EP3287541B1 - Production apparatus and production method for molten metal plated steel strip - Google Patents

Production apparatus and production method for molten metal plated steel strip Download PDF

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Publication number
EP3287541B1
EP3287541B1 EP16782783.1A EP16782783A EP3287541B1 EP 3287541 B1 EP3287541 B1 EP 3287541B1 EP 16782783 A EP16782783 A EP 16782783A EP 3287541 B1 EP3287541 B1 EP 3287541B1
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EP
European Patent Office
Prior art keywords
steel strip
gas
temperature
hot
baffle plate
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EP16782783.1A
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German (de)
English (en)
French (fr)
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EP3287541A1 (en
EP3287541A4 (en
Inventor
Yu TERASAKI
Hideyuki Takahashi
Masaru Miyake
Takumi Koyama
Yusuke YASUFUKU
Atsushi Inaba
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JFE Steel Corp
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JFE Steel Corp
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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
    • C23C2/003—Apparatus
    • 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
    • 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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • 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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C23C2/20—Strips; Plates
    • 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
    • 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
    • C23C2/50—Controlling or regulating the coating processes
    • C23C2/51—Computer-controlled implementation
    • 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
    • C23C2/50—Controlling or regulating the coating processes
    • C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing

Definitions

  • the disclosure relates to an apparatus and a method for producing a hot-dip metal coated steel strip, and particularly relates to gas wiping for adjusting the coating weight on the steel strip surface.
  • a steel strip P annealed in a continuous annealing furnace with a reducing atmosphere passes through a snout 10, and is continuously introduced into a molten metal bath 14 in a coating tank 12.
  • the steel strip P is then pulled upward from the molten metal bath 14 through a sink roll 16 and support rolls 18 in the molten metal bath 14, and adjusted to have a predetermined coating thickness by gas wiping nozzles 20A and 20B. After this, the steel strip P is cooled, and guided to subsequent steps.
  • the gas wiping nozzles 20A and 20B face each other with the steel strip P therebetween, above the coating tank 12.
  • the gas wiping nozzles 20A and 20B spray gas onto both surfaces of the steel strip P from their jet orifices. By this gas wiping, excess molten metal is wiped away to adjust the coating weight on the steel strip surface and also uniformize, in the sheet transverse (width) direction and the sheet longitudinal direction, the molten metal adhering to the steel strip surface.
  • the gas wiping nozzles 20A and 20B are each typically made longer than the steel strip width to accommodate various steel strip widths and also cope with, for example, a displacement of the steel strip in the transverse direction when pulling the steel strip up. The gas wiping nozzles 20A and 20B thus each extend outward beyond the transverse edges of the steel strip.
  • splashing that is, molten metal dropping downward and splattering on the steel strip due to the disturbance of the gas jet colliding against the steel strip.
  • Splashed molten metal adheres to the steel strip surface, and lowers the surface quality of the coated steel strip.
  • the problem of splashing is more apparent when the pressure of the gas (hereafter simply referred to as "gas pressure") sprayed from the gas wiping nozzles onto the steel strip surface is higher. Splashed molten metal also drops into the coating tank and forms top dross. This lowers the surface quality of the coated steel strip, and requires a worker to remove the top dross.
  • Production volume in the continuous steel strip production process can be increased by increasing the steel strip passing speed (line speed).
  • line speed increases the initial coating weight of the steel strip immediately after passing through the molten bath due to the viscosity of molten metal, so that higher gas pressure is needed to adjust the coating weight within a predetermined range. As a result, splashing increases significantly.
  • JP 2009-203500 A (PTL 1) describes the following hot-dip metal coated steel strip production method. A main nozzle and a pair of sub nozzles above and below the main nozzle are used for gas wiping, where the temperature of gas sprayed from the sub nozzles is 500 °C or less, and is higher than the temperature of gas sprayed from the main nozzle by 50 °C or more.
  • JP 2009-263698 A (PTL 2) describes the following hot-dip coating weight control method. Gas containing combustion gas generated by combustion inside a gas wiping nozzle is sprayed, with the gas temperature at the outlet of the gas wiping nozzle being set to 300 °C or more.
  • EP 2 594 658 A1 (PTL 3) relates to a baffle plate unit to be used in a gas wiping apparatus that removes excessive molten metal from a metal strip after molten metal coating is applied to the metal strip.
  • the baffle plate unit includes baffle plates and a position adjustment mechanism for adjusting the positions of the baffle plates.
  • the present invention further relates to a gas wiping apparatus using the baffle plate unit.
  • JP H06 116698 A (PTL 4) provides a continuous molten metal plating apparatus for a steel strip provided with a gas heating mechanism in a wiping apparatus for adjusting the amount of plating metal deposited on a continuous molten metal plating line of a steel strip.
  • JP H09 195023 A (PTL 5) relates to a gap variable gas wiping nozzle device for adjusting the adhesion amount of molten metal used in molten metal plating equipment.
  • JP H06 172955 A (PTL 6) discloses a plating thickness control device that has gas wiping nozzles which inject a high-pressure gas to a band-shaped metallic sheet subjected to plating by continuous immersion into a molten metal bath, electrodes which are provided above these nozzles and are used to energize the metallic sheet with the molten metal bath as one electrode and a temperature sensor which detects the surface temperature of the steel sheet provided above these nozzles.
  • PTL 1 and PTL 2 both specify the gas temperature Ty at the outlet of the gas wiping nozzle, which causes the following problem. Gas ejected from the gas wiping nozzle mixes with surrounding air, and gradually decreases in temperature. Therefore, in the case where the distance between the gas wiping nozzle and the steel strip is long, the gas temperature T at the steel strip collision point (stagnation point) decreases to be close to normal temperature, and the effect of heating the gas is lost. The decrease of the gas temperature depends not only on the distance between the nozzle and the steel strip, but also on conditions such as gas pressure and nozzle angle.
  • the gas temperature T at the stagnation point needs to be predicted accurately and managed within a predetermined suitable temperature range.
  • a baffle plate near a transverse edge of the steel strip and in a plane extended from the steel strip, and placing a temperature sensor on the baffle plate. Since the temperature T' measured by the temperature sensor on the baffle plate is substantially equal to the gas temperature T at the stagnation point, the gas temperature T at the stagnation point can be accurately predicted in situ.
  • the temperature of the sprayed gas i.e. the gas temperature measured immediately after leaving a gas heater
  • the temperature of the sprayed gas is feedback-controlled to manage the gas temperature T at the stagnation point (to be exact, the temperature T' measured by the temperature sensor) within a predetermined suitable temperature range.
  • production apparatus An apparatus 100 (hereafter also simply referred to as "production apparatus") and a method for producing a hot-dip metal coated steel strip according to one of the disclosed embodiments are described below, with reference to FIGS. 1 to 3 .
  • the production apparatus 100 in this embodiment includes a snout 10, a coating tank 12, a sink roll 16, and support rolls 18.
  • the snout 10 is a member that defines the space through which a steel strip P passes, and has a rectangular section perpendicular to the steel strip traveling direction.
  • the snout 10 has a tip immersed in a molten metal bath 14 formed in the coating tank 12.
  • the steel strip P annealed in a continuous annealing furnace with a reducing atmosphere passes through the snout 10, and is continuously introduced into the molten metal bath 14 in the coating tank 12.
  • the steel strip P is then pulled upward from the molten metal bath 14 through the sink roll 16 and the support rolls 18 in the molten metal bath 14, and adjusted to have a predetermined coating thickness by a pair of gas wiping nozzles 20A and 20B. After this, the steel strip P is cooled, and guided to subsequent steps.
  • the pair of gas wiping nozzles 20A and 20B face each other with the steel strip P therebetween, above the coating tank 12.
  • the nozzle 20A sprays gas onto the steel strip P from its outlet (jet orifice 34), to adjust the coating weight on the steel strip surface.
  • the other nozzle 20B operates in the same way.
  • excess molten metal is wiped away to adjust the coating weight on both surfaces of the steel strip P and also uniformize the coating weight in the sheet transverse direction and the sheet longitudinal direction.
  • the nozzles 20A and 20B are each typically made longer than the steel strip width to accommodate various steel strip widths and also cope with, for example, a displacement of the steel strip in the transverse direction when pulling the steel strip up.
  • the nozzles 20A and 20B thus each extend outward beyond the transverse edges of the steel strip.
  • the nozzle 20A includes an upper nozzle member 32A and a lower nozzle member 32B.
  • the space between the respective tips of the upper and lower nozzle members 32A and 32B forms the gas jet orifice 34 (nozzle slit).
  • the jet orifice 34 extends in the transverse direction of the steel strip.
  • the nozzle 20A has a longitudinal section that tapers down toward the tip.
  • the thickness of the tip portion of each of the upper and lower nozzle members 32A and 32B may be about 1 mm to 3 mm.
  • the opening width (slit space) of the jet orifice is not limited, and may be about 0.5 mm to 2.5 mm.
  • Gas supplied from the below-mentioned gas supply mechanism 22 passes through the gas passage defined by the upper and lower nozzle members 32A and 32B, and is ejected from the jet orifice 34 and sprayed onto the surface of the steel strip P.
  • the other nozzle 20B has the same structure.
  • the gas supply mechanism 22 supplies gas to the nozzles 20A and 20B.
  • the gas temperature adjusting mechanism 24 has a function of changing the temperature of the gas supplied from the gas supply mechanism 22 to the nozzles 20A and 20B.
  • the gas supply mechanism 22 includes a pipe through which gas at normal temperature passes, and a blower for pressurizing the gas to a predetermined pressure.
  • the gas temperature adjusting mechanism 24 includes a heat exchanger. In this case, the gas pressurized by the blower is heated to a predetermined temperature by the heat exchanger, and supplied to the nozzles 20A and 20B.
  • the gas supply and the gas temperature adjustment are not limited to the example described above, as long as the gas temperature can be changed without delay.
  • a method of mixing combustion exhaust gas in the annealing furnace with air may be used.
  • air is pressurized to a predetermined pressure by a blower, and then the air and the combustion exhaust gas are mixed to form mixed gas, which is supplied to the nozzles 20A and 20B.
  • the gas temperature adjustment is performed by changing the mixing ratio of the combustion exhaust gas. In detail, to increase the gas temperature, the ratio of the combustion exhaust gas is increased.
  • the gas supply mechanism 22 includes a pipe through which air at normal temperature passes and a blower for pressurizing the air to a predetermined pressure
  • the gas temperature adjusting mechanism 24 includes a mechanism for changing the mixing ratio of the combustion exhaust gas and the air.
  • a baffle plate 26 is located near the transverse edge of the steel strip P and in a plane extended from the steel strip P, as illustrated in FIG. 2 .
  • the baffle plate 26 is located between the pair of nozzles 20A and 20B, and prevents the gas sprayed from the pair of nozzles 20A and 20B from colliding with each other, thus contributing to reduced splashing. While FIG. 2 illustrates the baffle plate 26 located near one transverse edge of the steel strip P, the baffle plate is located near each of both transverse edges of the steel strip. This arrangement prevents a gas collision.
  • the shape of the baffle plate 26 is not limited, but is preferably rectangular as illustrated in FIG. 2 . Two sides of the rectangular shape of the baffle plate 26 are preferably in parallel with the extending direction of the transverse edge of the steel strip P.
  • the plate thickness of the baffle plate 26 is determined as appropriate in terms of ensuring stiffness, for example, preventing the baffle plate from vibrating when collided with gas.
  • the plate thickness of the baffle plate 26 may be in the range of 4 mm to 10 mm.
  • the shortest distance D1 between the baffle plate 26 and the transverse edge of the steel strip P greatly influences the splashing prevention performance, and is preferably 1 mm or more and less than 10 mm. If D1 is 10mm or more, splashing begins to appear rapidly. If D1 is less than 1 mm, there is a possibility that the baffle plate comes into contact with the steel strip.
  • the baffle plate 26 extends outward beyond the edges of the nozzles 20A and 20B in the transverse direction of the steel strip.
  • temperature sensors 28A and 28B are provided on both surfaces of the baffle plate 26, as illustrated in FIGS. 1 and 2 . Temperature sensors are also provided on both surfaces of the other baffle plate (not illustrated).
  • the form of the temperature sensors is not limited, and contact-type thermometers such as thermocouples may be used as an example.
  • Each temperature sensor can continuously measure the temperature T' of gas sprayed onto the temperature sensor. Since the measured temperature T' is substantially equal to the gas temperature T at the stagnation point, the gas temperature T at the stagnation point can be accurately predicted in situ.
  • Each temperature sensor outputs information of the continuously measured gas temperature T' to a controller 30.
  • the controller 30, having received the information of the gas temperature T' output from each temperature sensor, controls the gas temperature adjusting mechanism 24.
  • the controller 30 feedback-controls the temperature of the sprayed gas based on the measured temperature T', to manage the gas temperature T at the stagnation point (to be exact, the temperature T' measured by the temperature sensor) within a predetermined suitable temperature range.
  • the form of the controller 30 is not limited, and the controller 30 may be, for example, implemented by a central processing unit (CPU) in a computer.
  • the controller 30 controls the gas temperature adjusting mechanism 24 based on the information of the measured temperature T' received from each temperature sensor to feedback-control the temperature of the sprayed gas, in the following manner.
  • the average (for example, arithmetic mean) of the four measured temperatures received from the four temperature sensors is used as the measured temperature T'.
  • the gas temperature T at the stagnation point i.e. the measured temperature T'
  • the suitable temperature range is (the melting point of the molten metal bath) ⁇ 100 °C.
  • the gas temperature T at the stagnation point i.e. the measured temperature T'
  • the gas temperature T at the stagnation point is managed within the range of zinc's melting point 420 °C ⁇ 100 °C, that is, within the range of 320 °C to 520 °C.
  • a first example of the control is as follows. To constantly keep the measured temperature T' closer to a predetermined temperature (e.g. a median) in the suitable temperature range, the gas temperature is increased in the case where the measured temperature T' is less than the median, unchanged in the case where the measured temperature T' is equal to the median, and decreased in the case where the measured temperature T' is more than the median.
  • a predetermined temperature e.g. a median
  • a second example of the control is as follows.
  • the gas temperature is unchanged while the measured temperature T' is within the suitable temperature range, and changed only in the case where the measured temperature T' is outside the predetermined temperature range.
  • the gas temperature is increased in the case where the measured temperature T' is less than the lower limit of the suitable temperature range, and decreased in the case where the measured temperature T' is more than the upper limit of the suitable temperature range.
  • the temperature measured by each temperature sensor is thus kept within the suitable temperature range.
  • the interval at which the feedback control is performed is not limited.
  • the feedback control may be constantly performed, with the gas temperature being constantly measured continuously by each temperature sensor and the information of the measured temperature being constantly provided to the controller during operation.
  • the feedback control may be intermittently performed, with the gas temperature being intermittently measured and the information of the measured temperature being provided to the controller.
  • the constant feedback control is preferable in terms of more accurately managing the gas temperature T at the stagnation point.
  • the gas is sprayed from the pair of nozzles 20A and 20B onto the steel strip P continuously pulled up from the molten metal bath 14, to adjust the coating weight on both surfaces of the steel strip P.
  • the gas temperature T at the stagnation point can be predicated accurately, and constantly maintained and managed within the predetermined suitable temperature range. This prevents coated surface defects caused by splashing or top dross, so that a hot-dip metal coated steel strip of high quality can be produced stably.
  • the number of temperature sensors may be one, two, or three of the four.
  • one temperature sensor may be provided on one surface (one side) of the baffle plate, or two temperature sensors made up of one temperature sensor on each of both surfaces (both sides) of the baffle plate may be provided.
  • the average e.g. arithmetic mean
  • the measured temperatures of the temperature sensors is set as the measured temperature T'.
  • the production apparatus 100 in this embodiment preferably includes a mechanism capable of changing the height of the baffle plate 26 from the bath surface of the molten metal bath so that the baffle plate 26 moves in the vertical position in accordance with the height of the nozzles 20A and 20B.
  • the gas temperature can be always measured with the maximum collision pressure of the gas to the steel strip P, with it being possible to control the temperature of the sprayed gas with high accuracy.
  • the baffle plate 26 is fixed to a stand (not illustrated) of the wiping nozzles.
  • pneumatic pressure may be used as an example.
  • An edge sensor for measuring the distance D1 to the steel strip may be preferably attached to an upper portion of the baffle plate. By moving the baffle plate in the transverse direction of the steel strip while measuring the distance to the steel strip by the edge sensor, the baffle plate 26 is positioned at a target distance D1.
  • a heat insulator (not illustrated) is desirably provided between the baffle plate 26 and each of the temperature sensors 28A and 28B.
  • the heat insulator is used to prevent heat transfer from the baffle plate to the temperature sensors to thus avoid a failure to accurately measure the gas temperature.
  • the type of the heat insulator is not limited, and may be, for example, glass wool or cellulose fibers.
  • the baffle plate 26 is preferably made of a material having a thermal conductivity of 1 W ⁇ m -1 ⁇ K -1 or less.
  • the low thermal conducting material include ceramic such as alumina or silicon carbide.
  • the distance D2 between the nozzle tip and the steel strip surface is preferably in the range of 3 mm to 40 mm. If D2 is 3 mm or more, nozzle clogging caused by splashing is unlikely to occur. If D2 is 40 mm or less, the gas pressure for achieving a target coating weight can be reduced, and as a result the gas heating can be reduced.
  • the distance H between the center of the jet orifice 34 of the nozzle and the center of the temperature sensor 28 in the vertical direction is in the range of 0 mm to 5 mm. If H is 5 mm or less, the temperature T' of the gas sprayed onto the temperature sensor can be measured more accurately.
  • a hot-dip metal coated steel strip produced by the disclosed production apparatus and method is, for example, a hot-dip galvanized steel sheet.
  • the hot-dip galvanized steel sheet include a galvanized steel sheet (GI) obtained without alloying treatment after hot-dip galvanizing treatment and a galvannealed steel sheet (GA) obtained by performing alloying treatment after hot-dip galvanizing treatment.
  • a hot-dip galvanized steel strip production test was conducted in a hot-dip galvanized steel strip production line.
  • the production apparatus illustrated in FIGS. 1 to 3 was used in Examples 1 to 5, and the production apparatus illustrated in FIG. 4 was used in Comparative Example. Gas wiping nozzles with a slit space of 1.2 mm were used. The gas spray direction was perpendicular to the steel strip surface.
  • the experiment was conducted under a total of 10 sets of operation conditions, by varying the nozzle height from the hot-dip zinc molten bath surface in the range of 250 mm to 400 mm, varying the distance D2 between the nozzle tip and the steel strip surface in the range of 0 mm to 25 mm, varying the passing speed of a steel strip of 0.8 mm in sheet thickness and 1000 mm in sheet width in the range of 120 m/min to 180 m/min in line speed, and varying the gas pressure in the range of 50 kPa to 100 kPa.
  • the line speed, the gas pressure, and the distance D2 were set so as to obtain a uniform coating weight of about 50 g/m 2 .
  • a method of supplying gas obtained by heating gas of normal temperature to a predetermined temperature by a heat exchanger and pressurizing it to a predetermined pressure by a blower was used.
  • each baffle plate made up of one baffle plate near each of both transverse edges of the steel strip.
  • four temperature sensors made up of one temperature sensor at a center portion of each of both surfaces of each of the baffle plates were arranged.
  • the size of each baffle plate was 50 mm in height (dimension in the steel strip traveling direction), 200 mm in width (dimension in the steel strip transverse direction), and 5 mm in thickness.
  • the distance D1 between each baffle plate and the transverse edge of the steel strip was 10 mm in Example 1, and 5 mm in Examples 2 to 5.
  • the gas temperature T at the stagnation point was predicted based on the temperature measured by each temperature sensor, and the temperature of the sprayed gas was feedback-controlled.
  • the arithmetic mean of the four measured temperatures sent from the four temperature sensors was used as the measured temperature T'.
  • the gas temperature was unchanged in the case where the measured temperature T' was within the range of 320 °C to 520 °C, increased in the case where the measured temperature T' was less than 320 °C, and decreased in the case where the measured temperature T' was more than 520 °C. This control was continuously performed during operation.
  • the baffle plates were made of SUS304 (thermal conductivity of 17 W ⁇ m -1 ⁇ K -1 ).
  • glass wool was placed between the baffle plates made of SUS304 and the temperature sensors, as a heat insulator.
  • the baffle plates were made of alumina having low thermal conductivity (thermal conductivity of 0.20 W ⁇ m -1 ⁇ K -1 ), and glass wool was placed between the baffle plates and the temperature sensors as a heat insulator.
  • the baffle plates were made of alumina having low thermal conductivity, glass wool was placed between the baffle plates and the temperature sensors as a heat insulator, and a mechanism capable of changing the height of the baffle plates from the bath surface was used.
  • the splashing ratio is defined as the ratio of a steel strip length judged as having a splashing defect in an inspection process to the length of the steel strip passed under each set of production conditions.
  • the splashing defect means a coated surface defect caused by (due to) splashing, the coated surface defect including a slight one which is practically insignificant.
  • the top dross quantity is defined as the top dross weight measured by scooping up, with a ladle, top dross floating on the bath surface after sheet passing for one hour. In the experiment, the hot-dip zinc molten bath temperature was set to 460 °C.
  • FIG. 5 illustrates the splashing ratio under the sets of conditions.
  • the average of splashing ratios under the 10 sets of operation conditions in each Example is normalized, with the average of splashing ratios under the 10 sets of operation conditions in Comparative Example being set to 100.
  • the standard deviation of the splashing ratio in each of Comparative Example and Examples is illustrated, too.
  • FIG. 6 illustrates the top dross quantity and its standard deviation under the sets of conditions.
  • Example 1 the splashing ratio was reduced as compared with Comparative Example.
  • the standard deviation ⁇ was also reduced from 0.26 to 0.088.
  • the top dross quantity was equally reduced in Example 1 as compared with Comparative Example.
  • Example 2 the splashing ratio and its standard deviation and the top dross quantity were further reduced as compared with Example 1. A shorter distance D1 than in Example 1 seems to contribute to higher splashing prevention effect.
  • Example 3 the splashing quantity and its standard deviation and the top dross quantity were further reduced as compared with Example 1. This can be attributed to highly accurate measurement of the temperature T' of the gas sprayed onto the temperature sensors.
  • Example 5 the splashing quantity and its standard deviation and the top dross quantity were further reduced as compared with Examples 3 and 4. This can be attributed to highly accurate measurement of the temperature T' of the gas sprayed onto the temperature sensors by moving the baffle plates in the vertical direction, in addition to the effect of the heat insulator.
  • the disclosed apparatus and method for producing a hot-dip metal coated steel strip can stably produce a hot-dip metal coated steel strip of high quality by preventing coated surface defects caused by splashing or top dross even in the case where operation conditions vary.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Computer Hardware Design (AREA)
  • Coating With Molten Metal (AREA)
EP16782783.1A 2015-04-20 2016-04-13 Production apparatus and production method for molten metal plated steel strip Active EP3287541B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015086079A JP6044669B2 (ja) 2015-04-20 2015-04-20 溶融金属めっき鋼帯の製造装置及び製造方法
PCT/JP2016/002007 WO2016170757A1 (ja) 2015-04-20 2016-04-13 溶融金属めっき鋼帯の製造装置及び製造方法

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EP3287541A1 EP3287541A1 (en) 2018-02-28
EP3287541A4 EP3287541A4 (en) 2018-04-04
EP3287541B1 true EP3287541B1 (en) 2019-07-24

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JP (1) JP6044669B2 (zh)
CN (1) CN107532271B (zh)
AU (1) AU2016252193B2 (zh)
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US11802329B2 (en) 2018-08-22 2023-10-31 Jfe Steel Corporation Method of producing hot-dip metal coated steel strip and continuous hot-dip metal coating line

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JP6697418B2 (ja) * 2017-05-31 2020-05-20 Ｊｆｅスチール株式会社 高温ガスワイピング装置
JP6638872B1 (ja) * 2018-08-22 2020-01-29 Ｊｆｅスチール株式会社 溶融金属めっき鋼帯の製造方法及び連続溶融金属めっき設備
CN109777979B (zh) * 2019-02-19 2020-10-30 中南大学 一种调控超宽幅铝合金板材横断面组织均匀性的方法
CN112481573B (zh) * 2020-12-18 2023-02-17 江阴市华达机械科技有限公司 气刀边部挡板总成

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JPH06116698A (ja) * 1992-10-06 1994-04-26 Sumitomo Metal Ind Ltd 鋼帯の連続溶融金属めっき装置
JPH06172955A (ja) * 1992-12-01 1994-06-21 Sumitomo Metal Ind Ltd 溶融めっき金属板のめっき厚制御装置及び制御方法
JPH09195023A (ja) * 1996-01-11 1997-07-29 Sumitomo Metal Ind Ltd ギャップ可変式ガスワイピングノズル装置
JP4468718B2 (ja) * 2004-03-10 2010-05-26 日新製鋼株式会社 溶融めっき鋼板の表面外観調整方法および表面外観調整装置
JP4862479B2 (ja) * 2006-05-12 2012-01-25 Ｊｆｅスチール株式会社 溶融金属めっき鋼帯の製造方法
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JP5493260B2 (ja) * 2007-10-09 2014-05-14 Ｊｆｅスチール株式会社 溶融金属めっき鋼帯製造装置及び溶融金属めっき鋼帯の製造方法
JP5812581B2 (ja) * 2010-07-13 2015-11-17 スチールプランテック株式会社 バッフルプレートユニットおよびそれを用いたガスワイピング装置

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US11802329B2 (en) 2018-08-22 2023-10-31 Jfe Steel Corporation Method of producing hot-dip metal coated steel strip and continuous hot-dip metal coating line

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Publication number Publication date
CN107532271B (zh) 2020-09-22
JP2016204694A (ja) 2016-12-08
CN107532271A (zh) 2018-01-02
EP3287541A1 (en) 2018-02-28
JP6044669B2 (ja) 2016-12-14
WO2016170757A1 (ja) 2016-10-27
MX2017013462A (es) 2017-12-07
EP3287541A4 (en) 2018-04-04
AU2016252193B2 (en) 2018-10-18
AU2016252193A1 (en) 2017-10-26

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