EP4066956A1 - Fertigungsanlage und verfahren zur herstellung einer stahlplatte - Google Patents

Fertigungsanlage und verfahren zur herstellung einer stahlplatte Download PDF

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Publication number
EP4066956A1
EP4066956A1 EP20893260.8A EP20893260A EP4066956A1 EP 4066956 A1 EP4066956 A1 EP 4066956A1 EP 20893260 A EP20893260 A EP 20893260A EP 4066956 A1 EP4066956 A1 EP 4066956A1
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EP
European Patent Office
Prior art keywords
steel plate
flattening
temperature
cooling
flattening device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20893260.8A
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English (en)
French (fr)
Other versions
EP4066956A4 (de
Inventor
Satoshi Ueoka
Yuta TAMURA
Yusuke Nojima
Takahiro Hirano
Ken Miura
Ori Kumano
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JFE Steel Corp
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JFE Steel Corp
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Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Publication of EP4066956A1 publication Critical patent/EP4066956A1/de
Publication of EP4066956A4 publication Critical patent/EP4066956A4/de
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0056—Furnaces through which the charge is moved in a horizontal straight path
    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • 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
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/05—Stretching combined with rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/60—Aqueous agents
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/63—Quenching devices for bath quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0242—Flattening; Dressing; Flexing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B21B2001/221—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 plates, strips, bands or sheets of indefinite length by cold-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers

Definitions

  • the present invention relates to manufacturing equipment and a manufacturing method for a steel plate.
  • cooling from a high temperature is often performed to adjust mechanical properties such as strength. Cooling is roughly divided into an online water cooling method and an offline water cooling method.
  • the online water cooling method the steel plate after hot rolling is water-cooled by using a water cooling device connected online.
  • the offline water cooling method the rolled material is once cooled to room temperature, and then heated and water-cooled again in a heat treatment furnace connected offline.
  • the online water cooling method is advantageous, but since the steel plate is likely to warp or the like during rolling, it is not possible to dispose a cooling device near the rolling mill. As a result, since the temperature drops during transportation to the cooling device after rolling, there is a problem that water cooling cannot be performed at an appropriate temperature.
  • the offline water cooling method is advantageous for adjusting the mechanical properties because the cooling device is disposed on the outlet side of the heating furnace and quenching can be performed from a temperature substantially equal to the heating temperature.
  • a hot-rolled steel plate is likely to have temperature unevenness during cooling due to differences in the temperature distribution, shape, or surface condition of the steel plate immediately after rolling. Furthermore, the temperature unevenness of the steel plate may be caused by the performance of the cooling device. When the temperature unevenness of the steel plate occurs, deformation of the steel plate, residual stress, material variation, and the like occur after cooling.
  • various cooling devices capable of uniform cooling have been developed. However, the method developed is only an improvement of the cooling device, and in particular, flattening of the steel plate after cooling is not completely achieved. Poor shape of the steel plate after cooling causes operational troubles such as a plate passage failure in the manufacturing line, and requires a precision treatment by a press or a flattening device in a subsequent step, resulting in high cost.
  • temperature unevenness of the steel plate There are two types of temperature unevenness of the steel plate, one is due to the design of the cooling nozzle and the other is due to the shape of the steel plate during rolling. Depending on the design of a cooling nozzle, temperature deviation on the upper and lower surfaces and temperature non-uniformity in the width direction may occur. On the other hand, when the shape of the steel plate during rolling is poor, the cooling water does not flow evenly on the steel plate, and the cooling capacity changes depending on the location, resulting in temperature unevenness.
  • PTLs 1 and 2 propose an online process of flattening with a first flattening device, accelerated cooling, and then final flattening with a second flattening device.
  • a large effect cannot be obtained on the generation of temperature unevenness caused by the cooling nozzle and the cooling strain caused by the temperature unevenness, such as the temperature deviation on the upper and lower surfaces and the uniformity in the width direction described above.
  • the offline heat treatment equipment in the related art is disposed in the order of a heating furnace, a quenching device, and a flattening device.
  • the quenching device cools to 100°C or less, and even when the cooling uniformity is not ensured, the final cooling stop temperature of the steel plate is constant because it is cooled to a low temperature close to the water temperature of the cooling water. Therefore, the uniformity of cooling was not considered.
  • cooling may be completed at a temperature higher than room temperature such as 100°C or higher. In that case, when the cooling is not uniform, since the temperature of the steel plate after cooling also varies, not only the predetermined quality cannot be ensured, but also the steel plate is distorted due to the difference in thermal expansion in the plane of the steel plate temperature.
  • the present invention has been made in view of such circumstances, and it is an object of the present invention to provide manufacturing equipment and a manufacturing method for a steel plate capable of performing more uniform cooling during heat treatment of the steel plate and manufacturing a flat and homogeneous steel plate.
  • manufacturing equipment for a steel plate in which the steel plate is heat-treated, the equipment including a heating furnace configured to heat the steel plate having a temperature of 100°C or lower, a first flattening device configured to flatten the heated steel plate, a quenching device configured to quench the flattened steel plate, and a second flattening device configured to flatten the quenched steel plate.
  • a manufacturing method for a steel plate in which the steel plate is heat-treated, the method including a heating step of heating the steel plate having a temperature of 100°C or lower, a first flattening step of flattening the steel plate after the heating, a quenching step of quenching the steel plate after the first flattening step, and a second flattening step of flattening the steel plate after the quenching.
  • manufacturing equipment and a manufacturing method for a steel plate capable of performing more uniform cooling during heat treatment of the steel plate and manufacturing a flat and homogeneous steel plate.
  • FIG. 1 illustrates a schematic configuration of heat treatment equipment 1 for a steel plate 2, which is manufacturing equipment for a steel plate according to an embodiment of the present invention
  • FIG. 2 illustrates a detailed configuration of each of a first flattening device 4 and a quenching device 5 in the present embodiment.
  • the heat treatment equipment 1 is equipment for heat-treating the steel plate 2, and is provided with a heating furnace 3, the first flattening device 4, the quenching device 5, and a second flattening device 6.
  • FIG. 1 illustrates a schematic configuration of heat treatment equipment 1 for a steel plate 2, which is manufacturing equipment for a steel plate according to an embodiment of the present invention
  • FIG. 2 illustrates a detailed configuration of each of a first flattening device 4 and a quenching device 5 in the present embodiment.
  • the main focus is on adjusting the mechanical properties of the material with offline heat treatment equipment that is not directly connected to a rolling line, and the heat treatment equipment 1 is not directly connected to the rolling line.
  • the heat treatment equipment 1 is equipment for heat-tre
  • the heating furnace 3, the first flattening device 4, the quenching device 5, and the second flattening device 6 are disposed in this order from the upstream side in the transport direction of the steel plate 2. Furthermore, a transport roller (not illustrated) for transporting the steel plate 2 is provided between each of the heating furnace 3, the first flattening device 4, the quenching device 5, and the second flattening device 6.
  • the heating furnace 3 heats the steel plate 2 having a temperature of 100°C or lower after hot rolling to the austenite temperature range.
  • the steel plate 2 has a plate thickness of 4.0 mm or more.
  • the first flattening device 4 is a device for flattening the steel plate 2 heated in the heating furnace 3, and is provided between the heating furnace 3 and the quenching device 5.
  • a reduction type skin pass flattening device or a repeatedly bending type roller leveler flattening device can be used.
  • the temperature of the steel plate 2 drops from the time when the steel plate 2 is extracted from the heating furnace 3 to the time when the steel plate 2 reaches the first flattening device 4.
  • the smaller the temperature drop the smaller the increase in the deformation resistance of the steel plate 2, and the shape can be flattened with a small flattening force. Therefore, it is preferable that the distance from the heating furnace 3 to the first flattening device 4 is 4 m or less.
  • the first flattening device 4 is preferably small in size and has a small installation space to shorten the transport time from the heating furnace 3 to the quenching device 5.
  • the first flattening device 4 it is preferable to use a flattening device having a lower load capacity than that of the second flattening device 6 to flatten the steel plate 2 having a relatively low deformation resistance during heat.
  • the first flattening device 4 may have a load capacity of at least 500 tons, and preferably approximately 3000 tons.
  • ton indicates metric ton.
  • the quenching device 5 is a device for quenching the steel plate 2 shape-flattened by the first flattening device 4 by water cooling. As illustrated in FIG. 2 , the quenching device 5 includes an upper cooling nozzle 51 and a lower cooling nozzle 52 as a device for rapidly cooling the steel plate 2 after flattening. A plurality of upper cooling nozzles 51 and a plurality of lower cooling nozzles 52 are provided in the width direction of the steel plate 2 in pairs in the vertical direction with respect to the transport line, and are arranged at a plurality of locations side by side at a predetermined pitch along the transport direction of the steel plate 2.
  • Cooling water 53 is sprayed toward the steel plate 2 from each of the cooling nozzles of the upper cooling nozzles 51 and the lower cooling nozzles 52.
  • each of restraint rolls 50 may be installed before and after the upper cooling nozzle 51 and the lower cooling nozzle 52.
  • the second flattening device 6 is a device for flattening the steel plate 2 quenched by the quenching device 5, and is provided on the outlet side of the quenching device 5 (downstream side in the transport direction of the steel plate 2).
  • a reduction type skin pass flattening device As the second flattening device 6, a reduction type skin pass flattening device, a repeatedly bending type roller leveler flattening device, or a press type flattening device can be used.
  • the second flattening device 6 preferably has a high flattening reaction force in terms of performing flattening of the steel plate 2 near room temperature, and preferably has a load capacity of at least 2000 tons.
  • a steel plate 2 having a predetermined thickness (for example, 30 mm) and width (for example, 2000 mm) is manufactured by hot rolling using a slab or the like as a material in a hot rolling line (not illustrated) different from the heat treatment equipment 1.
  • a hot rolling line (not illustrated) different from the heat treatment equipment 1.
  • the hot-rolled steel plate 2 is cooled to room temperature, and then the scale is removed by a surface scale removing device (not illustrated).
  • the steel plate 2 from which the scale is removed is charged into the heating furnace 3 and heated to an austenite temperature range (for example, approximately 910°C) (heating step).
  • an austenite temperature range for example, approximately 910°C
  • the steel plate 2 is extracted from the heating furnace 3, is transported to the first flattening device 4 by a plurality of table rolls (not illustrated) installed on the outlet side of the heating furnace 3, and is flattened by the first flattening device 4 (first flattening step).
  • the reason for installing the first flattening device 4 in front of the quenching device 5 (on the upstream side in the transport direction of the steel plate 2) will be described below.
  • the steel plate 2 is hot-rolled in advance to a predetermined thickness and width on a hot rolling line different from the heat treatment equipment 1.
  • a shape defect occurs after cooling.
  • the heat treatment equipment 1 since the steel plate 2 is inserted into the heating furnace 3 with the shape defect occurring, the shape defect remains even when the steel plate 2 is uniformly heated in the heating furnace 3.
  • the first flattening device 4 is preferably a roller leveler flattening device capable of repeated bending than a skin pass flattening device having a low flattening ability for the warp in the longitudinal direction generated at the tip tail end portion of the steel plate 2.
  • the roller leveler flattening device is a flattening machine that repeatedly bends with a plurality of rolls (for example, four on the upper surface and three on the lower surface), and the flattening effect is relatively low at a distance corresponding to the roll pitch. Therefore, in a case where a roller leveler flattening device is used, it is more preferable to further provide a press type flattening mechanism or the like capable of correcting the warp of the tip tail end portion of the steel plate 2.
  • the temperature of the steel plate 2 when flattening the shape by the first flattening device 4 is preferably in the range of the temperature Ar 3 temperature ⁇ 150°C at which the austenite of the steel plate 2 is transformed into ferrite.
  • the yield stress of the steel plate 2 is sufficiently low, and the reaction force when flattening the shape can be reduced.
  • the steel plate 2 is quenched by the quenching device 5 (quenching step).
  • the steel plate 2 is flattened by the second flattening device 6 (second flattening step).
  • second flattening step In quenching (cooling) by the quenching device 5, it is difficult to control the flow rates of the cooling water 53 ejected from the upper cooling nozzle 51 and the lower cooling nozzle 52 to be completely matched in the width direction. Therefore, there remains a risk of slight warpage due to temperature unevenness during quenching, and thus it is necessary to further flatten the steel plate 2 with the second flattening device 6.
  • the temperature of the steel plate 2 is 100°C or lower when flattening by the second flattening device 6.
  • the steel plate 2 has a plate thickness of 4.0 mm or more, and the present invention is not limited to this example.
  • the steel plate may have a plate thickness of less than 4.0 mm.
  • the present invention is suitable for a steel plate having a plate thickness of 4.0 mm or more, and is more suitable for a steel plate having a plate thickness of 6.0 mm or more.
  • Manufacturing equipment (heat treatment equipment 1) for a steel plate is manufacturing equipment for a steel plate, in which the steel plate is heat-treated, and includes the heating furnace 3 configured to heat the steel plate having a temperature of 100°C or lower, the first flattening device 4 configured to flatten the heated steel plate, the quenching device 5 configured to quench the flattened steel plate, and the second flattening device 6 configured to flatten the quenched steel plate.
  • the steel plate by flattening the steel plate with the first flattening device 4, cooling when quenching can be made uniform. Therefore, the steel plate can be made flat and homogeneous. In addition, by flattening the steel plate with the second flattening device 6 after quenching, the finally manufactured steel plate can be flattened even in a case where the cooling of the quenching device 5 is uneven.
  • the load capacity of the first flattening device 4 is lower than the load capacity of the second flattening device 6.
  • the load capacity can be optimized according to the difference in deformation resistance due to the difference in the temperature of the steel plate, and since the first flattening device 4 does not use a flattening device with a high load capacity, the initial equipment introduction cost is low.
  • the temperature of the steel plate is in the range of Ar 3 temperature ⁇ 150°C when the steel plate is flattened by the first flattening device 4.
  • the yield stress of the steel plate is sufficiently low, and the reaction force when flattening the shape can be reduced.
  • a temperature of the steel plate is 100°C or lower when the steel plate is flattened by the second flattening device 6.
  • the flattening temperature is substantially room temperature, and after flattening, re-deformation due to heat shrinkage due to a further temperature drop does not occur, a good shape can be obtained.
  • the first flattening device 4 and the second flattening device 6 are roller leveler flattening devices.
  • the quenching device quenches the steel plate by water cooling.
  • a method for manufacturing a steel plate according to another aspect of the present invention is a manufacturing method for a steel plate, in which the steel plate is heat-treated, and includes a heating step of heating the steel plate 2 having a temperature of 100°C or lower, a first flattening step of flattening the steel plate after the heating, a quenching step of quenching the steel plate after the first flattening step, and a second flattening step of flattening the steel plate after the quenching.
  • a temperature of the steel plate when flattening is in the range of Ar 3 temperature ⁇ 150°C.
  • a temperature of the steel plate is 100°C or lower.
  • a steel plate 2 (plate thickness 6 mm, 12 mm, 25 mm, 40 mm x plate width 3500 mm x plate length 7 m) in a room temperature state from which scale was removed by shot blasting in advance was heated in the heating furnace 3 to 900°C in a nitrogen atmosphere.
  • the heated steel plate 2 was extracted, the steel plate 2 was flattened by the first flattening device 4 (roller leveler type), and quenched to 100°C or lower by the quenching device 5.
  • the quenched steel plate 2 was shape-flattened again by the second flattening device 6.
  • the quenching device 5 used a spray nozzle as the cooling nozzles 51 and 52.
  • the temperature of Ar 3 of this material was 800°C, and the temperature of the steel plate 2 when extracted from the heating furnace 3 and flattened by the first flattening device 4 was approximately 860°C.
  • the shape of the steel plate when the heat treatment of the steel plate 2 was performed with the above equipment arrangement was investigated.
  • the results were as illustrated in Examples 1 to 4 in Table 1.
  • the allowable value of the amount of warpage of the steel plate 2 is 5 mm or less.
  • the amount of warpage was 5 mm or less, and the shape was good (evaluation: o).
  • the heat treatment was performed under the condition that neither the first flattening device 4 nor the second flattening device 6 was used (Comparative Examples 1 to 4), the condition that only the second flattening device 6 was used for flattening without using the first flattening device 4 (Comparative Examples 5 to 8), and the condition that only the first flattening device 4 was used for flattening without using the second flattening device 6 (Comparative Examples 9 to 12).
  • the shape of the steel plate for the heat-treated steel plate 2 was investigated in the same manner as in the examples. Except for the above conditions, the heat treatment was performed under the same conditions as in the examples.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Metal Rolling (AREA)
EP20893260.8A 2019-11-25 2020-11-18 Fertigungsanlage und verfahren zur herstellung einer stahlplatte Pending EP4066956A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019212625 2019-11-25
PCT/JP2020/043061 WO2021106723A1 (ja) 2019-11-25 2020-11-18 鋼板の製造設備及び製造方法

Publications (2)

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EP4066956A1 true EP4066956A1 (de) 2022-10-05
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