EP3560616B1 - Verfahren zur kühlung von stahlblech und verfahren zur herstellung von stahlblech - Google Patents

Verfahren zur kühlung von stahlblech und verfahren zur herstellung von stahlblech Download PDF

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Publication number
EP3560616B1
EP3560616B1 EP18760481.4A EP18760481A EP3560616B1 EP 3560616 B1 EP3560616 B1 EP 3560616B1 EP 18760481 A EP18760481 A EP 18760481A EP 3560616 B1 EP3560616 B1 EP 3560616B1
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Prior art keywords
plate
cooling
steel
steel plate
formula
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English (en)
French (fr)
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EP3560616A1 (de
EP3560616A4 (de
Inventor
Satoshi Ueoka
Yuuta TAMURA
Naoki Harada
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JFE Steel Corp
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JFE Steel Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/06—Product speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B21B37/76—Cooling control on the run-out table

Definitions

  • the present invention relates to controlled cooling in which a hot-rolled high-temperature steel plate in a state of being constrained by rolls is subjected to passage-cooling.
  • the present invention relates, in particular, to a steel-plate cooling method and a steel-plate manufacturing method that are capable of manufacturing a thick steel plate (hereinafter, also simply referred to as the steel plate) having a thin plate thickness of 10 mm or less and a plate width of 3000 mm or more with a less distortion.
  • existing cooling of steel plates commonly employs a technique (known as passage-cooling) in which a steel plate is constrained by a plurality of rolls, a cooling nozzle is disposed between the constraining rolls, and the steel plate is cooled while being passed therethrough, thereby manufacturing a steel plate with a less distortion.
  • passage-cooling a technique in which a steel plate is constrained by a plurality of rolls, a cooling nozzle is disposed between the constraining rolls, and the steel plate is cooled while being passed therethrough, thereby manufacturing a steel plate with a less distortion.
  • passage-cooling enables cooling to be performed in short-length equipment and thus enables initial investment costs to be suppressed.
  • the constraining rolls suppress generation of a distortion caused by nonuniformity of temperature distribution on upper and lower surfaces of a steel plate under cooling and in the surfaces of the steel plate, and the cooling nozzle that is disposed between the rolls suppresses a cooling water from being placed outside a cooling apparatus, thereby preventing the cooling water from remaining on the steel plate.
  • Patent Literature 1 describes a method of determining whether straightening is required for a shape defect caused by nonuniformity of temperature distribution in a steel plate after cooling by estimating residual stress generated in the steel plate on the basis of measurement of temperature distribution in the steel plate after cooling.
  • Patent Literature 2 focuses on constraining rolls and describes a method of manufacturing a steel plate having excellent flatness by applying a load within a range of constraining force of the constraining rolls required as a function for the roll pitch thereof and the thickness of a steel plate.
  • Patent Literature 3 discloses a cooling device for a thick steel plate, the cooling device having a plurality of pairs of constraining rolls.
  • Patent Literature 2 it is possible to suppress distortions due to a temperature deviation between upper and lower surfaces; however, an effect is not exerted for a region having a thin plate thickness and a wide plate width because buckling strains due to contraction in the plate width during water-cooling is not considered.
  • an object of the present invention is to provide a steel-plate cooling method with a less distortion and a steel-plate manufacturing method in controlled cooling in which a hot-rolled steel plate is cooled while being constrained by rolls.
  • manufacture of a steel plate with a less distortion is enabled.
  • the present invention is capable of exerting the effect thereof by being applied, in particular, to off-line heat treatment of a thick steel plate.
  • Fig. 1 is a schematic view illustrating a configuration of part of manufacturing equipment that use a steel-plate cooling apparatus.
  • a steel plate 1 manufactured in a rolling mill line and having a predetermined plate thickness is conveyed to a manufacturing line in Fig. 1 .
  • the steel plate 1 is heated by a heating furnace 10 to a predetermined temperature, the steel plate 1 is conveyed while being constrained by a plurality of rolls 2, and cooling of the steel plate 1 is performed by using a plurality of cooling nozzles 3 that are each set between rolls 2.
  • the rolls 2 and the cooling nozzles 3 are set at upper and lower surfaces of the steel plate 1.
  • the cooling apparatus includes the rolls 2, the cooling nozzles 3, and a control mechanism (not illustrated) that controls a plate passage speed V to satisfy a formula (1), which is described below.
  • Fig. 2(a) is a schematic view illustrating a configuration of the steel-plate cooling apparatus.
  • the steel plate 1 is constrained at the upper and lower surfaces thereof by the plurality of rolls 2, such as rolls 2-0, rolls 2-1, ... rolls 2-i, and rolls 2-n, in the conveying direction.
  • the cooling nozzles 3 are each set between the rolls 2 so as to be at the upper and lower surfaces of the steel plate 1.
  • Fig. 2(b) is a view describing a change in the plate width W of a steel plate during cooling of the steel plate and is a top view of the change in the plate width W of the steel plate 1 during passage in the steel-plate cooling apparatus illustrated in Fig. 2(a) .
  • the plate width of the steel plate 1 during passage through the rolls 2 is represented by W
  • a roll pitch in the steel-plate conveying direction is represented by L.
  • the steel plate 1 contracts due to water-cooling.
  • a portion having a wide plate width (for example, the plate width W 0 ) is subjected to large compressive stress because the portion is in a state identical to a state in which a steel plate having a wide plate width and a steel plate having a narrow plate width are joined to each other so as to have the same width.
  • a strain of the steel plate due to the compressive stress is referred to as a buckling strain in the present invention.
  • Fig. 3 is a view of an example illustrating the shape of a steel plate in which a shape defect is generated.
  • a shape defect which is known as edge waves, was generated in edge portions of the steel plate 1.
  • the defect of wave-shaped edges was quantified using the steepness ⁇ (%) represented with the definitions indicated in Fig. 4 and in the formula (2) below.
  • Edge waves are not generated at one location; a plurality of edge waves are generated at both end portions of a steel plate.
  • the value of ⁇ /P in the formula (2) below is an average value of all edge waves generated at both end portions of the steel plate.
  • ⁇ ⁇ / P ⁇ 100 Note that, in the formula (2),
  • the wave pitch P of the steel plate in which a shape defect is generated was approximately 0.6 to 1.4 m.
  • the steepness it is preferable that the steepness be small as much as possible because, for example, presence of large shape defects during welding of a plurality of plates generates work of, for example, performing the welding in a state in which strains included in the steel plates are constrained and flattened.
  • the wave height ⁇ is required to be set to 10 mm or less.
  • the cooling speed Cv is the cooling speed with respect to an average temperature in the plate thickness direction.
  • compressive stress applied to the steel plate in the width direction is derived from an inter-rolls input temperature and an inter-rolls output temperature and can be described as follows.
  • the buckling coefficient k has a process-specific value; therefore, the buckling coefficient k was actually obtained through various experiments in an actual apparatus.
  • the plate thickness t of 5 to 15 mm, the plate width W of 3000 to 5000 mm, the roll pitch L of 500 to 750 mm, and the plate passage speed of 0.3 to 2.0 m/s were set as experimental conditions.
  • the buckling constant k at a border at which a buckling is actually generated is considered, from the formula (4) above, to relate to the square of the roll pitch L and the plate width W.
  • the buckling coefficient k may be deviated from the theoretical formula of the formula (4) depending on constrain of each end portion, strain conditions, and the like; therefore, there is an example in which a member of (W/L) is omitted when, for example, shearing force is present. Accordingly, a relationship between the buckling coefficient k actually obtained in an actual apparatus with the member of (W/L) omitted and the square of the roll pitch L and the plate width W is plotted. Results thereof are indicated in Fig. 9 . In Fig.
  • O indicates that the steepness ⁇ is less than 0.5%
  • ⁇ indicates that the steepness ⁇ is 0.5% or more. From Fig. 9 , a correlation is considered to be present between the buckling constant k at a border at which a buckling is actually generated and the steepness ⁇ .
  • the plate passage speed V at which no buckling is generated can be represented by the formula (1) below.
  • the roll pitch L is a parameter derived from a mechanical configuration and is thus a parameter that is not changeable after mechanical equipment installation.
  • the plate thickness t, the plate width W, and the cooling speed Cv are parameters relating to determination of characteristics of a commodity and are thus also not simply changeable.
  • the plate passage speed V which is a parameter changeable as appropriate, is focused to arrange the formula (1).
  • the plate passage speed V required for cooling to prevent a buckling strain from being generated increases.
  • the roll pitch L, the cooling speed Cv, and the plate passage speed V are values specific to a cooling apparatus, and the plate thickness t and the plate width W are determined in accordance with a product.
  • the cooling speed Cv is a flow rate of a cooling water of the cooling apparatus
  • the plate passage speed V is the number of rotations of table rolls
  • both the cooling speed Cv and the plate passage speed V are changeable.
  • the roll pitch of the cooling apparatus is previously designed in a designing step in accordance with the range of manufacturing varieties so as to be as short (for example, a pitch of 500 mm) as possible, the number of rotations of the table rolls is set to a value such that the table rolls rotate as fast (for example, to 2 m/s or more) as possible, and the adjustment range of the flow rate of the cooling water is also designed to be wide.
  • the roll pitch L for example, when an existing apparatus is utilized, reducing the cooling speed Cv by widening the adjustment range of the flow rate of the cooling water to enable cooling to be performed at a small flow rate is effective (for example, 100°C/s or less with the plate thickness of 10 mm).
  • the plate passage speed is approximately 2.5 m/s, which is relatively fast, with the plate thickness of 10 mm. Thus, such a buckling strain is not easily generated.
  • water-cooling is performed in interlock with the extraction rate of a heating furnace, and the plate passage speed is thus approximately 1.0 m/s, which causes a buckling strain such as that described in the present invention to be generated easily.
  • the present invention is capable of manufacturing a steel plate with a less cooling-distortion by cooling the steel plate at the plate passage speed V that satisfies the formula (1) above.
  • the present invention exerts an effect with respect to a steel plate that has a thin plate thickness and a wide plate width.
  • the present invention is suitable for cooling of a thick steel plate that has a plate thickness of 10 mm or less and/or a plate width of 3000 mm or more and is applicable to off-line heat treatment of thick steel plates.
  • a steel plate was cooled using the manufacturing equipment illustrated in Fig. 1 .
  • the heating temperature in the heating furnace 10 was set to 930°C, and the plate thickness was set to 5 mm, 10 mm, and 12 mm, which is a plate thickness with which a buckling strain is easily generated.
  • a plurality of flat sprays arranged adjacent to each other in the width direction were used as the cooling nozzles 3.
  • the amount of the cooling water was changeable, the cooling speed for a thick steel plate having a plate thickness of 5 mm when a maximum amount of water is jetted was 400°C/s, and the cooling speed when a minimum amount of water is jetted was 100°C/s.
  • the cooling speed is in inverse proportion to the plate thickness. Therefore, when the plate thickness is 10 mm, the maximum cooling speed is 200°C/s and the minimum cooling speed is 50°C/s.
  • the roll pitch L was changed for each condition.
  • each steel plate was determined on the basis of the steepness ⁇ .
  • the shape of the steel plate was determined to be flat, and, when the steepness ⁇ was 0.5% or more, the shape of the steel plate was determined to include a buckling strain.
  • ⁇ /P was calculated from an average value of all of edge waves generated at both end portions of the steel plate.
  • cooling was performed at a plate passage speed faster than the plate passage speed V obtained by the formula (1).
  • no buckling strain was generated, and the shape was flat.
  • cooling was performed at a plate passage speed slower than the plate passage speed V obtained by the formula (1).
  • a buckling strain was generated under each of the conditions.
  • Control of the conveying speed of a general off-line heat treatment apparatus of thick steel plates is affected by a drive mechanism of a heating furnace, and speed control of approximately 0.02 to 0.5 m/s is generally possible for the conveying speed.
  • shape adjustment is easy, in particular, under the experimental condition of the plate thickness of 12 mm, because the plate passage speed, that is, the conveying speed, obtained by the formula (1) of the present invention falls within the conveying-speed control range of the actual apparatus, even when the cooling speed is fast.
  • Shape adjustment of the steel plates having a narrow plate width is also easy because the plate passage speed, that is, the conveying speed, similarly obtained by the formula (1) of the present invention falls within the conveying-speed control range of the actual apparatus.
  • the plate passage speed that is, the conveying speed, obtained by the formula (1) of the present invention is sometimes out of the conveying-speed control range of the actual apparatus.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Metal Rolling (AREA)

Claims (3)

  1. Verfahren zum Kühlen von Stahlplatten, bei dem eine Stahlplatte in einem Zustand befördert wird, bei dem sie durch eine Vielzahl von Walzen eingespannt ist, die in einem vorbestimmten Abstand in einer Stahlplatten-Förderrichtung angeordnet sind, und bei dem die Stahlplatte gekühlt wird, indem ein Kühlwasserstrahl auf die obere und untere Oberfläche der Stahlplatte unter Verwendung von Kühldüsen gerichtet wird, die zwischen der Vielzahl von Walzen angeordnet sind,
    wobei die Kühlung bei einer Plattendurchlaufgeschwindigkeit V erfolgt, die die nachstehende Formel (1) erfüllt: V > 2,21 × 10 − 5 × Cv × L 3 × t − 2 × 24,2 + 204,3 × L / W 2 − 1
    Figure imgb0017
     wobei in Formel (1) gilt:
    V: Plattendurchlaufgeschwindigkeit (m/s),
    Cv: Kühlgeschwindigkeit (°C/s), bezogen auf eine durchschnittliche Temperatur der Stahlplatte in einer Richtung der Plattendicke,
    L: Walzenabstand (m),
    t: Plattendicke (m), und
    W: Plattenbreite (m),
    wobei
    die Plattendicke t 10 mm oder weniger beträgt und wobei die gekühlte Stahlplatte eine Steilheit λ von weniger als 0,5 % aufweist, wobei die Steilheit λ die nachstehende Formel (2) erfüllt: λ = δ / P × 100
    Figure imgb0018
     wobei in Formel (2) gilt:
    λ: Steilheit (%),
    δ: Wellenhöhe (m) und
    P: Wellenabstand (m),
    wobei (δ/P) in Formel (2) ein Durchschnittswert aller Kantenwellen ist, die an beiden Enden der Stahlplatte erzeugt werden.
  2. Kühlverfahren für Stahlplatten nach Anspruch 1, wobei die Plattenbreite W 3000 mm oder mehr beträgt.
  3. Verfahren zur Herstellung von Stahlplatten, bei dem eine warmgewalzte Stahlplatte unter Verwendung des Stahlplattenkühlverfahrens nach Anspruch 1 oder 2 gekühlt wird, wodurch eine Stahlplatte hergestellt wird.
EP18760481.4A 2017-03-02 2018-03-01 Verfahren zur kühlung von stahlblech und verfahren zur herstellung von stahlblech Active EP3560616B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017038973A JP6720894B2 (ja) 2017-03-02 2017-03-02 鋼板の冷却方法および鋼板の冷却装置ならびに鋼板の製造方法
PCT/JP2018/007743 WO2018159749A1 (ja) 2017-03-02 2018-03-01 鋼板の冷却方法および鋼板の冷却装置ならびに鋼板の製造方法

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EP3560616A1 EP3560616A1 (de) 2019-10-30
EP3560616A4 EP3560616A4 (de) 2020-01-15
EP3560616B1 true EP3560616B1 (de) 2023-01-25

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KR (1) KR102303872B1 (de)
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KR102430332B1 (ko) * 2017-10-31 2022-08-05 제이에프이 스틸 가부시키가이샤 후강판의 제조 설비 및 제조 방법
JP7076323B2 (ja) * 2018-07-31 2022-05-27 株式会社ユニバーサルエンターテインメント 遊技機
CN109794506B (zh) * 2019-04-04 2023-10-24 哈尔滨工业大学（威海） 一种热成形钢板辊压成形装置及方法
JP7173377B2 (ja) * 2019-11-25 2022-11-16 Ｊｆｅスチール株式会社 鋼板の製造設備及び製造方法
JP7556027B2 (ja) * 2021-02-18 2024-09-25 Ｊｆｅスチール株式会社 鋼板の形状予測方法、形状制御方法、製造方法、形状予測モデルの生成方法、及び製造設備
CN114130834B (zh) * 2021-11-30 2023-08-22 宝武集团鄂城钢铁有限公司 一种采用单机架轧机精确控制薄钢板厚度范围的生产方法

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JPH0222424A (ja) * 1988-07-08 1990-01-25 Sumitomo Metal Ind Ltd 鋼帯のロール冷却方法
JPH0763750B2 (ja) * 1988-12-28 1995-07-12 新日本製鐵株式会社 熱間圧延鋼板の冷却制御装置
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JP3978141B2 (ja) * 2003-01-16 2007-09-19 新日本製鐵株式会社 厚鋼板の冷却方法及び冷却装置
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JP5626275B2 (ja) * 2011-07-27 2014-11-19 新日鐵住金株式会社 熱延鋼板の冷却方法

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KR102303872B1 (ko) 2021-09-17
JP2018144050A (ja) 2018-09-20
EP3560616A1 (de) 2019-10-30
JP6720894B2 (ja) 2020-07-08
KR20190112085A (ko) 2019-10-02
EP3560616A4 (de) 2020-01-15
WO2018159749A1 (ja) 2018-09-07
CN110366456B (zh) 2021-08-31
CN110366456A (zh) 2019-10-22

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