JP2006265666A - Continuous hot dip metal coating apparatus - Google Patents

Continuous hot dip metal coating apparatus Download PDF

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JP2006265666A
JP2006265666A JP2005087216A JP2005087216A JP2006265666A JP 2006265666 A JP2006265666 A JP 2006265666A JP 2005087216 A JP2005087216 A JP 2005087216A JP 2005087216 A JP2005087216 A JP 2005087216A JP 2006265666 A JP2006265666 A JP 2006265666A
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plating bath
molten metal
steel strip
plating
snout
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JP4961675B2 (en
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Koji Iwata
好司 岩田
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JFE Steel Corp
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JFE Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a continuous hot dip metal metal coating apparatus for a steel strip capable of preventing the occurrence of a quality defect. <P>SOLUTION: The apparatus comprises a pot for housing a plating bath, a snout for continuously admitting the steel strip into the plating bath, and a sink roll for turning the direction of the steel strip and pulling the steel strip upward from the plating bath surface. Further, a wave motion suppressing plate is exchangeably placed so as to cover at least a portion of the bath surface of the plating bath. As a result, the wave motion of the plating bath surface is suppressed and the adhesion of the dross of the molten metal, oxides, foreign substances, etc., in the snout is prevented and the hot dip metal coated steel strip with the reduced generation of the quality defects can be manufactured. The wave motion suppressing plate preferably has an oxidation prevention function of the molten metal and/or a thermal insulation function of the molten metal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、鋼帯の連続溶融金属めっき装置に係り、とくに溶融金属のドロス、酸化物等の付着に起因する鋼帯の品質欠陥の発生を防止することが可能な、連続溶融金属めっき装置に関する。     The present invention relates to a continuous molten metal plating apparatus for a steel strip, and more particularly to a continuous molten metal plating apparatus capable of preventing the occurrence of quality defects in a steel strip caused by adhesion of molten metal dross, oxides, and the like. .

鋼帯の連続溶融金属めっきにおいては、鋼帯は、大気遮断のためにスナウト13を介してめっき浴11中に連続的に侵入し、めっき浴11中に配設したシンクロール14を周回したのち、方向転換してめっき浴浴面より上方に引き上げられて、連続的にめっきを施されている。図２に、一般的な連続溶融金属めっき装置１を縦断面図で示す。なお、図２では、めっき浴補充用に金属インゴット15を溶融するプリメルトポット12aが付設されている。   In continuous molten metal plating of steel strip, the steel strip continuously penetrates into the plating bath 11 through the snout 13 to shut off the atmosphere, and then circulates the sink roll 14 disposed in the plating bath 11. The direction is changed and the plating bath is lifted upward from the bath surface and continuously plated. FIG. 2 is a longitudinal sectional view of a general continuous molten metal plating apparatus 1. In FIG. 2, a pre-melt pot 12a for melting the metal ingot 15 is provided for supplementing the plating bath.

従来から、溶融金属めっき鋼帯では、表面にドロスや、溶融金属の酸化物あるいは異物等が付着することにより発生する、品質欠陥が問題となっていた。これら品質欠陥は、スナウト内のめっき浴面に生成、成長したFe２Al３を主成分とするドロスや溶融金属の酸化物がめっき浴面に発生する波により浮遊して、あるいはスナウト内面のめっき浴面近傍に付着、成長する鋼帯とともに持ち込まれるスケール、耐火物等の異物がめっき浴面に発生する波によりスナウトから剥離し、めっき浴面上を浮遊して、鋼帯表面に付着して発生するといわれている。 Conventionally, in the molten metal-plated steel strip, there has been a problem of quality defects caused by dross, molten metal oxide or foreign matter adhering to the surface. These quality defects are generated on the plating bath surface in the snout, floated by waves generated on the plating bath surface by dross and molten metal oxides mainly composed of Fe 2 Al 3 , or plating on the inner surface of the snout Foreign matter such as scales and refractories brought in along with the growing steel strip adheres to the bath surface and peels off from the snout due to waves generated on the plating bath surface, floats on the plating bath surface, adheres to the steel strip surface It is said to occur.

このような品質欠陥の発生防止対策として、例えば、特許文献１には、めっき金属補給用のインゴットをめっき浴に投入する前に、めっき浴面とスナウトの相対レベルを変化させ、インゴット投入後にこの相対レベルを元のレベルに戻す溶融金属めっき法が提案されている。特許文献１に記載された方法では、めっき浴面とスナウトの相対レベルの変化は、めっき浴面の相対的低下によるのが好ましいとされ、その具体的方法として、スナウトの上昇、ダミーインゴットの引き上げによる実めっき浴面の低下、サブタンクへの一時的なめっき浴の移送による実めっき浴面の低下等を採用することができるとしている。しかしながら、インゴットの投入前後でめっき浴面の変動が大きいため、特許文献１に記載された方法では、その相対レベルの変化を制御することが非常に困難になるという問題があった。   As a countermeasure for preventing the occurrence of such quality defects, for example, in Patent Document 1, the relative level between the plating bath surface and the snout is changed before the ingot for replenishing the plating metal is put into the plating bath. There has been proposed a molten metal plating method for returning the relative level to the original level. In the method described in Patent Document 1, it is preferable that the change in the relative level between the plating bath surface and the snout is due to the relative decrease in the plating bath surface, and specific examples of the method include raising the snout and raising the dummy ingot. The actual plating bath surface can be lowered by the above, or the actual plating bath surface can be lowered by temporarily transferring the plating bath to the sub tank. However, since the plating bath surface largely fluctuates before and after the ingot is charged, the method described in Patent Document 1 has a problem that it is very difficult to control the change in the relative level.

また、特許文献２には、スナウト内のめっき浴面の波動を測定し、得られた測定結果に基づき、この波動を消去する振動を、スナウトおよびスナウト内のめっき浴中に設置した振動板に付与する溶融金属めっき方法が提案されている。しかしながら、特許文献２に記載された方法では、めっき浴面の波動を測定するためのセンサーの感度を適正値に調整することが難しいという問題や、振動板に付着したドロス、酸化物の洗浄が容易でないという問題があった。
特開平４−308070号公報 特開2001−303224号公報 In Patent Document 2, the vibration of the plating bath surface in the snout is measured, and based on the obtained measurement result, vibration for eliminating the wave is applied to the diaphragm installed in the plating bath in the snout and the snout. A molten metal plating method to be applied has been proposed. However, in the method described in Patent Document 2, there is a problem that it is difficult to adjust the sensitivity of the sensor for measuring the wave motion of the plating bath surface to an appropriate value, and the cleaning of dross and oxide adhering to the diaphragm is not performed. There was a problem that it was not easy.
Japanese Unexamined Patent Publication No. 4-308070 JP 2001-303224 A

本発明は、上記した従来技術の問題を解決し、溶融金属のドロス、酸化物や異物等の付着に起因する品質欠陥の発生を防止することが可能な、鋼帯の連続溶融金属めっき装置を提供することを目的とする。   The present invention provides a continuous molten metal plating apparatus for a steel strip that solves the above-described problems of the prior art and can prevent the occurrence of quality defects due to adhesion of molten metal dross, oxides and foreign matters. The purpose is to provide.

本発明者らは、上記した課題を達成するために、溶融金属めっき装置におけるめっき浴面の波動に影響する要因について鋭意研究した。その結果、スナウト内の波動は、めっき浴の浴面上に板状体を浮いた状態で配設することにより、抑制できることを知見した。
本発明は、上記した知見に基づいてさらに検討を加えて完成されたものである。すなわち、本発明の要旨は、つぎのとおりである。 In order to achieve the above-described problems, the present inventors diligently studied the factors that affect the wave motion of the plating bath surface in the molten metal plating apparatus. As a result, it was found that the wave motion in the snout can be suppressed by arranging the plate-like body in a floating state on the bath surface of the plating bath.
The present invention has been completed by further studies based on the above-described findings. That is, the gist of the present invention is as follows.

（１）溶融金属であるめっき浴を収納するポットと、該めっき浴中に一部を浸漬して配設され鋼帯を該めっき浴中に連続的に進入させるためのスナウトと、前記めっき浴中に浸漬配設され該めっき浴に進入させた前記鋼帯を方向転換させ該めっき浴浴面より上方に引き上げるためのシンクロールと、を有する溶融金属めっき装置であって、前記めっき浴の浴面の少なくとも一部を覆うように波動抑制板を交換可能に配設することを特徴とする連続溶融亜鉛めっき装置。
（２）（１）において、前記波動抑制板が、溶融金属の酸化防止機能を有することを特徴とする連続溶融亜鉛めっき装置。
（３）（１）または（２）において、前記波動抑制板が、溶融金属の保温機能を有することを特徴とする連続溶融亜鉛めっき装置。 (1) A pot for storing a plating bath that is a molten metal, a snout that is disposed by immersing a part in the plating bath, and allows a steel strip to continuously enter the plating bath, and the plating bath A molten metal plating apparatus having a sink roll for turning the steel strip that has been immersed therein and entered into the plating bath to pull up above the plating bath surface. A continuous hot-dip galvanizing apparatus, wherein a wave suppression plate is disposed so as to be exchangeable so as to cover at least a part of the surface.
(2) The continuous hot dip galvanizing apparatus according to (1), wherein the wave suppression plate has a function of preventing molten metal from being oxidized.
(3) The continuous galvanizing apparatus according to (1) or (2), wherein the wave suppression plate has a function of keeping molten metal warm.

本発明によれば、めっき浴面の波動が抑制され、スナウト内での溶融金属のドロス、酸化物や異物等の付着が抑制でき、品質欠陥の発生が少ない溶融金属めっき鋼帯を製造でき、歩留向上、生産効率の向上など、産業上格段の効果を奏する。また、本発明によれば、めっき浴浴面近傍での温度低下が少なくなり、めっき浴浴面近傍でのドロスの生成、成長が少なくなるという効果もある。なお、本発明は、溶融金属として、溶融亜鉛、亜鉛を主成分とする溶融Zn−Al合金、Alを主成分とする溶融Al−Zn合金、およびそれ以外の溶融金属などが、いずれも好適に用いることができる。   According to the present invention, wave motion of the plating bath surface is suppressed, dross of molten metal in the snout, adhesion of oxides and foreign matters can be suppressed, and a molten metal plated steel strip with less quality defects can be produced, There are remarkable industrial effects such as improved yield and improved production efficiency. Further, according to the present invention, there is an effect that the temperature drop near the plating bath surface is reduced, and the generation and growth of dross near the plating bath surface are reduced. In the present invention, as the molten metal, any of molten zinc, a molten Zn-Al alloy containing zinc as a main component, a molten Al-Zn alloy containing Al as a main component, and other molten metals is preferable. Can be used.

本発明の溶融金属めっき装置１は、溶融金属であるめっき浴11を収納するポット12と、該めっき浴11中に一部を浸漬して配設され鋼帯Ｓを該めっき浴中に連続的に侵入させるためのスナウト13と、前記めっき浴11中に浸漬配設され該めっき浴に侵入させた前記鋼帯Sを方向転換させ該めっき浴浴面11aより上方に引き上げるためのシンクロール14と、を有し、さらに、めっき浴面11a上に波動抑制板16を、有する。図１に、本発明の溶融金属めっき装置１の一例を模式的に示す。（ａ）は縦断面図、（ｂ）は（ａ）のＡ−Ａ矢視図である。なお、鋼帯Ｓの搬送上の観点から、スナウト13内、鋼帯引き上げ領域近傍には、波動抑制板16の配設を行わないほうが好ましい。なお、図１には図示されていないが、本発明の溶融金属めっき装置１にも、溶融金属めっき装置の操業に必要な通常の付帯装置が付設されていることは言うまでもない。   A molten metal plating apparatus 1 according to the present invention includes a pot 12 that contains a plating bath 11 that is a molten metal, and a steel strip S that is continuously immersed in the plating bath. A snout 13 for intruding into the plating bath 11, and a sink roll 14 for changing the direction of the steel strip S that is immersed in the plating bath 11 and intruding into the plating bath, and pulling it up above the plating bath surface 11a, And a wave suppression plate 16 on the plating bath surface 11a. FIG. 1 schematically shows an example of a molten metal plating apparatus 1 of the present invention. (A) is a longitudinal cross-sectional view, (b) is an AA arrow view of (a). From the viewpoint of conveyance of the steel strip S, it is preferable not to dispose the wave suppression plate 16 in the snout 13 and in the vicinity of the steel strip lifting region. Although not shown in FIG. 1, it goes without saying that the molten metal plating apparatus 1 of the present invention is also provided with a normal auxiliary device necessary for operation of the molten metal plating apparatus.

なお、図１では、めっき浴補充用に金属インゴット15を溶融するプリメルトポット12aが付設されているが、本発明はこれに限定されるものではない。プリメルトポット12ａを付設し、しかもポット12との間に浴深さを浅くした溶融金属連絡流路17を配設することにより、金属インゴット15の投入時のめっき浴面11aの変動を多少抑えることができる。本発明においても、めっき浴補充用の金属インゴット15はポット12のめっき浴11中に装入してもよいことはいうまでもない。   In FIG. 1, a pre-melt pot 12a for melting the metal ingot 15 for supplementing the plating bath is provided, but the present invention is not limited to this. By providing a pre-melt pot 12a and a molten metal communication channel 17 with a shallow bath depth between the pot 12 and the pot 12, the fluctuation of the plating bath surface 11a when the metal ingot 15 is charged is somewhat suppressed. be able to. Also in the present invention, it goes without saying that the metal ingot 15 for replenishing the plating bath may be charged into the plating bath 11 of the pot 12.

波動抑制板16は、めっき浴面の少なくとも一部を覆うことができる構造でしかも交換可能に構成され、好ましくは板状、しかも可能なかぎり一体形状とすることが、波動抑制に効果がある。また、波動抑制板16は、めっき浴面に浮上して配設できる。また、波動抑制板16は、さらにドロス等の付着物が付着した際に容易に交換可能なように、簡便な波動抑制板の着脱機構を有することが好ましい。なお、波動抑制板16は、簡易な治具を用いてめっき浴面の移動に伴い昇降可能な程度に固定して配設してもよい。   The wave suppression plate 16 has a structure capable of covering at least a part of the plating bath surface and is configured to be replaceable. Preferably, the wave suppression plate 16 is plate-shaped and integrated as much as possible is effective in suppressing the wave. Further, the wave suppression plate 16 can be disposed so as to float on the plating bath surface. Further, it is preferable that the wave suppressing plate 16 has a simple wave suppressing plate attaching / detaching mechanism so that the wave suppressing plate 16 can be easily exchanged when a deposit such as dross adheres. Note that the wave suppression plate 16 may be fixedly disposed using a simple jig so that it can be moved up and down with the movement of the plating bath surface.

また、本発明における波動抑制板16は、さらに溶融金属の保温機能および／または酸化防止機能を有する材料製とすることが好ましい。溶融金属の保温機能を有することにより、めっき浴面近傍の溶融金属の温度低下を防止でき、めっき浴温度の均一化に寄与しドロスの発生防止に繋がる。また、波動抑制板が酸化防止機能を有することによりめっき浴表面近傍の溶融金属の酸化を防止し酸化物の発生防止に繋がり、品質欠陥発生を抑制できることになる。また、本発明における波動抑制板16を構成する材料は、溶融金属と反応しない材料で、さらにはめっき浴温度でも耐熱性を維持できる材料とすることが好ましい。   In addition, the wave suppression plate 16 in the present invention is preferably made of a material having a molten metal heat retaining function and / or an antioxidant function. By having the function of keeping the molten metal warm, it is possible to prevent the temperature of the molten metal near the plating bath from lowering, contributing to uniform plating bath temperature and preventing dross from occurring. Further, since the wave suppression plate has an antioxidant function, oxidation of the molten metal in the vicinity of the plating bath surface is prevented, and generation of oxides is prevented, and generation of quality defects can be suppressed. In addition, the material constituting the wave suppression plate 16 in the present invention is preferably a material that does not react with the molten metal and that can maintain heat resistance even at a plating bath temperature.

以下、実施例に基づき、さらに詳細に本発明について説明する。   Hereinafter, based on an Example, this invention is demonstrated in detail.

図１に示す、本発明の連続溶融金属めっき装置１を用いて、冷延鋼帯Ｓに溶融亜鉛めっきを施し本発明例とした。また比較として、図３に示す従来の連続溶融金属めっき装置を用いて、同様に冷延鋼帯に溶融亜鉛めっきを施し従来例とした。なお、予め、各連続溶融金属めっき装置について、熱電対を用いて、めっき操業中にめっき浴内の深さ方向の温度を500mm間隔で測定し、浴内0〜2000mm範囲の深さ方向の温度ばらつきを測定した。   Using the continuous molten metal plating apparatus 1 of the present invention shown in FIG. 1, the cold-rolled steel strip S was hot dip galvanized to obtain an example of the present invention. For comparison, a conventional continuous hot metal plating apparatus shown in FIG. 3 was similarly used to apply hot dip galvanization to a cold-rolled steel strip to obtain a conventional example. In addition, for each continuous molten metal plating apparatus, the temperature in the depth direction in the plating bath is measured at intervals of 500 mm during the plating operation using a thermocouple, and the temperature in the depth direction in the range of 0 to 2000 mm in the bath. Variation was measured.

用いた冷延鋼帯は、板厚：0.7〜1.2mm×幅：800〜1200mmの鋼帯各100ｍコイルとし、溶融亜鉛めっき浴への侵入板温は、440〜490℃、溶融亜鉛めっき浴のAl濃度は0.10〜0.20％、通板速度は120〜150m/minとした。
得られた溶融亜鉛めっき鋼帯について、ドロス付着および酸化物付着による品質欠陥の発生個数を調査した。品質欠陥の発生個数は、得られた溶融亜鉛めっき鋼帯各部から500×500mmの大きさの試験片を10個採取し、試験片の表面を目視により観察し、品質欠陥の個数を測定した。 The cold-rolled steel strip used was a steel strip with a thickness of 0.7 to 1.2 mm and a width of 800 to 1200 mm, each with a coil of 100 m. The Al concentration was 0.10 to 0.20%, and the sheet feeding speed was 120 to 150 m / min.
About the obtained hot-dip galvanized steel strip, the number of occurrence of quality defects due to dross adhesion and oxide adhesion was investigated. As for the number of quality defects, 10 test pieces having a size of 500 × 500 mm were collected from each part of the obtained hot dip galvanized steel strip, the surface of the test piece was visually observed, and the number of quality defects was measured.

得られた結果を表１に示す。   The obtained results are shown in Table 1.

Figure 2006265666
Figure 2006265666

本発明の連続溶融金属めっき装置を利用して溶融亜鉛めっき処理を施すことにより、めっき浴浴面の波動が抑制され、さらにはめっき浴の酸化も抑制されて、スナウト内でのドロス、酸化物等の付着による品質欠陥の発生は顕著に低減することがわかる。また本発明の連続溶融金属めっき装置では、めっき浴内の温度が均一化し、とくにめっき浴浴面近傍での温度低下が少なく、ドロスの生成、成長が少なくなるという効果もある。   By applying the hot dip galvanizing treatment using the continuous molten metal plating apparatus of the present invention, the wave motion of the plating bath surface is suppressed, and furthermore, the oxidation of the plating bath is also suppressed, dross and oxide in the snout It can be seen that the occurrence of quality defects due to such adhesion is significantly reduced. Further, the continuous molten metal plating apparatus of the present invention has an effect that the temperature in the plating bath is made uniform, the temperature drop in the vicinity of the plating bath surface is small, and the generation and growth of dross are reduced.

本発明の連続溶融金属めっき装置の一例を模式的に示す、（ａ）縦断面図、（ｂ）Ａ−Ａ矢視図である。BRIEF DESCRIPTION OF THE DRAWINGS It is (a) longitudinal cross-sectional view which shows an example of the continuous molten metal plating apparatus of this invention typically, (b) AA arrow line view. 従来の連続溶融金属めっき装置の一例を模式的に示す縦断面図である。It is a longitudinal cross-sectional view which shows typically an example of the conventional continuous molten metal plating apparatus.

符号の説明Explanation of symbols

１ 連続溶融金属めっき装置
11 めっき浴
12 ポット
13 スナウト
14 シンクロール
15 金属インゴット
16 波動抑制板
17 溶融金属連絡流路
12a プリメルトポット
11a めっき浴浴面 1 Continuous molten metal plating equipment
11 Plating bath
12 pots
13 Snout
14 Syncroll
15 Metal ingot
16 Wave suppression plate
17 Molten metal communication channel
12a Pre-melt pot
11a plating bath surface

Claims (3)

溶融金属であるめっき浴を収納するポットと、該めっき浴中に一部を浸漬して配設され鋼帯を該めっき浴中に連続的に侵入させるためのスナウトと、前記めっき浴中に浸漬配設され該めっき浴に侵入させた前記鋼帯を方向転換させ該めっき浴浴面より上方に引き上げるためのシンクロールと、を有する溶融金属めっき装置であって、前記めっき浴の浴面の少なくとも一部を覆うように波動抑制板を交換可能に配設することを特徴とする連続溶融亜鉛めっき装置。   A pot for storing a plating bath that is a molten metal, a snout that is disposed by immersing a part in the plating bath, and that continuously penetrates the steel strip into the plating bath, and is immersed in the plating bath A sink roll for turning the steel strip that has been disposed and invaded into the plating bath and pulling the steel strip upward from the plating bath surface, wherein the molten metal plating apparatus has at least one of the bath surfaces of the plating bath. A continuous hot-dip galvanizing apparatus characterized in that a wave suppression plate is disposed so as to be partially exchangeable. 前記波動抑制板が、溶融金属の酸化防止機能を有することを特徴とする請求項１に記載の連続溶融亜鉛めっき装置。   The continuous hot dip galvanizing apparatus according to claim 1, wherein the wave suppression plate has a function of preventing oxidation of molten metal. 前記波動抑制板が、溶融金属の保温機能を有することを特徴とする請求項１または２に記載の連続溶融亜鉛めっき装置。   The continuous hot-dip galvanizing apparatus according to claim 1 or 2, wherein the wave suppression plate has a function of keeping molten metal warm.
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JP2008121065A (en) * 2006-11-13 2008-05-29 Jfe Steel Kk Hot-dip metal-plating apparatus
JP2008266723A (en) * 2007-04-20 2008-11-06 Jfe Steel Kk Hot dip metal plating method for steel sheet using continuous hot dip metal plating device
JP2009041053A (en) * 2007-08-07 2009-02-26 Jfe Steel Kk Plating pot and plating equipment
JP2012092362A (en) * 2010-10-25 2012-05-17 Jfe Steel Corp Apparatus and method for producing hot dip metal coated steel strip
JP2021120482A (en) * 2020-01-31 2021-08-19 Ｊｆｅスチール株式会社 Device and method for producing continuous hot-dip plated steel strip

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JPH04341551A (en) * 1991-05-20 1992-11-27 Kawasaki Steel Corp Method for preventing sticking of floating matter on bath surface in continuous hot-dip metal plating line
JPH05125512A (en) * 1991-10-30 1993-05-21 Nkk Corp Pot structure for hot dip metal coating
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JPH03211263A (en) * 1990-01-16 1991-09-17 Kawasaki Steel Corp Equipment for producing hot dip galvanized steel sheet
JPH04341551A (en) * 1991-05-20 1992-11-27 Kawasaki Steel Corp Method for preventing sticking of floating matter on bath surface in continuous hot-dip metal plating line
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008121065A (en) * 2006-11-13 2008-05-29 Jfe Steel Kk Hot-dip metal-plating apparatus
JP2008266723A (en) * 2007-04-20 2008-11-06 Jfe Steel Kk Hot dip metal plating method for steel sheet using continuous hot dip metal plating device
JP2009041053A (en) * 2007-08-07 2009-02-26 Jfe Steel Kk Plating pot and plating equipment
JP2012092362A (en) * 2010-10-25 2012-05-17 Jfe Steel Corp Apparatus and method for producing hot dip metal coated steel strip
JP2021120482A (en) * 2020-01-31 2021-08-19 Ｊｆｅスチール株式会社 Device and method for producing continuous hot-dip plated steel strip
JP7147793B2 (en) 2020-01-31 2022-10-05 Ｊｆｅスチール株式会社 Manufacturing equipment and manufacturing method for continuous hot-dip metal plated steel strip

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