WO2014132638A1 - Procédé permettant de fabriquer une tôle d'acier galvanisée par immersion à chaud et dispositif de galvanisation par immersion à chaud en continu - Google Patents

Procédé permettant de fabriquer une tôle d'acier galvanisée par immersion à chaud et dispositif de galvanisation par immersion à chaud en continu Download PDF

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Publication number
WO2014132638A1
WO2014132638A1 PCT/JP2014/001022 JP2014001022W WO2014132638A1 WO 2014132638 A1 WO2014132638 A1 WO 2014132638A1 JP 2014001022 W JP2014001022 W JP 2014001022W WO 2014132638 A1 WO2014132638 A1 WO 2014132638A1
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WIPO (PCT)
Prior art keywords
burner
steel sheet
hot dip
air
dip galvanized
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PCT/JP2014/001022
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English (en)
Japanese (ja)
Inventor
玄太郎 武田
高橋　秀行
田中　稔
鈴木　克一
Original Assignee
Ｊｆｅスチール株式会社
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Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to CN201480011496.0A priority Critical patent/CN105026598B/zh
Priority to MX2015011184A priority patent/MX2015011184A/es
Priority to KR1020157026871A priority patent/KR101722350B1/ko
Publication of WO2014132638A1 publication Critical patent/WO2014132638A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D91/00—Burners specially adapted for specific applications, not otherwise provided for
    • F23D91/02—Burners specially adapted for specific applications, not otherwise provided for for use in particular heating operations
    • 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
    • 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
    • C21D9/562—Details
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/68—Treating the combustion air or gas, e.g. by filtering, or moistening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D23/00—Assemblies of two or more burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/26—Measuring humidity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to a method for producing a hot-dip galvanized steel sheet having a direct-fired heating furnace in an annealing furnace and a continuous hot-dip galvanizing apparatus.
  • high-tensile steel sheets high-tensile steel materials
  • high-tensile steel materials for example, steel sheets with good hole expansibility by containing Si in the steel, and steel sheets with good ductility can easily be formed by containing Si and Al, and residual ⁇ is easily formed. I know.
  • the hot dip galvanized steel sheet is subjected to a hot dip galvanizing treatment after heat annealing at a temperature of about 600 to 900 ° C. in a non-oxidizing atmosphere or a reducing atmosphere.
  • Si in steel is an easily oxidizable element, and is selectively oxidized in a generally used non-oxidizing atmosphere or reducing atmosphere to concentrate on the surface to form an oxide. This oxide lowers the wettability with molten zinc during the plating process and causes non-plating.
  • the wettability rapidly decreases as the Si concentration in the steel increases, 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, a significant alloying delay occurs in the alloying process after hot dip galvanizing. As a result, productivity is significantly inhibited. If an alloying treatment is attempted at an excessively high temperature in order to ensure productivity, there is a problem that the powdering resistance is deteriorated, and it is difficult to achieve both high productivity and good powdering resistance.
  • Patent Documents 1 and 2 disclose that a steel sheet surface is once oxidized using a direct-fired heating furnace (DFF) or a non-oxidizing furnace (NOF) and then reduced in a reduction zone.
  • DFF direct-fired heating furnace
  • NOF non-oxidizing furnace
  • the outlet temperature of the direct flame furnace is about 700 ° C. (at least 650 ° C. or higher). It has become.
  • the line speed can be increased to a maximum of 100 m / min (mpm) in the case of a 1.6 mm steel plate, whereas it is about 62.5 to 75 m / min in a Si-added steel.
  • the line speed will remain and productivity will be significantly reduced.
  • the method described in Patent Document 2 shows an optimum atmosphere-containing water vapor partial pressure and the like.
  • the water content in the atmosphere after combustion in the heating furnace is 1 to 50% in a preferable range.
  • the reason for the limitation is not clear and the control method is not shown.
  • the dew point of the input air fluctuates in a normal air atmosphere with a dew point of ⁇ 10 ° C. to 30 ° C. (water content of 0.257 to 4.53%)
  • the water content in the furnace after coke gas combustion is 20 to 20 ° C. It is about 24%.
  • the moisture content of the input gas changes depending on the temperature and weather, and the amount of Fe oxidation changes. Therefore, it is difficult to control the amount of Fe oxidation, and the optimum direct-fired heating furnace outlet temperature changes every moment. Is the actual situation.
  • the present invention can provide a hot-dip galvanized steel sheet that is excellent in plating appearance even with Si-added steel, and provides a high-productivity hot-dip galvanized steel sheet manufacturing method and continuous hot-dip galvanizing apparatus. For the purpose.
  • the gist of the present invention for solving the above problems is as follows.
  • [1] When producing a hot dip galvanized steel sheet using a continuous hot dip galvanizing apparatus equipped with a direct-fired heating furnace having a burner opposed to the steel sheet surface, adjusting the dew point of the gas introduced into the burner A method for producing a hot-dip galvanized steel sheet.
  • [2] A method for manufacturing a hot-dip galvanized steel sheet according to [1], wherein the dew point of the input gas is 40 ° C. to 80 ° C.
  • the gases to be input are fuel gas and air, and the dew point of the air is adjusted. Manufacturing method.
  • the steel sheet is moved by using a plurality of burner groups capable of independently controlling the combustion rate and the air ratio in the longitudinal direction of the steel sheet.
  • Burner group other than the burner group at the downstream end in the direction is burned at a fuel gas and / or air dew point of 40 to 80 ° C. and combustion is performed at an air ratio of 1.0 to 1.5.
  • a continuous hot dip galvanizing apparatus provided with a direct-fired heating furnace in which a plurality of burners are arranged opposite to the steel plate surface
  • the burner can be controlled by a plurality of burn rates and air ratios independently controllable in the longitudinal direction of the steel plate
  • the burners in the burner group other than the burner group at the most downstream in the steel plate moving direction are equipped with a humidity control device for introducing air conditioned at a dew point in the range of 40 to 80 ° C, and the steel plate moving direction.
  • Burners other than the most downstream burner group can freely select combustion or combustion stop at an air ratio of 1.0 or more and less than 1.5.
  • a continuous hot dip galvanizing apparatus characterized by being capable of burning below 95.
  • a hot dip galvanized steel sheet is produced using a continuous hot dip galvanizing apparatus equipped with a direct-fired heating furnace in an annealing furnace, even a steel containing 0.1% or more of Si is beautiful.
  • a hot-dip galvanized steel sheet having a surface appearance can be stably produced without a decrease in productivity.
  • a hot-dip galvanized steel sheet can be manufactured very stably without being influenced by disturbances such as temperature and weather.
  • FIG. 1 shows an embodiment of a direct-fired heating furnace disposed in the continuous hot-dip galvanizing apparatus of the present invention
  • (a) is a longitudinal sectional view of the direct-fired heating furnace
  • (b) is a direct-fired heating.
  • It is a front view which shows the burner group of the direct-fired burner arranged in multiple numbers on the furnace wall surface.
  • FIG. 2 is a diagram showing the results of examining the relationship between the dew point of air (Air) supplied to the burner and the amount of H 2 O gas in the DFF.
  • FIG. 3 is a diagram showing the results of examining the relationship between the dew point of the air (Air) charged into the burner and the amount of Fe oxidation of the Si-added steel.
  • FIG. 4 is a diagram showing the flow of air (Air) and coke gas (COG) charged into the burner.
  • FIG. 5 is a schematic diagram showing the humidity control apparatus of the present invention.
  • FIG. 6 is a diagram showing the relationship between the travel distance of the steel plate, the plate temperature, and the oxidation amount, where (a) shows the results of the invention example (condition 3) and (b) shows the results of the comparative example (condition 7). is there.
  • FIG. 1 shows a main part of a direct-fired heating furnace arranged in an annealing furnace of a continuous galvanizing apparatus according to an embodiment of the present invention.
  • (a) is a longitudinal sectional view of a direct-fired heating furnace
  • (b) is a front view showing a plurality of burners of direct-fired burners arranged on the wall of the direct-fired heating furnace.
  • 1 is a direct-fired heating furnace
  • 2 is a burner (direct-fired burner)
  • 3 is a steel plate.
  • a radiant tube (RT) furnace, a cooling furnace, a hot dipping equipment, an alloying equipment, etc. are arranged downstream of the direct-fired heating furnace 1 (not shown).
  • the RT furnace, cooling furnace, hot dipping equipment, alloying equipment, etc. are not particularly limited and may be those usually employed.
  • a preheating furnace may be arranged upstream of the direct-fired heating furnace.
  • ⁇ A plurality of burners 2 are arranged facing the steel plate surface.
  • a plurality of burners 2 arranged facing the steel plate surface are divided into four burner groups (groups) 1Z to 4Z in the longitudinal direction of the steel plate.
  • the burner groups 1Z to 3Z can independently control the combustion rate and the air ratio for each burner group.
  • the burners in the burner groups 1Z to 3Z burn under the condition that the combustion rate is equal to or higher than a predetermined threshold.
  • the burner groups 1Z to 3Z are oxidation zones, and the burner group 4Z is a reduction zone.
  • 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.
  • the predetermined threshold value of the combustion rate is the ratio of the fuel gas amount at the lower limit of the combustion load that can ensure a stable combustion state with respect to the fuel gas amount at the maximum combustion load.
  • the threshold value of the combustion rate varies somewhat depending on the structure of the burner and can be easily determined by conducting a combustion test or the like. Usually, the threshold is about 30%.
  • By-product gas (coke gas) generated in a coke oven is often used as the fuel gas.
  • the composition of the coke gas is about H 2 : 50 to 60 vol%, CH 4 : 25 to 30 vol%, CO: 5 to 10 vol%, CO 2 : 2 to 4 vol%, N 2 : about 4 to 8 vol%.
  • the exhaust gas components after combustion at an air ratio of 1 are about H 2 O: 22 vol% and CO 2 : 8 vol%.
  • 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 air ratio When the air ratio is 1 or more, oxidation of the steel sheet surface is promoted by the presence of surplus oxygen that does not burn.
  • an oxide film is generated at the front stage of the direct-fired heating furnace (hereinafter also referred to as DFF) and reduced at the rear stage of the DFF, thereby suppressing the surface concentration of Si and plating. It becomes possible to improve wettability.
  • a gas component such as coke gas or air in the normal dew point range (about 0 to 25 ° C.)
  • a sufficient oxide film cannot be obtained unless the steel plate temperature at the DFF outlet is at least 650 ° C. or higher. Yes.
  • the inventors diligently studied a method capable of controlling the oxide film with a small heating load.
  • FIG. 2 is a diagram showing the relationship between the dew point of the air introduced into the burner (input Air dew point) and the amount of H 2 O gas in the DFF.
  • the amount of H 2 O gas in FIG. 2 is the amount of H 2 O gas (theoretical value) in the exhaust gas after burning the coke gas in Table 1 and humidified Air at an air ratio of 1.15.
  • FIG. 2 shows that the amount of H 2 O gas in the DFF increases by adjusting the dew point of the input air in advance. Therefore, by adjusting the dew point of the input gas, the amount of H 2 O gas in the DFF increases, and the oxidation of the steel sheet surface is promoted.
  • the amount of H 2 O gas in the DFF can be adjusted by adjusting the gas dew points of the combustion gas and air.
  • the amount of air required for complete combustion is usually 4 to 5 times the volume of coke gas volume 1.
  • the amount of H 2 O in the DFF can also be controlled by adjusting only the dew point of air having a large volume.
  • the dew point of the input gas is preferably 40 to 80 ° C.
  • the inventors have C: 0.12%, Si: 2.0%, Mn: 1.0%, Al: 0.03%, S: 0.005%.
  • P An off-line oxidation experiment was carried out by heating to 500 ° C. using a steel sheet having a component composition of 0.01% and the balance being Fe and inevitable impurities. The results are shown in FIG. From FIG. 3, it was found that when the dew point of the input air (Air) was 40 ° C. or more, the amount of Fe oxidation generated on the steel sheet surface was 200 mg / m 2 or more, which is the amount of oxidation necessary for galvanizing adhesion. .
  • the dew point of the input gas is preferably 40 to 80 ° C.
  • the burner groups 1Z to 3Z are equipped with a humidity control device that can appropriately adjust the humidity of the input air or combustion gas, and can be controlled to a desired dew point by the humidity control device.
  • the humidity control apparatus 4 may be installed, for example, before the air (Air) is input to the direct fire burner 2, and the Air that has passed through the humidity control apparatus is input to the direct fire burner. .
  • coke gas (COG) is thrown into a direct-fired burner from another line.
  • the humidity control device 4 may be provided before the COG is put into the direct fire burner 2.
  • the humidity control device is not particularly limited.
  • a hollow fiber membrane is a kind of ion exchange membrane having an affinity for water molecules.
  • 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.
  • a constant temperature water tank 6 is provided near the hollow fiber membrane filter 5, and pure water adjusted to a predetermined temperature is supplied from the constant temperature water tank 6 to the hollow fiber membrane filter 5. By doing so, the dew point of the input gas can be set to the same temperature as the water temperature.
  • the dew point of the introduced gas can be precisely controlled by supplying purge air instead of the pure water and adjusting the purge air flow rate or purge air pressure.
  • each burner group It is desirable to install one or more humidity control devices for each burner group so that they can be adjusted individually. It is desirable that the gas to be conditioned be heated to a predetermined dew point or higher before and after the humidity control device, or to keep the temperature from dropping from the humidity control device to the burner.
  • individually adjusting the tempering device it is possible to prevent dew condensation in the piping that may occur when the gas temperature is simply raised above a predetermined dew point. As a result, the tempering device can control the desired dew point.
  • Burner groups 1Z to 3Z can be freely selected for combustion or combustion stop for each burner group.
  • the combustion rate is set to a predetermined value or more and the air ratio is 1.0 or more and less than 1.5 (with surplus air).
  • Burners in the burner group 4Z can combust at an air ratio of 0.5 to 0.95, and the combustion rate can be controlled.
  • the burner group 4Z by burning the burner at an air ratio of 0.5 or more and 0.95 or less, the Fe oxide generated on the surface of the steel sheet can be reduced, and reduced Fe can be generated on the surface layer. Due to the presence of reduced Fe on the steel sheet surface layer when the steel sheet exiting the direct-fired heating furnace comes into contact with the roll in the RT furnace, the adhesion of oxide to the roll is prevented, resulting in the oxide adhesion To prevent defects (pickup).
  • O Fe oxidation amount [g / m 2 ]
  • P H2O Gas water vapor partial pressure after combustion (theoretical calculation from gas components)
  • Q Activation energy [kJ / mol] (each steel type) ):
  • T N Direct-fired heating furnace N group out-rolling steel plate temperature [K]
  • t N Direct-fired heating furnace N group staying time [s]
  • C Adjustment coefficient (varies depending on air ratio setting) .
  • a DFF direct-fired heating furnace in an annealing furnace
  • a DFF direct-fired heating furnace in an annealing furnace
  • a DFF direct-fired heating furnace
  • One group (# 1 to # 3) is an oxidation zone
  • the final zone (# 4) is a reduction zone.
  • the oxidation zone has an air ratio, a combustion rate, and a dew point of the input air (hereinafter referred to as Air dew point).
  • Air dew point a dew point of the input air
  • the air to be introduced into the burners in the oxidation zone was branched into 4 systems per zone, and a hollow fiber membrane filter was installed in each system.
  • One thermostatic water tank was installed for each zone, and pure water whose temperature was adjusted was fed to four hollow fiber membrane filters.
  • Table 2 shows the component composition of the steel sheet used in the test.
  • the annealing temperature was 830 ° C.
  • 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.
  • alloying was performed at an alloying temperature of 530 ° C.
  • Evaluation of plating appearance is performed by inspection with an optical surface defect meter (detecting non-plating defects or peroxide defects of ⁇ 0.5 or more) and visual judgment of alloying unevenness. If there was any failure, it was marked as x.
  • the summer temperature was 30 ° C. and the winter temperature was 0 ° C.
  • FIG. 6 shows the calculation results of the invention example (condition 3) and the comparative example (condition 7) among the Fe oxidation amounts calculated based on the formula (1).
  • the activation energy for the target steel component was 22405 J / mol.
  • the adjustment coefficient C was 1.44.
  • the target range of the amount of Fe oxidation necessary for the galvanizing treatment is 200 to 600 mg / m 2 .
  • Conditions 1 to 4 which are examples of the present invention, a sufficient amount of Fe oxidation can be secured regardless of the season, plate thickness, and line speed by appropriately increasing the dew point of the input air (FIG. 5 (a)). The plating appearance was good and the productivity could be maintained without lowering ST.
  • the required Fe oxidation amount can be ensured at a line speed of 120 mpm (conditions 5 and 9) because the DFF outlet temperature is as high as 755 ° C.
  • the average temperature on the DFF exit side was low, so that non-plating occurred and the appearance was x.
  • the line speed of 120 mpm even in the summer (condition 11) and winter (condition 7), the same average DFF outlet side temperature, the oxidation is insufficient in the winter and the plating appearance Became x.
  • the plating appearance was x when the line speed was 160 mpm (conditions 8 and 12). Therefore, when a steel plate having a thickness of 1.8 mm is manufactured, the production efficiency is remarkably lowered because the speed must be reduced in order to secure the necessary amount of oxidation.

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  • Mechanical Engineering (AREA)
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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
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Abstract

La présente invention a pour objet de fournir un procédé permettant de fabriquer des tôles d'acier galvanisées par immersion à chaud et un dispositif de galvanisation par immersion à chaud en continu ayant une productivité élevée avec lequel des tôles d'acier galvanisées par immersion à chaud ayant une excellente apparence de placage peuvent être obtenues même avec de l'acier qui contient du silicium (Si). La présente invention porte sur un procédé permettant de fabriquer des tôles d'acier galvanisées par immersion à chaud pour lequel, lors de la fabrication d'une tôle d'acier galvanisée par immersion à chaud à l'aide d'un dispositif de galvanisation par immersion à chaud en continu qui comprend une zone de chauffage du type à feu direct dans laquelle des brûleurs sont disposés de sorte à faire face à la surface de la tôle d'acier, le point de rosée de l'entrée de gaz dans les brûleurs est ajusté.
PCT/JP2014/001022 2013-03-01 2014-02-26 Procédé permettant de fabriquer une tôle d'acier galvanisée par immersion à chaud et dispositif de galvanisation par immersion à chaud en continu WO2014132638A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201480011496.0A CN105026598B (zh) 2013-03-01 2014-02-26 熔融镀锌钢板的制造方法及连续熔融镀锌装置
MX2015011184A MX2015011184A (es) 2013-03-01 2014-02-26 Metodo para la produccion de una lamina de acero galvanizada y aparato de galvanizacion continua.
KR1020157026871A KR101722350B1 (ko) 2013-03-01 2014-02-26 용융 아연도금 강판의 제조 방법 및 연속 용융 아연도금 장치

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013-040207 2013-03-01
JP2013040207A JP5915569B2 (ja) 2013-03-01 2013-03-01 溶融亜鉛めっき鋼板の製造方法および連続溶融亜鉛めっき装置

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WO2014132638A1 true WO2014132638A1 (fr) 2014-09-04

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JP (1) JP5915569B2 (fr)
KR (1) KR101722350B1 (fr)
CN (1) CN105026598B (fr)
MX (1) MX2015011184A (fr)
WO (1) WO2014132638A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3159420A4 (fr) * 2014-09-08 2017-07-26 JFE Steel Corporation Procédé et appareil de fabrication de tôle d'acier haute résistance galvanisée à chaud au trempé
KR20170117522A (ko) * 2015-03-23 2017-10-23 제이에프이 스틸 가부시키가이샤 연속 용융 아연 도금 장치 및 용융 아연 도금 강판의 제조 방법
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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EP3159420A4 (fr) * 2014-09-08 2017-07-26 JFE Steel Corporation Procédé et appareil de fabrication de tôle d'acier haute résistance galvanisée à chaud au trempé
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KR20170117522A (ko) * 2015-03-23 2017-10-23 제이에프이 스틸 가부시키가이샤 연속 용융 아연 도금 장치 및 용융 아연 도금 강판의 제조 방법
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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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KR20150121212A (ko) 2015-10-28
CN105026598A (zh) 2015-11-04
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