JPH0247247A - Method of preventing edge overcoat of hot dip coating - Google Patents
Method of preventing edge overcoat of hot dip coatingInfo
- Publication number
- JPH0247247A JPH0247247A JP19951588A JP19951588A JPH0247247A JP H0247247 A JPH0247247 A JP H0247247A JP 19951588 A JP19951588 A JP 19951588A JP 19951588 A JP19951588 A JP 19951588A JP H0247247 A JPH0247247 A JP H0247247A
- Authority
- JP
- Japan
- Prior art keywords
- strip
- metal
- plating
- edge
- hot dip
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000003618 dip coating Methods 0.000 title abstract 2
- 229910052751 metal Inorganic materials 0.000 claims abstract description 26
- 239000002184 metal Substances 0.000 claims abstract description 26
- 238000007747 plating Methods 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 238000003825 pressing Methods 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 230000002542 deteriorative effect Effects 0.000 abstract 1
- 238000007711 solidification Methods 0.000 abstract 1
- 230000008023 solidification Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 15
- 238000005246 galvanizing Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 229910001335 Galvanized steel Inorganic materials 0.000 description 5
- 239000008397 galvanized steel Substances 0.000 description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000007716 flux method Methods 0.000 description 1
- 238000005244 galvannealing Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Coating Apparatus (AREA)
- 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、連続溶融亜鉛めっき、あるいは連続溶融アル
ミめっき等の溶融金属めっき方法において、鋼板のエツ
ジ部のめっき厚さが鋼板中央部より厚くなる、いわゆる
、エツジオーバーコートを防止する方法に関するもので
ある。Detailed Description of the Invention (Industrial Field of Application) The present invention is directed to a hot-dip metal plating method such as continuous hot-dip galvanizing or continuous hot-dip aluminum plating, in which the plating thickness at the edges of a steel plate is thicker than at the center of the steel plate. This invention relates to a method for preventing so-called edge overcoat.
（従来の技術）
連続溶融亜鉛めっきは、一般に、フラックス法あるいは
水素還元法等で表面活性化処理を行った鋼板を溶融亜鉛
洛中に浸漬した後、ガスワイピングノズルにより鋼板表
裏面に過剰に付着した溶融亜鉛を絞り取ることによって
鋼板表裏面に鉄との合金層を介して所定厚さの亜鉛皮膜
を形成するものである。(Prior art) Continuous hot-dip galvanizing generally involves immersing a steel plate that has been surface-activated using a flux method or hydrogen reduction method in hot-dip galvanizing, and then using a gas wiping nozzle to remove excessive adhesion to the front and back surfaces of the steel plate. By squeezing out molten zinc, a zinc film of a predetermined thickness is formed on the front and back surfaces of a steel sheet through an alloy layer with iron.
ところで、近年防錆鋼板としての溶融亜鉛めっき鋼板の
需要が増加し、連続溶融亜鉛めっき設備では生産性向上
およびコスト低減を目的として高速化、自動化および薄
目付化が要求されるとともに亜鉛めっき厚さの均一化、
美麗化が要求されている。一般に、ガスワイピングにお
いては、ストリップエツジ部の目付厚さがストリップ中
央部に比べて厚くなるエツジオーバーコートが発生する
。By the way, the demand for hot-dip galvanized steel sheets as rust-proof steel sheets has increased in recent years, and continuous hot-dip galvanizing equipment is required to be faster, more automated, and thinner in order to improve productivity and reduce costs. equalization,
Beautification is required. Generally, in gas wiping, an edge overcoat occurs in which the fabric weight at the edge of the strip is thicker than at the center of the strip.
このエツジオーバーコートは、特にめっき直後に加熱合
金化処理が行われるガルバニール（合金化処理溶融亜鉛
めっき）において、めっき厚さが厚いエツジ部の合金化
が遅れるエツジ未処理の原因となる。また、通常の溶融
めっき製品の場合でも、エツジオーバーコートはコイル
巻取り時における荷崩れの原因になる。This edge overcoat is a cause of untreated edges, where alloying is delayed at edge portions where the plating is thick, especially in galvannealing (hot-dip galvanizing) where heat alloying treatment is performed immediately after plating. Furthermore, even in the case of ordinary hot-dip plated products, edge overcoat causes the load to collapse during coil winding.
このようなエッジオーバーコー［・の問題に対しては、
従来次のような種々の防止対策がとられてきた。For this kind of edge overcoat problem,
Conventionally, various preventive measures have been taken as follows.
第１の例は、第４図に示すようにワイピングノズル１の
スリットギャップ２において、ストリップ３の幅より若
干狭い位置よりノズルの両側に向かって勾配を付けてス
リットギャップ２を両側にいくほど大きくし、ストリッ
プエツジ部に衝突するワイピングジェットの動圧を増加
させることによりエツジ部の溶融亜鉛絞り力を大きくす
る方法である。In the first example, as shown in Fig. 4, the slit gap 2 of the wiping nozzle 1 is sloped toward both sides of the nozzle from a position slightly narrower than the width of the strip 3, and the slit gap 2 becomes larger as it goes to both sides. However, this method increases the squeezing force of molten zinc at the edge by increasing the dynamic pressure of the wiping jet that impinges on the edge of the strip.
第２の例は、特公昭５５−４１２９５号あるいは、特開
昭５７−１５８３６３号に代表される補助ノズル方式で
ある。すなわち、第５図に示すごとくワイピングノズル
１の上部にあってストリップ３のエツジ部にあたる両側
にノズル幅方向に移動可能な補助ノズル４を設けること
によりストリップエツジ部の絞り力を強化する方法であ
る。The second example is an auxiliary nozzle system as typified by Japanese Patent Publication No. 55-41295 or Japanese Patent Application Laid-Open No. 57-158363. That is, as shown in FIG. 5, the squeezing force at the edge of the strip is strengthened by providing auxiliary nozzles 4 movable in the nozzle width direction on both sides of the edge of the strip 3 at the top of the wiping nozzle 1. .
第３の例は、エツジプレート方式である。本方式は、第
６図に示すごとくストリップエツジ部において、ワイピ
ングジェットが衝突する部分にダミーのエツジプレート
５を設けることによりエツジオーバーコートを防止する
方法である。The third example is the edge plate method. This method is a method for preventing edge overcoat by providing a dummy edge plate 5 at the strip edge portion where the wiping jet collides, as shown in FIG.
（発明が解決しようとする課題）
しかしながら前述の従来例では以下に示す問題点がある
。(Problems to be Solved by the Invention) However, the above-mentioned conventional example has the following problems.
まず、第１の例では、ストリップの幅が変わると、スト
リップエツジ部にあたるワイピングノズルのスリットギ
ャップの位置が異なるためエツジオーバーコートの度合
が異なる。従って、エツジオーバーコートを十分に防止
するには、ワイピングノズルを交換する必要があり、生
産性が低下する欠点がある。また、エツジ部のスリット
ギャップが広くガス噴出量も多いため、スプラッシュや
騒音の発生が著しい。特に、スプラッシュの多発はワイ
ピングノズルやストリップを汚染し、ノズル清（署によ
る生産性低下および品質低下を招くという問題点がある
。First, in the first example, when the width of the strip changes, the position of the slit gap of the wiping nozzle corresponding to the edge of the strip changes, so the degree of edge overcoating changes. Therefore, in order to sufficiently prevent edge overcoat, it is necessary to replace the wiping nozzle, which has the drawback of reducing productivity. Furthermore, since the slit gap at the edge portion is wide and the amount of gas ejected is large, splash and noise are significantly generated. In particular, there is a problem in that frequent splashes contaminate the wiping nozzle and strip, resulting in decreased productivity and quality due to nozzle cleaning.
第２の例においては、ストリップの幅が変わるごとに補
助ノズルのみを移動すればよいため、第１の例のような
ノズル交換による生産性低下の問題は回避できるものの
、スプラッシュや騒音の発生に対しては上記第１の例と
同様にワイピングノズルの頻煩な清掃は免れない。In the second example, only the auxiliary nozzle needs to be moved each time the strip width changes, so the problem of decreased productivity due to nozzle replacement as in the first example can be avoided, but it also causes splash and noise. On the other hand, as in the first example, frequent cleaning of the wiping nozzle is inevitable.
第３の例では、エツジプレートとストリップとの隙間が
あまり広くなるとエツジオーバーコート防止効果が低減
するため、通仮によるストリップの振動にあわせてエツ
ジプレートを一定の間隔に保ちながら追従させなければ
ならない。この追従機構は、高速通板では、高応答性が
要求され設備費の高騰を招く欠点がある。In the third example, if the gap between the edge plate and the strip becomes too large, the edge overcoat prevention effect will be reduced, so it is necessary to keep the edge plate at a constant interval and follow the vibration of the strip due to passing. . This follow-up mechanism has the disadvantage that high responsiveness is required for high-speed sheet threading, leading to a rise in equipment costs.
本発明は、上述した従来技術の問題点を解消すべくエツ
ジオーバーコートの発生要因であるストリップエツジ部
での溶融金属の表面張力の作用に着目しエツジオーバー
コートを防止する方法を提供するものである。In order to solve the above-mentioned problems of the prior art, the present invention provides a method for preventing edge overcoat by focusing on the action of the surface tension of molten metal at the strip edges, which is the cause of edge overcoat. be.
（課題を解決するための手段）
本発明者は、ストリップ面上の液膜流れに関し種々の実
験、研究を行った結果、エツジオーバーコートの発生に
関し以下の知見を得た。(Means for Solving the Problems) As a result of various experiments and studies regarding the flow of a liquid film on a strip surface, the present inventors obtained the following knowledge regarding the occurrence of edge overcoat.
すなわち、第３図に示すごとく、
■ ガスワイピングスされ所定の膜厚に絞られたがまだ
未凝固の付着液体膜に表面張力が働く。That is, as shown in FIG. 3, (1) Surface tension acts on the adhered liquid film that has been gas wiped and reduced to a predetermined thickness, but is still unsolidified.
■ この表面張力によりストリップの端面に付着してい
る液体がストリップ表裏面に回り込む。■ Due to this surface tension, the liquid adhering to the end surface of the strip wraps around to the front and back surfaces of the strip.
■ ストリップ表裏面側に回り込んだ液体によりエツジ
部の付着膜厚がストリップ中央部より厚くなり、液膜内
の速度分布も異なる。すなわち、ストリップに随伴し上
昇する液膜表面の流速は、液膜厚さが薄いストリップ中
央部に比べ液膜厚さが厚いエツジ部で遅くなる。■ Due to the liquid that has flowed around to the front and back sides of the strip, the thickness of the deposited film at the edges is thicker than that at the center of the strip, and the velocity distribution within the liquid film is also different. That is, the flow velocity on the surface of the liquid film that increases along with the strip is slower at the edge portions where the liquid film is thicker than at the center portion of the strip where the liquid film is thinner.
■ 液膜表面流速が異なるために表裏面の液膜流とスト
リップへの衝突ワイピングジェットとの速度差に起因す
る摩擦応力がストリップ中央部とエツジ部で異なる。す
なわち、液膜表裏面において上方向に働く摩擦応力は、
ストリップ中央部に比ベエッジ部で大きくなる。■ Because the surface flow velocity of the liquid film is different, the frictional stress caused by the difference in speed between the liquid film flow on the front and back surfaces and the wiping jet impinging on the strip is different between the center part and the edge part of the strip. In other words, the frictional stress acting upward on the front and back surfaces of the liquid film is
It becomes larger at the edges compared to the center of the strip.
■ ストリップ中央部とエツジ部での摩擦応力の差によ
りストリップの幅方向に摩擦応力の分力が生じる。そし
て、この摩擦応力の分力と表面張力が釣り合い、エツジ
オーバーコートはストリップエツジより一定の位置に発
生する。■ Due to the difference in frictional stress between the center and edge of the strip, a component of the frictional stress is generated in the width direction of the strip. Then, the component force of this frictional stress and the surface tension are balanced, and the edge overcoat is generated at a certain position from the strip edge.
以上述べたように、エツジオーバーコートは、ストリッ
プの端面に付着する液体の表面張力に起因して発生する
。As described above, edge overcoat occurs due to the surface tension of the liquid adhering to the end surface of the strip.
本発明は上記した知見に基づいて成されたものであり、
溶融めっき金属洛中に浸漬され、表裏面にめっき金属を
付着された鋼板の前記表裏面をガスワイピングしてめっ
き厚さを所定の厚さに制御し、溶戦めっき鋼板を製造す
る際におけるエツジオーバーコートの防止方法であって
、ワイピングノズルの下流側で、かつ鋼板に付着しため
っき金属が凝固する迄の間において、鋼板の両端面にの
み付着しためっき金属を除去するものである。The present invention has been made based on the above-mentioned findings,
Edge over when manufacturing a hot-dip galvanized steel plate by gas wiping the front and back surfaces of a steel plate that is immersed in a hot-dip metal coating and coated with plated metal to control the plating thickness to a predetermined thickness. This is a coating prevention method that removes the plated metal that adheres only to both end surfaces of the steel plate downstream of the wiping nozzle and until the plated metal that adheres to the steel plate solidifies.
（作 用）
したがって、ストリップの端面部の付着液体Ａを除去す
れば、ストリップエツジ部での液体付着状況は第２図に
示すごとくなりエツジオーバーコートは発生しない。(Function) Therefore, if the liquid A adhering to the end face of the strip is removed, the liquid adhesion situation at the strip edge will be as shown in FIG. 2, and no edge overcoat will occur.
ストリップの端面部の付着液体を除去する方法としては
、溶融金属めっき浴から連続的に引き上げられガスワイ
ピング等の絞り装置によりめっき厚さを制御された後、
めっき金属が凝固するまでの間においてストリップの端
面の付着めっき金属を掻き取る方法あるいは吸引する方
法が考えられる。The method for removing the adhering liquid on the end surface of the strip is to continuously pull it out of the molten metal plating bath and control the plating thickness with a squeezing device such as gas wiping.
A possible method is to scrape off or suction the adhering plated metal from the end surface of the strip until the plated metal solidifies.
（実 施 例）
以下本発明の実施例について図面を参照しながら説明す
る。(Example) Examples of the present invention will be described below with reference to the drawings.
第１図において、３はストリップであり゛、溶融金属め
っき洛中を通過し一定の速度で連続的に引き上げられた
後、一対のワイピングノズル１．１゛からのガスジェッ
トにより過剰に付着しためっき金属を絞り取られ、一定
のめっき厚さに制御される。In Fig. 1, numeral 3 is a strip that passes through a molten metal plating medium and is continuously pulled up at a constant speed. is squeezed out and controlled to a constant plating thickness.
６は前記ワイピングノズル１．１′の上方で、かつスト
リップ３に付着しためっき金属が凝固する迄の位置に配
置され、ストリップ３の端面に付着しためっき金属を掻
き取るナイフであり、押し付は装置７によって前記端面
に押し当てられる。A knife 6 is placed above the wiping nozzle 1.1' and at a position until the plated metal adhering to the strip 3 solidifies, and is used to scrape off the plated metal adhering to the end surface of the strip 3. It is pressed against said end face by means of a device 7.
この押し付は装置７は、一定の力でストリップ３の端面
に押し当てるためにタッチロール８を備え、ストリップ
３の走行に伴う板振れに追従するようストリップ３の端
面を検知し、押し付は力を制御するように成されている
。This pressing device 7 includes a touch roll 8 to press the end surface of the strip 3 with a constant force, and detects the end surface of the strip 3 so as to follow the deflection as the strip 3 runs. It is designed to control power.
下記表は、上記本発明方法により製造された溶融亜鉛め
っき鋼板のエツジオーバーコート発生状況を、従来法す
なわち第４図に示す方法で製造されたものと比較して示
したものである。The table below shows the occurrence of edge overcoat in hot-dip galvanized steel sheets manufactured by the method of the present invention in comparison with those manufactured by the conventional method, that is, the method shown in FIG. 4.
なお、従来法におけるワイピングノズルのスリットギャ
ップは中央で１ｍｍ、両サイドで１．２閣である。The slit gap of the wiping nozzle in the conventional method is 1 mm at the center and 1.2 mm at both sides.
上記表からも判かるように本発明法では、エツジオーバ
ーコートは完全に防止され、エツジ部の目付量はストリ
ップ中央部とほぼ等しくなっている。As can be seen from the above table, in the method of the present invention, edge overcoat is completely prevented, and the basis weight of the edge portion is approximately equal to that of the center portion of the strip.
また、亜鉛めっき鋼板の表面品質およびめっき密着性に
ついては、それぞれ外観目視観察および１８０ ’曲げ
後のテープ剥離を行った結果、本実施例による製品と従
来法による製品とに差異は認められなかった。Regarding the surface quality and plating adhesion of the galvanized steel sheet, as a result of visual observation of the appearance and tape peeling after 180' bending, no differences were observed between the product made in this example and the product made by the conventional method. .
（発明の効果）
以上説明したように、本発明方法は、ワイピンクリズル
の下流側で、かつ鋼板に付着しためっき金属が凝固する
迄の間において、鋼板の両端面にのみ付着しためっき金
属を除去するものである為、溶融めっき鋼板において表
面品質およびめっき密着性になんら影響を与えることな
くエツジオーバーコートを完全に防止することが可能で
あり、連続溶融めっき鋼板製造設備に用いて非常に有効
である。(Effects of the Invention) As explained above, the method of the present invention removes the plated metal attached only to both end faces of the steel plate on the downstream side of the wiper crizzle and until the plated metal attached to the steel plate solidifies. Because it is a hot-dip galvanized steel sheet, it is possible to completely prevent edge overcoat without affecting the surface quality and plating adhesion in any way, making it extremely effective when used in continuous hot-dip galvanizing steel sheet production equipment. .
第１図は本発明方法の一実施例を示す斜視図、第２図は
本発明方法によって製造された溶融金属めっき鋼板の目
付状況を示す断面図、第３図はエツジオーバーコートの
発生状況を説明するための模式図、第４図、第５図およ
び第６図はそれぞれ従来のエツジオーバーコート防止法
を示す斜視図である。
１、ｌ゛はワイピングノズル、３はストリップ、６はナ
イフ、７は押し付は装置。Fig. 1 is a perspective view showing an embodiment of the method of the present invention, Fig. 2 is a cross-sectional view showing the area weight of a hot-dip metal-plated steel sheet manufactured by the method of the present invention, and Fig. 3 shows the occurrence of edge overcoat. The schematic drawings for explanation, FIGS. 4, 5, and 6 are perspective views showing conventional edge overcoat prevention methods, respectively. 1 and 1 are wiping nozzles, 3 is a strip, 6 is a knife, and 7 is a pressing device.
Claims (1)
金属を付着された鋼板の前記表裏面をガスワイピングし
てめっき厚さを所定の厚さに制御し、溶融めっき鋼板を
製造する際におけるエッジオーバーコートの防止方法で
あって、ワイピングノズルの下流側で、かつ鋼板に付着
しためっき金属が凝固する迄の間において、鋼板の両端
面にのみ付着しためっき金属を除去することを特徴とす
る溶融めっきのエッジオーバーコート防止方法。(1) When producing a hot-dip plated steel plate by gas wiping the front and back surfaces of the steel plate, which is immersed in a hot-dip metal solution and coated with plated metal, the plating thickness is controlled to a predetermined thickness. A method for preventing edge overcoat, which is characterized by removing plated metal attached only to both end surfaces of a steel plate on the downstream side of a wiping nozzle and before the plated metal attached to the steel plate solidifies. Method for preventing edge overcoat in hot-dip plating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63199515A JP2757381B2 (en) | 1988-08-09 | 1988-08-09 | Method for preventing edge overcoat of hot-dip plating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63199515A JP2757381B2 (en) | 1988-08-09 | 1988-08-09 | Method for preventing edge overcoat of hot-dip plating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0247247A true JPH0247247A (en) | 1990-02-16 |
| JP2757381B2 JP2757381B2 (en) | 1998-05-25 |
Family
ID=16409106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63199515A Expired - Fee Related JP2757381B2 (en) | 1988-08-09 | 1988-08-09 | Method for preventing edge overcoat of hot-dip plating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2757381B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100423871B1 (en) * | 1999-12-24 | 2004-03-22 | 주식회사 포스코 | Removal device of swarf which is adhered to strip side |
| CN116103596A (en) * | 2023-04-04 | 2023-05-12 | 天津市宇润德金属制品有限公司 | Production process for coating steel coil |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4855832A (en) * | 1971-11-17 | 1973-08-06 |
-
1988
- 1988-08-09 JP JP63199515A patent/JP2757381B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4855832A (en) * | 1971-11-17 | 1973-08-06 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100423871B1 (en) * | 1999-12-24 | 2004-03-22 | 주식회사 포스코 | Removal device of swarf which is adhered to strip side |
| CN116103596A (en) * | 2023-04-04 | 2023-05-12 | 天津市宇润德金属制品有限公司 | Production process for coating steel coil |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2757381B2 (en) | 1998-05-25 |
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| LAPS | Cancellation because of no payment of annual fees |