JPH03166351A - Method for controlling bottom dross in hot dip galvanizing bath - Google Patents
Method for controlling bottom dross in hot dip galvanizing bathInfo
- Publication number
- JPH03166351A JPH03166351A JP30337089A JP30337089A JPH03166351A JP H03166351 A JPH03166351 A JP H03166351A JP 30337089 A JP30337089 A JP 30337089A JP 30337089 A JP30337089 A JP 30337089A JP H03166351 A JPH03166351 A JP H03166351A
- Authority
- JP
- Japan
- Prior art keywords
- dross
- bath
- dip galvanizing
- gas
- plating bath
- 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
- 238000005246 galvanizing Methods 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 17
- 239000010959 steel Substances 0.000 claims abstract description 17
- 238000007747 plating Methods 0.000 claims abstract description 14
- 238000007664 blowing Methods 0.000 claims abstract description 8
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 4
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 claims description 4
- 230000001629 suppression Effects 0.000 claims 1
- 238000005275 alloying Methods 0.000 abstract description 6
- 238000009825 accumulation Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 20
- 239000007789 gas Substances 0.000 description 13
- 239000011701 zinc Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000003287 bathing Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 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、溶融亜鉛メッキ浴中のボトムドロス抑制方法
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 for suppressing bottom dross in a hot-dip galvanizing bath.
（従来技術と発明の解決しようとする課題）溶融亜鉛メ
ッキ浴中のドロスには．Ｚｎ−Ｆｅ−ＡＱ系とＺｎ −
Ｆｅ系があり、Ｚｎ − Ｆｅ − Ａ Ｑ系のドロ
スは浴表面へ浮上することから容易に除去できるが、Ｚ
ｎ − Ｆｅ系のドロスは，浴底へ堆積するいわゆるボ
トムドロスとなる。(Prior art and problems to be solved by the invention) Dross in hot-dip galvanizing baths. Zn-Fe-AQ system and Zn −
Zn-Fe-A Q-based dross floats to the bath surface and can be easily removed;
The n-Fe-based dross becomes so-called bottom dross that accumulates on the bottom of the bath.
しかして、浴中のドロス除去としては、浴表面に位置（
浮遊）したドロスを機械的に除去する（実開昭６０−１
２２３５８号）、又浴の一部を連続的に取出し、フィル
ターでろ過し、ドロスを除去して浴へ連続的に戻す（特
開昭６３−５０４５４号）こと等が開示されている。However, in order to remove dross from the bath, it is necessary to remove dross from the bath surface.
Mechanically removing dross (floating)
22358), and also discloses that a portion of the bath is continuously taken out, filtered, dross removed, and continuously returned to the bath (Japanese Patent Laid-Open No. 63-50454).
このようなドロス除去においても上記のごときボトムド
ロスの除去又は抑制はできず、ドロス量が増加すると、
浴中に配置しているシンクロールの回転（特に高速通板
時）による浴流れにより、大量のボトムドロスが浴中に
飛散しメッキ鋼帯に大量に付着し品質を劣化する等の欠
点をともなうものである。Even in this type of dross removal, it is not possible to remove or suppress the bottom dross as described above, and when the amount of dross increases,
A large amount of bottom dross is scattered in the bath due to the rotation of the sink roll placed in the bath (especially during high-speed threading), and a large amount of bottom dross adheres to the plated steel strip, resulting in deterioration of quality. It is.
（課題を解決するための手段）
本発明は、溶融亜鉛メッキ後加熱処理して鉄一亜鉛合金
メッキ鋼板を製造するに際し、メッキ浴底部からガスを
吹込みＺｎ − Ｆｅ系ドロスを浮上せしめることを特
徴とする溶融亜鉛メッキ浴中のボトムドロス抑制方法に
関するものである。(Means for Solving the Problems) The present invention involves blowing gas from the bottom of the plating bath to float Zn-Fe dross when heat-treating after hot-dip galvanizing to produce an iron-zinc alloy plated steel sheet. The present invention relates to a method for suppressing bottom dross in a hot-dip galvanizing bath.
即ち、本発明においては、浴底部からガスを吹込みＺｎ
− Ｆｅ系のドロス、つまり、浴底部へ堆積するドロ
スあるいは僅かに堆積したドロスを浮上（浮遊）させる
ものであり、吹込ガスとしては、浴の酸化を防止するた
め、例えば、窒素ガス等の不活性ガスが好ましく、吹込
み方法としては、例えば、浴槽底部にポーラスプラグを
配設して、吹込むことにより、微細ガス気泡を広範囲に
分散させることができる。又はガス導管先端にプラグを
設け，浴上部から浴底部へ浸漬配置しガスを吹込む。That is, in the present invention, gas is blown from the bottom of the bath to remove Zn.
- Fe-based dross, that is, dross deposited at the bottom of the bath or slightly deposited dross, is floated (floated), and the blown gas is a non-containing gas such as nitrogen gas to prevent oxidation of the bath. Active gas is preferable, and the method of blowing in it is, for example, by disposing a porous plug at the bottom of the bathtub and blowing into it, so that fine gas bubbles can be dispersed over a wide range. Alternatively, a plug is installed at the end of the gas conduit, and the gas is blown into the bath by submerging it from the top of the bath to the bottom.
しかして、このようにして浮上せしめたドロスは、浴中
のＡＱを取り込みＺｎ − Ｆｅ − Ａ （ｌ 系
のトップドロスとなるが一部のＺｎ − Ｆｅ系ドロス
は，ほゾ常時ガス吹込みにより僅かなドロスが浮上（浮
遊）しており、例えば、亜鉛メッキ後、加熱合金化処理
して鉄一亜鉛合金メッキ鋼板とする場合は、多少Ｚｎ
− Ｆｅ系（ボトムドロス）がメッキ鋼板に付着しても
外観を損う等の実害はほとんど発生せず，従って浴内で
発生するＺｎ − Ｆｅ系ドロスはメッキ鋼板に付着し
浴外へ持出されることになり、浴内でのドロス（Ｚｎ−
Ｆｅ系）の増大はほとんどなく操業を続行できる。The dross floated in this way absorbs AQ in the bath and becomes Zn-Fe-A (l)-based top dross, but some Zn-Fe-based dross is A small amount of dross is floating (floating), and for example, when heat alloying is performed after zinc plating to make an iron-zinc alloy plated steel sheet, some Zn
- Even if Fe-based (bottom dross) adheres to the plated steel plate, there is almost no actual damage such as damage to the appearance; therefore, the Zn-Fe-based dross generated in the bath adheres to the plated steel plate and is carried out of the bath. As a result, dross (Zn-
The operation can be continued with almost no increase in the amount of iron (Fe-based).
次に本発明方法の一例を図面により説明する。Next, an example of the method of the present invention will be explained with reference to the drawings.
第１図において、溶融亜鉛メッキ浴槽↑内のメッキ浴３
へ渭ｆ２を導き、メッキを施し、ノズル４からのガス吹
付けにより付着量制御後、合金化炉５で加熱合金化（Ｚ
ｎ − Ｆｅ）処理する、一方メッキ浴３底部にポーラ
スプラグ１４を配設し、ガスを浴３中へ吹込みＺｎ −
Ｆｅ系ドロスをＡＱと反応しドップドロスに変換し浮
上せしめ底部への堆積を防止するとともに浮上ドロスは
鋼帯２に付着し，上記のごとく、合金化処理時にメッキ
金属とともに合金化される。In Figure 1, plating bath 3 in the hot-dip galvanizing bath ↑
After guiding the wei f2 to the plate and applying plating, and controlling the coating amount by blowing gas from the nozzle 4, it is heated and alloyed in the alloying furnace 5 (Z
On the other hand, a porous plug 14 is placed at the bottom of the plating bath 3, and gas is blown into the bath 3 to process Zn-Fe).
The Fe-based dross reacts with AQ, converts it into doped dross, floats it, and prevents it from being deposited on the bottom, and the floating dross adheres to the steel strip 2 and is alloyed with the plating metal during the alloying process, as described above.
（実施例） 次に本発明の実施例を挙げる。(Example) Next, examples of the present invention will be given.
実施例
■）亜鉛メッキ浴：深さ２０００ｎ＊ｎ． ｒｆｌ２５
００ｎｎ、長さ３０００ｎｎ，
２）メッキ鋼帯 ：板厚０．６ｍｍ．巾］．２００ｍｍ
、３）メッキ浴組或： Ａ Ｑ Ｏ．１２％±０．０２
％、残Ｚｎ及び不純物（浴温４７０℃）
４）鋼帯在浴時間：３．０秒（通板速度１１０ｍ／分）
５）浴底部ポーラスプラグ面積：０．１６ｍ（円形）６
）ボーラスプラグ：気孔率ｌ８％、平均気孔径１０μ圏
７）ガス（窒素ガス常温）吹込量：０，４Ｎｒｎ’／分
。Example ■) Galvanizing bath: depth 2000n*n. rfl25
00nn, length 3000nn, 2) Plated steel strip: plate thickness 0.6mm. Width]. 200mm
, 3) Plating bath assembly: A Q O. 12%±0.02
%, remaining Zn and impurities (bath temperature 470°C) 4) Steel strip bathing time: 3.0 seconds (threading speed 110 m/min)
5) Bath bottom porous plug area: 0.16m (circular) 6
) Bolus plug: porosity 18%, average pore diameter 10 μm 7) Gas (nitrogen gas at room temperature) injection rate: 0.4 Nrn'/min.
このような条件で亜鉛メッキ鋼板を製造し、浴上部で気
体吹付けにより、３０ｇ／ｒｙｆのメッキ付着量制御後
合金化炉へ導き、板温４８０℃×１５秒で合金化処理し
、メッキ金属中の鉄量９〜１１％の鉄一亜鉛合金メッキ
鋼板（帯）を製造し、連続１６８時間操業した時点でメ
ッキ浴浴底部でのドロス堆積・はほとんどなく、 又浴
中のＦｅは０．０１８％と少なく浴中Ｚｎ − Ｆｅ系
ドロスもほとんど無く、発生ドロスは、ほとんどメッキ
鋼帯に付着し浴外へ持出され，これによる合金メッキ鋼
帯表面の劣化もなかった。A galvanized steel sheet is produced under these conditions, and after controlling the amount of coating at 30g/ryf by blowing gas at the top of the bath, it is led to an alloying furnace, where it is alloyed at a sheet temperature of 480°C for 15 seconds, and the plated metal is After manufacturing an iron-zinc alloy plated steel plate (strip) with an iron content of 9 to 11%, and operating continuously for 168 hours, there was almost no dross deposited at the bottom of the plating bath, and the Fe content in the bath was 0. There was almost no Zn-Fe-based dross in the bath, and most of the generated dross adhered to the plated steel strip and was taken out of the bath, and the surface of the alloy-plated steel strip did not deteriorate as a result.
比較例
実施例と同条件で操業し、浴底部からのガス吹込を行な
うことなく、１６８時間連続操業中に２回大量のＺｎ
− Ｆｅ系ドロスがメッキ鋼帯表面に付着し品質を劣化
した。Ｚｎ − Ｆｅ系ドロスが底部に堆積し、その１
部がシンクロールの回転による浴流により大量に浮上（
浮遊）し、メッキ鋼帯に付着したものと認められる。Comparative Example Operating under the same conditions as the example, without blowing gas from the bottom of the bath, a large amount of Zn was injected twice during 168 hours of continuous operation.
- Fe-based dross adhered to the surface of the plated steel strip, deteriorating its quality. Zn-Fe-based dross is deposited at the bottom, part 1
A large amount of water floats up (
(floating) and adhered to the plated steel strip.
（発明の効果）
本発明によれば、浴底部のドロス堆積を確実に防止する
ことができ，Ｚｎ−Ｆｅ系ドロスによるメッキ鋼帯への
付着がなく、ドロス付着による品質劣化を確実に防止で
きる。又Ｚｎ − Ｆｅ系ドロスが堆積しないので、ド
ロス（Ｆｅ）によるＺｎ（浴）の取込みがなく浴の歩留
を向」ニすることができる等の優れた効果が得られる。(Effects of the Invention) According to the present invention, dross accumulation at the bottom of the bath can be reliably prevented, Zn-Fe-based dross does not adhere to the plated steel strip, and quality deterioration due to dross adhesion can be reliably prevented. . In addition, since no Zn--Fe dross is deposited, excellent effects such as no Zn (bath) being taken up by dross (Fe) and improved bath yield can be obtained.
【図面の簡単な説明】 第↓図は本発明の実施例を示す説明図である。[Brief explanation of the drawing] Figure ↓ is an explanatory diagram showing an embodiment of the present invention.
Claims (1)
キ鋼板を製造するに際し、メッキ浴底部からガスを吹込
みＺｎ−Ｆｅ系ドロスを浮上せしめることを特徴とする
溶融亜鉛メッキ浴中のボトムドロス抑制方法。1) Bottom dross in a hot-dip galvanizing bath characterized by blowing gas from the bottom of the plating bath to float Zn-Fe dross when heat-treating after hot-dip galvanizing to produce an iron-zinc alloy plated steel sheet. Suppression method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30337089A JPH03166351A (en) | 1989-11-24 | 1989-11-24 | Method for controlling bottom dross in hot dip galvanizing bath |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30337089A JPH03166351A (en) | 1989-11-24 | 1989-11-24 | Method for controlling bottom dross in hot dip galvanizing bath |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03166351A true JPH03166351A (en) | 1991-07-18 |
Family
ID=17920181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30337089A Pending JPH03166351A (en) | 1989-11-24 | 1989-11-24 | Method for controlling bottom dross in hot dip galvanizing bath |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03166351A (en) |
-
1989
- 1989-11-24 JP JP30337089A patent/JPH03166351A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4256929B2 (en) | Zinc plating method and system | |
| US4390377A (en) | Novel continuous, high speed method of galvanizing and annealing a continuously travelling low carbon ferrous wire | |
| US4285995A (en) | Process for increasing alloying rate of galvanized coating on steel | |
| US4173663A (en) | Dipless metallizing process and apparatus | |
| JP3385970B2 (en) | Manufacturing method of galvannealed steel sheet with excellent surface appearance | |
| JP3387415B2 (en) | Manufacturing method of galvannealed steel sheet with excellent surface appearance | |
| JPH03166351A (en) | Method for controlling bottom dross in hot dip galvanizing bath | |
| JPH07157853A (en) | Method for removing zinc fume in snout of hot dip metal coating and device therefor | |
| CA2107560C (en) | Al-si-cr-plated steel sheet excellent in corrosion resistance and production thereof | |
| JPH08170160A (en) | Production of silicon-containing high tensile strength hot dip galvanized or galvannealed steel sheet | |
| JPH03166352A (en) | Method for controlling bottom dross in hot dip galvanizing bath | |
| JPH07150320A (en) | Hot dip metal coating method and device thereof | |
| JPH03150338A (en) | Production of continuous alloying hot dip galvanized steel sheet | |
| JPH0860327A (en) | Manufacture of galvannealed steel sheet | |
| JPH0860329A (en) | Production of galvannealed steel sheet | |
| JPH03211263A (en) | Equipment for producing hot dip galvanized steel sheet | |
| KR100356687B1 (en) | Impurity removal method of alloying hot dip galvanizing bath | |
| JPH083706A (en) | Method for producing hot-dip metal plated steel sheet and device therefor | |
| JPS62185864A (en) | Hot dipping method | |
| KR19990011061A (en) | Manufacturing method of alloyed hot dip galvanized steel sheet with excellent paintability | |
| JPH03134146A (en) | Continuous hot dip metal plating method | |
| JP3482739B2 (en) | Manufacturing method of hot-dip galvanized steel sheet | |
| JPH0248617B2 (en) | ||
| JPH0463257A (en) | Hot-dip metal coating method | |
| JPH07145465A (en) | Hot dip metal coating method and device |