WO2017130767A1 - 熱延鋼帯の製造設備列および熱延鋼帯の製造方法 - Google Patents
熱延鋼帯の製造設備列および熱延鋼帯の製造方法 Download PDFInfo
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- WO2017130767A1 WO2017130767A1 PCT/JP2017/001192 JP2017001192W WO2017130767A1 WO 2017130767 A1 WO2017130767 A1 WO 2017130767A1 JP 2017001192 W JP2017001192 W JP 2017001192W WO 2017130767 A1 WO2017130767 A1 WO 2017130767A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
- B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
- B21B1/34—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by hot-rolling
-
- 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
-
- 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
- B21B45/0203—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
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- 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
- B21B45/004—Heating the product
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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
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
Definitions
- the present invention relates to a hot rolling steel strip manufacturing facility row and a hot rolling steel strip manufacturing method that perform controlled rolling in the manufacture of a thick hot rolled steel strip that has a thickness of 12 mm or more and that requires high toughness. Is.
- FIG. 1 shows a general hot rolling process.
- a material to be rolled (slab) heated to about 1200 ° C. by a continuous heating furnace 1 is first forged in a sheet width direction by a sizing press 2. Then, the sheet width is adjusted, and then the material to be rolled is rolled by the rough rolling mill group 3 to form a sheet bar 10 having a thickness of 30 to 50 mm, and then the sheet bar 10 is continuously rolled for 6 to 7 stands.
- the steel sheet is rolled to 1.2 to 25 mm by a finish rolling mill group 6 to form a hot-rolled steel strip, and then cooled by a run-out table 7 and wound by a coiler 8.
- the structural steel plate has a thickness of 8 to 25 mm, has a very thick dimension in the hot-rolled steel strip, and particularly has a thickness of 12 mm or more in the line pipe material.
- CR controlled rolling
- Controlled rolling has been practiced for a long time mainly in the manufacturing process of thick steel sheets. By rolling in a low temperature range where the growth rate of steel crystal grains is slow, the crystal structure is refined and the toughness is improved.
- the temperature at which controlled rolling is started varies depending on the additive elements such as Nb and V, but is approximately 950 ° C. or less, and at least 60% reduction is performed from the controlled rolling start thickness to the product thickness.
- the controlled rolling start thickness is about 30 mm
- the controlled rolling start thickness is about 63 mm.
- the final thickness is 25 mm
- rough rolling is performed so that the sheet bar has a thickness of 63 mm before the end of rough rolling, and then the center temperature of the sheet bar is 950 ° C. or lower.
- a method is adopted in which the sheet bar is allowed to stand by air cooling in front of the finish rolling mill group 6 until it becomes, and then the finish rolling mill group 6 performs rolling. At this time, since it takes about 200 to 300 seconds to wait for the sheet bar in front of the finish rolling mill group 6, the next material cannot be rolled during this time, and the rolling efficiency is greatly reduced.
- JP 2011-143459 A Japanese Patent No. 4720250 JP-A-4-274814 Japanese Patent No. 4946516
- a cooling device of about 15 to 300 ° C./second is installed on the entry side or the exit side of a reversible roughing mill, and cooling is performed between passes of the rolling pass of the roughing mill.
- the target controlled rolling start temperature is reached by the start of controlled rolling.
- this technique has a problem that when the cooling rate is high and the plate thickness is large, the temperature difference between the surface and the center of the steel material becomes large, and the surface layer of the sheet bar may be lower than the phase transformation temperature during water cooling. . In this case, only the surface layer of the sheet bar may undergo ferrite transformation and may not satisfy a predetermined mechanical test value.
- Patent Document 2 relates to a method for simultaneously rolling a plurality of rolled materials, and after rolling is completed to a thickness before controlled rolling, the rolled material is temporarily moved on a transport table far from the rolling mill. This is a technique for minimizing the idling time of the rolling mill by allowing the next material to be rolled during that time.
- this technique has a problem that although the efficiency improvement effect is large when the waiting time by air cooling until the start of controlled rolling and the rolling time are substantially the same, the rolling efficiency does not increase so much when they are greatly different.
- Patent Document 3 discloses a lifting device having a cantilevered fork-like arm that lifts a steel plate that has been rolled before controlled rolling to a height that allows the next material to be rolled to pass through and holds it in a standby state. . This is a very useful technique when the thickness of the sheet bar is sufficiently thick and matches the rolling time of the sheet bar through which the waiting time of the waiting sheet bar passes.
- the weight of the slab is 20-30 tons larger than that of the thick steel plate, and the length of the seat bar is extremely long, for example, exceeding 20 m, so a large lifting device is required. become.
- Patent Document 4 discloses that in order to reinforce the weak point of the above-mentioned document, in addition to the lifting device of Patent Document 3, water cooling devices are installed before and after the rolling mill. However, in this document as well as Patent Document 3, if rolling is performed on sheet bars of various sizes and temperature conditions, the idle time of the hot rolling mill is reduced and the rolling efficiency is improved. It is not shown whether it can.
- the object of the present invention is to efficiently reduce the time required to start controlled rolling while preventing the surface layer of the sheet bar from falling below the phase transformation temperature during cooling performed prior to controlled rolling. It is in proposing the manufacturing equipment row
- the production equipment row of the hot-rolled steel strip of the present invention that advantageously solves the above problems comprises a rough rolling machine comprising a plurality of rough rolling mills that hot-roll a material to be rolled to a predetermined temperature to obtain a finish rolling start plate thickness.
- a hot rolling steel strip manufacturing facility line comprising a rolling mill group and a finish rolling mill group composed of a plurality of finish rolling mills that control-roll the material to be rolled to a finish plate thickness, At least one of the plurality of rough rolling mills is a reversible rolling mill;
- a slow cooling device that slowly cools the material to be rolled at a water density of less than 1000 L / min ⁇ m 2 , and the rolled material after the slow cooling at a water density of 1000 L / min ⁇ m 2 or more
- One of the rapid cooling devices for rapidly cooling the material is provided, and the other of the slow cooling device and the rapid cooling device is provided downstream of the reversible rolling mill.
- the rough rolling mill disposed at least on the most downstream side among the plurality of rough rolling mills is a reversible rolling mill.
- the slow cooling device is disposed upstream of the reversible rolling mill and the rapid cooling device is disposed downstream.
- the material to be rolled is slowly cooled by the slow cooling device when the plate thickness is 80 mm or more, and is rapidly cooled when the plate thickness is less than 80 mm. It is preferred to be cooled rapidly by the apparatus.
- the cooling time by the slow cooling device and the rapid cooling device is set so that the surface temperature during cooling of the material to be rolled is 600 ° C. or more. It is preferred that
- board thickness of the finishing rolling mill of the last stage is 12 mm or more among the plurality of finishing rolling mills.
- the method for producing a hot-rolled steel strip of the present invention that advantageously solves the above-mentioned problem is to hot-roll the material to be rolled heated to a predetermined temperature with a plurality of rough rolling mills to a finish rolling start plate thickness
- a method for producing a hot-rolled steel strip in which a material to be rolled is controlled and rolled to a finished sheet thickness by a plurality of finish rolling mills, At least one of the plurality of rough rolling mills is a reversible rolling mill; Upstream of the reversible rolling mill, rapidly cooling the material to be rolled by the slow cooling device and 1000L / min ⁇ m 2 or more water density to slow cool the material to be rolled at a water flow rate of less than 1000L / min ⁇ m 2 One of the rapid cooling devices is disposed, and the other of the slow cooling device and the rapid cooling device is disposed downstream of the reversible rolling mill, After the material to be rolled is slowly cooled at a water density of less than 1000
- a roughing mill disposed at least on the most downstream side of the plurality of roughing mills is a reversible rolling mill.
- the slow cooling device upstream of the reversible rolling mill and the rapid cooling device downstream.
- the material to be rolled is slowly cooled by the slow cooling device when the plate thickness is 80 mm or more, and the rapid cooling is performed when the plate thickness is less than 80 mm. It is preferable to perform rapid cooling by the apparatus.
- the material to be rolled is cooled so that the surface temperature during the cooling of the material to be rolled cooled by the slow cooling device and the rapid cooling device is 600 ° C. or higher. It is preferable to do.
- board thickness of the finishing rolling mill of the last stage is made into 12 mm or more among the plurality of finishing rolling mills.
- the material to be rolled is less than 1000 L / min ⁇ m 2 by a slow cooling device. And slowly cooling the material to be rolled after slow cooling at a water density of 1000 L / min ⁇ m 2 or more by a rapid cooling device on the downstream side or upstream side of the reversible rolling mill.
- the cooling rate is relatively low, but the cooling of the surface layer of the sheet bar does not fall below the phase transformation temperature even if it is cooled for a relatively long time.
- the cooling rate can be increased to cool to the desired controlled rolling start temperature in a short time.
- a hot-rolled steel strip can be efficiently manufactured while reducing the time required to start controlled rolling.
- a graph showing the relationship between the cooling water density and the limit temperature drop of the cross-sectional average when the sheet bar is cooled until the surface temperature of the sheet bar reaches 600 ° C. for sheet bars having various plate thicknesses with an initial surface temperature of 1000 ° C. is there. It is a graph which shows the relationship between a cooling water amount density and the cooling rate of the cross-sectional average of a sheet bar about the sheet bar of various board thickness whose initial surface temperature is 1000 degreeC. It is a block diagram which shows typically other embodiment of the manufacturing equipment row
- FIG. 1 is a configuration diagram schematically showing a general hot-rolled steel strip production facility row together with a rolling pass.
- a material to be rolled (slab) having a thickness of, for example, 260 mm is heated to 1170 ° C. in a continuous heating furnace 1, and thereafter, rough rolling mill group 3
- the sheet bar 10 is a sheet-like material to be rolled having a predetermined thickness.
- the sizing press 2 installed on the exit side of the continuous heating furnace 1 is crushed down to a predetermined size in the width direction,
- the edger 4 installed at a position close to the rolling mill is similarly rolled down in the width direction.
- the sheet bar 10 is finish-rolled to a predetermined thickness (for example, 20 mm) with a finish rolling mill group 6 to form a hot-rolled steel strip, After being cooled to a predetermined temperature by the runout table 7, it is wound up by a coiler 8.
- a predetermined thickness for example, 20 mm
- the rough rolling mill group 3 includes two rough rolling mills 31 and 32, and the reverse rolling mill 31 capable of reverse rolling is provided on the upstream side (heating furnace side) of the rough rolling mill group 3.
- a nonreciprocal rolling mill 32 capable of rolling only in the conveyance direction to the downstream side is disposed on the downstream side.
- the sheet bar 10 rolled to a predetermined controlled rolling start thickness is subjected to oscillation standby between the rough rolling mill group 3 and the finish rolling mill group 6 until the sheet bar 10 is lowered to a predetermined controlled rolling start temperature.
- the surface temperature of the sheet bar 10 is measured by the radiation thermometer 33, and after confirming that the surface temperature of the sheet bar 10 has been lowered to a predetermined controlled rolling start temperature, the sheet bar 10 is fed to the finish rolling mill group 6 and controlled. Rolling is performed. At this time, since the temperature is lowered by about 150 to 250 ° C. by air cooling, it is necessary to wait for about 60 to 300 seconds. During this time, the finish rolling mill group 6 cannot perform rolling, leading to a reduction in rolling efficiency.
- the thickness of the seat bar 10 at this time is 50 mm, for example, the length of the seat bar 10 is as long as about 50 m. Therefore, as disclosed in the prior art documents 3 and 4, the lifting device for lifting the seat bar, etc. It is not realistic to introduce this mechanism.
- the rapid cooling device 41 having a water density of 1000 L / min ⁇ m 2 or more is disposed on the upstream side or the downstream side of the reversible rolling mill 31 of the rough rolling mill group 3, and the reversible rolling mill.
- a slow cooling device 42 having a water density of less than 1000 L / min ⁇ m 2 on the downstream side or the upstream side of 31 a configuration in which cooling and rolling are simultaneously performed in the rough rolling mill group 3 is adopted.
- the temperature of the sheet bar 10 can be adjusted to be equal to the control rolling start temperature, and the control rolling temperature waiting time can be greatly shortened.
- FIG. 2 shows a hot-rolled steel according to the present invention in which one embodiment of the method for producing a hot-rolled steel strip according to the present invention, in which a rapid cooling device 41 and a slow cooling device 42 are added to the production equipment row shown in FIG.
- a rapid cooling device 41 is disposed on the downstream side of the reversible rolling mill 31, and a slow cooling device 42 is disposed on the upstream side.
- a rapid cooling device 41 is disposed on the downstream side of the reversible rolling mill 31, and a slow cooling device 42 is disposed on the upstream side.
- a slow cooling device 42 is disposed on the upstream side.
- the slow cooling device 42 stops water discharge, and the rapid cooling device 41 installed on the downstream side of the reversible rolling mill 31 is operated to perform reversible rolling.
- the rapid cooling device 41 installed on the downstream side of the reversible rolling mill 31 is operated to perform reversible rolling.
- Passing cooling of the seat bar 10 is performed.
- the rapid cooling device 41 and the slow cooling device 42 are selectively used according to the thickness of the sheet bar 10 that is repeatedly rolled by the reversible rolling mill 31.
- the reason is as follows.
- FIG. 3 shows the temperature history of the surface when the sheet bar 10 having a plate thickness of 40 mm is cooled at various cooling water density.
- the time region in which the temperature suddenly decreases indicates that water cooling has been performed, and the time region in which the temperature has increased through the lower limit temperature has been stopped and allowed to cool (air cooling). Is shown. From this figure, it can be seen that the cooling rate of the surface (temperature temperature gradient) increases as the water density of the cooling water increases.
- the temperature of the outermost layer of the sheet bar 10 during water cooling is preferably maintained at 600 ° C. or higher.
- the water cooling is stopped when the surface temperature of the seat bar 10 reaches the lower limit temperature of 600 ° C.
- FIG. 4 shows the average cross-sectional temperature of the sheet bar 10 at that time. Similarly, the time region where the temperature rapidly decreases in the figure indicates that water cooling was performed.
- the cooling water quantity density is high, the time gradient of the cross-sectional average temperature of the sheet bar 10, that is, the cooling rate becomes steep, but the cooling water is used from the viewpoint of maintaining the surface temperature at 600 ° C. or higher and preventing cracks from ferrite grain boundaries. Therefore, the higher the cooling water quantity density, the higher the temperature at the end of cooling. Therefore, it can be seen that the smaller the cooling water density, the slower the cooling rate, but the larger the temperature drop that can be cooled at one time.
- FIG. 5 shows the relationship between the cooling water density and the average temperature drop of the cross-section when the surface temperature is 600 ° C. for sheet bars 10 having various plate thicknesses with an initial surface temperature of 1000 ° C. .
- the surface temperature is kept at 600 ° C. or higher, so that the cooling temperature drop by one water cooling decreases as the plate thickness increases and the cooling water density increases. Become.
- the temperature that can be lowered by one cooling due to the restriction of the surface temperature of 600 ° C. is referred to as a critical temperature drop amount.
- FIG. 6 shows the relationship between the water density of the cooling water and the cross-sectional average of the cooling rate of the sheet bar 10 for the sheet bar 10 having various plate thicknesses with an initial surface temperature of 1000 ° C.
- the cooling rate is faster as the water density of the cooling water is larger. For this reason, considering the above constraints, when cooling below the limit temperature drop, the temperature can be lowered in a shorter time by increasing the water density of the cooling water. Is advantageous.
- a slab having a thickness of about 220 to 260 mm is rolled to about 45 mm in about 10 passes. Since the sheet thickness tends to be large and the critical temperature drop amount tends to be small at the beginning of rolling, slow cooling with a large critical temperature drop amount is advantageous in terms of the lower limit temperature of the surface per pass. Under the condition that the plate thickness is reduced in the later stage of rolling, the amount of critical temperature drop can be increased. Therefore, rapid cooling in which water is cooled in a short time by increasing the cooling rate is more advantageous.
- the limit temperature drop amount is larger when the sheet thickness is smaller, when a plurality of rough rolling mills are provided, the upstream side and the downstream side of the most downstream reversible rolling mill 31 corresponding to the smallest sheet thickness. It is preferred to carry out the cooling in
- the critical temperature drop amount becomes large at the low water amount density at the boundary of the cooling water amount density of 1000 L / min ⁇ m 2 . Therefore, from the viewpoint of preventing ferrite cracks on the surface of the sheet bar 10, when the plate thickness is 80 mm or more, a large limit temperature drop can be ensured by setting the water density of the cooling water to less than 1000 L / min ⁇ m 2 .
- cooling to a predetermined temperature (controlled rolling start temperature) desirable for controlled rolling is dispersed in a plurality of passes, and cooling is performed at about 20 to 30 ° C. in one pass.
- the slow cooling device 42 having a water density of less than 1000 L / min ⁇ m 2
- the ferrite on the surface of the sheet bar 10 is cooled by cooling with the rapid cooling device 41 having a water density of 1000 L / min ⁇ m 2 or more. Efficient cooling can be performed while preventing cracks, and the rolling time can be shortened.
- the amount of cooling water in the slow cooling device 42 is preferably 200 L / min ⁇ m 2 or more.
- the rapid cooling device 41 as the cooling water amount density is increased, the amount of temperature drop due to water cooling per pass is reduced, but the cooling rate is increased. For this reason, in the range where the limit cooling capacity per pass does not change so much, the equipment cost increases with the increase in the amount of cooling water, so the water density of the cooling water is preferably 6000 L / min ⁇ m 2 or less.
- the cooling devices 41 and 42 may be of any type such as group jet cooling composed of a plurality of circular tube nozzles, pipe laminar, mist cooling, spray cooling, etc.
- the rapid cooling device 41 since the rapid cooling device 41 has a large amount of cooling water, it is a sheet. As a result, thick stagnant water is likely to be generated on the bar 10, and the cooling water into which the stagnant water is jetted may interfere with the collision with the steel plate surface. As a result, stable cooling may not be obtained. Therefore, it is preferable to use a group jet cooling device having a plurality of circular tube nozzles (the nozzle cross section may be elliptical or polygonal) having a high penetrating force for the liquid film as the rapid cooling device 41.
- the slow cooling device 42 is not particularly limited, and a pipe laminar method or a spray method generally used in a cooling device for a hot-rolled steel strip can be used.
- the cooling method by the cooling devices 41 and 42 includes a stop type cooling method in which the seat bar 10 is cooled while being stopped or oscillated, and a passing type in which the sheet bar 10 is cooled while being passed through the cooling devices 41 and 42. There is a cooling system.
- the equipment length of the cooling devices 41 and 42 is required to be equal to or longer than the length of the seat bar 10, and the cooling devices 41 and 42 are enlarged. Therefore, by adopting a passing-type cooling method, the cooling devices 41 and 42 can be reduced in size, and can be disposed in the immediate vicinity of the reversible rolling mill 31.
- the rolling steel strip production facility line of the present embodiment may include a rolling pass schedule creation device 51 and a cooling pass schedule creation device 52.
- the rolling pass schedule creation device 51 is configured by a personal computer or the like, and each roughening is performed so that the number of passes is reduced as much as possible within the restriction of the rolling amount of each rolling pass from the input slab thickness, controlled rolling start thickness, and the like.
- a pass schedule such as the amount of reduction and the number of passes in the rolling mills 31 and 32 is calculated and created.
- the cooling pass schedule creation device 52 is configured by a personal computer or the like, and based on the thickness of the sheet bar 10 after each rolling pass calculated by the rolling pass schedule creation device 51, the sheet bar 10 for each cooling pass.
- the sheet thickness is 80 mm or more
- the slow cooling by the slow cooling device 42 is assigned
- the thickness of the seat bar 10 is less than 80 mm
- the rapid cooling by the rapid cooling device 41 is assigned, and cooling at a predetermined plate thickness obtained by a prior experiment or the like is assigned.
- the number of cooling passes and the cooling time are calculated from the relationship between the water density and the temperature drop, and the relationship between the surface temperature of the seat bar 10 and the cooling time at a predetermined cooling water density obtained by a prior experiment or the like.
- the cooling path schedule creation device 52 calculates the cooling time and the plate passing speed by the slow cooling device 42 and the rapid cooling device 41 so that the surface temperature during cooling of the seat bar 10 does not fall below 600 ° C.
- the cooling pass schedule created by the cooling pass schedule creation device 52 may be fed back to the rolling pass schedule creation device 52.
- the rolling pass schedule creation device 51 may add a rolling pass with a reduction amount of zero, and perform water cooling after this rolling pass.
- the rolling pass schedule and the cooling pass schedule created in this way are output to the rough rolling mills 31 and 32 and the cooling devices 41 and 42, and each of the devices 31, 32, 41, and 42 performs rolling and cooling according to the schedule. carry out.
- the rough rolling mill group 3 has been described as including one reversible rolling mill 31 and a non-reversible rolling mill 32.
- the rough rolling mill group 3 includes a plurality of reversible rolling mills 31. You may do it.
- FIG. 7 shows a hot rolling steel strip manufacturing facility row and a hot rolling steel strip manufacturing method using the same according to another embodiment of the present invention.
- the rough rolling mill group 3 includes three reversible rolling mills 31.
- a slow cooling device 42 is disposed on the upstream side of the reversible rolling mill 31 on the most downstream side in the rolling direction, and a rapid cooling device 41 is disposed on the downstream side.
- the lower part of the figure also shows the water cooling timing during the rolling process.
- rolling is started from the most upstream reversible rolling mill 31 on the left side in the figure, and each reversible rolling mill 31 performs three-pass rolling.
- the most upstream reversible rolling mill 31 and the central reversible rolling mill 31 perform rolling according to a rolling schedule having a sheet thickness of 80 mm or more of the sheet bar 10
- the most downstream reversible rolling mill 31 is the sheet bar 10. It is comprised so that rolling may be performed with a rolling schedule with a plate thickness of less than 80 mm.
- the target rolling material (rolled material) was steel, and as shown in Table 1 below, the product thickness was 15 mm and 22 mm, and the controlled rolling reduction was 65%. That is, the controlled rolling start thickness is 43 mm and 63 mm.
- the controlled rolling start temperature was 880 ° C.
- Comparative Examples 1 and 2 using the line shown in FIG. 1, the rolling material is heated to 1170 ° C. in the continuous heating furnace 1, and then to the controlled rolling start thickness described in Table 1 in the rough rolling mill group 3.
- the sheet bar 10 was rolled, and the surface temperature of the sheet bar 10 was confirmed to be 880 ° C. ⁇ 5 ° C. with the radiation thermometer 33, and then rolled by the finish rolling mill group 6.
- the sheet bar 10 is allowed to oscillate until the predetermined controlled rolling start temperature is reached between the rough rolling mill group 3 and the finish rolling mill group 6. .
- Example 1 in the rough rolling process, a slow cooling device 42 is disposed upstream of the reversible rolling mill 31 of the rough rolling mill group 3 and a rapid cooling device 41 is disposed downstream. Water cooling was performed.
- Example 2 rolling and water cooling were performed according to the pass schedule described in Table 2 below, and in Example 2, rolling and cooling were performed according to the pass schedule shown in Table 3 below.
- Example 2 rolling was performed according to the pass schedule of Table 2 for Comparative Example 1 and according to the pass schedule of Table 3 for Comparative Example 2, but water cooling was not performed.
- the rapid cooling device 41 is a group jet cooling device in which a large number of circular pipe nozzles having a hole diameter of 5 mm are arranged at a pitch of 60 mm in the transport direction (rolling direction) and the width direction, and the cooling water density is 2500 L / min ⁇ m 2 . did.
- the slow cooling device 42 a hairpin type pipe laminar cooling device arranged on the upper surface side of the seat bar 10 and a spray cooling device arranged on the lower surface side of the seat bar 10 are used, and the cooling water density is 800L / It was set to min ⁇ m 2 . Further, the rolling speed and the cooling device passing speed were controlled so that the surface temperature of the sheet bar 10 during cooling was 600 ° C. or higher.
- Example 1 is an example of a product thickness of 15 mm.
- the waiting time before the finish rolling mill group 6 was about 10 seconds, and the total of the waiting time and the rough rolling time was 462 seconds. Note that the waiting time of 10 seconds is the time required to confirm the temperature with the radiation thermometer 33 in front of the finishing rolling mill group 6, and no substantial waiting time has occurred.
- Comparative Example 1 in which rolling was performed according to the same rolling pass schedule as in Example 1 but the cooling devices 41 and 42 proposed in the present invention were not used, the temperature of the sheet bar 10 when it reached the finish rolling mill group 6 was 948 ° C., which was 68 ° C. higher than the target 880 ° C., and was waited for 95 seconds (air cooling) in front of the finish rolling mill group 6 until the target temperature was reached.
- the total of the waiting time and rough rolling time was 516 seconds, which was 54 seconds longer than Example 1.
- Example 2 is an example of a product thickness of 22 mm.
- the standby time in front of the finish rolling mill group 6 was about 10 seconds as in Example 1, and the total of the standby time and the rough rolling time was 456 seconds, which was almost the same rolling time as in Example 1.
- the waiting time of 10 seconds is the time required to confirm the temperature with the radiation thermometer 33 in front of the finishing rolling mill group 6, and no substantial waiting time has occurred.
- Rolling was performed according to the same rolling pass schedule as in Example 2, but in Comparative Example 2 in which the cooling devices 41 and 42 proposed in the present invention were not used, the temperature of the sheet bar 10 when it reached the finish rolling mill group 6 was 989 ° C., which was 109 ° C. higher than the target 880 ° C., and was kept waiting (air cooling) for 221 seconds in front of the finish rolling mill group 6 until the target temperature was reached.
- the total of the waiting time and the rough rolling time was 576 seconds, which was 120 seconds longer than Example 2.
- the rapid cooling device 41 and the slow cooling device 42 are installed in the rough rolling mill group 3, and the rapid cooling and the slow cooling are properly used according to the thickness of the sheet bar 10, so that they are extracted from the heating furnace and finished. It was confirmed that the time until the rolling was started was shortened by 54 seconds for a material having a product thickness of 15 mm and 120 seconds for a material having a product thickness of 22 mm.
- the cooling by the rapid cooling device 41 and the slow cooling device 42 may not be performed in relation to all odd-numbered or even-numbered rolling passes of the reversible rolling mill 31, and the amount of temperature drop due to water cooling is large.
- the temperature when the rolling mill arrives is lower than the scheduled start temperature of finish rolling, water cooling of an arbitrary pass may not be performed.
- the slow cooling device 42 and the rapid cooling device 41 are arranged on the upstream side and the downstream side of the most downstream reversible rolling mill 31 as viewed in the rolling direction is shown.
- the quick cooling device 41 can be arranged on the upstream side
- the slow cooling device 42 can be arranged on the downstream side.
- the present invention while preventing the surface layer of the sheet bar from falling below the phase transformation temperature during cooling prior to controlled rolling, the time required to start controlled rolling is reduced and the hot-rolled steel strip is efficiently formed. Can be manufactured.
Abstract
Description
前記複数の粗圧延機のうちの少なくとも1つが可逆式圧延機であり、
前記可逆式圧延機の上流側に、1000L/min・m2未満の水量密度で被圧延材を緩冷却する緩冷却装置および1000L/min・m2以上の水量密度で前記緩冷却後の被圧延材を急冷却する急冷却装置のうちの一方を備えるとともに、前記可逆式圧延機の下流側に、前記緩冷却装置および前記急冷却装置のうちの他方を備えることを特徴とするものである。
前記複数の粗圧延機のうちの少なくとも1つが可逆式圧延機であり、
前記可逆式圧延機の上流側に、1000L/min・m2未満の水量密度で被圧延材を緩冷却する緩冷却装置および1000L/min・m2以上の水量密度で被圧延材を急冷却する急冷却装置のうちの一方が配置されるとともに、前記可逆式圧延機の下流側に前記緩冷却装置および前記急冷却装置のうちの他方が配置されており、
被圧延材を前記緩冷却装置により1000L/min・m2未満の水量密度で緩冷却した後に、該被圧延材を前記急冷却装置により1000L/min・m2以上の水量密度で急冷却することを特徴とするものである。
2 サイジングプレス
3 粗圧延機群
4 エッジャー
5 クロップシャー
6 仕上げ圧延機群
7 ランアウトテーブル
8 コイラー
10 シートバー
31 可逆式圧延機
32 非可逆式圧延機
33 放射温度計
41 急冷却装置
42 緩冷却装置
51 圧延パススケジュール作成装置
52 冷却パススケジュール作成装置
Claims (12)
- 所定温度に加熱された被圧延材を熱間圧延して仕上げ圧延開始板厚にする複数の粗圧延機からなる粗圧延機群と、該被圧延材を仕上げ板厚まで制御圧延する複数の仕上げ圧延機からなる仕上げ圧延機群とを備える熱延鋼帯の製造設備列であって、
前記複数の粗圧延機のうちの少なくとも1つが可逆式圧延機であり、
前記可逆式圧延機の上流側に、1000L/min・m2未満の水量密度で被圧延材を緩冷却する緩冷却装置および1000L/min・m2以上の水量密度で前記緩冷却後の被圧延材を急冷却する急冷却装置のうちの一方を備えるとともに、前記可逆式圧延機の下流側に、前記緩冷却装置および前記急冷却装置のうちの他方を備えることを特徴とする熱延鋼帯の製造設備列。 - 前記複数の粗圧延機のうち少なくとも最下流に配置された粗圧延機が可逆式圧延機である、請求項1に記載の熱延鋼帯の製造設備列。
- 前記可逆式圧延機の上流側に前記緩冷却装置が、下流側に前記急冷却装置がそれぞれ配置されている、請求項1または2に記載の熱延鋼帯の製造設備列。
- 前記被圧延材は、その板厚みが80mm以上では前記緩冷却装置により緩冷却され、その板厚みが80mm未満では前記急冷却装置により急冷却される、請求項1~3のいずれか一項に記載の熱延鋼帯の製造設備列。
- 前記緩冷却装置および前記急冷却装置による冷却時間は、被圧延材の冷却中の表面温度が600℃以上となるようそれぞれ設定される、請求項1~4のいずれか一項に記載の熱延鋼帯の製造設備列。
- 前記複数の仕上げ圧延機のうち最終段の仕上げ圧延機の出側板厚は12mm以上である、請求項1~5のいずれか一項に記載の熱延鋼帯の製造設備列。
- 所定温度に加熱された被圧延材を複数の粗圧延機により熱間圧延して仕上げ圧延開始板厚にし、該被圧延材を複数の仕上げ圧延機により仕上げ板厚まで制御圧延する熱延鋼帯の製造方法であって、
前記複数の粗圧延機のうちの少なくとも1つが可逆式圧延機であり、
前記可逆式圧延機の上流側に、1000L/min・m2未満の水量密度で被圧延材を緩冷却する緩冷却装置および1000L/min・m2以上の水量密度で被圧延材を急冷却する急冷却装置のうちの一方が配置されるとともに、前記可逆式圧延機の下流側に前記緩冷却装置および前記急冷却装置のうちの他方が配置されており、
被圧延材を前記緩冷却装置により1000L/min・m2未満の水量密度で緩冷却した後に、該被圧延材を前記急冷却装置により1000L/min・m2以上の水量密度で急冷却することを特徴とする熱延鋼帯の製造方法。 - 前記複数の粗圧延機のうち少なくとも最下流に配置された粗圧延機が可逆式圧延機である、請求項7に記載の熱延鋼帯の製造方法。
- 前記可逆式圧延機の上流側に前記緩冷却装置を、下流側に前記急冷却装置をそれぞれ配置する、請求項7または8に記載の熱延鋼帯の製造方法。
- 前記被圧延材を、その板厚みが80mm以上では前記緩冷却装置により緩冷却を行い、その板厚みが80mm未満では前記急冷却装置により急冷却を行う、請求項7~9のいずれか一項に記載の熱延鋼帯の製造方法。
- 前記緩冷却装置および前記急冷却装置で冷却する被圧延材の冷却中の表面温度が600℃以上となるよう被圧延材を冷却する、請求項7~10のいずれか一項に記載の熱延鋼帯の製造方法。
- 前記複数の仕上げ圧延機のうち最終段の仕上げ圧延機の出側板厚を12mm以上とする、請求項7~11のいずれか一項に記載の熱延鋼帯の製造方法。
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008108483A1 (ja) * | 2007-03-05 | 2008-09-12 | Jfe Steel Corporation | 強度および靭性の均質性に優れた薄肉厚鋼板、その製造方法、およびその製造設備 |
JP2008246579A (ja) * | 2007-03-05 | 2008-10-16 | Jfe Steel Kk | 厚鋼板の製造方法および製造設備 |
JP2015217411A (ja) * | 2014-05-16 | 2015-12-07 | Jfeスチール株式会社 | 厚鋼板の製造方法 |
Family Cites Families (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4720250Y1 (ja) | 1968-11-25 | 1972-07-07 | ||
JPS4946516B1 (ja) | 1970-12-24 | 1974-12-10 | ||
JPS5332328B2 (ja) | 1972-09-12 | 1978-09-07 | ||
JP2500266B2 (ja) | 1991-02-27 | 1996-05-29 | 川崎製鉄株式会社 | 熱間連続圧延ラインにおける冷却時間待ち圧延材の待機装置 |
JP3307771B2 (ja) * | 1993-08-23 | 2002-07-24 | ハンス‐ユルゲン、ガイドール | 熱間圧延鋼板のデスケーリング手段 |
US5540074A (en) * | 1994-12-07 | 1996-07-30 | Ipsco Enterprises Inc. | Unitary assembly of peripheral devices for use with steckel mill |
US5810951A (en) * | 1995-06-07 | 1998-09-22 | Ipsco Enterprises Inc. | Steckel mill/on-line accelerated cooling combination |
US5755128A (en) * | 1995-08-31 | 1998-05-26 | Tippins Incorporated | Method and apparatus for isothermally rolling strip product |
EP0761326B1 (de) * | 1995-09-06 | 2000-02-09 | Sms Schloemann-Siemag Aktiengesellschaft | Warmbandproduktionsanlage für das Walzen von dünnem Walzband |
BR9714411A (pt) * | 1996-12-19 | 2000-04-18 | Hoogovens Staal Bv | Progresso e dispositivo para a produção de uma tira ou lâmina de aço |
IT1290743B1 (it) * | 1997-04-10 | 1998-12-10 | Danieli Off Mecc | Procedimento di laminazione per prodotti piani con spessori sottili e relativa linea di laminazione |
JP2000317501A (ja) * | 1999-05-07 | 2000-11-21 | Sumitomo Metal Ind Ltd | 熱間圧延設備および熱間圧延方法 |
JP3642024B2 (ja) * | 2000-12-15 | 2005-04-27 | Jfeスチール株式会社 | 熱延鋼帯の熱間圧延設備および圧延方法 |
DE10110324A1 (de) * | 2001-03-03 | 2002-09-05 | Sms Demag Ag | Verfahren zum Entzundern von Bändern |
JP4604564B2 (ja) * | 2003-06-13 | 2011-01-05 | Jfeスチール株式会社 | 厚鋼板の制御冷却方法及び装置 |
JP4720250B2 (ja) | 2005-03-31 | 2011-07-13 | Jfeスチール株式会社 | 鋼材の制御圧延方法 |
CN100438997C (zh) | 2005-05-20 | 2008-12-03 | 中冶东方工程技术有限公司 | 紧凑型中宽带钢生产工艺 |
CN1883835A (zh) * | 2005-06-20 | 2006-12-27 | 中冶东方工程技术有限公司 | 常规板坯连铸连轧板卷的生产方法 |
EP1935522B1 (en) | 2005-08-30 | 2015-11-18 | JFE Steel Corporation | Reversing rolling mill with cooling facility and corresponding method of cooling a steel plate or sheet |
DE102006047718A1 (de) * | 2006-10-09 | 2008-04-17 | Siemens Ag | Verfahren zur Nachverfolgung des physikalischen Zustands eines Warmblechs oder Warmbands im Rahmen der Steuerung einer Grobblechwalzstraße zur Bearbeitung eines Warmblechs oder Warmbands |
DE102006048427B3 (de) * | 2006-10-12 | 2008-05-21 | Siemens Ag | Walzanlage, nachgerüstete Walzanlage, Walzwerk oder Walzstraße, Verfahren zum Ansteuern einer Walzanlage und Verwendung eines ersten Gerüsts einer Walzanlage |
JP5058652B2 (ja) * | 2007-03-29 | 2012-10-24 | 新日本製鐵株式会社 | 母材および溶接熱影響部の低温靭性に優れた厚鋼板の製造方法 |
JP4907587B2 (ja) * | 2008-03-31 | 2012-03-28 | 新日本製鐵株式会社 | 鋼板冷却設備及び鋼板冷却方法 |
JP4924579B2 (ja) | 2008-09-08 | 2012-04-25 | Jfeスチール株式会社 | 熱延鋼帯の冷却装置と、その冷却方法 |
JP4678069B1 (ja) * | 2009-03-30 | 2011-04-27 | Jfeスチール株式会社 | 熱延鋼板の冷却装置 |
WO2011048671A1 (ja) * | 2009-10-21 | 2011-04-28 | 東芝三菱電機産業システム株式会社 | 制御設定装置及び制御設定方法 |
JP2011143459A (ja) | 2010-01-15 | 2011-07-28 | Jfe Steel Corp | 厚鋼板の製造方法 |
IT1405344B1 (it) * | 2010-06-14 | 2014-01-03 | Danieli Off Mecc | Linea di laminazione e relativo procedimento |
IT1405453B1 (it) * | 2010-06-14 | 2014-01-10 | Danieli Off Mecc | Procedimento di laminazione per prodotti piani e relativa linea di laminazione |
-
2016
- 2016-01-27 JP JP2016013537A patent/JP6233614B2/ja active Active
-
2017
- 2017-01-16 KR KR1020187021493A patent/KR102103367B1/ko active IP Right Grant
- 2017-01-16 EP EP17743998.1A patent/EP3409390B1/en active Active
- 2017-01-16 CN CN201780008181.4A patent/CN108602102B/zh active Active
- 2017-01-16 WO PCT/JP2017/001192 patent/WO2017130767A1/ja active Application Filing
- 2017-01-16 US US16/072,968 patent/US11020780B2/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008108483A1 (ja) * | 2007-03-05 | 2008-09-12 | Jfe Steel Corporation | 強度および靭性の均質性に優れた薄肉厚鋼板、その製造方法、およびその製造設備 |
JP2008246579A (ja) * | 2007-03-05 | 2008-10-16 | Jfe Steel Kk | 厚鋼板の製造方法および製造設備 |
JP2015217411A (ja) * | 2014-05-16 | 2015-12-07 | Jfeスチール株式会社 | 厚鋼板の製造方法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP3409390A4 * |
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