WO2014156086A1 - Thick steel plate manufacturing device and manufacturing method - Google Patents
Thick steel plate manufacturing device and manufacturing method Download PDFInfo
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- WO2014156086A1 WO2014156086A1 PCT/JP2014/001615 JP2014001615W WO2014156086A1 WO 2014156086 A1 WO2014156086 A1 WO 2014156086A1 JP 2014001615 W JP2014001615 W JP 2014001615W WO 2014156086 A1 WO2014156086 A1 WO 2014156086A1
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- WIPO (PCT)
- Prior art keywords
- steel plate
- thick steel
- cooling
- descaling
- cooling water
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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
- B21B45/02—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
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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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
- B21B2001/225—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 by hot-rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0071—Levelling the rolled product
-
- 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
Definitions
- the present invention relates to a manufacturing apparatus and a manufacturing method for a thick steel plate that performs hot rolling, shape correction, and controlled cooling of the thick steel plate.
- Patent Document 1 discloses a method in which descaling is performed at least immediately before and immediately after the final pass of finish rolling, followed by hot correction, and then descaling and forced cooling.
- Patent Document 2 discloses a method of performing control cooling after performing descaling after performing finish rolling and hot straightening.
- Patent Document 3 discloses a method of performing descaling while controlling the collision pressure of cooling water immediately before the controlled cooling.
- the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and by uniformizing the scale generated on the surface of the thick steel plate in the descaling process, it is uniform in the cooling process. It aims at providing the manufacturing equipment and manufacturing method of a thick steel plate which cools and was excellent in the thick steel plate shape.
- the present inventors diligently studied the force that causes scale peeling by cooling water.
- the energy density of cooling water injected from the descaling device to the steel plate is 0.10 J /. It was found that the thickness of the scale generated on the surface after the product is uniform when the thickness is 2 mm or more. As a result, it has been found that when passing through the accelerated cooling apparatus, the steel plate can be uniformly cooled with almost no variation in the surface temperature at the position in the width direction of the thick steel plate, resulting in a thick steel plate having an excellent thick steel plate shape.
- the gist of the present invention is as follows. [1] Hot rolling mill, shape correction device, descaling device, and accelerated cooling device are arranged in this order from the upstream side in the conveying direction, and the energy of the cooling water sprayed by the descaling device toward the surface of the thick steel plate A thick steel plate manufacturing facility, wherein the density E is 0.10 J / mm 2 or more. [2] The distance from the descaling device to the accelerated cooling device when the transport speed from the descaling device to the accelerated cooling device is V [m / s] and the steel plate temperature before cooling is T [K].
- L [m] satisfies the formula L ⁇ V ⁇ 5 ⁇ 10 ⁇ 9 ⁇ exp (25000 / T), the thick steel plate manufacturing facility according to [1].
- the spray distance H from the spray nozzle of the descaling device to the surface of the thick steel plate is 40 mm or more and 200 mm or less, according to any one of [1] to [3] Equipment for manufacturing thick steel plates.
- the accelerated cooling device includes a header that supplies cooling water to the upper surface of the thick steel plate, a cooling water injection nozzle that injects rod-shaped cooling water suspended from the header, and the thick steel plate and the header.
- a partition wall to be installed, and in the partition wall, a water supply port for inserting a lower end portion of the cooling water injection nozzle, and a drain port for discharging cooling water supplied to the upper surface of the thick steel plate to the partition wall And a plurality of the thick steel plate manufacturing equipment according to any one of [1] to [4].
- the energy density E is 0.
- a method for producing a thick steel sheet comprising a descaling step of injecting cooling water of 10 J / mm 2 or more.
- the time t [s] from the completion of the descaling process to the start of the accelerated cooling process satisfies an expression of t ⁇ 5 ⁇ 10 ⁇ 9 ⁇ exp (25000 / T).
- T Thick steel plate temperature (K) before cooling.
- uniforming the scale generated on the surface of the thick steel plate in the descaling step uniform cooling can be performed in the accelerated cooling step, and a thick steel plate having an excellent thick steel plate shape is manufactured. be able to.
- FIG. 1 is a schematic view showing an example of a thick plate rolling line.
- FIG. 2 is a graph showing the relationship between the energy density of the cooling water to be jetted and the scale thickness generated on the product surface of the thick steel plate in the descaling apparatus.
- FIG. 3 is a diagram illustrating the relationship between the spray distance of the spray nozzle and the fluid velocity in the descaling apparatus.
- FIG. 4 is a side view of a cooling device according to an embodiment of the present invention.
- FIG. 5 is a side view of another cooling device according to an embodiment of the present invention.
- FIG. 6 is a diagram illustrating an example of the nozzle arrangement of the partition wall according to the embodiment of the present invention.
- FIG. 7 is a diagram for explaining the flow of the cooling drainage on the partition wall.
- FIG. 1 is a schematic view showing an example of a thick plate rolling line.
- FIG. 2 is a graph showing the relationship between the energy density of the cooling water to be jetted and the scale thickness generated on the product surface of the thick
- FIG. 8 is a diagram for explaining another flow of the cooling drainage on the partition wall.
- FIG. 9 is a view for explaining a temperature distribution in the width direction of a thick steel plate of a conventional example.
- FIG. 10 is a diagram illustrating the flow of cooling water in the acceleration cooling device.
- FIG. 11 is a diagram for explaining non-interference with cooling drainage on the partition wall in the acceleration cooling device.
- FIG. 1 is a schematic view showing an example of a thick plate rolling line used for carrying out the present invention.
- the slab extracted from the heating furnace 2 is subjected to rough rolling and finish rolling by a rolling mill 3 and rolled into a thick steel plate 1 having a predetermined plate thickness.
- the thick steel plate 1 is conveyed to the accelerated cooling device 6 online.
- it is suitable for the shape of the thick steel plate after cooling to perform the accelerated cooling after adjusting the shape of the thick steel plate through the first shape correction device 5.
- the thick steel plate is cooled to a predetermined temperature by the cooling water sprayed from the upper surface cooling facility and the lower surface cooling facility. Thereafter, the shape of the thick steel plate is corrected by the second shape correction device 7 as necessary.
- the descaling device 4 is a device that removes the scale generated on the surface of the thick steel plate 1.
- a plurality of injection nozzles are directed to the surface of the thick steel plate 1 after the shape correction of the strain generated in the thick steel plate 1 by the first shape straightening device 5, and cooling water is supplied from these nozzles. Spray.
- the present inventors have obtained the knowledge that the scale peeling is not sufficiently performed by the descaling condition, and rather the scale unevenness is promoted. And when earnestly examining the conditions under which scale peeling is sufficiently performed, when descaling is performed after shape correction, as shown in FIG. 2, it is sprayed from the spray nozzle of the descaling device 4 onto the surface of the thick steel plate 1. It has been clarified that when the energy density E of the cooling water is set to 0.10 J / mm 2 or more, the scale thickness to be regenerated thereafter becomes uniform at 5 ⁇ m or less. This is considered to be because the scale was once completely peeled off uniformly by descaling, and then the scale was thinly and uniformly regenerated.
- the scale generated on the surface of the thick steel plate 1 is removed by performing descaling with the energy density E of the cooling water set to 0.10 J / mm 2 or more. Thereafter, the accelerated cooling device 6 performs accelerated cooling of the thick steel plate 1.
- the scale thickness of the thick steel plate becomes thin and uniform by descaling, it can be cooled uniformly with almost no surface temperature variation in the position in the width direction of the thick steel plate when passing through the accelerated cooling device. It becomes a thick steel plate excellent in steel plate shape.
- the reason for this is as follows.
- the scale may be partially peeled off. Then, since the scale is not peeled off uniformly, the scale thickness distribution varies about 10-50 ⁇ m. In this case, it is difficult to uniformly cool the thick steel plate in the subsequent accelerated cooling device. That is, if a thick steel plate having a variation in scale thickness distribution in a conventional rolling facility is accelerated and cooled, the variation in the surface temperature at the position in the width direction is large and cannot be uniformly cooled. As a result, the thick steel plate shape is affected.
- the thick steel plate 1 is cooled by the accelerated cooling device 6. At this time, there is almost no variation in the surface temperature at the position in the width direction, and cooling can be performed uniformly. As a result, the thick steel plate 1 having an excellent thick steel plate shape can be manufactured. In the case of the present invention, even when the collision pressure is low, the same descaling as in the case of using a high collision pressure can be achieved by adjusting the conveyance speed.
- the energy density E (J / mm 2 ) of the cooling water sprayed onto the thick steel plate is an index of the ability to remove the scale by descaling and is defined as the following equation (1).
- E Q / (d ⁇ W ) ⁇ ⁇ v 2/2 ⁇ t ...
- Q Descaling water injection flow rate [m 3 / s]
- d Flat nozzle spray injection thickness [mm]
- W Flat nozzle spray injection width [mm]
- the present inventors adopted water density ⁇ injection pressure ⁇ collision time as a simple definition of the energy density E (J / mm 2 ) of cooling water injected into the thick steel plate. I found out that I should do it.
- the water density (m 3 / mm 2 ⁇ min) is a value calculated by “cooling water injection flow rate ⁇ cooling water collision area”.
- the collision time (s) is a value calculated by “cooling water collision thickness ⁇ thick steel plate conveyance speed”. The relationship between the energy density of the cooling water calculated by this simple definition and the scale thickness generated on the product surface is the same as in FIG.
- the scale thickness decreases as the energy density of the cooling water increases. That is, when the energy density E is smaller than 0.10 J / mm 2 , the thickness variation of the thick steel plate becomes large, and it is not possible to cool uniformly, and it is not possible to manufacture a thick steel plate having an excellent thick steel plate shape. There is. On the other hand, if the energy density E is 0.10 J / mm 2 or more, such a failure is avoided. Therefore, in the present invention, the energy density E of the cooling water is 0.10 J / mm 2 or more, and more preferably 0.15 J / mm 2 or more.
- the present inventors investigated the fluid velocity v of the cooling water injected from the injection nozzle of the descaling device 4. As a result, it was found that the relationship between the fluid velocity v and the ejection distance is as shown in FIG.
- the fluid velocity on the vertical axis was obtained by solving an equation of motion considering buoyancy and air resistance. Until the cooling water reaches the thick steel plate, the fluid velocity v of the cooling water is decelerated as compared with the time of jetting. For this reason, the smaller the injection distance, the larger the fluid velocity v at the time of the collision with the thick steel plate, and a larger energy density can be obtained. From FIG. 3, since the attenuation increases particularly when the injection distance H exceeds 200 mm, the injection distance H is preferably 200 mm or less.
- the injection distance is shorter, the injection pressure and the injection flow rate for obtaining a predetermined energy density can be reduced, so that the pumping capacity of the descaling device 4 can be reduced.
- the thick steel plate 1 that has been straightened by the first straightening device 5 moves into the descaling device 4. Can be brought closer to the surface of the thick steel plate 1.
- the lower limit value of the injection distance is preferably 40 mm or more.
- the injection distance H is 40 mm or more and 200 mm or less.
- the injection pressure of the cooling water is preferably 10 MPa or more, more preferably 15 MPa or more. This is effective because the energy density of the cooling water can be set to 0.10 J / mm 2 or more without excessively reducing the conveyance speed.
- the upper limit value of the injection pressure is not particularly limited. However, when the injection pressure is increased, the energy consumed by the pump for supplying high-pressure water becomes enormous, and therefore the injection pressure is preferably 50 MPa or less.
- the following formula (3) can be derived based on the above formula (2). That is, when the time t [s] from the end of descaling of the thick steel plate 1 by the descaling device 4 to the start of cooling the thick steel plate 1 by the accelerated cooling device 6 satisfies the following equation (3): Cooling by the acceleration cooling device 6 is stabilized. t ⁇ 5 ⁇ 10 ⁇ 9 ⁇ exp (25000 / T) (3) However, T: Thick steel plate temperature [K] before cooling.
- the following formula (4) can be derived based on the above formula (2). That is, when the time t [s] from the end of removal of the scale of the thick steel plate 1 by the descaling device 4 to the start of the cooling of the thick steel plate 1 by the accelerated cooling device 6 satisfies the following equation (4): The cooling by the acceleration cooling device 6 becomes more stable. t ⁇ 2.2 ⁇ 10 ⁇ 9 ⁇ exp (25000 / T) (4) Furthermore, when the scale thickness is 5 ⁇ m or less, the following formula (5) can be derived based on the above formula (2).
- the distance L from the descaling device 4 to the acceleration cooling device 6 is 12 to 107 m, cooling is stable, 5 to 47 m is more stable, and 1.3 to 12 m is very stable.
- most of the thick steel plates 1 that require controlled cooling are conditions in which cooling is very stable at the transport speed V, considering that the transport speed V is 0.5 m / s or more. More preferably, the distance L is 2.5 m or less.
- the distance L from the descaling device 4 to the accelerated cooling device 6 is preferably 12 m or less, more preferably 5 m or less, Preferably, cooling can be stabilized by setting it to 2.5 m or less.
- the accelerated cooling device 6 of the present invention includes an upper header 11 that supplies cooling water to the upper surface of the thick steel plate 1, and cooling water that injects rod-shaped cooling water suspended from the upper header 11.
- the injection nozzle 13 includes a partition wall 15 installed between the thick steel plate 1 and the upper header 11, and the partition wall 15 includes a water supply port 16 for inserting a lower end portion of the cooling water injection nozzle 13, and a thick steel plate. It is preferable that a large number of drain ports 17 for draining the cooling water supplied to the upper surface of 1 onto the partition wall 15 are provided.
- the upper surface cooling facility includes an upper header 11 for supplying cooling water to the upper surface of the thick steel plate 1, a cooling water injection nozzle 13 suspended from the upper header 11, and the upper header 11 and the thick steel plate 1. And a partition wall 15 having a large number of through-holes (water supply port 16 and drain port 17) installed horizontally in the width direction of the thick steel plate.
- the cooling water injection nozzle 13 is composed of a circular tube nozzle 13 for injecting rod-shaped cooling water, and its tip is inserted into a through-hole (water supply port 16) provided in the partition wall 15, from the lower end of the partition wall 15. It is installed to be on the top.
- the cooling water injection nozzle 13 may be inserted into the upper header 11 so that the upper end of the cooling water injection nozzle 13 protrudes into the upper header 11 in order to prevent the foreign matter at the bottom in the upper header 11 from being sucked and clogged. preferable.
- the rod-shaped cooling water in the present invention is cooling water injected in a state of being pressurized to some extent from a circular (including elliptical or polygonal) nozzle outlet, and is cooled from the nozzle outlet.
- the water injection speed is 6 m / s or more, preferably 8 m / s or more, and the water flow jetted from the nozzle outlet has a continuous circular shape, and the water flow has a continuous and straight flow.
- it is different from a free fall flow from a circular tube laminar nozzle or a liquid ejected in a droplet state such as a spray.
- the reason why the tip of the cooling water spray nozzle 13 is inserted into the through hole and is located above the lower end of the partition wall 15 is that the partition wall 15 is inserted even when a thick steel plate whose tip is warped upward enters. This is to prevent the cooling water injection nozzle 13 from being damaged. As a result, the cooling water injection nozzle 13 can be cooled for a long period of time in a good state, so that it is possible to prevent the occurrence of uneven temperature in the thick steel plate without repairing the equipment.
- the tip of the circular tube nozzle 13 since the tip of the circular tube nozzle 13 is inserted into the through hole, as shown in FIG. 11, it does not interfere with the flow in the width direction of the drained water 19 indicated by the dotted arrow flowing through the upper surface of the partition wall 15. Therefore, the cooling water jetted from the cooling water jet nozzle 13 can reach the upper surface of the thick steel plate equally regardless of the position in the width direction, and uniform cooling in the width direction can be performed.
- a large number of through-holes having a diameter of 10 mm are opened in a grid pattern at a pitch of 80 mm in the thick steel plate width direction and 80 mm in the transport direction.
- a cooling water injection nozzle 13 having an outer diameter of 8 mm, an inner diameter of 3 mm, and a length of 140 mm is inserted into the water supply port 16.
- the cooling water injection nozzles 13 are arranged in a staggered pattern, and the through holes through which the cooling water injection nozzles 13 do not pass serve as cooling water drains 17.
- the large number of through holes provided in the partition wall 15 of the accelerated cooling device of the present invention are composed of the substantially same number of water supply ports 16 and drain ports 17, and each share a role and function.
- the total cross-sectional area of the drain port 17 is sufficiently larger than the total cross-sectional area of the inner diameter of the circular pipe nozzle 13 of the cooling water injection nozzle 13, and about 11 times the total cross-sectional area of the inner diameter of the circular pipe nozzle 13 is ensured.
- the cooling water supplied to the upper surface of the thick steel plate is filled between the thick steel plate surface and the partition wall 15, guided to the upper side of the partition wall 15 through the drain port 17, and quickly discharged.
- the FIG. 7 is a front view for explaining the flow of cooling drainage near the end in the width direction of the thick steel plate on the partition wall.
- the drainage direction of the drainage port 17 is upward opposite to the cooling water injection direction, and the cooling drainage drained upward from the partition wall 15 changes the direction outward in the thick steel plate width direction, between the upper header 11 and the partition wall 15. It drains through the drainage channel.
- the drain port 17 is inclined in the thick steel plate width direction, and the slanted direction is directed outward in the width direction so that the drain direction is directed outward in the thick steel plate width direction.
- the plate width is about 2 m at most, the influence is limited. However, the influence cannot be ignored especially in the case of a thick plate having a plate width of 3 m or more. Accordingly, the cooling at the end in the width direction of the thick steel plate is weakened, and the temperature distribution in the width direction of the thick steel plate in this case becomes a non-uniform temperature distribution.
- the water supply port 16 and the water discharge port 17 are provided separately and share the roles of water supply and water discharge. And smoothly flows above the partition wall 15. Accordingly, since the drainage after cooling is quickly removed from the upper surface of the thick steel plate, the cooling water supplied subsequently can easily penetrate the staying water film, and a sufficient cooling capacity can be obtained.
- the temperature distribution in the width direction of the thick steel plate is a uniform temperature distribution, and a uniform temperature distribution in the width direction can be obtained.
- the cooling water is discharged quickly. This can be realized, for example, by making holes larger than the outer diameter of the circular tube nozzle 13 in the partition wall 15 and making the number of drain ports equal to or greater than the number of water supply ports.
- the ratio of the total cross-sectional area of the drain outlet and the total cross-sectional area of the inner diameter of the circular tube nozzle 13 is preferably in the range of 1.5 to 20.
- the gap between the outer peripheral surface of the circular tube nozzle 13 inserted in the water supply port 16 of the partition wall 15 and the inner surface of the water supply port 16 be 3 mm or less. If this gap is large, the cooling drainage discharged to the upper surface of the partition wall 15 is drawn into the gap between the outer peripheral surface of the circular pipe nozzle 13 of the water supply port 16 due to the influence of the accompanying flow of the cooling water injected from the circular pipe nozzle 13. As a result, the steel sheet is again supplied onto the thick steel plate, resulting in poor cooling efficiency. In order to prevent this, it is more preferable that the outer diameter of the circular tube nozzle 13 is substantially the same as the size of the water supply port 16. However, in consideration of machining accuracy and mounting errors, a gap of up to 3 mm that has substantially little influence is allowed. More preferably, it is 2 mm or less.
- the nozzle inner diameter is preferably 3 to 8 mm. If it is smaller than 3 mm, the bundle of water sprayed from the nozzle becomes thin and the momentum becomes weak. On the other hand, when the nozzle diameter exceeds 8 mm, the flow rate becomes slow, and the force penetrating the staying water film becomes weak.
- the length of the circular tube nozzle 13 is preferably 120 to 240 mm.
- the length of the circular tube nozzle 13 here means the length from the inlet at the upper end of the nozzle that penetrates into the header to some extent to the lower end of the nozzle inserted into the water supply port of the partition wall.
- the distance between the lower surface of the header and the upper surface of the partition wall becomes too short (for example, the header thickness is 20 mm, the protrusion amount of the nozzle upper end into the header is 20 mm, and the insertion amount of the nozzle lower end into the partition wall is 10 mm. Therefore, the drainage space above the partition wall becomes small, and the cooling drainage cannot be discharged smoothly.
- the pressure loss of the circular tube nozzle 13 becomes large, and the force penetrating the staying water film becomes weak.
- the jet speed of cooling water from the nozzle is required to be 6 m / s or more, preferably 8 m / s or more. This is because if it is less than 6 m / s, the force of the cooling water penetrating through the staying water film becomes extremely weak. If it is 8 m / s or more, a larger cooling capacity can be secured, which is preferable.
- the distance from the lower end of the cooling water jet nozzle 13 for cooling the upper surface to the surface of the thick steel plate 1 is preferably 30 to 120 mm. If it is less than 30 mm, the frequency with which the thick steel plate 1 collides with the partition wall 15 becomes extremely high, and equipment maintenance becomes difficult. If it exceeds 120 mm, the force through which the cooling water penetrates the staying water film becomes extremely weak.
- draining rolls 20 When cooling the upper surface of the thick steel plate, it is preferable to install draining rolls 20 before and after the upper header 11 so that the cooling water does not spread in the longitudinal direction of the thick steel plate. Thereby, the cooling zone length becomes constant and the temperature control becomes easy.
- the cooling drainage since the flow of the cooling water in the direction of transporting the thick steel plate is blocked by the draining roll 20, the cooling drainage flows outward in the width direction of the thick steel plate. However, the cooling water tends to stay in the vicinity of the draining roll 20.
- the cooling water jet nozzles in the uppermost stream side row in the thickness plate conveying direction are 15 to 15 upstream in the thickness plate conveying direction. It is preferable that the cooling water jet nozzles at the most downstream side in the thick steel plate conveyance direction are inclined 15 to 60 degrees in the downstream direction in the thick steel plate conveyance direction.
- the distance between the lower surface of the upper header 11 and the upper surface of the partition wall 15 is such that the cross-sectional area in the width direction of the thick steel plate in the space surrounded by the lower surface of the header and the upper surface of the partition wall is 1.5 times the total cross-sectional area of the cooling water spray nozzle inner diameter. For example, it is about 100 mm or more.
- the cross-sectional area of the thick steel plate in the width direction is not 1.5 times or more than the total cross-sectional area of the cooling water jet nozzle inner diameter, the cooling drainage discharged from the drain port 17 provided on the partition wall to the top surface of the partition wall 15 is smoothly thick. It cannot be discharged in the width direction of the steel sheet.
- the range of the water density that exhibits the most effect is 1.5 m 3 / m 2 ⁇ min or more.
- the water density is lower than this, the accumulated water film does not become so thick, and even if a known technique for cooling the thick steel plate by free-falling the rod-shaped cooling water is applied, the temperature unevenness in the width direction does not become so large. In some cases.
- the water density is higher than 4.0 m 3 / m 2 ⁇ min, it is effective to use the technique of the present invention.
- 1.5 to 4.0 m 3 / m 2 ⁇ min is the most practical water density.
- the application of the cooling technique of the present invention is particularly effective when a draining roll is arranged before and after the cooling header.
- the header is relatively long in the longitudinal direction (when it is about 2 to 4 m), and it is applied to cooling equipment that sprays water spray for purging before and after the header to prevent water leakage to the non-water cooling zone. Is also possible.
- the cooling device on the lower surface side of the thick steel plate is not particularly limited.
- an example of the cooled header 12 including the circular tube nozzle 14 similar to the cooling device on the upper surface side is shown.
- the injected cooling water naturally falls after colliding with the thick steel plate. Therefore, there is no need for the partition wall 15 for discharging cooling drainage like the upper surface side cooling in the width direction of the thick steel plate.
- the manufacturing equipment of the thick steel plate of the present invention sets the energy density E sprayed on the surface of the thick steel plate 1 from the spray nozzle of the descaling device 4 to 0.10 J / mm 2 or more. 1 can be made uniform, and the accelerated cooling device 6 can achieve uniform cooling. As a result, the thick steel plate 1 having an excellent thick steel plate shape can be manufactured.
- the spray nozzle of the descaling device 4 can be brought close to the surface of the thick steel plate 1.
- the spray distance H (the surface distance between the spray nozzle of the descaling device 4 and the thick steel plate 1) is set to 40 mm or more and 200 mm or less, the descaling ability is improved.
- the injection pressure and the injection flow rate for obtaining the predetermined energy density E may be small, the pumping capacity of the descaling device 4 can be reduced.
- the distance L from the descaling device 4 to the acceleration cooling device 6 satisfies L ⁇ V ⁇ 5 ⁇ 10 ⁇ 9 ⁇ exp (25000 / T), thereby stabilizing the cooling of the thick steel plate 1 by the acceleration cooling device 6. Can be made.
- the accelerated cooling device 6 of the present invention cools the upper surface of the thick steel plate 1 by the cooling water supplied from the upper cooling water injection nozzle 13 through the water supply port 16 and has a high temperature. It becomes drainage and flows in the width direction of the steel plate 1 from above the partition 15 using the drain port 17 through which the upper cooling water injection nozzle 13 is not inserted as a drainage channel, and the drainage after cooling is quickly removed from the steel plate 1. Therefore, the cooling water flowing from the upper cooling water injection nozzle 13 through the water supply port 16 sequentially comes into contact with the thick steel plate 1 to obtain sufficient cooling capacity in the width direction. Can do.
- the temperature unevenness in the width direction of the thick steel plate subjected to accelerated cooling without performing descaling as in the present invention was about 40 ° C.
- the descaling device 4 of the present invention after performing descaling at an energy density of cooling water of 0.10 J / mm 2 or more, temperature unevenness in the width direction of the thick steel plate subjected to accelerated cooling. It was found that the temperature decreased to about 10 ° C.
- the temperature unevenness in the width direction of the thick steel plate subjected to acceleration cooling using the acceleration cooling device 6 shown in FIG. 4 is reduced to about 4 ° C. It was.
- the temperature unevenness of the thick steel plate was measured by measuring the steel plate surface temperature distribution after accelerated cooling with a scanning thermometer, and the temperature unevenness in the width direction was calculated from the measurement result.
- the distortion generated during rolling is corrected by the first shape correction device 5, the descaling device 4 performs the descaling of the thick steel plate 1, and the cooling controllability is stabilized.
- the thick steel plate 1 that is corrected by the second shape correcting device 7 originally has high flatness and the temperature of the thick steel plate 1 is also uniform. Therefore, it is not necessary to make the correction reaction force of the second shape correcting device 7 so high.
- the distance between the acceleration cooling device 6 and the second shape correction device 7 is preferably longer than the maximum length of the thick steel plate 1 manufactured on the rolling production line.
- the steel plate 1 having a thickness of 30 mm and a width of 3500 mm rolled by the rolling mill 3 was subjected to controlled cooling from 820 ° C. to 420 ° C. after passing through the first shape correction device 5 and the descaling device 4.
- the conditions under which the cooling is stabilized are calculated from the above-described equations (3), (4), and (5).
- the accelerated cooling device 6 uses the thick steel plate.
- the time t until the cooling of 1 is started is preferably 42 s or less, more preferably 19 s or less, and even more preferably 5 s or less.
- the surface distance between the nozzle and the thick steel plate 1 is 130 mm, the nozzle injection angle is 32 °, the nozzle attack angle is 15 °, and one row is arranged in the width direction so that the injection regions of adjacent nozzles are wrapped to some extent.
- the spray spray thickness is 3 mm and the spray spray width is 77 mm.
- the energy density of the cooling water is a value defined by the above-mentioned water amount density ⁇ injection pressure ⁇ collision time.
- the collision time (s) is the time during which descaling water is sprayed on the surface of the thick steel plate, and is obtained by dividing the spray spray thickness by the transport speed.
- the accelerated cooling device 6 is provided with a flow path that allows the cooling water supplied to the upper surface of the thick steel plate to flow above the partition as shown in FIG. 4 and further drains from the side of the thick steel plate in the width direction as shown in FIG.
- the equipment In the partition wall, holes with a diameter of 12 mm are drilled like a grid, and as shown in FIG. 6, the upper cooling water injection nozzles are inserted into the water supply ports arranged in a staggered pattern, and the remaining holes are used as drainage ports. Using.
- the distance between the lower surface of the upper header and the upper surface of the partition wall was 100 mm.
- the upper cooling water spray nozzle of the accelerated cooling device 6 had an inner diameter of 5 mm, an outer diameter of 9 mm, and a length of 170 mm, and its upper end protruded into the header. Moreover, the injection speed of the rod-shaped cooling water was 8.9 m / s.
- the nozzle pitch in the thick steel plate width direction was 50 mm, and 10 rows of nozzles were arranged in the longitudinal direction in a zone having a distance between table rollers of 1 m.
- the water density on the upper surface was 2.1 m 3 / m 2 ⁇ min.
- the lower end of the nozzle for cooling the upper surface was set so as to be in the middle position between the upper and lower surfaces of the partition wall having a thickness of 25 mm, and the distance to the surface of the thick steel plate was 80 mm.
- the cooling facility similar to the top surface cooling facility is used except that no partition wall is provided as shown in FIG. did.
- Thick steel plate shape was evaluated by additional correction rate (%). Specifically, if the warpage of the total length of the steel sheet and / or the warpage of the full width of the steel sheet is within the standard value defined in the product standard corresponding to the steel sheet, it passes, and if it exceeds the standard value, additional correction is performed. The material was judged as an implementation material, and the additional correction rate was calculated as (number of additional correction implementation materials) / (total number of target materials) ⁇ 100.
- Example 5 of the present invention gave good results by setting the energy density within the range of the present invention without requiring high collision pressure (1.0 MPa) as in Patent Document 1 and Patent Document 2. .
- the energy density was 0.08 J / mm 2
- the additional correction rate was 70%.
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Abstract
Description
[1]熱間圧延機、形状矯正装置、デスケーリング装置および加速冷却装置をこの順序で搬送方向上流側から配置し、前記デスケーリング装置が厚鋼板の表面に向けて噴射する冷却水の持つエネルギー密度Eを0.10J/mm2以上にすることを特徴とする厚鋼板の製造設備。
[2]前記デスケーリング装置から前記加速冷却装置までの搬送速度をV[m/s]、冷却前の厚鋼板温度をT[K]とすると、前記デスケーリング装置から前記加速冷却装置までの距離L[m]は、L≦V×5×10-9×exp(25000/T)の式を満たしていることを特徴とする[1]に記載の厚鋼板の製造設備。
[3]前記デスケーリング装置から前記加速冷却装置までの距離Lが12m以下となるように各装置を配置することを特徴とする[2]に記載の厚鋼板の製造設備。
[4]前記デスケーリング装置の噴射ノズルから前記厚鋼板の表面までの噴射距離Hを、40mm以上で200mm以下とすることを特徴とする[1]乃至[3]の何れか1項に記載の厚鋼板の製造設備。
[5]前記加速冷却装置が、前記厚鋼板の上面に冷却水を供給するヘッダと、該ヘッダから懸垂した棒状冷却水を噴射する冷却水噴射ノズルと、前記厚鋼板と前記ヘッダとの間に設置される隔壁とを備えるとともに、前記隔壁には、前記冷却水噴射ノズルの下端部を内挿する給水口と、前記厚鋼板の上面に供給された冷却水を前記隔壁上へ排水する排水口とが、多数設けられていることを特徴とする[1]乃至[4]の何れか1項に記載の厚鋼板の製造設備。
[6]熱間圧延工程、熱間矯正工程および加速冷却工程の順番で厚鋼板を製造する方法において、前記熱間矯正工程および冷却工程の間に、厚鋼板の表面にエネルギー密度Eが0.10J/mm2以上の冷却水を噴射するデスケーリング工程を有することを特徴とする厚鋼板の製造方法。
[7]前記デスケーリング工程の完了から前記加速冷却工程の開始までの時間t[s]は、t≦5×10-9×exp(25000/T)の式を満たしていることを特徴とする[6]に記載の厚鋼板の製造方法。ただし、T:冷却前の厚鋼板温度(K)である。 The gist of the present invention is as follows.
[1] Hot rolling mill, shape correction device, descaling device, and accelerated cooling device are arranged in this order from the upstream side in the conveying direction, and the energy of the cooling water sprayed by the descaling device toward the surface of the thick steel plate A thick steel plate manufacturing facility, wherein the density E is 0.10 J / mm 2 or more.
[2] The distance from the descaling device to the accelerated cooling device when the transport speed from the descaling device to the accelerated cooling device is V [m / s] and the steel plate temperature before cooling is T [K]. L [m] satisfies the formula L ≦ V × 5 × 10 −9 × exp (25000 / T), the thick steel plate manufacturing facility according to [1].
[3] The equipment for manufacturing a thick steel plate according to [2], wherein each device is arranged such that a distance L from the descaling device to the accelerated cooling device is 12 m or less.
[4] The spray distance H from the spray nozzle of the descaling device to the surface of the thick steel plate is 40 mm or more and 200 mm or less, according to any one of [1] to [3] Equipment for manufacturing thick steel plates.
[5] The accelerated cooling device includes a header that supplies cooling water to the upper surface of the thick steel plate, a cooling water injection nozzle that injects rod-shaped cooling water suspended from the header, and the thick steel plate and the header. A partition wall to be installed, and in the partition wall, a water supply port for inserting a lower end portion of the cooling water injection nozzle, and a drain port for discharging cooling water supplied to the upper surface of the thick steel plate to the partition wall And a plurality of the thick steel plate manufacturing equipment according to any one of [1] to [4].
[6] In the method of manufacturing a thick steel plate in the order of the hot rolling step, the hot straightening step, and the accelerated cooling step, the energy density E is 0. 0 on the surface of the thick steel plate during the hot straightening step and the cooling step. A method for producing a thick steel sheet, comprising a descaling step of injecting cooling water of 10 J / mm 2 or more.
[7] The time t [s] from the completion of the descaling process to the start of the accelerated cooling process satisfies an expression of t ≦ 5 × 10 −9 × exp (25000 / T). The manufacturing method of the thick steel plate as described in [6]. However, T: Thick steel plate temperature (K) before cooling.
E=Q/(d×W)×ρv2/2×t…(1)
ただし、Q:デスケーリング水の噴射流量[m3/s]、d:フラットノズルのスプレー噴射厚み[mm]、W:フラットノズルのスプレー噴射幅[mm]、流体密度ρ[kg/m3]、厚鋼板衝突時の流体速度v[m/s]、衝突時間t[s](t=d/1000/V、搬送速度V[m/s])である。 Here, the energy density E (J / mm 2 ) of the cooling water sprayed onto the thick steel plate is an index of the ability to remove the scale by descaling and is defined as the following equation (1).
E = Q / (d × W ) ×
However, Q: Descaling water injection flow rate [m 3 / s], d: Flat nozzle spray injection thickness [mm], W: Flat nozzle spray injection width [mm], Fluid density ρ [kg / m 3 ] , Fluid velocity v [m / s] at the time of collision of thick steel plate, collision time t [s] (t = d / 1000 / V, transport speed V [m / s]).
ξ2=a×exp(-Q/RT)×t…(2)
ただし、ξ:スケール厚み、a:定数、Q:活性化エネルギー、R:定数、T:冷却前の厚鋼板温度[K]、t:時間である。 By the way, regarding the scale of the surface of the
ξ 2 = a × exp (−Q / RT) × t (2)
Where ξ: scale thickness, a: constant, Q: activation energy, R: constant, T: thick steel plate temperature [K] before cooling, t: time.
t≦5×10-9×exp(25000/T)…(3)
ただし、T:冷却前の厚鋼板温度[K]である。 When the scale thickness is 15 μm or less, the following formula (3) can be derived based on the above formula (2). That is, when the time t [s] from the end of descaling of the
t ≦ 5 × 10 −9 × exp (25000 / T) (3)
However, T: Thick steel plate temperature [K] before cooling.
t≦2.2×10-9×exp(25000/T)…(4)
さらに、スケール厚みが5μm以下の場合、上記(2)式に基づき、下記式(5)を導出することができる。すなわち、デスケーリング装置4による厚鋼板1のスケール除去終了後から、加速冷却装置6で厚鋼板1の冷却を開始するまでの時間t[s]が、次の(5)式を満たす場合に、加速冷却装置6による冷却が非常に安定する。
t≦5.6×10-10×exp(25000/T)…(5)
一方、デスケーリング装置4の出側から加速冷却装置6の入り側までの距離Lは、厚鋼板1の搬送速度Vと、時間t(デスケーリング装置4の工程終了から加速冷却装置6の工程開始までの時間)とに対して次の(6)式を満たすように設定する。
L≦V×t…(6)
ただし、L:デスケーリング装置4から加速冷却装置6までの距離(m)、V:厚鋼板1の搬送速度(m/s)、t:時間(s)
そして、上記(6)式と上記(3)式とから、次の(7)式を導出することができる。本発明において、(7)式を満足することがより好ましい。
L≦V×5×10-9×exp(25000/T)…(7)
また、上記(6)式と上記(4)式とから、次の(8)式を導出することができる。本発明において、(8)式を満足することがさらに好ましい。
L≦V×2.2×10-9×exp(25000/T)…(8)
さらに、上記(6)式と上記(5)式とから、次の(9)式を導出することができる。本発明において、(9)式を満足することが好ましい。
L≦V×5.6×10-10×exp(25000/T)…(9)
上記の(7)~(9)式から、例えば加速冷却装置6による冷却前の厚鋼板1の温度を820℃とし、厚鋼板1の搬送速度を0.28~2.50m/sとすると、デスケーリング装置4から加速冷却装置6までの距離Lは12m以上107m以下で冷却が安定し、5m以上47m以下で冷却がより安定し、1.3m以上12m以下で冷却が非常に安定する。 When the scale thickness is 10 μm or less, the following formula (4) can be derived based on the above formula (2). That is, when the time t [s] from the end of removal of the scale of the
t ≦ 2.2 × 10 −9 × exp (25000 / T) (4)
Furthermore, when the scale thickness is 5 μm or less, the following formula (5) can be derived based on the above formula (2). That is, when the time t [s] from the end of descaling of the
t ≦ 5.6 × 10 −10 × exp (25000 / T) (5)
On the other hand, the distance L from the exit side of the descaling device 4 to the entrance side of the
L ≦ V × t (6)
However, L: Distance (m) from descaling device 4 to
Then, the following equation (7) can be derived from the above equation (6) and the above equation (3). In the present invention, it is more preferable to satisfy the expression (7).
L ≦ V × 5 × 10 −9 × exp (25000 / T) (7)
Further, the following equation (8) can be derived from the above equation (6) and the above equation (4). In the present invention, it is more preferable to satisfy the formula (8).
L ≦ V × 2.2 × 10 −9 × exp (25000 / T) (8)
Furthermore, the following equation (9) can be derived from the above equation (6) and the above equation (5). In the present invention, it is preferable that the expression (9) is satisfied.
L ≦ V × 5.6 × 10 −10 × exp (25000 / T) (9)
From the above formulas (7) to (9), for example, when the temperature of the
2 加熱炉
3 圧延機
4 デスケーリング装置
5 第1の形状矯正装置
6 加速冷却装置
7 第2の形状矯正装置
11 上ヘッダ
12 下ヘッダ
13 上冷却水噴射ノズル(円管ノズル)
14 下冷却水噴射ノズル(円管ノズル)
15 隔壁
16 給水口
17 排水口
18 噴射冷却水
19 排出水
20 水切ロール
21 水切ロール DESCRIPTION OF
14 Lower cooling water injection nozzle (circular tube nozzle)
15
Claims (7)
- 熱間圧延機、形状矯正装置、デスケーリング装置および加速冷却装置をこの順序で搬送方向上流側から配置し、前記デスケーリング装置が厚鋼板の表面に向けて噴射する冷却水の持つエネルギー密度Eを0.10J/mm2以上にすることを特徴とする厚鋼板の製造設備。 A hot rolling mill, a shape correction device, a descaling device, and an accelerated cooling device are arranged in this order from the upstream side in the conveying direction, and the energy density E of the cooling water that the descaling device injects toward the surface of the thick steel plate. A thick steel plate manufacturing facility characterized by 0.10 J / mm 2 or more.
- 前記デスケーリング装置から前記加速冷却装置までの搬送速度をV[m/s]、冷却前の厚鋼板温度をT[K]とすると、前記デスケーリング装置から前記加速冷却装置までの距離L[m]は、L≦V×5×10-9×exp(25000/T)の式を満たしていることを特徴とする請求項1に記載の厚鋼板の製造設備。 When the transport speed from the descaling device to the accelerated cooling device is V [m / s] and the steel plate temperature before cooling is T [K], the distance L [m from the descaling device to the accelerated cooling device ] Satisfies the formula of L ≦ V × 5 × 10 −9 × exp (25000 / T). The equipment for producing a thick steel plate according to claim 1.
- 前記デスケーリング装置から前記加速冷却装置までの距離Lが12m以下となるように各装置を配置することを特徴とする請求項2に記載の厚鋼板の製造設備。 The apparatus for manufacturing a thick steel plate according to claim 2, wherein each apparatus is arranged such that a distance L from the descaling apparatus to the accelerated cooling apparatus is 12 m or less.
- 前記デスケーリング装置の噴射ノズルから前記厚鋼板の表面までの噴射距離Hを、40mm以上200mm以下とすることを特徴とする請求項1乃至3の何れか1項に記載の厚鋼板の製造設備。 4. The equipment for manufacturing a thick steel plate according to claim 1, wherein a spray distance H from a spray nozzle of the descaling device to a surface of the thick steel plate is 40 mm or more and 200 mm or less.
- 前記加速冷却装置が、前記厚鋼板の上面に冷却水を供給するヘッダと、該ヘッダから懸垂した棒状冷却水を噴射する冷却水噴射ノズルと、前記厚鋼板と前記ヘッダとの間に設置される隔壁とを備えるとともに、前記隔壁には、前記冷却水噴射ノズルの下端部を内挿する給水口と、前記厚鋼板の上面に供給された冷却水を前記隔壁上へ排水する排水口とが、多数設けられていることを特徴とする請求項1乃至4の何れか1項に記載の厚鋼板の製造設備。 The accelerated cooling device is installed between a header for supplying cooling water to the upper surface of the thick steel plate, a cooling water injection nozzle for injecting rod-shaped cooling water suspended from the header, and the thick steel plate and the header. A partition wall, and the partition wall includes a water supply port for interpolating a lower end portion of the cooling water injection nozzle, and a drain port for draining the cooling water supplied to the upper surface of the thick steel plate to the partition wall. The manufacturing equipment for thick steel plates according to any one of claims 1 to 4, wherein a large number are provided.
- 熱間圧延工程、熱間矯正工程および加速冷却工程の順番で厚鋼板を製造する方法において、前記熱間矯正工程および冷却工程の間に、厚鋼板の表面にエネルギー密度Eが0.10J/mm2以上の冷却水を噴射するデスケーリング工程を有することを特徴とする厚鋼板の製造方法。 In the method of manufacturing a thick steel plate in the order of the hot rolling step, the hot straightening step and the accelerated cooling step, the energy density E is 0.10 J / mm on the surface of the thick steel plate during the hot straightening step and the cooling step. A method for producing a thick steel plate, comprising a descaling step of injecting two or more cooling waters.
- 前記デスケーリング工程の完了から前記加速冷却工程の開始までの時間t[s]は、t≦5×10-9×exp(25000/T)の式を満たしていることを特徴とする請求項6に記載の厚鋼板の製造方法。ただし、T:冷却前の厚鋼板温度(K)である。 The time t [s] from the completion of the descaling process to the start of the accelerated cooling process satisfies an expression of t ≦ 5 × 10 −9 × exp (25000 / T). The manufacturing method of the thick steel plate as described in 1 .. However, T: Thick steel plate temperature (K) before cooling.
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JP2016182622A (en) * | 2015-03-26 | 2016-10-20 | Jfeスチール株式会社 | Method and apparatus for removing excess scale on plug for piercing seamless steel tube material and method of using the plug |
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KR101742607B1 (en) | 2017-06-01 |
EP2979770A1 (en) | 2016-02-03 |
JP5962849B2 (en) | 2016-08-03 |
CN105102142B (en) | 2018-06-12 |
JPWO2014156086A1 (en) | 2017-02-16 |
TWI565541B (en) | 2017-01-11 |
KR20150138269A (en) | 2015-12-09 |
EP2979770B1 (en) | 2018-08-22 |
CN105102142A (en) | 2015-11-25 |
TW201501829A (en) | 2015-01-16 |
EP2979770A4 (en) | 2016-03-16 |
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