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WO2016152018A1 - Appareil de galvanisation par immersion à chaud en continu et procédé de fabrication de tôle d'acier galvanisée par immersion à chaud - Google Patents

Appareil de galvanisation par immersion à chaud en continu et procédé de fabrication de tôle d'acier galvanisée par immersion à chaud Download PDF

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Publication number
WO2016152018A1
WO2016152018A1 PCT/JP2016/000899 JP2016000899W WO2016152018A1 WO 2016152018 A1 WO2016152018 A1 WO 2016152018A1 JP 2016000899 W JP2016000899 W JP 2016000899W WO 2016152018 A1 WO2016152018 A1 WO 2016152018A1
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Prior art keywords
gas
pipe
zone
soaking zone
dry gas
Prior art date
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Ceased
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PCT/JP2016/000899
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English (en)
Japanese (ja)
Inventor
玄太郎 武田
三宅　勝
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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
Priority to KR1020177025773A priority Critical patent/KR102026708B1/ko
Priority to MX2017012192A priority patent/MX373025B/es
Priority to CN201680017349.3A priority patent/CN107429374B/zh
Priority to EP16767930.7A priority patent/EP3276037B1/fr
Publication of WO2016152018A1 publication Critical patent/WO2016152018A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere
    • 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
    • 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
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C23C2/004—Snouts
    • 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
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
    • 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
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0224—Two or more thermal pretreatments
    • 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
    • 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
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • 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
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C18/00—Alloys based on zinc
    • C22C18/04—Alloys based on zinc with aluminium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium

Definitions

  • the present invention relates to a continuous galvanizing apparatus having an annealing furnace in which a heating zone, a soaking zone and a cooling zone are juxtaposed in this order, and a hot dip galvanizing equipment adjacent to the cooling zone, and a hot dip galvanizing using the same.
  • the present invention relates to a method of manufacturing a steel plate.
  • high-tensile steel plates that contribute to weight reduction of structures.
  • a high-tensile steel material for example, it has been found that a steel plate with good hole expansibility by containing Si in the steel, and a steel plate with good ductility can be produced by easily containing residual ⁇ by containing Si or Al. Yes.
  • An alloyed hot-dip galvanized steel sheet is obtained by heat-annealing a base steel sheet in a reducing or non-oxidizing atmosphere at a temperature of about 600 to 900 ° C., then subjecting the steel sheet to hot-dip galvanizing treatment, and further heating the galvanizing Manufactured by alloying.
  • Si in the steel is an easily oxidizable element and is selectively oxidized even in a generally used reducing atmosphere or non-oxidizing atmosphere to concentrate on the surface of the steel sheet to form an oxide.
  • This oxide reduces wettability with molten zinc during the plating process and causes non-plating. Therefore, as the Si concentration in the steel increases, the wettability decreases sharply and non-plating occurs frequently. In addition, even when non-plating does not occur, there is a problem that the plating adhesion is poor. Further, when Si in the steel is selectively oxidized and concentrated on the surface of the steel sheet, there is a problem that a remarkable alloying delay occurs in the alloying process after hot dip galvanizing, and the productivity is remarkably hindered.
  • Patent Document 1 in the continuous annealing hot dipping method using an annealing furnace and a hot dipping bath having a heating zone first stage, a heating zone latter stage, a heat retention zone, and a cooling zone in order, the steel plate temperature
  • the heating or heat retention of the steel sheet in the region of at least 300 ° C. or more is indirect heating
  • the atmosphere in the furnace of each zone is 1 to 10% by volume of hydrogen
  • the balance is nitrogen and inevitable impurities.
  • the temperature reached by the steel sheet during heating is set to 550 ° C. or higher and 750 ° C.
  • the dew point is set to less than ⁇ 25 ° C.
  • the dew point after the heating zone and the retentive zone is set to ⁇ 30 ° C. or higher and 0 ° C. or lower.
  • a technique is described in which Si is internally oxidized by annealing under the condition that the dew point of the band is less than ⁇ 25 ° C., thereby suppressing the concentration of Si on the surface of the steel sheet.
  • a mixed gas of nitrogen and hydrogen is introduced after humidification into the latter stage of the heating zone and / or the tropical zone.
  • a humidified gas is introduced into the soaking zone as described in Patent Document 1.
  • the humidified gas is not input, and only the reducing or non-oxidizing dry gas is input into the soaking zone. Therefore, for example, when manufacturing a high-strength steel plate and a normal steel plate continuously, it is necessary to operate while switching between use / non-use of the humidified gas.
  • the inventors of the present invention have recognized the following problems that occur when operating while switching between use / nonuse of such humidified gas. That is, when the humidifying gas is not used, even if the humidifying system gas is simply stopped, water from the humidifying device diffuses in the piping of the humidifying system and condensation occurs, or excessively humidified gas is retained. To do. Then, when the humidification system is switched from non-use to use, the condensed water and excessively humidified gas in the pipe blows into the soaking zone, damages the hearth roll in the soaking zone, and picks up. The problem that a water droplet pattern is attached to a steel plate occurs. Due to this, non-plating may occur in the subsequent hot dip galvanizing process, and the plating appearance may be impaired.
  • the present invention suppresses generation of a soaking zone roll pickup that may be caused by dew condensation or the like in a humidified gas pipe, and can obtain a good plating appearance. And it aims at providing the manufacturing method of a hot-dip galvanized steel plate.
  • the present inventors have formed dew condensation in the humidifying gas pipe when the humidifying gas is not used (while the humidifying gas supply to the soaking zone is stopped) or excessively humidified.
  • the present inventors have intensively studied to prevent the generated gas from staying, and found that the object can be achieved by the following configuration, thereby completing the present invention.
  • the gist of the present invention is as follows.
  • a continuous hot dip galvanizing apparatus having an annealing furnace in which a heating zone, a soaking zone, and a cooling zone are juxtaposed in this order, and a hot dip galvanizing facility adjacent to the cooling zone,
  • a first pipe through which a reducing or non-oxidizing drying gas passes;
  • a gas distributor connected to the first pipe for distributing the dry gas that has passed through the first pipe;
  • a humidifier connected to the second pipe and into which the dry gas that has passed through the second pipe is introduced;
  • a fifth pipe extending from the humidifier and through which humidified gas humidified by the humidifier passes;
  • a gas mixing device that is connected to the third pipe and the fifth pipe and mixes the dry gas that has passed through the third pipe and the humidified gas that has passed through the fifth pipe to produce a mixed gas;
  • a sixth pipe
  • a method for producing a hot-dip galvanized steel sheet wherein water is drained from the other space and water is not circulated using the circulating thermostatic bath.
  • the continuous hot dip galvanizing apparatus and the method for producing a hot dip galvanized steel sheet of the present invention it is possible to suppress the occurrence of a soaking zone roll pickup that may be caused by condensation in the humidified gas pipe, and to provide a good plating appearance. It is possible to obtain.
  • FIG. 2 is a schematic diagram showing a mixed gas and dry gas supply system to the soaking zone 12 in FIG. 1.
  • FIG. 3 is an enlarged schematic diagram of a humidifier 50 and a drain device 80 in FIG. 2.
  • the configuration of a continuous hot dip galvanizing apparatus 100 includes an annealing furnace 20 in which a heating zone 10, a soaking zone 12, and cooling zones 14 and 16 are arranged in this order, and a hot dip galvanizing bath 22 as a hot dip galvanizing facility adjacent to the cooling zone 16. And a hot dip galvanizing bath 22 and an adjacent alloying equipment 24.
  • the heating zone 10 includes a first heating zone 10A (a heating zone upstream) and a second heating zone 10B (a heating zone downstream).
  • the cooling zone includes a first cooling zone 14 (quenching zone) and a second cooling zone 16 (cooling zone).
  • the tip of the snout 18 connected to the second cooling zone 16 is immersed in a hot dip galvanizing bath 22, and the annealing furnace 20 and the hot dip galvanizing bath 22 are connected.
  • Another embodiment of the present invention is a method for producing a hot dip galvanized steel sheet using the continuous hot dip galvanizing apparatus 100.
  • the steel strip P is introduced into the first heating zone 10A from the steel strip inlet at the bottom of the first heating zone 10A.
  • one or more hearth rolls are disposed at the upper and lower portions.
  • the steel strip P is conveyed a plurality of times in the vertical direction inside a predetermined strip of the annealing furnace 20 to form a plurality of passes.
  • FIG. 1 an example of 10 passes in the soaking zone 12, 2 passes in the first cooling zone 14, and 2 passes in the second cooling zone 16 is shown.
  • the number of passes is not limited to this, and it depends on the processing conditions. It can be set as appropriate.
  • the steel strip P is changed to a right angle without turning back, and the steel strip P is moved to the next strip.
  • the steel strip P can be transported in the annealing furnace 20 in the order of the heating zone 10, the soaking zone 12, and the cooling zones 14 and 16, and the steel strip P can be annealed.
  • adjacent bands communicate with each other via a communication portion that connects the upper parts or the lower parts of each band.
  • the first heating zone 10 ⁇ / b> A and the second heating zone 10 ⁇ / b> B communicate with each other via a throat (throttle portion) that connects the upper portions of the respective zones.
  • the second heating zone 10B and the soaking zone 12 communicate with each other via a throat that connects the lower portions of each zone.
  • the soaking zone 12 and the first cooling zone 14 communicate with each other via a throat connecting the lower portions of the respective zones.
  • the 1st cooling zone 14 and the 2nd cooling zone 16 are connected via the throat which connects the lower parts of each zone.
  • each throat may be set as appropriate, but it is preferable that the height of each throat is as low as possible from the viewpoint of increasing the independence of the atmosphere of each band.
  • the gas in the annealing furnace 20 flows from the downstream to the upstream of the furnace and is discharged from the steel strip inlet at the bottom of the first heating zone 10A.
  • the second heating zone 10B is a direct-fired heating furnace (DFF).
  • DFF direct-fired heating furnace
  • a well-known DFF can be used.
  • a plurality of burners are arranged in a distributed manner facing the steel strip P on the inner wall of the direct-fired heating furnace in the second heating zone 10B.
  • the plurality of burners are preferably divided into a plurality of groups, and the fuel ratio and the air ratio can be independently controlled for each group.
  • the combustion exhaust gas from the second heating zone 10B is supplied into the first heating zone 10A, and the steel strip P is preheated by the heat.
  • Combustion rate is a value obtained by dividing the amount of fuel gas actually introduced into the burner by the amount of fuel gas in the burner at the maximum combustion load. When the burner is burned at the maximum combustion load, the burning rate is 100%. The burner cannot obtain a stable combustion state when the combustion load becomes low. Therefore, it is preferable that the combustion rate is usually 30% or more.
  • the air ratio is a value obtained by dividing the amount of air introduced into the actual burner by the amount of air necessary for complete combustion of the fuel gas.
  • the heating burner of the second heating zone 10B is divided into four groups (# 1 to # 4), and the three groups (# 1 to # 3) on the upstream side in the steel plate moving direction are oxidation burners,
  • the final zone (# 4) is a reduction burner, and the air ratio of the oxidation burner and the reduction burner can be individually controlled.
  • the air ratio is preferably 0.95 or more and 1.5 or less.
  • the air ratio is preferably 0.5 or more and less than 0.95.
  • the temperature inside the second heating zone 10B is preferably set to 800 to 1200 ° C.
  • the steel strip P in the soaking zone 12, can be indirectly heated using a radiant tube (RT) (not shown) as a heating means.
  • RT radiant tube
  • the average temperature Tr (° C.) inside the soaking zone 12 is measured by inserting a thermocouple into the soaking zone, but is preferably 700 to 900 ° C.
  • the soaking zone 12 is supplied with reducing gas or non-oxidizing gas.
  • reducing gas a H 2 —N 2 mixed gas is usually used, for example, H 2 : 1 to 20% by volume, and the balance is composed of N 2 and inevitable impurities (dew point: about ⁇ 60 ° C.) Is mentioned.
  • non-oxidizing gas include a gas having a composition composed of N 2 and inevitable impurities (dew point: about ⁇ 60 ° C.).
  • the reducing gas or non-oxidizing gas supplied to the soaking zone 12 is in two forms: a mixed gas and a dry gas.
  • the “dry gas” is the reducing gas or non-oxidizing gas having a dew point of about ⁇ 60 ° C. to ⁇ 50 ° C., and is not humidified by a humidifier.
  • “mixed gas” is obtained by mixing a gas humidified by a humidifier and a gas not humidified by a humidifier at a predetermined mixing ratio so that the dew point is ⁇ 20 to 10 ° C. Is.
  • the supply system includes a first pipe 31, a second pipe 32, a third pipe 33, a fourth pipe 34, a fifth pipe 35, and a sixth pipe 36 from the upstream side, and further includes a gas distribution device 40 and a humidifier. 50, a gas mixing device 60, and a drainage device 80.
  • the first pipe 31 passes dry gas supplied from a gas supply source (not shown).
  • the gas distribution device 40 is connected to the first pipe 31, and the dry gas that has passed through the first pipe 31 is arbitrarily and variable in the following three systems: the second pipe 32, the third pipe 33, and the fourth pipe 34. Distribute with.
  • the second piping 32, the third piping 33, and the fourth piping 34 branch from the gas distribution device 40, and the dry gas distributed to the gas distribution device 40 passes therethrough. That is, a part of the dry gas that has passed through the first pipe 31 is sent to the humidifier 50 through the second pipe 32, and the other part is sent to the gas mixer 60 through the third pipe. The remainder is supplied into the soaking zone 12 through the fourth pipe 34 as it is.
  • the gas distribution device 40 blocks distribution to the second pipe 32 and the third pipe 33 when the mixed gas described later is not used.
  • the dry gas that has passed through the fourth pipe 34 is supplied into the soaking zone 12 via the drying gas supply ports 72A, 72B, 72C, 72D provided in the soaking zone 12.
  • the position and number of the drying gas supply ports are not particularly limited, and may be appropriately determined in consideration of various conditions. However, it is preferable that a plurality of the drying gas supply ports be arranged at the same height position, and it is preferable that the drying gas supply ports are arranged uniformly in the steel strip traveling direction.
  • the humidifier 50 is connected to the second pipe 32 and the dry gas that has passed through the second pipe 32 is introduced.
  • the fifth pipe 35 extends from the humidifier 50, and the humidified gas humidified by the humidifier 50 passes therethrough.
  • the gas mixing device 60 is connected to the third pipe 33 and the fifth pipe 35, and mixes the dry gas that has passed through the third pipe and the humidified gas that has passed through the fifth pipe at a predetermined and variable ratio to obtain a desired value.
  • the sixth pipe 36 is a mixed gas pipe, which extends from the gas mixing device 60 and through which the mixed gas discharged from the gas mixing device 60 passes.
  • the mixed gas that has passed through the sixth pipe 36 is supplied into the soaking tropics 12 through a mixed gas supply port provided in the soaking tropics 12.
  • the mixed gas is supplied by two systems of mixed gas supply ports 70A, 70B, and 70C and mixed gas supply ports 71A, 71B, and 71C.
  • the position and number of the mixed gas supply ports are not particularly limited, and may be appropriately determined in consideration of various conditions. However, a plurality of mixed gas supply ports are preferably arranged at two or more different height positions as in the present embodiment, and are preferably arranged evenly in the steel strip traveling direction.
  • the dew point of the mixed gas can be measured by a mixed gas dew point meter 74 provided in the sixth pipe.
  • the humidifier 50 has a cylindrical module 52 and a circulating constant temperature water tank 54.
  • a water vapor permeable membrane 51 is disposed in the module 52.
  • the water vapor permeable membrane 51 is a fluorine-based or polyimide-based hollow fiber membrane. Although only two are shown in FIG. 3, about 50 to 500 hollow fiber membranes are arranged substantially in parallel.
  • a fluorine-based or polyimide-based hollow fiber membrane is a kind of ion exchange membrane having an affinity for water molecules.
  • a difference in moisture concentration occurs between the inside and outside of the hollow fiber membrane, a force is generated to make the concentration difference uniform, and the moisture permeates through the membrane toward a lower moisture concentration using the force as a driving force. Therefore, the dry gas is humidified in the process of passing through the inner side 53 ⁇ / b> A of the water vapor permeable membrane in the module 52 and becomes a humidified gas.
  • the dry gas temperature changes according to the season and daily temperature change, but in this embodiment, heat exchange can also be performed by taking a sufficient contact area between the gas and water through the water vapor permeable membrane 51.
  • the dry gas is humidified to the same dew point as the set water temperature, and highly accurate dew point control is possible.
  • the dew point of the humidified gas can be arbitrarily controlled in the range of 5 to 50 ° C. If the dew point of the humidified gas is higher than the piping temperature, condensation may occur in the piping, and the condensed water may directly enter the furnace.Therefore, the humidifying gas piping should be above the humidifying gas dew point and above the ambient temperature. It is heated and insulated.
  • the water vapor permeable membrane may be a fluorine-based or polyimide-based flat membrane.
  • the dry gas that has passed through the second pipe 32 passes through one space that separates the water vapor permeable membrane in the module, and water is circulated in the other space using the circulating thermostatic water tank 54. Humidify the dry gas.
  • the continuous hot dip galvanizing apparatus 100 of this embodiment is characterized in that it has a drainage device 80 for draining water from the space 53B outside the water vapor permeable membrane of the module when the mixed gas is not supplied in the soaking zone.
  • An example of the drainage device 80 is shown in FIG.
  • the drainage device 80 includes a first cutoff valve 82, a second flow path 84, a second cutoff valve 86, and a drainage tank 88.
  • the 1st cutoff valve 82 is provided in the flow path 55B through which the water which moves to the circulation thermostatic water tank 54 from the outer side 53B of the water-vapor-permeable membrane in a module passes.
  • the second flow path 84 branches from a portion upstream of the first shutoff valve 82 of the flow path 55B (near the outer side 53B of the water vapor permeable membrane), and the tip is located above the drainage tank 88.
  • the second shutoff valve 86 is provided in the second flow path 84.
  • the drainage tank 88 stores the water discharged from the second flow path 82.
  • the first shut-off valve 82 When generating humidified gas, the first shut-off valve 82 is fully opened, the second shut-off valve 86 is fully closed, and water is circulated to the outer side 53B of the water vapor permeable membrane in the module using the constant temperature circulating water tank 54.
  • the second shut-off valve 86 When the humidified gas is not generated, water circulation is stopped, the second shut-off valve 86 is fully opened, and the first shut-off valve 82 is fully closed, so that the water in the space 53B outside the water vapor permeable membrane of the module is drained. Drained into tank 88.
  • the height of the module 52 cannot be increased by 200 mm or more with respect to the upper end of the drainage tank 88, it is preferable to provide a suction device or the like on the drainage tank side to drain the water in the humidifier.
  • a mixed gas containing a humidified gas is supplied to the soaking zone 12 in addition to the dry gas.
  • this state is referred to as a “first operation state”.
  • this state is referred to as a “second operation state”.
  • the distribution of the dry gas to the second pipe 32 and the humidifier 50 is stopped so that the dry gas does not flow to the inner side 53A of the water vapor permeable membrane in the module. You can do it.
  • the pipes before and after the module 52 (the second pipe 32 and the fifth pipe 35) and the sixth pipe 36 further downstream are arranged. Condensation will occur. Even if the pipe is heated and kept warm, since the moisture is always saturated in the pipe, excessively humidified gas stays there. Even if the circulation of water is stopped, the same problem occurs even if the space of the outer side 53B of the module's water vapor permeable membrane is filled with water and left for a long time.
  • switching between the first operation state / second operation state is performed as follows. First, in the first operation state, with the first shut-off valve 82 fully opened and the second shut-off valve 86 fully closed, water is circulated using the circulating thermostatic bath 54 to generate humidified gas. In the second operation state, the distribution of the dry gas to the second pipe 32 is stopped, and further, the circulation of water using the circulating constant temperature water tank 54 is stopped, and then the water vapor permeable membrane of the module is discharged using the discharge device 80. Water is drained from the space of the outer side 53B. Specifically, the second cutoff valve 86 is fully opened and the first cutoff valve 82 is fully closed. That is, in the second operation state, there is no water in the outer space 53B of the water vapor permeable membrane, and water is not circulated using the circulation thermostatic water tank 54. The temperature adjustment of the circulating constant temperature water tank 54 may be continued.
  • the second pipe Restart the distribution of dry gas to 32.
  • the gas flow rate Qrd of the dry gas supplied to the soaking zone 12 through the fourth pipe 34 is determined by a gas flow meter (not shown) provided in the fourth pipe 34. Although it is measured and is not particularly limited, it is set to about 0 to 600 (Nm 3 / hr). As a result, the furnace pressure in the soaking zone 12 is maintained appropriately (higher than the direct fire zone), and an excessive amount does not become the furnace pressure.
  • the gas flow rate Qrw of the mixed gas supplied to the soaking zone 12 through the sixth pipe 36 is measured by a gas flow meter (not shown) provided in the sixth pipe 36 and is particularly limited. Although not, it is set to about 100 to 500 (Nm 3 / hr). As a result, the furnace pressure in the soaking zone 12 is appropriately maintained (higher than the direct flame zone), and the furnace pressure does not become excessive.
  • the dew point in the soaking zone 12 In the first operating state, it is preferable to always control the dew point in the soaking zone 12 to -20 ° C or higher and 0 ° C or lower. At least one dew point meter (dew point measurement position 75A) in the vicinity of the lower hearth roll 73B (the lowest part of the soaking tropics) and a position below the upper hearth roll 73A and higher than 1/2 of the soaking zone height direction ( At least one place (dew point measurement position 75B) is installed in the upper part of the soaking zone.
  • the dew point in the soaking zone 12 is controlled to -20 ° C. or higher, an appropriate alloying temperature is obtained during the subsequent alloying treatment, and desired mechanical properties can be obtained.
  • the upper limit of the dew point is because the uniformity of the dew point distribution in the soaking zone 12 and the dew point fluctuation range are minimized. It is preferable to manage at 0 ° C.
  • a mixed gas having an arbitrary dew point can be supplied into the soaking zone 12. If the dew point in the soaking zone 12 is below the target range, supply a mixed gas with a high dew point. If the dew point in the soaking zone 12 is above the target range, supply a mixed gas with a low dew point. Can do. In this way, in the first operating state, the dew point in the soaking zone 12 can always be controlled to -20 ° C or higher and 0 ° C or lower.
  • the steel strip P is cooled in the cooling zones 14 and 16.
  • the steel strip P is cooled to about 480 to 530 ° C. in the first cooling zone 14 and is cooled to about 470 to 500 ° C. in the second cooling zone 16.
  • the reducing gas or non-oxidizing gas is also supplied to the cooling zones 14 and 16, only the dry gas is supplied here.
  • the supply of the drying gas to the cooling zones 14 and 16 is not particularly limited, but it is preferable to supply the drying gas from two or more inlets in the height direction and two or more inlets in the longitudinal direction so as to be uniformly introduced into the cooling zone. .
  • the total gas flow rate Qcd of the dry gas supplied to the cooling zones 14 and 16 is measured by a gas flow meter (not shown) provided in the pipe and is not particularly limited, but is about 200 to 1000 (Nm 3 / hr). And As a result, the furnace pressure in the soaking zone 12 is maintained appropriately (higher than the direct fire zone), and an excessive amount does not become the furnace pressure.
  • Hot dip galvanization bath Using the hot dip galvanizing bath 22, hot dip galvanization can be performed on the steel strip P discharged from the second cooling zone 16. Hot dip galvanization may be performed according to a conventional method.
  • the galvanization applied to the steel strip P can be heated and alloyed.
  • the alloying process may be performed according to a conventional method. According to this embodiment, since the alloying temperature does not become high, the tensile strength of the manufactured alloyed hot-dip galvanized steel sheet does not decrease.
  • the alloying equipment 24 and the alloying treatment using it are not essential. This is because the effect of suppressing the generation of a soaking zone roll pickup that may be caused by dew condensation on the humidified gas pipe and obtaining a good plating appearance can be obtained even when the alloying treatment is not performed. .
  • the second heating zone was DFF.
  • the heating burner is divided into four groups (# 1 to # 4).
  • the three groups (# 1 to # 3) on the upstream side in the direction of moving the steel plate are oxidation burners, and the final zone (# 4) is a reduction burner.
  • the air ratio of the oxidation burner and the reduction burner was set to the values shown in Table 2.
  • the length of the steel plate conveyance direction of each group is 4 m.
  • the soaking zone was an RT furnace with a volume Vr of 700 m 3 .
  • the average temperature Tr in the soaking zone was set as shown in Table 2.
  • a gas (dew point: ⁇ 50 ° C.) having a composition composed of 15% by volume of H 2 and the balance of N 2 and inevitable impurities was used as the drying gas.
  • a part of this dry gas was humidified by a humidifier having 10 hollow fiber membrane humidification modules to prepare a mixed gas.
  • Each module was supplied with a maximum of 500 L / min of dry gas and a maximum of 10 L / min of circulating water.
  • a circulating water bath is common to each module and can supply a total of 100 L / min of pure water.
  • the dry gas supply port and the mixed gas supply port were arranged at the positions shown in FIG. Moreover, the drainage apparatus shown in FIG. 3 was also installed.
  • the gas was supplied in the soaking zone with the second operation state during the passing of the steel type A and the first operation state during the passing of the steel type B.
  • the dry gas flow rate Qrd, the mixed gas flow rate Qrw, and the mixed gas dew point in Table 2 are stable values in the respective plates.
  • the dry gas (dew point: ⁇ 50 ° C.) was supplied at the flow rate shown in Table 2 from the bottom of each zone.
  • the plating bath temperature was 460 ° C.
  • the Al concentration in the plating bath was 0.130%
  • the adhesion amount was adjusted to 45 g / m 2 per side by gas wiping.
  • the line speed was 80-100 mpm.
  • alloying treatment was performed in an induction heating type alloying furnace so that the degree of film alloying (Fe content) was within 10 to 13%.
  • the alloying temperature at that time is shown in Table 2.
  • the continuous hot dip galvanizing apparatus and the method for producing a hot dip galvanized steel sheet of the present invention it is possible to suppress the occurrence of a soaking zone roll pickup that may be caused by condensation in the humidified gas pipe, and to provide a good plating appearance. It is possible to obtain.

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Abstract

La présente invention concerne un appareil de galvanisation par immersion à chaud en continu qui permet d'éviter la survenue d'un ramassage par le rouleau dans une zone de trempage en raison de la condensation dans une tuyauterie pour un gaz humidifié et qui permet d'atteindre un bon aspect pour une surface plaquée. L'appareil de galvanisation par immersion à chaud en continu selon la présente invention comprend : un four de recuit dans lequel une zone de chauffage, une zone de trempage et une zone de refroidissement sont situées côte à côte dans cet ordre ; et un système de galvanisation par immersion à chaud adjacent à la zone de refroidissement. Les gaz fournis à la zone de trempage (12) sont : un mélange de gaz obtenu par mélange d'un gaz humidifié par un dispositif humidificateur (50) et d'un gaz qui n'est pas humidifié par le dispositif humidificateur (50) ; et un gaz sec qui n'est pas humidifié par le dispositif humidificateur. Cet appareil de galvanisation par immersion à chaud en continu comprend un dispositif de purge (80) pour la purge de l'eau en circulation provenant du dispositif humidificateur (50) lorsque le mélange de gaz n'est pas fourni à la zone de trempage (12).
PCT/JP2016/000899 2015-03-23 2016-02-19 Appareil de galvanisation par immersion à chaud en continu et procédé de fabrication de tôle d'acier galvanisée par immersion à chaud Ceased WO2016152018A1 (fr)

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KR1020177025773A KR102026708B1 (ko) 2015-03-23 2016-02-19 연속 용융 아연 도금 장치 및 용융 아연 도금 강판의 제조 방법
MX2017012192A MX373025B (es) 2015-03-23 2016-02-19 Aparato de galvanizacion por inmersion en caliente continua y metodo de produccion de lamina de acero galvanizada por inmersion en caliente.
CN201680017349.3A CN107429374B (zh) 2015-03-23 2016-02-19 连续热浸镀锌装置和热浸镀锌钢板的制造方法
EP16767930.7A EP3276037B1 (fr) 2015-03-23 2016-02-19 Procédé de fabrication de tôle d'acier galvanisée par immersion à chaud

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EP3617339A4 (fr) * 2017-04-27 2020-04-08 JFE Steel Corporation Procédé de production de tôle d'acier recuite après galvanisation et appareil de galvanisation en continu par immersion à chaud
CN111304424A (zh) * 2020-04-27 2020-06-19 唐山曹妃甸区首燕机械有限公司 一种炉鼻子加湿器
CN111321364A (zh) * 2020-03-31 2020-06-23 无锡聚永丰环保科技有限公司 一种镀锌钢丝高效镀锌装置
EP3502300B1 (fr) 2016-10-25 2021-01-13 JFE Steel Corporation Procédé de production d'une tôle d'acier de haute résistance galvanisée à chaud

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JP6822934B2 (ja) * 2017-10-26 2021-01-27 株式会社神戸製鋼所 溶融亜鉛めっき鋼板の製造方法
CN109722516B (zh) * 2019-02-01 2020-07-17 北京钢研新冶工程设计有限公司 一种快速调控退火炉内气体露点的装置及方法
CN112481484B (zh) * 2020-11-10 2022-04-01 马鞍山钢铁股份有限公司 一种不同合金成分热镀锌产品的露点自适应控制方法
US20240229186A1 (en) * 2021-05-06 2024-07-11 Jfe Steel Corporation Dew point control method for continuous annealing furnace, continuous annealing method for steel sheet, steel sheet manufacturing method, continuous annealing furnace, continuous hot-dip galvanizing line, and galvannealing line
CN115287567A (zh) * 2022-08-04 2022-11-04 江阴市华达机械科技有限公司 一种炉鼻子加湿系统

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CN111304424A (zh) * 2020-04-27 2020-06-19 唐山曹妃甸区首燕机械有限公司 一种炉鼻子加湿器

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EP3276037A1 (fr) 2018-01-31
MX373025B (es) 2020-05-27
JP6008007B2 (ja) 2016-10-19
CN107429374B (zh) 2020-01-14
CN107429374A (zh) 2017-12-01
KR102026708B1 (ko) 2019-09-30
MX2017012192A (es) 2017-12-15
EP3276037A4 (fr) 2018-03-21
EP3276037B1 (fr) 2021-04-07
KR20170117522A (ko) 2017-10-23

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