WO2011001935A1 - 熱延鋼板の冷却装置、冷却方法、製造装置、及び、製造方法 - Google Patents

熱延鋼板の冷却装置、冷却方法、製造装置、及び、製造方法 Download PDF

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Publication number
WO2011001935A1
WO2011001935A1 PCT/JP2010/060971 JP2010060971W WO2011001935A1 WO 2011001935 A1 WO2011001935 A1 WO 2011001935A1 JP 2010060971 W JP2010060971 W JP 2010060971W WO 2011001935 A1 WO2011001935 A1 WO 2011001935A1
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Prior art keywords
steel plate
steel sheet
cooling
hot
final stand
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PCT/JP2010/060971
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English (en)
French (fr)
Japanese (ja)
Inventor
学 江藤
洋一 原口
Original Assignee
住友金属工業株式会社
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Application filed by 住友金属工業株式会社 filed Critical 住友金属工業株式会社
Priority to CN201080023527.6A priority Critical patent/CN102448632B/zh
Priority to KR1020117027955A priority patent/KR101362566B1/ko
Priority to JP2011520910A priority patent/JP5673530B2/ja
Publication of WO2011001935A1 publication Critical patent/WO2011001935A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—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

Definitions

  • the present invention relates to a cooling apparatus, a cooling method, a manufacturing apparatus, and a manufacturing method for a hot-rolled steel sheet.
  • the present invention particularly relates to a hot-rolled steel sheet cooling apparatus, a cooling method and a manufacturing apparatus that are suitably used when manufacturing hot-rolled steel sheets having ultrafine crystal grains, and manufacture of hot-rolled steel sheets having ultrafine crystal grains. Regarding the method.
  • Steel materials used for automobiles, structural materials, etc. are required to have excellent mechanical properties such as strength, workability, and toughness. It is effective to reduce the size. Therefore, many manufacturing methods for obtaining a hot rolled steel sheet having fine crystal grains have been sought. Further, if the crystal grains are refined, it is possible to produce a high-strength hot-rolled steel sheet having excellent mechanical properties even if the addition amount of the alloy element is reduced.
  • high-pressure rolling is performed to refine austenite grains and accumulate rolling strain in the grains, after cooling (or after transformation) And the like, and the like.
  • it is effective to cool the steel sheet to a predetermined temperature or lower (for example, 720 ° C. or lower) in a short time after rolling.
  • a predetermined temperature or lower for example, 720 ° C. or lower
  • it is effective to install a cooling device that can cool faster than before, followed by hot finish rolling, and rapidly cool the rolled steel sheet. It is.
  • Patent Document 1 discloses a method for producing a hot-rolled steel sheet by multi-pass hot rolling a steel sheet or slab made of carbon steel or low alloy steel containing C: 0.01 to 0.3% by mass.
  • a method for producing an ultrafine-grained hot-rolled steel sheet is disclosed, wherein the final rolling pass is terminated at a temperature of 3 or more points of Ar and then cooled to 720 ° C. or less within 0.4 seconds.
  • a final stand, a first cooling device, a second cooling device, and a winding device in a hot rolling finish rolling mill row are sequentially arranged in the steel plate conveyance direction
  • the first cooling device has a strip or oval shape on the surface to be cooled of the steel plate.
  • a nozzle that should form a jet collision area and a dam roll that dams cooling water sprayed from the nozzle, and a pool of cooling water is formed in the area between the roll of the final stand and the dam roll.
  • Patent Document 3 discloses a cooling facility for supplying cooling water to the upper surface of a steel sheet while passing the steel sheet at a position close to the entry-side and / or exit-side rolling mill of a rolling mill that hot-rolls the steel sheet.
  • the cooling equipment is arranged so that the cooling water after supplying the steel sheet with a header having a nozzle that injects bar-shaped cooling water toward the rolling mill side at a depression angle of 30 ° to 60 ° with respect to the upper surface of the steel plate
  • a hot-rolling equipment for a steel sheet is disclosed, which is provided at a position where it can be dammed by a work roll.
  • Patent Document 1 According to the technique disclosed in Patent Document 1, a steel plate having a temperature of Ar 3 or higher is cooled to 720 ° C. within 0.4 seconds after the end of the final rolling pass. It is considered that a hot-rolled steel sheet having crystal grains having an average grain diameter of 2 ⁇ m or less (the same applies hereinafter) can be produced. However, Patent Document 1 does not disclose a detailed configuration of a cooling device that can cool a steel plate to 720 ° C. within 0.4 seconds from the end of the final rolling pass.
  • the rapid cooling required when producing a hot-rolled steel sheet having ultrafine crystal grains has a cooling rate of at least 400 ° C./s or more as shown in Patent Document 1, for example. Is required to be rapidly cooled by nucleate boiling cooling.
  • the collision pressure of the cooling water that collides with the steel sheet surface is reduced to the extent that nucleate boiling cooling is possible.
  • the present invention can manufacture a hot-rolled steel sheet having ultrafine crystal grains and increase the use efficiency of cooling water, a hot-rolled steel sheet cooling device, a hot-rolled steel sheet cooling method, and a hot-rolled steel sheet It is an object to provide a manufacturing apparatus and a method for manufacturing a hot-rolled steel sheet.
  • the inventors of the present invention conducted research on the production of hot-rolled steel sheets having ultrafine crystal grains (hereinafter sometimes referred to as “ultrafine grain steel”), and obtained the following knowledge.
  • (1) As shown in FIG. 11, after rolling in a temperature range of 3 or more points of Ar, when cooling to 720 ° C. is completed within 0.2 seconds, the crystal grains can be further refined Become.
  • the reduction point in the final stand of the hot finish rolling mill (the bottom dead center of the work roll contacting the upper surface of the steel sheet to be rolled and the top dead center of the work roll contacting the lower surface of the steel sheet to be rolled)
  • the end of the final stand housing post (hereinafter referred to as “in-stand area”) in the steel plate conveyance direction L1, and rapid cooling in the in-stand area.
  • the length in the steel plate conveyance direction of the section in which the steel sheet can be conveyed is L2
  • the cooling rate in the section is Z1
  • the length in the steel plate conveyance direction in the section where rapid cooling is difficult in the stand internal region is L3
  • the cooling speed in the section is Z2.
  • the cooling rate represented by ⁇ L2 ⁇ Z1 + L3 ⁇ Z2 ⁇ / L1 is the average cooling rate.
  • the time required for lowering the temperature of the steel plate by 100 ° C. is 0.167 seconds. Therefore, in order to finish the cooling within 0.2 seconds, it is necessary to start the cooling within 0.033 seconds after rolling. For example, when the steel plate is moved at a speed of 10 m / s, the moving distance in 0.033 seconds is 0.33 m.
  • the rapid cooling after rolling starts within a position corresponding to the radius of the work roll of the final stand in the hot rolling mill row, and at least in the final stand in the hot rolling mill row is quenched almost continuously.
  • the distance that the steel plate moves in 0.2 seconds is 2 m.
  • the distance from the reduction point in the final stand of a general hot finish rolling mill to the housing post exit side of the final stand is also about 2 m. Therefore, the required rapid cooling must be done almost in the final stand.
  • a rapid cooling possible range a region obtained by excluding a portion where it is difficult to perform rapid cooling from the region from the reduction point to the stand exit side.
  • the required cooling rate in the region from the final stand reduction point to the housing post exit side of the final stand must be secured.
  • the distance from the reduction point to the housing post exit side is 1.8 m
  • the work roll radius is 0.35 m
  • the point on the most upstream side of the portion where the injected cooling water directly collides with the steel plate (hereinafter, “The “cooling start point” was 0.15 m from the reduction point
  • the plate speed was 10 m / s
  • the plate thickness of the steel plate was 3 mm.
  • the cooling water supply pressure was 1.5 MPa at the cooling header. Only the conditions under which the crystal grain size target of 2 ⁇ m or less was achieved are extracted and the results are shown in Table 1.
  • region 1 the subscript indicating a region within the work roll radius equivalent position (hereinafter sometimes referred to as “region 1”) is “1”, and the region up to the housing post exit side (hereinafter referred to as “region 1”).
  • region 2 the region up to the housing post exit side
  • the subscript indicating “2” may be referred to as “region 2”.
  • the cooling speeds in the respective regions are V1 and V2
  • the collision pressure of the cooling water on the steel plate is P1 and P2
  • the flow rate of the cooling water Densities are W1 and W2.
  • total cooling area the subscript indicating the area from the cooling start point (0.15 m) to the housing post exit side (1.8 m) (hereinafter sometimes referred to as “total cooling area”) is “m”,
  • total cooling area the subscript indicating the area from the cooling start point (0.15 m) to the housing post exit side (1.8 m) (hereinafter sometimes referred to as “total cooling area”) is “m”.
  • the cooling area is also constant, so the flow density W is also an indicator of the amount of cooling water to be used, and the required energy of the pump that supplies the cooling water is compared. It becomes an index to
  • the average cooling rate Vm in the entire cooling region is expressed as Test No. Test No. 1 in which V1 was made larger than V2 while being kept near 615 ° C./s, the same as in FIG. 2 and No. 3 increased the effect of crystal grain refinement. A ferrite grain size finer than 1 was obtained.
  • Test No. 3 for test no. 4 and test no. 5 when V2 was lowered while keeping V1 constant at 1600 ° C./s, the effect of refining the crystal grains was somewhat reduced, but the average cooling rate was 404 ° C./s. It was found that the target particle size of 2 ⁇ m or less can still be obtained even under the condition of 5. Test No.
  • test no. 4 and test no. 5 is almost the same as the grain refinement effect, while the test no. 4 and test no. Wm of 5 is the test No. It was smaller than 1 Wm, and as a whole, fine granulation could be achieved efficiently with a small amount of cooling water (the use efficiency of cooling water could be increased). It is possible to further increase V1 to increase the effect of refining crystal grains and increase the efficiency of use of cooling water. However, if the local flow density in region 1 is excessively increased, the cooling water in the rolling mill is increased. There is a possibility that the impinging force on the steel plate of the cooling water jet is scraped off by the staying water, and consequently V1 cannot be increased.
  • the upper limit value of the flow density W1 is preferably about 20 m 3 / m 2 ⁇ min, and the upper limit of the cooling rate V1 corresponding to the plate thickness of 3 mm is 1600 ° C. / S.
  • the present invention has been completed based on the above findings, and the gist thereof is as follows.
  • a hot-rolled steel sheet cooling device (20) comprising a header (21, 22) having a plurality of nozzles (21a, 21a, ..., 22a, 22a, ...) provided so as to be capable of spraying,
  • V1 the work roll radius equivalent position of the final stand and the housing post exit side of the final stand V1 ⁇ V2 when the average cooling rate of the steel sheet surface cooled by the high-pressure jet water colliding with the steel sheet surface existing between
  • downstream side refers to the downstream side in the conveying direction of the steel plate (1).
  • high pressure jet water refers to jet water having a pressure capable of nucleate boiling cooling the steel plate (1).
  • the position corresponding to the radius of the work roll of the final stand means, as shown in FIG. 4, a portion where the rolled steel plate (1) and the work rolls of the final stand (11 gw, 11 gw) are in contact (more specifically) Are the bottom dead center of the work roll (11 gwu) in contact with the upper surface of the steel plate (1) and the top dead center of the work roll (11 gwd) in contact with the lower surface of the steel plate (1).
  • the surface of the steel sheet existing within the position corresponding to the radius of the work roll of the final stand means between the position corresponding to the radius of the work roll of the final stand and the reduction point (more than the position corresponding to the radius of the work roll of the final stand. It refers to the surface (upper surface and lower surface) of the steel plate (1) existing on the reduction point side.
  • the “average cooling rate of the steel sheet surface” refers to, for example, each of the plurality of parallelogram regions considered when calculating the vertical component of the steel sheet conveyance direction average value of the steel plate surface collision pressure of high-pressure jet water described later.
  • “V1” is a cooling rate calculated for each parallelogram region by dividing the upper surface (or the lower surface) of the steel sheet existing within the position corresponding to the radius of the work roll of the final stand into a plurality of parallelogram regions. The average value of At that time, the boundary on the upstream side of the region closest to the work roll is the most upstream side of the portion where the high-pressure jet water directly collides with the steel plate, that is, the point close to the reduction point (cooling start point).
  • the “housing post exit side of the final stand” refers to the outer surface of the housing post (11gh) of the final stand (the outer surface on the downstream side in the steel plate conveyance direction).
  • V2 divides the upper surface (or the lower surface) of the steel plate existing between the position corresponding to the radius of the work roll of the final stand and the housing post exit side of the final stand into a plurality of parallelogram regions, The average value of the cooling rate calculated about each parallelogram area
  • Vm is defined by dividing the upper surface (or the lower surface) of the steel plate existing between the cooling start point in the final stand and the housing post exit side of the final stand into a plurality of parallel quadrangular regions. It means the average value of the cooling rates calculated for the quadrilateral region.
  • the vertical component of the average value in the steel plate conveyance direction of the steel plate surface collision pressure of the high-pressure jet water colliding with the surface of the steel plate existing within the position corresponding to the radius of the work roll of the final stand is P1
  • the vertical component of the average value in the steel plate conveyance direction of the steel plate surface collision pressure of the high-pressure jet water colliding with the surface of the steel plate existing between the position corresponding to the radius of the work roll of the final stand and the housing post exit side of the final stand is P2.
  • the vertical component Pm of the average value in the steel sheet conveyance direction is 2.7 kPa or more.
  • the vertical component of the average value of the steel plate surface collision pressure of the high-pressure jet water in the steel plate conveyance direction is an arbitrary position in the steel plate width direction, for example, at the center in the width direction, along the line segment in the steel plate conveyance direction.
  • a collision component of high-pressure jet water received on the surface of the steel sheet is measured or calculated, and averaged over a predetermined region, which means a vertical component (hereinafter sometimes referred to as “average collision pressure” or “average collision pressure”). ).
  • average collision pressure or average collision pressure
  • the average collision pressure on the steel plate surface that one nozzle takes is: It can be calculated by dividing the force (collision force) of the high-pressure jet water colliding with the parallelogram area whose area is represented by A ⁇ B by the area A ⁇ B of the parallelogram area.
  • “Pm” is defined by dividing the upper surface (or lower surface) of the steel plate existing between the cooling start point in the final stand and the housing post exit side of the final stand into a plurality of parallel quadrilateral regions. The average value of the average collision pressure calculated for the quadrilateral region.
  • per unit area of the high-pressure jet water sprayed onto the surface of the steel plate existing within the position corresponding to the radius of the work roll of the final stand is W1
  • W1 the amount of water per unit area of high-pressure jet water sprayed onto the surface of the steel plate existing between the position of the work roll radius of the final stand and the housing post exit side of the final stand
  • the “unit area” is not particularly limited as long as the area when the water amount W1 is derived and the area when the water amount W2 is derived are the same.
  • the “unit area” for example, an area of a parallelogram used for deriving a vertical component of an average value in the steel plate conveyance direction of the steel plate surface collision pressure of high-pressure jet water can be used.
  • the distance between the high pressure jet water injection port of the nozzle disposed at the position closest to the work roll of the final stand and the steel plate is D1, and is closest to the housing post exit side of the final stand.
  • D1 the distance between the high-pressure jet water injection port of the nozzle disposed at the position and the steel plate.
  • high-pressure jet water is supplied from the nozzle toward the upper surface and the lower surface of the steel plate. It is preferable to be configured so that it can be continuously ejected in the conveying direction of the steel sheet.
  • “From within the position corresponding to the radius of the work roll of the final stand” means between the position corresponding to the radius of the work roll of the final stand and the reduction point (from the position corresponding to the radius of the work roll of the final stand).
  • the high pressure jet water sprayed from the nozzles (21a, 21a,..., 22a, 22a,...) Is supplied to the upper surface and the lower surface of the steel plate (1) present in FIG.
  • the strict start point of the section in which the high-pressure jet water is continuously injected is the most upstream side of the portion where the high-pressure jet water directly collides with the steel plate within the position corresponding to the radius of the work roll, that is, the point close to the reduction point.
  • the “housing post exit side of the final stand” refers to the outer surface of the housing post (11gh) of the final stand (the outer surface on the downstream side in the steel plate conveyance direction).
  • nozzle means a plurality of nozzles (21a, 21a arranged at predetermined intervals in the conveyance direction of a steel plate (1). , ..., 22a, 22a, ...) means that the high-pressure jet water can be continuously jetted from the upper surface and the lower surface of the steel plate (1).
  • the vertical component of the average value in the steel plate conveyance direction of the steel plate surface collision pressure of the high-pressure jet water in the section is 3.5 kPa or more on the upper surface and the lower surface.
  • the nozzles are preferably flat spray nozzles.
  • a space capable of discharging cooling water is secured between both end faces in the steel plate width direction of the cooling device (20) and both end faces in the steel plate width direction of the final stand (11g). It is preferable.
  • the steel plate width direction both end surfaces of the cooling device (20) refers to the outer surfaces of the cooling device (20) at the width direction both ends of the steel plate (1).
  • the “steel plate width direction both end surfaces of the final stand (11g)” refers to the inner surfaces of the housing posts (11gh) of the final stand on both ends in the width direction of the steel plate (1).
  • the “upper surface guide (23)” means that the steel plate (1) rolled in the final stand (11g) is the work roll (11gwu) of the final stand or the nozzles (21a, 21a,...) Of the cooling device (20). ) Refers to a member of the cooling device (20) installed on the upper surface side of the steel plate (1) for the purpose of preventing collision with the steel plate.
  • the “lower surface guide (24)” means that the steel plate (1) rolled by the final stand (11g) is the work roll (11gwd) of the final stand or the nozzles (22a, 22a,...) Of the cooling device (20). ) Refers to a member of the cooling device (20) installed on the lower surface side of the steel plate (1) for the purpose of preventing collision with the steel plate.
  • a plurality of headers (21, 31, 22, 32) are provided, and at least a part of the headers are in the conveying direction of the steel plate (1) and the width direction of the steel plate (1). It is preferable that the cooling water can be collectively supplied to the nozzles (31a, 31a, ..., 32a, 32a, ...) arranged in a plurality of rows.
  • At least a part of the header is configured to be able to collectively supply cooling water to nozzles arranged in a plurality of rows in each of the conveying direction of the steel sheet and the width direction of the steel sheet.
  • a plurality of headers (21, 31) are arranged on the upper surface side of the steel plate, and among the headers provided on the upper surface side of the steel plate, at least the header (31) arranged on the most upstream side in the conveying direction of the steel plate is It is preferable that the header is configured so that the cooling water can be collectively supplied to the nozzles (31a, 31a,...) Arranged in a plurality of rows in each of the conveying direction and the width direction of the steel plate.
  • At least a part of the header is configured to be able to collectively supply cooling water to nozzles arranged in a plurality of rows in each of the conveying direction of the steel sheet and the width direction of the steel sheet.
  • a plurality of headers (22, 32) are disposed on the lower surface side of the steel sheet, and among the headers provided on the lower surface side of the steel sheet, at least the header (32) disposed on the most upstream side in the conveying direction of the steel sheet is It is preferable that the header is configured so that the cooling water can be collectively supplied to the nozzles (32a, 32a,...) Arranged in a plurality of rows in each of the conveying direction and the width direction of the steel plate.
  • a third aspect of the present invention is a hot-rolled steel sheet, wherein the steel sheet is cooled using the hot-rolled steel sheet cooling device according to the first aspect of the present invention or the second aspect of the present invention. This is a cooling method.
  • the fourth aspect of the present invention is the final stand (11g) in the hot finish rolling mill row (11), and cooling of the hot rolled steel sheet according to the first aspect of the present invention or the second aspect of the present invention. It is a manufacturing apparatus (10) of a hot-rolled steel sheet characterized by comprising an apparatus (20, 20 ') in order in the conveying direction of the steel sheet (1).
  • the fifth aspect of the present invention is rolled at the final stand (11g) in the hot finish rolling mill (11) using the hot-rolled steel sheet manufacturing apparatus (10) according to the fourth aspect of the present invention. It is a manufacturing method of a hot-rolled steel plate characterized by including the process of processing the obtained steel plate (1).
  • the average cooling rate V1 cooled by the high-pressure jet water sprayed onto the surface of the steel sheet existing on the side of the reduction point from the position corresponding to the work roll radius of the final stand is the position corresponding to the work roll radius corresponding to the final stand.
  • the average cooling rate is V2 or higher, which is cooled by the high-pressure jet water sprayed onto the surface of the steel plate existing between the housing post exit side of the final stand, and Vm ⁇ 400 ° C./s.
  • the vertical component P1 of the average value in the steel plate conveyance direction of the steel plate surface collision pressure of the high-pressure jet water that has collided with the surface of the steel plate existing on the side of the reduction point from the position corresponding to the radius of the work roll of the final stand is
  • the steel sheet can be rapidly cooled immediately after the rolling of the final stand is finished, and the use efficiency of the cooling water used when manufacturing the ultrafine grain steel can be enhanced.
  • a hot-rolled steel sheet cooling device, a hot-rolled steel sheet cooling method, a hot-rolled steel sheet which can produce a hot-rolled steel sheet having ultrafine crystal grains and can improve the use efficiency of cooling water. It becomes possible to provide the manufacturing apparatus of a steel plate, and the manufacturing method of a hot-rolled steel plate.
  • FIG. 1 It is a figure which shows typically a part of manufacturing apparatus of the hot-rolled steel plate concerning this invention. It is a figure which expands and shows the part by which the cooling device of the hot-rolled steel plate of this invention is arrange
  • FIG. 8A shows a case where the nozzle is a flat spray nozzle
  • FIG. 8B shows a case where the nozzle is a columnar nozzle.
  • the position corresponding to the radius of the work roll of the final stand, the housing post exit side of the final stand, and the perpendicular value of the average value in the steel sheet conveying direction of the steel plate surface collision pressure of high-pressure jet water It is a figure explaining the concept of a component. It is a figure which extracts and expands and shows the part by which the cooling device of the hot-rolled steel plate of this invention concerning another form is arrange
  • FIG. 1 is a diagram schematically showing a part of a hot-rolled steel sheet cooling device 20 of the present invention and a hot-rolled steel sheet manufacturing apparatus 10 of the present invention equipped with the cooling device 20.
  • the steel sheet 1 is conveyed from the left (upstream side) to the right (downstream side) of the drawing, and the vertical direction of the drawing is the vertical direction.
  • the upstream side / downstream side direction may be described as the conveying direction
  • the direction of the plate width of the steel plate to be passed through may be described as the steel plate width direction.
  • repeated reference numerals may be omitted in the drawings.
  • a hot-rolled steel sheet manufacturing apparatus 10 of the present invention includes a hot finish rolling mill row 11 and a hot-rolled steel sheet of the present invention.
  • a cooling device 20 (hereinafter, simply referred to as “cooling device 20”), a transport roll 12 and a pinch roll 13 are provided.
  • cooling device 20 a heating furnace, a rough rolling mill row, and the like are arranged on the upstream side of the hot finish rolling mill row 11, and the conditions of the steel sheet rolled by the hot finish rolling mill row 11 are adjusted.
  • cooling device 20 hereinafter, simply referred to as “cooling device 20”
  • a transport roll 12 and a pinch roll 13 are provided.
  • a heating furnace, a rough rolling mill row, and the like are arranged on the upstream side of the hot finish rolling mill row 11, and the conditions of the steel sheet rolled by the hot finish rolling mill row 11 are adjusted.
  • other cooling devices, winders and the like are arranged, and various facilities for shipping the steel plate as a coil are arranged.
  • Hot-rolled steel sheets are generally manufactured as follows. That is, the rough bar extracted from the heating furnace and rolled to a predetermined thickness by a roughing mill is continuously rolled to a predetermined thickness by the hot finish rolling mill row 11 while the temperature is controlled. Thereafter, it is rapidly cooled by the cooling device 20.
  • the cooling device 20 applies the work rolls 11gw and 11gw of the final stand from the inside of the housing post 11gh of the final stand of the hot finish rolling mill row 11 (hereinafter referred to as the work roll 11gw in contact with the upper surface of the steel plate 1)
  • the roll 11gwu ”and the work roll 11gw in contact with the lower surface of the steel plate 1 may be referred to as“ work roll 11gwd ”) as close as possible.
  • the steel plate which passed the pinch roll 13 is cooled to predetermined winding temperature by another cooling device after that, and is wound up in a coil form with the winder.
  • the manufacturing apparatus 10 includes the hot finish rolling mill row 11.
  • seven rolling mills (11a, 11b, 11c,..., 11g) are arranged in parallel along the transport direction.
  • Each of the rolling mills 11a, 11b,..., 11g is a rolling mill that constitutes a so-called stand, and can satisfy conditions such as thickness, mechanical properties, and surface quality required for the final product. Thus, the rolling reduction is set.
  • FIG. 2 and 3 are enlarged views showing a portion where the cooling device 20 is arranged.
  • FIG. 2 shows a state of the cooling device 20 that rapidly cools the upper surface and the lower surface of the steel plate immediately after passing through the reduction point of the final stand 11g, and the dotted line in FIG. 2 represents high-pressure jet water.
  • FIG. 3 shows a state of the cooling device 20 when the work rolls 11gw and 11gw of the final stand 11g are exchanged.
  • FIG. 4 shows the vertical component of the average value in the steel plate conveying direction of the position of the work roll of the final stand, the exit side of the housing post 11gh of the final stand, and the steel plate surface collision pressure of the high pressure jet water.
  • FIG. 5 is a conceptual diagram showing the pressure distribution of the high-pressure jet water jetted onto the upper surface of the steel plate 1.
  • the vertical axis in FIG. 5 is a vertical component [kPa] of the average value in the steel plate conveyance direction of the steel plate surface collision pressure of the high-pressure jet water jetted onto the upper surface of the steel plate 1, and the horizontal axis in FIG. Is the distance.
  • X1 is the position corresponding to the radius of the work roll of the final stand
  • X2 is the position of the final stand on the housing post exit side.
  • the cooling device 20 will be described in detail with reference to FIGS.
  • the cooling device 20 is disposed on the downstream side of the final stand 11 g in the hot finish rolling mill row 11.
  • the cooling device 20 includes a header 21 to which a plurality of flat spray nozzles 21a, 21a,... (Hereinafter, simply referred to as “nozzle 21a” or the like) that inject high-pressure jet water toward the upper surface of the steel plate 1 are connected.
  • 21 and headers 22, 22 to which a plurality of flat spray nozzles 22 a, 22 a, (hereinafter simply referred to as “nozzle 22 a”) for injecting high-pressure jet water toward the lower surface of the steel plate 1 are connected. It is equipped with.
  • a predetermined pitch in the steel plate width direction Arranged at a predetermined pitch in the steel plate width direction are connected to the header 21, and the plurality of headers 21, 21,. ing.
  • a plurality of nozzles 22a, 22a,... Arranged at a predetermined pitch in the steel plate width direction are connected to the header 22, and the plurality of headers 22, 22,. Is arranged in.
  • the headers 21, 21,... Are configured to be able to supply cooling water to a plurality of nozzles 21 a, 21 a,... Arranged at a predetermined pitch in the width direction of the steel plate 1, and the headers 22, 22,.
  • the cooling water can be collectively supplied to a plurality of nozzles 22a, 22a,... Arranged at a predetermined pitch in the width direction.
  • the two rows of nozzles 21a and 21a on the upper surface side of the steel plate 1 and the two rows of nozzles 22a and 22a on the lower surface side of the steel plate 1 are arranged on the most upstream side in the conveyance direction of the steel plate 1.
  • the respective axial directions are arranged so as to intersect the vertical plane.
  • an angle formed by the axial direction of the nozzles 21 a and 22 a arranged on the most upstream side in the conveying direction of the steel sheet 1 with respect to the vertical plane (hereinafter referred to as “vertical in-plane inclination angle”) is the nozzle.
  • the nozzles 21a, 21a,... In the vicinity of the work roll 11gwu are arranged so that the angle (injection angle) with respect to the upper surface of the steel plate 1 of the injected high-pressure jet water becomes smaller as the work roll 11gwu is approached.
  • the nozzles 22a, 22a,... In the vicinity of the work roll 11gwd are arranged such that the angle (injection angle) with respect to the lower surface of the steel plate 1 of the injected high-pressure jet water becomes smaller as the work roll 11gwd gets closer. .
  • the cooling device 20 includes a header 21 and an upper surface guide 23 that are provided in proximity to the work roll 11gwu of the final stand 11g, and a header 22 and a lower surface that are provided in proximity to the work roll 11gwd of the final stand 11g.
  • the guide 24 is integrally formed. Therefore, for example, when replacing the work rolls 11gw and 11gw of the final stand, as shown in FIG.
  • the header 21 is moved together with the upper surface guide 23 provided close to the work roll 11gwu of the final stand, and The header 22 can be moved together with the lower surface guide 24 provided in the vicinity of the work roll 11gwd of the final stand, so that the chock (not shown) on the driving side (the back side in FIG. 3) comes out to the operation side. Space is available and roll replacement work is possible.
  • the cooling device 20 includes headers 21, 21,..., And a steel plate to which a plurality of nozzles 21a, 21a,. .., To which a plurality of nozzles 22a, 22a,...
  • a steel plate that is equal to the average cooling rate V2a of the upper surface of the steel plate 1 located between the position and the exit side of the housing post 11gh of the final stand 11g, and that is located closer to the reduction point than the work roll radius equivalent position of the final stand 11g.
  • the average cooling rate V1b of the lower surface of 1 is equal to the average cooling rate V2b of the lower surface of the steel plate 1 located between the position corresponding to the work roll radius of the final stand 11g and the exit side of the housing post 11gh of the final stand 11g.
  • the high-pressure jet water is sprayed toward the steel plate 1.
  • the collision pressure average value P1 of the cooling water sprayed from the nozzle 21a to the region closer to the reduction point than the work roll radius equivalent position X1 of the final stand 11g is from the nozzle 21a to the final stand 11g.
  • This is equal to the collision pressure average value P2 of the cooling water injected between the work roll radius equivalent position X1 and the housing post exit side X2 of the final stand 11g.
  • the cooling device 20 not only the upper and lower surfaces of the steel plate existing between the position corresponding to the work roll radius of the final stand 11g and the outer surface of the housing post 11gh of the final stand 11g, but also the work roll of the final stand 11g.
  • the upper surface and the lower surface of the steel plate 1 existing within the position corresponding to the radius can also be rapidly cooled using high-pressure jet water.
  • the nozzles 21a, 21a,... In the vicinity of the work roll 11gwu have an angle (injection angle) with respect to the upper surface of the steel plate 1 that is injected as the nozzle 21a, 21a,.
  • a jet is generated in the vicinity of the work rolls 11gwu and 11gwd (within the position corresponding to the work roll radius of the final stand).
  • the pressure of the jet water that collides with the upper and lower surfaces of the steel plate 1 can be increased. Therefore, according to the cooling device 20, high-pressure jet water is sprayed on the upper and lower surfaces of the steel plate 1 existing within the position corresponding to the work roll radius of the final stand 11g, and the upper and lower surfaces of the steel plate 1 collide. Since the subsequent high-pressure jet water generates a jet, the steel plate 1 immediately after passing through the reduction point can be rapidly cooled.
  • P1 can also be increased by increasing the feed water pressure of the high-pressure spray that collides with the work roll radius, or by changing the nozzle type. That is, by setting the cooling device 20 in such a form, it is possible to cool the upper surface and the lower surface of the steel plate 1 that has passed the reduction point faster, stronger, and continuously. Therefore, according to the present invention, it is possible to provide a cooling device 20 capable of producing ultrafine-grained steel. In addition, even if stagnant water exists on the surface of the steel plate 1, the high pressure jet water can penetrate the boiling film on the steel plate surface. It becomes possible to boil cool (rapidly cool).
  • FIG. 6 is a diagram showing a relationship between the average value of the steel plate surface collision pressure of the high-pressure jet water and the average cooling rate of the steel plate.
  • the vertical axis in FIG. 6 is the average cooling rate [° C./s] when cooling the temperature of a steel plate having a thickness of 3 mm with no cooling water on the surface from both sides (upper surface and lower surface) from 750 ° C. to 600 ° C. Yes, the horizontal axis of FIG. 6 is the average value [kPa] in the steel plate conveyance direction of the steel plate surface collision pressure of the high-pressure jet water. As shown in FIG.
  • the average value of the high-pressure jet water collision surface pressure in the steel plate direction is A
  • the nozzle pitch in the steel plate width direction of the cooling water reaching the steel plate surface is B
  • the average collision pressure per piece is averaged in the section in the transport direction.
  • the vertical component of the steel sheet conveying direction average value of the steel sheet surface collision pressure of the high-pressure jet water sprayed from the cooling device 20 to the steel sheet 1 is 2.7 kPa or more. From the standpoint of making the steel plate 1 easy to cool while suppressing the recovery of austenite grains, etc., it is preferably 3.5 kPa or more. Moreover, in this invention, it is preferable to quench the steel plate 1 rapidly with an average cooling rate of 1000 degrees C / s or more from a viewpoint of making a crystal grain into the form which can be refined
  • the average collision pressure value of the cooling water it is more preferable to set the average collision pressure value of the cooling water to 8 kPa or more from the viewpoint of making the steel sheet 1 capable of being rapidly cooled at an average cooling rate of 1000 ° C./s or more.
  • the cooling rate varies depending on the plate thickness, and is approximately inversely proportional to the plate thickness. If the hot-rolled steel sheet cooling device of the present invention has the ability to rapidly cool a steel sheet having a thickness of 3 mm at an average cooling rate of 1000 ° C./s, an average cooling of a steel sheet having a thickness of 5 mm is 600 ° C./s. It becomes possible to rapidly cool at a speed.
  • the average collision pressure per nozzle is equal to the collision force of the high-pressure jet water ejected from the nozzle divided by the cooling area of the nozzle. Therefore, even if the collision force is measured instead of measuring the pressure, the collision pressure average value of the cooling water can be calculated, and the collision force of the high-pressure jet water can be obtained from its flow rate and flow velocity. Since the flow velocity depends on the water supply pressure to the nozzle, the average value of the steel plate surface collision pressure can be estimated from the water supply pressure to the nozzle if a predetermined pressure loss is expected. An example of a method of calculating the steel plate surface collision pressure average value is described below.
  • the pressure of the high-pressure jet water jetted from the nozzle 21a is reduced by the stagnant water, and the collision pressure of the high-pressure jet water when reaching the surface of the steel plate 1 is reduced.
  • D1 D2 can be set, and V1> V2 or P1> P2 can be set.
  • V1> V2 or P1> P2 can be set.
  • the amount of water W1 per unit area of high-pressure jet water sprayed onto the surface of the steel sheet existing within the position corresponding to the radius of the work roll of the final stand, and the position corresponding to the radius of the work roll of the final stand and the final By injecting the high-pressure jet water so that the amount of water W2 per unit area of the high-pressure jet water injected to the surface of the steel plate existing between the housing post exit side of the stand is W1 ⁇ W2, V1 ⁇ It is also possible to satisfy V2 or P1 ⁇ P2.
  • the hot-rolled steel sheet cooling device of the present invention is not limited to this form.
  • the radius of the work roll of the final stand is created by actively colliding the high pressure jet water sprayed within the position corresponding to the radius of the work roll of the final stand with the work roll to generate a jet near the reduction point. From the viewpoint of making the surface of the steel sheet existing within a corresponding position easy to cool rapidly, it is preferable to inject the high-pressure jet water so that the injection angle of the high-pressure jet water becomes smaller as it approaches the work roll.
  • the hot-rolled steel sheet cooling apparatus of the present invention is limited to this form. Instead of this, a so-called columnar nozzle may be provided.
  • cooling in a form that reduces nozzle clogging and easily increases the vertical component of the average value in the steel plate conveyance direction of the steel plate surface collision pressure of high-pressure jet water even when stagnant water is present on the surface From the viewpoint of providing an apparatus and the like, it is preferable that a flat spray nozzle is provided.
  • the flat spray nozzle can be devised in the form of arrangement so that directivity can be generated in the drainage of the cooling water present on the surface of the steel sheet, and thus the drainage can be improved.
  • FIG. 8 shows an example of the shape of a portion where the high-pressure jet water jetted from the nozzle collides with the steel plate surface, and a quadrilateral considered when deriving the vertical component of the average value of the steel plate surface collision pressure of the high-pressure jet water on the steel plate surface.
  • FIG. 8A shows a case where the nozzle is a flat spray nozzle
  • FIG. 8B shows a case where the nozzle is a columnar nozzle.
  • the back / front direction of the paper is the thickness direction of the steel sheet.
  • part colored in FIG. 8 represents the site
  • part where a high pressure jet water collides with the steel plate surface becomes elliptical shape or oval shape.
  • the area of the quadrilateral region (parallelogram region) considered when deriving the vertical component of the steel plate conveyance direction average value of the steel plate surface collision pressure of the high-pressure jet water is the nozzle pitch A in the plate width direction of the steel plate.
  • the nozzle pitch B in the conveying direction of the steel plate can be calculated.
  • FIG.8 (b) when a nozzle is a columnar nozzle, the site
  • the area of the quadrilateral region (rectangular region) considered when deriving the vertical component of the average value in the steel plate conveyance direction of the steel plate surface collision pressure of the high-pressure jet water is the nozzle pitch A and the steel plate in the plate width direction of the steel plate. It can be calculated by multiplying by the nozzle pitch B in the transport direction.
  • cooling device 20 of this invention not only the area to the housing post exit side of the last stand of a hot rolling mill row
  • the present invention is not limited to this form. However, it may be assumed that the steel sheet is required to be rapidly cooled to a temperature lower than 720 ° C. within a short time after the end of rolling.
  • the flat spray nozzle is continuously arranged in the downstream region.
  • the header 21 and the upper surface guide 23 disposed on the upper surface side of the steel plate 1 are integrally configured, and the header 22 and the lower surface disposed on the lower surface side of the steel plate 1.
  • the cooling apparatus of the hot-rolled steel plate of this invention is not limited to the said form.
  • the header and the lower surface guide disposed on the lower surface side of the steel sheet are not integrally configured, and the header and the upper surface guide disposed on the upper surface side of the steel sheet are not integrally configured. It is also possible to adopt a form.
  • the lower surface guide 24 only needs to be configured to be movable, and these can be moved using a known means such as a hydraulic cylinder.
  • the header and the upper surface guide disposed on the upper surface side of the steel plate are simultaneously retracted or returned from the viewpoint of making the form easy to improve the work efficiency of the roll exchange, and are configured integrally for that purpose. It is preferable.
  • the header disposed on the lower surface side of the steel plate and the lower surface guide are configured integrally.
  • positioned by the predetermined pitch to the width direction of the steel plate 1 was connected is the steel plate 1.
  • a plurality of headers 22, 22,... Connected to a plurality of nozzles 22 a, 22 a,... Arranged at a predetermined pitch in the conveyance direction and arranged at a predetermined pitch in the width direction of the steel plate 1 are the conveyance direction of the steel plate 1.
  • the hot-rolled steel sheet cooling device of the present invention is not limited to this form.
  • the cooling device of the present invention is a header configured to be able to collectively supply cooling water to a plurality of nozzles arranged at a predetermined pitch in the width direction of the steel plate and the conveying direction of the steel plate (hereinafter referred to as “collective header”). Can be arranged on the upper surface side and / or the lower surface side of the steel plate.
  • FIG. 9 shows an example of a form of the hot-rolled steel sheet cooling device of the present invention provided with a collective header.
  • FIG. 9 is a diagram for explaining an example of a cooling apparatus for hot-rolled steel sheets provided with a collective header.
  • FIG. 9 shows the position corresponding to the radius of the work roll of the final stand and the housing post exit side of the final stand.
  • the hot-rolled steel sheet cooling device 30 of the present invention (hereinafter, sometimes simply referred to as “cooling device 30”) is provided on the upper surface side of the steel plate 1 on the most upstream side of the steel plate conveying direction.
  • a collective header 31 configured to be able to supply cooling water to the flat spray nozzles 31a, 31a,... (Hereinafter, simply referred to as “nozzle 31a”, etc.) constituting the flat spray nozzle row of the row.
  • the flat spray nozzles 32a, 32a,... (Hereinafter, simply referred to as “nozzle 32a” or the like constituting the three flat spray nozzle rows on the uppermost stream side in the steel plate conveyance direction are also provided on the lower surface side of the steel plate 1.
  • a collective header 32 configured to be able to collectively supply cooling water.
  • Two rows of nozzles 31a, 31a connected to the collective header 31 from the most upstream side in the conveying direction of the steel plate 1 are connected to be able to inject high-pressure jet water obliquely toward the upstream side in the conveying direction of the steel plate 1.
  • the two rows of nozzles 32a, 32a connected to the collective header 32 from the most upstream side in the conveying direction of the steel plate 1 are connected so that high-pressure jet water can be injected obliquely toward the upstream side in the conveying direction of the steel plate 1.
  • the vertical in-plane inclination angles of the nozzles 31 a and 32 a arranged on the most upstream side in the conveyance direction of the steel plate 1 are the same as the nozzles 31 a and 32 a adjacent to the nozzles 31 a and 32 a and the downstream side in the conveyance direction of the steel plate 1. It is set to be equal to or greater than the given vertical in-plane tilt angle. Moreover, the high-pressure jet water sprayed from the nozzles 31a and 32a arranged on the most upstream side in the transport direction of the steel plate 1 reaches a region closer to the reduction point than the position corresponding to the radius of the work roll of the final stand. Therefore, even with such a cooling device 30, it is possible to produce ultrafine-grained steel as with the cooling device 20.
  • the cooling devices 20 and 30 of the present invention it becomes possible to manufacture ultrafine-grained steel. Therefore, it becomes possible to manufacture ultrafine-grained steel by using a manufacturing apparatus 10 including the cooling device 20 and a manufacturing apparatus for hot-rolled steel sheets including the cooling device 30. Furthermore, by setting it as the form which has the process of processing the steel plate rolled by the last stand in a hot finishing rolling mill row
  • the distance between the nozzle disposed on the upper surface side of the steel plate and the upper surface of the steel plate is not particularly limited, but the collision pressure average value of the cooling water is increased by bringing the nozzle closer to the steel plate surface. This makes it easy to cool the steel sheet. Therefore, in the present invention, it is preferable that the distance between the nozzle surface (jetting surface of high-pressure jet water) facing the steel plate and the steel plate surface is less than 500 mm from the viewpoint of making the steel plate easily cooled. More preferably, it is 350 mm or less.
  • a mode in which a vertical in-plane inclination angle is given to the nozzle disposed on the upstream side in the steel plate conveyance direction is illustrated, but the present invention is not limited to this mode.
  • a vertical in-plane inclination angle to one or two or more nozzle rows including the nozzle row arranged at the position closest to the work roll of the final stand, in particular in the steel sheet conveying direction, Within the position corresponding to the radius of the work roll of the stand, it becomes easy to make the high-pressure jet water collide with the upper surface and the lower surface of the steel plate positioned closer to the roll bite, and it becomes easy to rapidly cool the steel plate after rolling.
  • one or more rows including nozzle rows arranged at the position closest to the work roll of the final stand (the uppermost stream side in the steel plate conveyance direction) It is preferable to give a vertical in-plane inclination angle to the nozzle rows (nozzle rows arranged on the upper surface side and the lower surface side of the steel plate), and the more the nozzle arranged on the upstream side in the steel plate conveyance direction, the more the vertical in-plane inclination angle. Is preferably increased.
  • a vertical in-plane inclination angle is given to the nozzle row arranged on the most upstream side in the steel plate conveyance direction, and the steel plate is arranged on the most upstream side in the steel plate conveyance direction. More preferably, the distance between the surface of the nozzle row (jetting surface of high-pressure jet water) and the surface of the steel sheet is minimized.
  • the high-pressure jet water is continuously collided with the steel plate at least in the region from the position corresponding to the radius of the work roll of the final stand in the hot finish rolling mill row to the housing post exit side of the final stand.
  • the present invention in a form in which the steel sheet is rapidly cooled immediately after passing through the reduction point is mentioned, but the present invention is not limited to this form.
  • the present invention if it is possible to cool the steel sheet to 720 ° C. or less within 0.2 seconds after passing through the reduction point, there is a section in the stand area where the high-pressure jet water does not continuously collide with the steel sheet. May be.
  • the steel sheet may be cooled to 720 ° C. or less within 0.2 seconds after passing the reduction point.
  • the portion in the stand region where it is difficult to perform rapid cooling can include a section between the roll bite position shown in FIG. 4 and the upstream end of the continuous cooling range in the steel sheet conveyance direction. .
  • the transport roll 12 is also disposed on the steel sheet lower surface side between the reduction point and the housing post exit side of the final stand.
  • the portion on the lower surface side of the steel plate where the high pressure jet water is prevented from colliding by the transport roll 12 is also a portion where it is difficult to perform rapid cooling.
  • the cooling device 20 ′ it is possible to form ultrafine grains by cooling the steel sheet to 720 ° C. or less within 0.2 seconds after passing through the reduction point. Therefore, it becomes possible to manufacture ultrafine-grained steel by using a hot-rolled steel sheet manufacturing apparatus provided with a cooling device 20 'and through a cooling process by the cooling device 20'.
  • an ultra fine grain steel is manufactured by having the process which has the process of processing the steel plate rolled by the last stand in a hot finishing rolling mill row
  • a steel plate containing 0.1 mass% C and 1 mass% Mn was A test was conducted in which the sheet was rolled at a delivery speed of 600 mpm so that the thickness was 3 mm, and then rapidly cooled.
  • the rolling end temperature was 820 ° C.
  • the rapid cooling start position was 100 mm downstream from the reduction point.
  • the average collision pressure P1 of the cooling spray from the rapid cooling start position to the roll radius equivalent position 350 mm and the average collision pressure P2 from the cooling post to the side of the housing post 1800 mm are changed, and the finally obtained ferrite particle diameter is compared and investigated. did.
  • “height D1” is the distance between the high-pressure jet water injection port of the nozzle disposed at the position closest to the roll bite position and the steel plate
  • “height D2” is the housing post exit side This is the distance between the high-pressure jet water injection port of the nozzle arranged at the position closest to and the steel plate.
  • “X to Ymm section” refers to a section whose distance from the reduction point is Xmm to Ymm.
  • condition no. In 1 to 6 the cooling rate was 400 ° C./s or more as an average value in the entire cooling region where V1 ⁇ V2 and the distance from the reduction point was 100 mm to 1800 mm. Therefore, Condition No. In 1 to 6, an ultrafine grain structure having a ferrite grain size of 2 ⁇ m or less was obtained.
  • Condition No. Nos. 1 to 6 were P1 ⁇ P2, and the collision pressure (average collision pressure) was 2.7 kPa or more as an average value in the entire cooling region where the distance from the reduction point was 100 mm to 1800 mm. Furthermore, condition no.
  • condition No. 6 was condition No.
  • the use efficiency of cooling water was higher than 3. From the above, it has been confirmed that the grain refinement is promoted by setting V1 ⁇ V2 and P1 ⁇ P2, and that the cooling water use efficiency is improved by increasing the difference between V1 and V2 and the difference between P1 and P2. It was done.
  • the apparatus for cooling a hot-rolled steel sheet, the method for cooling a hot-rolled steel sheet, the apparatus for manufacturing a hot-rolled steel sheet, and the method for manufacturing a hot-rolled steel sheet according to the present invention can be used for manufacturing a hot-rolled steel sheet having ultrafine crystal grains. Moreover, the hot-rolled steel sheet having ultrafine crystal grains can be used as a material used for applications such as automobiles, household appliances, machine structures, and buildings.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
PCT/JP2010/060971 2009-06-30 2010-06-28 熱延鋼板の冷却装置、冷却方法、製造装置、及び、製造方法 WO2011001935A1 (ja)

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KR1020117027955A KR101362566B1 (ko) 2009-06-30 2010-06-28 열연 강판의 냉각 장치, 냉각 방법, 제조 장치, 및, 제조 방법
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JP2013151021A (ja) * 2011-12-26 2013-08-08 Jfe Steel Corp 圧延要領決定方法
JP2014043631A (ja) * 2012-08-28 2014-03-13 Nippon Steel & Sumitomo Metal 細粒鋼板の製造方法
US9833823B2 (en) 2013-05-03 2017-12-05 Sms Group Gmbh Method for producing a metal strip

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DE102012223848A1 (de) * 2012-12-19 2014-06-26 Sms Siemag Ag Vorrichtung und Verfahren zum Kühlen von Walzgut
WO2018055918A1 (ja) 2016-09-23 2018-03-29 新日鐵住金株式会社 熱延鋼板の冷却装置及び冷却方法
CN109715306B (zh) * 2016-09-23 2022-01-14 日本制铁株式会社 热轧钢板的冷却装置和冷却方法

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JP2013151021A (ja) * 2011-12-26 2013-08-08 Jfe Steel Corp 圧延要領決定方法
JP2014043631A (ja) * 2012-08-28 2014-03-13 Nippon Steel & Sumitomo Metal 細粒鋼板の製造方法
US9833823B2 (en) 2013-05-03 2017-12-05 Sms Group Gmbh Method for producing a metal strip

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