JPH03211262A - Method and apparatus for producing hot dip galvanized steel sheet - Google Patents
Method and apparatus for producing hot dip galvanized steel sheetInfo
- Publication number
- JPH03211262A JPH03211262A JP436790A JP436790A JPH03211262A JP H03211262 A JPH03211262 A JP H03211262A JP 436790 A JP436790 A JP 436790A JP 436790 A JP436790 A JP 436790A JP H03211262 A JPH03211262 A JP H03211262A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- dross
- hot
- bath
- alloy
- 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.)
- Pending
Links
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims description 10
- 239000008397 galvanized steel Substances 0.000 title claims description 10
- 238000000034 method Methods 0.000 title claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 45
- 239000010959 steel Substances 0.000 claims abstract description 45
- 238000007747 plating Methods 0.000 claims abstract description 24
- 238000005275 alloying Methods 0.000 claims abstract description 22
- 238000005246 galvanizing Methods 0.000 claims abstract description 22
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 13
- 230000007797 corrosion Effects 0.000 claims abstract description 9
- 238000005260 corrosion Methods 0.000 claims abstract description 9
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 4
- 229910001297 Zn alloy Inorganic materials 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000011701 zinc Substances 0.000 abstract description 19
- 230000007547 defect Effects 0.000 abstract description 15
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract description 7
- 229910045601 alloy Inorganic materials 0.000 abstract description 7
- 239000000956 alloy Substances 0.000 abstract description 7
- 229910007570 Zn-Al Inorganic materials 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 238000007667 floating Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 235000002639 sodium chloride Nutrition 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 210000004894 snout Anatomy 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910001020 Au alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000003353 gold alloy Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 210000000554 iris Anatomy 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Coating With Molten Metal (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、溶融亜鉛めっき鋼板の製造方法および装置に
関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method and apparatus for manufacturing hot-dip galvanized steel sheets.
（従来の技術）
すでによく知られているように、現在、北米やカナダで
は、冬期の自動車スリップ事故防止のため、岩塩散布に
よる道路の凍結防止がなされている。(Prior Art) As is already well known, in North America and Canada, roads are currently prevented from freezing by spraying rock salt to prevent motor vehicle slip accidents in winter.
ところが、かかる岩塩散布により自動車車体は苛酷な腐
食環境にさらされることになり、そのため高耐食性の表
面処理鋼板が使用されつつある。However, as a result of such rock salt spraying, automobile bodies are exposed to a severe corrosive environment, and therefore surface-treated steel sheets with high corrosion resistance are being used.
したがって、外装用の鋼板についても溶接性・加工性が
冷延鋼板並みの特性をもち、耐食性にも優れた合金化処
理鋼板が注目されている。しかも、外装用のため鮮映性
が要求されるなど、ますます仕様の厳しい材料が求めら
れるようになっている。Therefore, alloyed steel sheets that have weldability and workability comparable to those of cold-rolled steel sheets and excellent corrosion resistance are attracting attention as steel sheets for exterior use. Moreover, materials with increasingly strict specifications are being required, such as the need for high image clarity for exterior use.
ところで、溶融金属めっきライン、例えば溶融亜鉛めっ
きラインでは、めっきのままの状態の通常の溶融亜鉛め
っき鋼板と、めっき後合金化処理する合金化処理鋼板（
ガルバニール鋼板）とが製造されるが、一般にこの２種
類の鋼板は同一のラインにおいて製造条件を適宜切り換
えることにより連続的に製造される。By the way, in a hot-dip metal plating line, for example, a hot-dip galvanizing line, a normal hot-dip galvanized steel sheet in an as-plated state and an alloyed steel sheet (
Generally, these two types of steel sheets are manufactured continuously on the same line by appropriately changing the manufacturing conditions.
しかし、鋼板（ストリップともいう）の連続溶融亜鉛め
っきを行っている溶融亜鉛めっき槽内では、ストリップ
のＦｅが溶出してＦｅＺｎ７を主成分とするドロスが生
成し、このドロスはめっき槽の底部に堆積する。However, in a hot-dip galvanizing tank where steel sheets (also called strips) are continuously hot-dip galvanized, the Fe in the strip is eluted and dross containing FeZn7 as the main component is generated, and this dross is deposited at the bottom of the galvanizing tank. accumulate.
第６図は、このような溶融亜鉛めっきに際してのボトム
ドロスの生成および巻上げの様子の説明図であり、スナ
ウト２を経てめっき槽７に連続的に送られてきたストリ
ップ１はジンクロール３を周回しながらめっきされ、め
っき終了後は案内ロール４を経てめっき槽から連続的に
取り出される。FIG. 6 is an explanatory diagram of the generation and winding up of bottom dross during such hot-dip galvanizing. The strip 1, which is continuously sent to the plating tank 7 via the snout 2, goes around the zinc roll 3. After the plating is completed, it is continuously taken out from the plating tank via a guide roll 4.
めっき浴内に浮遊するドロスは次第にめっき槽底部に溜
まり、ボトムドロス５を形成する。浮遊ドロスの一部は
浴内のへＱと化合して塔頂部にトンブトロス６として浮
遊する。Dross floating in the plating bath gradually accumulates at the bottom of the plating tank, forming bottom dross 5. A part of the floating dross combines with HeQ in the bath and floats at the top of the tower as Tonbutros 6.
このように堆積したボトムドロスはジンクロール下部付
近で生じるストリップの随伴流によって洛中に巻上げら
れてストリップの上側表面に付着する。The bottom dross thus deposited is rolled up by the accompanying flow of the strip generated near the bottom of the zinc roll and attached to the upper surface of the strip.
前述のように、めっき鋼板に対する仕様が厳しくなった
現在、そのようなボトムドロスのストリップへの付着が
行われると、プレス時にプレスプッと称する表面不均一
部分が生じ、鮮映性が害されるばかりでなく、ドロスブ
ッと称する不均一部分が形成される結果、局部電池を形
成し、耐食性を低下させる基となる表面欠陥が生じ、め
っき鋼板に品質欠陥を生じさせる。As mentioned above, now that specifications for galvanized steel sheets have become stricter, if such bottom dross adheres to the strip, uneven surface areas called press splats will occur during pressing, which not only impairs image clarity but also As a result of the formation of non-uniform areas called dross, surface defects are generated which form local batteries and become the basis for reducing corrosion resistance, causing quality defects in the plated steel sheet.
従来、ストリップへのドロス付着を防止すべく、ボトム
ドロスの生成を抑制する一般的な方法として、めっき浴
内のＡｆ２分を富化し、下記反応によりＦｅＪＱｓをト
ップドロスとして浮上回収する方法がある。Conventionally, as a general method for suppressing the formation of bottom dross in order to prevent dross from adhering to the strip, there is a method of enriching Af2 in the plating bath and floating and collecting FeJQs as top dross through the following reaction.
２ ＦｅＺｎ７ ＋ ５ Ａｌ −４ＦｅＪＱｓ
＋ １４Ｚｎしかし、Ａｌはめっき皮膜の合金化を抑制
する作用があることから、製造の対象が合金化処理銅板
の場合には可及的少ない量に制限しているのであり、ト
ップドロス浮上促進のためＭを添加すると、一部がめつ
き浴に残り、合金化不良を起こし品質低下の問題を生じ
させる。2 FeZn7 + 5 Al -4FeJQs
+ 14Zn However, since Al has the effect of suppressing alloying of the plating film, when the target of manufacture is alloyed copper plate, the amount is limited to the lowest possible amount, and the amount of Al is limited to the lowest possible amount to promote top dross floating. Therefore, when M is added, a portion remains in the plating bath, causing poor alloying and resulting in quality deterioration.
特に、すでに述べたように、合金化処理鋼板においても
優れた鮮映性などの表面性状が求められている現状から
は、Ｍ添加によらないドロス欠陥防止方法が強く求めら
れている。In particular, as already mentioned, in view of the current situation where alloyed steel sheets are required to have surface properties such as excellent image clarity, there is a strong demand for a method for preventing dross defects that does not rely on M addition.
（発明が解決しようとする課題）
本発明の目的は、めっき外観と耐食性にすぐれた溶融亜
鉛めっき鋼板を製造する方法および装置を提供すること
である。(Problems to be Solved by the Invention) An object of the present invention is to provide a method and apparatus for manufacturing a hot-dip galvanized steel sheet with excellent plating appearance and corrosion resistance.
（課題を解決するための手段）
本発明者らは、かかる目的達成のため、熔融亜鉛めっき
の合金化反応およびドロス生成反応を鋭意調査した結果
、以下の知見を得、本発明に至った。(Means for Solving the Problems) In order to achieve the above object, the present inventors conducted extensive research on the alloying reaction and dross generation reaction of molten galvanizing, and as a result, they obtained the following knowledge and arrived at the present invention.
（１））７ブドロス（ＦｅｚＡｌｓ）、ボトムドロス（
ＦｅＺｎ、）はともに鋼板がＺｎと反応した際に生成し
た微小核がＺｎ浴中で充分時間をかけ、成長したもので
ある。成長したものは５０〜４００―−もの大きさを有
するが、当初の微小核は３０ｓ以下が大半を占める。(1)) 7 budros (FezAls), bottom dross (
Both FeZn and ) are micronuclei generated when a steel plate reacts with Zn, which grow over a sufficient period of time in a Zn bath. The grown ones have a size of 50 to 400, but most of the initial micronuclei are 30 seconds or less.
（２）トップドロス、ボトムドロスの付着した鋼板を連
続溶融めっきラインに相当する合金化条件で合金化処理
を行ったところ直径５０−以下のドロスは合金化処理時
間中のＦｅ、 Ｚｎ、 Ａｌの拡散により消滅し、合金
化処理後ドロス欠陥としては残存しない。(2) When a steel plate with top and bottom dross was alloyed under alloying conditions equivalent to a continuous hot-dip plating line, the dross with a diameter of 50 mm or less was due to diffusion of Fe, Zn, and Al during the alloying process. The dross defects disappear after the alloying process and do not remain as dross defects.
（３）同様の傾向は溶融めっき後調質圧延を行う場合に
もみられた。(3) A similar tendency was observed when temper rolling was performed after hot dipping.
ここに、本発明の要旨とするところは、溶融亜鉛めっき
槽内のめっき浴への鋼板の侵入および引き出しを連続的
に行う溶融亜鉛めっきに際し、溶融亜鉛めっき槽内に浸
漬され連続走行する鋼板に、該鋼板とＺｎ、 Ａｌとが
反応してできた微小なＦｅ −Ｚｎ合および／またはＦ
ｅ−Ａｌ金合金付着させたま＼引き出し、次いで合金化
処理を行い無害化することを特徴とするめっき外観およ
び耐食性にすぐれた溶融亜鉛めっき鋼板の製造方法であ
る。Here, the gist of the present invention is that during hot-dip galvanizing, in which the steel plate is continuously inserted into and pulled out from the plating bath in the hot-dip galvanizing tank, , minute Fe-Zn combinations and/or F formed by the reaction of the steel plate with Zn and Al.
This is a method for producing a hot-dip galvanized steel sheet with excellent plating appearance and corrosion resistance, which is characterized by pulling out the e-Al gold alloy while it is adhered thereto, and then performing alloying treatment to render it harmless.
上記合金化処理に代えて調質圧延を行ってもよまた、別
の面からは、溶融亜鉛めっき槽内のめっき浴への鋼板の
侵入および引き出しを連続的に行う溶融亜鉛めっき装置
において、溶融亜鉛めっき槽内に浸漬され連続走行する
鋼板の廻りに近接して配置された筒型のカバーを備えた
ことを特徴とするめっき外観および耐食性にすぐれた溶
融亜鉛めっき鋼板の製造装置である。Temper rolling may be performed in place of the alloying treatment described above.Also, from another point of view, hot-dip galvanizing equipment that continuously inserts and pulls steel sheets into and out of a plating bath in a hot-dip galvanizing tank, This is an apparatus for producing hot-dip galvanized steel sheets with excellent coating appearance and corrosion resistance, characterized by having a cylindrical cover disposed close to the steel sheets that are immersed in a galvanizing tank and continuously running.
ここに、上記合金化処理条件および調質圧延条件はめっ
き期間中に付着する微小核の大きさ、量によって変わる
が、一般には前者では５００〜６００°Ｃでの加熱およ
び後者では０．２〜２．０％の圧下で十分である。Here, the alloying treatment conditions and temper rolling conditions described above vary depending on the size and amount of micronuclei deposited during the plating period, but in general, the former is heated at 500 to 600°C, and the latter is heated at 0.2 to 600°C. A pressure of 2.0% is sufficient.
（作用） 次に、添付図面により本発明の詳細な説明する。(effect) Next, the present invention will be explained in detail with reference to the accompanying drawings.
第１図において鋼板ｌが熔融亜鉛めっき槽７に浸漬され
た時に、鋼板と亜鉛浴中のＡｌおよびＺｎと反応しＦｅ
−Ｚｎ合金および／またはＦｅ−Ａｌ合金（これは便
宜上Ｆｅ−Ｚｎ−へＱ合金と表わすこともある）が生成
する。ここでは代表的にＦｅｚＡｌｓ 、ＦｅＺｎ７と
するが各反応の段階でＦｅ、 Ｍ、 Ｚｎの比率が違っ
た合金が生成する。この合金は生成、成長、再溶解、そ
して分裂して、Ｆｅ−ＺｎＡｌ合金の微小核（代表的に
はＦｅｘＡｌｓ 、 ＦｅＺｎ？の微小核）をＺｎめっ
き浴中に放出する。この微小核はＺｎ浴中に滞留するう
ちに他の微小核と集合または独自に成長し各種サイズの
ＦｅｘＡｌｓ 、 ＦｅＺｎｙ となり、ＦｅｚＡｌｓ
は比重が軽いためトップドロス６になり、ＦｅＺｎ７は
比重が重いためボトムドロス５となる。In FIG. 1, when a steel plate l is immersed in a hot-dip galvanizing bath 7, the steel plate reacts with Al and Zn in the zinc bath, and Fe
-Zn alloy and/or Fe-Al alloy (which may also be expressed as Fe-Zn-Q alloy for convenience) is formed. Here, FezAls and FeZn7 are representatively used, but alloys with different ratios of Fe, M, and Zn are produced at each reaction stage. This alloy forms, grows, remelts, and splits to release micronuclei of Fe-ZnAl alloy (typically FexAls, FeZn? micronuclei) into the Zn plating bath. While remaining in the Zn bath, these micronuclei aggregate with other micronuclei or grow independently to form FexAls and FeZny of various sizes, and FezAls.
Since FeZn7 has a light specific gravity, it has a top dross of 6, and FeZn7 has a high specific gravity, so it has a bottom dross of 5.
ここに、本発明によれば、鋼板１のまわりに近接してカ
バー８を設置し、綱板１から生成したＦｅＺｎ−Ａｌ合
金の微小核９が、鋼板１の随伴流により即時巻上げられ
鋼板１に付着するようにする。Here, according to the present invention, the cover 8 is installed close to the steel plate 1, and the FeZn-Al alloy micronuclei 9 generated from the steel plate 1 are immediately rolled up by the accompanying flow of the steel plate 1, and the cover 8 is installed close to the steel plate 1. Make sure it sticks to the surface.
鋼板１上の微小核９はその後、合金化炉１０にて加熱さ
れ、亜鉛被膜中に消失し、ドロス欠陥とはならないので
ある。The micronuclei 9 on the steel plate 1 are then heated in the alloying furnace 10, disappear into the zinc coating, and do not become dross defects.
カバー８とストリップ表面との距離は短かければ短かい
程よいが、余り小さいと接触のおそれがあるため、一般
には１０〜３０（１＋＋ｓあれば十分である。The shorter the distance between the cover 8 and the strip surface, the better; however, if it is too small, there is a risk of contact, so generally 10 to 30 (1++s) is sufficient.
このときの加熱処理条件は特に制限はないが、前述のよ
うに一般にはドロス欠陥を解消できれば、例えば５５０
℃程度であれば十分である。なお、かかる合金化条件は
従来法にあっても採用されていることは考えられるが、
その場合には十分成長したドロス付着がみられるためド
ロス欠陥の解消は考えられない。There are no particular restrictions on the heat treatment conditions at this time, but as mentioned above, in general, if dross defects can be eliminated, for example, 550
A temperature around ℃ is sufficient. It is conceivable that such alloying conditions are also used in conventional methods; however,
In that case, since sufficiently grown dross deposits are observed, it is impossible to eliminate the dross defects.
第２図（→および（ｂ）は、本発明の断面図の一例を示
したものであるが、カバー８は第２図（ａ）のように側
壁がなくても又第２図さ）のように側壁の一部に穴１１
゛があってもよく、それぞれ穴１１’ 、１１“を介し
てカバー外部と浴を交換するようになっており、鋼板１
が消費するＡｌを外部より補充するような構造をしてい
る。FIG. 2 (→ and (b) show an example of a cross-sectional view of the present invention, but the cover 8 can be used even without the side wall as shown in FIG. 2 (a)). Hole 11 in part of the side wall like this
The bath may be exchanged with the outside of the cover through the holes 11' and 11'', respectively, and the steel plate 1
The structure is such that the Al consumed by the fuel is replenished from the outside.
本発明は合金化処理鋼板にて大きな効果を発揮するが、
合金化を行わない鋼板においても調質圧延ミルと組合せ
、めっき後０．２％以上の圧下を行うことにより、ドロ
ス欠陥が微小であるため、ドロス欠陥が外観上消失し有
効である。この場合にも前述の合金化処理の場合と同様
に、０．３％程度の調質圧延は従来も行われていたが、
そのときには十分に成長したドロスが付着していて、本
発明におけるようなドロス欠陥の解消は考えられない。Although the present invention exhibits great effects on alloyed steel sheets,
Even in the case of a steel sheet that is not alloyed, by combining it with a temper rolling mill and performing a rolling reduction of 0.2% or more after plating, the dross defects are so small that they disappear visually and are effective. In this case as well, as in the case of the alloying treatment described above, temper rolling of about 0.3% was conventionally performed.
At that time, sufficiently grown dross is attached, and it is impossible to eliminate dross defects as in the present invention.
次に、本発明の作用効果について具体的に実施例でもっ
て説明する。Next, the effects of the present invention will be specifically explained using examples.
実施例１
本例では、第３図に示す構成および寸法を備えたカバー
を使用して、図示のようにＺｎめっき温浸入部と出口部
に開孔部１２．１３をそれぞれ設けたカバーを綱板１お
よびジンクロール３の廻すに配置し、実際の製造ライン
にて０．８ ｍｍ ｔ Ｘ １２００ｖ＋ｎの鋼板（低
炭素材）を通常の溶融亜鉛めっき条件でめっきし、次い
で合金化処理を実施し、そのとき鋼板上に残ったドロス
個数を比較した。その結果、第４図にグラフで示すよう
に、本発明によれば実質的にドロス残留は見られないな
ど極めて良好な結果が得られることが分かる。Example 1 In this example, a cover with the configuration and dimensions shown in FIG. 3 is used, and a cover with openings 12 and 13 provided at the Zn plating hot infiltration part and the outlet part, respectively, as shown in the figure, is attached to a wire. A steel plate (low carbon material) of 0.8 mm t At that time, the number of dross remaining on the steel plate was compared. As a result, as shown in the graph of FIG. 4, it can be seen that according to the present invention, very good results such as virtually no dross remaining can be obtained.
めっき条件：通板速度
浴温度
侵人材温度
浴中有効Ａｌ
： ９０ ＊ｐ菖
： ４６０°Ｃ
＝ ４７０°Ｃ
： ０．９０ ｗｔ％
合金化条件：温 度 ： ５５０ ’Ｃ時間 ： ２
０ ｓｅｃ
雰囲気 二大気
実施例２
各種サイズのドロスを付着させた目付量３０／３０ｇ／
ボの試片（２５０１×３０賀Ｘ０．８ｔ）を５５０″Ｃ
にて１０ｓｅｃ塩浴にて合金化処理を行い合金化処理前
後のドロスの大きさを比較した。結果は第５図にグラフ
で示すが、これからも分かるように、１００−以下のド
ロス（被膜中のドロス５〇−相当）が合金化処理にて実
質上消滅する。Plating conditions: Threading speed Bath temperature Effective Al in bath temperature: 90 *P irises: 460°C = 470°C: 0.90 wt% Alloying conditions: Temperature: 550'C Time: 2
0 sec Atmosphere Two-atmosphere Example 2 Weight per area with various sizes of dross attached: 30/30g/
550″C
Alloying treatment was performed in a salt bath for 10 seconds, and the size of dross before and after the alloying treatment was compared. The results are shown graphically in FIG. 5, and as can be seen from the graph, dross of 100 or less (corresponding to 50 of dross in the coating) is substantially eliminated by the alloying treatment.
実施例３
実施例１にて製造しためっき鋼板を合金化を行わないで
製造し、次いで圧下率０．３５％の調質圧延を行い、得
られためっき鋼板についてドロス欠陥の発生状況を調査
したところ、ドロス欠陥は全くみとめられなかった。Example 3 The plated steel sheet manufactured in Example 1 was manufactured without alloying, and then temper rolling was performed at a rolling reduction of 0.35%, and the occurrence of dross defects was investigated on the obtained plated steel sheet. However, no dross defects were observed at all.
（発明の効果）
以上説明したように、本発明によれば、従来とかく問題
の多かったドロス欠陥が、カバーを設けるという特異な
構成によって解消し、表面外観のすぐれた溶融亜鉛めっ
き鋼板の製造が可能となるのであって、その着想のユニ
ークさはもちろん、実用上の意義は大きい。(Effects of the Invention) As explained above, according to the present invention, dross defects, which have been a problem in the past, are eliminated by the unique structure of providing a cover, and it is possible to manufacture hot-dip galvanized steel sheets with excellent surface appearance. Not only is the idea unique, but it also has great practical significance.
第１図は、本発明にかかる溶融亜鉛めっき装置の概略説
明図；
第２図（ａ）および同（ロ）は、本発明において使用す
るカバーの部分拡大図；
第３図は、実施例において使用する溶融亜鉛めっき装置
のカバーの部分を示す略式斜視図：第４図および第５図
は、実施例の結果をまとめて示すグラフ；および
第６図は、従来方法による溶融亜鉛めっき方法の説明図
である。
１：鋼板 ２：スナウト
３： ジンクロール ４：案内ロール５：ボトムドロ
ス ６： トップドロス７：めっき槽 ８：カ
バー
９ ： Ｆｅ−Ｚｎ−Ａｌ２の微小核
ｌＯ：
合金化炉
１１’、Ｉｌ’：
八
１２゜
１３：
開孔部FIG. 1 is a schematic explanatory diagram of a hot-dip galvanizing apparatus according to the present invention; FIGS. 2(a) and 2(b) are partially enlarged views of a cover used in the present invention; FIG. A schematic perspective view showing the cover part of the hot-dip galvanizing equipment used; FIGS. 4 and 5 are graphs summarizing the results of the examples; and FIG. 6 is an explanation of the conventional hot-dip galvanizing method. It is a diagram. 1: Steel plate 2: Snout 3: Zinc roll 4: Guide roll 5: Bottom dross 6: Top dross 7: Plating tank 8: Cover 9: Fe-Zn-Al2 micronuclei 1O: Alloying furnace 11', Il': 8 12゜13: Opening part
Claims (3)
よび引き出しを連続的に行う溶融亜鉛めっきに際し、溶
融亜鉛めっき槽内に浸漬され連続走行する鋼板に、該鋼
板とＺｎ、Ａｌとが反応してできた微小なＦｅ−Ｚｎ合
金および／またはＦｅ−Ａｌ合金を付着させたまゝ引き
出し、次いで合金化処理を行い無害化することを特徴と
するめっき外観および耐食性にすぐれた溶融亜鉛めっき
鋼板の製造方法。(1) During hot-dip galvanizing, in which the steel plate is continuously inserted into and pulled out of the plating bath in the hot-dip galvanizing tank, the steel plate, Zn, and Al are immersed in the hot-dip galvanizing tank and continuously moved. A hot-dip galvanized steel sheet with excellent coating appearance and corrosion resistance, characterized in that it is pulled out with fine Fe-Zn alloy and/or Fe-Al alloy formed by reaction attached, and then subjected to alloying treatment to render it harmless. manufacturing method.
記載の方法。(2) Claim 1 in which temper rolling is performed in place of the alloying treatment.
Method described.
よび引き出しを連続的に行う溶融亜鉛めっき装置におい
て、溶融亜鉛めっき槽内に浸漬され連続走行する鋼板の
廻りに近接して配置された筒型のカバーを備えたことを
特徴とするめっき外観および耐食性にすぐれた溶融亜鉛
めっき鋼板の製造装置。(3) In hot-dip galvanizing equipment that continuously moves steel plates into and out of the galvanizing bath, the galvanizing device is placed close to the steel plate that is immersed in the hot-dip galvanizing bath and is continuously moving. A manufacturing device for hot-dip galvanized steel sheet with excellent plating appearance and corrosion resistance, characterized by being equipped with a cylindrical cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP436790A JPH03211262A (en) | 1990-01-11 | 1990-01-11 | Method and apparatus for producing hot dip galvanized steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP436790A JPH03211262A (en) | 1990-01-11 | 1990-01-11 | Method and apparatus for producing hot dip galvanized steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03211262A true JPH03211262A (en) | 1991-09-17 |
Family
ID=11582405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP436790A Pending JPH03211262A (en) | 1990-01-11 | 1990-01-11 | Method and apparatus for producing hot dip galvanized steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03211262A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999058735A3 (en) * | 1998-01-29 | 2000-03-09 | Perti J Sippola | Method of producing hot-dip zinc coated steel sheet free of dross pick-up defects on coating and associated apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62185864A (en) * | 1986-02-10 | 1987-08-14 | Nippon Steel Corp | Hot dipping method |
-
1990
- 1990-01-11 JP JP436790A patent/JPH03211262A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62185864A (en) * | 1986-02-10 | 1987-08-14 | Nippon Steel Corp | Hot dipping method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999058735A3 (en) * | 1998-01-29 | 2000-03-09 | Perti J Sippola | Method of producing hot-dip zinc coated steel sheet free of dross pick-up defects on coating and associated apparatus |
| AU737798B2 (en) * | 1998-01-29 | 2001-08-30 | Perti J. Sippola | Method of producing hot-dip zinc coated steel sheet free of dross pick-up defects on coating and associated apparatus |
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