WO2022234701A1 - 連続焼鈍炉の露点制御方法、鋼板の連続焼鈍方法、鋼板の製造方法、連続焼鈍炉、連続溶融亜鉛めっき設備及び合金化溶融亜鉛めっき設備 - Google Patents
連続焼鈍炉の露点制御方法、鋼板の連続焼鈍方法、鋼板の製造方法、連続焼鈍炉、連続溶融亜鉛めっき設備及び合金化溶融亜鉛めっき設備 Download PDFInfo
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- continuous annealing
- dew point
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- 238000000137 annealing Methods 0.000 title claims abstract description 99
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 75
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Images
Classifications
-
- 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
- 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
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/005—Furnaces in which the charge is moving up or down
-
- 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
- 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
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- 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
-
- 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 disclosure relates to a continuous annealing furnace dew point control method, a steel sheet continuous annealing method, a steel sheet manufacturing method, a continuous annealing furnace, a continuous hot dip galvanizing equipment, and an alloying hot dip galvanizing equipment.
- high-strength steel sheets which contributes to the weight reduction of structures
- fields such as automobiles, home appliances, and building materials.
- high-tensile steel sheets for example, steel sheets with improved hole expandability by containing Si in the steel, steel sheets with good ductility due to easy formation of residual ⁇ by containing Si and Al in the steel, etc. are known. ing.
- Hot-dip galvanized steel sheets and alloyed hot-dip galvanized steel sheets are hot-annealed at a temperature of about 600 to 900° C. in a non-oxidizing atmosphere or a reducing atmosphere, and then hot-dip galvanized.
- Si in steel is an easily oxidizable element, and is selectively oxidized even in a generally used non-oxidizing atmosphere or reducing atmosphere, and concentrates on the surface to form an oxide.
- this oxide reduces the wettability with molten zinc during plating and causes non-plating, the wettability decreases as the Si concentration in the steel increases, resulting in frequent non-plating. Moreover, even if non-plating occurs, the problem of poor plating adhesion may occur. Furthermore, when Si in steel is selectively oxidized and concentrated on the surface, alloying delay may occur in the alloying process after hot-dip galvanizing. As a result, productivity may decrease. If the alloying treatment is performed at an excessively high temperature in order to ensure productivity, deterioration of the powdering resistance may be caused. Therefore, it is difficult to achieve both high productivity and good powdering resistance.
- Hydrogen embrittlement cracking is a phenomenon in which a steel member, which is subjected to high stress during use, suddenly breaks due to hydrogen entering the steel from the environment. This fracture phenomenon is also called delayed fracture because of its mode of occurrence.
- hydrogen embrittlement cracking of steel sheets is more likely to occur as the tensile strength of steel sheets increases. This is probably because the higher the tensile strength of the steel sheet, the greater the stress remaining in the steel sheet after the parts are formed.
- Patent Document 1 discloses a method of manufacturing a galvanized steel sheet by passing a cold-rolled steel sheet with a predetermined chemical composition through an annealing furnace twice and then subjecting the steel sheet to continuous hot-dip plating. .
- the technique of Patent Document 1 in the second heat treatment (annealing), sets the furnace atmosphere to a H concentration of 2 to 5% and a water vapor partial pressure of -1. Adjust so that 1 ⁇ log(PH 2 O/PH 2 ) ⁇ 0.07 is satisfied, that is, approximately ⁇ 17 to +30° C. in terms of dew point.
- Patent Document 2 discloses a method in which a part of the gas in the furnace is taken out, dehumidified using a refiner to raise the gas temperature to 400 to 600 ° C., and then supplied into the furnace.
- Patent Document 3 discloses a method of reducing the dew point of at least the uppermost part of the furnace to 0° C. or less by discharging atmospheric gas from the vicinity of the hearth rolls and supplying dry gas to the vicinity of the hearth rolls.
- the purpose of the present disclosure which has been made in view of such circumstances, is to provide a dew point control method for a continuous annealing furnace that can control the dew point in the furnace in a short time, a method for continuously annealing a steel plate, a method for manufacturing a steel plate, a continuous annealing furnace, and a continuous hot dip galvanizing equipment. and to provide an alloyed hot-dip galvanizing equipment.
- a dew point control method for a continuous annealing furnace includes: In a continuous annealing furnace, supply of moist gas into the furnace is stopped or reduced, and dry gas is supplied along the inner wall of the continuous annealing furnace.
- the furnace inner wall of the continuous annealing furnace may be set to a temperature higher than the atmosphere temperature in the furnace by 30°C or more. Further, in the dew point control method for the continuous annealing furnace, the dew point in the furnace may be changed from a dew point of 5°C or higher to a dew point of less than 0°C.
- the angle formed by the drying gas injected from the inside of the furnace to the inner wall of the furnace in the continuous annealing furnace and the inner wall of the furnace is 5 ° or more and 45 ° or less, and the drying The impingement wind speed of the gas against the inner wall of the furnace may be controlled to be 0.8 m/s or more.
- a continuous annealing method for a steel sheet according to an embodiment of the present disclosure includes: The in-furnace dew point is controlled using the dew point control method for the continuous annealing furnace described above.
- a steel sheet manufacturing method includes: A high-strength steel sheet, a hot-dip galvanized steel sheet, or an alloyed hot-dip galvanized steel sheet is manufactured using the above-described continuous annealing method for steel sheets.
- a continuous annealing furnace includes: A nozzle capable of supplying gas along the inner wall of the furnace is provided, and the gas supplied from the nozzle includes dry gas.
- the continuous annealing furnace is provided with a nozzle for injecting gas into at least one of the furnace top wall and the furnace side wall in the furnace, and the angle formed by the gas injected from the nozzle to the furnace inner wall and the furnace inner wall is 5. ° or more and 45° or less. Further, the continuous annealing furnace may be provided with a heating mechanism capable of heating the inner wall of the furnace to a temperature higher than the atmosphere temperature in the furnace by 30°C or more.
- a continuous hot dip galvanizing facility includes: The above continuous annealing furnace and a plating apparatus following the continuous annealing furnace are provided.
- An alloyed hot-dip galvanizing facility includes: It comprises the above continuous annealing furnace, and a plating apparatus and an alloying furnace following the continuous annealing furnace.
- a continuous annealing furnace dew point control method capable of controlling the dew point in the furnace in a short time, a steel sheet continuous annealing method, a steel sheet manufacturing method, a continuous annealing furnace, a continuous hot dip galvanizing equipment, and an alloying hot dip galvanizing equipment can be provided.
- FIG. 1 is a diagram showing one configuration example of a continuous hot-dip galvanizing facility including a continuous annealing furnace and a plating apparatus.
- FIG. 2 is a diagram showing an example of a furnace gas supply route in a reduction furnace.
- FIG. 3 is a diagram showing a conventional dry gas supply nozzle.
- FIG. 4 is a diagram showing an example of nozzles for supplying dry gas along the inner wall of the furnace in this embodiment.
- FIG. 5 is a diagram showing an example of a device for controlling heating of the inner wall surface of the reduction furnace.
- FIG. 6 is a diagram showing an example of changes in dew point in Examples and Comparative Examples.
- the steel sheet may be a high-strength steel sheet, a hot-dip galvanized steel sheet or an alloyed hot-dip galvanized steel sheet, but is not limited to a specific type.
- a continuous hot-dip galvanizing facility is composed of, for example, a continuous annealing furnace and a plating device following the continuous annealing furnace.
- the alloying hot-dip galvanizing equipment comprises, for example, a continuous annealing furnace, a plating device following the continuous annealing furnace, and an alloying furnace.
- continuous hot-dip galvanizing equipment and alloyed hot-dip galvanizing equipment may be collectively referred to as hot-dip galvanizing equipment.
- the continuous annealing furnace provided in the hot-dip galvanizing equipment is composed of a heating furnace (heating zone) for heating the steel sheet and a soaking furnace (soaking zone) for soaking the heated steel sheet.
- the continuous annealing furnace may be a furnace that has a mechanism for heating and soaking the steel sheet, that the steel sheet travels or moves in the furnace, and that the atmosphere is controlled. It is not limited to equipment and format.
- the heating furnace can be, for example, a direct fired furnace (DFF) type or a non-oxidizing furnace (NOF) type.
- the soaking furnace may be of a radiant tube furnace (RTF) type.
- the continuous annealing furnace may be of all radiant tube type, in which everything from the heating furnace to the soaking furnace is of the radiant tube (radiation) type.
- a dew point control method for a continuous annealing furnace is a continuous hot dip galvanizing facility or an alloying facility equipped with a continuous annealing furnace including a DFF heating furnace and an RTF soaking furnace or an NOF heating furnace and an RTF soaking furnace. It is used in hot-dip galvanizing equipment and has excellent effects compared to conventional technology. Furthermore, the continuous annealing furnace dew point control method according to the present embodiment is used in a continuous hot dip galvanizing facility or an alloyed hot dip galvanizing facility equipped with an all-radiant tube type continuous annealing furnace, and is superior to the conventional technology. Effective.
- a reduction furnace refers to a furnace portion equipped with a radiant tube.
- the reducing furnace refers to the soaking furnace.
- the reducing furnace refers to a heating furnace and a soaking furnace.
- FIG. 1 is a diagram illustrating a configuration example of a continuous hot-dip galvanizing facility 100 including a continuous annealing furnace 20 and a plating device 22.
- FIG. A continuous annealing furnace 20 comprises a heating zone 10 , a soaking zone 12 , a rapid cooling zone 14 and a slow cooling zone 16 .
- the combination of the rapid cooling zone 14 and the slow cooling zone 16 may be referred to as a cooling zone.
- the heating zone 10 is composed of a preheating zone 10A and a direct-fired furnace (DFF) 10B.
- the soaking zone 12 is also a radiant furnace (RTF), hereinafter also referred to as a reducing furnace. Also shown in FIG.
- the continuous hot dip galvanizing facility 100 may further comprise an alloying furnace 23 and be configured as an alloyed hot dip galvanizing facility.
- Fig. 2 shows an example of a furnace gas supply route in a reduction furnace.
- the reducing furnace includes a humidifying device 26, a circulating constant temperature water tank 28, a gas distribution device 24, an input gas dew point meter 32, humidification gas input ports 36A to 36C, 38A to 38C, 40A to 40C, common dry gas inlets 42A-42H, supply nozzles 44A-44G, and furnace dew point sampling point 46.
- the in-furnace dew point is the dew point of the atmosphere gas in the continuous annealing furnace.
- the supply nozzles 44A to 44G are nozzles for supplying dry gas along the inner walls of the furnace when the dew point in the furnace is lowered. Further, the inner wall of the furnace is the furnace wall inside the furnace.
- N 2 +H 2 dry N 2 or a mixed gas of N 2 and H 2 (hereinafter referred to as “N 2 +H 2 ”) with a dew point of ⁇ 60 to ⁇ 40° C. is supplied from dry gas inlets 42A to 42H to the reduction furnace. available) is always supplied. In this embodiment, part of the supply gas is supplied into the furnace after being humidified by the humidifier 26 .
- the humidifying device 26 includes a humidifying module having a fluorine-based or polyimide-based hollow fiber membrane, flat membrane, or the like. The humidifier 26 circulates dry gas inside the membrane and circulates pure water adjusted to a predetermined temperature in a constant temperature circulating water tank 28 outside the membrane.
- Hollow fiber membranes or flat membranes are a type of ion exchange membranes that have an affinity for water molecules.
- a force is generated to equalize the difference in concentration, and the force is used as a driving force to move the water through the membrane toward a lower water concentration.
- the temperature of the dry gas before humidification varies according to the season and daily temperature changes.
- the humidifier 26 also performs heat exchange by sufficiently increasing the contact area between the gas and water via the water vapor permeable membrane. becomes gas humidified to the same dew point as the set water temperature, enabling highly accurate dew point control.
- the temperature of the gas thus humidified by the humidifier 26 (hereinafter referred to as "humidified gas”) can be arbitrarily controlled within a range of 5 to 50.degree.
- humidified gas is fed directly into the continuous annealing furnace.
- the reducing furnace atmosphere is controlled throughout the furnace by instrumentation and process computers.
- the instrumentation and process computer also manage the dew point by appropriately measuring it and outputting the result to the control system of the humidifier. If the dew point in the furnace is below the target range, the humidifier 26 supplies gas with a high dew point by increasing the temperature of the circulating water. Also, if the dew point in the furnace exceeds the target range, the humidifier 26 supplies gas with a low dew point by lowering the temperature of the circulating water.
- dry gas is supplied from nozzles 44A to 44G (supply of dry gas along the furnace wall) separately from the supply of humidified gas from nozzles 42A to 42H.
- the stopping of the humidified gas and the supply of the dry gas along the furnace wall may be performed simultaneously, or the dry gas may be supplied along the furnace wall after a time interval has passed since the humidified gas is stopped. It may also be implemented to increase the supply of dry gas along the furnace wall while reducing the supply of humidified gas.
- the flow rate is reduced to less than 1/2, more preferably to less than 1/3, the flow rate of the dry gas supply, the dew point in the furnace can be controlled in a short time.
- the process (reduction annealing process) performed in the reduction furnace reduces iron oxides formed on the surface of the steel sheet in the oxidation treatment process in the heating zone 10 .
- alloying elements such as Si and Mn are formed as internal oxides inside the steel sheet due to oxygen supplied from the iron oxides.
- a reduced iron layer reduced from iron oxide is formed on the outermost surface of the steel sheet, and Si, Mn, etc. remain inside the steel sheet as internal oxides. Therefore, the oxidation of Si, Mn, etc. on the surface of the steel sheet is suppressed, the deterioration of wettability between the steel sheet and the hot-dip coating can be prevented, and good coating adhesion can be obtained.
- a dew point in the furnace of ⁇ 30 ° C. or less is appropriate. Furthermore, it is desirable to adjust the dew point in the furnace to about -15 to -5°C.
- high-strength steel sheets (980 MPa or more) have the problem of hydrogen embrittlement resistance in the part where bending is performed, and by providing a decarburized layer of about 50 ⁇ m on the surface layer of the steel sheet after annealing, bending characteristics are significantly improved. be able to.
- the inventors of the present invention have found that bending properties can be remarkably improved by setting the dew point in the furnace to +5 to +20°C, preferably +10 to +15°C.
- some steel types have an appropriate dew point of +5 to +20°C, so equipment that can quickly control the dew point inside the furnace is required in actual operation.
- raising the dew point it is possible to adjust to the desired dew point in several minutes by supplying an appropriate amount of humidified gas by the above method.
- the dew point is lowered, it takes a long time to release moisture from the furnace wall and heat insulating material simply by replacing the gas in the furnace.
- surface defects such as non-plating and pick-up may occur. Specifically, it is difficult to change the furnace dew point from +5° C. or higher to less than 0° C.
- the supply of humidified gas responsible for raising the dew point into the furnace is stopped or reduced, and the inner wall of the continuous annealing furnace implement a dew point control method that supplies a dry gas along. This method made it possible to accelerate the release of moisture from the furnace wall.
- FIG. 3 shows a conventional dry gas supply method for a reducing furnace.
- dry gas was supplied into the furnace from a gas pipe installed vertically on the furnace wall.
- a pipe having a size of 25A to 50A for example, is used.
- the ejection speed into the furnace is about 2 to 50 m/s.
- the dry gas is immediately mixed with the gas in the furnace, so the dew point near the inner wall of the furnace cannot be lowered efficiently. Even if the dew point in the center of the furnace is lowered, the dew point near the inner wall of the furnace is not lowered, and water is released little by little from the wall of the furnace.
- the present inventors found that by actively lowering the dew point near the inner wall of the furnace to create a difference in moisture concentration, the moisture contained in the furnace wall and the heat insulating material can be removed from the dry gas flowing along the inner wall of the furnace. It was found that it is possible to efficiently release into the inside.
- FIG. 4 shows an example of a nozzle (for example, supply nozzle 44C) of a reducing furnace of hot-dip galvanizing equipment including a continuous annealing furnace according to this embodiment.
- the continuous annealing furnace according to this embodiment includes a nozzle capable of supplying gas along the inner wall of the furnace.
- the gas supplied from the nozzle includes dry gas. That is, in this embodiment, the nozzle can supply dry gas along the inner wall of the furnace.
- the nozzle is preferably a slit nozzle as shown in FIG.
- the type and shape of the nozzle are not particularly limited.
- the nozzle may have a shape like a wiping nozzle.
- the slit nozzle in FIG. 4 has a slit width of 2 to 10 mm toward the inner wall of the furnace, for example, in a part of the circular pipe extending in the width direction of the steel plate.
- the slit length (gas injection effective length) of the slit nozzle is about the maximum width of the steel sheet to be passed.
- the slit is inclined at an injection angle ⁇ with respect to the inner wall of the furnace, and the dry gas is injected toward the inner wall of the furnace.
- the injection angle ⁇ is, for example, in the range of 5-45°. In other words, the angle formed by the gas injected from the slit nozzle to the inner wall of the furnace and the inner wall of the furnace is 5° or more and 45° or less.
- the gas injection speed may be adjusted to about 2 to 20 m/s.
- the nozzle slit width is B [mm]
- the distance between the nozzle injection port and the furnace inner wall considering the injection angle (see FIG. 4) is D [mm]
- the injection speed is V [m/s]
- collision Vs [m/s] which is the wind speed
- Vs ⁇ 0.8 m/s it is possible to maintain the wall surface jet and reduce the moisture concentration in the vicinity of the wall surface.
- Vs 3.46*V* ⁇ ((B/D)/2)
- the supply nozzles 44A to 44G are desirably provided on the furnace top wall and all the furnace side walls. However, if the supply nozzle is provided in the hearth, foreign matter may be stirred up, so the supply nozzle may be provided outside the hearth.
- the supplied dry gas may be cooler than the furnace ambient temperature.
- the furnace atmosphere temperature is the temperature of the furnace atmosphere gas in the continuous annealing furnace. When the temperature of the dry gas is lower than the temperature of the atmosphere inside the furnace, it is difficult to maintain the wall surface jet flow at the top of the furnace due to the temperature difference between the dry gas and the atmosphere gas. Therefore, it is preferable that the supply nozzles are provided at intervals of 3 to 5 m on the furnace top wall.
- the distance between the supply nozzle 44C and the supply nozzle 44D in FIG. 2 may be 3 to 5 m.
- the injection direction may be the upstream direction of the continuous annealing furnace, the downstream direction, or the width direction of the steel sheet. It is preferable to inject the gas downward from the top of the reduction furnace in order to utilize the property that the low-temperature gas descends on the furnace side wall.
- the height of a continuous annealing furnace is about 20 to 30 m, it is preferable that they are provided at intervals of about 10 m in the height direction on the side wall of the furnace.
- the distance between the supply nozzle 44A and the supply nozzle 44B in FIG. 2 may be about 10 m.
- a mixed gas of N 2 and H 2 with a dew point of about ⁇ 70 to ⁇ 50° C. can be used as the dry gas, like the dry gas of the prior art.
- the inventors further found that the release of moisture from the furnace wall and heat insulating material is promoted by setting the furnace inner wall of the continuous annealing furnace to a temperature higher than the atmosphere temperature in the furnace by 30°C or more. At this time, the temperature of the furnace inner wall of the continuous annealing furnace may be higher than the atmosphere temperature in the furnace within a range of 30° C. or more and 50° C. or less.
- FIG. 5 shows an example of a device for heating and controlling the inner wall of the reduction furnace.
- the reduction furnace includes heating elements 50A to 50E which are heating mechanisms for heating the inner wall of the furnace, thermometers 52A to 52E for measuring the temperature of the inner wall of the furnace, and controllers 54A to 54E.
- the controllers 54A-54E control the heating amounts of the heating elements 50A-50E based on the temperature of the inner wall of the furnace measured by the thermometers 52A-52E.
- the heating amounts of the heating elements 50A-50E are adjusted, for example, by control devices 54A-54E controlling the amount of current flowing through the heating elements 50A-50E.
- the inner wall of the reduction furnace during actual operation is at, for example, 700 to 900° C.
- the heating elements 50A to 50E may have a heating capacity capable of further heating 30 to 50° C. from the temperature in the furnace due to the radiant heat of the radiant tube.
- the heating capacity of the heating elements 50A-50E may be 30-50.degree.
- Example 4 In a continuous hot dip galvanizing facility (CGL) having a DFF type heating furnace in a continuous annealing furnace, the heating burners of the DFF type heating furnace were divided into four groups (Group 1 to Group 4). As an oxidation zone, three groups (groups 1 to 3) of heating burners were arranged upstream in the direction of movement of the strip in the continuous annealing furnace. As a reduction zone, the remaining one group (group 4) of heating burners was arranged downstream of the oxidation zone in the direction of movement of the steel plate. Tests were conducted with separate control of the air ratios in the oxidation and reduction zones. The length of each of the oxidation and reduction zones is 4 m.
- a humidifier having a hollow fiber membrane type humidifier was used to condition the gas in the continuous annealing furnace.
- the humidified gas adjusted by the humidifier was directly supplied to the continuous annealing furnace.
- Commonly used dry gas inlets were provided at a total of eight locations as in FIG.
- Humidified gas inlets were provided at a total of nine locations as in FIG.
- the hollow fiber membrane type humidifying section of the humidifying device has 10 membrane modules. Each membrane module was configured to flow a maximum of 500 liters/min of N 2 +H 2 mixed gas and a maximum of 10 liters/min of circulating water.
- the N 2 +H 2 mixed gas is a dry gas whose composition has been adjusted in advance for charging into a continuous annealing furnace, and has a constant dew point of -50°C.
- a circulation constant temperature water bath is common to ten membrane modules, and can supply a total of 100 liters/min of pure water.
- Dry gas for lowering the dew point in the furnace is provided by supply nozzles 44A to 44G arranged at the positions shown in FIG. 2 and two supply nozzles arranged at two locations on the side wall of the furnace. supplied from.
- Each of these supply nozzles has a nozzle slit width of 4 [mm], a length (in the width direction of the steel sheet) of 2 m, an injection angle ⁇ to the inner wall of the furnace of 30°, and The distance D to is 80 mm.
- the dry gas was injected at a gas injection speed of 2.35 m/s and a collision wind speed Vs of 1.29 m/s. At this time, the total flow rate of the dry gas into the furnace was about 600 Nm 3 /hr.
- Patent Document 2 Japanese Patent Application Laid-Open No. 2012-111995
- Dry gas was supplied from Other conditions are as shown in Table 2.
- the time required for the dew point in the furnace to drop to -20°C or less exceeded 90 minutes in the comparative example, but was shortened to 20 minutes in the example.
- the measurement position of the in-furnace dew point is the sampling point 46 in FIG.
- Patent Document 2 Japanese Patent Laid-Open No. 2012-111995
- Patent Document 3 Japanese Patent Laid-Open No. 2016-125131
- the plating bath temperature was 460°C.
- Al concentration in the plating bath was 0.130%.
- the coating weight was adjusted to 45 g/m 2 per side by gas wiping.
- alloying treatment was performed in an induction-heating alloying furnace at an alloying temperature so that the alloying degree (Fe content) of the film was within 10 to 13%.
- the appearance of the plating was evaluated by inspecting it with an optical surface defect meter (detecting the presence or absence of non-plating defects and pick-up defects).
- VG if the defect occurrence rate is 0.1% or less over the entire length of the coil, G if 0.1 to 1.0%, B if 1.0 to 5.0%, and 5.0% or more VB if available.
- the condition for passing the comprehensive evaluation is that the evaluation of plating appearance is VG or G.
- the material strength (tensile strength) was measured and evaluated.
- the condition for passing the comprehensive evaluation is that the material strength is equal to or higher than the reference value.
- the standard value for steel type A is 1180 MPa.
- the standard value for steel type B is 1470 MPa.
- the standard value for steel type C is 980 MPa.
- the standard value for steel type D is 590 MPa.
- a strip-shaped test piece with a width of 30 mm and a length of 100 mm was taken with the direction parallel to the rolling direction as the bending test axis direction, and a bending test was performed.
- a 90° V bending test was performed under conditions of a stroke speed of 50 mm/s, an indentation load of 10 tons, and a pressing holding time of 5 seconds.
- the ridgeline portion of the bending apex was observed with a magnifying glass of 10 times, and the minimum bending radius at which cracks with a crack length of 0.5 mm or more could not be observed was determined.
- the ratio (R/t) of the minimum bending radius R to the plate thickness t was calculated, and bendability was evaluated by the ratio (R/t).
- the condition for passing the comprehensive evaluation is that the ratio (R/t) is equal to or less than the reference value.
- the reference value for steel type A is 3.5.
- the reference value for steel type B is 5.0.
- the reference value for steel type C is 1.5.
- the reference value for steel type D is 0.5.
- the continuous annealing furnace dew point control method, the steel sheet continuous annealing method, the steel sheet manufacturing method, the continuous annealing furnace, the continuous hot dip galvanizing equipment, and the alloying hot dip galvanizing equipment according to the present embodiment have the above configurations. And, depending on the process, the dew point in the furnace can be controlled in a short time. Further, as is clear from the comparison between the examples and comparative examples in Tables 3 and 4, according to the present disclosure, when producing high-strength steel sheets containing various components, production can be performed without reducing productivity. It is possible.
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Abstract
Description
連続焼鈍炉において、加湿ガスの炉内への供給を停止して又は減らして、前記連続焼鈍炉の炉内壁に沿って乾燥ガスを供給する。
上記の連続焼鈍炉の露点制御方法を用いて、炉内露点を制御する。
上記の鋼板の連続焼鈍方法を用いて高張力鋼板、溶融亜鉛めっき鋼板又は合金化溶融亜鉛めっき鋼板を製造する。
炉内壁に沿ってガスを供給できるノズルを備え、前記ノズルから供給されるガスは乾燥ガスを含む。
上記の連続焼鈍炉と、前記連続焼鈍炉に続くめっき装置を備える。
上記の連続焼鈍炉と、前記連続焼鈍炉に続くめっき装置及び合金化炉を備える。
連続焼鈍炉にDFF型加熱炉を備える連続溶融亜鉛めっき設備(CGL)において、DFF型加熱炉の加熱用バーナーは4つの群(グループ1~グループ4)に分割された。酸化ゾーンとして、連続焼鈍炉における鋼板移動方向の上流側に3つの群(グループ1~グループ3)の加熱用バーナーが配置された。また、還元ゾーンとして、酸化ゾーンよりも鋼板移動方向の下流側に残りの1つの群(グループ4)の加熱用バーナーが配置された。酸化ゾーン及び還元ゾーンの空気比を個別に制御して試験が行われた。酸化ゾーン及び還元ゾーンのそれぞれの長さは4mである。
10A 予熱帯
10B 直火炉
12 均熱帯
14 急冷帯
16 徐冷帯
18 スナウト
20 連続焼鈍炉
22 めっき装置
23 合金化炉
24 ガス分配装置
26 加湿装置
28 循環恒温水槽
36A~36C 加湿ガス投入口
38A~38C 加湿ガス投入口
40A~40C 加湿ガス投入口
42 常用のガス供給口
42A~42H 常用の乾燥ガス投入口
44A~44G 供給ノズル
46 採取箇所
50A~50E 発熱体
52A~52E 温度計
54A~54E 制御装置
100 連続溶融亜鉛めっき設備
Claims (11)
- 連続焼鈍炉において、加湿ガスの炉内への供給を停止して又は減らして、前記連続焼鈍炉の炉内壁に沿って乾燥ガスを供給する、連続焼鈍炉の露点制御方法。
- 連続焼鈍炉において、前記連続焼鈍炉の炉内壁を炉内雰囲気温度より30℃以上高温にする、請求項1に記載の連続焼鈍炉の露点制御方法。
- 炉内露点を5℃以上の露点から0℃未満の露点に変更する、請求項1又は2に記載の連続焼鈍炉の露点制御方法。
- 連続焼鈍炉において炉内から炉内壁に噴射される乾燥ガスと前記炉内壁とがなす角度が5°以上かつ45°以下であって、前記乾燥ガスの前記炉内壁への衝突風速が0.8m/s以上であるように制御する、請求項1から3のいずれか一項に記載の連続焼鈍炉の露点制御方法。
- 請求項1から4のいずれか一項に記載の連続焼鈍炉の露点制御方法を用いて、炉内露点を制御する、鋼板の連続焼鈍方法。
- 請求項5に記載の鋼板の連続焼鈍方法を用いて高張力鋼板、溶融亜鉛めっき鋼板又は合金化溶融亜鉛めっき鋼板を製造する鋼板の製造方法。
- 炉内壁に沿ってガスを供給できるノズルを備え、前記ノズルから供給されるガスは乾燥ガスを含む、連続焼鈍炉。
- 炉内の炉頂壁及び炉側壁の少なくとも1つにガスを噴射するノズルを備え、前記ノズルから炉内壁に噴射される前記ガスと前記炉内壁とがなす角度が5°以上かつ45°以下である、請求項7に記載の連続焼鈍炉。
- 炉内壁を炉内雰囲気温度より30℃以上高温に加熱できる加熱機構を備える、請求項7又は8に記載の連続焼鈍炉。
- 請求項7から9のいずれか一項に記載の連続焼鈍炉と、前記連続焼鈍炉に続くめっき装置を備える、連続溶融亜鉛めっき設備。
- 請求項7から9のいずれか一項に記載の連続焼鈍炉と、前記連続焼鈍炉に続くめっき装置及び合金化炉を備える、合金化溶融亜鉛めっき設備。
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CN202280031988.0A CN117255866A (zh) | 2021-05-06 | 2022-02-08 | 连续退火炉的露点控制方法、钢板的连续退火方法、钢板的制造方法、连续退火炉、连续热浸镀锌设备以及合金化热浸镀锌设备 |
KR1020237037743A KR20230162110A (ko) | 2021-05-06 | 2022-02-08 | 연속 어닐링로의 노점 제어 방법, 강판의 연속 어닐링 방법, 강판의 제조 방법, 연속 어닐링로, 연속 용융 아연 도금 설비 및 합금화 용융 아연 도금 설비 |
EP22798809.4A EP4310207A1 (en) | 2021-05-06 | 2022-02-08 | Method for controlling dew point of continuous annealing furnace, continuous annealing method for steel sheets, method for producing steel sheet, continuous annealing furnace, continuous hot dip galvanization facility and alloyed hot dip galvanization facility |
JP2022526834A JP7334860B2 (ja) | 2021-05-06 | 2022-02-08 | 連続焼鈍炉の露点制御方法、鋼板の連続焼鈍方法、鋼板の製造方法、連続焼鈍炉、連続溶融亜鉛めっき設備及び合金化溶融亜鉛めっき設備 |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61253327A (ja) * | 1985-04-30 | 1986-11-11 | Sumitomo Metal Ind Ltd | 加熱炉の露点低下方法 |
JPH0762450A (ja) * | 1993-08-27 | 1995-03-07 | Nippon Steel Corp | 連続焼鈍炉における鋼帯エッジ部過加熱防止法 |
JP2012111995A (ja) | 2010-11-25 | 2012-06-14 | Jfe Steel Corp | 連続焼鈍炉の炉内雰囲気調整方法 |
JP2016125131A (ja) | 2015-01-08 | 2016-07-11 | Jfeスチール株式会社 | 合金化溶融亜鉛めっき鋼板の製造方法 |
JP2020520408A (ja) * | 2017-03-22 | 2020-07-09 | フィブ スタン | 乾式冷却と湿式冷却を組み合わせた、連続的ラインを冷却するためのセクション及び方法 |
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US11680303B2 (en) | 2018-03-30 | 2023-06-20 | Nippon Steel Corporation | Steel sheet and manufacturing method therefor |
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61253327A (ja) * | 1985-04-30 | 1986-11-11 | Sumitomo Metal Ind Ltd | 加熱炉の露点低下方法 |
JPH0762450A (ja) * | 1993-08-27 | 1995-03-07 | Nippon Steel Corp | 連続焼鈍炉における鋼帯エッジ部過加熱防止法 |
JP2012111995A (ja) | 2010-11-25 | 2012-06-14 | Jfe Steel Corp | 連続焼鈍炉の炉内雰囲気調整方法 |
JP2016125131A (ja) | 2015-01-08 | 2016-07-11 | Jfeスチール株式会社 | 合金化溶融亜鉛めっき鋼板の製造方法 |
JP2020520408A (ja) * | 2017-03-22 | 2020-07-09 | フィブ スタン | 乾式冷却と湿式冷却を組み合わせた、連続的ラインを冷却するためのセクション及び方法 |
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