JP2583982B2 - Method for forming oxide film on galvannealed steel sheet - Google Patents
Method for forming oxide film on galvannealed steel sheetInfo
- Publication number
- JP2583982B2 JP2583982B2 JP63165921A JP16592188A JP2583982B2 JP 2583982 B2 JP2583982 B2 JP 2583982B2 JP 63165921 A JP63165921 A JP 63165921A JP 16592188 A JP16592188 A JP 16592188A JP 2583982 B2 JP2583982 B2 JP 2583982B2
- Authority
- JP
- Japan
- Prior art keywords
- oxide film
- steel sheet
- dew point
- galvannealed steel
- forming oxide
- 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.)
- Expired - Lifetime
Links
Landscapes
- Coating With Molten Metal (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、溶融合金化亜鉛メッキ鋼板の酸化膜生成方
法に関するものである。The present invention relates to a method for forming an oxide film on a galvannealed steel sheet.
［従来の技術］ 溶融合金性亜鉛メッキ鋼板の溶接性を向上するため、
その表面にZnO含有の酸化膜を生成することが知られて
いる（特開昭59−104463号公報）。しかして、このよう
なZnO系の酸化膜を工業的規模で、確実に生成すること
が、最も重要なことであり、強く要求されているところ
である。[Prior art] To improve the weldability of hot-dip galvanized steel sheet,
It is known that a ZnO-containing oxide film is formed on the surface (JP-A-59-104463). It is of the utmost importance that such a ZnO-based oxide film is reliably produced on an industrial scale, and is being strongly demanded.
［発明が解決しようとする課題］ 本発明は、このような要求を有利に満足する優れたZn
O系酸化膜の生成方法を提供するものである。[Problems to be Solved by the Invention] The present invention provides an excellent Zn which advantageously satisfies such a demand.
An object of the present invention is to provide a method for forming an O-based oxide film.
［課題を解決するための手段］ 本発明は、溶融亜鉛メッキ鋼板を加熱し、合金化処理
後、霧化水と溶接せしめ450℃以下に冷却し、次いで40
℃以上の高露点雰囲気と接触し、表面に酸化膜を生成す
ることを特徴とする溶融合金化亜鉛メッキ鋼板の酸化膜
生成方法に関するものである。[Means for Solving the Problems] The present invention relates to a method for heating a hot-dip galvanized steel sheet, performing alloying treatment, welding with atomized water, cooling to 450 ° C. or less,
The present invention relates to a method for forming an oxide film on a hot-dip galvanized steel sheet, which is in contact with an atmosphere having a high dew point of not less than ° C. to form an oxide film on the surface.
本発明における溶融合金化亜鉛メッキ鋼板としては、
例えば溶融亜鉛メッキ後、加熱し、熱拡散により鋼板の
鉄がメッキ層中へ拡散し、メッキ層中の鉄量が７〜15
％、メッキ付着量20〜80g/m2のメッキ鋼板である。As the hot-dip galvanized steel sheet in the present invention,
For example, after hot-dip galvanizing, it is heated and the iron of the steel sheet diffuses into the plating layer by thermal diffusion, and the iron amount in the plating layer is 7 to 15%.
%, A plated steel sheet having a coating weight of 20 to 80 g / m 2 .
しかして、このようなメッキ鋼板においては、一般に
溶融亜鉛メッキ後、板温480〜530℃で、数秒〜十数秒間
加熱するものであり、本発明においては、加熱後450℃
以下に霧化水と接触して冷却する。即ち、メッキ鋼板
（帯）が合金化炉を出た後、速やかに合金化反応を終了
させることによって、次の酸化膜生成が早期に行なわれ
るようにするものであり、450℃超であると僅かではあ
るが合金化反応が起っており、酸化膜生成が起りにくく
好ましくない。Thus, such a coated steel sheet is generally heated at a sheet temperature of 480 to 530 ° C. for several seconds to several tens of seconds after hot-dip galvanizing, and in the present invention, 450 ° C. after heating.
It cools by contacting atomized water below. That is, after the plated steel sheet (belt) exits the alloying furnace, the alloying reaction is immediately terminated so that the next oxide film is formed at an early stage. Although the alloying reaction occurs slightly, an oxide film is not easily formed, which is not preferable.
霧化水としては、水を霧化状にしたもの、又は気水混
合で霧化状にしたものを用いることができる。As the atomized water, water that has been atomized or water that has been atomized by mixing water and water can be used.
このようにして冷却するメッキ鋼板の下限温度として
は、100℃が好ましい。即ち冷却に引続き高露点雰囲気
に接触せしめて、表面に酸化膜を生成せしめるに際し、
メッキ鋼板が高温である程酸化膜生成が容易になり、10
0℃未満になると高速ラインにおいては、確実な酸化膜
の生成が難しくなり、高速ラインでは好ましくない。The lower limit temperature of the plated steel sheet cooled in this manner is preferably 100 ° C. In other words, following cooling, contact with a high dew point atmosphere to generate an oxide film on the surface,
The higher the temperature of the coated steel sheet, the easier it is to form an oxide film.
If the temperature is lower than 0 ° C., it is difficult to reliably form an oxide film on a high-speed line, which is not preferable on a high-speed line.
次に酸化膜を生成するための高露点雰囲気（ガス）と
しては、例えば、霧化水または水蒸気に合金化炉の燃焼
排ガスを混入して、40℃以上の露点雰囲気とし、上記の
ごとく合金化処理して冷却したメッキ鋼板と接触せし
め、ZnO含有酸化膜を生成するものであり、露点が40℃
未満であると、酸化膜の生成が遅く、連続処理ライン
（とくに高速ライン）では好ましくない。Next, as a high dew point atmosphere (gas) for forming an oxide film, for example, mixing the combustion exhaust gas of the alloying furnace with atomizing water or steam to form a dew point atmosphere of 40 ° C. or higher, and alloying as described above Contact with the treated and cooled plated steel sheet to form a ZnO-containing oxide film with a dew point of 40 ° C
If it is less than 1, the formation of an oxide film is slow, which is not preferable in a continuous processing line (especially a high-speed line).
しかして、このような高露点雰囲気帯は、冷却後のメ
ッキ鋼板（帯）通板位置に１ヶ所又は２ヶ所設け、上記
のごとき雰囲気とし、メッキ鋼板と接触して酸化膜を生
成するものである。Thus, such a high dew point atmosphere zone is provided at one or two places at the passing position of the plated steel sheet (band) after cooling, and the atmosphere is set as described above, and an oxide film is generated by contact with the plated steel sheet. is there.
酸化膜の生成量としては、10〜3000mg/m2で、例えば
スポット溶接電極が溶接時の発熱により、メッキ金属が
溶解付着するのを確実に阻止することができる。The generation amount of the oxide film is 10 to 3000 mg / m 2. For example, it is possible to reliably prevent the plating metal from melting and adhering to the spot welding electrode due to heat generated during welding.
次に本発明の一例を図面により説明する。 Next, an example of the present invention will be described with reference to the drawings.
図面において、鋼帯１を溶融亜鉛浴２へ導きメッキ
後、ノズル３からガスを噴射し、所定付着量に制御した
後、合金化炉４へ導き、加熱してメッキ金属を合金化処
理する。In the drawing, after a steel strip 1 is introduced into a molten zinc bath 2 and plated, a gas is injected from a nozzle 3 to control the amount to a predetermined amount, and then guided to an alloying furnace 4 where it is heated to alloy the plated metal.
次いで冷却帯５で霧化水と接触して450℃以下に冷却
し、次いで、高露点雰囲気帯６で、40℃以上の露点雰囲
気と接触せしめ酸化膜を生成する。Next, it is cooled to 450 ° C. or lower by contact with atomized water in a cooling zone 5 and then brought into contact with a dew point atmosphere of 40 ° C. or higher in a high dew point atmosphere zone 6 to form an oxide film.
即ち、合金化炉４の排ガスをブロワークを介して供給
管８から高露点雰囲気帯６へ導き、一方供給管8aから霧
化水又は水蒸気を雰囲気帯６へ供給し、40℃以上の高露
点雰囲気とする。That is, the exhaust gas of the alloying furnace 4 is guided from the supply pipe 8 to the high dew point atmosphere zone 6 through the blowwork, while atomizing water or steam is supplied from the supply pipe 8a to the atmosphere zone 6, and the high dew point atmosphere of 40 ° C. or more is supplied. And
更に例えば、高速ライン、酸化膜量の増量等、必要に
応じて、高露点雰囲気帯6aで同様に40℃以上の高露点雰
囲気と接触せしめて、より酸化膜を確実に生成せしめる
ものである。Further, for example, if necessary, such as a high-speed line or an increase in the amount of an oxide film, the oxide film is brought into contact with a high dew point atmosphere of 40 ° C. or more in the high dew point atmosphere zone 6a to more reliably generate an oxide film.
しかして、メッキラインによっては、高露点雰囲気帯
６及び／又は6aを設備配置するものである。Depending on the plating line, the high dew point atmosphere zone 6 and / or 6a may be provided.
［実 施 例］ 次に本発明の実施例を比較例とともに第１表に挙げ
る。[Examples] Next, examples of the present invention are listed in Table 1 together with comparative examples.
［発明の効果］ かくすることにより、スポット溶接等を向上する酸化
膜を確実に、しかも工業的規模で安定して生成すること
ができる等の優れた効果が得られる。 [Effects of the Invention] By doing so, an excellent effect such that an oxide film for improving spot welding or the like can be surely formed and stably formed on an industrial scale can be obtained.
第１図は、本発明の一例を示す説明図である。 1:鋼帯、5:冷却帯 6:高露点雰囲気帯 FIG. 1 is an explanatory diagram showing an example of the present invention. 1: Steel strip, 5: Cooling zone 6: High dew point atmosphere zone
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大河内 敏博 愛知県東海市東海町５―３ 新日本製鐵 株式会社名古屋製鐵所内 (56)参考文献 特開 昭63−230861（ＪＰ，Ａ) 特開 平１−100252（ＪＰ，Ａ) 特開 平１−100251（ＪＰ，Ａ) 特開 平１−108358（ＪＰ，Ａ) ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshihiro Okochi 5-3 Tokai-cho, Tokai-city, Aichi Prefecture Nippon Steel Corporation Nagoya Works (56) References JP-A-63-230861 (JP, A) Japanese Patent Laid-Open No. 1-100252 (JP, A) Japanese Patent Laid-Open No. 1-100251 (JP, A) Japanese Patent Laid-Open No. 1-108358 (JP, A)
Claims (1)
後、霧化水と接触せしめ450℃以下に冷却し、次いで40
℃以上の高露点雰囲気と接触し、表面に酸化膜を生成す
ることを特徴とする溶融合金化亜鉛メッキ鋼板の酸化膜
生成方法。1. A hot-dip galvanized steel sheet is heated, alloyed, brought into contact with atomized water, cooled to 450 ° C. or less, and then
A method for forming an oxide film on a galvanized steel sheet by contacting with an atmosphere having a high dew point of not less than ℃ and forming an oxide film on the surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63165921A JP2583982B2 (en) | 1988-07-05 | 1988-07-05 | Method for forming oxide film on galvannealed steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63165921A JP2583982B2 (en) | 1988-07-05 | 1988-07-05 | Method for forming oxide film on galvannealed steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0219450A JPH0219450A (en) | 1990-01-23 |
| JP2583982B2 true JP2583982B2 (en) | 1997-02-19 |
Family
ID=15821543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63165921A Expired - Lifetime JP2583982B2 (en) | 1988-07-05 | 1988-07-05 | Method for forming oxide film on galvannealed steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2583982B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59104432A (en) * | 1982-12-06 | 1984-06-16 | Nippon Steel Corp | Preparation of zinc plated steel plate excellent in weldability |
| JPS61295362A (en) * | 1985-06-21 | 1986-12-26 | Sumitomo Metal Ind Ltd | Alloying treatment furnace |
-
1988
- 1988-07-05 JP JP63165921A patent/JP2583982B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0219450A (en) | 1990-01-23 |
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