EP3195946B1 - Verfahren zur herstellung dicker stahlplatten - Google Patents

Verfahren zur herstellung dicker stahlplatten Download PDF

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Publication number
EP3195946B1
EP3195946B1 EP15836765.6A EP15836765A EP3195946B1 EP 3195946 B1 EP3195946 B1 EP 3195946B1 EP 15836765 A EP15836765 A EP 15836765A EP 3195946 B1 EP3195946 B1 EP 3195946B1
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EP
European Patent Office
Prior art keywords
steel plate
descaling
cooling
water
jetting
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EP15836765.6A
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English (en)
French (fr)
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EP3195946A1 (de
EP3195946A4 (de
Inventor
Yuta TAMURA
Hiroyuki Fukuda
Kenji Adachi
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JFE Steel Corp
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JFE Steel Corp
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Publication of EP3195946A4 publication Critical patent/EP3195946A4/de
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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
    • B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
    • 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
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/06—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing of strip material

Definitions

  • the present invention relates to a method for manufacturing a steel plate in which hot rolling, shape correction, and accelerated cooling are performed.
  • Patent Literature 1 discloses a method in which descaling immediately before and/or immediately after a last pass of finish rolling, hot correction, descaling forced cooling are performed in this order.
  • Patent Literature 2 discloses a method in which descaling is performed after finish rolling and hot shape correction, and forced cooling is performed thereafter.
  • Patent Literature 3 discloses a method in which, descaling is performed immediately before controlled cooling with controlling impact pressure of cooling water.
  • Patent Literature 4 discloses a steel plate manufacturing facility comprising a hot rolling mill, a hot leveler, a descaler and cooling equipment, wherein a pressure at the point of impact of cooling water sprayed from the descaler to each surface of the steel plate is greater than or equal to 1.5 MPa.
  • Patent Literature 4 does not disclose the energy density of the descaling water.
  • the present invention is made in view of the aforementioned problems that are not solved by the prior art. It is an object of the present invention to provide a method for manufacturing steel plate having excellent shapes and excellent mechanical properties, by performing uniform cooling in a cooling step by uniformizing scales that are generated on surfaces of the steel plate uniform in a descaling step.
  • the inventors carried out assiduous studies regarding forces that cause scales to be peeled off by using descaling water, and found out that, when descaling is performed after hot shape correction, if two or more rows of jetting nozzles of descaling apparatus are set in a longitudinal direction of the steel plate, and if the energy density of the descaling water that is jetted to the steel plate from the two or more rows of jetting nozzles is greater than or equal to 0.08 J/mm 2 in total, the thicknesses of scales that are generated on product surfaces become uniform. As a result, when the steel plate passes through an accelerated cooling apparatus, the steel plate can be uniformly cooled almost without variations in surface temperatures at locations on the steel plate in a width direction thereof, to have excellent shapes.
  • the invention provides a method for manufacturing a steel plate according to the appended claims.
  • Fig. 1 is a schematic view of a facility for manufacturing a steel plate according to an embodiment of the method the present invention.
  • the direction of an arrow corresponds to a conveyance direction of the steel plate.
  • a heating furnace 1 From an upstream side in the conveyance direction of the steel plate, a heating furnace 1, a descaling apparatus 2, a rolling apparatus 3, a shape correcting apparatus 4, a descaling apparatus 6, a descaling apparatus 7, and an accelerated cooling apparatus 5 are set in this order.
  • a slab not shown
  • the slab is descaled for primary scale removal in the descaling apparatus 2.
  • the rolling apparatus 3 performs rough rolling and finish rolling on the slab, so that the slab is rolled to form a steel plate having a predetermined plate thickness (not shown). Only one rolling apparatus 3, which is illustrated, is used.
  • the rolling apparatus 3 may include a rough rolling apparatus and a finish rolling apparatus.
  • the descaling apparatus 6 and the descaling apparatus 7 perform descaling for completely removing scale.
  • the accelerated cooling apparatus 5 performs controlled cooling by water cooling or air cooling.
  • the shape of the steel plate after the cooling it is suitable to perform accelerated cooling after adjusting the shape of the steel plate via the shape correcting apparatus 4.
  • the shape correcting apparatus 4 corrects distortion of the steel plate that occurs during hot rolling. Fig.
  • the shape correcting apparatus is not limited to the roller leveler type.
  • the shape correcting apparatus may be a skin pass type or a press type.
  • skin pass correction may be performed by using the finish rolling apparatus.
  • the steel plate is cooled to a predetermined temperature by using cooling water that is jetted from an upper surface cooling facility and a lower surface cooling facility. Thereafter, if necessary, the shape of the steel plate is further corrected by using a shape correcting apparatus (not shown) provided on-line or off-line at a downstream side.
  • This shape correcting apparatus corrects distortion of the steel plate that occurs during the cooling by the accelerated cooling apparatus 5. In the present invention, this shape correcting apparatus need not be used.
  • This shape correcting apparatus may be a skin pass type or a press type in addition to a roller leveler type.
  • two sets of descaling apparatus that is, the descaling apparatus 6 and the descaling apparatus 7 are set between the shape correcting apparatus 4 and the accelerated cooling apparatus 5.
  • Energy density E of descaling water that is jetted to surfaces of the steel plate from the descaling apparatus 6 and the descaling apparatus 7 is greater than or equal to 0.08 J/mm 2 in total for the two rows of jetting nozzles.
  • the descaling machine 6 and the descaling apparatus 7 remove scale generated on the surfaces of the steel plate, and then the accelerated cooling apparatus 5 cools the steel plate to make it possible to improve the shape and the mechanical properties of the steel plate.
  • the descaling apparatus shown in Fig. 1 is formed in only two rows. Descaling apparatus may be formed in three or more rows. When descaling apparatus are formed in three or more rows, the energy density E of the descaling water that is jetted to the surfaces of the steel plate is greater than or equal to 0.08 J/mm 2 in total for the number of rows.
  • the scale is removed by peeling or destruction.
  • the inventors carried out assiduous studies and found out that, by performing descaling two or more times after hot shape correction, the effects of thermal stress that is generated at the time of descaling can be provided two or more times.
  • the inventors found out that, as shown in Fig. 3 , the scale can be removed more efficiently when the descaling is performed two times than when the descaling is performed only one time.
  • the inventors found out that, if the energy density E of the descaling water that is jetted to the steel plate from the two rows of jetting nozzles of the descaling apparatus is greater than equal to 0.08 J/mm 2 in total, the scale thickness of the product is reduced and becomes uniform.
  • the number of jettings shown in Fig. 3 is two. The inventors confirmed that even if the number of jettings is three or more, the same effects are obtained. This is because, by the descaling, scale is completely and uniformly peeled off once, and then, scale is uniformly and thinly regenerated.
  • the steel plate since the scale thickness of the steel plate before the steel plate passes through the accelerated cooling apparatus is small and uniform, when the steel plate passes through the accelerated cooling apparatus, the steel plate can be uniformly cooled almost without variations in surface temperatures of locations on the steel plate in the width direction thereof. Therefore, the steel plate has an excellent shape and excellent mechanical properties.
  • the inventors carried out further studies and found out that, as a simple definition of energy density E (J/mm 2 ) of the descaling water that is jetted to the steel plate, the expression “(water amount density) ⁇ (jetting pressure) ⁇ (collision time)” may be used.
  • the water amount density (m 3 /(mm 2 ⁇ min)) is a value that is calculated by using "jetting flow rate of descaling water ⁇ collision area of descaling water”.
  • the collision time (s) is a value that is calculated by using "collision thickness of descaling water ⁇ conveyance velocity of steel plate".
  • the energy density E has no upper limit as descaling capability.
  • the energy density E becomes greater than or equal to 0.80 J/mm 2 in total for two or more rows of jetting nozzles, for example, the pump discharge pressure becomes extraordinarily high. Therefore, this is not desirable.
  • the fluid velocity v of descaling water that is jetted from the jetting nozzles of the descaling apparatus 6 and the descaling apparatus 7.
  • the inventors found out that the relationship between the fluid velocity v and the jetting distance is as shown in Fig. 4 .
  • the fluid velocity which is indicated along the vertical axis, is determined by solving an equation of motion considering buoyancy and air resistance.
  • the fluid velocity v of descaling water is reduced as the descaling water moves and reaches the steel plate during jetting. Therefore, the smaller the jetting distance, the higher the fluid velocity v at the time of collision with the steel plate, so that a large energy density can be provided. From Fig. 4 , in particular, since attenuation becomes large as a jetting distance H exceeds 200 mm, it is desirable that the jetting distance H be less than or equal to 200 mm.
  • the jetting distance the smaller the jetting pressure, the jetting flow rate, etc., for providing a predetermined energy density can be made, so that it is possible to reduce the pumping power of the descaling apparatus 6 and the descaling apparatus 7.
  • the steel plate whose shape has been corrected by the shape correcting apparatus 4 moves into the descaling apparatus 6 and the descaling apparatus 7. Therefore, the jetting nozzles of the descaling apparatus 6 and the descaling apparatus 7 can be brought close to the surfaces of the steel plate.
  • the jetting distance be greater than or equal to 40 mm. From the above, in the present invention, it is desirable that the jetting distance H be greater than or equal to 40 mm and less than or equal to 200 mm.
  • the pump discharge power of the ordinary descaling apparatus 6 and descaling apparatus 7 is greater than or equal to 14.7 MPa. Therefore, it is desirable that the jetting pressure of descaling water be greater than or equal to 14.7 MPa.
  • the upper limit of the jetting pressure is not particularly determined. However, when the jetting pressure becomes large, the pumps that supply descaling water consume an extraordinarily large amount of energy. Therefore, it is desirable that the jetting pressure be less than or equal to 50 MPa.
  • the descaling apparatus 6 and the descaling apparatus 7 in which the energy density E of the descaling water that is jetted from two or more jetting nozzles is set greater than or equal to 0.08 J/mm 2 remove the scale that is generated on the surfaces of the steel plate. As a result, variations in scale thickness are eliminated. Therefore, when the steel plate is cooled by the accelerated cooling apparatus 5, as shown in Fig. 5 , the steel plate can be uniformly cooled almost without variations in surface temperatures of locations in the width direction, and have excellent shape and mechanical properties.
  • a descale header 6-1 of the descaling apparatus 6 and a descale header 7-1 of the descaling apparatus 7 are formed in two rows in the longitudinal direction of the steel plate.
  • the descale headers shown in Fig. 6(a) are configured in two rows.
  • Descale headers may be configured in three or more rows.
  • Descaling water is jetted from a plurality of jetting nozzles 6-2 and 7-2 of the descale headers to the steel plate, and a spray pattern 22 as shown in Fig. 6(b) is formed.
  • the jetting nozzles 6-2 of the descaling apparatus 6 and the jetting nozzles 7-2 of the descaling apparatus 7 in order to prevent splashed descaling water from the second row from interfering with descaling water from the first row, it is desirable that the jetting nozzles 6-2 be separated from the jetting nozzles 7-2 by 500 mm or more in the longitudinal direction. Further, as shown in Fig. 6(b) , it is desirable that jetting patterns in the width direction be such that the first row and the second row are in a staggered arrangement.
  • the energy density of the descaling water jetted from two jetting nozzles, the jetting nozzle 6-2 and the jetting nozzle 7-2, is such that, after a crack has been formed in scale by the thermal stress effect produced by the descaling by the first row, the scale is removed at a high energy density by the descaling by the second row to allow the scale to be efficiently removed. Accordingly, in order to form a crack in the scale by the thermal stress effect produced by the descaling by the first row, it is essential that the energy density of the descaling water from the first row be greater than or equal to 0.01 J/mm 2 , and that the energy density of the descaling water from the second row be greater than that of the descaling water from the first row by 0.04 J/mm 2 or greater.
  • the nozzle rows be separated by 500 mm or more in the longitudinal direction and be in a staggered arrangement.
  • the energy density of the descaling water jetted from the jetting nozzles of the descaling apparatus in a row just before the final row be greater than or equal to 0.01 J/mm 2 and that the energy density of the descaling water jetted from the jetting nozzles of the descaling apparatus in the final row be greater than the energy density of the descaling water jetted from the jetting nozzles of the descaling apparatus in the row just before the final row by 0.04 J/mm 2 or greater.
  • the following Expression (3) can be derived based on Expression (2) above. That is, when the time t [s] from the completion of the removal of the scale on the steel plate by the descaling apparatus 7, which is the downstream-side one of the descaling apparatus 6 and the descaling apparatus 7, to the start of the cooling of the steel plate by the accelerated cooling apparatus 5 satisfies the following Expression (3), the cooling by the accelerated cooling apparatus 5 becomes stable: t ⁇ 5 ⁇ 10 ⁇ 9 ⁇ exp 25000 / T where T [K]: temperature of steel plate before cooling.
  • the following Expression (5) can be derived based on Expression (2) above. That is, when the time t [s] from the completion of the removal of the scale on the steel plate by the descaling apparatus 7 to the start of the cooling of the steel plate by the accelerated cooling apparatus 5 satisfies the following Expression (5), the cooling by the accelerated cooling apparatus 5 becomes very stable: t ⁇ 5.6 ⁇ 10 ⁇ 10 ⁇ exp 25000 / T
  • a distance L from an exit side of the descaling apparatus 7 to an entrance side of the accelerated cooling apparatus 5 is set so as to satisfy the following Expression (6) in relation to the conveyance velocity of the steel plate V and the time t (time from the completion of a descaling step by the descaling apparatus 7 to the start of a step by the accelerated cooling apparatus 5): L ⁇ V ⁇ t where L: distance (m) from the descaling apparatus 7 to the accelerated cooling apparatus 5, V: conveyance velocity of the steel plate (m/s), and t: time (s).
  • Expression (8) can be derived from Expression (6) and Expression (4) above. In the present invention, it is desirable that Expression (8) be satisfied: L ⁇ V ⁇ 2.2 ⁇ 10 ⁇ 9 ⁇ exp 25000 / T
  • Expression (9) can be derived from Expression (6) and Expression (5) above. In the present invention, it is desirable that Expression (9) be satisfied: L ⁇ V ⁇ 5.6 ⁇ 10 ⁇ 10 ⁇ exp 25000 / T
  • the cooling becomes stable when the distance L from the descaling apparatus 7 to the accelerated cooling apparatus 5 is greater than or equal to 12 m and less than or equal to 107 m; the cooling becomes more stable when the distance L is greater than or equal to 5 m and less than or equal to 47 m, and the cooling becomes very stable when the distance L is greater than or equal to 1.3 m and less than or equal to 12 m.
  • the distance L which is a condition in which the cooling becomes very stable at this conveyance velocity V, be less than or equal to 2.5 m.
  • the cooling can be similarly made stable when the distance L from the descaling apparatus 7 to the accelerated cooling apparatus 5 is desirably less than or equal to 12 m, is more desirably less than or equal to 5 m, and even more desirably less than or equal to 2.5 m. This is due to the following reason.
  • the upper surface cooling facility of the accelerated cooling apparatus 5 includes an upper header 11 that supplies cooling water to an upper surface of a steel plate 10, cooling water injection nozzles 13 that are suspended from the upper header 11 and that are used for jetting rod-like cooling water, and a partition wall 15 that is set between the steel plate 10 and the upper header 11. It is desirable that the partition wall 15 have a plurality of water supply ports 16 in which lower end portions of the cooling water injection nozzles 13 are inserted, and a plurality of water drainage ports 17 for draining away the cooling water, supplied to the upper surface of the steel plate 10, to an upper side of the partition wall 15.
  • the upper surface cooling facility includes the upper header 11 that supplies cooling water to the upper surface of the steel plate 10, the cooling water injection nozzles 13 that are suspended from the upper header 11, and the partition wall 15 that is set horizontally along the width direction of the steel plate and between the upper header 11 and the steel plate 10, and that has a plurality of through holes (the water supply ports 16 and the water drainage ports 17).
  • the cooling water injection nozzles 13 are circular tube nozzles for jetting rod-like cooling water. Ends of the cooling water injection nozzles 13 are inserted into the through holes (the water supply ports 16) in the partition wall 15, and are situated above a lower end portion of the partition wall 15.
  • cooling water injection nozzles 13 In order to prevent the cooling water injection nozzles 13 from being clogged by sucking in foreign matter at a bottom portion in the upper header 11, it is desirable that the cooling water injection nozzles 13 penetrate the upper header 11 such that upper ends of the cooling water injection nozzles 13 protrude into the upper header 11.
  • the term "rod-like cooling water” refers to cooling water which is jetted in a state in which the cooling water is compressed to a certain extent from circular nozzle jetting ports (including elliptical and polygonal nozzle jetting ports), and which is a continuous and straight stream, the jetting speed of the cooling water from the nozzle jetting ports being 6 m/s or higher and, desirably, 8 m/s or higher, and, the cross section of the stream jetted from the nozzle jetting ports being maintained in a substantially circular shape. That is, the cooling water differs from that which flows so as to fall freely from round tube laminar nozzles, and that which is jetted in liquid drops like a spray.
  • the ends of the cooling water injection nozzles 13 are inserted into the through holes so as to be set above the lower end portion of the partition wall 15, so that, even if a steel plate whose end is warped upward moves in, the cooling water injection nozzles 13 are prevented from becoming damaged by the partition wall 15. This makes it possible to perform cooling for a long time with the cooling water injection nozzles 13 in a good state. Therefore, it is possible to prevent the occurrence of temperature unevenness in the steel plate without, for example, repairing the facility.
  • the ends of the circular tube nozzles 13 are inserted in the through holes, as shown in Fig. 14 , the ends of the circular tube nozzles 13 do not interfere with the flow in the width direction of drainage water that flows along an upper surface of the partition wall 15 and that is indicated by a dotted arrow. Therefore, the cooling water jetted from the cooling water injection nozzles 13 can evenly reach the upper surface of the steel plate regardless of locations in the width direction, so that uniform cooling can be performed in the width direction.
  • the partition wall 15 has a plurality of through holes, each having a diameter of 10 mm, in a grid pattern and at a pitch of 80 mm in the width direction of the steel plate and at a pitch of 80 mm in the conveyance direction.
  • the cooling water injection nozzles 13, each having an outside diameter of 8 mm, an inside diameter of 3 mm, and a length of 140 mm, are inserted in the water supply ports 16.
  • the cooling water injection nozzles 13 are set in a hound's-tooth check-like form.
  • the through holes in which the cooling water injection nozzles 13 are not inserted correspond to the water drainage ports 17 for the cooling water.
  • the plurality of through holes in the partition wall 15 of the accelerated cooling apparatus include the water supply ports 16 and the water drainage ports 17 that are substantially the same in number, with their roles and functions being divided among the water supply ports 16 and the water drainage ports 17.
  • the total sectional area of the water drainage ports 17 is sufficiently larger than the total sectional area of the inside of the circular tube nozzles 13, which are the cooling water injection nozzles 13, and is approximately 11 times the total sectional area of the inside of the circular tube nozzles 13.
  • the cooling water supplied to the upper surface of the steel plate fills a space between a surface of the steel plate and the partition wall 15, flows through the water drainage ports 17, is guided to a location above the partition wall 15, and is quickly discharged.
  • Fig. 10 is a front view illustrating flow of drainage cooling water near an end portion at the upper side of the partition wall in the width direction of the steel plate.
  • a draining direction of the water drainage ports 17 is upward in a direction that is opposite to a cooling water jetting direction.
  • the drainage cooling water that has flown out to a location above the partition wall 15 changes direction towards an outer side in the width direction of the steel plate, flows to a water drain flow path between the upper header 11 and the partition wall 15, and is drained off.
  • the water drainage ports 17 are inclined in the width direction of the steel plate to cause the draining direction to be in an oblique direction towards the outer side in the width direction of the steel plate. This allows drainage water 19 at the upper side of the partition wall 15 to flow smoothly in the width direction of the steel plate, and the water drainage is accelerated. Therefore, this is desirable.
  • the accelerated cooling apparatus includes the water supply ports 16 and the water drainage ports 17 that are separately provided. Since the roles of supplying water and draining off water are divided among the water supply ports 16 and the water drainage ports 17, the drainage cooling water flows through the water drainage ports 17 in the partition wall 15 and smoothly flows to a location above the partition wall 15. Therefore, the drain water after the cooling is quickly drained off from the upper surface of the steel plate, so that cooling water that is subsequently supplied can easily penetrate the stagnant water film, and, thus, a sufficient cooling capacity can be provided.
  • the temperature distribution in the steel plate in the width direction thereof in this case is a uniform temperature distribution, so that a uniform temperature distribution can be provided in the width direction.
  • the cooling water is quickly discharged.
  • This can be realized, for example, when ports having a size that is greater than the outside diameter of the circular tube nozzles 13 are formed in the partition wall 15, and the number of water drainage ports is greater than or equal to the number of water supply ports.
  • the total sectional area of the water drainage ports 17 is less than 1.5 times the total sectional area of the inside of the circular tube nozzles 13, the flow resistance at the water drainage ports is increased and, thus, it becomes difficult to drain off stagnant water. As a result, the amount of cooling water that can penetrate the stagnant water film and reach the surface of the steel plate is considerably reduced, thereby reducing the cooling capacity. Therefore, this is not desirable. It is more desirable that the total sectional area of the water drainage ports 17 be greater than or equal to 4 times the total sectional area of the inside of the circular tube nozzles 13.
  • the ratio between the total sectional area of the water drainage ports and the total sectional area of the inside of the circular tube nozzles 13 be in the range of 1.5 to 20.
  • gaps between outer peripheral surfaces of the circular tube nozzles 13, which are inserted in the water supply ports 16 in the partition wall 15, and inner surfaces defining the water supply ports 16 be less than or equal to 3 mm in size.
  • the gaps are large, due to the effects of accompanied flow of the cooling water that is jetted from the circular tube nozzles 13, the drainage cooling water discharged to the upper surface of the partition wall 15 is sucked into the gaps between the water supply ports 16 and the outer peripheral surfaces of the circular tube nozzles 13, and is re-supplied to the steel plate. Therefore, the cooling efficiency is reduced.
  • the outside diameter of the circular tube nozzles 13 be substantially the same as the size of the water supply ports 16.
  • gaps of up to 3 mm, at which the effects are substantially small are allowed. It is more desirable that the gaps be less than or equal to 2 mm in size.
  • the inside diameter and length of the circular tube nozzles 13, the jetting speed of the cooling water, and nozzle distance also need to be optimal values.
  • the nozzle inside diameter be 3 to 8 mm.
  • the nozzle inside diameter is less than 3 mm, a flux of water that is jetted from the nozzles becomes thinner, and, thus, water strength is reduced.
  • the nozzle diameter exceeds 8 mm, the flow speed is reduced, as a result of which the force for causing the cooling water to penetrate the stagnant water film is reduced.
  • each circular tube nozzle 13 be 120 to 240 mm.
  • the length of each circular tube nozzle 13 refers to the length from an inlet at the upper end of each nozzle that penetrates the header by a certain amount to a lower end of each nozzle inserted in the corresponding water supply port in the partition wall.
  • each circular tube nozzle 13 is shorter than 120 mm, the distance between a lower surface of the header and the upper surface of the partition wall becomes too small (for example, when the header thickness is 20 mm, a protruding amount of the upper end of each nozzle into the header is 20 mm, and an insertion amount of the lower end of each nozzle into the partition wall is 10 mm, the distance becomes less than 70 mm).
  • the jetting speed of the cooling water from the nozzles needs to be greater than or equal to 6 m/s, and, desirably, greater than or equal to 8 m/s. This is because, when the jetting speed is less than 6 m/s, the force for causing the cooling water to penetrate the stagnant water film becomes extremely weak. When the jetting speed is greater than or equal to 8 m/s, a higher cooling capacity can be provided. Therefore, this is desirable.
  • the distance from the lower end of each cooling water injection nozzle 13, used for cooling the upper surface of the steel plate, to the surface of the steel plate 10 may be 30 to 120 mm. When this distance is less than 30 mm, the frequency with which the steel plate 10 collides with the partition wall 15 is extremely high. Therefore, it becomes difficult to maintain the facility. When this distance exceeds 120 mm, the force for causing the cooling water to penetrate the stagnant water film becomes extremely weak.
  • draining rollers 20 may be set in front of and behind the upper header 11 so as to prevent the cooling water from spreading in the longitudinal direction of the steel plate. This causes a cooling zone length to be constant, and facilitates temperature control.
  • the draining rollers 20 intercept the flow of the cooling water in the conveyance direction of the steel plate, the drainage cooling water flows to the outer side in the width direction of the steel plate. However, the cooling water tends to stagnate near the draining rollers 20.
  • the cooling water injection nozzles in an uppermost-stream-side row in the conveyance direction of the steel plate be tilted towards an upstream side in the conveyance direction of the steel plate by 15 to 60 degrees
  • the cooling water injection nozzles in a lowermost-stream-side row in the conveyance direction of the thick steel sheet be tilted towards a downstream side in the conveyance direction of the steel plate by 15 to 60 degrees.
  • the distance between the lower surface of the upper header 11 and the upper surface of the partition wall 15 is such that the sectional area of a flow path in the width direction of the steel plate in a space surrounded by the lower surface of the header and the upper surface of the partition wall is greater than or equal to 1.5 times the total sectional area of the inside of the cooling water injection nozzles, and is, for example, greater than or equal to approximately 100 mm.
  • the sectional area of the flow path in the width direction of the steel plate is not greater than or equal to 1.5 times the total sectional area of the inside of the cooling water injection nozzles, the drainage cooling water discharged to the upper surface of the partition wall 15 from the water drainage ports 17 in the partition wall cannot be smoothly discharged in the width direction of the steel plate.
  • the range of the water amount density that is most effective is greater than or equal to 1.5 m 3 /(m 2 ⁇ min).
  • the water amount density is lower than this value, the stagnant water film does not become so thick, and, even if a publicly known technology of cooling the steel plate by causing the rod-like cooling water to fall freely is applied, there are cases in which the degree of temperature unevenness in the width direction does not become so large.
  • the water amount density is greater than 4.0 m 3 /(m 2 ⁇ min)
  • the use of the technology according to the present invention is effective.
  • the range of 1.5 to 4.0 m 3 /(m 2 ⁇ min) is the most practical water amount density.
  • the cooling technology according to the present invention In applying the cooling technology according to the present invention, the case of disposing the draining rollers in front of and behind the cooling header is particularly effective.
  • the cooling technology according to the present invention is applicable to the case in which the draining rollers are not provided.
  • a cooling apparatus at a side of a lower surface of the steel plate is not particularly limited.
  • a cooling lower header 12 provided with circular tube nozzles 14 as in the cooling apparatus at the side of the upper surface of the steel plate is given.
  • a partition wall 15 for evacuating drainage cooling water in the width direction of the steel plate like the one used in cooling the upper surface of the steel plate, need not be used.
  • a publicly known technology of supplying, for example, membranous cooling water or cooling water in the form of a spray may be used.
  • the scale on the steel plate 10 can be made uniform, and uniform cooling can be performed by the accelerated cooling apparatus 5.
  • the steel plate 10 can be manufactured as one having excellent shape.
  • the jetting nozzles of the descaling apparatus 6 and the jetting nozzles of the descaling apparatus 7 can be brought close to the surfaces of the steel plate 10.
  • the jetting distance H distance from the jetting nozzles of the descaling apparatus 6 and the jetting nozzles of the descaling apparatus 7 to the surfaces of the steel plate 10.
  • descaling capacity is increased.
  • the jetting pressure, the jetting flow rate, etc., for obtaining the predetermined energy density E are low. Therefore, it is possible to reduce the pumping power of the descaling apparatus 6 and the descaling apparatus 7.
  • the cooling water supplied from the upper cooling water injection nozzles 13 through the water supply ports 16 cools the upper surface of the steel plate 10 and becomes hot drain water, and flows in the width direction of the steel plate 10 from above the partition wall 15 with the water drainage ports 17, in which the upper cooling water injection nozzles 13 are not inserted, being drain water flow paths.
  • the drain water after the cooling is quickly removed from the steel plate 10, so that, by successively bringing the cooling water that flows from the upper cooling water injection nozzles 13 through the water supply ports 16 into contact with the steel plate 10, a sufficient cooling capacity can be provided uniformly in the width direction.
  • the inventors carried out studies and found out that the degree of temperature unevenness in the width direction of the steel plate subjected to accelerated cooling without being subjected to descaling such as that in the present invention is approximately 40°C.
  • the inventors found out that the degree of temperature unevenness in the width direction of the steel plate cooled by the accelerated cooling apparatus 5 after the descaling by the descaling apparatus 6 and the descaling apparatus 7 above is reduced to approximately 10°C.
  • the inventors found out that the degree of temperature unevenness in the width direction of the steel plate subjected to accelerated cooling by using the accelerated cooling apparatus 5 shown in Fig. 7 after the descaling by the descaling apparatus 6 and the descaling apparatus 7 is reduced to approximately 4°C.
  • the distribution of the surface temperature in the steel plate after the accelerated cooling is measured by using a scanning type thermometer and the degree of temperature unevenness in the width direction is calculated on the basis of the results of the measurement.
  • any distortion that has occurred during rolling is corrected by the shape correcting apparatus 4 and the steel plate 10 is descaled by the descaling apparatus 6 and the descaling apparatus 7 to stabilize the controllability of cooling. Therefore, the steel plate 10 to be subjected to correction by a shape correcting apparatus that is provided on-line or off-line at a downstream side of the facility for manufacturing the steel plate also has high flatness and uniform temperature by its nature. Therefore, the correcting capability of the shape correcting apparatus that is provided at the downstream side need not be very high.
  • the distance between the accelerated cooling apparatus 5 and the shape correcting apparatus that is provided at the downstream side may be larger than the maximum length of the steel plate 10 that is manufactured in a rolling line.
  • Controlled cooling was performed from 820°C to 420°C after passing a steel plate having a sheet thickness of 30 mm and a width of 3500 mm and rolled by the rolling apparatus 3 through the shape correcting apparatus 4, the descaling machine 6, and the descaling apparatus 7.
  • the time t from the completion of the removal of scale on the steel plate by the descaling apparatus 7 to the start of the cooling of the steel plate by the accelerated cooling apparatus 5 is desirably less than or equal to 42 s, more desirably, less than or equal to 19 s, and even more desirably, less than or equal to 5 s.
  • the descaling apparatus 6 and the descaling apparatus 7 were such that two rows of nozzles were set in a longitudinal direction such that jetting areas of adjacent nozzles were arranged side by side in the width direction so as to overlap each other to a certain extent, with the spray jet thickness being 3 mm and the spray jet width being 175 mm.
  • the nozzles were flat spray nozzles.
  • the energy density of the descaling water is a value defined by the aforementioned expression "water amount density ⁇ jetting pressure ⁇ collision time”.
  • the collision time (s) is a time when descaling water is jetted to the surfaces of the steel plate, and is determined by dividing the spray jet thickness by the conveyance velocity.
  • the accelerated cooling apparatus 5 is a facility including flow paths that allow cooling water supplied to the upper surface of the steel plate to flow to a location above the partition wall as shown in Fig. 7 , and further allow the water to be drained off from a side of the steel plate in the width direction as shown in Fig. 10 .
  • the partition wall had holes having a diameter of 12 mm and arranged in a grid pattern, and were such that, as shown in Fig. 9 , the upper cooling water injection nozzles was inserted into the water supply ports set in a hound's-tooth check-like arrangement, and the remaining ports were water drainage ports.
  • 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 injection nozzles of the accelerated cooling apparatus 5 had an inside diameter of 5 mm, an outside diameter of 9 mm, and a length of 170 mm, and their upper ends protruded into the header.
  • the jetting speed of the rod-like cooling water was 8.9 m/s.
  • the nozzle pitch in the width direction of the steel plate was 50 mm, 10 rows of nozzles were set side by side in the longitudinal direction in a zone of a distance of 1 m between table rollers.
  • the water amount density at the upper surface was 2.1 m 3 /(m 2 ⁇ min).
  • the lower ends of the upper-surface cooling nozzles were set at intermediate positions between the upper surface and the lower surface of the partition wall having a sheet thickness of 25 mm, and the distance to the surface of the steel plate was 80 mm.
  • a cooling facility that is the same as the upper surface cooling facility was used except that the cooling facility did not include a partition wall.
  • the water amount density and the jetting speed of the rod-like cooling water were 1.5 times those of the upper surface cooling facility.
  • T in Table 1 denotes the temperature (K) of each steel plate before cooling.
  • the re-correction percentage (%) was evaluated. More specifically, if warping of the entire length of any steel plate and/or warping of the entire width of any steel plate was/were within a standard value prescribed by a product standard corresponding to the steel plate, it was determined that the result was acceptable, whereas, if not, it was determined that the steel plate was one to be subjected to shape correction again, with the re-correction percentage being calculated by using the expression "(number of sheets to be subjected to shape correction again)/(total number of sheets) ⁇ 100".

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (3)

  1. Verfahren zum Herstellen eines Stahlblechs, das einen Warmwalz-Schritt, einen Warmkorrektur-Schritt und einen Schritt zum beschleunigten Abkühlen zum Herstellen des Stahlblechs in dieser Reihenfolge umfasst, wobei das Verfahren des Weiteren umfasst:
    einen Entzunderungs-Schritt, in dem Entzundern an einer Oberfläche des Stahlblechs zweimal oder häufiger zwischen dem Warmkorrektur-Schritt und dem Schritt zum beschleunigten Abkühlen durchgeführt wird, so dass Energiedichte E von Entzunderungs-Wasser insgesamt 0,08 J/mm2 oder mehr beträgt, wobei Strahldüsen einer Entzunderungs-Vorrichtung in zwei oder mehr Reihen in Bezug auf eine Längsrichtung des Stahlblechs angeordnet sind,
    die Energiedichte des Entzunderungs-Wassers, das über die Strahldüsen der Entzunderungs-Vorrichtung in einer Reihe unmittelbar vor der letzten Reihe ausgestrahlt wird, 0,01 J/mm2 oder mehr beträgt, und
    die Energiedichte des Entzunderungs-Wassers, das über die Strahldüsen der Entzunderungs-Vorrichtung in der letzten Reihe ausgestoßen wird, um 0,04 J/mm2 oder mehr größer ist als die Energiedichte des Entzunderungs-Wassers, das über die Strahldüsen der Entzunderungs-Vorrichtung in der Reihe unmittelbar vor der letzten Reihe ausgestoßen wird.
  2. Verfahren zum Herstellen einer Stahlplatte nach Anspruch 1, bei dem zwischen dem Warmkorrektur-Schritt und dem Schritt zum beschleunigten Abkühlen Entzundern an einer Oberfläche der Stahlplatte zweimal durchgeführt wird.
  3. Verfahren zum Herstellen eines Stahlblechs nach Anspruch 1 oder 2,
    wobei für eine Zeit t [s] von Abschluss des Entzunderungs-Schritts bis zum Beginn des Schritts zum beschleunigten Abkühlen Ausdruck t ≤ 5 × 10 -9 × exp(25000/T) gilt,
    wobei T (K): Temperatur des Stahlblechs vor Abkühlen.
EP15836765.6A 2014-08-26 2015-08-14 Verfahren zur herstellung dicker stahlplatten Active EP3195946B1 (de)

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JP2014171045 2014-08-26
PCT/JP2015/004055 WO2016031168A1 (ja) 2014-08-26 2015-08-14 厚鋼板の製造設備および製造方法

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JPS5970418A (ja) * 1982-10-13 1984-04-20 Sumitomo Metal Ind Ltd 熱間圧延デスケ−ラ−の運転制御方法
JPH0957327A (ja) 1995-08-22 1997-03-04 Sumitomo Metal Ind Ltd 厚鋼板のスケール除去方法
JP3796133B2 (ja) 2000-04-18 2006-07-12 新日本製鐵株式会社 厚鋼板冷却方法およびその装置
JP2003181522A (ja) * 2001-12-14 2003-07-02 Nippon Steel Corp 表面性状の優れた鋼板の製造方法及びその装置
JP5614040B2 (ja) * 2009-03-25 2014-10-29 Ｊｆｅスチール株式会社 厚鋼板の製造設備及び製造方法
JP5640614B2 (ja) * 2010-09-30 2014-12-17 Ｊｆｅスチール株式会社 ラインパイプ用高強度鋼板及びその製造方法並びにラインパイプ用高強度鋼板を用いた高強度鋼管
JP5764936B2 (ja) * 2011-01-24 2015-08-19 Ｊｆｅスチール株式会社 厚鋼板のデスケーリング設備およびデスケーリング方法
CN102756002B (zh) * 2011-04-28 2015-08-26 宝山钢铁股份有限公司 一种射流连续除鳞的方法

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KR20170036003A (ko) 2017-03-31
EP3195946A1 (de) 2017-07-26
EP3195946A4 (de) 2017-09-06
JP6264464B2 (ja) 2018-01-24
BR112017003566A2 (pt) 2017-12-05
BR112017003566B1 (pt) 2022-12-06
WO2016031168A1 (ja) 2016-03-03
JPWO2016031168A1 (ja) 2017-04-27
CN106794500B (zh) 2020-01-31
KR101940428B1 (ko) 2019-01-18
CN106794500A (zh) 2017-05-31

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