WO2016056178A1 - Continuous hot-dip metal plating method, hot-dip zinc-plated steel strip, and continuous hot-dip metal plating equipment - Google Patents
Continuous hot-dip metal plating method, hot-dip zinc-plated steel strip, and continuous hot-dip metal plating equipment Download PDFInfo
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- WO2016056178A1 WO2016056178A1 PCT/JP2015/004715 JP2015004715W WO2016056178A1 WO 2016056178 A1 WO2016056178 A1 WO 2016056178A1 JP 2015004715 W JP2015004715 W JP 2015004715W WO 2016056178 A1 WO2016056178 A1 WO 2016056178A1
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- molten metal
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- metal plating
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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
- C23C2/04—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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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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
- C23C2/14—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
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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
- C23C2/50—Controlling or regulating the coating processes
- C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing
Definitions
- the present invention relates to a continuous molten metal plating method, a hot dip galvanized steel strip, and a continuous molten metal plating facility.
- the steel strip 1 enters the molten metal 4 in the plating tank 3 from the inside of the snout 2, is turned by the sink roll 5, and is pulled up from the plating tank 3.
- excess molten metal is scraped off by the gas wiping nozzle 6 installed above the plating tank 3 and controlled to a predetermined plating adhesion amount, and the molten metal attached to the surface of the steel strip 1 Uniform in the longitudinal direction of the plate.
- the gas wiping nozzle 6 is usually configured to be longer than the steel strip width in order to cope with various steel strip widths and to cope with positional deviation in the width direction when the steel strip is pulled up. It extends to the outside from the width end.
- corrugated flow-shaped hot water wrinkles are generated on the plating surface due to the minute vibration of the steel strip caused by the wiping gas spraying and irregular hot water flow in the plating layer. Often to do. Plated steel sheets with such hot water wrinkles should be suitable for coating processes with excellent appearance when the surface of the coating, especially the smoothness, is obstructed when the plating surface is used as the coating base surface in the application of exterior panels. It cannot be used for an exterior plate, and has a great influence on the yield of plated steel plates.
- the method disclosed in Patent Document 1 is a method for making hot wrinkles inconspicuous by changing the surface properties and rolling conditions of a temper rolling roll when performing temper rolling, which is a step after steel plate plating.
- the surface roughness of the steel sheet is adjusted according to the amount of plating applied using a skin pass mill, a tension leveler, etc. It is a method of suppressing the above.
- the method disclosed in Patent Document 3 is a method for suppressing generation of hot water wrinkles by setting an appropriate line speed with respect to the plate thickness and the height of the wiping nozzle from the bath surface.
- JP 2004-27263 A JP-A-55-21564 Japanese Patent Laid-Open No. 9-41113
- the method disclosed in Patent Document 1 improves minor hot water wrinkles, but has no effect on severe hot water wrinkle defects.
- the method disclosed in Patent Document 2 has a problem in terms of cost because it is necessary to install a skin pass mill, a tension leveler, etc. in the pre-process of the hot dip galvanizing bath.
- the ideal surface roughness is difficult to obtain due to chemical and physical changes accompanying pickling and recrystallization in pretreatment equipment and annealing furnaces, and completely prevents hot water wrinkles. It is considered difficult to do.
- the method shown in Patent Document 3 since the line speed and the wiping nozzle height cannot immediately follow the change point of the plate thickness, a steel plate in which hot water wrinkles is generated, which leads to yield loss. End up.
- the present invention has been made in view of the above circumstances, and in a continuous molten metal plating method in which the amount of plating adhesion is controlled using a gas wiping nozzle, the occurrence of hot metal wrinkle defects is suppressed, and high quality molten metal plating is performed. It is an object of the present invention to provide a continuous hot metal plating method, hot dip galvanized steel belt, and continuous hot metal plating equipment capable of stably producing a steel strip at a lower cost.
- the gist of the present invention is as follows. [1] A continuous molten metal in which a steel strip is continuously immersed in a molten metal plating bath, and gas is blown from a gas wiping nozzle to the steel strip immediately after being drawn out of the molten metal plating bath, thereby controlling the amount of plating adhered.
- the temperature of the wiping gas injected from the gas wiping nozzle according to a D / B value represented by a distance D between the gas wiping nozzle tip and the steel strip and a ratio of the gas wiping nozzle gap B A continuous molten metal plating method for controlling T.
- T Temperature of wiping gas injected from the gas wiping nozzle [° C.]
- T M Melting point of molten metal [° C.]
- D Distance between steel strip and gas wiping nozzle tip [m]
- B Gas wiping nozzle gap [m] c 1 , c 2 , c 3 : produced by the continuous molten metal plating method according to any one of constants [4] [1] to [3], Al: 1.0 to 10% by mass on the surface of the steel strip, A hot-dip galvanized steel strip having an Al—Zn-based plating layer containing Mg: 0.2 to 1.0 mass%, Ni: 0.005 to 0.10 mass%, and the balance being Zn and inevitable impurities.
- a continuous molten metal plating facility comprising: a control device that calculates a target temperature T of the wiping gas to be injected; and a gas heating device that raises the gas injected from the gas wiping nozzle to the target temperature T calculated by the control device.
- the target temperature T is calculated by the following equation (1) according to a D / B value represented by a ratio of the distance D measured by the distance meter and the gap B of the gas wiping nozzle.
- T Temperature of wiping gas injected from the gas wiping nozzle [° C.]
- T M Melting point of molten metal [° C.]
- D Distance between steel strip and gas wiping nozzle tip [m]
- B Gas wiping nozzle gap [m] c 1 , c 2 , c 3 : constant
- the present invention it is possible to stably produce a high-quality molten metal-plated steel strip at a lower cost by suppressing the occurrence of plating surface defects called hot water wrinkles.
- FIG. 1 is a schematic diagram of a production facility for a continuous molten metal-plated steel strip according to an embodiment of the present invention.
- FIG. 2 is an enlarged view of the tip of a gas wiping nozzle according to an embodiment of the present invention.
- FIG. 3 is a graph showing the presence / absence of hot water wrinkles in the relationship between the D / B value and the temperature T of the wiping gas.
- FIG. 4 is a schematic view of a conventional continuous hot-dip metal-plated steel strip production facility.
- the continuous molten metal plating facility of the present invention is a gas wiping nozzle that is pulled up from a plating bath after the steel strip is continuously immersed in a plating bath in a molten metal plating bath and then placed above the plating bath.
- This is a facility that adjusts the amount of plating metal adhesion by spraying wiping gas onto the plated steel strip.
- the continuous molten metal plating equipment of the present invention is a molten metal plating apparatus, a distance meter for measuring the distance between the steel strip and the gas wiping nozzle tip in a non-contact manner, a distance D measured by the distance meter, Based on the gap B of the gas wiping nozzle, a control device for calculating the target temperature T of the wiping gas injected from the gas wiping nozzle, and the gas injected from the gas wiping nozzle is increased to the target temperature T calculated by the control device. And a gas heating device for heating.
- FIG. 1 shows a continuous molten metal plating apparatus according to an embodiment of the present invention.
- 1 is a steel strip
- 2 is a snout
- 3 is a plating tank
- 4 is a molten metal
- 5 is a sink roll
- 6 is a gas wiping nozzle
- 7 is a distance meter
- 8 is a control unit (CU: Control Unit)
- 9 is a gas heating device.
- the arrow indicates the moving direction of the steel strip 1.
- the steel strip 1 enters the molten metal 4 in the plating tank 3 from within the snout 2, is changed in direction by the sink roll 5, and is pulled up from the plating tank 3. Next, excess molten metal is scraped off by the gas wiping nozzle 6 installed above the plating tank 3 and controlled to a predetermined adhesion amount.
- FIG. 2 is an enlarged view of the tip of the gas wiping nozzle 6.
- the distance between the tip of the gas wiping nozzle 6 and the steel strip 1 is represented by D.
- the gap of the gas wiping nozzle 6 is represented by B.
- the distance meter 7 is provided below the gas wiping nozzle 6, for example.
- the distance meter 7 continuously measures the distance D between the tip of the gas wiping nozzle 6 and the steel strip 1 and inputs the information to the control device 8.
- the control device 8 calculates the target temperature of the wiping gas heated by the gas heating device 9 based on the measurement information of the distance D sent from the distance meter 7.
- the gas heating device 9 has a function of raising the wiping gas to the target temperature calculated by the control device 8 and supplying the heated wiping gas to the gas wiping nozzle 6.
- the distance meter 7 may be of a non-contact type.
- the form of the control device 8 is not particularly limited.
- the type of the gas heating device 9 is not particularly limited as long as it has a function of raising the temperature of the wiping gas without delay according to the distance D between the gas wiping nozzle 6 and the steel strip 1. Further, the method for raising the temperature of the wiping gas supplied to the gas wiping nozzle 6 in the gas heating device 9 is not particularly limited. For example, a method of heating and raising the temperature with a heat exchanger and a method of mixing the combustion exhaust gas of the annealing furnace and air can be mentioned.
- the wiping injected from the gas wiping nozzle 6 according to the D / B value represented by the ratio of the distance D between the tip of the gas wiping nozzle 6 and the steel strip 1 and the gap B of the gas wiping nozzle 6.
- the temperature T of the gas is controlled.
- the fluidity of the molten metal is improved.
- the effect of preventing hot water wrinkle defects can be sufficiently exhibited.
- the wiping gas injected from the gas wiping nozzle 6 is preferably an inert gas.
- an inert gas By using an inert gas, oxidation of the molten metal on the surface of the steel sheet can be prevented, so that the fluidity of the molten metal can be further improved.
- the inert gas include, but are not limited to, nitrogen, argon, helium, carbon dioxide and the like.
- the wiping gas temperature is too low, hot water wrinkle defects will occur due to a decrease in fluidity of the molten metal. If the temperature of the wiping gas is too high, alloying is promoted and the appearance of the steel sheet is deteriorated. For this reason, it is necessary to select the optimum temperature T of the wiping gas according to the value of D / B. Therefore, in the present invention, the relationship between the D / B value and the temperature T of the wiping gas for obtaining a product having a good appearance free from hot water wrinkle defects was determined.
- the temperature of the hot dip galvanizing bath is 460 ° C
- the line speed is 100 m / min
- the pressure of the nozzle header is 30 kPa
- the gas type is air
- a steel strip with a plate thickness of 1.2 mm and a plate width of 1000 mm is passed through a continuous hot metal plating facility I let it plate.
- production state of hot water wrinkles were performed by the following criteria.
- Wa is a value of the arithmetic average waviness Wa [ ⁇ m] measured based on the standard of JIS B0601-2001.
- Fail Galvanized steel sheet (1.50 ⁇ Wa) where large hot water wrinkles can be confirmed visually
- Fail Galvanized steel sheet (1.00 ⁇ Wa ⁇ 1.50) in which small hot water wrinkles can be visually confirmed
- Pass Beautiful galvanized steel sheet in which hot water wrinkles cannot be visually confirmed (0.50 ⁇ Wa ⁇ 1.00) From the result of FIG. 3, it is preferable to control the temperature T of the wiping gas within the range represented by the following formula (1) according to the D / B value.
- T Temperature of wiping gas injected from the gas wiping nozzle [° C.]
- T M Melting point of molten metal [° C.]
- D Distance between steel strip and gas wiping nozzle tip [m]
- B Gas wiping nozzle gap [m] c 1 , c 2 , c 3 : Constants Note that the constants c 1 , c 2 , c 3 in the formula (1) vary depending on the size of the wiping nozzle gap B and the nozzle shape, and therefore need to be obtained offline in advance. .
- thermometer is set on the surface of the plate that looks like a steel strip, and the value of the thermometer is defined as “the temperature of the wiping gas at the collision position where the wiping gas collides with the steel strip”.
- the D / B value is changed for some conditions, the above temperature is measured, and the values of c1 to c3 are obtained. Further, when the D / B value exceeds 60, there is almost no wiping gas scraping force, so there is no point in heating the wiping gas. For this reason, the upper limit of the D / B value is preferably 60 or less.
- wiping gas to control the temperature of the wiping gas in the collision position to collide with the steel strip within the upper and lower 200 ° C. of the melting point T M of the molten metal ((T M ⁇ 100) °C ).
- T M melting point
- the temperature of the wiping gas at the collision position where the wiping gas collides with the steel strip is less than (T M -100) ° C, the solidification rate of the molten metal adhering to the steel plate becomes very high, and the fluidity of the molten metal As a result, the hot water wrinkle defect will occur.
- the temperature of the wiping gas on the heated side can be controlled by changing the temperature of the gas or liquid on the heating side.
- the optimum range of the wiping gas temperature T changes.
- the steel strip surface contains Al: 1.0 to 10% by mass, Mg: 0.2 to 1.0% by mass, Ni: 0.005 to 0.10% by mass, the balance being Zn and inevitable
- Mg which is easier to oxidize than Al or Zn
- Mg which is easier to oxidize than Al or Zn
- a hot-dip galvanized steel strip manufactured by using the gas wiping method of the present invention the surface of the steel strip is Al: 1.0-10 mass%, Mg: 0.2-1.0 mass%, Ni :
- the surface of the steel strip is Al: 1.0-10 mass%, Mg: 0.2-1.0 mass%, Ni :
- a steel strip having a thickness of 1.2 mm and a plate width of 1000 mm is passed at a line speed of 100 m / min, the composition of the plating layer, the distance D between the tip of the gas wiping nozzle and the steel strip, and the gas wiping nozzle
- the appearance of the steel sheet was evaluated by changing the gas pressure to be injected (nozzle header pressure), the gas set temperature, the gas type, and the coating adhesion amount.
- Mg 0.5 mass%
- Ni 0.05 mass%. It is.
- Wa is the value of the arithmetic average waviness Wa [ ⁇ m] measured based on the standard of JIS B0601-2001.
- Fail Galvanized steel sheet (1.50 ⁇ Wa) where large hot water wrinkles can be confirmed visually
- Fail Galvanized steel sheet (1.00 ⁇ Wa ⁇ 1.50) in which small hot water wrinkles can be visually confirmed
- Pass Beautiful galvanized steel sheet in which hot water wrinkles cannot be visually confirmed (0.50 ⁇ Wa ⁇ 1.00)
- A: Pass A very beautiful galvanized steel sheet (0 ⁇ Wa ⁇ 0.50) in which no hot water wrinkles can be visually confirmed. The results are shown in Table 1.
- Invention Example 1 can prevent hot water wrinkle defects by wiping at an optimum gas temperature corresponding to the D / B value.
- the reason why the hot water wrinkle defect could be prevented is that the temperature of the wiping gas at the collision position where the wiping gas collides with the steel strip in addition to the wiping performed at the optimum gas temperature corresponding to the D / B value (T It is considered that when the temperature is M ⁇ 100) ° C. or higher, the cooling effect by the jet gas is hindered, and the molten zinc adhering to the steel sheet is relatively solidified and can flow down regularly.
- Invention Example 2 D / B is changed, and wiping is performed at the optimum wiping gas temperature T according to the value, and as in Invention Example 1, hot water wrinkle defects can be prevented.
- Inventive Examples 3 to 8 show the results when the wiping temperature is changed for each D / B value.
- Comparative Example 1 and Comparative Example 2 show examples when the optimum gas temperature range derived from the D / B value is deviated.
- the reason why the adhesion amount increases in Comparative Example 1 is that the wiping gas ejected from the nozzle is mixed with the surrounding gas in addition to wiping at a temperature outside the optimum gas temperature range according to the D / B value. This is probably because the temperature of the wiping gas at the collision position of the steel strip fell below (T M -100) ° C.
- the temperature of the wiping gas was raised to a higher temperature than that of Invention Example 1, and the amount of adhesion increased. This is presumably because the wiping gas temperature was too high and the alloying of the galvanized steel layer surface was promoted. Moreover, due to the promotion of alloying, the surface of the steel sheet turned whitish and the appearance deteriorated.
- the results under other wiping conditions are shown in Comparative Examples 3 to 11.
- Invention Example 10 and Comparative Example 12 show examples in which the composition of the plating layer is changed. Since the melting point of the zinc bath was lowered to 375 ° C. by changing the component of the molten zinc, the optimum temperature range of the wiping gas was also changed. In Comparative Example 12, generation of larger hot water wrinkles than in Comparative Example 1 was confirmed. This is thought to be because hot water wrinkles are likely to occur because Mg in the plating layer component is easily oxidized. In Invention Example 10, by controlling the temperature T of the wiping gas, it was possible to prevent hot water wrinkle defects as in Invention Example 1.
- the hot water wrinkle defect prevention effect can be obtained by wiping at an appropriate wiping gas temperature.
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Abstract
Description
[1]溶融金属めっき浴に連続的に鋼帯を浸漬し、前記溶融金属めっき浴から引き出された直後の前記鋼帯にガスワイピングノズルから気体を吹きつけてめっき付着量を制御する連続溶融金属めっき方法において、前記ガスワイピングノズル先端と鋼帯との距離Dと、前記ガスワイピングノズルギャップBの比で表されるD/B値に応じて、前記ガスワイピングノズルから噴射されるワイピングガスの温度Tを制御する連続溶融金属めっき方法。
[2][1]に記載の連続溶融金属めっき方法において、前記ガスワイピングノズルから噴射されるワイピングガスは不活性ガスである連続溶融金属めっき方法。
[3][1]または[2]に記載の連続溶融金属めっき方法において、前記溶融金属めっき浴の溶融金属の融点をTMとすると、ワイピングガスの温度TをD/B値に応じて下記式(1)の範囲で制御する連続溶融金属めっき方法。 The gist of the present invention is as follows.
[1] A continuous molten metal in which a steel strip is continuously immersed in a molten metal plating bath, and gas is blown from a gas wiping nozzle to the steel strip immediately after being drawn out of the molten metal plating bath, thereby controlling the amount of plating adhered. In the plating method, the temperature of the wiping gas injected from the gas wiping nozzle according to a D / B value represented by a distance D between the gas wiping nozzle tip and the steel strip and a ratio of the gas wiping nozzle gap B A continuous molten metal plating method for controlling T.
[2] The continuous molten metal plating method according to [1], wherein the wiping gas sprayed from the gas wiping nozzle is an inert gas.
[3] In the continuous molten metal plating method according to [1] or [2], when the melting point of the molten metal in the molten metal plating bath is T M , the temperature T of the wiping gas is set as follows according to the D / B value. A continuous molten metal plating method controlled in the range of the formula (1).
TM:溶融金属の融点[℃]
D:鋼帯とガスワイピングノズル先端の距離[m]
B:ガスワイピングノズルギャップ[m]
c1、c2、c3:定数
[4][1]~[3]のいずれかに記載の連続溶融金属めっき方法により製造され、鋼帯表面に、Al:1.0~10質量%、Mg:0.2~1.0質量%、Ni:0.005~0.10質量%を含有し、残部がZn及び不可避的不純物からなるAl-Zn系めっき層を有する溶融亜鉛めっき鋼帯。
[5]鋼帯とガスワイピングノズル先端との距離を非接触で測定する距離計と、前記距離計により測定された距離Dと、前記ガスワイピングノズルのギャップBとに基づいて、ガスワイピングノズルから噴射するワイピングガスの目標温度Tを算出する制御装置と、ガスワイピングノズルから噴射する気体を前記制御装置により算出された目標温度Tまで昇温させる気体加熱装置とを有する連続溶融金属めっき設備。
[6]前記目標温度Tは、前記距離計により測定された距離Dと、前記ガスワイピングノズルのギャップBの比で表されるD/B値に応じて以下の式(1)により算出されることを特徴とする[5]に記載の連続溶融金属めっき設備。 T: Temperature of wiping gas injected from the gas wiping nozzle [° C.]
T M : Melting point of molten metal [° C.]
D: Distance between steel strip and gas wiping nozzle tip [m]
B: Gas wiping nozzle gap [m]
c 1 , c 2 , c 3 : produced by the continuous molten metal plating method according to any one of constants [4] [1] to [3], Al: 1.0 to 10% by mass on the surface of the steel strip, A hot-dip galvanized steel strip having an Al—Zn-based plating layer containing Mg: 0.2 to 1.0 mass%, Ni: 0.005 to 0.10 mass%, and the balance being Zn and inevitable impurities.
[5] Based on the distance meter that measures the distance between the steel strip and the gas wiping nozzle tip in a non-contact manner, the distance D measured by the distance meter, and the gap B of the gas wiping nozzle, from the gas wiping nozzle A continuous molten metal plating facility comprising: a control device that calculates a target temperature T of the wiping gas to be injected; and a gas heating device that raises the gas injected from the gas wiping nozzle to the target temperature T calculated by the control device.
[6] The target temperature T is calculated by the following equation (1) according to a D / B value represented by a ratio of the distance D measured by the distance meter and the gap B of the gas wiping nozzle. The continuous molten metal plating facility as described in [5].
TM:溶融金属の融点[℃]
D:鋼帯とガスワイピングノズル先端の距離[m]
B:ガスワイピングノズルギャップ[m]
c1、c2、c3:定数 T: Temperature of wiping gas injected from the gas wiping nozzle [° C.]
T M : Melting point of molten metal [° C.]
D: Distance between steel strip and gas wiping nozzle tip [m]
B: Gas wiping nozzle gap [m]
c 1 , c 2 , c 3 : constant
本発明の連続溶融金属めっき設備は、鋼帯を、溶融金属めっき浴槽内のめっき浴に連続的に浸漬してめっき処理を行った後、めっき浴から引上げ、めっき浴上方に設置したガスワイピングノズルからめっき鋼帯にワイピングガスを吹付けてめっき金属付着量を調整する設備である。そして、本発明の連続溶融金属めっき設備は、溶融金属めっき装置において、鋼帯とガスワイピングノズル先端との距離を非接触で測定する距離計と、前記距離計により測定された距離Dと、前記ガスワイピングノズルのギャップBとに基づいて、ガスワイピングノズルから噴射するワイピングガスの目標温度Tを算出する制御装置と、ガスワイピングノズルから噴射する気体を前記制御装置により算出された目標温度Tまで昇温させる気体加熱装置とを有することを特徴とする。 Hereinafter, the present invention will be specifically described.
The continuous molten metal plating facility of the present invention is a gas wiping nozzle that is pulled up from a plating bath after the steel strip is continuously immersed in a plating bath in a molten metal plating bath and then placed above the plating bath. This is a facility that adjusts the amount of plating metal adhesion by spraying wiping gas onto the plated steel strip. And the continuous molten metal plating equipment of the present invention is a molten metal plating apparatus, a distance meter for measuring the distance between the steel strip and the gas wiping nozzle tip in a non-contact manner, a distance D measured by the distance meter, Based on the gap B of the gas wiping nozzle, a control device for calculating the target temperature T of the wiping gas injected from the gas wiping nozzle, and the gas injected from the gas wiping nozzle is increased to the target temperature T calculated by the control device. And a gas heating device for heating.
×:不合格=目視で大きな湯ジワが確認できる亜鉛めっき鋼板(1.50<Wa)
△:不合格=目視で小さな湯ジワが確認できる亜鉛めっき鋼板(1.00<Wa≦1.50)
○:合格=目視で湯ジワが確認できない美麗な亜鉛めっき鋼板(0.50<Wa≦1.00)
図3の結果より、ワイピングガスの温度TをD/B値に応じて下記式(1)で示される範囲内で制御することが好ましい。 If the wiping gas temperature is too low, hot water wrinkle defects will occur due to a decrease in fluidity of the molten metal. If the temperature of the wiping gas is too high, alloying is promoted and the appearance of the steel sheet is deteriorated. For this reason, it is necessary to select the optimum temperature T of the wiping gas according to the value of D / B. Therefore, in the present invention, the relationship between the D / B value and the temperature T of the wiping gas for obtaining a product having a good appearance free from hot water wrinkle defects was determined. The temperature of the hot dip galvanizing bath is 460 ° C, the line speed is 100 m / min, the pressure of the nozzle header is 30 kPa, the gas type is air, and a steel strip with a plate thickness of 1.2 mm and a plate width of 1000 mm is passed through a continuous hot metal plating facility I let it plate. As a result, the relationship shown in FIG. 3 was obtained. In addition, in FIG. 3, the criteria regarding the generation | occurrence | production state of hot water wrinkles were performed by the following criteria. Wa is a value of the arithmetic average waviness Wa [μm] measured based on the standard of JIS B0601-2001.
×: Fail = Galvanized steel sheet (1.50 <Wa) where large hot water wrinkles can be confirmed visually
△: Fail = Galvanized steel sheet (1.00 <Wa ≦ 1.50) in which small hot water wrinkles can be visually confirmed
○: Pass = Beautiful galvanized steel sheet in which hot water wrinkles cannot be visually confirmed (0.50 <Wa ≦ 1.00)
From the result of FIG. 3, it is preferable to control the temperature T of the wiping gas within the range represented by the following formula (1) according to the D / B value.
TM:溶融金属の融点[℃]
D:鋼帯とガスワイピングノズル先端の距離[m]
B:ガスワイピングノズルギャップ[m]
c1、c2、c3:定数
なお、式(1)中の定数c1、c2、c3はワイピングノズルギャップBの大きさやノズル形状によって変化するため、事前にオフラインで求める必要がある。具体的には、鋼帯に見立てた板表面に温度計をセットし、その温度計の値を「ワイピングガスが鋼帯と衝突する衝突位置でのワイピングガスの温度」とする。D/Bの値を何条件か変更して、上記温度を測定し、c1~c3の値を求める。
さらに、D/B値が60超えではワイピングガスの掻き落とし力がほとんどないため、ワイピングガスを加熱する意味がない。このため、D/B値の上限は、60以下とすることが好ましい。 T: Temperature of wiping gas injected from the gas wiping nozzle [° C.]
T M : Melting point of molten metal [° C.]
D: Distance between steel strip and gas wiping nozzle tip [m]
B: Gas wiping nozzle gap [m]
c 1 , c 2 , c 3 : Constants Note that the constants c 1 , c 2 , c 3 in the formula (1) vary depending on the size of the wiping nozzle gap B and the nozzle shape, and therefore need to be obtained offline in advance. . More specifically, a thermometer is set on the surface of the plate that looks like a steel strip, and the value of the thermometer is defined as “the temperature of the wiping gas at the collision position where the wiping gas collides with the steel strip”. The D / B value is changed for some conditions, the above temperature is measured, and the values of c1 to c3 are obtained.
Further, when the D / B value exceeds 60, there is almost no wiping gas scraping force, so there is no point in heating the wiping gas. For this reason, the upper limit of the D / B value is preferably 60 or less.
また、ガスワイピングノズルへのガス供給方法として、常温のガスを熱交換器で所定温度まで加熱し、ブロアで所定圧力に加圧したものを供給する方法を採用した。なお、溶融金属の融点(TM)はAl=0.2質量%の場合はTM=420℃、Al=4.5質量%、Mg=0.5質量%、Ni=0.05質量%の場合はTM=375℃である。 In order to investigate the optimum installation conditions and embodiments of the gas wiping nozzle, a production test of a hot-dip galvanized steel strip was conducted. A gas wiping nozzle having a nozzle gap B = 1.2 mm was used. The gas wiping nozzle height from the hot dip galvanizing bath surface was 350 mm, and the wiping gas injection direction was perpendicular to the steel strip surface. Specifically, a steel strip having a thickness of 1.2 mm and a plate width of 1000 mm is passed at a line speed of 100 m / min, the composition of the plating layer, the distance D between the tip of the gas wiping nozzle and the steel strip, and the gas wiping nozzle The appearance of the steel sheet was evaluated by changing the gas pressure to be injected (nozzle header pressure), the gas set temperature, the gas type, and the coating adhesion amount. The hot dip galvanizing bath temperature was 460 ° C. Incidentally, where in advance offline testing respectively determined the constants of the formula (1), c 1 = 45 ,
Further, as a gas supply method to the gas wiping nozzle, a method was used in which normal temperature gas was heated to a predetermined temperature with a heat exchanger and pressurized to a predetermined pressure with a blower. The melting point (T M ) of the molten metal is T M = 420 ° C. when Al = 0.2 mass%, T M = 375 ° C. when Al = 4.5 mass%, Mg = 0.5 mass% and Ni = 0.05 mass%. It is.
×:不合格=目視で大きな湯ジワが確認できる亜鉛めっき鋼板(1.50<Wa)
△:不合格=目視で小さな湯ジワが確認できる亜鉛めっき鋼板(1.00<Wa≦1.50)
○:合格=目視で湯ジワが確認できない美麗な亜鉛めっき鋼板(0.50<Wa≦1.00)
◎:合格=目視で湯ジワが確認できない非常に美麗な亜鉛めっき鋼板(0<Wa≦0.50)
結果を表1に示す。 About the external appearance evaluation of the steel plate, the acceptability was judged according to the following criteria. Wa is the value of the arithmetic average waviness Wa [μm] measured based on the standard of JIS B0601-2001.
×: Fail = Galvanized steel sheet (1.50 <Wa) where large hot water wrinkles can be confirmed visually
△: Fail = Galvanized steel sheet (1.00 <Wa ≦ 1.50) in which small hot water wrinkles can be visually confirmed
○: Pass = Beautiful galvanized steel sheet in which hot water wrinkles cannot be visually confirmed (0.50 <Wa ≦ 1.00)
A: Pass = A very beautiful galvanized steel sheet (0 <Wa ≦ 0.50) in which no hot water wrinkles can be visually confirmed.
The results are shown in Table 1.
2 スナウト
3 めっき槽
4 溶融金属
5 シンクロール
6 ガスワイピングノズル
6a ガスワイピングノズルの上ノズル部材
6b ガスワイピングノズルの下ノズル部材
7 距離計
8 制御装置(CU)
9 気体加熱装置 DESCRIPTION OF SYMBOLS 1
9 Gas heating device
Claims (6)
- 溶融金属めっき浴に連続的に鋼帯を浸漬し、前記溶融金属めっき浴から引き出された直後の前記鋼帯にガスワイピングノズルから気体を吹きつけてめっき付着量を制御する連続溶融金属めっき方法において、前記ガスワイピングノズル先端と鋼帯との距離Dと、前記ガスワイピングノズルギャップBの比で表されるD/B値に応じて、前記ガスワイピングノズルから噴射されるワイピングガスの温度Tを制御する連続溶融金属めっき方法。 In a continuous molten metal plating method in which a steel strip is continuously immersed in a molten metal plating bath and gas is blown from a gas wiping nozzle to the steel strip immediately after being drawn out from the molten metal plating bath to control the amount of plating adhered. The temperature T of the wiping gas injected from the gas wiping nozzle is controlled according to a D / B value represented by a distance D between the gas wiping nozzle tip and the steel strip and a ratio of the gas wiping nozzle gap B. Continuous molten metal plating method.
- 請求項1に記載の連続溶融金属めっき方法において、前記ガスワイピングノズルから噴射されるワイピングガスは不活性ガスである連続溶融金属めっき方法。 2. The continuous molten metal plating method according to claim 1, wherein the wiping gas sprayed from the gas wiping nozzle is an inert gas.
- 請求項1または2に記載の連続溶融金属めっき方法において、前記溶融金属めっき浴の溶融金属の融点をTMとすると、ワイピングガスの温度TをD/B値に応じて下記式(1)の範囲で制御する連続溶融金属めっき方法。
TM:溶融金属の融点[℃]
D:鋼帯とガスワイピングノズル先端の距離[m]
B:ガスワイピングノズルギャップ[m]
c1、c2、c3:定数 In the process a continuous molten metal plating according to claim 1 or 2, wherein when a melting point T M of molten metal in the molten metal plating bath, the following equation in accordance with the temperature T of the wiping gas to D / B value (1) Continuous molten metal plating method controlled by range.
T M : Melting point of molten metal [° C.]
D: Distance between steel strip and gas wiping nozzle tip [m]
B: Gas wiping nozzle gap [m]
c 1 , c 2 , c 3 : constant - 請求項1~3のいずれか一項に記載の連続溶融金属めっき方法により製造され、鋼帯表面に、Al:1.0~10質量%、Mg:0.2~1.0質量%、Ni:0.005~0.10質量%を含有し、残部がZn及び不可避的不純物からなるAl-Zn系めっき層を有する溶融亜鉛めっき鋼帯。 It is produced by the continuous molten metal plating method according to any one of claims 1 to 3, and on the surface of the steel strip, Al: 1.0 to 10 mass%, Mg: 0.2 to 1.0 mass%, Ni : Hot-dip galvanized steel strip having an Al—Zn-based plating layer containing 0.005 to 0.10% by mass with the balance being Zn and inevitable impurities.
- 鋼帯とガスワイピングノズル先端との距離を非接触で測定する距離計と、前記距離計により測定された距離Dと、前記ガスワイピングノズルのギャップBとに基づいて、ガスワイピングノズルから噴射するワイピングガスの目標温度Tを算出する制御装置と、ガスワイピングノズルから噴射する気体を前記制御装置により算出された目標温度Tまで昇温させる気体加熱装置とを有する連続溶融金属めっき設備。 Wiping sprayed from the gas wiping nozzle based on a distance meter that measures the distance between the steel strip and the gas wiping nozzle tip in a non-contact manner, a distance D measured by the distance meter, and a gap B of the gas wiping nozzle A continuous molten metal plating facility comprising: a control device that calculates a target temperature T of gas; and a gas heating device that raises the gas injected from the gas wiping nozzle to the target temperature T calculated by the control device.
- 前記目標温度Tは、前記距離計により測定された距離Dと、前記ガスワイピングノズルのギャップBの比で表されるD/B値に応じて以下の式(1)により算出される請求項5に記載の連続溶融金属めっき設備。
TM:溶融金属の融点[℃]
D:鋼帯とガスワイピングノズル先端の距離[m]
B:ガスワイピングノズルギャップ[m]
c1、c2、c3:定数 The target temperature T is calculated by the following equation (1) according to a D / B value represented by a ratio of a distance D measured by the distance meter and a gap B of the gas wiping nozzle. The continuous molten metal plating equipment described in 1.
T M : Melting point of molten metal [° C.]
D: Distance between steel strip and gas wiping nozzle tip [m]
B: Gas wiping nozzle gap [m]
c 1 , c 2 , c 3 : constant
Priority Applications (5)
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KR1020177009127A KR101910756B1 (en) | 2014-10-08 | 2015-09-16 | Continuous hot-dip metal coating method, galvanized steel strip, and continuous hot-dip metal coating facility |
JP2016501923A JP6011740B2 (en) | 2014-10-08 | 2015-09-16 | Continuous molten metal plating method, hot dip galvanized steel strip, and continuous molten metal plating facility |
CN201580054270.3A CN106795614B (en) | 2014-10-08 | 2015-09-16 | The continuous coating method of molten metal and molten zinc plating steel band and the continuous plating equipment of molten metal |
EP15848228.1A EP3205741B1 (en) | 2014-10-08 | 2015-09-16 | Continuous hot-dip metal plating method and continuous hot-dip metal plating equipment |
MX2017004585A MX2017004585A (en) | 2014-10-08 | 2015-09-16 | Continuous hot-dip metal plating method, hot-dip zinc-plated steel strip, and continuous hot-dip metal plating equipment. |
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JP (1) | JP6011740B2 (en) |
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JP2022000535A (en) * | 2020-06-17 | 2022-01-04 | Jfeスチール株式会社 | Method for generating coating weight prediction model, method for predicting plating coating weight, method for controlling plating coating weight, method for manufacturing hot-dip metal coated steel sheet, device for performing them and method for generating quality prediction model |
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CN106795614B (en) | 2019-11-01 |
JPWO2016056178A1 (en) | 2017-04-27 |
JP6011740B2 (en) | 2016-10-19 |
EP3205741A1 (en) | 2017-08-16 |
KR101910756B1 (en) | 2018-10-22 |
TWI561675B (en) | 2016-12-11 |
KR20170048549A (en) | 2017-05-08 |
TW201619411A (en) | 2016-06-01 |
EP3205741A4 (en) | 2017-08-30 |
EP3205741B1 (en) | 2023-04-05 |
CN106795614A (en) | 2017-05-31 |
MX2017004585A (en) | 2017-06-27 |
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