JP2002212696A - Hot dip metal coating device for band steel - Google Patents
Hot dip metal coating device for band steelInfo
- Publication number
- JP2002212696A JP2002212696A JP2001002750A JP2001002750A JP2002212696A JP 2002212696 A JP2002212696 A JP 2002212696A JP 2001002750 A JP2001002750 A JP 2001002750A JP 2001002750 A JP2001002750 A JP 2001002750A JP 2002212696 A JP2002212696 A JP 2002212696A
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- Prior art keywords
- plating
- plating bath
- weir
- bath
- metal
- 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.)
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- Coating With Molten Metal (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鋼帯の連続溶融金
属めっきにおいて、簡易な装置で、めっき浴中のドロス
の生成を効果的に抑制することが可能な鋼帯の溶融金属
めっき装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel strip hot metal plating apparatus capable of effectively suppressing dross generation in a plating bath with a simple apparatus in continuous hot metal plating of steel strip. .
【０００２】[0002]
【従来の技術】従来、優れた耐食性を有する溶融亜鉛め
っき鋼板などの溶融金属めっき鋼板、さらには溶融亜鉛
めっき鋼板を加熱合金化して得られる合金化溶融亜鉛め
っき鋼板が、自動車車体用鋼板、建築材料などとして広
く用いられている。図３に、従来の鋼帯の溶融金属めっ
き装置を縦断面図によって示す。2. Description of the Related Art Conventionally, hot-dip galvanized steel sheets such as hot-dip galvanized steel sheets having excellent corrosion resistance, and alloyed hot-dip galvanized steel sheets obtained by heat-alloying hot-dip galvanized steel sheets have been used for steel sheets for automobile bodies and construction. Widely used as materials. FIG. 3 is a longitudinal sectional view of a conventional steel strip hot metal plating apparatus.
【０００３】なお、図３において、１は溶融亜鉛などの
溶融金属であるめっき浴、２はめっき用ポット、３はめ
っき浴１中に浸漬配置されたシンクロール（以下、浴中
シンクロールまたはシンクロールと記す）、４は鋼
帯（：鋼板を含み、以下鋼板と記すこともある）、５は
スナウト、６は亜鉛インゴットなどの溶融金属補給用金
属インゴット（以下、金属インゴットとも記す）、７は
金属インゴットの装入装置、f1は鋼帯の搬送方向（通板
方向）、f2はシンクロールの回転方向、f3は金属インゴ
ットの投入方向を示す。In FIG. 3, reference numeral 1 denotes a plating bath made of a molten metal such as hot-dip zinc, 2 denotes a plating pot, and 3 denotes a sink roll immersed and arranged in the plating bath 1 (hereinafter, a sink roll in the bath or a sink roll). Reference numeral 4 denotes a steel strip (including a steel plate, sometimes referred to as a steel plate hereinafter), reference numeral 5 denotes a snout, reference numeral 6 denotes a metal ingot for supplying molten metal such as zinc ingot (hereinafter also referred to as a metal ingot), reference numeral 7 the charging device of a metal ingot, f 1 is the transport direction of the steel strip (sheet passing direction), f 2 direction of rotation of the sink roll, f 3 denotes a charging direction of the metal ingot.
【０００４】すなわち、鋼帯の連続溶融亜鉛めっき装置
など鋼帯の連続溶融金属めっき装置においては、鋼帯を
溶融金属であるめっき浴１中に連続的に進入させ、浴中
シンクロール３を周回後、方向転換し、めっき浴１浴面
より上方へ引き上げて連続的にめっきを施す。以下、溶
融金属めっきにおける従来技術を、鋼帯の連続溶融金属
めっきの代表例である溶融亜鉛めっきを例として説明す
る。That is, in a continuous hot-dip galvanizing apparatus for steel strip such as a continuous hot-dip galvanizing apparatus for steel strip, the steel strip is made to continuously enter a plating bath 1 which is a molten metal, and is circulated around a sink roll 3 in the bath. Thereafter, the direction is changed and the plating bath 1 is pulled upward from the bath surface to perform continuous plating. Hereinafter, a conventional technique in hot-dip metal plating will be described by taking hot-dip galvanizing, which is a typical example of continuous hot-dip metal plating of a steel strip, as an example.
【０００５】溶融亜鉛めっきにおいては、めっきによっ
て減少した溶融亜鉛をめっき浴１への亜鉛インゴット６
の投入によって補給している。この場合、投入された亜
鉛インゴットは溶融亜鉛との接触によって溶解する。溶
解した亜鉛は、周囲の溶融亜鉛に比べ低温、かつ、Feな
どの不純物を含まない溶融亜鉛であり、比重差で溶融亜
鉛浴内を沈降する。In hot-dip galvanizing, hot-dip zinc reduced by plating is applied to a zinc ingot 6 in a plating bath 1.
Is replenished by throwing in. In this case, the charged zinc ingot is melted by contact with molten zinc. The dissolved zinc is a molten zinc having a lower temperature than the surrounding molten zinc and containing no impurities such as Fe, and settles in the molten zinc bath at a specific gravity difference.
【０００６】この過程で、亜鉛インゴット周囲の溶融亜
鉛は低温の溶解亜鉛と接触して温度が低下する。亜鉛イ
ンゴット周囲の溶融亜鉛は、鋼帯から溶出したFeおよび
めっき助剤として添加するAlを含有し、上記した温度低
下によって、溶融亜鉛中のFe濃度が飽和溶解度を超える
と共に、Fe−Al濃度積がFe−Al飽和溶解度積を超える。[0006] During this process, the molten zinc around the zinc ingot comes into contact with the low-temperature molten zinc, and the temperature decreases. The molten zinc around the zinc ingot contains Fe eluted from the steel strip and Al added as a plating aid, and due to the above-mentioned temperature drop, the Fe concentration in the molten zinc exceeds the saturation solubility and the Fe-Al concentration product Exceeds the Fe—Al saturation solubility product.
【０００７】この結果、亜鉛インゴットの投入によっ
て、めっき浴中に、FeZn7 を主成分とする比重の重いボ
トムドロスおよび比重の軽いFe2Al5を主成分とする浮上
ドロス（以下、トップドロスとも記す）が生成し、ボト
ムドロスはめっき用ポット２内の底部に堆積し、浮上ド
ロス（：トップドロス）はめっき浴１上に浮上する。こ
の場合、ボトムドロスは、めっき浴１中のシンクロール
３を周回して搬送される鋼帯（ストリップ）４の随伴流
であるめっき液に巻き上げられて鋼帯４に付着する。[0007] As a result, by introducing a zinc ingot, a floating dross having a heavy specific gravity mainly composed of FeZn 7 and a floating dross mainly having a small specific gravity Fe 2 Al 5 (hereinafter also referred to as a top dross) are introduced into a plating bath. ) Is generated, the bottom dross is deposited on the bottom in the plating pot 2, and the floating dross (top dross) floats on the plating bath 1. In this case, the bottom dross is wound up by the plating solution which is an accompanying flow of the steel strip (strip) 4 conveyed around the sink roll 3 in the plating bath 1 and adheres to the steel strip 4.
【０００８】また、トップドロスは再度めっき液中に一
部巻き込まれ、上記と同様に鋼帯４に付着する。この結
果、製造されためっき鋼板のプレス成形時に、プレスブ
ツと称する表面不均一部分が生じ、鮮映性が損なわれる
ばかりでなく、付着ドロスが金型に損傷を与えるという
問題があり、めっき浴中のドロスを低減することが重要
な課題となる。In addition, the top dross is partially caught in the plating solution again and adheres to the steel strip 4 in the same manner as described above. As a result, at the time of press-forming the produced plated steel sheet, a non-uniform surface portion called a press spot occurs, and not only the sharpness is impaired, but also there is a problem that the adhered dross damages the mold, and the It is an important issue to reduce the dross.
【０００９】上記した問題を解決するため、亜鉛インゴ
ットの投入による亜鉛インゴット近傍の溶融亜鉛の温度
低下を抑制しつつめっきする溶融亜鉛めっき鋼板の製造
方法および該製造方法の具体的な方法として、投入する
亜鉛インゴットに溶融亜鉛流を当てる溶融亜鉛めっき鋼
板の製造方法、並びに製造装置が開示されている（特開
2000−144357公報参照）。In order to solve the above-mentioned problem, a method of manufacturing a hot-dip galvanized steel sheet which is plated while suppressing a temperature drop of molten zinc near the zinc ingot due to the charging of the zinc ingot, and a specific method of the manufacturing method are as follows. And a manufacturing apparatus for a hot-dip galvanized steel sheet in which a hot zinc flow is applied to a hot zinc ingot.
2000-144357).
【００１０】しかしながら、上記した方法および装置の
場合、溶融亜鉛流を亜鉛インゴットに当てても、亜鉛イ
ンゴットの表面では亜鉛の溶解温度である420 ℃と低温
になり、また亜鉛インゴットの周囲の溶融亜鉛も低温と
なる。この結果、亜鉛インゴットに当てられる溶融亜鉛
およびめっき浴中のシンクロールの回転および鋼帯の搬
送によって生じるめっき浴の流れに伴って亜鉛インゴッ
ト周囲の低温域に運ばれる溶融亜鉛それぞれに含まれる
Fe成分およびAl成分によって、前記したFeZn7 を主成分
とするボトムドロスおよびFe2Al5を主成分とするトップ
ドロスが生成する。However, in the case of the above-described method and apparatus, even if the molten zinc stream is applied to the zinc ingot, the temperature of the surface of the zinc ingot is as low as 420 ° C., which is the melting temperature of zinc, and the molten zinc around the zinc ingot is low. Will also be cold. As a result, the zinc contained in the molten zinc applied to the zinc ingot and the molten zinc transported to the low-temperature region around the zinc ingot with the flow of the plating bath caused by the rotation of the sink roll in the plating bath and the conveyance of the steel strip are included.
The above-described bottom dross mainly composed of FeZn 7 and top dross mainly composed of Fe 2 Al 5 are generated by the Fe component and the Al component.
【００１１】すなわち、上記した従来技術によっても、
ドロスの生成を効果的に抑制することは困難であり、鋼
帯へのドロス付着に基づく前記したプレス成形後のめっ
き鋼板の外観不良および金型の損傷が避けられなかっ
た。That is, according to the prior art described above,
It is difficult to effectively suppress the generation of dross, and the inferior appearance of the plated steel sheet after press forming and damage to the die due to the adhesion of dross to the steel strip cannot be avoided.
【００１２】[0012]
【発明が解決しようとする課題】本発明は、前記した従
来技術の問題点を解決し、鋼帯の連続溶融金属めっきに
おいて、簡易な装置で、めっき浴中のドロスの生成を効
果的に抑制することが可能な鋼帯の溶融金属めっき装置
を提供することを目的とする。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and effectively suppresses the generation of dross in a plating bath with a simple apparatus in continuous hot metal plating of steel strip. It is an object of the present invention to provide a steel strip hot-dip metal plating apparatus capable of performing the following.
【００１３】[0013]
【課題を解決するための手段】本発明は、鋼帯を溶融金
属であるめっき浴１中に連続的に進入させ溶融金属めっ
きを施すめっき用ポット２と、前記めっき浴１中で溶融
金属補給用金属インゴットの投入区域８を囲み上部が浴
面より上に突出した堰（せき）９と、該堰９に囲まれた
めっき浴１中の下部に設けられ、該堰９の内部のめっき
浴１I と外部のめっき浴１O とを連通するめっき液出口
11と、該堰９の内部のめっき浴１I 中に設けられ、めっ
き液の下方への流れに対する抵抗となる複数枚の抵抗板
101 〜10 n を有することを特徴とする鋼帯の溶融金属め
っき装置である。SUMMARY OF THE INVENTION The present invention relates to a method of forming a steel strip into molten metal.
Metal plating bath 1 and the molten metal
Plating pot 2 to be melted and melted in the plating bath 1
The upper part of the bath surrounds the metal ingot loading area 8 for metal supply.
A weir 9 that protrudes above the surface and is surrounded by the weir 9
The plating is provided at the lower portion of the plating bath 1 and is inside the weir 9.
Bath 1IAnd external plating bath 1OPlating solution outlet
11 and the plating bath 1 inside the weir 9IInside,
Multiple resistance plates that resist the downward flow of liquid
Ten1 ~Ten nMolten metal of steel strip characterized by having
It is a device.
【００１４】前記した本発明においては、前記した複数
枚の抵抗板101 〜10n の内の少なくとも１枚の抵抗板10
i が前記堰９の側壁面12A に取り付けられ、該抵抗板10
i と相対面する抵抗板10j が前記側壁面12A と相対する
側壁面12B 、14に取り付けられ、めっき液の下方への流
路13が屈曲状に形成されることが好ましい（本発明の第
１の好適態様）。[0014] In the present invention described above, at least one resistive plate 10 of a plurality of resistive plate 10 1 to 10 n mentioned above
i is attached to the side wall surface 12A of the weir 9 and the resistance plate 10
It is preferable that a resistance plate 10j facing the i side is attached to the side wall surfaces 12B and 14 facing the side wall surface 12A, and the flow path 13 below the plating solution is formed in a bent shape (the first aspect of the present invention). Preferred embodiment).
【００１５】さらに、前記した本発明、本発明の第１の
好適態様においては、前記堰９が、前記めっき浴１中に
浸漬配置され、上部が浴面より上に突出した筒状の堰９
であることが好ましい（本発明の第２の好適態様、第３
の好適態様）。なお、上記した本発明の第２の好適態
様、第３の好適態様における筒状の堰９の内壁の水平断
面形状は、四角形に限らず円形状など任意の形状を採用
することができる。Further, in the present invention and the first preferred embodiment of the present invention, the weir 9 is immersed in the plating bath 1 and has a cylindrical weir 9 whose upper part protrudes above the bath surface.
(The second preferred embodiment of the present invention, the third preferred embodiment)
Preferred embodiment). In addition, the horizontal cross-sectional shape of the inner wall of the cylindrical weir 9 in the above-described second preferred embodiment and the third preferred embodiment of the present invention is not limited to a square, but may be any shape such as a circle.
【００１６】[0016]
【発明の実施の形態】以下、本発明をさらに詳細に説明
する。本発明者らは前記した課題を解決するために鋭意
検討した結果、下記知見を見出し本発明に至った。すな
わち、鋼帯の溶融亜鉛めっき装置のめっき浴中で溶解し
た亜鉛は、周囲の溶融亜鉛に比べ低温、かつ、Feなどの
不純物を含まない溶融亜鉛であり、比重差で溶融亜鉛浴
内を沈降する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The present inventors have conducted intensive studies in order to solve the above-described problems, and as a result, have found the following findings and have reached the present invention. In other words, the zinc dissolved in the plating bath of the hot-dip galvanizing apparatus for steel strip is a molten zinc that is lower in temperature than the surrounding molten zinc and does not contain impurities such as Fe, and settles in the molten zinc bath due to a difference in specific gravity. I do.
【００１７】このため、溶融亜鉛補給用亜鉛インゴット
の投入区域を囲む堰（せき）を設けることによって、Fe
などの不純物を含まないインゴットの溶解によって生成
する溶解亜鉛がめっき浴中のFeおよびAlを含有する溶融
亜鉛と接触、混合することなく、堰の内部において下方
へ流動し、堰の内部のめっき浴と外部のめっき浴とを連
通するめっき液出口から外部のめっき浴中に供給され
る。For this reason, by providing a weir surrounding a charging area of the zinc ingot for replenishing the molten zinc, a weir is provided.
Dissolved zinc produced by dissolving ingots that do not contain impurities such as Fe and Al in the plating bath flows downward inside the weir without contacting and mixing with molten zinc containing Fe and Al, and the plating bath inside the weir The plating solution is supplied into the external plating bath from a plating solution outlet which communicates with the external plating bath.
【００１８】また、堰の内部のめっき浴中に、めっき液
（：溶解亜鉛）の下方への流れに対する抵抗となる複数
枚の抵抗板を設け、堰の内部を流下する溶解亜鉛の流速
を制限することによって、Feなどの不純物を含まない堰
の内部の溶解亜鉛と堰の外部のめっき浴との堰の器壁を
介する間接熱交換が促進される。この結果、十分昇温さ
れた溶解亜鉛がめっき浴中に供給され、めっき浴中のド
ロスの生成を効果的に抑制することが可能となる。Further, a plurality of resistance plates are provided in the plating bath inside the weir to provide resistance to the downward flow of the plating solution (: dissolved zinc), thereby limiting the flow rate of the molten zinc flowing down the inside of the weir. This promotes indirect heat exchange between the molten zinc inside the weir containing no impurities such as Fe and the plating bath outside the weir via the wall of the weir. As a result, the molten zinc that has been sufficiently heated is supplied into the plating bath, and it is possible to effectively suppress the generation of dross in the plating bath.
【００１９】図１に、本発明の鋼帯の溶融金属めっき装
置の一例を、縦断面図(a) およびＡ−Ａ方向矢視図(b)
によって示す。なお、図１において、１I は堰９の内部
のめっき浴、１O は堰９の外部のめっき浴、８は溶融金
属補給用金属インゴット（：亜鉛インゴットなどの金属
インゴット）６の投入区域、９は溶融金属補給用金属イ
ンゴット（：金属インゴット）６の投入区域８を囲む
堰、10は複数の抵抗板101 〜10n から構成される抵抗
板、11はめっき液出口、12A は堰９の側壁面、12B は側
壁面12A と相対する堰９の側壁面、13はめっき液の下方
への流路、f4は堰の内部の溶解金属の流れ方向、f5は堰
の外部のめっき浴における溶融金属の流れ方向を示し、
その他の符号は前記した図３と同一の内容を示す。FIG. 1 is a longitudinal sectional view (a) and an AA direction arrow view (b) of an example of a steel strip hot metal plating apparatus of the present invention.
Indicated by In FIG. 1, 1 I is a plating bath inside the weir 9, 1 O is a plating bath outside the weir 9, 8 is a charging area for a molten metal refill metal ingot (a metal ingot such as a zinc ingot) 6, 9 the molten metal replenishment metal ingot: dam surrounding the charged area 8 (metal ingot) 6, 10 resistive plate composed of a plurality of resistive plate 10 1 to 10 n, the plating solution outlet, 12A 11 weir 9 the side wall surface of, 12B is the side wall surface of the opposed dam 9 and the side wall surface 12A, 13 the flow path to the lower of the plating solution, f 4 is the interior of the molten metal in the flow direction of the weir, f 5 is weir external plating Indicates the flow direction of the molten metal in the bath,
Other symbols indicate the same contents as those in FIG.
【００２０】なお、図１に示すように、上記した堰９の
内部のめっき浴１I とは、堰９に囲まれた領域のめっき
浴を示し、堰９の外部のめっき浴１O とは、堰９に囲ま
れた領域の外部のめっき浴を示す。すなわち、図１に例
示した本発明の鋼帯の溶融金属めっき装置は、鋼帯を溶
融金属であるめっき浴１中に連続的に進入させ溶融金属
めっきを施すめっき用ポット２と、めっき用ポット２の
めっき浴１中で溶融金属補給用金属インゴットの投入区
域８を囲み上部が浴面より上に突出した堰９と、堰９に
囲まれためっき浴１中の下部に設けられ、堰９の内部の
めっき浴１I と外部のめっき浴１O とを連通するめっき
液出口11と、堰９の内部のめっき浴１I 中に設けられ、
めっき液の下方への流れに対する抵抗となる複数枚の抵
抗板101 〜10n を有する鋼帯の溶融金属めっき装置であ
る。As shown in FIG. 1, the plating bath 1 I inside the weir 9 described above indicates a plating bath in a region surrounded by the weir 9, and the plating bath 1 O outside the weir 9 is 3 shows a plating bath outside a region surrounded by the weir 9. That is, the molten metal plating apparatus for a steel strip of the present invention illustrated in FIG. 1 comprises a plating pot 2 for continuously entering a steel strip into a plating bath 1 which is a molten metal to perform molten metal plating, and a plating pot. A weir 9 surrounding the charging area 8 for the metal ingot for replenishing molten metal in the plating bath 1 and having an upper part protruding above the bath surface; and a weir 9 provided at the lower part of the plating bath 1 surrounded by the weir 9. the plating solution outlet 11 inside of the plating bath 1 O plating bath 1 I and the external communicating, provided in the interior of the plating bath 1 I weir 9,
A molten metal plating apparatus of the steel strip having a plurality of resistive plate 10 1 to 10 n as a resistance to flow downward in the plating solution.
【００２１】本発明の鋼帯の溶融金属めっき装置の基本
構成は、下記(1) 、(2) である。 (1) 金属インゴット投入、溶解区域を囲む堰 (2) 堰の内部のめっき浴中に設けた複数枚の抵抗板 本発明によれば、例えば、鋼帯の溶融金属めっき装置の
代表例である鋼帯の溶融亜鉛めっき装置において、亜鉛
インゴットの投入区域を囲む堰を設けることによって、
Feなどの不純物を含まないインゴットの溶解によって生
成する溶解亜鉛が、めっき浴中のFeおよびAlを含有する
溶融亜鉛と接触、混合することなく、堰の内部において
下方へ流動し、堰の内部のめっき浴と外部のめっき浴と
を連通するめっき液出口から外部のめっき浴中に供給さ
れる。The basic configuration of the steel strip hot-dip metal plating apparatus of the present invention is as follows (1) and (2). (1) Metal ingot charging, weir surrounding the melting area (2) Plurality of resistance plates provided in a plating bath inside the weir According to the present invention, for example, a representative example of a steel strip hot-dip metal plating apparatus In the hot-dip galvanizing equipment for steel strip, by providing a weir surrounding the input area of the zinc ingot,
Dissolved zinc produced by the dissolution of ingots that do not contain impurities such as Fe contacts and mixes with molten zinc containing Fe and Al in the plating bath, flows downward inside the weir, and flows inside the weir. The plating solution is supplied into the external plating bath from a plating solution outlet communicating the plating bath with the external plating bath.
【００２２】また、堰の内部のめっき浴中に、めっき液
（：溶解亜鉛）の下方への流れに対する抵抗となる複数
枚の抵抗板を設け、堰の内部を流下する溶解亜鉛の流速
を制限することによって、Feなどの不純物を含まない堰
の内部の溶解亜鉛と堰の外部のめっき浴との堰の器壁を
介する間接熱交換が促進される。この結果、十分昇温さ
れた溶解亜鉛がめっき浴中に供給され、めっき浴中のFe
およびAlを含有する溶融亜鉛と低温の溶解亜鉛および低
温の亜鉛インゴットとの接触によるドロス生成を効果的
に抑制することが可能となる。In the plating bath inside the weir, there are provided a plurality of resistance plates which provide resistance to the downward flow of the plating solution (: dissolved zinc) to limit the flow rate of the molten zinc flowing down the inside of the weir. This promotes indirect heat exchange between the molten zinc inside the weir containing no impurities such as Fe and the plating bath outside the weir via the wall of the weir. As a result, the molten zinc that has been sufficiently heated is supplied into the plating bath, and the Fe in the plating bath is
Dross formation due to contact between molten zinc containing Al and Al and low-temperature molten zinc and low-temperature zinc ingot can be effectively suppressed.
【００２３】さらに、図１に示すように、本発明の好適
態様においては、複数枚の抵抗板10 1 〜10n の内の少な
くとも１枚の抵抗板10i を堰９の側壁面12A に取り付
け、該抵抗板10i と相対面する抵抗板10j を側壁面12A
と相対する側壁面12B に取り付け、めっき液の下方への
流路13を屈曲状に形成する。上記した本発明の好適態様
によれば、堰の内部を流下する溶解亜鉛が堰の器壁と接
触する確率がより増大し、前記した堰の内部の溶解亜鉛
と堰の外部のめっき浴との堰の器壁を介する間接熱交換
がさらに促進され、堰の外部のめっき浴との温度差がよ
り小さい溶解亜鉛がめっき液出口11から堰の外部のめっ
き浴中に供給される。Further, as shown in FIG.
In the embodiment, the plurality of resistance plates 10 1 ~TennFew of
At least one resistor plate 10i is attached to the side wall 12A of the weir 9.
The resistance plate 10j facing the resistance plate 10i is attached to the side wall surface 12A.
To the side wall surface 12B opposite to
The channel 13 is formed in a bent shape. Preferred embodiments of the present invention described above
According to the above, the molten zinc flowing down inside the weir contacts the wall of the weir.
The probability of touch is increased, and the molten zinc inside the weir described above
Heat exchange with the plating bath outside of the weir through the wall of the weir
Is further promoted, and the temperature difference with the plating bath outside the weir is improved.
Dissolved zinc, which is as small as
Supplied during the bath.
【００２４】この結果、めっき浴中のドロスの生成をさ
らに効果的に抑制することが可能となると共に、堰を小
型化できる。さらに、図１に示すように、本発明のさら
なる好適態様においては、堰９として、筒状の堰９をめ
っき用ポット２のめっき浴１中に浸漬配置する。上記し
た本発明のさらなる好適態様によれば、筒状の堰９の全
周が、外部の高温のめっき浴に包囲されるため、前記し
た堰の内部の溶解亜鉛と堰の外部のめっき浴との堰の器
壁を介する間接熱交換がさらに一層促進され、堰の外部
のめっき浴との温度差がさらに小さい溶解亜鉛がめっき
液出口11から堰の外部のめっき浴中に供給される。As a result, it is possible to more effectively suppress the generation of dross in the plating bath and to reduce the size of the weir. Further, as shown in FIG. 1, in a further preferred embodiment of the present invention, as the weir 9, a cylindrical weir 9 is immersed in the plating bath 1 of the plating pot 2. According to the further preferred embodiment of the present invention described above, the entire periphery of the cylindrical weir 9 is surrounded by the external high-temperature plating bath, so that the molten zinc inside the weir and the plating bath outside the weir are not covered by the hot water. Indirect heat exchange through the wall of the weir is further promoted, and molten zinc having a smaller temperature difference from the plating bath outside the weir is supplied from the plating solution outlet 11 into the plating bath outside the weir.
【００２５】この結果、めっき浴中のドロス生成をさら
に一層効果的に抑制することが可能となる。なお、図１
に示す筒状の堰９は、内壁の水平断面形状が四角形の堰
９であるが、上記した本発明のさらなる好適態様におい
ては、筒状の堰９の内壁の水平断面形状は、任意の形状
を採用することができる。As a result, dross generation in the plating bath can be more effectively suppressed. FIG.
Is a weir 9 whose horizontal cross-sectional shape of the inner wall is a square, but in a further preferred embodiment of the present invention described above, the horizontal cross-sectional shape of the inner wall of the cylindrical weir 9 is arbitrary. Can be adopted.
【００２６】次に、図２に、本発明の鋼帯の溶融金属め
っき装置の他の一例を、縦断面図(a) およびＢ−Ｂ方向
矢視図(b) によって示す。なお、図２において、14はめ
っき用ポット２の側壁面を示し、その他の符号は、前記
した図１、図３と同一の内容を示す。すなわち、本発明
においては、前記した図１に示すように、堰９として、
筒状の堰９をめっき用ポット２のめっき浴１中に浸漬配
置し、筒状の堰９の側壁全周が、外部の高温のめっき浴
に包囲されるように浸漬配置することが好ましいが、図
２に示すように、堰の一部をめっき用ポット２の側壁面
14で構成してもよい。Next, FIG. 2 shows another example of a steel strip hot-dip metal plating apparatus of the present invention by a longitudinal sectional view (a) and a view taken in the direction of arrows BB (b). In FIG. 2, reference numeral 14 indicates a side wall surface of the plating pot 2, and other reference numerals indicate the same contents as those in FIGS. That is, in the present invention, as shown in FIG.
It is preferable that the cylindrical weir 9 is immersed and arranged in the plating bath 1 of the plating pot 2 and that the entire periphery of the side wall of the cylindrical weir 9 is immersed and arranged so as to be surrounded by an external high-temperature plating bath. As shown in FIG. 2, a part of the weir is formed on the side wall surface of the plating pot 2.
14 may be used.
【００２７】なお、この場合、通常めっき用ポット２の
側壁面14に取り付けられる図示されないめっき浴加熱用
のヒータを、堰の内部の溶解亜鉛の昇温用の熱源の一部
として用いることができる。以上、本発明の鋼帯の溶融
金属めっき装置について説明したが、本発明によれば、
簡易な装置で、めっき浴中のドロスの生成を効果的に抑
制することが可能な鋼帯の溶融金属めっき装置を提供す
ることが可能となった。In this case, a heater (not shown) for heating the plating bath which is usually attached to the side wall surface 14 of the plating pot 2 can be used as a part of the heat source for raising the temperature of the molten zinc inside the weir. . As described above, the steel strip hot-dip plating apparatus of the present invention has been described.
With a simple apparatus, it has become possible to provide a steel strip hot-dip metal plating apparatus capable of effectively suppressing the generation of dross in a plating bath.
【００２８】なお、本発明の鋼帯の溶融金属めっき装置
の溶融金属としては、溶融亜鉛に限定されることはな
く、亜鉛を主成分とする溶融（亜鉛−アルミ：Zn-Al
）、アルミを主成分とする溶融（アルミ−亜鉛：Al-Zn
）など、溶融亜鉛以外の溶融金属を用いることもでき
る。すなわち、本発明は、前記した本発明の作用、効果
に基づき、溶融亜鉛以外の溶融金属を用いた鋼帯の溶融
金属めっき装置としても好適に用いることができる。The molten metal of the steel strip hot metal plating apparatus of the present invention is not limited to molten zinc, but may be a molten metal containing zinc as a main component (zinc-aluminum: Zn-Al
), Aluminum-based melting (aluminium-zinc: Al-Zn)
) Can be used. That is, the present invention can be suitably used as a hot-dip metal plating apparatus for a steel strip using a molten metal other than hot-dip zinc, based on the above-described functions and effects of the present invention.
【００２９】[0029]
【実施例】以下、本発明を実施例に基づいてさらに具体
的に説明する。 （実施例）前記した図１に示す本発明の鋼帯の溶融金属
めっき装置を用い、亜鉛インゴットを、堰９の内部のめ
っき浴１I 中に投入し、下記条件下で鋼帯への連続溶融
亜鉛めっきを行った。EXAMPLES The present invention will be described below more specifically based on examples. (Embodiment) Using a steel strip hot-dip metal plating apparatus of the present invention shown in FIG. 1 described above, a zinc ingot was charged into a plating bath 1 I inside a weir 9 and continuously applied to the steel strip under the following conditions. Hot-dip galvanizing was performed.
【００３０】なお、堰９としては、堰９の内容積を亜鉛
インゴットの体積の２倍とした堰を用いて試験を行っ
た。 （溶融亜鉛めっきの条件：） 鋼帯：冷延鋼板（板厚：0.4 〜1.6mm ×板幅：750 〜18
50mm） 溶融亜鉛めっき浴進入板温：470 〜480 ℃ 溶融亜鉛めっき浴Al濃度 ：0.13〜0.15％ 通板速度 ：30〜150m/min また、上記試験において、ボトムドロスおよびトップド
ロスの生成量を下記方法で測定すると共に、堰９のめっ
き液出口11のめっき浴のFe濃度を測定した。The test was carried out using a weir 9 whose inner volume was twice the volume of the zinc ingot. (Conditions for hot-dip galvanizing :) Steel strip: cold-rolled steel sheet (sheet thickness: 0.4 to 1.6 mm x sheet width: 750 to 18)
50mm) Hot-dip galvanizing bath entry plate temperature: 470 to 480 ° C Hot-dip galvanizing bath Al concentration: 0.13 to 0.15% Passing speed: 30 to 150m / min In the above test, the amount of bottom dross and top dross generated is determined by the following method. And the Fe concentration of the plating bath at the plating solution outlet 11 of the weir 9 was measured.
【００３１】（ボトムドロスおよびトップドロスの生成
量の測定方法：） ボトムドロス生成量の測定方法：めっき浴１（１O ）の
底部から溶融亜鉛をサンプリングし、急冷した。次に、
得られた金属亜鉛の断面をエッチングし、断面を顕微鏡
観察し、20μm以上の大きさのドロスを計数した。(Method for measuring the amount of bottom dross and top dross generated): Method for measuring the amount of bottom dross generated: Molten zinc was sampled from the bottom of plating bath 1 (1 O ) and quenched. next,
The cross section of the obtained metal zinc was etched, the cross section was observed under a microscope, and dross having a size of 20 μm or more was counted.
【００３２】トップドロス生成量の測定方法：めっき浴
１（１O ）の上部表面に浮上したドロスを数カ所から10
cm角の大きさのフィルタで濾しとり、その重量を平均し
た。得られた試験結果を表１に示す。なお、表１におけ
るドロス生成量、堰９のめっき液出口11のめっき浴のFe
濃度は、下記に示す比較例におけるドロス生成量、投入
亜鉛インゴット近傍のめっき浴のFe濃度を、それぞれ1.
00、１として、相対値で示した。Method for measuring the amount of top dross generated: dross floating on the upper surface of plating bath 1 (1 O ) was measured at 10 places from several places.
It was filtered with a filter having a size of cm square, and the weight was averaged. Table 1 shows the obtained test results. The amount of dross generated in Table 1 and the amount of Fe in the plating bath at the plating solution outlet 11 of the weir 9 were measured.
Concentration, dross generation amount in the comparative example shown below, Fe concentration of the plating bath near the input zinc ingot, 1.
00 and 1 are shown as relative values.
【００３３】（比較例）前記した図３に示す従来の溶融
金属めっき装置を用い、前記した実施例と同一の条件下
で鋼帯への連続溶融亜鉛めっきを行った。また、前記し
た実施例と同一の方法でボトムドロスおよびトップドロ
スの生成量を測定すると共に、投入亜鉛インゴット近傍
のめっき浴のFe濃度を測定した。(Comparative Example) Continuous hot-dip galvanizing on a steel strip was performed using the conventional hot-dip galvanizing apparatus shown in FIG. 3 under the same conditions as in the above-described embodiment. Further, the amounts of bottom dross and top dross generated were measured in the same manner as in the above-described example, and the Fe concentration of the plating bath near the charged zinc ingot was measured.
【００３４】得られた試験結果を表１に示す。なお、前
記したように、表１におけるドロス生成量、めっき浴の
Fe濃度は、本比較例におけるドロス生成量、投入亜鉛イ
ンゴット近傍のめっき浴のFe濃度を、それぞれ1.00、１
として示す。表１に示されるように、本発明の鋼帯の溶
融金属めっき装置によれば、Fe濃度が低い低温の溶解亜
鉛を高温状態でめっき浴中に供給できるため、めっき浴
中のドロスの生成を効果的に抑制することが可能となっ
た。Table 1 shows the obtained test results. As described above, the dross generation amount in Table 1 and the plating bath
The Fe concentration was 1.00, 1 for the dross generation amount and the Fe concentration of the plating bath near the input zinc ingot in this comparative example, respectively.
As shown. As shown in Table 1, according to the steel strip hot-dip metal plating apparatus of the present invention, the low-concentration molten zinc having a low Fe concentration can be supplied to the plating bath in a high-temperature state. It became possible to suppress it effectively.
【００３５】さらに、本発明の鋼帯の溶融金属めっき装
置は、内部に抵抗板を設けた堰を配設するのみでよいた
め、極めて簡易な装置でめっき浴中のドロスの生成を抑
制することが可能となった。Furthermore, since the steel strip hot-dip metal plating apparatus of the present invention only needs to provide a weir provided with a resistance plate inside, it is possible to suppress the generation of dross in the plating bath with an extremely simple apparatus. Became possible.
【００３６】[0036]
【表１】 [Table 1]
【００３７】[0037]
【発明の効果】本発明によれば、極めて簡易な装置で、
めっき浴中のドロスの生成を効果的に抑制することが可
能となった。According to the present invention, an extremely simple device can be used.
It has become possible to effectively suppress the generation of dross in the plating bath.
【図１】本発明の鋼帯の溶融金属めっき装置の一例を示
す縦断面図(a) およびＡ−Ａ方向矢視図(b) である。FIG. 1 is a longitudinal sectional view (a) and an AA direction arrow view (b) showing an example of a steel strip hot-dip metal plating apparatus of the present invention.
【図２】本発明の鋼帯の溶融金属めっき装置の一例を示
す縦断面図(a) およびＢ−Ｂ方向矢視図(b) である。FIG. 2 is a longitudinal sectional view (a) and a view taken in the direction of arrows BB (b) showing an example of a steel strip hot-dip metal plating apparatus of the present invention.
【図３】従来の鋼帯の溶融金属めっき装置を示す縦断面
図である。FIG. 3 is a longitudinal sectional view showing a conventional steel strip hot-dip metal plating apparatus.
１ めっき浴 １I 堰の内部のめっき浴 １O 堰の外部のめっき浴 ２ めっき用ポット ３ シンクロール ４ 鋼帯 ５ スナウト ６ 溶融金属補給用金属インゴット（：亜鉛インゴット
などの金属インゴット） ７ 金属インゴットの装入装置 ８ 金属インゴットの投入区域 ９ 金属インゴットの投入区域を囲む堰 10、101 〜10n 抵抗板 11 めっき液出口 12A 堰の側壁面 12B 側壁面12A と相対する堰の側壁面 13 めっき液の下方への流路 14 めっき用ポットの側壁面 f1 鋼帯の搬送方向（通板方向） f2 シンクロールの回転方向 f3 金属インゴットの投入方向 f4 堰の内部の溶解金属（溶解亜鉛）の流れ方向 f5 堰の外部のめっき浴における溶融金属（溶融亜鉛）
の流れ方向DESCRIPTION OF SYMBOLS 1 Plating bath 1 Plating bath inside I dam 1 Plating bath outside O dam 2 Plating pot 3 Sink roll 4 Steel strip 5 Snout 6 Metal ingot for replenishing molten metal (: metal ingot such as zinc ingot) 7 Metal ingot Charging device 8 Metal ingot charging area 9 Weir surrounding metal ingot charging area 10, 10 1 to 10 n Resistor plate 11 Plating solution outlet 12A Weir side wall 12B Side wall surface of weir opposite to side wall surface 12A 13 Plating Channel below the solution 14 Side wall surface of plating pot f 1 Transport direction of steel strip (passing direction) f 2 Rotation direction of sink roll f 3 Direction of loading metal ingot f 4 Dissolved metal inside dam Flow direction of zinc) f 5 Molten metal in the plating bath outside the weir (molten zinc)
Flow direction
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田野口 一郎 岡山県倉敷市水島川崎通１丁目（番地な し） 川崎製鉄株式会社水島製鉄所内 (72)発明者 亀谷 岳文 岡山県倉敷市水島川崎通１丁目（番地な し） 川崎製鉄株式会社水島製鉄所内 Ｆターム(参考） 4K027 AA02 AA22 AD08 AE04 AE06 AE08 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ichiro Tanoguchi 1-chome, Mizushima-Kawasaki-dori, Kurashiki-shi, Okayama Pref. Chome (without address) Kawasaki Steel Corporation Mizushima Works F-term (reference) 4K027 AA02 AA22 AD08 AE04 AE06 AE08
Claims (3)
連続的に進入させ溶融金属めっきを施すめっき用ポット
(2) と、前記めっき浴(1) 中で溶融金属補給用金属イン
ゴットの投入区域(8) を囲み上部が浴面より上に突出し
た堰(9) と、該堰(9) に囲まれためっき浴(1) 中の下部
に設けられ、該堰(9) の内部のめっき浴(1I ) と外部の
めっき浴(1O ) とを連通するめっき液出口(11)と、該堰
(9) の内部のめっき浴(1I ) 中に設けられ、めっき液の
下方への流れに対する抵抗となる複数枚の抵抗板(101〜
10n ) を有することを特徴とする鋼帯の溶融金属めっき
装置。1. A plating pot for continuously entering a steel strip into a molten metal plating bath (1) to perform molten metal plating.
(2), a weir (9) surrounding the charging area (8) for the metal ingot for replenishing molten metal in the plating bath (1), and an upper part protruding above the bath surface, and a weir (9). A plating solution outlet (11) provided at a lower portion of the plating bath (1) for communicating the plating bath (1 I ) inside the weir (9) with the external plating bath (1 O );
A plurality of resistance plates (10 1 to 10) provided in the plating bath (1 I ) inside (9) and serving as a resistance against the downward flow of the plating solution.
10 n ). A hot-dip metal plating apparatus for a steel strip, characterized in that
内の少なくとも１枚の抵抗板(10i) が前記堰(9) の側壁
面(12A) に取り付けられ、該抵抗板(10i) と相対面する
抵抗板(10j) が前記側壁面(12A) と相対する側壁面(12
B,14)に取り付けられ、めっき液の下方への流路(13)が
屈曲状に形成されたことを特徴とする請求項１記載の鋼
帯の溶融金属めっき装置。2. At least one of the plurality of resistance plates (10 1 to 10 n ) is attached to a side wall surface (12A) of the weir (9). The resistance plate (10j) facing the side wall (10i) faces the side wall (12A).
2. The hot-dip metal strip plating apparatus for steel strip according to claim 1, wherein the apparatus is attached to the metal plate (B, 14) and the flow path (13) downward of the plating solution is formed in a bent shape.
漬配置され、上部が浴面より上に突出した筒状の堰(9)
であることを特徴とする請求項１または２記載の鋼帯の
溶融金属めっき装置。3. The weir (9) is immersed and arranged in the plating bath (1), and has a cylindrical weir (9) having an upper part protruding above the bath surface.
The hot-dip steel strip metal plating apparatus according to claim 1 or 2, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001002750A JP2002212696A (en) | 2001-01-10 | 2001-01-10 | Hot dip metal coating device for band steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001002750A JP2002212696A (en) | 2001-01-10 | 2001-01-10 | Hot dip metal coating device for band steel |
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| Publication Number | Publication Date |
|---|---|
| JP2002212696A true JP2002212696A (en) | 2002-07-31 |
Family
ID=18871201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001002750A Pending JP2002212696A (en) | 2001-01-10 | 2001-01-10 | Hot dip metal coating device for band steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007039763A (en) * | 2005-08-04 | 2007-02-15 | Jfe Steel Kk | Hot dip plating device, and method for operating hot dip plating device |
| JP2009228073A (en) * | 2008-03-24 | 2009-10-08 | Jfe Steel Corp | Method for manufacturing hot dip coated steel sheet |
| KR101341738B1 (en) * | 2011-12-02 | 2013-12-16 | 현대하이스코 주식회사 | Ingot feeding equipment and method of manufacturing in continuous hot-dip galvanized steel sheet for outer panel |
| KR101499319B1 (en) * | 2013-05-02 | 2015-03-05 | 현대제철 주식회사 | Apparatus for manufacturing galvanized steel-sheet and monitoring equipment for manufacturing galvanized steel-sheet |
| CN110484846A (en) * | 2019-09-05 | 2019-11-22 | 常州大学 | A kind of improvement continuous hot-dipping zinc-aluminium zinc pond temperature field and the device at branch |
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2001
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007039763A (en) * | 2005-08-04 | 2007-02-15 | Jfe Steel Kk | Hot dip plating device, and method for operating hot dip plating device |
| JP4692132B2 (en) * | 2005-08-04 | 2011-06-01 | Ｊｆｅスチール株式会社 | Hot dipping apparatus and method of operating hot dipping apparatus |
| JP2009228073A (en) * | 2008-03-24 | 2009-10-08 | Jfe Steel Corp | Method for manufacturing hot dip coated steel sheet |
| KR101341738B1 (en) * | 2011-12-02 | 2013-12-16 | 현대하이스코 주식회사 | Ingot feeding equipment and method of manufacturing in continuous hot-dip galvanized steel sheet for outer panel |
| KR101499319B1 (en) * | 2013-05-02 | 2015-03-05 | 현대제철 주식회사 | Apparatus for manufacturing galvanized steel-sheet and monitoring equipment for manufacturing galvanized steel-sheet |
| CN110484846A (en) * | 2019-09-05 | 2019-11-22 | 常州大学 | A kind of improvement continuous hot-dipping zinc-aluminium zinc pond temperature field and the device at branch |
| CN110484846B (en) * | 2019-09-05 | 2021-07-27 | 常州大学 | Device for improving temperature field and component field of continuous hot dip galvanizing aluminum zinc pool |
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