JPWO2016056178A1 - Continuous molten metal plating method, hot dip galvanized steel strip, and continuous molten metal plating facility - Google Patents

Continuous molten metal plating method, hot dip galvanized steel strip, and continuous molten metal plating facility Download PDF

Info

Publication number
JPWO2016056178A1
JPWO2016056178A1 JP2016501923A JP2016501923A JPWO2016056178A1 JP WO2016056178 A1 JPWO2016056178 A1 JP WO2016056178A1 JP 2016501923 A JP2016501923 A JP 2016501923A JP 2016501923 A JP2016501923 A JP 2016501923A JP WO2016056178 A1 JPWO2016056178 A1 JP WO2016056178A1
Authority
JP
Japan
Prior art keywords
gas
molten metal
steel strip
metal plating
wiping nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2016501923A
Other languages
Japanese (ja)
Other versions
JP6011740B2 (en
Inventor
優 寺崎
優 寺崎
高橋　秀行
秀行 高橋
三宅　勝
勝 三宅
悠祐 安福
悠祐 安福
琢実 小山
琢実 小山
淳史 稲葉
淳史 稲葉
佐々木　成人
成人 佐々木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Application granted granted Critical
Publication of JP6011740B2 publication Critical patent/JP6011740B2/en
Publication of JPWO2016056178A1 publication Critical patent/JPWO2016056178A1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • 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
    • 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
    • C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing

Abstract

ガスワイピングノズルを用いてめっき付着量の制御を行う溶融金属めっき鋼帯の製造方法において、めっき表面欠陥の発生を抑え、高品質の溶融金属めっき鋼帯をより低コストで安定して製造することができる連続溶融金属めっき方法および溶融亜鉛めっき鋼帯ならびに連続溶融金属めっき設備を提供することを目的とする。溶融金属めっき浴に連続的に鋼帯を浸漬し、溶融金属めっき浴から引き出された直後の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、ガスワイピングノズル先端と鋼帯との距離Ｄと、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、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 the manufacturing method of hot-dip metal-plated steel strip that controls the amount of plating applied using a gas wiping nozzle, suppress the occurrence of plating surface defects and stably manufacture high-quality hot-dip metal-plated steel strip at a lower cost. An object of the present invention is to provide a continuous molten metal plating method, a hot dip galvanized steel strip, and a continuous molten metal plating facility capable of performing the above. 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 of the molten metal plating bath, the amount of plating adhered is controlled. Continuous molten metal plating that controls the temperature T of the wiping gas injected from the gas wiping nozzle according to the D / B value represented by the ratio of the distance D between the wiping nozzle tip and the steel strip and the gas wiping nozzle gap B Method.

Description

本発明は、連続溶融金属めっき方法および溶融亜鉛めっき鋼帯ならびに連続溶融金属めっき設備に関する。   The present invention relates to a continuous molten metal plating method, a hot dip galvanized steel strip, and a continuous molten metal plating facility.

連続溶融めっきプロセスにおいては、図４に示すように、鋼帯１は、スナウト２内からめっき槽３内の溶融金属４に進入し、シンクロール５により方向転換されてめっき槽３から引き上げられる。次いで、めっき槽３上方に設置されたガスワイピングノズル６により余剰の溶融金属が掻き取られ、所定のめっき付着量に制御されるとともに、鋼帯１の表面に付着した溶融金属が板幅方向および板長手方向で均一化される。ガスワイピングノズル６は、多様な鋼帯幅に対応するため、また、鋼帯引き上げ時の幅方向の位置ズレなどに対応するため、通常、鋼帯幅より長く構成されており、鋼帯１の幅端部より外側まで延びている。   In the continuous hot dipping process, as shown in FIG. 4, the steel strip 1 enters the molten metal 4 in the plating bath 3 from the inside of the snout 2, is turned by the sink roll 5, and is pulled up from the plating bath 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 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.

このようなガスワイピング方式では、ワイピングガスの吹き付けによる鋼帯の微小振動やめっき層の不規則な湯流れなどのために、めっき表面に波形流紋状の湯ジワ（湯ダレとも呼ばれる）を発生することが多い。このような湯ジワが生じためっき鋼板は、外装板の用途においてめっき表面を塗装下地表面とした場合、塗膜の表面性状、特に平滑性が阻害され、外観の優れた塗装処理に適合すべき外装板に用いることが出来ず、めっき鋼板の歩留まりに大きな影響を及ぼす。   In such a gas wiping method, corrugated flow-shaped hot water wrinkles (also called hot water sagging) 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.

上記に対して、溶融金属めっき鋼板の外観不良である湯ジワ欠陥を防止するため、以下のような方法が提案されている。   In contrast to the above, the following method has been proposed in order to prevent a hot metal wrinkle defect which is an appearance defect of a molten metal plated steel sheet.

特許文献１に示される方法は、鋼板めっき後の工程である調質圧延を行うに際して、調質圧延ロールの表面性状や圧延条件を変えることで、湯ジワを目立たなくする方法である。特許文献２に示される方法は、鋼板を溶融亜鉛めっき浴中に導入する前に、スキンパスミル及びテンションレベラー等を用いて鋼板表面の粗さをめっき付着量に応じて調整して湯ジワの発生を抑制する方法である。特許文献３に示される方法は、板厚に対して適正なラインスピード、ワイピングノズルの浴面からの高さを設定し、湯ジワの発生を抑制する方法である。   The method disclosed in Patent Document 1 is a method of making hot water 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. In the method shown in Patent Document 2, before introducing the steel sheet into the hot dip galvanizing bath, 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.

特開２００４−２７２６３号公報JP 2004-27263 A 特開昭５５−２１５６４号公報JP-A-55-21564 特開平９−４１１１３号公報JP-A-9-41113

しかしながら、本発明者らが検討したところによれば、特許文献１に示された方法では軽微な湯ジワは改善されるが、重度の湯ジワ欠陥に対しては効果が見られなかった。また、特許文献２に示された方法では、溶融亜鉛めっき浴の前工程にスキンパスミル、テンションレベラー等を設置する必要性からコスト的な問題点がある。また、これらを設置した場合も、前処理設備及び焼鈍炉での酸洗及び再結晶化に伴う化学的・物理的変化によって理想とする表面粗度が得られにくく、湯ジワ発生を完全に防止することが困難であると考えられる。さらに、特許文献３に示された方法では、板厚の変化点に対してライン速度やワイピングノズル高さはすぐに追従できないため、湯ジワが発生する鋼板が出来てしまい、歩留まりロスに繋がってしまう。   However, according to a study by the present inventors, the method shown in Patent Document 1 improves minor hot water wrinkles, but has no effect on severe hot water wrinkle defects. In addition, 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. In addition, even when these are installed, 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. Furthermore, in 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.

本発明は、上記実情に鑑みてなされたものであって、ガスワイピングノズルを用いてめっき付着量の制御を行う連続溶融金属めっき方法において、湯ジワ欠陥の発生を抑え、高品質の溶融金属めっき鋼帯をより低コストで安定して製造することができる連続溶融金属めっき方法および溶融亜鉛めっき鋼帯ならびに連続溶融金属めっき設備を提供することを目的とする。   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.

本発明の要旨は以下のとおりである。
［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).

Figure 2016056178
Figure 2016056178

Ｔ：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［℃］
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 steel strip surface, 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].

Figure 2016056178
Figure 2016056178

Ｔ：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［℃］
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

本発明によれば、湯ジワと呼ばれるめっき表面欠陥の発生を抑え、高品質の溶融金属めっき鋼帯をより低コストで安定して製造することが可能となる。   ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to suppress the generation | occurrence | production of the plating surface defect called hot water wrinkles, and to manufacture a high quality hot-dip metal plating steel strip stably at lower cost.

図１は、本発明の一実施形態である連続溶融金属めっき鋼帯の製造設備の概略図である。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. 図２は、本発明の一実施形態であるガスワイピングノズルの先端の拡大図である。FIG. 2 is an enlarged view of the tip of a gas wiping nozzle according to an embodiment of the present invention. 図３は、Ｄ／Ｂ値とワイピングガスの温度Ｔとの関係における、湯ジワ発生の有無を示すグラフである。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. 図４は、従来の連続溶融金属めっき鋼帯の製造設備の概略図である。FIG. 4 is a schematic view of a conventional continuous hot-dip metal-plated steel strip production facility.

以下、本発明について具体的に説明する。
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.

図１は、本発明の実施の形態に係る連続溶融金属めっき装置である。図１において、１は鋼帯、２はスナウト、３はめっき槽、４は溶融金属、５はシンクロール、６はガスワイピングノズル、７は距離計、８は制御装置（ＣＵ：Ｃｏｎｔｒｏｌ Ｕｎｉｔ）、９は気体加熱装置である。矢印は鋼帯１の移動方向を示す。鋼帯１は、スナウト２内からめっき槽３内の溶融金属４に進入し、シンクロール５により方向転換されてめっき槽３から引き上げられる。次いで、めっき槽３上方に設置されたガスワイピングノズル６により余剰の溶融金属が掻き取られ所定の付着量に制御される。   FIG. 1 is a continuous molten metal plating apparatus according to an embodiment of the present invention. In FIG. 1, 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.

図２はガスワイピングノズル６の先端の拡大図である。本発明では、便宜的に、ガスワイピングノズル６の先端と鋼帯１との距離をＤで表す。また、ガスワイピングノズル６の上ノズル部材を６ａ、ガスワイピングノズルの下ノズル部材を６ｂとするとき、ガスワイピングノズル６のギャップをＢで表す。   FIG. 2 is an enlarged view of the tip of the gas wiping nozzle 6. In the present invention, for the sake of convenience, the distance between the tip of the gas wiping nozzle 6 and the steel strip 1 is represented by D. Further, when the upper nozzle member of the gas wiping nozzle 6 is 6a and the lower nozzle member of the gas wiping nozzle is 6b, the gap of the gas wiping nozzle 6 is represented by B.

距離計７は例えばガスワイピングノズル６の下方に設けられる。距離計７は、ガスワイピングノズル６の先端と鋼帯１との距離Ｄを連続的に測定し、その情報を制御装置８に入力する。制御装置８は、距離計７から送られてくる距離Ｄの測定情報に基づき、気体加熱装置９で加熱するワイピングガスの目標温度を算出する。気体加熱装置９では、制御装置８で算出した目標温度までワイピングガスを昇温させ、昇温したワイピングガスをガスワイピングノズル６に供給する機能を有する。なお、距離計７については、非接触の形式であればよい。制御装置８の形式は特に限定されない。気体加熱装置９についても形式は特に限定されず、ガスワイピングノズル６と鋼帯１との距離Ｄに合わせて遅滞無くワイピングガスを昇温する機能を有していればよい。また、気体加熱装置９における、ガスワイピングノズル６に供給するワイピングガスの昇温方法についても、特に限定されない。例えば、熱交換器で加熱昇温して供給する方法、焼鈍炉の燃焼排ガスと空気を混合する方法が挙げられる。   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.

本発明では、ガスワイピングノズル６の先端と鋼帯１との距離Ｄと、ガスワイピングノズル６のギャップＢの比で表されるＤ／Ｂ値に応じて、ガスワイピングノズル６から噴射されるワイピングガスの温度Ｔを制御することを特徴とする。Ｄ／Ｂ値に応じてワイピングガスの温度Ｔを制御することにより、溶融金属の流動性が向上する。その結果、溶融金属が規則的に流下するため、湯ジワ欠陥を防止する効果を十分に発揮することができる。   In the present invention, 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. By controlling the temperature T of the wiping gas according to the D / B value, the fluidity of the molten metal is improved. As a result, since the molten metal flows down regularly, the effect of preventing hot water wrinkle defects can be sufficiently exhibited.

本発明では、ガスワイピングノズル６から噴射されるワイピングガスは、不活性ガスであることが好ましい。不活性ガスにすることで、鋼板表面上の溶融金属の酸化を防止できるため、溶融金属の流動性をさらに向上させることができる。不活性ガスとしては、窒素、アルゴン、ヘリウム、二酸化炭素等が挙げられるが、これらに限定されるものではない。   In the present invention, the wiping gas injected from the gas wiping nozzle 6 is preferably 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. Examples of the inert gas include, but are not limited to, nitrogen, argon, helium, carbon dioxide and the like.

ワイピングガス温度が低すぎると、溶融金属の流動性低下による湯ジワ欠陥が起きてしまう。また、ワイピングガスの温度が高すぎると合金化が促進され、鋼板の外観が悪化してしまう。このため、Ｄ／Ｂの値に応じて最適なワイピングガスの温度Ｔを選定する必要がある。そこで本発明では、湯ジワ欠陥の発生しない外観が良好な製品を得るためのＤ／Ｂ値とワイピングガスの温度Ｔとの関係について求めた。溶融亜鉛めっき浴の温度は４６０℃、ライン速度は１００ｍ／ｍｉｎ、ノズルヘッダの圧力は３０ｋＰａ、ガス種は空気として、板厚１．２ｍｍ×板幅１０００ｍｍの鋼帯を連続溶融金属めっき設備に通板させた。その結果、図３に示すような関係が得られた。なお、図３において、湯ジワの発生状況に関する判定基準は下記の基準により行った。Ｗａは、ＪＩＳ Ｂ０６０１−２００１の規格に基づいて測定した算術平均うねりＷａ［μm］の値である。
×：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 × 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 criterion regarding the generation | occurrence | production state of a hot water wrinkle was performed by the following reference | standard. 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.

Figure 2016056178
Figure 2016056178

Ｔ：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［℃］
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 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、本発明では、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を溶融金属の融点ＴＭの上下２００℃（（ＴＭ±１００）℃）以内に制御することが好ましい。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を（ＴＭ−１００）℃未満にすると、鋼板に付着している溶融金属の凝固割合が非常に高くなり、溶融金属の流動性が低下するため、湯ジワ欠陥が発生してしまう。なお、例えば、熱交換器を使用する際には、加熱側である気体や液体の温度を変更することで、被加熱側であるワイピングガスの温度を制御することができる。しかしながら、上記の制御方法に限定されない。In the present invention, it is preferred that 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) ℃ ). When wiping gas is (T M -100) the temperature of the wiping gas in the collision position to collide with the steel strip to less than ° C., solidification rate of molten metal adhering to the steel sheet becomes very high, the fluidity of the molten metal As a result, the hot water wrinkle defect will occur. For example, when using a heat exchanger, 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. However, it is not limited to the above control method.

一方で、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を（ＴＭ＋１００）℃超えにすると、鋼帯と溶融金属の合金化を促進してしまい、鋼板の外観が悪化するのに加えて、狙いのめっき付着量よりも増加してしまう。さらに、気体の加熱に余分なエネルギーが消費されるため、エネルギー効率も悪化してしまう。また、非特許文献１（鉄と鋼 Ｖｏｌ．８１ （１９９５） Ｎｏ．２、Ｐ４９）のＦｉｇ．５に示されているように、ワイピングガスのポテンシャルコアはＤ／Ｂ値に比例して減衰することが知られているため、Ｄ／Ｂ値に応じて適切なガス温度を設定する必要がある。On the other hand, when the temperature of the wiping gas at the collision position where the wiping gas collides with the steel strip exceeds (T M +100) ° C., alloying of the steel strip and the molten metal is promoted, and the appearance of the steel plate deteriorates. In addition to the above, the target amount of plating increases. Furthermore, since extra energy is consumed for heating the gas, energy efficiency is also deteriorated. Further, FIG. Of Non-Patent Document 1 (Iron and Steel Vol. 81 (1995) No. 2, P49). 5, it is known that the potential core of the wiping gas attenuates in proportion to the D / B value, so it is necessary to set an appropriate gas temperature according to the D / B value. .

なお、溶融金属めっき（めっき層）の成分が変わると融点が変化するため、ワイピングガス温度Tの最適範囲は変化する。   In addition, since the melting point changes when the component of the molten metal plating (plating layer) changes, the optimum range of the wiping gas temperature T changes.

また、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の場合、ＡｌやＺｎよりも酸化しやすいＭｇが入っているため、ワイピングガス温度が低い場合、特に溶融金属の流動性が悪化して湯ジワが発生しやすくなることが確認されている。その結果、表面外観が悪くなる。そのため、本発明のガスワイピング方法を用いて製造した溶融亜鉛めっき鋼帯であって、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の場合、ワイピングガス温度を最適化することにより湯ジワ欠陥を防止する効果がより顕著に表れる。   Moreover, Al: 1.0-10 mass%, Mg: 0.2-1.0 mass%, Ni: 0.005-0.10 mass% are contained in the steel strip surface, and the remainder is Zn and unavoidable In the case of a hot-dip galvanized steel strip having an Al—Zn-based plating layer made of impurities, Mg, which is easier to oxidize than Al or Zn, is contained, so when the wiping gas temperature is low, the fluidity of the molten metal deteriorates. It has been confirmed that hot water wrinkles are likely to occur. As a result, the surface appearance is deteriorated. Therefore, it is a hot dip galvanized steel strip manufactured by using the gas wiping method of the present invention, on the surface of the steel strip, Al: 1.0 to 10 mass%, Mg: 0.2 to 1.0 mass%, Ni : In the case of a hot-dip galvanized steel strip having an Al—Zn-based plating layer containing 0.005 to 0.10% by mass and the balance consisting of Zn and inevitable impurities, by optimizing the wiping gas temperature, The effect of preventing defects appears more remarkably.

ガスワイピングノズルの最適な設置条件、実施形態を調査するため、溶融亜鉛めっき鋼帯の製造試験を行った。ガスワイピングノズルは、ノズルギャップＢ＝１．２ｍｍを備えるものを使用した。溶融亜鉛めっき浴面からガスワイピングノズル高さを３５０ｍｍとし、ワイピングガスの噴射方向は鋼帯面に垂直とした。具体的には、板厚１．２ｍｍ×板幅１０００ｍｍの鋼帯を、ライン速度１００ｍ／ｍｉｎで通板し、めっき層の組成、ガスワイピングノズル先端と鋼帯間の距離Ｄ、ガスワイピングノズルから噴射するガス圧力（ノズルヘッダ圧力）、ガス設定温度、ガス種、めっき付着量を変化させ、鋼板の外観を評価した。溶融亜鉛めっき浴温度は４６０℃とした。なお、事前のオフラインテストで式（１）中の定数をそれぞれ求めたところ、ｃ１＝４５、ｃ２＝１．５、ｃ３＝２．５であった。
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 , c 2 = 1.5, it was c 3 = 2.5.
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.

鋼板の外観評価については、以下の基準で合否を判断した。なお、Ｗａは、ＪＩＳ Ｂ０６０１−２００１の規格に基づいて測定した算術平均うねりＷａ［μｍ］の値である。
×：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.

Figure 2016056178
Figure 2016056178

発明例１は、Ｄ／Ｂ値に応じた最適なガス温度でワイピングすることにより、湯ジワ欠陥を防止できている。湯ジワ欠陥を防止できた理由としては、Ｄ／Ｂ値に応じた最適なガス温度でワイピングを行ったのに加え、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が（ＴＭ−１００）℃以上になることで、噴出ガスによる冷却効果を阻害し、鋼板に付着した溶融亜鉛が比較的凝固せず、規則的に流下できたためと考えられる。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 thought that by being M- 100) ° C. or higher, the cooling effect by the jet gas was hindered, and the molten zinc adhering to the steel sheet did not solidify relatively and could flow down regularly.

また、発明例２では、Ｄ／Ｂを変更し、その値に応じた最適なワイピングガスの温度Ｔでワイピングしており、発明例１と同じく湯ジワ欠陥を防止できている。発明例３〜８に各Ｄ／Ｂ値に対して、ワイピング温度を変更した際の結果を示している。   Further, in Invention Example 2, D / B is changed, and wiping is performed at the optimum temperature T of the wiping gas corresponding to the value, and hot water wrinkle defects can be prevented as in Invention Example 1. Inventive Examples 3 to 8 show the results when the wiping temperature is changed for each D / B value.

一方、比較例１及び比較例２では、Ｄ／Ｂ値から導出される最適ガス温度範囲を外れた場合の実施例を示している。比較例１で付着量が増加する原因として、Ｄ／Ｂ値に応じた最適ガス温度範囲を外れた温度でワイピングを行ったのに加え、ノズルから噴出されたワイピングガスが周囲の気体と混合され、鋼帯衝突位置でのワイピングガスの温度が（ＴＭ−１００）℃を下回ったためと考えられる。比較例２では、発明例１よりも更に高いワイピングガスの温度に昇温しており、付着量は増加している。これはワイピングガス温度が高すぎるため、鋼帯表層の亜鉛めっきの合金化が促進されたためと考えられる。なおかつ、合金化の促進により、鋼板表面が白っぽく変色して外観も悪化してしまった。その他のワイピング条件での結果は、比較例３〜１１に示す。On the other hand, 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. , presumably because the temperature of the wiping gas in the strip collision position is below the (T M -100) ℃. In Comparative Example 2, 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 3-11.

また、発明例１０及び比較例１２ではめっき層の組成を変更した実施例を示している。溶融亜鉛の成分を変更したことで亜鉛浴の融点が３７５℃に低下したため、ワイピングガスの最適温度範囲も変化している。比較例１２では比較例１よりも、より大きな湯ジワの発生が確認できた。これは、めっき層成分中のＭｇが酸化しやすいため、湯ジワが発生しやすくなったと考えられる。発明例１０では、ワイピングガスの温度Ｔを制御することで、発明例１と同じく湯ジワ欠陥を防止することができた。   Inventive 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.

さらに、発明例９及び発明例１０では、ガス種を不活性ガスである窒素にしたため、発明例１と比べてより良好な外観を得られている。   Furthermore, in Invention Example 9 and Invention Example 10, since the gas species was nitrogen which is an inert gas, a better appearance was obtained compared to Invention Example 1.

以上より、適切なワイピングガスの温度でワイピングすることにより、湯ジワ欠陥防止効果が得られる。   As described above, the wiping defect prevention effect can be obtained by wiping at an appropriate wiping gas temperature.

１ 鋼帯
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 Steel strip 2 Snout 3 Plating tank 4 Molten metal 5 Sink roll 6 Gas wiping nozzle 6a Upper nozzle member of gas wiping nozzle 6b Lower nozzle member of gas wiping nozzle 7 Distance meter 8 Control unit (CU)
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。
Figure 2016056178
 Ｔ：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［℃］
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.
Figure 2016056178
 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 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 manufactured 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% by mass, Mg: 0.2 to 1.0% by 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。
Figure 2016056178
 Ｔ：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［℃］
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.
Figure 2016056178
 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
JP2016501923A 2014-10-08 2015-09-16 Continuous molten metal plating method, hot dip galvanized steel strip, and continuous molten metal plating facility Active JP6011740B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2014206882 2014-10-08
JP2014206882 2014-10-08
PCT/JP2015/004715 WO2016056178A1 (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

Publications (2)

Publication Number Publication Date
JP6011740B2 JP6011740B2 (en) 2016-10-19
JPWO2016056178A1 true JPWO2016056178A1 (en) 2017-04-27

Family

ID=55652818

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2016501923A Active JP6011740B2 (en) 2014-10-08 2015-09-16 Continuous molten metal plating method, hot dip galvanized steel strip, and continuous molten metal plating facility

Country Status (7)

Country Link
EP (1) EP3205741B1 (en)
JP (1) JP6011740B2 (en)
KR (1) KR101910756B1 (en)
CN (1) CN106795614B (en)
MX (1) MX2017004585A (en)
TW (1) TW201619411A (en)
WO (1) WO2016056178A1 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6500846B2 (en) * 2016-06-17 2019-04-17 Ｊｆｅスチール株式会社 Method of manufacturing hot-dip metallized steel strip and continuous hot-dip metal plating equipment
JP6372527B2 (en) * 2016-07-13 2018-08-15 Ｊｆｅスチール株式会社 Manufacturing method of molten metal plating steel strip and continuous molten metal plating equipment
JP6635086B2 (en) * 2017-04-05 2020-01-22 Ｊｆｅスチール株式会社 Manufacturing method of hot-dip galvanized steel strip
KR102371083B1 (en) 2017-04-14 2022-03-07 현대자동차주식회사 Method for Natural Ventilation Car Inside using Conditioned Link and Vehicle thereby
DE102017216572A1 (en) * 2017-09-19 2019-03-21 Thyssenkrupp Ag Hot dip coated steel strip with improved surface appearance and method of making the same
KR102031466B1 (en) 2017-12-26 2019-10-11 주식회사 포스코 Zinc alloy coated steel having excellent surface property and corrosion resistance, and method for manufacturing the same
JP6414360B2 (en) * 2018-05-25 2018-10-31 Ｊｆｅスチール株式会社 Manufacturing method of molten metal plated steel strip
AU2019323956B2 (en) * 2018-08-22 2021-11-11 Jfe Steel Corporation Method of producing hot-dip metal coated steel strip and continuous hot-dip metal coating line
US11535923B2 (en) * 2018-12-11 2022-12-27 M.E.C Co., Ltd Method for manufacturing molten galvanized steel sheet
JP6702519B1 (en) 2019-02-26 2020-06-03 Ｊｆｅスチール株式会社 Gas wiping nozzle and method for manufacturing hot-dip galvanized metal strip
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
WO2021256079A1 (en) 2020-06-19 2021-12-23 Ｊｆｅスチール株式会社 Gas wiping nozzle and method for manufacturing molten metal-plated metal band
KR20220127594A (en) 2021-03-11 2022-09-20 (주)스텝이엔지 Hot-dip galvanizing tank burn hazard multi-level warning device

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54135628A (en) * 1978-04-13 1979-10-22 Nippon Kokan Kk <Nkk> Continuous type hot dipping method
JPS5521564A (en) * 1978-08-04 1980-02-15 Kawasaki Steel Corp Preparation of melted zinc plated steel plate for sheath plate
CA2139119C (en) * 1993-04-28 2001-03-13 Kazunari Andachi Method for adjusting coating weight by gas wiping
JP3011395B2 (en) * 1995-07-31 2000-02-21 川崎製鉄株式会社 Method for producing thick galvanized steel sheet with excellent surface properties
JPH09195023A (en) * 1996-01-11 1997-07-29 Sumitomo Metal Ind Ltd Gap variable type gas wiping nozzle device
JPH09195024A (en) * 1996-01-19 1997-07-29 Nkk Corp Method for controlling coating weight of hot dip metal coating
JP3779941B2 (en) * 2002-01-09 2006-05-31 新日本製鐵株式会社 Galvanized steel sheet with excellent post-painting corrosion resistance and paint clarity
JP2004027263A (en) * 2002-06-24 2004-01-29 Sumitomo Metal Ind Ltd Hot dip galvanized steel sheet having excellent surface appearance and method of producing the same
JP4946167B2 (en) * 2006-05-12 2012-06-06 Ｊｆｅスチール株式会社 Manufacturing method of molten metal plated steel strip
JP5942359B2 (en) * 2011-08-25 2016-06-29 Ｊｆｅスチール株式会社 Continuous molten metal plating treatment method and continuous molten metal plating treatment apparatus
JP6031906B2 (en) * 2012-09-11 2016-11-24 Ｊｆｅスチール株式会社 Wiping method for continuous molten metal-plated steel strip.
WO2014135753A1 (en) * 2013-03-06 2014-09-12 Arcelormittal Investigacion Y Desarrollo, S.L. A method for manufacturing a metal sheet with a znal coating and with optimised drying, corresponding metal sheet, part and vehicle

Also Published As

Publication number Publication date
EP3205741B1 (en) 2023-04-05
EP3205741A1 (en) 2017-08-16
WO2016056178A1 (en) 2016-04-14
KR20170048549A (en) 2017-05-08
EP3205741A4 (en) 2017-08-30
CN106795614A (en) 2017-05-31
CN106795614B (en) 2019-11-01
JP6011740B2 (en) 2016-10-19
KR101910756B1 (en) 2018-10-22
TWI561675B (en) 2016-12-11
TW201619411A (en) 2016-06-01
MX2017004585A (en) 2017-06-27

Similar Documents

Publication Publication Date Title
JP6011740B2 (en) Continuous molten metal plating method, hot dip galvanized steel strip, and continuous molten metal plating facility
JP5764672B2 (en) High corrosion resistant hot dip galvanized steel sheet and method for producing the same
RU2007121258A (en) CONTROLLABLE DECREASE OF THE THICKNESS OF THE HOT-STEELED STEEL TAPE COATED BY THE MELT DIP AND THE APPLICABLE INSTALLATION
KR102405526B1 (en) Method of producing hot-dip metal coated steel strip and continuous hot-dip metal coating apparatus
KR102471806B1 (en) Manufacturing method of hot-dip metal plating steel strip and continuous hot-dip metal plating equipment
JP6500846B2 (en) Method of manufacturing hot-dip metallized steel strip and continuous hot-dip metal plating equipment
JP5824905B2 (en) Manufacturing method of molten metal plated steel strip
CN102712988A (en) Metal coated steel strip
KR101560935B1 (en) Plating Apparatus and Plating Method
JP6772930B2 (en) Manufacturing method of hot-dip galvanized steel sheet and hot-dip galvanized steel sheet
JP2007070663A (en) Hot dip metal coated steel strip manufacturing method, and continuous hot dip coating device
JP6394578B2 (en) Manufacturing method of molten metal plating steel strip and continuous molten metal plating equipment
JP6635086B2 (en) Manufacturing method of hot-dip galvanized steel strip
JP4835073B2 (en) Manufacturing method of molten metal plated steel strip
JPWO2020039869A1 (en) Method for producing hot-dip galvanized steel strip and continuous hot-dip galvanizing equipment
JP2016169430A (en) Method for manufacturing hot-dip galvanized steel sheet
JP2009228073A (en) Method for manufacturing hot dip coated steel sheet
JP6414360B2 (en) Manufacturing method of molten metal plated steel strip
JP2020503439A (en) Alloy-plated steel excellent in crack resistance and method for producing the same
JP7265217B2 (en) Galvanized steel sheet for hot stamping
JPH10226864A (en) Production of hot dip galvanized steel sheet
JP2000336466A (en) Production of hot dip zinc-aluminum alloy plated steel sheet
JP2023156878A (en) Production method of galvanized steel sheet
JP2008150642A (en) Method and device for producing hot dip plated steel sheet
JP6439755B2 (en) Method for producing galvannealed steel sheet

Legal Events

Date Code Title Description
TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20160823

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20160905

R150 Certificate of patent or registration of utility model

Ref document number: 6011740

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250