10a having a thickness of about several millimeters.
- the rolled hot-rolled steel sheet 10 a is transported by the transport roll 17 and sent to the cooling device 15.
- the hot-rolled steel sheet 10 a is cooled by the cooling device 15 and wound up in a coil shape by the winding device 16.
- FIG. 2 schematically shows a side surface of the cooling device 15, and FIG. 3 schematically shows a plane of the cooling device 15.
- the upper side cooling device 20 arrange
- the upper cooling device 20 has a plurality of cooling water nozzles 21 for injecting cooling water vertically downward from above the hot rolled steel sheet 10a toward the upper surface of the hot rolled steel sheet 10a.
- the cooling water nozzle 21 for example, a slit laminar nozzle or a pipe laminar nozzle is used.
- a plurality of cooling water nozzles 21 are arranged side by side along the conveying direction of the hot-rolled steel sheet 10a (the direction of the thick arrow in the figure).
- the cooling water nozzle 21 is not limited to these nozzles, and other nozzles may be used.
- a draining device 30 is provided for draining the on-board water 22 in which the cooling water sprayed from the upper cooling device 20 flows along with the steel plate.
- the drainer 30 of this embodiment uses a plurality of drainer spray devices 31, and the drainer fluid from each sprayer 31 toward the upstream in the transport direction, for example, Water is jetted.
- a side spray device 40 is provided on the downstream side in the transport direction of the drainer 30.
- a plurality of spray nozzles 41 are installed along the transport direction on both sides in the width direction of the steel plate transport region 10 (the region where the hot-rolled steel plate 10a is transported on the pass line).
- FIG. 3 shows a total of 10 spray nozzles 41, 5 on each side, but of course this is not limiting and the number of installations can be selected as appropriate.
- the steel plate conveyance area 10 is an area occupied by the hot-rolled steel sheet 10 a on the conveyance roll 17. That is, the steel plate conveyance region 10 is a line that connects the vertices of the conveyance roll 17 in a side view, and the conveyance region when the dimension in the width direction of the hot-rolled steel plate 10a is the maximum manufacturable size (maximum width) in a plan view. It is. Below, it demonstrates as what the width
- region 10 is the maximum width of the hot-rolled steel plate 10a as mentioned above, in the side spray apparatus 40, when cooling the hot-rolled steel plate 10a of a width narrower than a maximum width, the steel plate used as the difference The cooling water sprayed to the width direction end part side of the conveyance area 10 does not collide with the hot-rolled steel sheet 10a and falls as it is below the pass line of the hot-rolled steel sheet 10a.
- a drainer 50 is provided downstream of the side spray device 40 in the transport direction.
- a draining fluid for example, water is ejected from each spray device 51 toward the upstream in the transport direction. Yes.
- a temperature sensor MT for measuring the temperature of the hot-rolled steel sheet 10a is disposed between the draining device 30 and the side spray device 40, and between the draining device 50 and the winding device 16, heat is applied.
- a temperature sensor CT for measuring the temperature of the rolled steel sheet 10a is disposed.
- the temperature signal from the temperature sensor MT is used, for example, for controlling the upper cooling device 20 (for example, feedback control), and the temperature signal from the temperature sensor CT is used for controlling, for example, the side spray device 40 (for example, feedback control). .
- the cooling device 15 has the above-described configuration, and the hot-rolled steel plate 10a rolled to a predetermined thickness by the finish rolling mill 14 is first supplied from the cooling water nozzle 21 of the upper cooling device 20. It is cooled by the cooling water (illustration of the lower cooling device is omitted as described above). Then, draining is performed by the draining device 30. Next, the drained hot-rolled steel sheet 10 a is further cooled by the side spray device 40.
- the hot-rolled steel sheet 10a is cooled to about 200 ° C. in the cooling device 15.
- the hot-rolled steel sheet 10a can be appropriately and uniformly cooled to about 200 ° C. and wound up, for example, in the hot-rolled steel sheet 10a adjusted to a predetermined component, the tempered martensite during the cooling after winding.
- the hot-rolled steel sheet 10a with improved deformability can be advantageously manufactured.
- by setting the coiling temperature below the martensitic transformation start temperature (Ms point) and exceeding the boiling point of water there is an effect that the formation of red scale on the hot-rolled steel sheet 10a can be suppressed.
- ⁇ Side spray device> Next, the detail of the side spray apparatus 40 mentioned above is demonstrated.
- a pair of spray nozzles 41, 41 are arranged on the side in the width direction of the steel plate conveyance region 10. Further, a plurality of pairs of spray nozzles 42 constituted by the pair of spray nozzles 41, 41 are arranged side by side in the conveying direction of the hot-rolled steel sheet 10a. As described above, the number of spray nozzles 41 and spray nozzle pairs 42 can be appropriately selected as necessary.
- the spray nozzle 41 injects cooling water obliquely from above with respect to the steel plate transport region 10 and in the width direction of the steel plate transport region 10.
- the collision region 43 in the steel plate transport region 10 of the cooling water sprayed from the spray nozzle 41 is a steel plate transport at the far end 43 a (the end opposite to the spray nozzle 41) in the spray direction.
- the near end 43 b (the end on the spray nozzle 41 side) is located inside the steel plate conveyance area 10.
- the near end portions 43b and 43b of the two collision areas 43 and 43 coincide with the width direction to form a meeting portion P (thick line portion in FIG. 4).
- the fact that the near end portions 43b and 43b of the two collision areas 43 and 43 coincide with each other in the width direction means that the collision area 43 on one width side of the steel sheet conveyance area 10 is aligned as shown in FIGS.
- the near end portion 43b and the near end portion 43b of the other width side collision region 43 coincide with each other without overlapping or separating at the meeting portion P in the visual field of FIG. It means that the collision area 43 in the width direction appears as one collision area continuous from one end to the other end of the steel plate conveyance area 10.
- the spray nozzle 41 is arranged so as to be sprayed obliquely from above with a predetermined spray angle with respect to the steel sheet transport region 10, so that the on-board water 22 remains on the upper surface of the hot-rolled steel sheet 10a. Even if it does, it can cool the hot-rolled steel sheet 10a, discharging this to the edge part side (distant end part side) of the hot-rolled steel sheet 10a.
- these collision areas 43 and 43 do not overlap with the width direction of the steel plate conveyance area 10, and also cover the entire width direction. . Therefore, it is possible to suppress uneven cooling due to overlapping of the collision regions in the width direction as in the conventional case, and it is possible to uniformly cool the hot rolled steel sheet 10a in the width direction.
- the meeting portion P is a portion where the near end portions 43b and 43b of the two collision regions 43 and 43 are in contact with each other, and in contrast to the central portion in the single collision region 43, the near end is industrially used. Because the position of the portion 43b must be allowed to vary to some extent, the meeting portion P industrially includes an unstable element in the cooling effect. For this reason, as an extreme case, assuming that the meeting parts P of all the spray nozzle pairs 42 are aligned at the center in the width direction of the steel sheet conveyance region 10, the in-plate variation of the cooling stop temperature is expected to increase. . On the other hand, as a result of intensive studies by the present inventors, it has been found that it is preferable to disperse the meeting portions P of all the spray nozzle pairs 42 within a predetermined width.
- the meeting part P is positioned in the meeting zone E defined in the center in the width direction of the steel sheet transport region 10.
- the width W of the meeting zone E satisfies the following formula (1).
- ⁇ 2 Spray installation angle (angle formed by a line connecting the vertical line of the spray nozzle 41 a of the spray nozzle 41 and the center in the width direction of the steel sheet conveyance region 10 from the spray nozzle 41 a of the spray nozzle 41)
- the present inventors paid attention to the reach distance of the cooling water sprayed from the spray nozzle 41 to the steel plate transport area 10.
- the distance from the spray port 41a of the spray nozzle 41 to the far end 43a of the collision region 43 is Lf
- the distance from the spray port 41a of the spray nozzle 41 to the near end 43b of the collision region 43 is as follows. Let the near distance be Ln.
- FIG. 6 illustrates the case where the meeting part P is located at the end of the meeting zone E.
- the width W of the meeting zone E is derived so as to satisfy Lf / Ln ⁇ 2.
- Lf / Ln ⁇ 2 the basis of Lf / Ln ⁇ 2 will be described.
- the present inventors performed a simulation of cooling of the hot-rolled steel sheet 10a using the side spray device 40, and found the tendency shown in FIG. FIG. 7 shows the temperature difference ⁇ T1 (vertical axis) in the width direction of the upper surface of the hot-rolled steel sheet 10a when Lf / Ln (horizontal axis) is changed.
- the width direction temperature difference ⁇ T1 is the difference between the maximum temperature and the minimum temperature in the width direction of the hot-rolled steel sheet 10a after the hot-rolled steel sheet 10a is cooled and reheated (for example, immediately before being wound by the winding device 16). is there.
- the width direction temperature difference ⁇ T1 of the hot-rolled steel sheet 10a increases. This is because when Lf / Ln increases, the difference in force when the cooling water collides with the far end 43a and the near end 43b increases, and the difference in cooling capacity between the two increases.
- Lf / Ln ⁇ 2 the cooling water after colliding with the near side flows to the far side, whereby cooling on the far side is performed, so the temperature difference in the width direction of the hot-rolled steel sheet 10a.
- ⁇ T1 is small, and the variation in cooling capacity in the width direction of the hot-rolled steel sheet 10a is small. Therefore, Lf / Ln ⁇ 2 is suitable for uniformly cooling the hot-rolled steel sheet 10a in the width direction.
- the width D of the steel plate conveyance region 10 is 2000 mm
- the horizontal distance d between the spray nozzle 41 and the end of the steel plate conveyance region 10 is 250 mm
- the spray injection angle ⁇ 1 is 20 °
- the spray installation angle ⁇ When 2 is 60 °
- the width D of the steel plate conveyance region 10 is 2000 mm
- the horizontal distance d between the spray nozzle 41 and the end of the steel plate conveyance region 10 is 250 mm
- the spray injection angle ⁇ 1 is 20 °
- the spray installation angle ⁇ When 2 is 45 °
- the installation height h of the spray nozzle 41 (height h from the steel plate conveyance area 10 to the spray nozzle 41a of the spray nozzle 41) is realistically about 400 to 600 mm.
- the installation height is higher than 600 mm, the cooling capacity at the far end 43a is lowered.
- the installation height is lower than 400 mm, it is necessary to reduce the spray injection angle ⁇ 1 in order to secure the collision area 43, but in this case, it becomes difficult to produce the spray nozzle 41.
- the meeting portion P is a portion where the near end portions 43b and 43b of the two collision regions 43 and 43 are in contact with each other, and industrially includes an unstable element in the cooling effect.
- the meeting portions P, P of the spray nozzle pairs 42, 42 adjacent in the transport direction are preferably separated by a predetermined distance or more.
- the interval Q in the width direction of the meeting portions P and P of the spray nozzle pairs 42 and 42 adjacent to each other in the transport direction is equal to or longer than the length R of the collision region 43 in the transport direction.
- FIG. 8 shows the relationship between the separation distance (horizontal axis) in the steel plate width direction from the meeting part P and the upper surface temperature difference ⁇ T2 (vertical axis) of the hot-rolled steel sheet 10a.
- an industrial unstable factor affects the separation distance from the meeting part P in the range of the length R in the transport direction of the collision region 43 as will be described later (the upper surface temperature difference ⁇ T2 increases).
- the length R is used as a reference, and a multiple n (n is an integer) with respect to the length R is shown as the separation distance from the meeting part P.
- the upper surface temperature difference ⁇ T2 of the hot-rolled steel sheet 10a is equal to the upper surface temperature of the hot-rolled steel sheet 10a in the meeting part P and the hot-rolled steel sheet 10a at a measurement point separated from the meeting part P by a separation distance (a multiple n of the length R). It is a difference with the upper surface temperature.
- n is smaller than 1, that is, when the measurement point is close to the meeting part P, the upper surface temperature difference ⁇ T2 becomes large.
- n is 1 or more, that is, when the measurement point is away from the meeting portion P, the upper surface temperature difference ⁇ T2 is small and almost zero.
- n is smaller than 1, that is, the interval Q is greater than the length R of the collision region 43 in the conveyance direction.
- a large upper surface temperature difference ⁇ T2 with respect to one meeting portion P and a large upper surface temperature difference ⁇ T2 with respect to another meeting portion P are overlapped in the transport direction. If it does so, the hot-rolled steel plate 10a cannot be cooled uniformly in the width direction.
- the interval Q in the width direction of the meeting part P is preferably equal to or longer than the length R of the collision area 43 in the transport direction.
- the width D of the steel plate conveyance region 10 is 2000 mm
- the horizontal distance d between the spray nozzle 41 and the end of the steel plate conveyance region 10 is 250 mm
- the meeting zone E is divided into N meeting small zones e (meeting small zones e1 to e8) at equal intervals in the width direction, in this embodiment.
- N is an integer of 2 or more, and can be arbitrarily selected.
- the cooling zone F when a region in which cooling water is sprayed from all the spray nozzle pairs 42 toward the steel plate conveyance region 10 is a cooling zone F, the cooling zone F includes a plurality of cooling small zones in the conveyance direction. divided into f. In each cooling small zone f, the same number N of spray nozzle pairs 42 as the meeting small zone e are arranged. For convenience of illustration, the small cooling zones f1 to f3 are shown in FIG. 9, but the number of small cooling zones f is not limited to this, and the number can be appropriately selected as necessary. It is determined according to the number of spray nozzle pairs 42 in the apparatus 40. For example, when there are M ⁇ N pairs of spray nozzle pairs 42 (M is an integer of 2 or more), M cooling small zones f are provided.
- one meeting portion P is arranged in one meeting small zone e. Further, in one cooling small zone f, the meeting portion P is directed from the upstream side to the downstream side in the transport direction, and the meeting small zone e1 at one end of the meeting zone E is changed to the meeting small zone e8 at the other end. It is arranged toward.
- the meeting portions P and P of the pair of spray nozzles 42 and 42 adjacent to each other in the transport direction are arranged in the same meeting small zone e, the meeting portions P and P may be supercooled.
- the meeting parts P since the meeting parts P are arranged in a staggered manner in one cooling small zone f, the meeting parts P can be dispersed in the width direction, and the portion that is supercooled is minimized. Can be Therefore, it can cool uniformly in the width direction of the hot-rolled steel sheet 10a.
- one cooling small zone f1 (f2, f3) is further divided into k pieces in the transport direction, and in this embodiment, two divided cooling small zones f11, f12 (f21, f22, f31, f32).
- k is a divisor of N and can be arbitrarily selected.
- the meeting part P is arranged in the meeting small zones e1, e3, e5, e7.
- the meeting portion P is disposed and the meeting small zones e2, e4, e6, and e8 are disposed.
- the small cooling zone f1 is thus divided into two in the transport direction, one meeting portion P is arranged for every two small meeting zones e in the width direction in the cooling small zone f1.
- the meeting part P is similarly arrange
- the meeting part P is 1 on the one end side of the meeting zone E. From i-th to N-th on the other end side, i-th to jk + i-th (j is an integer from 1 to (N / k-1)).
- the number k into which one cooling small zone f is divided is not limited to two, and may be a divisor of N. In the example described above, since N is 8, the number k into which the cooling small zone f is divided may be four.
- the same effect as the arrangement of the meeting parts P shown in FIG. 4 can be enjoyed, that is, the meeting parts P are dispersed in the width direction to be supercooled. Can be minimized.
- the meeting portions P can be further dispersed in the width direction. Therefore, it can cool uniformly by the width direction of the hot-rolled steel sheet 10a.
- the arrangement of the meeting parts P is not limited to a staggered pattern, and any arrangement that disperses the meeting parts P in the width direction may be used.
- the boiling state of the cooling water on the hot-rolled steel sheet 10a varies depending on the upper surface temperature of the hot-rolled steel sheet 10a. Specifically, the film boiling region, the transition boiling region, and the nucleate boiling region change in order from the high temperature side of the upper surface temperature.
- the hot-rolled steel plate 10a In the transition boiling region, when the cooling water is sprayed on the upper surface of the hot-rolled steel sheet 10a, a place where the steam film and the cooling water come into contact with each other on the upper surface of the hot-rolled steel sheet 10a. In this transition boiling region, the heat transfer coefficient increases as the upper surface temperature of the hot-rolled steel sheet 10a decreases. For this reason, it is difficult to cool the portion where the upper surface temperature of the hot-rolled steel plate 10a is high, and the portion where the upper surface temperature is low is rapidly cooled, and local variation occurs in the upper surface temperature of the hot-rolled steel plate 10a. If it does so, the hot-rolled steel plate 10a cannot be cooled uniformly.
- the hot-rolled steel sheet 10a since the hot-rolled steel sheet 10a is cooled in the nucleate boiling region in the side spray device 40, the hot-rolled steel sheet 10a can be uniformly cooled with a high cooling capacity. In other words, the temperature of the hot-rolled steel sheet 10a can be finely controlled in the side spray device 40 and can be cooled to about 200 ° C., which is the target temperature.
- the side spray device 40 aims to cool to a low temperature of about 200 ° C., and in order to realize this, one spray nozzle 41 has a large water density, for example, 4 m 3 /
- the hot-rolled steel sheet 10a is cooled by injecting cooling water having a water density of m 2 / min.
- the nucleate boiling cooling is a cooling in which the upper surface temperature of the hot-rolled steel sheet 10 a is 400 ° C. or less.
- the near end 43b of the collision region 43 is the steel plate conveyance region.
- the area of the collision area 43 is 0.0325 m 2 .
- the hot-rolled steel sheet 10a is cooled to a low temperature of about 200 ° C.
- the cooling stop temperature in the cooling device 15 is not low, from all the spray nozzles 41 of the side spray device 40.
- control is performed for each pair of spray nozzles 42 having the same meeting portion P, and cooling water is injected only from the pair of spray nozzles 42 necessary for cooling, which is unnecessary for cooling.
- the cooling capability of the side spray device 40 is adjusted by preventing the cooling water from being sprayed from the spray nozzle pair 42.
- the side spray device 40 is preferably provided with a valve that controls whether or not the cooling water is supplied for each of the plurality of spray nozzle pairs 42.
- the region where the valve is provided can be set as the cooling small zone f described above. Even in such a case, it is preferable to satisfy the conditions of the above embodiment for each cooling small zone f. That is, in the cooling small zone f in which the valve is provided, as shown in FIG. 4, the meeting part P of the collision regions 43 and 43 in the spray nozzle pair 42 is formed, and the meeting part P further satisfies the above formula (1).
- the interval Q in the width direction of the meeting portions P, P of the spray nozzle pairs 42, 42 adjacent to each other in the conveying direction, which is disposed in the meeting zone E having a sufficient width, is equal to or longer than the length R of the collision region 43 in the conveying direction. It becomes. Further, in the cooling small zone f, as shown in FIGS. 9 and 10, the meeting portions P are arranged in a staggered manner.
- the dedicated draining device 30 is used for draining the on-board water 22 after cooling by the upper cooling device 20, but as shown in FIG.
- the draining device 30 may be abolished and the spray nozzle pair 42 of the side spray device 40 may be installed. That is, in addition to the spray nozzle pair 42 used for cooling the original hot-rolled steel sheet 10a, the spray nozzle pair 42 may be installed for draining on the upstream side in the transport direction.
- FIG. 11 it is configured as a facility in which a plurality of spray nozzle pairs 42 are installed on both downstream sides of the upper cooling device 20, but the width and thickness of the hot-rolled steel sheet 10a to be cooled, the conveyance speed
- a dedicated draining device 30 can be controlled by switching the spray nozzle pair 42 used for draining and the spray nozzle pair 42 used for cooling, or by controlling the number of sprays as required. It is not necessary to install the equipment, and it is possible to make the equipment excellent in versatility.
- the dedicated draining device 50 may be eliminated and the spray nozzle pair 42 of the side spray device 40 may be installed.
- the conditions common to the example and the comparative example in this verification are as follows.
- the thickness of the hot-rolled steel sheet 10a to be cooled is 2.5 mm, and the width of the hot-rolled steel sheet 10a is 1500 mm.
- the width D of the steel plate conveyance area 10 is 2000 mm.
- the side spray device 40 has 84 spray nozzles 41, that is, 42 spray nozzle pairs 42.
- the installation height h of each spray nozzle 41 is 600 mm. Using a flat spray nozzle for each spray nozzle 41, the spraying angle theta 1 is 12 degrees, the spray installation angle theta 2 is 62 degrees.
- the injection pressure of the cooling water injected from each spray nozzle 41 is 0.5 MPa
- the cooling water volume density is 4.2 m 3 / m 2 / min
- the cooling water volume is 360 L / min
- the direction of conveyance of the collision area 43 is The length R is 69 mm.
- the meeting portion P is formed in the collision regions 43 and 43 of the spray nozzle pair 42.
- regions 43 and 43 of the spray nozzle pair 42 overlap, and the space
- regions 43 and 43 of the spray nozzle pair 42 do not overlap, and the space
- the meeting parts P formed at 42 locations in the transport direction are dispersed in the width direction, and the meeting parts P and P adjacent to each other in the transport direction are arranged.
- the interval Q in the width direction is equal to or longer than the length R of the collision area 43 in the transport direction.
- the spray nozzle pair 42 the horizontal distance d1 between the spray port 41a of one spray nozzle 41 and the end of the steel plate transport region 10, the spray port 41a of the other spray nozzle 41 and the steel plate transport region 10
- the overlapping portion of the collision areas 43 and 43 of the spray nozzle pair 42 is arranged in the width direction so that the center point C1 in the width direction is at the same position corresponding to the meeting portion P in the first embodiment. It is formed in a dispersed manner.
- the width direction center point C2 of the portions where the collision regions 43, 43 of the spray nozzle pair 42 do not overlap are at the same position corresponding to the meeting portion P in the first embodiment. Dispersed in the width direction.
- the cooling start temperature of the hot-rolled steel sheet 10a in the side spray device 40 is 600 ° C.
- the target temperature after cooling of the hot-rolled steel sheet 10a winding temperature of the hot-rolled steel sheet 10a in the winding device 16.
- the simulation was performed at 300 ° C.
- Example 1, Comparative Example 1, and Comparative Example 2 the winding temperature of the hot-rolled steel sheet 10a in the winding device 16 is measured, and its width direction deviation (maximum temperature and minimum in the width direction of the hot-rolled steel sheet 10a) is measured. Temperature difference).
- Example 1 the temperature in the width direction of the hot-rolled steel sheet 10a was 300 ° C. ⁇ 5 ° C., and the temperature deviation was 10 ° C.
- Comparative Example 1 the temperature in the width direction of the hot-rolled steel sheet 10a was 300 ° C. ⁇ 30 ° C., and the temperature deviation was 60 ° C.
- Comparative Example 2 the temperature in the width direction of the hot-rolled steel sheet 10a was 300 ° C. ⁇ 25 ° C., and the temperature deviation was 50 ° C.
- the hot-rolled steel sheet 10a after cooling is formed. It was found that the temperature deviation in the width direction can be reduced and the hot-rolled steel sheet 10a can be cooled uniformly in the width direction.
- the width and width of the meeting zone E where the meeting part P is located satisfy the above formula (1), that is, satisfy the above-described Lf / Ln ⁇ 2 (FIG. 7). This will be described using an example. Also in this verification, a simulation was performed using the side spray device 40 shown in FIGS.
- the conditions common to the examples and comparative examples in this verification are as follows.
- the thickness of the hot-rolled steel sheet 10a to be cooled is 2.5 mm, and the width of the hot-rolled steel sheet 10a is 1500 mm.
- the width D of the steel plate conveyance area 10 is 2000 mm.
- the side spray device 40 has 84 spray nozzles 41, that is, 42 spray nozzle pairs 42.
- the installation height h of each spray nozzle 41 is 600 mm.
- a flat spray nozzle was used for each spray nozzle 41.
- Example 2 Example 3, and Comparative Example 3 of this verification, the meeting part P is formed in the collision regions 43 and 43 of the spray nozzle pair 42, respectively. Then, by changing the spraying angle theta 1 and spray installation angle theta 2 of the spray nozzles 41, was varied Lf / Ln. Specifically, Lf / Ln of Example 2 of the present invention was 1.9, Lf / Ln of Example 3 of the present invention was 2.0, and Lf / Ln of Comparative Example 3 was 2.5.
- Example 2 the spray injection angle ⁇ 1 of each spray nozzle 41 was 14 degrees, the spray installation angle ⁇ 2 was 61 degrees, and Lf / Ln was 1.9. Moreover, in Example 2, the injection pressure of the cooling water injected from each spray nozzle 41 is 0.5 MPa, the amount density of the cooling water is 4.2 m 3 / m 2 / min, the amount of the cooling water is 308 L / min, The length R of the collision area 43 in the transport direction is 62 mm.
- Example 3 the spray injection angle ⁇ 1 of each spray nozzle 41 was 16 degrees, the spray installation angle ⁇ 2 was 59 degrees, and Lf / Ln was 2.0. Moreover, in Example 2, the injection pressure of the cooling water injected from each spray nozzle 41 is 0.5 MPa, the amount density of the cooling water is 4.2 m 3 / m 2 / min, the amount of the cooling water is 320 L / min, The length R of the collision area 43 in the transport direction is 61 mm.
- the spray injection angle ⁇ 1 of each spray nozzle 41 was 25 degrees
- the spray installation angle ⁇ 2 was 50 degrees
- Lf / Ln was 2.5
- the injection pressure of the cooling water injected from each spray nozzle 41 is 0.5 MPa
- the amount density of the cooling water is 4.2 m 3 / m 2 / min
- the amount of the cooling water is 367 L / min
- the length R of the collision area 43 in the transport direction is 58 mm.
- Example 2 Example 3, and Comparative Example 3, in each meeting zone E, the meeting parts P formed at 42 locations in the transport direction are dispersed in the width direction and are arranged adjacent to each other in the transport direction.
- the interval Q in the width direction of P and P is set to 70 mm that is equal to or longer than the length R of the collision region 43 in the transport direction.
- the spray nozzle pair 42 the horizontal distance d1 between the spray port 41a of one spray nozzle 41 and the end of the steel plate transport region 10, the spray port 41a of the other spray nozzle 41 and the steel plate transport region.
- the cooling start temperature of the hot-rolled steel sheet 10a in the side spray device 40 is 600 ° C.
- the target temperature after cooling of the hot-rolled steel sheet 10a winding temperature of the hot-rolled steel sheet 10a in the winding device 16.
- the simulation was performed at 300 ° C.
- Example 2, Example 3, and Comparative Example 3 the winding temperature of the hot-rolled steel sheet 10a in the winding device 16 is measured, and its width direction deviation (maximum temperature and minimum in the width direction of the hot-rolled steel sheet 10a) is measured. Temperature difference).
- Example 2 and Example 3 the temperature in the width direction of the hot-rolled steel sheet 10a was 300 ° C. ⁇ 5 ° C., and the temperature deviation was 10 ° C.
- Comparative Example 3 the temperature in the width direction of the hot-rolled steel sheet 10a was 300 ° C. ⁇ 25 ° C., and the temperature deviation was 50 ° C.
- the temperature deviation in the width direction of the hot-rolled steel sheet 10a after cooling is smaller than in the case of Comparative Example 3 (Lf / Ln> 2). It was found that the hot-rolled steel sheet 10a can be uniformly cooled in the width direction.
- the above formula (1) relating to the width W of the meeting zone E is derived from Lf / Ln ⁇ 2, and when the meeting portions P are dispersed in the meeting zone E, the hot-rolled steel sheet 10a is uniformly distributed in the width direction. It turns out that it can cool.
- the interval Q in the width direction of the pair of spray nozzles 42 adjacent to each other in the transport direction is equal to or greater than the length R in the transport direction of the collision region 43, that is, the meeting portion P and the surrounding area.
- the influence range (FIG. 8) on which the temperature difference affects the surroundings will be described using examples and comparative examples. Also in this verification, a simulation was performed using the side spray device 40 shown in FIGS.
- the conditions common to the example and the comparative example in this verification are as follows.
- the thickness of the hot-rolled steel sheet 10a to be cooled is 2.5 mm, and the width of the hot-rolled steel sheet 10a is 1500 mm.
- the width D of the steel plate conveyance area 10 is 2000 mm.
- the side spray device 40 has 84 spray nozzles 41, that is, 42 spray nozzle pairs 42.
- the installation height h of each spray nozzle 41 is 600 mm. Using a flat spray nozzle for each spray nozzle 41, the spraying angle theta 1 is 12 degrees, the spray installation angle theta 2 is 62 degrees.
- the injection pressure of the cooling water injected from each spray nozzle 41 is 0.5 MPa
- the cooling water volume density is 4.2 m 3 / m 2 / min
- the cooling water volume is 360 L / min
- the direction of conveyance of the collision area 43 is The length R is 69 mm.
- Example 4 and Comparative Example 4 of this verification the meeting part P is formed in the collision regions 43 and 43 of the spray nozzle pair 42, respectively. And the space
- Example 4 and Comparative Example 4 in the meeting zone E, the meeting parts P formed at 42 places in the transport direction are arranged in the width direction so as to be dispersed.
- the spray nozzle pair 42 in the spray nozzle pair 42, the horizontal distance d1 between the spray port 41a of one spray nozzle 41 and the end of the steel sheet transport region 10 and the spray ports 41a of the other spray nozzles 41 are used.
- the cooling start temperature of the hot-rolled steel sheet 10a in the side spray device 40 is 600 ° C.
- the target temperature after cooling of the hot-rolled steel sheet 10a (winding temperature of the hot-rolled steel sheet 10a in the winding device 16).
- the simulation was performed at 300 ° C.
- the winding temperature of the hot-rolled steel sheet 10a in the winding device 16 is measured, and its width direction deviation (difference between the maximum temperature and the minimum temperature in the width direction of the hot-rolled steel sheet 10a). was measured.
- Example 4 the temperature in the width direction of the hot-rolled steel sheet 10a was 300 ° C. ⁇ 5 ° C., and the temperature deviation was 10 ° C.
- Comparative Example 4 the temperature in the width direction of the hot-rolled steel sheet 10a was 300 ° C. ⁇ 20 ° C., and the temperature deviation was 40 ° C.
- Example 4 of the present invention when the interval Q in the width direction of the meeting portions P, P is larger than the length R in the conveyance direction of the collision region 43), in the case of Comparative Example 3 (the interval Q is the length R). It was found that the temperature deviation in the width direction of the hot-rolled steel sheet 10a after cooling can be made smaller than that in the case where it is smaller, and the hot-rolled steel sheet 10a can be cooled uniformly in the width direction.
- the present invention is useful when cooling a hot-rolled steel sheet after finish rolling in a continuous hot rolling process.
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Abstract
Description
W≦(D+2d)-(D+d)sinθ2/sin(θ1+θ2) ・・・(1)
但し、
W:会合ゾーンの幅
D:鋼板搬送領域の幅
d:スプレーノズルの噴射口とその手前の鋼板搬送領域の端部との水平距離
θ1:スプレー噴射角
θ2:スプレー設置角(スプレーノズルの噴射口の垂線とスプレーノズルの噴射口から鋼板搬送領域の幅方向中心を結ぶ線の成す角)
W≦(D+2d)-(D+d)sinθ2/sin(θ1+θ2) ・・・(1)
但し、
W:会合ゾーンの幅
D:鋼板搬送領域の幅
d:スプレーノズルの噴射口とその手前の鋼板搬送領域の端部との水平距離
θ1:スプレー噴射角
θ2:スプレー設置角(スプレーノズルの噴射口の垂線とスプレーノズルの噴射口から鋼板搬送領域の幅方向中心を結ぶ線の成す角)
以下、本発明の実施の形態について説明する。図1は、本実施の形態における冷却装置を備えた熱間圧延設備1の構成の概略を示す説明図である。
次に、本実施の形態にかかる冷却装置15の詳細について説明する。図2は、冷却装置15の側面を模式的に示し、図3は冷却装置15の平面を模式的に示している。図2に示すように、ランアウトテーブルの搬送ロール17上を搬送される熱延鋼板10aの上方に配置された上側冷却装置20と、当該熱延鋼板10aの下方に配置された下側冷却装置(図示せず)とを有している。
次に、上述したサイドスプレー装置40の詳細について説明する。サイドスプレー装置40では、図4に示すように、鋼板搬送領域10の幅方向側方に一対のスプレーノズル41、41が配置されている。また、これら一対のスプレーノズル41、41で構成されるスプレーノズル対42が熱延鋼板10aの搬送方向に並べて複数対配置されている。なお、上述したようにスプレーノズル41、スプレーノズル対42の設置数は必要に応じて適宜選択できる。
前記会合部Pは、2つの衝突領域43、43の近方端部43b、43b同士が接する部分であり、単一の衝突領域43における中央部と対比して、工業的には、近方端部43bの位置がある程度変動することを許容せざるを得ないことなどから、会合部Pは工業的には冷却効果に不安定要素を含む。このため、極端な場合として、全てのスプレーノズル対42の会合部Pが鋼板搬送領域10の幅方向中央部で揃う場合を想定すると、冷却停止温度の板内バラツキが大きくなることが予想される。これに対し、本発明者らが鋭意検討した結果、全てのスプレーノズル対42の会合部Pを所定の幅内で分散させることが好ましいことが分かった。
W≦(D+2d)-(D+d)sinθ2/sin(θ1+θ2) ・・・(1)
但し、
W:会合ゾーンEの鋼板搬送領域10の幅方向の幅
D:鋼板搬送領域10の幅
d:スプレーノズル41の噴射口41aとその手前の鋼板搬送領域10の端部との水平距離
θ1:スプレー噴射角(スプレーノズル41から噴射される冷却水の鉛直方向の噴射角)
θ2:スプレー設置角(スプレーノズル41の噴射口41aの垂線とスプレーノズル41の噴射口41aから鋼板搬送領域10の幅方向中心を結ぶ線の成す角)
Lf=(D+d)/cos{90°-(θ1+θ2)} ・・・(2)
Ln=(D/2+d-W/2)/cos(90°-θ2) ・・・(3)
W≦(D+2d)-(D+d)sinθ2/sin(θ1+θ2) ・・・(1)
上述したように会合部Pは、2つの衝突領域43、43の近方端部43b、43b同士が接する部分であり、工業的には冷却効果に不安定要素を含むことから、本発明者らが鋭意検討した結果、搬送方向に隣接するスプレーノズル対42、42の会合部P、Pは所定距離以上に離すことが好ましいことが分かった。
図9に示すように会合ゾーンEにおいて、会合部Pは千鳥状に配置される。
サイドスプレー装置40において、スプレーノズル41からの冷却水による熱延鋼板10aの冷却は、核沸騰領域で行われる。
上記実施の形態の冷却装置15では熱延鋼板10aを200℃程度の低温まで冷却したが、例えば冷却装置15における冷却停止温度が低温でない場合などでは、サイドスプレー装置40の全てのスプレーノズル41から冷却水を噴射させる必要はない。かかる場合、幅方向の冷却均一性を考慮し、会合部Pを同一とするスプレーノズル対42毎に制御し、冷却に必要なスプレーノズル対42からだけ冷却水を噴射させ、冷却に不必要なスプレーノズル対42からは冷却水を噴射させないようにすることで、サイドスプレー装置40の冷却能力を調節する。このため、サイドスプレー装置40には、複数のスプレーノズル対42毎に、冷却水の供給の有無を制御する弁を設けることが好ましい。
上記実施の形態の冷却装置15では、上側冷却装置20での冷却後の板上水22の水切りにあたり、専用の水切装置30を用いていたが、図11に示すように、そのような専用の水切装置30を廃止して、サイドスプレー装置40のスプレーノズル対42を設置してもよい。すなわち、本来の熱延鋼板10aの冷却に使用されるスプレーノズル対42に加えて、搬送方向上流側に、水切り用にスプレーノズル対42を設置してもよい。
5 スラブ
10 鋼板搬送領域
10a 熱延鋼板
11 加熱炉
12 幅方向圧延機
13 粗圧延機
14 仕上圧延機
15 冷却装置
16 巻取装置
17 搬送ロール
20 上側冷却装置
21 冷却水ノズル
22 板上水
30、50 水切装置
31、51 スプレー装置
40 サイドスプレー装置
41 スプレーノズル
41a 噴射口
42 スプレーノズル対
43 衝突領域
43a 遠方端部
43b 近方端部
E 会合ゾーン
e1~e8 会合小ゾーン
F 冷却ゾーン
f1~f3 冷却小ゾーン
f11~f32 分割冷却小ゾーン
P 会合部
Claims (9)
- 連続熱間圧延工程の仕上げ圧延後の熱延鋼板を冷却する方法であって、
前記熱延鋼板が搬送ロール上で占める領域を鋼板搬送領域とするとき、鋼板搬送領域の幅方向側方の両側に一対のスプレーノズルが配置され、且つ、当該スプレーノズル対が熱延鋼板の搬送方向に並べて複数対配置され、鋼板搬送領域に対して、前記スプレーノズルから鋼板搬送領域の幅方向に冷却水を噴射して、熱延鋼板を冷却し、
前記スプレーノズルから噴射される冷却水の鋼板搬送領域での衝突領域は、噴射方向の遠方端部が鋼板搬送領域の端部に位置し、近方端部が鋼板搬送領域の内側に位置し、
前記スプレーノズル対において、2つの前記衝突領域の近方端部は幅方向に一致して会合部を形成することを特徴とする、熱延鋼板の冷却方法。 - 前記会合部は、鋼板搬送領域の幅方向中央に区画される会合ゾーン内に位置し、
前記会合ゾーンの幅は下記式(1)を満たし、
搬送方向に隣接する前記スプレーノズル対の前記会合部の幅方向の間隔は、前記衝突領域の搬送方向の長さ以上であることを特徴とする、請求項1に記載の熱延鋼板の冷却方法。
W≦(D+2d)-(D+d)sinθ2/sin(θ1+θ2) ・・・(1)
但し、
W:会合ゾーンの幅
D:鋼板搬送領域の幅
d:スプレーノズルの噴射口とその手前の鋼板搬送領域の端部との水平距離
θ1:スプレー噴射角
θ2:スプレー設置角(スプレーノズルの噴射口の垂線とスプレーノズルの噴射口から鋼板搬送領域の幅方向中心を結ぶ線の成す角) - 前記複数対のスプレーノズル対から鋼板搬送領域に向けて冷却水が噴射される冷却ゾーンは、搬送方向に複数の冷却小ゾーンに分割され、
前記冷却小ゾーンにはN対(Nは整数)のスプレーノズル対が配置され、
前記会合ゾーンは幅方向に等間隔に前記N個の会合小ゾーンに分割され、
前記冷却小ゾーンにおける前記会合小ゾーンには、それぞれ1個の前記会合部が配置され、
前記冷却小ゾーンにおける前記会合部は、搬送方向の上流側から下流側に向かい、前記会合ゾーンの一の端部の前記会合小ゾーンから他の端部の前記会合小ゾーンに向かって配置されることを特徴とする、請求項2に記載の熱延鋼板の冷却方法。 - 前記冷却小ゾーンは、搬送方向にk個(kはNの約数)の分割冷却小ゾーンに分割され、
搬送方向にi番目(iは1からkまでの整数)の前記分割冷却小ゾーンでは、前記会合部が、前記会合ゾーンの一の端部側の1番目から他の端部側のN番目に向かって、i番目からjk+i番目(jは1から(N/k-1)までの整数)に配置されることを特徴とする、請求項3に記載の熱延鋼板の冷却方法。 - 前記スプレーノズルからの冷却水による熱延鋼板の冷却は、核沸騰領域で行われることを特徴とする、請求項1~4のいずれか一項に記載の熱延鋼板の冷却方法。
- 連続熱間圧延工程の仕上げ圧延後の熱延鋼板を冷却する装置であって、
前記熱延鋼板が搬送ロール上で占める領域を鋼板搬送領域とするとき、当該鋼板搬送領域に対して、鋼板搬送領域の幅方向に冷却水を噴射するスプレーノズルが、鋼板搬送領域の幅方向側方の両側に一対に配置され、且つ、当該スプレーノズル対が熱延鋼板の搬送方向に並べて複数対配置され、
前記スプレーノズルは、当該スプレーノズルから噴射される冷却水の鋼板搬送領域での衝突領域における、噴射方向の遠方端部が鋼板搬送領域の端部に位置し、近方端部が鋼板搬送領域の内側に位置するように配置され、
前記スプレーノズル対は、2つの前記衝突領域の近方端部が幅方向に一致して会合部を形成するように配置されることを特徴とする、熱延鋼板の冷却装置。 - 前記会合部は、鋼板搬送領域の幅方向中央に区画される会合ゾーン内に位置し、
前記会合ゾーンの幅は下記式(1)を満たし、
搬送方向に隣接する前記スプレーノズル対は、それぞれの前記会合部の幅方向の間隔が、前記衝突領域の搬送方向の長さ以上であるように配置されることを特徴とする、請求項6に記載の熱延鋼板の冷却装置。
W≦(D+2d)-(D+d)sinθ2/sin(θ1+θ2) ・・・(1)
但し、
W:会合ゾーンの幅
D:鋼板搬送領域の幅
d:スプレーノズルの噴射口とその手前の鋼板搬送領域の端部との水平距離
θ1:スプレー噴射角
θ2:スプレー設置角(スプレーノズルの噴射口の垂線とスプレーノズルの噴射口から鋼板搬送領域の幅方向中心を結ぶ線の成す角) - 前記複数対のスプレーノズル対から鋼板搬送領域に向けて冷却水が噴射される冷却ゾーンは、搬送方向に複数の冷却小ゾーンに分割され、
前記冷却小ゾーンにはN対(Nは整数)のスプレーノズル対が配置され、
前記会合ゾーンは幅方向に等間隔に前記N個の会合小ゾーンに分割され、
前記冷却小ゾーンにおける前記会合小ゾーンには、それぞれ1個の前記会合部が配置され、
前記冷却小ゾーンにおける前記会合部は、搬送方向の上流側から下流側に向かい、前記会合ゾーンの一の端部の前記会合小ゾーンから他の端部の前記会合小ゾーンに向かって配置されることを特徴とする、請求項7に記載の熱延鋼板の冷却装置。 - 前記冷却小ゾーンは、搬送方向にk個(kはNの約数)の分割冷却小ゾーンに分割され、
搬送方向にi番目(iは1からkまでの整数)の前記分割冷却小ゾーンでは、前記会合部が、前記会合ゾーンの一の端部側の1番目から他の端部側のN番目に向かって、i番目からjk+i番目(jは1から(N/k-1)までの整数)に配置されることを特徴とする、請求項8に記載の熱延鋼板の冷却装置。
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JP6699808B1 (ja) * | 2018-09-19 | 2020-05-27 | 日本製鉄株式会社 | 熱延鋼板の冷却装置および熱延鋼板の冷却方法 |
CN112703067A (zh) * | 2018-09-19 | 2021-04-23 | 日本制铁株式会社 | 热轧钢板的冷却装置及热轧钢板的冷却方法 |
KR20210056401A (ko) | 2018-09-19 | 2021-05-18 | 닛폰세이테츠 가부시키가이샤 | 열연 강판의 냉각 장치 및 열연 강판의 냉각 방법 |
KR102372665B1 (ko) * | 2018-09-19 | 2022-03-10 | 닛폰세이테츠 가부시키가이샤 | 열연 강판의 냉각 장치 및 열연 강판의 냉각 방법 |
CN112703067B (zh) * | 2018-09-19 | 2022-09-16 | 日本制铁株式会社 | 热轧钢板的冷却装置及热轧钢板的冷却方法 |
US11701697B2 (en) | 2018-09-19 | 2023-07-18 | Nippon Steel Corporation | Cooling device for hot-rolled steel sheet and cooling method of hot-rolled steel sheet |
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EP3363552A1 (en) | 2018-08-22 |
TW201815489A (zh) | 2018-05-01 |
KR20190009368A (ko) | 2019-01-28 |
EP3363552B1 (en) | 2022-07-13 |
BR112018070853A2 (pt) | 2019-02-05 |
US20180290193A1 (en) | 2018-10-11 |
KR102205154B1 (ko) | 2021-01-20 |
US10350659B2 (en) | 2019-07-16 |
BR112018070853A8 (pt) | 2023-01-31 |
CN109414740B (zh) | 2020-07-31 |
TWI628011B (zh) | 2018-07-01 |
EP3363552A4 (en) | 2019-08-28 |
CN109414740A (zh) | 2019-03-01 |
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