CN107532271B - Apparatus and method for manufacturing hot-dip metal coated steel strip - Google Patents
Apparatus and method for manufacturing hot-dip metal coated steel strip Download PDFInfo
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- CN107532271B CN107532271B CN201680022555.3A CN201680022555A CN107532271B CN 107532271 B CN107532271 B CN 107532271B CN 201680022555 A CN201680022555 A CN 201680022555A CN 107532271 B CN107532271 B CN 107532271B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 34
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- 238000000137 annealing Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
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- 238000005275 alloying Methods 0.000 description 2
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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
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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
-
- 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
Abstract
The invention provides a device for manufacturing a hot-dip metal steel strip, which can stably manufacture a high-quality hot-dip metal steel strip by inhibiting the generation of coating surface defects caused by splashes and top dross even under the condition that the operation conditions are changed. The device (100) for producing a hot-dip coated metal steel strip according to the present invention is characterized by comprising: the device comprises a pair of gas wiping nozzles (20A, 20B) for adjusting the coating adhesion amount on both surfaces of a steel strip (P), a gas supply mechanism (22), a gas temperature adjusting mechanism (24), a baffle plate (26) arranged on the steel strip extending surface near the end part of the steel strip (P) in the width direction, a temperature sensor (28) arranged on at least one surface of the baffle plate, and a control part (30) for controlling the gas temperature adjusting mechanism (24) based on the output of the temperature sensor (28).
Description
Technical Field
The present invention relates to an apparatus and a method for producing a hot-dip coated metal steel strip, and more particularly to gas wiping for adjusting the amount of coating deposited on the surface of the steel strip.
Background
In the continuous hot-metal plating line, as shown in fig. 4, a steel strip P annealed in a continuous annealing furnace in a reducing atmosphere is continuously introduced into a molten metal bath 14 in a plating tank 12 through a snout 10. Then, the steel strip P is lifted up above the molten metal bath 14 via the sink roll 16 and the backup roll 18 in the molten metal bath 14, adjusted to a predetermined coating thickness by the gas wiping nozzles 20A and 20B, cooled, and introduced to the subsequent step. The gas wiping nozzles 20A and 20B are arranged above the plating tank 12 so as to face each other with the steel strip P interposed therebetween, and blow gas from their injection ports to both surfaces of the steel strip P. By this gas wiping, excess molten metal is scraped off, the amount of plating deposited on the surface of the steel strip is adjusted, and the molten metal deposited on the surface of the steel strip is made uniform in the width direction and the length direction of the steel strip. The gas wiping nozzles 20A and 20B are generally configured to be longer than the steel strip width and extend to the outside of the ends in the width direction of the steel strip, because they correspond to various steel strip widths and positional shifts in the width direction when the steel strip is lifted up.
Such a gas wiping system has the following problems: the molten metal falls and scatters below the steel strip due to the turbulence of the gas jet that collides with the steel strip, so-called splashes are generated, and adhere to the surface of the steel strip, thereby degrading the surface quality of the coated steel strip. The problem of the generation of the spatters becomes more remarkable when the pressure of the gas blown from the gas wiping nozzle onto the surface of the steel strip (hereinafter, simply referred to as "gas pressure") is increased. In addition, there are also problems as follows: the scattered spatters fall into the plating tank to form top dross (top dross), which causes a reduction in the surface quality of the plated steel strip and requires an operator to remove the top dross.
In the continuous production process of a steel strip, the strip passing speed (line speed) may be increased in order to increase the production amount. However, when the amount of deposit of the plating layer is adjusted by the gas wiping method in the continuous hot-dip plating process, if the line speed is increased, the initial amount of deposit of the steel strip immediately after passing through the plating bath increases due to the viscosity of the molten metal. Therefore, in order to adjust the amount of deposit to a certain range, the gas pressure needs to be set to a higher pressure, and the amount of spatter increases significantly.
In addition, in the case where the amount of deposit of the plating layer is to be reduced, it is also effective to increase the gas pressure, but in this case, the amount of spatter is also greatly increased.
In order to solve the problem of the generation of the spatters, a technique has been proposed in which the wiping performance is improved by increasing the temperature of the gas blown from the gas wiping nozzle onto the surface of the steel strip. Patent document 1 describes a method for producing a hot-dip coated metal steel strip, in which a gas wiping composed of a main nozzle and a pair of sub-nozzles provided above and below the main nozzle is used to set the temperature of the gas ejected from the sub-nozzles to a temperature of 500 ℃ or lower and 50 ℃ or higher than the temperature of the gas ejected from the main nozzle. Patent document 2 describes a method for controlling the amount of hot-dip coating adhesion, in which a gas containing a combustion gas generated by combustion in a wiping nozzle is blown so that the gas temperature at the outlet of the wiping nozzle is 300 ℃.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2009-203500
Patent document 2: japanese laid-open patent publication No. 2009-263698
Disclosure of Invention
Problems to be solved by the invention
If the wiping ability is improved by the techniques of patent documents 1 and 2, it is not necessary to increase the gas pressure accordingly, and therefore, it is possible to contribute to the reduction of spatters. However, in both patent documents 1 and 2, the gas temperature Ty at the outlet of the gas wiping nozzle is defined, and the present inventors have recognized the following problems that occur in this case. That is, the gas ejected from the gas wiping nozzle is mixed with the ambient air and the temperature gradually decreases. Therefore, when 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 み) is reduced to near normal temperature, and the effect of heating the gas is lost. The amount of temperature reduction of the gas depends not only on the nozzle-strip distance but also on conditions such as gas pressure and nozzle angle, and these operating conditions may vary depending on the product. Therefore, even if the gas temperature Ty at the nozzle outlet is set to a predetermined temperature, the gas temperature at the stagnation point differs depending on the operation conditions, and as a result, the amount of spatter generated and the amount of top dross generated differ. In addition, even if the gas temperature Ty at the nozzle outlet is set to a predetermined temperature, it is very difficult to predict the gas temperature T at the stagnation point with high accuracy.
In view of the above problems, it is an object of the present invention to provide an apparatus and a method for producing a hot-dip coated metal steel strip, which can stably produce a high-quality hot-dip coated metal steel strip by suppressing the generation of surface defects of a coating layer due to splashes and top dross even when operating conditions are variously changed.
Means for solving the problems
In order to solve the above problems, the present inventors have considered that it is necessary to predict the gas temperature T at the stagnation point with high accuracy and control it within a preferred predetermined temperature range in a manufacturing apparatus and a manufacturing method of a hot-dip coated metal steel strip in which the amount of deposit is adjusted by using a gas wiping nozzle. Therefore, it is conceivable to dispose a baffle plate on the steel strip extension surface in the vicinity of the end portion in the width direction of the steel strip and dispose a temperature sensor thereon. 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 predicted in situ (in-situ) with high accuracy. It has been found that the above-mentioned problems can be solved by performing feedback control of the temperature of the injected gas (i.e., the gas temperature measured immediately after the gas heating device) based on the measured temperature T 'to control the gas temperature T at the stagnation point (strictly, the temperature T' measured by the temperature sensor) within a preferable predetermined temperature range.
The present invention has been completed based on the above findings, and the gist thereof is as follows.
(1) An apparatus for manufacturing a hot-dip coated metal steel strip, comprising:
a pair of gas wiping nozzles arranged to face each other with a steel strip continuously lifted up from a molten metal bath interposed therebetween, and configured to blow a gas from an outlet to the steel strip to adjust the amount of plating deposited on both surfaces of the steel strip;
a supply mechanism for supplying the gas to the gas wiping nozzle;
a gas temperature adjusting mechanism capable of changing the temperature of the gas supplied from the supply mechanism to the gas wiping nozzle;
a baffle plate disposed on the steel strip extending surface near the end in the width direction of the steel strip to avoid collision between the gases ejected from the pair of gas wiping nozzles;
a temperature sensor provided on at least one surface of the baffle plate; and
and a control unit for controlling the gas temperature adjustment mechanism based on an output of the temperature sensor.
(2) The apparatus for producing a hot-dip coated metal steel strip as set forth in (1) above, wherein the control unit controls the gas temperature adjustment mechanism to change the temperature of the gas supplied to the gas wiping nozzle so that the temperature measured by the temperature sensor falls within a predetermined range when the temperature measured by the temperature sensor deviates from the predetermined range.
(3) The apparatus for producing a hot-dip coated metal steel strip according to the item (1) or (2), wherein a shortest distance between the baffle plate and the end portion in the width direction of the steel strip is 1mm or more and less than 10 mm.
(4) The apparatus for producing a hot-dip coated metal steel strip as claimed in any one of the above (1) to (3), wherein a movable mechanism is provided for varying the height of the baffle from the bath surface of the molten metal bath.
(5) The apparatus for producing a hot-dip coated metal steel strip as claimed in any one of the above (1) to (4), wherein the baffle plate has a thermal conductivity of 1 W.m-1·K-1The following materials.
(6) The apparatus for producing a hot-dip coated metal steel strip as claimed in any one of the above (1) to (5), wherein a heat insulating material is disposed between the baffle plate and the temperature sensor.
(7) A method for producing a hot-dip coated metal steel strip using the apparatus for producing a hot-dip coated metal steel strip according to any one of the above (1) to (6),
the temperature of the gas supplied to the gas wiping nozzles is controlled based on the output of the temperature sensor, and the gas is blown from the pair of gas wiping nozzles onto the steel strip continuously lifted up from the molten metal bath, thereby adjusting the amount of plating deposited on both surfaces of the steel strip.
Effects of the invention
The apparatus and method for manufacturing a hot-dip coated metal steel strip according to the present invention can stably manufacture a high-quality hot-dip coated metal steel strip by suppressing the generation of surface defects of a coating layer due to splashes and top dross even when operating conditions are variously changed.
Drawings
Fig. 1 is a schematic diagram showing a configuration of an apparatus 100 for producing a hot-dip coated metal steel strip according to an embodiment of the present invention.
Fig. 2 is a perspective view showing a structure in the vicinity of an end in the width direction of the steel strip P in the manufacturing apparatus 100 shown in fig. 1.
Fig. 3 is an enlarged view of the baffle 26 and the tip end portion of the gas wiping nozzle 20A in the manufacturing apparatus 100 shown in fig. 1.
FIG. 4 is a schematic view showing the structure of a conventional apparatus for producing a hot-dip metallized steel strip.
Fig. 5 is a graph showing the spatter generating rate and the standard deviation thereof in the comparative example and the inventive example.
Fig. 6 is a graph showing the amount of top dross generation and the standard deviation thereof in the comparative example and the inventive example.
Detailed Description
An apparatus 100 for producing a hot-dip coated metal steel strip (hereinafter, also simply referred to as "production apparatus") and a production method according to an embodiment of the present invention will be described with reference to fig. 1 to 3.
Referring to fig. 1, a manufacturing apparatus 100 of the present embodiment has a furnace nose 10, a plating tank 12, a sink roll 16, and a backup roll 18. The snout 10 is a member having a rectangular cross section perpendicular to the steel strip traveling direction and dividing the space through which the steel strip P passes, and the tip thereof is immersed in a molten metal bath 14 formed in a plating tank 12. In one embodiment, the steel strip P annealed in the continuous annealing furnace in a reducing atmosphere is continuously introduced into the molten metal bath 14 in the plating tank 12 through the inside of the snout 10. Then, the steel strip P is lifted up above the molten metal bath 14 via the sink roll 16 and the backup roll 18 in the molten metal bath 14, adjusted to a predetermined plating thickness by the pair of gas wiping nozzles 20A and 20B, cooled, and introduced to the subsequent step.
The pair of gas wiping nozzles 20A and 20B (hereinafter, also simply referred to as "nozzles") are arranged to face each other above the plating tank 12 with the steel strip P interposed therebetween. Referring to fig. 3, the nozzle 20A blows gas from its outlet (jet port 34) toward the steel strip P to adjust the amount of deposit on the surface of the steel strip. Similarly, the other nozzle 20B scrapes off the excess molten metal by the pair of nozzles 20A and 20B, and the amount of deposit on both surfaces of the steel strip P is adjusted so as to be uniform in the width direction and the longitudinal direction of the steel strip P.
As shown in fig. 2, the nozzles 20A and 20B are generally configured to be longer than the strip width and extend to the outside of the ends in the width direction of the strip, because they correspond to various strip widths and also to positional shifts in the width direction when the strip is lifted. As shown in fig. 3, the nozzle 20A includes an upper nozzle member 32A and a lower nozzle member 32B, and a gas ejection port 34 (nozzle slit) is formed between the tips of the upper and lower nozzle members 32A and 32B. The jet ports 34 extend in the width direction of the steel strip. The longitudinal cross-sectional shape of the nozzle 20A is a tapered shape that tapers toward the tip. The thickness of the tip portions of the upper and lower nozzle members 32A, 32B may be set to about 1mm to about 3 mm. The opening width (slit interval) of the ejection port is not particularly limited, and may be set to about 0.5mm to about 2.5 mm. The gas supplied from the gas supply mechanism 22 described later is injected from the injection port 34 through a gas passage defined by the upper and lower nozzle members 32A and 32B, and is blown onto the surface of the steel strip P. The other nozzle 20B has the same configuration.
Next, the gas supply mechanism 22 and the gas temperature adjustment mechanism 24 will be described. The gas supply mechanism 22 supplies gas to the nozzles 20A and 20B. The gas temperature adjustment mechanism 24 has a function of changing the temperature of the gas supplied from the supply mechanism 22 to the nozzles 20A and 20B. In one embodiment, the gas supply mechanism 22 includes a pipe through which a gas at normal temperature passes and a blower that pressurizes the gas to a predetermined pressure, and the gas temperature adjustment 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 supply of the gas and the adjustment of the gas temperature are not limited to the above examples as long as the gas temperature can be changed without delay. For example, a method of mixing combustion exhaust gas of an annealing furnace with air may be used. In this case, air is pressurized to a predetermined pressure by a blower, and then the air is mixed with the combustion exhaust gas to produce a mixed gas, and the mixed gas is supplied to the nozzles 20A and 20B. The gas temperature is adjusted by changing the mixing ratio of the combustion exhaust gas. That is, in the case of increasing the gas temperature, the ratio of the combustion exhaust gas is increased. In this case, the gas supply mechanism 22 includes a pipe through which air at normal temperature passes and a blower that pressurizes the air to a predetermined pressure, and the gas temperature adjustment mechanism 24 includes a mechanism that changes a mixing ratio of the combustion exhaust gas and the air.
Referring to fig. 2, in the present embodiment, the baffle 26 is disposed on the strip extension surface in the vicinity of the end portion in the width direction of the strip P. The baffle 26 is disposed between the pair of nozzles 20A and 20B, and helps reduce spatters by avoiding collision between the gases ejected from the pair of nozzles 20A and 20B. In fig. 2, the baffle 26 disposed in the vicinity of one end in the width direction of the steel strip P is illustrated, but in the present embodiment, baffles are disposed in the vicinity of both ends in the width direction of the steel strip, and this embodiment is preferable from the viewpoint of avoiding collision of gas.
The shape of the baffle 26 is not particularly limited, but is preferably rectangular as shown in fig. 2, and two sides thereof are preferably arranged parallel to the extending direction of the widthwise end of the steel strip P. The thickness of the baffle 26 is appropriately determined from the viewpoint of ensuring rigidity such as preventing the baffle from vibrating due to collision of gas, and may be set to be in the range of 4 to 10mm, for example.
The closer the baffle 26 is to the steel strip P, the more the spatter preventing performance is improved. From this viewpoint, the shortest distance D1 between the flapper 26 and the widthwise end of the steel strip P greatly affects the spatter preventing performance, and is preferably set to 1mm or more and less than 10 mm. When D1 is 10mm or more, scattering of spatters becomes rapidly remarkable. When D1 is less than 1mm, there is a possibility that the baffle may contact the steel strip. The baffle 26 extends outward of the end portions of the nozzles 20A and 20B in the steel strip width direction.
Referring to fig. 1 and 2, in the present embodiment, temperature sensors 28A, 28B are provided on both surfaces of the baffle 26. Temperature sensors are also provided on both surfaces of the other baffle, not shown. The form of the temperature sensor is not particularly limited, and for example, a contact thermometer such as a thermocouple may be used. The temperature T' of the gas blown onto each temperature sensor can be continuously measured by each 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 predicted in situ (in-situ) with high accuracy. Each temperature sensor outputs information of the gas temperature T' obtained by continuous measurement to the control unit 30.
The control unit 30 receives input of information on the gas temperature T' output from each temperature sensor, and controls the gas temperature adjustment mechanism 24. That is, the temperature of the injected gas is feedback-controlled based on the measured temperature T ', so that the gas temperature T at the stagnation point (strictly, the temperature T' measured by the temperature sensor) is controlled within a preferable predetermined temperature range. The form of the control unit 30 is not particularly limited, and may be realized by a Central Processing Unit (CPU) in a computer, for example.
Specifically, the control unit 30 controls the gas temperature adjustment mechanism 24 in the following manner based on the information of the measured temperature T' sent from the temperature sensor, and performs feedback control of the temperature of the injected gas.
First, in the control, the average (for example, arithmetic average) of 4 measured temperatures sent from 4 temperature sensors in total is used as the measured temperature T'.
In the present embodiment, it is important to control the gas temperature T at the stagnation point (i.e., the measured temperature T') within a preferred temperature range from the viewpoint of suppressing the spatters and the top dross. The preferred temperature range is set to the melting point of the molten metal bath. + -. 100 ℃. In the case of manufacturing a hot-dip galvanized steel strip, the gas temperature T at the stagnation point (i.e., the measured temperature T') is controlled to be in the range of 420 ℃ ± 100 ℃, i.e., in the range of 320 ℃ to 520 ℃ as the melting point of zinc.
Therefore, as a first example of the control, the following control can be cited: in order to keep the measurement temperature T 'always close to a predetermined temperature (for example, a central value) in the above-described preferred temperature range, the gas temperature is increased when the measurement temperature T' is lower than the central value, the gas temperature is not changed when the measurement temperature T 'is the central value, and the gas temperature is decreased when the measurement temperature T' is higher than the central value.
As a second example of the control, the following control may be mentioned: the change in the gas temperature is not performed when the measured temperature T' falls within the above-described preferred temperature range, and is performed only in the case of deviating from the predetermined temperature range. Specifically, the gas temperature is increased when the measured temperature T 'is lower than the lower limit of the preferred temperature range, and the gas temperature is decreased when the measured temperature T' exceeds the upper limit of the preferred temperature range. In this way, the temperature measured by the temperature sensor is made to fall within the above-described preferred temperature range.
The interval at which the feedback control is performed is not particularly limited. For example, the gas temperature may be measured by a temperature sensor continuously at all times during the operation, and information on the measured temperature may be transmitted to the control unit continuously at all times to perform feedback control. Alternatively, the gas temperature may be intermittently measured, and information on the measured temperature may be transmitted to the control unit to intermittently perform feedback control. The former is preferable from the viewpoint of more accurately managing the gas temperature T at the stagnation point.
As described in detail above, the temperature of the gas supplied to the gas wiping nozzles (i.e., the gas temperature measured immediately after the exit from the gas heating device) is controlled based on the output of the temperature sensor, and the gas is blown from the pair of nozzles 20A and 20B to the steel strip P continuously lifted up from the molten metal bath 14, thereby adjusting the amount of plating deposited on both surfaces of the steel strip P. This makes it possible to predict the gas temperature T at the stagnation point with high accuracy, and to maintain and manage the gas temperature T within a preferable predetermined temperature range at all times. Therefore, the generation of surface defects of the plated layer due to the spatters and the top dross can be suppressed, and a high-quality hot-dip coated metal steel strip can be stably manufactured, and the same effect can be obtained even when the operating conditions are variously changed.
In the above embodiment, an example in which a total of 4 temperature sensors arranged on both surfaces of two shutters are used is shown, but the number of temperature sensors may be any of 1, 2, and 3. In the case of 1 shutter, 1 temperature sensor may be provided on one surface thereof, or 1 temperature sensor or 2 temperature sensors may be provided on both surfaces thereof. In the case of using a plurality of temperature sensors, the average (for example, arithmetic average) of the measured temperatures of the respective temperature sensors is used as the measured temperature T'.
The manufacturing apparatus 100 of the present embodiment preferably includes a movable mechanism for varying the height of the baffle 26 from the bath surface of the molten metal bath so that the vertical position of the baffle 26 moves up and down in accordance with the height of the nozzles 20A and 20B. Thus, even if the height of the nozzle is changed, the gas temperature can be measured by the maximum collision pressure of the gas against the steel strip P at all times, and therefore, the temperature of the injected gas can be controlled with high accuracy. Specifically, the flapper 26 is fixed to a holder (not shown) of the wiping nozzle. As the movable mechanism, an air compressor may be used as an example.
Further, an edge sensor for measuring the distance D1 from the steel strip is preferably attached to the upper part of the baffle plate. The baffle 26 is positioned so as to reach the target distance D1 by moving the baffle in the steel strip width direction while measuring the distance to the steel strip by the edge sensor.
In the present embodiment, a heat insulating material (not shown) is preferably disposed between the baffle 26 and the temperature sensors 28A and 28B. This is to prevent heat from being transferred from the baffle to the temperature sensor, which makes it impossible to accurately measure the gas temperature. The kind of the heat insulating material is not particularly limited, and examples thereof include glass wool and cellulose fiber.
In addition, the same effect can be obtained by using a material having low thermal conductivity as the material of the baffle 26 instead of or in addition to the heat insulating material. From this viewpoint, the baffle plate preferably has a thermal conductivity of 1 W.m-1·K-1The following materials. For example, the material having low thermal conductivity may be a ceramic such as alumina or silicon carbide, but is not particularly limited thereto.
Referring to FIG. 3, the distance D2 between the nozzle tip and the surface of the steel strip is preferably set to a range of 3 to 40 mm. When D2 is 3mm or more, nozzle clogging due to spatter is less likely to occur, and when D2 is 40mm or less, the gas pressure for achieving the target deposition amount can be reduced, and as a result, the amount of heating of the gas can be reduced.
Referring to fig. 3, the distance H in the vertical direction between the center of the ejection opening 34 of the nozzle and the center of the temperature sensor 28 is preferably set to be in the range of 0 to 5 mm. When H is 5mm or less, the temperature T' of the gas blown onto the temperature sensor can be measured more accurately.
The hot-dip metal coated steel strip produced by the production apparatus and the production method of the present invention includes a hot-dip galvanized steel sheet including any of a plated steel sheet (GI) which is not subjected to alloying treatment after the hot-dip galvanizing treatment and a plated steel sheet (GA) which is subjected to alloying treatment.
Examples
In a hot dip galvanized steel strip production line, a hot dip galvanized steel strip production test was performed. In invention examples 1 to 5, the manufacturing apparatus shown in FIGS. 1 to 3 was usedIn the comparative example, the production apparatus shown in FIG. 4 was used, and a gas wiping nozzle was used, which had a slit interval of 1.2mm, a gas ejection direction was set at right angles to the surface of the steel strip, nozzle heights from the hot dip galvanizing bath surface were set to various heights in the range of 250 to 400mm, a distance D2 from the nozzle tip to the surface of the steel strip was set to various distances in the range of 0 to 25mm, the steel strip having a thickness of 0.8mm × and a width of 1000mm was passed through the steel strip at various speeds in the range of 120 to 180 m/min, and a gas pressure was set to various pressures in the range of 50 to 100kPa, and experiments were carried out under 10 kinds of total operating conditions, and under any operating conditions, the amount of the plating layer adhesion was set to about 50g/m2The linear velocity, gas pressure and distance D2 are set in a manner of constant values.
The method of supplying gas to the nozzle and the method of adjusting the gas temperature are methods of supplying gas in which normal temperature gas is heated to a predetermined temperature by a heat exchanger and pressurized to a predetermined pressure by a blower.
In the comparative example, the experiment was performed without the baffle, with a temperature sensor provided at the nozzle outlet, and controlled so as to maintain the nozzle outlet temperature Ty within the range of 320 to 520 ℃.
In the invention examples 1 to 5, 1 baffle plate or 2 baffle plates were disposed in total in the vicinity of both ends in the width direction of the steel strip. At the center of both surfaces, 1 temperature sensor (sheath K thermocouple) was disposed, for a total of 4 temperature sensors. The size of the baffle was set to 50mm in height (dimension in the steel strip traveling direction), 200mm in width (dimension in the steel strip width direction) and 5mm in thickness. The distance D1 between the baffle and the end in the width direction of the steel strip was set to 10mm in invention example 1 and 5mm in invention examples 2 to 5. The gas temperature T at the stagnation point is predicted based on the measured temperature obtained by the temperature sensor, and the temperature of the injected gas is feedback-controlled. Specifically, the arithmetic mean of 4 measured temperatures sent from 4 temperature sensors in total is used as the measured temperature T'. When the measurement temperature T ' falls within the range of 320-520 ℃, the gas temperature is not changed, and when the measurement temperature T ' is lower than 320 ℃, the gas temperature is increased, and when the measurement temperature T ' exceeds 520 ℃, the gas temperature is decreased. The above control is continuously performed during the operation.
In invention examples 1 and 2, the baffle was made of SUS304 (thermal conductivity 17 W.m)-1·K-1). In invention example 3, glass wool was disposed as a heat insulating material between the SUS304 baffle and the temperature sensor. In invention example 4, the baffle plate was made of alumina having low thermal conductivity (thermal conductivity 0.20W · m)-1·K-1) Glass wool is arranged between the baffle plate and the temperature sensor as a heat insulating material. In invention example 5, the baffle was made of alumina having low thermal conductivity, glass wool was disposed between the baffle and the temperature sensor as a heat insulating material, and a movable mechanism for changing the height of the baffle from the bath surface was further employed.
In each of the invention examples and comparative examples, the spatter generation rate and the top dross generation amount were evaluated. The spatter generation rate is set to a ratio of the length of the steel strip judged to have spatter defects in the inspection step to the length of the steel strip passing under each manufacturing condition, and includes light spatter defects that do not become a practical problem. The top dross generation amount was measured by taking up the top dross floating on the bath surface after 1 hour of passing through the plate with a spoon. The hot dip galvanizing bath temperature in the experiment was 460 ℃.
The spatter generating rates under the respective conditions are shown in fig. 5. In fig. 5, the average of the spatter generation rates under 10 operation conditions in the comparative example is set to 100, and the average of the spatter generation rates under 10 operation conditions in each invention example is normalized and expressed. In addition, the standard deviation of the spatter generating rate in the comparative example and each inventive example is also shown. In addition, the top dross generation amount and the standard deviation under each condition are shown in fig. 6.
In the invention example 1, the spatter generating rate was decreased as compared with the comparative example. In addition, the standard deviation σ is also reduced from 0.26 to 0.088, and the spatter generating rate can be stably reduced under various operating conditions. In addition, the amount of top dross generation was also reduced in inventive example 1 as compared with the comparative example.
In the invention example 2, the spatter generation rate and the standard deviation thereof and the top dross generation amount were further reduced as compared with the invention example 1. This is considered to be because the distance D1 was shortened as compared with invention example 1, and therefore the spatter preventing effect was further improved.
The invention examples 3 and 4 can further reduce the amount of spatter generated, the standard deviation thereof, and the amount of top dross generated, as compared with the invention example 1. This is considered to be because the temperature T' of the gas blown onto the temperature sensor can be measured with high accuracy.
In the invention example 5, the amount of spatter generated, the standard deviation thereof, and the amount of top dross generated can be further reduced as compared with the invention examples 3 and 4. This is considered to be because the temperature T' of the gas blown onto the temperature sensor can be measured with high accuracy by moving the baffle up and down in addition to the effect of the heat insulating material.
Industrial applicability
The invention provides a device and a method for manufacturing a hot-dip coated metal steel strip, which can restrain the generation of coating surface defects caused by splashes and top dross even if the operation conditions are changed, thereby stably manufacturing the high-quality hot-dip coated metal steel strip.
Description of the symbols
Apparatus for manufacturing 100 hot-dip metal coated steel strip
10 furnace nose
12 plating bath
14 bath of molten metal
16 sink roll
18 support roller
20A, 20B gas wiping nozzle
22 gas supply mechanism
24 gas temperature adjusting mechanism
26 baffle
28A, 28B temperature sensor
30 control part
32A upper nozzle member
32B lower nozzle member
34 jet orifice (outlet)
P steel belt
Claims (8)
1. An apparatus for manufacturing a hot-dip coated metal steel strip, comprising:
a pair of gas wiping nozzles arranged to face each other with a steel strip continuously lifted up from a molten metal bath interposed therebetween, and configured to blow a gas from an outlet to the steel strip to adjust the amount of plating deposited on both surfaces of the steel strip;
a supply mechanism for supplying the gas to the gas wiping nozzle;
a gas temperature adjusting mechanism capable of changing the temperature of the gas supplied from the supply mechanism to the gas wiping nozzle;
a baffle plate disposed on an extended surface of the steel strip near an end portion in the width direction of the steel strip to avoid collision between the gases ejected from the pair of gas wiping nozzles;
a temperature sensor disposed on at least one side of the baffle; and
a control unit for controlling the gas temperature adjustment mechanism based on an output of the temperature sensor.
2. The apparatus for manufacturing a hot-dip coated metal steel strip as claimed in claim 1, wherein the control unit controls the gas temperature adjustment mechanism to change the temperature of the gas supplied to the gas wiping nozzle so that the temperature measured by the temperature sensor falls within a predetermined range when the temperature measured by the temperature sensor deviates from the predetermined range.
3. The apparatus for producing a hot-dip coated metal steel strip as claimed in claim 2, wherein the predetermined range is a range of a melting point of the molten metal bath ± 100 ℃.
4. The apparatus for producing a hot-dip coated metal steel strip as claimed in any one of claims 1 to 3, wherein the shortest distance between the baffle plate and the end in the width direction of the steel strip is 1mm or more and less than 10 mm.
5. The apparatus for producing a hot-dip coated metal steel strip as claimed in any one of claims 1 to 3, wherein a movable mechanism is provided for varying the height of the baffle plate from the bath surface of the molten metal bath.
6. The apparatus for producing the hot-dip coated metal steel strip as claimed in any one of claims 1 to 3, wherein the baffle plate is made of a material having a thermal conductivity of 1W-m-1·K-1The following materials.
7. The apparatus for producing the hot-dip coated metal steel strip as claimed in any one of claims 1 to 3, wherein a heat insulating material is disposed between the baffle plate and the temperature sensor.
8. A method for producing a hot-dip coated metal steel strip using the apparatus for producing a hot-dip coated metal steel strip according to any one of claims 1 to 7,
the temperature of the gas supplied to the gas wiping nozzles is controlled based on the output of the temperature sensor, and the gas is blown from the pair of gas wiping nozzles onto the steel strip continuously lifted up from the molten metal bath, thereby adjusting the amount of plating deposited on both surfaces of the steel strip.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-086079 | 2015-04-20 | ||
| JP2015086079A JP6044669B2 (en) | 2015-04-20 | 2015-04-20 | Manufacturing apparatus and manufacturing method for molten metal plated steel strip |
| PCT/JP2016/002007 WO2016170757A1 (en) | 2015-04-20 | 2016-04-13 | Production apparatus and production method for molten metal plated steel strip |
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| CN107532271A CN107532271A (en) | 2018-01-02 |
| CN107532271B true CN107532271B (en) | 2020-09-22 |
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| CN201680022555.3A Active CN107532271B (en) | 2015-04-20 | 2016-04-13 | Apparatus and method for manufacturing hot-dip metal coated steel strip |
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| Country | Link |
|---|---|
| EP (1) | EP3287541B1 (en) |
| JP (1) | JP6044669B2 (en) |
| CN (1) | CN107532271B (en) |
| AU (1) | AU2016252193B2 (en) |
| MX (1) | MX2017013462A (en) |
| WO (1) | WO2016170757A1 (en) |
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| JP6697418B2 (en) * | 2017-05-31 | 2020-05-20 | Ｊｆｅスチール株式会社 | High temperature gas wiping device |
| CN112513313B (en) * | 2018-08-22 | 2023-03-21 | 杰富意钢铁株式会社 | Method for producing molten metal coated steel strip and continuous molten metal coating apparatus |
| MX2021002036A (en) * | 2018-08-22 | 2021-04-28 | Jfe Steel Corp | Method for manufacturing hot-dip metal plated steel strip, and continuous hot-dip metal plating facility. |
| CN109777979B (en) * | 2019-02-19 | 2020-10-30 | 中南大学 | Method for regulating and controlling cross section structure uniformity of ultra-wide aluminum alloy plate |
| CN112481573B (en) * | 2020-12-18 | 2023-02-17 | 江阴市华达机械科技有限公司 | Air knife edge baffle plate assembly |
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| JPH09195023A (en) * | 1996-01-11 | 1997-07-29 | Sumitomo Metal Ind Ltd | Gap variable type gas wiping nozzle device |
| JP2005256050A (en) * | 2004-03-10 | 2005-09-22 | Nisshin Steel Co Ltd | Method and apparatus for adjusting surface appearance of hot-dipped steel sheet |
| CN101443471A (en) * | 2006-05-12 | 2009-05-27 | 杰富意钢铁株式会社 | Method for manufacturing molten-metal plated steel band |
| CN101796209A (en) * | 2007-09-05 | 2010-08-04 | 杰富意钢铁株式会社 | Apparatus for manufacturing hot-dip metal plated steel band |
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| CN102985580A (en) * | 2010-07-13 | 2013-03-20 | 钢铁普蓝特克股份有限公司 | Baffle plate unit and gas wiping device using same |
-
2015
- 2015-04-20 JP JP2015086079A patent/JP6044669B2/en active Active
-
2016
- 2016-04-13 MX MX2017013462A patent/MX2017013462A/en active IP Right Grant
- 2016-04-13 EP EP16782783.1A patent/EP3287541B1/en active Active
- 2016-04-13 WO PCT/JP2016/002007 patent/WO2016170757A1/en active Application Filing
- 2016-04-13 AU AU2016252193A patent/AU2016252193B2/en active Active
- 2016-04-13 CN CN201680022555.3A patent/CN107532271B/en active Active
Patent Citations (8)
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|---|---|---|---|---|
| JPH06116698A (en) * | 1992-10-06 | 1994-04-26 | Sumitomo Metal Ind Ltd | Continuous hot-dip metal plating device of steel sheet |
| JPH06172955A (en) * | 1992-12-01 | 1994-06-21 | Sumitomo Metal Ind Ltd | Plating thickness control device and method for hot-dip coated metallic sheet |
| JPH09195023A (en) * | 1996-01-11 | 1997-07-29 | Sumitomo Metal Ind Ltd | Gap variable type gas wiping nozzle device |
| JP2005256050A (en) * | 2004-03-10 | 2005-09-22 | Nisshin Steel Co Ltd | Method and apparatus for adjusting surface appearance of hot-dipped steel sheet |
| CN101443471A (en) * | 2006-05-12 | 2009-05-27 | 杰富意钢铁株式会社 | Method for manufacturing molten-metal plated steel band |
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| CN101821420A (en) * | 2007-10-09 | 2010-09-01 | 杰富意钢铁株式会社 | Apparatus for producing molten metal plated steel strip and process for producing molten metal plated steel strip |
| CN102985580A (en) * | 2010-07-13 | 2013-03-20 | 钢铁普蓝特克股份有限公司 | Baffle plate unit and gas wiping device using same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107532271A (en) | 2018-01-02 |
| JP2016204694A (en) | 2016-12-08 |
| EP3287541B1 (en) | 2019-07-24 |
| EP3287541A4 (en) | 2018-04-04 |
| AU2016252193A1 (en) | 2017-10-26 |
| AU2016252193B2 (en) | 2018-10-18 |
| MX2017013462A (en) | 2017-12-07 |
| JP6044669B2 (en) | 2016-12-14 |
| WO2016170757A1 (en) | 2016-10-27 |
| EP3287541A1 (en) | 2018-02-28 |
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