EP3653312A1 - Anlage zur herstellung von stahlplatten und verfahren zur herstellung von stahlplatten - Google Patents

Anlage zur herstellung von stahlplatten und verfahren zur herstellung von stahlplatten Download PDF

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Publication number
EP3653312A1
EP3653312A1 EP18861857.3A EP18861857A EP3653312A1 EP 3653312 A1 EP3653312 A1 EP 3653312A1 EP 18861857 A EP18861857 A EP 18861857A EP 3653312 A1 EP3653312 A1 EP 3653312A1
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EP
European Patent Office
Prior art keywords
steel plate
correction device
shape correction
steel
roller
Prior art date
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Granted
Application number
EP18861857.3A
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English (en)
French (fr)
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EP3653312A4 (de
EP3653312B1 (de
Inventor
Satoshi Ueoka
Masayuki Horie
Yuta Tamura
Kenji Adachi
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JFE Steel Corp
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JFE Steel Corp
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Publication date
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Publication of EP3653312A4 publication Critical patent/EP3653312A4/de
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Publication of EP3653312B1 publication Critical patent/EP3653312B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0269—Cleaning
    • B21B45/0275—Cleaning devices
    • B21B45/0278—Cleaning devices removing liquids
    • B21B45/0281—Cleaning devices removing liquids removing coolants
    • 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
    • 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
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0071—Levelling the rolled product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • 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
    • B21B39/006—Pinch roll sets

Definitions

  • the present invention relates to a steel-plate manufacturing facility for cooling on-line a hot steel plate that has undergone hot rolling to obtain a high-quality product, and a method for manufacturing a steel plate, and particularly, to a steel-plate manufacturing facility for manufacturing a highly flat steel plate, and a method for manufacturing a steel plate.
  • Controlled rolling to perform rolling, within a low temperature range or accelerated cooling to cool the rolled steel plates has been performed on-line, particularly for thick steel plates in these years.
  • highly accurate temperature control particularly, highly accurate cooling-stop temperature control has been increasingly important.
  • cooling variation is likely to be caused while undergoing cooling due to the temperature distribution variation or the variation in shape or in surface state of the steel plate immediately after undergoing rolling.
  • cooling variation that occurs in a thick steel plate having a relatively large thickness is more likely to attribute to the performance of a cooling device.
  • Cooling variation caused in a thick steel plate causes deformation, residual stress, variations in quality or the like in the thick steel plate.
  • shape defect of a cooled steel plate causes operation troubles such as plate passage troubles in a manufacturing line, or requires correction in the subsequent process with a press or a correction device, and thus raises costs.
  • Causes of cooling variation of a steel plate include those attributable to the characteristics of a cooling nozzle, such as the temperature variation of the upper and lower surfaces or widthwise temperature uniformity, and those attributable to the shape of the steel plate before undergoing cooling.
  • a first method is to perform shape correction in front of an accelerated cooling device to flatten the shape for uniform cooling during cooling.
  • Patent Literature 1 describes correction of the shape of a steel plate with a first shape correction device to such an extent that dewatering rollers of the cooling device can fully drain the steel plate.
  • Patent Literature 2 describes determination of the distance from the exit of a shape correction device to the entrance of a cooling device to prevent a flattening failure after cooling due to heat recuperation of a steel plate.
  • a second method is to restrict a steel plate with dewatering rollers.
  • the dewatering rollers have two functions of 1) flattening a steel plate with pressure of the rollers and 2) preventing cooling water sprayed onto a cooling area from leaking to the outside.
  • Patent Literature 3 is a technology which includes dewatering rollers capable of individually rising and falling vertically and the rollers move upwards and downwards following the profile of a steel plate.
  • Patent Literature 4 is a technology of pressing a steel plate with dewatering rollers with a predetermined load or higher to flatten the deformed steel plate to a predetermined level so as to effectively block the cooling water with reduction of gaps between the steel plate and the rollers.
  • a steel plate is more likely to have shape defect attributable to rolling particularly in a thin thickness area susceptible to shape defect, such as an area having a small thickness (for example, smaller than or equal to 30 mm) and a large width (for example, greater than or equal to 3000 mm).
  • a thin thickness area susceptible to shape defect such as an area having a small thickness (for example, smaller than or equal to 30 mm) and a large width (for example, greater than or equal to 3000 mm).
  • the dewatering rollers are more likely to fail to appropriately come into contact with the steel plate to block the cooling water, thus allow the cooling water to leak out from the cooling water spray area on the upper surface of the steel plate, and cause supercooling and shape defect attributable to temperature variation.
  • the present invention has been made in view of the above circumstances, and aims to provide a steel-plate manufacturing facility capable of manufacturing a flat steel plate with a uniform quality by uniformly cooling a hot steel plate through on-line cooling, and a method for manufacturing a steel plate.
  • highly flat steel plates can be manufactured by flattening the shape of the steel plates with a first shape correction device preferably to or below predetermined steepness, and then appropriately restraining the steel plates with dewatering rollers in an accelerated cooling device.
  • the gist of the present invention is as follows.
  • flat steel plates with a uniform quality can be manufactured by uniformly cooling hot steel plates through on-line cooling.
  • a manufacturing facility includes a hot rolling mill 1, a first shape correction device 2, an accelerated cooling device 3, and a second shape correction device 4, arranged in this order.
  • a steel plate 5 undergoes rolling with the hot rolling mill 1, subsequent shape correction with the first shape correction device 2, control cooling with the accelerated cooling device 3, and, as appropriate, shape correction with the second shape correction device 4.
  • the arrow in Fig. 1 indicates the transport direction of the steel plate.
  • Fig. 2 is a schematic diagram illustrating how the steel plate 5 passes through the first shape correction device 2 and the accelerated cooling device 3.
  • the steel plate 5 that has undergone rolling with the hot rolling mill 1 is more likely to have shape defect such as edge wave.
  • the steel plate 5 undergoes control cooling with the accelerated cooling device 3.
  • the accelerated cooling device 3 includes dewatering rollers 31, which restrict the steel plate 5 from above and below, cooling nozzles 32, which allow cooling water to be sprayed therethrough, and pressing-load control systems 33, which control the pressing load P of the dewatering rollers 31.
  • the cooling nozzles 32 may be arranged between the dewatering rollers 31.
  • Fig. 3 is a schematic diagram of gaps between the steel plate 5 and the dewatering rollers 31.
  • the steel plate has a non-flat shape (for example, concave downward in the steel plate width direction)
  • the steel plate 5 is pressed against the dewatering rollers 31 while being deformed.
  • the dewatering rollers 31 fail to flatten the steel plate 5 that is concave downward as illustrated in Fig. 3(a) , and leave gaps between the steel plate 5 and themselves.
  • the pressing load of the dewatering roller 31 is excessive, the dewatering rollers 31 bend and form gaps between the steel plate 5 and themselves ( Fig. 3(b) ).
  • Fig. 4 is a graph illustrating the relationship between the pressing load from dewatering rollers with a roller diameter of 300 mm (solid roller) and a body length of 6 m exerted on a steel plate with a plate width of 4000 mm and deflection of the dewatering rollers. Deflection is measured by a clearance gauge. It is assumed that a gap of at least approximately 1 mm or smaller is required to appropriately block water with the dewatering rollers.
  • each dewatering roller When the pressing load exceeds several tens of tons, the dewatering rollers deflect more than 1 mm, and when loaded with approximately a hundred tons, each dewatering roller causes a gap of approximately 6 mm, and can no longer exert its function as a dewatering roller.
  • the steel plates have a plate thickness of 30 mm, a plate width of 3500 mm, and a temperature of 850°C.
  • the shape of each steel plate after passing through the first shape correction device 2 is quantified using steepness ⁇ (%), expressed in Fig. 5 and with the definition of the following formula (2), and controlled as appropriate with the pressing amount of the first shape correction device 2.
  • Fig. 6 is a graph illustrating the steepness and the pressing load with or without cooling water leakage where the roller diameter is 400 ⁇ .
  • circles denote the cases where water did not leak between the steel plate and the rollers, and crosses denote the cases where water leaked between the steel plate and the rollers. The cooling water leakage was visually confirmed.
  • Fig. 6 reveal that the steel plate 5 needs to be flattened to a certain level before being transported into the accelerated cooling device 3, and needs to receive a predetermined pressing load.
  • which level of the pressing load is preferable is studied on the basis of the finding that an excessively large pressing load bends the rollers.
  • the inner diameter d of the dewatering roller 31 may be defined as 0. It is conceived from the above formula that the deflection amount ⁇ of the dewatering roller 31 attributable to the width of the steel plate 5 or the dimensions of the dewatering roller 31 is in proportional to the following parameters: [Math 3] ⁇ ⁇ L ⁇ W W 2 D 4 ⁇ d 4
  • Each of the steel plates had a plate thickness of 30 mm, and a plate width of 2500 mm, 3500 mm, or 5000 mm, and the dewatering rollers, regardless of solid rollers or hollow rollers, had a diameter of 400 mm (the inner diameter of hollow rollers is 32 mm with a thickness of 40 mm), and a roller body length of 6000 mm. Whether the cooling water leakage occurred or not was visually confirmed, and the case where water leakage between the steel plate and the rollers occurred was determined as cooling water leakage (cross, denoting poor) occurring.
  • Fig. 8 is a graph illustrating the effect of the pressing load of the dewatering rollers 31 and the deflection parameter, on whether cooling water leakage occurs passing by the dewatering rollers 31.
  • the graph shows that a larger deflection parameter causes cooling water leakage with a lower pressing load.
  • the pressing load P satisfies the formula (1), below, in accordance with the plate width of W, so that the dewatering rollers 31 are prevented from being deflected, and can secure preferable draining performance: P ⁇ 37 ⁇ L ⁇ W ⁇ W 2 / D 4 ⁇ d 4 ⁇ 1.25 where
  • the lower limit of the pressing load P is preferably higher than or equal to 1.0 ton from the viewpoint of flattening distortion slightly left in the steel plate forced by the roller leveler to the minimum drainable level with the pressing force of the dewatering rollers.
  • the first shape correction device 2 may be either a press-down skin pass leveler or a roller leveler for repeated bending.
  • the steel plate 5 when the leading end portion of the steel plate 5 causes warpage, the steel plate 5 may fail to be inserted between the dewatering rollers 31 of the accelerated cooling device 3.
  • the leading end portion of the steel plate 5 preferably undergoes correction with the roller leveler capable of performing repeated bending and exerting a higher correction performance than the skin pass leveler that has a lower correction performance on the longitudinal warpage that occurs in the trailing end portion of the steel plate 5.
  • the steepness of the steel plate 5 is preferably corrected to below 2.0%. More preferably, the steepness is corrected to below 1.0%.
  • the accelerated cooling device 3 is not suitable for regulating the flow rate in the steel plate width direction to make the flow rate completely uniform.
  • the temperature variation during controlled cooling may thus cause slight warpage, so that, preferably, the second shape correction device 4 further corrects the steel plate 5 after the controlled cooling of the accelerated cooling device 3.
  • a roller leveler capable of performing repeated bending is preferably used as the second shape correction device 4 for correction.
  • Each dewatering roller 31 may have either a hollow structure or a solid structure.
  • a solid structure solid roller is more preferable, since the roller preferably has higher rigidity.
  • the solid structure can also reduce an additional pressing load, such as a hydraulic pressure, using the weight of the dewatering rollers.
  • the cooling nozzles 32 are not limited to particular nozzles. Usable examples include multiple cylindrical jet nozzles, slit nozzles, a spray nozzle that sprays water alone, such as a flat spray, a corner spray, a full cone spray, or an oval spray, or a mist spray nozzle that mixes water and air with the same shape.
  • the pressing-load control systems 33 may be any system that can apply a predetermined pressure such as a spring, a pneumatic pressure or a hydraulic pressure. In the present invention, it is important that the pressing-load control systems 33 retain such a pressing load that the dewatering rollers 31 are not bent. Thus, a control system that can retain a predetermined pressing force is preferable. However, in the case of a spring system, the pressing amount of the spring changes in accordance with the shape of the steel plate 5, and thus, the pressing load also changes to a large extent. Thus, in the case of a spring control system, the steel plate needs to have low steepness (preferably, lower than 1.0%) in the shape correction of the steel plate with the first shape correction device 2. Thus, a control system using a hydraulic pressure or a pneumatic pressure that promisingly has a predetermined pressing load is preferable.
  • the present invention is applied to a steel plate having a plate thickness of smaller than or equal to 30 mm and/or a plate width of greater than or equal to 3000 mm, and is capable of reducing occurrence of shape defect attributable to rolling.
  • Steel plates were manufactured by the manufacturing facility illustrated in Fig. 1 .
  • Steel plates 5 with a plate thickness of 25 mm and a plate width of 3500 mm were manufactured by the hot rolling mill 1, then had their shapes corrected by the first shape correction device 2 to have predetermined steepness, and transported to the accelerated cooling device 3.
  • the steepness of the steel plates 5 was controlled by adjusting the press-down settings of the first shape correction device 2.
  • the steel plates 5 were corrected by the second shape correction device 4.
  • the steel plates 5 had distortion after being corrected by the second shape correction device 4
  • the steel plates 5 underwent re-correction by the cold-rolling correction device.
  • an example used as the accelerated cooling device 3 includes ten units arranged in the travel direction of the steel plates 5, each unit including dewatering rollers 31, cooling nozzles 32 arranged between the dewatering rollers 31, and pressing-load control systems 33.
  • the pressing-load control systems 33 were pneumatic pressure systems.
  • the dewatering rollers 31 were hollow rollers with a body length of 6000 mm, a roller outer diameter of 400 mm, and a roller inner diameter of 320 mm.
  • the steel plates having a temperature variation within 25°C in the steel-plate width direction were determined as acceptable.
  • the material having a temperature variation exceeding 25°C underwent re-correction with the cold-rolling correction device to such a level that satisfies predetermined production specifications.
  • Examples 1 to 2 are examples where the dewatering rollers 31 have a pressing load of 10 tons, which is smaller than or equal to the pressing load P (15.3 tons) expressed with Formula (1) in the present invention.
  • Examples 1 and 2 respectively have a steepness of 0.75% and 1.5%, and a temperature variation in the width direction of 12°C and 22°C, which fall within the acceptable range.
  • the steel plates After being corrected by the second shape correction device 4, the steel plates remained flat without the need of re-correction. In the mechanical test, the tensile strength was satisfactory without variation.
  • the steel plate of Example 1 having smaller steepness has better temperature variation.
  • Comparative examples 2 to 4 are examples where the dewatering rollers 31 have a pressing load of 30 tons, which is larger than the pressing load P (15.3 tons) expressed by Formula (1) of the present invention.
  • the dewatering rollers 31 have a pressing load of 30 tons, which is larger than the pressing load P (15.3 tons) expressed by Formula (1) of the present invention.
  • large temperature variation 58 to 72°C
  • a large amount of accumulated water was observed on the steel plate, particularly, at the center in the width direction. This probably results from a failure of blocking the cooling water with the dewatering rollers 31. Accumulated water is left at the center in the width direction, which has probably caused large temperature variation.
  • the steel plates of Comparative Examples 2 to 4 have large distortion after being corrected by the second shape correction device 4, and required re-correction with the cold-rolling correction device, which caused additional manufacturing costs. Moreover, mechanical tests conducted on the steel plates of comparative examples 2 to 4 revealed large variation in tensile strength.
  • the examination was conducted for steel plates with a plate thickness of 30 mm and a plate width of 2000 mm and 5000 mm.
  • steel plates having a widthwise temperature variation within 25°C in the plate width direction were regarded as acceptable.
  • the material having a temperature variation exceeding 25°C underwent re-correction by the cold-rolling correction device.
  • Table 2 shows the results.
  • Steel plate Thickness (mm) Steel plate Width (mm) Steepness (%) Pressing Load (ton) of Dewatering rollers Pressing Load P (ton) of Formula 1 Temperature Deviation after Cooling (°C) Re-correction Example 3 30 2000 0.75 30 34.5 18 Not Needed Comparative Example 5 30 2000 0.75 50 34.5 100 Needed Example 4 30 5000 0.75 15 19.7 10 Not Needed Comparative Example 6 30 5000 0.75 30 19.7 40 Needed P 37 ⁇ L ⁇ W ⁇ W 2 / D 4 ⁇ d 4 ⁇ 1.25
  • Example 3 is the example where the dewatering roller 31 has a pressing load of 30 tons, which is smaller than the pressing load P (34.5 tons) expressed by Formula (1) of the present invention.
  • Example 3 has a temperature variation in the width direction of 18°C, which is small to fall within the acceptable level, without the need of correction by the second shape correction device 4. In observation during the examination, Example 3 caused no accumulated water.
  • Comparative Example 5 is an example where the dewatering rollers have the same width as Example 3 and a pressing load of 50 tons, which is greater than the pressing load P (34.5 tons) expressed by Formula (1) of the present invention. In Comparative Example 5, large temperature variation (100°C) occurred in the plate width direction.
  • Example 4 is the example where the dewatering rollers 31 have a pressing load of 15 tons, which is smaller than the pressing load P (19.7 tons) expressed by Formula (1) of the present invention.
  • Example 4 had a temperature variation in the width direction of 10°C, which is preferable, and retained the flat shape also after being corrected by the second shape correction device 4.
  • temperature variation was 100°C and a large supercooling occurred.
  • Comparative Example 6 a large amount of accumulated water was observed on the steel plate, particularly, at the center in the width direction. This probably results from a failure of blocking the cooling water with the dewatering rollers 31.
  • the steel plate of Comparative Example 6 had large distortion after being corrected by the second shape correction device 4, and required re-correction with the cold-rolling correction device, which caused additional manufacturing costs. Moreover, mechanical tests revealed large variation in tensile strength.
  • the above examination reveals that, restraining the steel plate with a predetermined pressing load with the dewatering rollers concurrently with flattening of the steel plate enables uniformization of the temperature distribution of the steel plate to obtain a highly flat steel plate, and that changing of the pressing load as appropriate in accordance with the plate width enables uniformization of the temperature distribution of the steel plate to manufacture a highly flat steel plate.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Metal Rolling (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP18861857.3A 2017-09-28 2018-09-18 Anlage zur herstellung von stahlplatten und verfahren zur herstellung von stahlplatten Active EP3653312B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017187298 2017-09-28
PCT/JP2018/034420 WO2019065360A1 (ja) 2017-09-28 2018-09-18 鋼板の製造設備および鋼板の製造方法

Publications (3)

Publication Number Publication Date
EP3653312A1 true EP3653312A1 (de) 2020-05-20
EP3653312A4 EP3653312A4 (de) 2020-07-29
EP3653312B1 EP3653312B1 (de) 2022-08-17

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EP18861857.3A Active EP3653312B1 (de) 2017-09-28 2018-09-18 Anlage zur herstellung von stahlplatten und verfahren zur herstellung von stahlplatten

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Country Link
EP (1) EP3653312B1 (de)
JP (1) JP6521193B1 (de)
KR (1) KR102325649B1 (de)
CN (1) CN111194245B (de)
RU (1) RU2741033C1 (de)
WO (1) WO2019065360A1 (de)

Cited By (1)

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EP4066956A4 (de) * 2019-11-25 2023-01-11 JFE Steel Corporation Fertigungsanlage und verfahren zur herstellung einer stahlplatte

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CN111604697B (zh) * 2020-05-31 2021-05-14 日照宝华新材料有限公司 一种薄规格低碳钢横折缺陷的控制方法
CN115945749A (zh) * 2022-12-31 2023-04-11 广州市德固制冷设备有限公司 一种金属板材加工系统及方法

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BR112020006034A2 (pt) 2020-10-06
WO2019065360A1 (ja) 2019-04-04
EP3653312A4 (de) 2020-07-29
JPWO2019065360A1 (ja) 2019-11-14
KR102325649B1 (ko) 2021-11-11
EP3653312B1 (de) 2022-08-17
JP6521193B1 (ja) 2019-05-29
RU2741033C1 (ru) 2021-01-22
KR20200045531A (ko) 2020-05-04
CN111194245A (zh) 2020-05-22
CN111194245B (zh) 2022-03-01

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