WO2010110473A1 - 厚鋼板の製造設備及び製造方法 - Google Patents
厚鋼板の製造設備及び製造方法 Download PDFInfo
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- WO2010110473A1 WO2010110473A1 PCT/JP2010/055497 JP2010055497W WO2010110473A1 WO 2010110473 A1 WO2010110473 A1 WO 2010110473A1 JP 2010055497 W JP2010055497 W JP 2010055497W WO 2010110473 A1 WO2010110473 A1 WO 2010110473A1
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- steel plate
- cooling
- thick steel
- descaling
- cooling water
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 title claims description 193
- 239000010959 steel Substances 0.000 title claims description 193
- 238000001816 cooling Methods 0.000 claims abstract description 171
- 239000000498 cooling water Substances 0.000 claims abstract description 76
- 239000007921 spray Substances 0.000 claims abstract description 30
- 238000005098 hot rolling Methods 0.000 claims abstract description 21
- 238000002347 injection Methods 0.000 claims description 89
- 239000007924 injection Substances 0.000 claims description 89
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 238000005192 partition Methods 0.000 claims description 32
- 238000012937 correction Methods 0.000 claims description 22
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 20
- 239000002826 coolant Substances 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 description 10
- 238000009826 distribution Methods 0.000 description 8
- 238000005507 spraying Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000003657 drainage water Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
- B21B39/08—Braking or tensioning arrangements
-
- 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
Definitions
- the present invention relates to a manufacturing facility (manufacturing facility) and a manufacturing method of a thick steel plate for performing hot rolling, hot leveling, and cooling of a steel plate.
- Patent Document 1 discloses a method of performing control cooling by performing finish rolling and hot straightening, performing descaling immediately before control cooling.
- Patent Documents 1 and 2 do not describe the pressure at the point of impact of cooling water in descaling, but the injection from the nozzles described in Patent Documents 1 and 2 In the collision pressure derived from the pressure (spraying pressure), the spraying distance (spraying distance), and the type of a general nozzle (nozzle), it is 0.08 to 1.00 MPa in Patent Document 1 (paragraph number in Patent Document 1 ( When an Everloy descaling nozzle DNX or DNH is used under the conditions of (0045) to (0046), since the injection angle is 23 °, the equations (1) and (1) described in paragraph numbers (0030) to (0031) of the present specification 2) From the equation, the collision pressure is 0.08 to 1.00 MPa.
- the level of material uniformity required for thick steel plates has become stricter, and the uneven cooling rate (cooling rate) at the time of controlled cooling caused by the unevenness of scale as described above is particularly significant in the material in the width direction of the thick steel plates.
- the negative impact on the uniformity of the product is no longer negligible. Therefore, the present invention has been made paying attention to the unsolved problems of the above conventional example, and by performing uniform descaling in the descaling process and achieving uniform cooling in the cooling process, the steel plate shape and machine It is an object of the present invention to provide a manufacturing equipment and a manufacturing method for a thick steel plate having excellent mechanical properties.
- a steel plate manufacturing facility includes a hot rolling mill, a shape leveling device, a descaling device, and a cooling equipment.
- a hot rolling mill Were arranged in this order from the upstream side in the transport direction, and the collision pressure P [MPa] of cooling water sprayed by the descaling device toward the surface of the thick steel plate was set to 1.5 MPa or more.
- the present inventors have intensively studied the force that causes removal of scale by high-pressure water, and when performing descaling after hot shape correction, as shown in FIG. It was clarified that when the collision pressure of the cooling water sprayed from the descaling device to the thick steel plate is 1.5 MPa or more, the scale thickness of the product decreases and becomes uniform.
- the scale thickness of the thick steel plate before passing through the cooling device becomes thin and uniform, so there is almost no variation in the surface temperature at the position in the width direction of the thick steel plate when passing through the cooling device.
- the steel plate can be cooled and becomes a thick steel plate excellent in steel plate shape and mechanical properties.
- the scale generated on the surface of the thick steel plate was removed with the descaling device, so the spray nozzle of the descaling device was corrected in shape. It becomes possible to approach the surface of the thick steel plate, and the descaling ability is improved. Or it becomes possible to set low the capability to inject the cooling water of the descaling device for obtaining a predetermined collision pressure.
- the manufacturing equipment of the thick steel plate according to the present invention has a transport speed of the thick steel plate from the descaling device to the cooling device as V [m / s], and a thick steel plate temperature before cooling as T [K].
- the distance L [m] from the descaling device to the cooling device preferably satisfies the formula L ⁇ V ⁇ 5 ⁇ 10 ⁇ 9 ⁇ exp (25000 / T). According to this invention, it becomes possible to stabilize the cooling of the thick steel plate by the cooling device.
- the manufacturing equipment of the thick steel plate which concerns on this invention arrange
- the cooling of the thick steel plate by the cooling device is very stable.
- the distance H from the injection nozzle of the said descaling apparatus to the surface of the said thick steel plate sets the manufacturing equipment of the thick steel plate which concerns on this invention to 40 mm or more and 140 mm or less. According to the present invention, it is possible to reduce the pumping pressure or pump capacity of the descaling device because the injection pressure, the injection flow rate, etc. of the descaling device for obtaining a predetermined collision pressure are small.
- the manufacturing equipment of the thick steel plate includes a header for supplying cooling water to the upper surface of the thick steel plate, and a rod-like cooling water suspended from the header.
- a cooling water injection nozzle for injecting water and a partitioning plate installed between the thick steel plate and the header, and a lower end portion of the cooling water injection nozzle is inserted into the partition plate.
- a plurality of water supply inlets and drain outlets for draining the cooling water supplied to the upper surface of the thick steel plate onto the partition plate are provided.
- the cooling water supplied from the cooling water injection nozzle through the water supply port cools the upper surface of the thick steel plate to become high-temperature drainage and flows from the drain port to the upper side of the partition plate. Since the waste water is quickly removed from the thick steel plate, a sufficient cooling performance (cooling performance) in the width direction of the cooling device can be obtained.
- the method for producing a thick steel plate according to the present invention is a method for producing a thick steel plate in the order of a hot rolling step, a hot straightening step, and a cooling step, and the thickness is between the hot straightening step and the cooling step.
- a descaling step of injecting cooling water having a collision pressure of 1.5 MPa or more onto the surface of the steel plate is provided.
- the scale thickness of the thick steel plate before the cooling step is thin and uniform, there is almost no variation in surface temperature at the position in the width direction of the thick steel plate when performing the cooling step. It is possible to cool, and it is possible to produce a thick steel plate excellent in steel plate shape and mechanical properties.
- the time t [s] from the completion of the descaling step to the start of the cooling step is t ⁇ It is preferable that the formula of 5 ⁇ 10 ⁇ 9 ⁇ exp (25000 / T) is satisfied. According to this invention, it becomes possible to stabilize the cooling of the thick steel plate by the cooling process.
- uniform descaling can be performed in the descaling process, and excellent cooling in the steel sheet shape and mechanical properties can be achieved by achieving uniform cooling in the cooling process.
- Thick steel plates can be manufactured.
- FIG. 1 the hot rolling facility according to the present embodiment, in order from the upstream side in the conveying direction of the thick steel plate 1, the heating furnace 2, the hot rolling mill 3, the first shape correction device 5, and the descaling device. 4.
- a cooling device 6 and a second shape correction device 7 are installed.
- a slab extracted from the heating furnace 2 is rolled into a thick steel plate 1 having a predetermined plate thickness by passing a hot rolling mill 3 a plurality of times, and the hot rolled steel plate 1 is a table roller ( A sheet roller (not shown) is conveyed from the upstream side (upstream side) toward the downstream (downstream side) first shape correction device 5.
- a hot rolling mill 3 may be constituted by a rough rolling mill or a finish rolling mill.
- the first shape straightening device 5 removes strain generated in the thick steel plate 1 during hot rolling, and the thick steel plate is provided by straightening rolls arranged in a staggered layout on the top and bottom.
- roller leveler type shape correcting device for pinching 1 is illustrated, the present invention is not limited thereto, and a skin-pass mill or a press machine may be used. Moreover, when the hot rolling mill 3 is constituted by a rough rolling mill and a finishing rolling mill, skin-pass rolling may be performed by the finishing rolling mill.
- the second shape correction device 7 is for removing the distortion generated in the thick steel plate 1 during cooling by the cooling device 6, but in the present invention, this shape correction device may not be used.
- the 2nd shape correction apparatus 7 uses the roller leveler system, it is not limited to this, You may use a skin pass rolling mill or a press apparatus.
- the cooling device 6 is a device for controlling the structure of the thick steel plate 1 to obtain a desired material by controlling and cooling the hot thick steel plate 1 after hot rolling under a predetermined temperature condition. Any cooling device may be used as long as desired cooling conditions can be obtained, but a cooling device capable of performing uniform cooling in the upper and lower surfaces, the longitudinal direction, and the width direction of the thick steel plate 1 is preferable. Therefore, in the present embodiment, the cooling device 6 shown in FIG. 2 having a high cooling capacity and particularly excellent cooling uniformity in the width direction is used.
- the cooling device 6 of the present embodiment includes an upper header 10 that supplies cooling water to the upper surface of the thick steel plate 1, and an upper portion that extends downward from the upper header 10 toward the thick steel plate 1. Cooling is performed on the cooling water spray nozzle 11, the partition plate 12 having a large number of through holes (holes) installed horizontally across the steel plate width direction between the upper header 10 and the steel plate 1, and the lower surface of the steel plate 1.
- the partition plate 12 has a large number of (multiple) through holes 18 formed in a grid pattern, and an upper cooling water jet is injected into a predetermined through hole 18.
- the nozzle 11 is inserted in a staggered manner, and the lower end opening of the through hole 18 through which the upper cooling water spray nozzle 11 is inserted is a water supply port 19.
- the lower end opening of the through hole 18 through which the upper cooling water injection nozzle 11 is not inserted is a drain port 20.
- the tip of the upper cooling water injection nozzle 11 is installed in the through hole 18 (water supply port 19) so as to be higher than the lower end of the partition plate 12. However, this is because the tip is warped upward.
- the dotted line in FIG. 3 is parallel to the conveyance direction of a steel plate, and the both ends of the steel plate width direction of the partition plate 12 are abbreviate
- FIG. 4 shows the side view of the one end of the thick steel plate seen from the conveyance direction of the steel plate.
- the cooling water supplied from the upper cooling water injection nozzle 11 through the water supply port 19 cools the upper surface of the thick steel plate 1 to become high temperature drainage, and the partition plate 12 through the drain port 20. It is designed to flow upward. Further, the cooling water supplied from the lower cooling water injection nozzle 15 cools the lower surface of the thick steel plate 1 and flows downward.
- the partition plate 12 is not provided, the cooling water supplied to the upper surface of the thick steel plate 1 flows in the width direction on the upper surface of the thick steel plate 1 and is drained.
- the cooling device 6 of the present embodiment is configured so that the drainage after cooling is quickly removed from the upper surface of the thick steel plate 1 to above the partition plate 12, so that it is ejected from the upper cooling water spray nozzle 11.
- the cooling water to be brought into contact with the thick steel plate 1 in sequence can provide sufficient cooling capacity.
- the cooling water supplied to the upper surface of the thick steel plate 1 becomes difficult to escape above the partition plate 12, and the upper surface of the thick steel plate 1 is separated from the upper surface. It flows between the plates 12 toward the plate width end, and the flow of this drainage hinders the cooling water from the upper cooling water injection nozzle 11 from reaching the upper surface of the thick steel plate 1, and the vicinity of the plate width end The cooling capacity is reduced, and uniform cooling cannot be performed in the width direction.
- the through holes 18 are provided to share the function between the water supply port 19 and the drainage port 20, so that the flow of cooling water and cooling drainage is smooth. is there.
- the cooling water ejected from the upper cooling water injection nozzle 11 is discharged from the upper cooling water injection nozzle 11 in the width direction above the partition plate 12.
- Uniform cooling in the width direction can be performed without interference, and a uniform temperature distribution in the width direction can be obtained as shown in FIG.
- the total opening area of the drain port 20 (hereinafter referred to as the total sectional area) is 1.5 times or more the total opening area of the upper cooling water injection nozzle 11 (hereinafter referred to as the total sectional area of the inner diameter). If there is, it is desirable because the cooling water is quickly discharged from the drain port 20. If this value is smaller than 1.5 times, the flow resistance of the drainage port becomes large, and the accumulated water becomes difficult to drain onto the partition plate, so that it flows between the upper surface of the thick steel plate and the partition plate toward the plate width end. In particular, the cooling capacity in the vicinity of the end portion of the plate width decreases.
- the ratio of the total cross-sectional area of the drain outlet 20 and the total cross-sectional area of the inner diameter of the upper cooling water injection nozzle 11 is preferably in the range of 1.5 to 20.
- the inner diameter and length of the upper cooling water injection nozzle 11, the cooling water injection speed and the nozzle It is desirable to optimize the distance. That is, 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 becomes weak.
- the length of the upper cooling water spray nozzle 11 is preferably 120 to 240 mm. If the upper cooling water injection nozzle 11 is shorter than 120 mm, the distance between the lower surface of the upper header 10 and the upper surface of the partition plate 12 becomes too short, so that the drainage space above the partition plate 12 becomes small and the cooling drainage cannot be discharged smoothly. . On the other hand, if the length is longer than 240 mm, the pressure loss of the upper cooling water injection nozzle 11 becomes large, and the force penetrating the retaining water becomes weak.
- the jet speed of cooling water from the nozzle is preferably 6m / s or more. This is because, if it is less than 6 m / s, the force through which the cooling water penetrates the stagnant water (pass through the retaining water) becomes extremely weak. If it is 8 m / s or more, a larger cooling capacity can be secured, which is preferable. Further, the distance from the lower end of the upper cooling water injection nozzle 11 to the surface of the steel plate 1 is preferably 30 to 120 mm. If it is less than 30 mm, the frequency with which the steel plate 1 collides with the partition plate 12 becomes extremely high, and equipment maintenance becomes difficult. This is because if it exceeds 120 mm, the force through which the cooling water penetrates the stagnant water becomes extremely weak.
- the range of the water density where the cooling device 6 of the present embodiment is most effective is 1.5 m 3 / m 2 ⁇ min or more.
- the water flow rate is lower than this, the accumulated water does not become so thick, and even if a known technique of cooling the steel plate by free-falling the rod-shaped cooling water is applied, the temperature unevenness in the width direction It may not be so large.
- the water density is higher than 4.0 m 3 / m 2 ⁇ min, it is effective to use the cooling device 6 of the present embodiment, but there are problems in practical use such as an increase in equipment cost. Therefore, 1.5 to 4.0 m 3 / m 2 ⁇ min is the most practical water density.
- the cooling device 6 shown in FIG. 2 an example of the lower header 13 including the lower cooling water injection nozzle 12 similar to the cooling device on the upper surface side is shown, but the cooling water injected in the cooling on the lower surface side of the steel plate is Since it falls spontaneously after colliding with the steel plate, the temperature unevenness in the width direction does not become a big problem like the upper surface side of the steel plate. Therefore, the cooling device on the lower surface side of the steel plate is not particularly limited.
- the descaling device 4 directs a plurality of injection nozzles to the surface of the thick steel plate 1 after removing the distortion generated in the thick steel plate 1 by the first shape correction device 5 after hot rolling, and from these nozzles It is an apparatus that removes the scale generated on the surface of the thick steel plate 1 by spraying high-pressure water.
- the collision pressure P [MPa] of high-pressure water sprayed from the spray nozzle of the descaling device 4 onto the surface of the thick steel plate 1 is set to 1.5 MPa or more.
- the steel plate shape and mechanical properties of the thick steel plate 1 can be improved by removing the scale generated on the surface of 1 and then cooling the thick steel plate 1 with the cooling device 6.
- FIG. 7 shows the temperature distribution in the width direction of the steel plate from the center of the steel plate. As shown in FIG. However, since the temperature is lowered and the temperature is lowered, the surface temperature at the position in the width direction varies greatly and cannot be uniformly cooled, so that the steel plate shape and mechanical properties are affected.
- the present inventors have found that, depending on the descaling conditions, the scale is not sufficiently peeled off, but rather promotes unevenness in scale.
- the spray nozzle of the descaling device 4 sprays onto the surface of the thick steel plate 1 as shown in FIG. It was also clarified that when the impact pressure P [MPa] to be applied is 1.5 MPa or more, the scale is uniformly and completely peeled off, and the scale thickness to be regenerated thereafter becomes uniform at 5 ⁇ m or less.
- the collision pressure P [MPa] is set to 2.0 MPa or more, uniform thinning can be realized.
- the injection area A is obtained by the following equation (2) by an injection experiment.
- B spray spray width [cm]
- T spray spray thickness [cm]
- H spray distance (distance between spray nozzle of descaling device 4 and thick steel plate 1) [cm]
- ⁇ nozzle The spray angle (the spread angle of descaling water sprayed from the nozzle) [°].
- Equation (2) 0.6775 ⁇ Q ⁇ H ⁇ 2 (tan ( ⁇ / 2)) ⁇ 1.08 ⁇ Ps 0.5 (3) Is obtained.
- the form of the equation for obtaining the collision pressure Pc is not limited to this, and the pressure value at the landing position (direct cooling point or impact point) measured by a pressure sensor after actually performing an injection experiment is shown. A regression formula or the like may be used.
- the injection distance H [cm] for obtaining a predetermined collision pressure is obtained by the following equation (4) by modifying the equation (3).
- H ((0.6775 ⁇ Q ⁇ (tan ( ⁇ / 2)) ⁇ 1.08 ⁇ Ps 0.5 ) / Pc) 0.5 (4)
- Pc collision pressure [kgf / cm 2 ]
- Q injection flow rate [L / min]
- Ps injection pressure [kgf / cm 2 ]
- ⁇ nozzle injection angle [°].
- FIG. 8 shows that the injection flow rate Q is 64 L / min, the nozzle injection angle ⁇ (an angle at which the injection water spreads) is 32 °, and the nozzle attack angle (the central axis of the injection water is a steel plate traveling from a direction perpendicular to the steel plate.
- FIG. 5 is a graph showing the relationship between the injection pressure Ps and the injection distance H for achieving a collision pressure P of 1.5 MPa when the angle shifted to the upstream side of the direction is 15 °, and the injection pressure Ps is 50 MPa.
- the injection distance H when the injection distance H is 175 mm or less and the injection pressure Ps is 30 MPa, the injection distance H is 150 mm or less, and when the injection pressure Ps is 17.7 MPa, the injection distance H is 130 mm or less. It can be seen that when Ps is 14.7 MPa, the injection distance H should be 125 mm or less.
- the discharge pressure (spraying pressure) of the pump used in the normal descaling device 4 is 14.7 MPa (150 kgf / cm 2 ) or less
- the injection pressure at the nozzle tip is a pressure loss in the middle path. Further lower than 7 MPa. Therefore, it is preferable to use a pump with a high discharge pressure having an injection pressure Ps higher than usual.
- the upper limit of the injection pressure Ps is not particularly determined, but if the injection pressure Ps is increased, the energy required electric power becomes enormous. Therefore, the injection pressure Ps is preferably 50 MPa or less.
- the pump whose injection pressure Ps is 50 MPa is the highest injection pressure of a commercial pump (commercially available pump).
- the descaling device 4 in which the collision pressure P of the high-pressure water is set to 1.5 MPa or more removes the scale generated on the surface of the thick steel plate 1, thereby eliminating the variation in the scale thickness distribution. Therefore, when the thick steel plate 1 is cooled by the cooling device 6, as shown in FIG. 6, it can be uniformly cooled with almost no variation in the surface temperature in the width direction position, and the steel plate shape and mechanical properties are excellent.
- the thick steel plate 1 can be manufactured.
- the temperature unevenness in the width direction of the thick steel plate that has passed through the cooling device without surface treatment by the descaling device is about 40 ° C.
- the cooling by a general cooling device is performed after the descaling of the present invention described above.
- the uneven temperature in the width direction of the thick steel plate is reduced to about 10 ° C.
- temperature unevenness in the width direction of the thick steel plate 1 subjected to uniform cooling in the width direction by the cooling device 6 of the present embodiment shown in FIG. Decreases to about 4 ° C.
- the above expression (9) satisfies the following expression (10) from the above expression (6).
- the above expression (9) satisfies the following expression (11) from the above expression (7).
- the above formula (9) satisfies the following formula (12) from the above formula (8).
- the distance L from the scaling device 4 to the cooling device 6 is 12 to 107 m or less, cooling is stable, 5 to 47 m or less, cooling is more stable, and 1.3 to 12 m or less, cooling is very stable.
- the cooling is very stable, which is preferable.
- the distance L from the descaling device 4 to the cooling device 6 is 5 m or less.
- the distance L which is a condition in which the cooling is very stable at the conveyance speed V. Is more preferably 2.5 m or less.
- the hot rolling facility according to the present embodiment sets the collision pressure P [MPa] sprayed from the spray nozzle of the descaling device 4 to the surface of the thick steel plate 1 to 1.5 or more to set the thick steel plate 1.
- the thick steel plate 1 excellent in shape and mechanical properties can be manufactured by making the generated scale uniform and by the cooling device 6 to achieve uniform cooling.
- the step of removing the scale generated on the surface of the thick steel plate 1 with the descaling device 4 is performed, whereby the injection nozzle of the descaling device 4 Can be brought closer to the surface of the thick steel plate 1, and when 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 140 mm or less, the descaling capability is improved or predetermined. Since the injection pressure Ps and the injection flow rate Q for obtaining the collision pressure P can be reduced, the pumping capacity of the descaling device 4 can be reduced.
- the cooling of the thick steel plate 1 by the cooling device 6 is stabilized.
- the time t [s] from the end of removing the scale of the thick steel plate 1 by the descaling device 4 until the cooling of the thick steel plate 1 is started by the cooling device 6 is expressed as t ⁇ 5 ⁇ 10 ⁇ 9 ⁇ exp (25000 / When T) is satisfied, the cooling of the thick steel plate 1 by the cooling device 6 can be stabilized.
- the cooling device 6 cools the upper surface of the thick steel plate 1 by the cooling water supplied from the upper cooling water injection nozzle 11 through the water supply port 19 and has a high temperature. It becomes drainage and flows in the width direction of the thick steel plate 1 from above the partition plate 12 using the through hole 18 through which the upper cooling water injection nozzle 11 is not inserted as a drainage flow path. Since the cooling water flowing from the upper cooling water injection nozzle 11 through the water supply port 19 sequentially contacts the thick steel plate 1, sufficient and uniform cooling capacity is obtained in the width direction. be able to.
- produced during rolling is corrected with the 1st shape correction apparatus 5
- surface treatment of the thick steel plate 1 is performed with the descaling apparatus 4, and the controllability of cooling is stabilized. Therefore, the thick steel plate 1 processed by the second shape straightening device 7 originally has high flatness and the temperature of the thick steel plate 1 is uniform, so that the straightening reaction force of the second shape straightening device 7 does not need to be so high.
- the distance between the cooling device 6 and the second shape correcting device 7 may be longer than the maximum length of the thick steel plate 1 manufactured by the line.
- the second shape correction device 7 performs reverse correction or the like, and therefore the effect of preventing troubles such as the reversely fed thick steel plate 1 jumping on the transport roll and colliding with the cooling device 7, or cooling. It can be expected that the slight temperature deviation generated inside is made uniform, and the effect of avoiding the warp caused by the temperature deviation after correction is expected.
- cooling control was performed from 820 ° C. to 420 ° C. .
- the conditions under which the cooling calculated from the above-described equations (6), (7), and (8) is stable are as follows. After removing the scale of the thick steel plate 1 by the descaling device 4, the thick steel plate 1 is removed by the cooling device 6.
- the time t until the start of cooling is 42 s or less, preferably 19 s or less, more preferably 5 s or less.
- the descaling device 4 has a nozzle injection pressure of 17.7 MPa, an injection flow rate per nozzle of 64 L / min / product, an injection distance (the surface distance between the injection nozzle of the descaling device 4 and the thick steel plate 1) of 130 mm,
- the nozzle injection angle is 32 °, the 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, and the collision pressure is 1.5 MPa at all positions in the width direction. It is.
- the cooling facility 6 is provided with a flow path that allows the cooling water supplied to the upper surface of the steel plate to flow above the partition plate, and further drains from the side of the steel plate width direction as shown in FIG. did.
- the partition plate holes with a diameter of 12 mm are formed like a grid, and as shown in FIG. 3, the upper cooling water injection nozzles are inserted into the water supply ports arranged in a staggered pattern, and the remaining holes are drained. Used as. The distance between the lower surface of the upper header and the upper surface of the partition plate was 100 mm.
- the upper cooling water injection nozzle 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 steel plate width direction was 50 mm, and 10 rows of nozzles were arranged in the longitudinal direction in a zone with 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 installed so as to be at an intermediate position between the upper and lower surfaces of the partition plate having a plate thickness of 25 mm, and the distance to the steel plate surface was 80 mm.
- the cooling facility similar to the top surface cooling facility is used except that no partition plate is provided as shown in FIG. It was.
- the distance L from the descaling device 4 to the cooling device 6, the conveying speed V of the steel plate, and the time from the descaling device 4 to the cooling device 6 were varied.
- the descaling in Table 1 is a scale removing process of the thick steel plate 1 by the descaling device 4, and the controlled cooling is a cooling process of the thick steel plate 1 by the cooling device 6.
- Inventive Examples 1 to 5 are flatly cooled with almost no variation in the surface temperature in the width direction when cooled by the cooling device 6, as shown in FIG. The degree of re-correction due to poor shape was low, and the surface properties were good.
- inventive examples 1 to 3 in which the distance from the descaling device 4 to the cooling device 6 is 5 m are used to cool the thick steel plate 1 with the cooling device 6 after the descaling device 4 removes the scale of the thick steel plate 1.
- the time t until the start of the heat treatment is 19S or less, which is a condition that the cooling by the cooling device 6 is more stable from the above-described equation (6), regardless of the steel sheet conveyance speed V, and the re-correction rate is 5% or less. It was good.
- the distance from the descaling device 4 to the cooling device 6 is 2.5 m
- the nozzle injection pressure is 17.7 MPa
- the injection flow rate per nozzle is 64 L / min / line
- the nozzle spray angle to 40 °
- the nozzle attack angle to 15 °
- the recorrection rate was 1%. It was very good.
- SYMBOLS 1 Thick steel plate, 2 ... Heating furnace, 3 ... Hot rolling mill, 4 ... Descaling device, 5 ... 1st shape correction device (shape correction device), 6 ... Cooling device, 7 ... 2nd shape correction device DESCRIPTION OF SYMBOLS 10 ... Upper header (header), 11 ... Upper cooling water injection nozzle (cooling water injection nozzle), 12 ... Partition plate, 13 ... Lower header, 15 ... Lower cooling water nozzle, 16, 17 ... Draining roll, 18 ... Through Hole, 19 ... Water supply port, 20 ... Drain port
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
Description
そこで、特許文献1では、仕上げ圧延(finish rolling)の最終パス(fainal pass)の直前および直後の少なくとも一方でデスケーリング(descaling)を行い、続いて熱間矯正(hot leveling)を行い、その後にデスケーリングを行い、加速冷却(accelerate cooling)を開始する方法が開示されている。
また、特許文献2では、仕上げ圧延、熱間矯正を行い、制御冷却(controlled cooling)の直前にデスケーリングを行い、制御冷却を行う方法が開示されている。
そこで、本発明は、上記従来例の未解決の課題に着目してなされたものであり、デスケーリング工程において均一なデスケーリングを行い、冷却工程で均一な冷却を図ることにより、鋼板形状および機械的性質(mechanical property)に優れた厚鋼板の製造設備及び製造方法を提供することを目的とする。
本発明者等は、高圧水(high−pressure water)によりスケールの除去(removal)を起こす力について鋭意検討したところ、熱間形状矯正後にデスケーリングを行なう場合には、図5に示すように、デスケーリング装置から厚鋼板に噴射する冷却水の衝突圧力が1.5MPa以上であれば、製品のスケール厚み(scale thickness)が減少し、均一化することを明らかにした。高衝突圧(high pressure at the point of impact)のデスケーリングにより一旦スケールが均一に完全剥離(remove completely)し、その後、スケールが薄く均一に再生成したためである。したがって、この発明によると、冷却装置を通過する前の厚鋼板のスケール厚みが薄く均一になるので、冷却装置を通過するときに、厚鋼板の幅方向位置の表面温度のバラツキが殆ど無く均一に冷却することができ、鋼板形状、機械的性質に優れた厚鋼板となる。
また、本発明に係る厚鋼板の製造設備は、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距離Hが、40mm以上で140mm以下とすることが好ましい。この発明によると、所定の衝突圧力を得るためのデスケーリング装置の噴射圧力、噴射流量などが小さくてデスケーリング装置のポンプ圧力(pumping pressureまたはpump capacity)の低減化を図ることができる。
この発明によると、冷却水噴射ノズルから給水口を介して供給された冷却水が、厚鋼板の上面を冷却して高温の排水となって排水口から仕切り板の上方に流れていき、冷却後の排水が厚鋼板から速やかに排除されるようになっているので、冷却装置の十分且つ幅方向均一な冷却能力(cooling performance)を得ることができる。
この発明によると、冷却工程を行なう前の厚鋼板のスケール厚みが薄く均一になるので、冷却工程を行なう際に、厚鋼板の幅方向位置の表面温度のバラツキ(temperature deviation)が殆ど無く均一に冷却することができ、鋼板形状、機械的性質に優れた厚鋼板を製造することができる。
さらに、本発明に係る厚鋼板の製造方法は、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工程の完了から前記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が好ましい。この発明によると、冷却工程による厚鋼板の冷却を安定させることが可能となる。
本実施形態に係る熱間圧延設備は、図1に示すように、厚鋼板1の搬送方向上流側から順に、加熱炉2、熱間圧延機3、第1の形状矯正装置5、デスケーリング装置4、冷却装置6、第2の形状矯正装置7が設置されている。
第1の形状矯正装置5は、熱間圧延中に厚鋼板1に発生した歪(strain)を除去をするものであり、上下に千鳥状(staggered layout)に配設された矯正ロールによって厚鋼板1を挟圧するローラーレベラー方式(roller leveler type)の形状矯正装置を図示しているが、これに限定されずスキンパス圧延機(skin−pass mill)あるいはプレス装置(press machine)を用いてもよい。また、熱間圧延機3が粗圧延機及び仕上げ圧延機で構成されている場合には、仕上げ圧延機でスキンパス圧延(skin−pass rolling)を行ってもよい。
冷却装置6は、熱間圧延後の高温の厚鋼板1を所定の温度条件で制御冷却することにより、厚鋼板1の組織を制御し、所望の材質を得るための装置である。所望の冷却条件が得られるものであれば、どのような冷却装置を用いてもよいが、厚鋼板1の上下面、長手方向及び幅方向に均一な冷却を行なうことができる冷却装置が好ましい。そこで、本実施形態では、図2に示す、冷却能力が高く、特に幅方向の冷却均一性に優れた冷却装置6を用いる。
ここで、仮に仕切り板12がない場合、厚鋼板1の上面に供給された冷却水は、厚鋼板1の上面を幅方向に流れて排水されることとなるため、特に板幅端部付近において、この排水の流れが、上部冷却水噴射ノズル11からの冷却水が厚鋼板1の上面に達するのを阻害し、板幅端部付近の冷却能力が低下し、幅方向に均一な冷却を行なうことができない。それ故、厚鋼板1の幅方向の温度分布は、中央部が低く、板端部が高い凹型となる。これに対し、本実施形態の冷却装置6は、冷却後の排水が厚鋼板1の上面から仕切り板12の上方へ速やかに排除されるようになっているので、上部冷却水噴射ノズル11から噴出される冷却水が順次厚鋼板1に接触して十分な冷却能力が得られる。
即ち、ノズル内径は3~8mmが好適である。3mmより小さいとノズルから噴射する水の束が細くなり勢いが弱くなる。一方ノズル径が8mmを超えると流速が遅くなり、滞留水を貫通する力が弱くなるからである。
ここで、本実施形態は、デスケーリング装置4の噴射ノズルから厚鋼板1の表面に噴射する高圧水の衝突圧力P[MPa]を1.5MPa以上に設定し、このデスケーリング装置4で厚鋼板1の表面に発生したスケールを除去し、次いで、冷却装置6で厚鋼板1の冷却を行なうことにより、厚鋼板1の鋼板形状及び機械的性質を向上させることができる。
Pc=0.05757×(Q/A)1.08×Ps0.473 ……(1)
ただし、Pc:衝突圧力[kgf/cm2]、Q:噴射流量[L/min]、A:噴射面積[cm2]、Ps:噴射圧力[kgf/cm2]である。
A=B×T=(2Htan(θ/2))×(0.051H0.78×Q0.09×Ps−0.045) ……(2)
ただし、B:スプレーの噴射幅[cm]、T:スプレーの噴射厚み[cm]、H:噴射距離(デスケーリング装置4の噴射ノズルと厚鋼板1表面との距離)[cm]、θ:ノズル噴射角(ノズルから噴射されるデスケーリング水の拡がりの角度)[°]である。
Pc=0.6775×Q×H−2(tan(θ/2))−1.08×Ps0.5 ……(3)
が得られる。
なお、衝突圧力Pcを求める式の形はこれに限るものではなく、実際に噴射実験を行い、圧力センサー(pressure sensor)によって測定した着水位置(direct cooling point or impact point)での圧力値を回帰した式などを用いればよい。
H=((0.6775×Q×(tan(θ/2))−1.08×Ps0.5)/Pc)0.5…(4)
ただし、Pc:衝突圧力[kgf/cm2]、Q:噴射流量[L/min]、Ps:噴射圧力[kgf/cm2]、θ:ノズル噴射角[°]である。
これより、厚鋼板1の表面に噴射する衝突圧力P[MPa]を1.5MPa以上とするためには、噴射距離Hを、(4)式でPc=1.5/9.8×100=15.3[kgf/cm2]を代入して求められるHの値以下とすればよい。
ξ2=a×exp(−Q/RT)×t ……(5)
ただし、ξ:スケール厚み、a:定数(constant number)、Q:活性化エネルギー(activation energy)、R:定数、t:時間である。
t≦5×10−9×exp(25000/T) ……(6)
ただし、T:冷却前の厚鋼板温度[K]である。
また、デスケーリング装置4による厚鋼板1のスケールを除去終了後から、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(7)式を満たす場合に、冷却装置6による冷却がより安定することが明らかとなった。
t≦2.2×10−9×exp(25000/T) ……(7)
t≦5.6×10−10×exp(25000/T) ……(8)
一方、デスケーリング装置4から冷却装置6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の工程終了から冷却装置6の工程開始までの時間))とに対して次の(9)式を満たすように設定する。
L≦V×t …(9)
L≦V×5×10−9×exp(25000/T) ……(10)
また、上記(9)式は、上記(7)式から、次の(11)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) ……(11)
L≦V×5.6×10−10×exp(25000/T) ……(12)
上記の(10)~(12)式から、例えば冷却装置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から冷却装置6までの距離Lは12~107m以下で冷却が安定し、5~47m以下で冷却がより安定し、1.3~12m以下で冷却が非常に安定する。
以上のように、本実施形態の熱間圧延設備は、デスケーリング装置4の噴射ノズルから厚鋼板1の表面に噴射する衝突圧力P[MPa]を1.5以上に設定することで厚鋼板1に発生しているスケールの均一化を図り、冷却装置6で均一な冷却を図ることにより、形状及び機械的性質に優れた厚鋼板1を製造することができる。
また、デスケーリング装置4による厚鋼板1のスケールを除去終了後から冷却装置6で厚鋼板1の冷却を開始するまでの時間t[s]を、t≦5×10−9×exp(25000/T)を満たすようにすると、冷却装置6による厚鋼板1の冷却を安定させることができる。
なお、下面冷却設備については、図2に示すような、仕切り板を備えないこと以外は上面冷却設備と同様の冷却設備を用い、棒状冷却水の噴射速度および水量密度を上面の1.5倍とした。
特に、デスケーリング装置4から冷却装置6までの距離を5mとした本発明例1~3は、デスケーリング装置4による厚鋼板1のスケールを除去終了後から、冷却装置6で厚鋼板1の冷却を開始するまでの時間tが、鋼板の搬送速度Vによらず、前述した(6)式から冷却装置6による冷却がより安定する条件である19S以下であり、再矯正率が5%以下と良好であった。
また、デスケーリング装置4による設定条件を、水圧10MPa、ノズル1本あたりの噴射流量が10L/min/本、噴射距離が180mm、ノズル噴射角度が25°、ノズル迎え角が15°とし、衝突圧力を0.09MPaとした比較例2は、スケールが部分剥離することで鋼板幅方向の温度分布が悪化し、再矯正率が70%となった。
Claims (7)
- 熱間圧延機、形状矯正装置、デスケーリング装置及び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衝突圧力Pを1.5MPa以上とした厚鋼板の製造設備。
- 前記デスケーリング装置から前記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請求項1記載の厚鋼板の製造設備。
- 前記デスケーリング装置から前記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した請求項1に記載の厚鋼板の製造設備。
- 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距離Hが、40mm以上、140mm以下とした請求項1乃至3の何れか1項記載の厚鋼板の製造設備。
- 前記冷却装置が、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仕切り板とを備えるとともに、前記仕切り板には、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仕切り板上へ排水する排水口とが、複数設けられている請求項1乃至4の何れか1項記載の厚鋼板の製造設備。
- 熱間圧延工程、熱間矯正工程及び冷却工程の順番で厚鋼板を製造する方法において、前記熱間矯正工程及び前記冷却工程の間に、厚鋼板の表面に衝突圧力1.5MPa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。
- 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工程の完了から前記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請求項6記載の厚鋼板の製造方法。
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JP5962849B2 (ja) * | 2013-03-27 | 2016-08-03 | Jfeスチール株式会社 | 厚鋼板の製造設備および製造方法 |
TWI569898B (zh) * | 2013-03-27 | 2017-02-11 | Jfe Steel Corp | Manufacture method and manufacturing equipment of thick steel plate |
JP2014188543A (ja) * | 2013-03-27 | 2014-10-06 | Jfe Steel Corp | 厚鋼板の製造方法および製造設備 |
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JP2015174134A (ja) * | 2014-03-18 | 2015-10-05 | Jfeスチール株式会社 | 鋼板の製造方法 |
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KR20170033423A (ko) * | 2014-08-26 | 2017-03-24 | 제이에프이 스틸 가부시키가이샤 | 후강판의 제조 방법 |
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Also Published As
Publication number | Publication date |
---|---|
CN102361704A (zh) | 2012-02-22 |
EP2412455A1 (en) | 2012-02-01 |
KR101563206B1 (ko) | 2015-10-26 |
JP2010247228A (ja) | 2010-11-04 |
CN102361704B (zh) | 2015-03-25 |
US20120017660A1 (en) | 2012-01-26 |
EP2412455B1 (en) | 2018-03-14 |
EP2412455A4 (en) | 2013-05-29 |
JP5614040B2 (ja) | 2014-10-29 |
KR20140004265A (ko) | 2014-01-10 |
KR20110115163A (ko) | 2011-10-20 |
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