US20240318272A1 - Quenching apparatus, method for quenching, method for manufacturing cold rolled steel sheet, and method for manufacturing coated steel sheet - Google Patents

Quenching apparatus, method for quenching, method for manufacturing cold rolled steel sheet, and method for manufacturing coated steel sheet Download PDF

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US20240318272A1
US20240318272A1 US18/580,482 US202218580482A US2024318272A1 US 20240318272 A1 US20240318272 A1 US 20240318272A1 US 202218580482 A US202218580482 A US 202218580482A US 2024318272 A1 US2024318272 A1 US 2024318272A1
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rolls
metal sheet
quenching
steel sheet
bath
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Soshi Yoshimoto
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JFE Steel Corp
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JFE Steel Corp
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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
    • C21D9/52—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
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • 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
    • 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
    • C21D8/0247—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
    • 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
    • C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface 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
    • C21D9/46—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
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C21D9/5735—Details
    • C21D9/5737—Rolls; Drums; Roll arrangements
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/22—Electroplating: Baths therefor from solutions of zinc

Definitions

  • This application relates to a quenching apparatus, a method for quenching, a method for manufacturing a cold rolled steel sheet, and a method for manufacturing a coated steel sheet. More particularly, the application relates to a quenching apparatus that facilitates, for increasing versatility of manufacturing conditions, switching between a condition of performing quenching and a condition of not performing the quenching in a continuous annealing facility that performs annealing while a metal sheet continuously passes therethrough.
  • the quality of the material is made up by, for example, heating and then cooling the metal sheets so as to cause phase transformation.
  • a cooling apparatus is proposed in Patent Literature 1.
  • cooling water injection nozzles are provided in multi-stages in immersion water that cools a heated strip, and headers of the nozzles are set independent from each other and disposed so as to be spaced from each other in a traveling direction of the strip.
  • gaps are formed between the nozzle headers, and a jet of cooling water caused to strike a surface of the strip to be cooled is caused to flow to the rear side of the headers through the gaps between the headers. This prevents side flows that would otherwise be generated with the related-art multi-stage nozzles, and uniformity in cooling in the sheet width direction is achieved.
  • Patent Literature 2 a technique has been proposed in Patent Literature 2.
  • reflectors that are formed of a metal sheet or a heat insulating material and that suppress radiation and thermal conduction from a steel strip are provided between water injection nozzles and the steel strip, and, when a steel strip high-temperature condition under which the steel strip is not cooled with the water injection nozzles is changed to a quenching condition under which the steel strip is cooled with the water injection nozzles, a cooling gas is supplied to the water injection nozzles from a cooling gas supplying section.
  • the steel strip In removing the water from the steel strip after the quenching, the steel strip is pressed with a pair of pressure rolls installed so as to be shifted from each other in the longitudinal direction of the steel strip while a pair of slit nozzles are moved close to the steel strip and a gas is injected to remove the water.
  • the disclosed embodiments have been made to solve the problems as described above, and the object of the disclosed embodiments is to provide a quenching apparatus.
  • this quenching apparatus produces a good cooling effect on the metal sheet.
  • this quenching apparatus can prevent thermal deformation of the apparatus.
  • this quenching apparatus facilitates switching between a condition of performing the quenching and a condition of not performing the quenching.
  • the inventors have diligently studied to solve the problems as described above and, as a result, obtained the following findings and conception.
  • a steam film generated on the surface of the metal sheet is removed by a striking pressure of water injected from the water injection nozzles so as to uniformly perform the quenching.
  • the condition is switched to a condition of not using the water injection nozzles, the water injection nozzles, reflectors, and the like undergo thermal deformation.
  • the steam film generated on the surface of the metal sheet can be removed by a different apparatus that can suppress thermal deformation without using the water injection nozzles, the reflectors, or the like, it is not required to open the furnace of the annealing facility in switching between the condition of performing the quenching and the condition of not performing the quenching.
  • thermal deformation of the water injection nozzles and the like can be suppressed.
  • a quenching apparatus that cools a metal sheet, the apparatus including
  • the quenching apparatus according to [1] or [2] is installed on an exit side of a soaking furnace of a continuous annealing facility.
  • the method includes the steps of
  • the metal sheet is the cold rolled steel sheet, and the cold rolled steel sheet that has been annealed is quenched with the method for quenching according to [4] or [5].
  • the coating treatment is one treatment selected from an electrogalvanizing treatment, a hot-dip galvanizing treatment, and a hot-dip galvannealing treatment.
  • the quenching apparatus is provided as follows. In the case where quenching in which the metal sheet heated in, for example, the continuous annealing facility is immersed in the cooling medium is performed, this quenching apparatus produces a good cooling effect on the metal sheet. In addition, in the case where the quenching in which the metal sheet is immersed in the cooling medium is not performed, this quenching apparatus can prevent thermal deformation of the apparatus. Furthermore, this quenching apparatus facilitates switching between the condition of performing the quenching and the condition of not performing the quenching.
  • the metal sheet for example, the steel sheet heated in the continuous annealing facility that performs annealing while causing the metal sheet to continuously pass therethrough
  • the need for the following work is dropped: opening the furnace of the continuous annealing facility; removing members that is disposed in the bath of the quenching apparatus for preventing thermal deformation caused by thermal radiation from the metal sheet; and installing the reflectors to prevent thermal deformation in the bath. Accordingly, the switching is facilitated.
  • both the metal sheet required to be quenched and the metal sheet not required to be quenched can be manufactured with a single quenching apparatus with high productivity.
  • thermal deformation caused by thermal radiation from the metal sheet can be suppressed.
  • FIG. 1 is a view (side view) of a quenching apparatus according to an embodiment, illustrating a state of the quenching apparatus under a condition of performing quenching.
  • FIG. 2 is a view (side view) of the quenching apparatus according to the embodiment, illustrating a state of the quenching apparatus under a condition of not performing the quenching.
  • FIG. 3 is a schematic view of a movement mechanism for rolls in the quenching apparatus according to the embodiment.
  • FIGS. 1 and 2 are diagrams (side views) of a quenching apparatus 11 according to an embodiment respectively illustrating a state of the quenching apparatus 11 under a condition of performing quenching and a state of the quenching apparatus 11 under a condition of not performing the quenching.
  • This quenching apparatus 11 can be applied to, for example, a cooling facility installed on an exit side of a soaking furnace of a continuous annealing apparatus.
  • the quenching apparatus 11 includes a bath (water bath) 5 in which a cooling medium (liquid, according to the present embodiment, water) 2 is contained, a sink roll 3 that changes a running direction of a metal sheet 1 , and rolls (agitation rolls) 4 that rotate at high speed.
  • the rolls 4 are operated in the form of a set of two rolls 4 (a roll 4 a and a roll 4 b ). At least a pair of the rolls 4 are disposed in the bath 5 .
  • the rolls 4 agitate and remove a steam film generated on the surface of the metal sheet 1 during the quenching in which the metal sheet 1 is immersed in the cooling medium. That is, the steam film on the metal surface, which is removed by injecting the cooling medium (water) through the nozzles according to the related art, is removed by agitation with the rolls according to the disclosed embodiments, and thereby the same effect of cooling is obtained.
  • the rolls 4 are disposed with the metal sheet 1 running in the bath 5 (in the cooling medium 2 ) interposed therebetween, specifically, disposed at positions that face each other with the metal sheet 1 interposed therebetween in the bath 5 .
  • the quenching apparatus 11 illustrated in FIG. 1 six pairs of rolls are spaced by a predetermined pitch from the top toward the bottom of the bath 5 along the running direction of the metal sheet 1 .
  • arrows illustrated in the rolls 4 indicate the rotation direction of the rolls 4 .
  • an arrow illustrated along the metal sheet 1 indicates the running direction of the metal sheet 1 .
  • the rolls 4 (the rolls 4 a and the rolls 4 b ) are disposed at positions where the effect of removing the steam film generated on the surface of the metal sheet 1 when the metal sheet 1 is quenched can be obtained.
  • the quenching refers to a process in which the metal sheet 1 heated as a result of annealing or the like is immersed in the cooling medium (a liquid, according to the present embodiment, water) so as to be cooled.
  • the rolls 4 a and the rolls 4 b are each disposed in a range between a position where an outer periphery of the roll is in contact with the metal sheet 1 and a position where the perimeter of the roll is spaced from the metal sheet 1 by smaller than or equal to 50 mm in side view of the quenching apparatus 11 .
  • the rolls 4 are disposed at positions where the outer periphery of the rolls are in contact with the metal sheet 1 . In this case, the most significant effect can be obtained.
  • the rolls 4 rotate at a peripheral speed higher than or equal to a running speed of the metal sheet 1 .
  • the peripheral speed of the rolls 4 is preferably a relative speed higher than or equal to 1.0 times the running speed of the metal sheet 1 .
  • the peripheral speed of the rolls 4 is a relative speed lower than 1.0 times the running speed of the metal sheet 1 .
  • the peripheral speed of the rolls 4 is preferably a relative speed lower than or equal to 3.0 times the running speed of the metal sheet 1 .
  • the rolls 4 are preferably rotated in a reverse direction to the running direction of the metal sheet 1 (see FIG. 1 ).
  • the maximum height roughness Rz of the surfaces of the rolls 4 is preferably greater than or equal to 10 ⁇ m.
  • the maximum height roughness Rz of the roll surface is greater than or equal to 10 ⁇ m, the agitating performance is improved.
  • the effect of removing the steam film from the surface of the metal sheet 1 is more improved, and accordingly, a better effect of cooling is easily obtained.
  • the maximum height roughness Rz of the surfaces of the rolls 4 is preferably smaller than or equal to 50 ⁇ m.
  • the maximum height roughness Rz of the roll surface is defined by JIS B 0601 (2001) and can be measured by a measurement method described in JIS B 0633.
  • the measurement method may be a stylus type or a non-contact type.
  • the quenching apparatus 11 may include a control device (not illustrated) that controls the rotation speed and the rotation direction of the rolls 4 (the rolls 4 a and the rolls 4 b ) as described above.
  • the rotation speed and the rotation direction of the rolls 4 may be controlled by controlling output of main machine motors 45 that rotate and drive the rolls 4 (see FIG. 3 ) by using the control device with spindles 44 interposed therebetween.
  • a roll diameter of the rolls 4 is preferably greater than or equal to 50 mm.
  • the roll diameter of the rolls 4 is preferably smaller than or equal to 250 mm.
  • the agitating performance is improved.
  • the effect of removing the steam film from the surface of the metal sheet 1 is more improved, and accordingly, a better effect of cooling is easily obtained.
  • the number of rolls disposed in the bath 5 is not limited, it is required that at least a pair of rolls be disposed such that the metal sheet 1 is interposed between the pair of rolls. Furthermore, a plurality of rolls are preferably disposed on each of the front surface side and the rear surface side of the metal sheet 1 . With this configuration, the steam film can be more uniformly and more reliably removed, and accordingly, stable cooling power is obtained.
  • the numbers of rolls disposed on the front surface side and the rear surface side of the metal sheet 1 are preferably the same, and each of the rolls disposed on the front surface side is preferably paired with a corresponding one of the rolls disposed on the rear surface side.
  • the number of rolls to be disposed is preferably greater than or equal to three pairs. When the number of rolls to be disposed is greater than or equal to three pairs, the steam film on the surface of the metal sheet 1 can be more uniformly and more reliably removed, and accordingly, stable cooling power is easily obtained.
  • an upper limit of the number of rolls 4 to be disposed is not particularly defined, the number of rolls to be disposed is preferably smaller than or equal to ten pairs. When the number of rolls to be disposed is smaller than or equal to ten pairs, it is preferable in terms of the cost.
  • the rolls may be in contact or not in contact with each other.
  • the quenching apparatus agitates the cooling medium (the liquid) with the rolls to obtain the effect of removing the steam film from the surface of the metal sheet, and accordingly, obtain a better effect of cooling on the metal sheet.
  • cooling water injection nozzles be installed in the bath of the quenching apparatus.
  • the rolls 4 (the rolls 4 a and the rolls 4 b ) be formed of a material that has strength to withstand the reaction force of the metal sheet 1 .
  • the material of the rolls 4 include, for example, SUS304, SUS310, ceramic, and so forth.
  • FIG. 2 illustrates a state of the quenching apparatus 11 under the condition of not performing the quenching.
  • the difference between FIG. 1 and FIG. 2 is only the state of the quenching apparatus 11 (the state of performing the quenching and the state of not performing the quenching), and the basic configuration of the quenching apparatus 11 is the same. Accordingly, elements corresponding to those of the quenching apparatus 11 illustrated in FIG. 1 are denoted by the same reference numerals so as to omit the detailed description thereof.
  • the cooling medium (water) 2 contained in the bath 5 in the state illustrated in FIG. 1 is discharged, and the bath 5 is empty.
  • the cooling medium having been contained in the bath 5 may be completely discharged from the bath 5 or left in the bath 5 to such a degree that the metal sheet 1 is not immersed.
  • the position of each of the rolls 4 (the rolls 4 a and the rolls 4 b ) is changed to a position spaced farther from the metal sheet 1 than the position in the case of performing the quenching (in other words, the spacing between the rolls 4 a and the rolls 4 b is increased). That is, the distances between the rolls 4 according to the present embodiment and the metal sheet 1 can be changed.
  • the rolls 4 include a drive mechanism (a motor) that moves the rolls 4 to positions space from the metal sheet 1 .
  • a technique is not particularly limited as long as the rolls 4 can be moved as described above. However, when the responsivity is considered, electrical type is more preferable.
  • FIG. 3 a movement mechanism of the rolls 4 (the rolls 4 a and the rolls 4 b ) is illustrated in FIG. 3 .
  • FIG. 3 ( a ) is a bird's eye view when the movement mechanism is looked down from above
  • FIG. 3 ( b ) is a side view of part of the movement mechanism seen from the side.
  • Examples of the movement mechanism of the rolls 4 include, for example, a mechanism that changes the distances between the rolls 4 (the rolls 4 a and the rolls 4 b ) and the metal sheet 1 as in the embodiment illustrated in FIG. 3 .
  • arms (arms with a linear guide) 6 connected to bearing mechanisms 43 at both the ends of each rotation shaft 41 of the rolls 4 (the rolls 4 a and the rolls 4 b ) are installed so as to surround the outer periphery of the bath 5 , and, with electrical jacks 7 , the rolls 4 (the rolls 4 a and the rolls 4 b ) are moved entirely with the arms 6 in the horizontal direction.
  • the arms 6 are installed in the rolls 4 (the rolls 4 a and the rolls 4 b ) on both the front and rear surface sides of the metal sheet 1 and moved in the horizontal direction.
  • a sealing mechanism 42 may be installed as appropriate in a region where the rotation shafts 41 of the rolls 4 and the bath 5 are connected to each other.
  • the rolls 4 in order to reduce thermal radiation from the metal sheet 1 , it is sufficient that the rolls 4 (the rolls 4 a and the rolls 4 b ) be spaced away from the metal sheet 1 . At this time, it is preferable that the rolls 4 a and the rolls 4 b be spaced from the metal sheet 1 as much as possible. It is also preferable that the distances between the rolls 4 a and the metal sheet 1 and the distances between the rolls 4 b and the metal sheet 1 be greater than or equal to 200 mm. Specifically, as illustrated in FIG.
  • the distances between the rolls 4 a and the metal sheet 1 and the distances between the rolls 4 b and the metal sheet 1 be positions spaced by greater than or equal to 200 mm in the horizontal direction.
  • operation may be performed while the rotation of the rolls 4 is stopped.
  • the distances between the rolls 4 (the rolls 4 a and the rolls 4 b ) and the metal sheet 1 can be changed depending on the condition whether the quenching is performed ( FIG. 1 or 2 ).
  • the rolls 4 are moved close to the metal sheet 1 , and the steam film of the metal sheet 1 is agitated and removed by the rolls 4 to cool the metal sheet 1 so as to ensure sufficient cooling power.
  • the need for installing nozzles to cool the metal sheet 1 can be dropped.
  • the rolls 4 can be moved away from the metal sheet 1 to suppress thermal deformation of the rolls 4 due to thermal radiation from the metal sheet 1 .
  • the need for installing reflectors or consideration of deformation of the nozzles in the bath is dropped.
  • the quenching is performed, a good cooling effect on the metal sheet 1 is obtained.
  • the need for the following work is dropped: opening a furnace of the continuous annealing facility; removing members such as cooling water injection nozzles that is disposed in the bath of the quenching apparatus for preventing thermal deformation caused by thermal radiation from the metal sheet 1 ; and installing reflectors or the like to prevent thermal deformation in the bath. Accordingly, the switching is facilitated.
  • both the metal sheet required to be quenched and the metal sheet not required to be quenched can be manufactured with a single quenching apparatus with high productivity.
  • the disclosed embodiments are preferably applied to a method for manufacturing a steel sheet.
  • the quenching apparatus according to the disclosed embodiments when installed on the exit side of a soaking furnace of a continuous annealing facility through which steel sheets of different steel types continuously pass, the quenching apparatus can be more effectively used.
  • the quenching apparatus can also be used for shape correction of the metal sheet by adjusting installation positions of the rolls and disposition relationship with the metal sheet running in the bath of the quenching apparatus.
  • Examples of the above-described steel sheet include a cold rolled steel sheet, and a hot-dip galvanized steel sheet, an electrogalvanized steel sheet, a hot-dip galvannealed steel sheet, and the like that are made by performing a surface treatment on the cold rolled steel sheet.
  • the disclosed embodiments are preferably applied to a method for manufacturing a cold rolled steel sheet in which an annealed cold rolled steel sheet is quenched and to a method for manufacturing a coated steel sheet in which the cold rolled steel sheet is further subjected to a coating treatment.
  • the coating treatment is at least one treatment selected from an electrogalvanizing treatment, a hot-dip galvanizing treatment, a hot-dip galvannealing treatment, and the like.
  • the disclosed embodiments are not limited to examples of manufacturing steel sheets but are applicable to manufacturing of metal sheets in general other than steel sheets.
  • a cooling apparatus used after high-tensile steel sheets having a thickness of 0.8 to 2.3 mm had undergone a treatment in a continuous annealing facility was changed.
  • examples are described in which a quenching apparatus was installed on the exit side of the continuous annealing facility, the above-described high-tensile steel sheets were annealed in the continuous annealing facility, and, after that, a steel sheet (coil) of a tensile strength target of 780 to 1470 MPa and a steel sheet (coil) of a tensile strength target of 340 to 590 MPa were manufactured with the same quenching apparatus.
  • a quenching apparatus described in Patent Literature 2 was installed on the exit side of the continuous annealing facility.
  • the quenching water quenching
  • 200 pieces of the coil of a tensile strength target of 780 to 1470 MPa were manufactured.
  • 200 pieces of the coil of a tensile strength target of 340 to 590 MPa were manufactured.
  • the above-described quenching apparatus 11 (excepting that the rolls 4 (the rolls 4 a and the rolls 4 b ) were forcibly fixed so as not to rotate) was installed on the exit side of the continuous annealing facility.
  • the quenching water quenching
  • the positions of the rolls 4 were positions where the rolls 4 were in contact with the steel sheet running in the water bath 5 .
  • the above-described quenching apparatus 11 was installed on the exit side of the continuous annealing facility.
  • the quenching water quenching
  • water quenching water quenching
  • the rolls 4 the rolls 4 a and the rolls 4 b
  • the positions of the rolls 4 were positions where the rolls 4 were in contact with the steel sheet running in the water bath 5 .
  • the maximum height roughness Rz of the roll 4 surface was set to 20 ⁇ m
  • the roll diameter of the rolls 4 was set to 150 mm.
  • the rotation directions of the steel sheet and the rolls 4 were set to be the same, and the rolls were rotated at a peripheral speed 2.0 times the steel sheet running speed (when the steel sheet was 1000 mm/s, the roll peripheral speed was 2000 mm/s; the peripheral speed of the rolls was a relative speed 2.0 times the running speed of the metal sheet 1 ).
  • the rolls were rotated at a peripheral speed 2.0 times the steel sheet running speed (when the steel sheet was 1000 mm/s, the roll peripheral speed was 2000 mm/s; the peripheral speed of the rolls was a relative speed 2.0 times the running speed of the metal sheet 1 ).
  • the rotation directions of the steel sheet and the rolls 4 were set to be reverse to each other, and the rolls 4 (the rolls 4 a and the rolls 4 b ) were rotated at the peripheral speed that is the same as the steel sheet running speed (when the steel sheet was 1000 mm/s, the roll peripheral speed was 1000 mm/s; the peripheral speed of the rolls 4 was a relative speed 2.0 times the running speed of the metal sheet 1 ).
  • the rolls 4 were rotated at the peripheral speed that is the same as the steel sheet running speed (when the steel sheet was 1000 mm/s, the roll peripheral speed was 1000 mm/s; the peripheral speed of the rolls 4 was a relative speed 2.0 times the running speed of the metal sheet 1 ).

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  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
US18/580,482 2021-07-30 2022-05-26 Quenching apparatus, method for quenching, method for manufacturing cold rolled steel sheet, and method for manufacturing coated steel sheet Pending US20240318272A1 (en)

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JPS5937335B2 (ja) * 1979-06-28 1984-09-08 日本鋼管株式会社 連続焼鈍における鋼帯冷却装置
JPS5842254B2 (ja) * 1979-06-29 1983-09-19 日本鋼管株式会社 連続焼鈍設備
JPS5794528A (en) * 1980-12-04 1982-06-12 Nippon Kokan Kk <Nkk> Continous annealing facility
JPS59153843A (ja) 1983-02-18 1984-09-01 Nippon Kokan Kk <Nkk> ストリップの冷却装置
JP3299076B2 (ja) * 1995-04-28 2002-07-08 川崎製鉄株式会社 鋼板の冷却方法および装置
JP5891857B2 (ja) 2012-03-06 2016-03-23 Ｊｆｅスチール株式会社 鋼帯の製造装置および鋼帯の製造方法
JP6308287B2 (ja) * 2015-12-28 2018-04-11 Ｊｆｅスチール株式会社 急冷焼入れ装置及び急冷焼入れ方法
WO2017115742A1 (ja) * 2015-12-28 2017-07-06 Ｊｆｅスチール株式会社 急冷焼入れ装置及び急冷焼入れ方法
JP6947328B2 (ja) * 2019-10-31 2021-10-13 Ｊｆｅスチール株式会社 鋼板、部材及びそれらの製造方法

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