JP3068392B2 - Manufacturing method of galvannealed steel sheet - Google Patents
Manufacturing method of galvannealed steel sheetInfo
- Publication number
- JP3068392B2 JP3068392B2 JP5289556A JP28955693A JP3068392B2 JP 3068392 B2 JP3068392 B2 JP 3068392B2 JP 5289556 A JP5289556 A JP 5289556A JP 28955693 A JP28955693 A JP 28955693A JP 3068392 B2 JP3068392 B2 JP 3068392B2
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- plating
- zinc
- temperature
- melting point
- 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 - Fee Related
Links
Landscapes
- Coating By Spraying Or Casting (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、合金化溶融亜鉛メッキ
鋼板の製造方法に関するものであり、更に詳しくは、N
iプレメッキを施した鋼板に対し、均一で高品位な合金
化溶融亜鉛メッキ鋼板を高い生産性で製造する方法に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a galvannealed steel sheet, and more particularly to a method for producing a galvannealed steel sheet.
The present invention relates to a method for producing a uniform and high-quality galvannealed steel sheet with high productivity for a steel sheet subjected to i-pre-plating.
【0002】[0002]
【従来の技術】鋼板を溶融亜鉛浴に浸した後、ガスワイ
ピング装置を用いて目的とする付着量に亜鉛付着量を制
御し、合金化炉で鋼板を加熱することにより合金化溶融
亜鉛メッキを製造する方法は、現在広く工業的に行われ
ている。また、溶融金属をスプレーにより微粒化し、こ
れを連続的に送られてくる帯状鋼板の表面に付着させて
めっきする、スプレーメッキ方法及び装置は、従来から
特開昭53−99047号公報、特開平1−20145
6号公報に示すように、前処理として鋼板を、還元性雰
囲気で連続的に加熱し清浄化した後、鋼板温度をメッキ
金属の融点以上に保持した状態でスプレーメッキを行う
技術がある。2. Description of the Related Art After a steel sheet is immersed in a molten zinc bath, the amount of zinc applied is controlled to a target amount by using a gas wiping device, and the steel sheet is heated in an alloying furnace to perform galvannealing. The production method is currently widely and industrially used. Further, a spray plating method and apparatus for atomizing a molten metal by spraying and attaching it to the surface of a continuously fed strip-shaped steel plate for plating are disclosed in JP-A-53-99047 and JP-A-53-99047. 1-22014
As disclosed in Japanese Patent Publication No. 6 (1994), there is a technique in which, as a pretreatment, a steel sheet is continuously heated and cleaned in a reducing atmosphere, and then spray plating is performed with the temperature of the steel sheet kept at a temperature equal to or higher than the melting point of the plated metal.
【0003】[0003]
【発明が解決しようとする課題】しかしながら、従来技
術であるガスワイピング法によりメッキ付着量を制御す
る溶融メッキ方法では、鋼板の通板速度を上げるに従
い、ワイピングガスの圧力を高くする必要がある。ワイ
ピングガス圧が高くなると、亜鉛が飛び散るスプラッシ
ュと呼ばれる現象が起こる。スプラッシュが起こると、
飛び散った亜鉛が鋼板あるいはガスワイピング装置に付
着し、メッキ品質の劣化あるいは最悪の場合はメッキ不
可能という事態に至る。従って、従来のガスワイピング
法による亜鉛メッキラインは、スプラッシュが発生しな
いラインスピード180mpm 以下でしか生産ができな
い。However, in the conventional hot-dip plating method for controlling the amount of plating by gas wiping, it is necessary to increase the pressure of the wiping gas as the sheet passing speed increases. When the wiping gas pressure increases, a phenomenon called splash, in which zinc is scattered, occurs. When a splash occurs,
The scattered zinc adheres to the steel plate or the gas wiping device, and the plating quality is deteriorated or, in the worst case, plating is impossible. Therefore, a galvanized line by the conventional gas wiping method can be produced only at a line speed of 180 mpm or less at which no splash occurs.
【0004】一方、スプレーメッキ方法では、スプラッ
シュ発生によるラインスピードの制約は発生しない。し
かし、特開昭53−99047号公報、特開平1−20
1456号公報によるスプレーメッキ方法では、メッキ
時の鋼板温度が高いため、メッキ実施中に亜鉛と鋼板の
合金化反応が起こる。On the other hand, in the spray plating method, there is no restriction on the line speed due to the occurrence of splash. However, JP-A-53-99047 and JP-A-1-20
In the spray plating method disclosed in Japanese Patent No. 1456, since the temperature of the steel sheet at the time of plating is high, an alloying reaction between zinc and the steel sheet occurs during plating.
【0005】そのため、鋼板と亜鉛との濡れ性が鋼板表
面内で不均一となり、亜鉛の不規則な流動が起こるため
均一なメッキ外観を得る事が極めて困難となる。このよ
うな不均一外観の亜鉛メッキ鋼板を合金化処理しても、
外観不均一はそのまま残存する事となり、高品質な合金
化溶融メッキ鋼板は得られない。また、合金化溶融亜鉛
メッキ鋼板を得るための再加熱条件については、従来の
溶融メッキ法の場合と異なっており、スプレーメッキ後
の再加熱条件にそのまま適用しても、高品位な合金化溶
融亜鉛メッキ鋼板は得られない。Therefore, the wettability between the steel sheet and zinc becomes non-uniform in the surface of the steel sheet, and irregular flow of zinc occurs, so that it is extremely difficult to obtain a uniform plating appearance. Even if the galvanized steel sheet with such uneven appearance is alloyed,
The uneven appearance remains as it is, and a high quality alloyed hot-dip coated steel sheet cannot be obtained. Also, the reheating conditions for obtaining an alloyed hot-dip galvanized steel sheet are different from those of the conventional hot-dip galvanizing method. Galvanized steel sheets cannot be obtained.
【0006】本発明は、従来のガスワイピング法やスプ
レーメッキ方法による合金化溶融亜鉛メッキ製造方法と
は異なる方法により均一で高品位な合金化溶融亜鉛メッ
キ鋼板を高い生産性で製造する方法を提供する事を目的
とする。The present invention provides a method for producing a uniform and high-quality galvannealed steel sheet with high productivity by a method different from the conventional method for producing galvannealed steel by the gas wiping method or the spray plating method. The purpose is to do.
【0007】[0007]
【課題を解決するための手段】本発明は、上記のような
従来法の欠点を有利に排除しうる合金化溶融亜鉛メッキ
鋼板の製造方法であり、その要旨とするところは、 (1)亜鉛微粒子を吹き付けることによりメッキするス
プレーメッキ方法において、メッキする鋼板の表面に、
前処理として付着量0.2 g/m2 ・片面以上2.0 g/m
2 ・片面以下のNiプレメッキを施し、非酸化性雰囲気
下でAlを0.08wt%超0.50wt%以下含む亜鉛微
粒子を、メッキ金属の融点未満の帯状鋼板に吹き付けメ
ッキし、メッキ後帯状鋼板をメッキ金属の融点以上に再
加熱する事を特徴する合金化溶融亜鉛メッキ鋼板の製造
方法。SUMMARY OF THE INVENTION The present invention is a method for producing an alloyed hot-dip galvanized steel sheet which can advantageously eliminate the above-mentioned drawbacks of the conventional method. In the spray plating method of plating by spraying fine particles, on the surface of the steel plate to be plated,
Adhesion amount 0.2 g / m 2 as pre-treatment 2.0 g / m on one side or more
2. Apply Ni pre-plating on one side or less, spray and plate zinc fine particles containing more than 0.08 wt% and less than 0.50 wt% of Al on a strip steel plate having a melting point less than the melting point of the plating metal in a non-oxidizing atmosphere, and after plating, A method of manufacturing an alloyed hot-dip galvanized steel sheet, wherein the steel sheet is reheated to a temperature equal to or higher than the melting point of the plated metal.
【0008】(2)メッキ付着量が100 g/m2 ・片面
以下、かつ再加熱条件が次式に示される鋼板温度と加熱
時間の条件範囲内であることを特徴とする上記(1)記
載の合金化溶融亜鉛メッキ鋼板の製造方法にある。 −1.2(t+Δt)+510≦T≦−0.63(t+
Δt)+580 Δt=0.011 exp(15+WAl) ただし、T:鋼板温度(℃)、t:再加熱時間(s)、
WAl:亜鉛中Al濃度(wt%)(2) The above (1), wherein the coating weight is 100 g / m 2 · one side or less, and the reheating condition is within the range of the steel sheet temperature and the heating time shown in the following formula. In the method for producing an alloyed hot-dip galvanized steel sheet. −1.2 (t + Δt) + 510 ≦ T ≦ −0.63 (t +
Δt) +580 Δt = 0.111 exp (15 + W Al ), where T: steel sheet temperature (° C.), t: reheating time (s),
W Al : Al concentration in zinc (wt%)
【0009】[0009]
【作用】以下に本発明について詳細に説明する。本発明
において、Niプレメッキ量を0.2 g/m2 ・片面以上
としているのは、Niプレメッキ量0.2 g/m2 ・片面
未満では、亜鉛と濡れ性の悪い酸化物が鋼板表面に生成
しているため、スプレーされた亜鉛が鋼板表面に付着し
ないためである。Niプレメッキを実施することによ
り、亜鉛と鋼板の濡れ性を改善する事が可能であるが、
Niは高価な金属であるため、プレメッキ量0.2 g/m
2 ・片面より多くすることは経済的でない。The present invention will be described below in detail. In the present invention, the the Ni Puremekki amount is set to 0.2 g / m 2 · simplex or more, is less than Ni Puremekki amount 0.2 g / m 2 · one side, the zinc and low wettability oxide steel sheet surface This is because the sprayed zinc does not adhere to the surface of the steel sheet because it is generated. By performing Ni pre-plating, it is possible to improve the wettability of zinc and steel sheet,
Since Ni is an expensive metal, the pre-plating amount is 0.2 g / m
2. It is not economical to do more than one side.
【0010】帯状鋼板にスプレーメッキ方法で亜鉛メッ
キを実施する場合、鋼板温度が亜鉛融点より高いと、メ
ッキ実施中に亜鉛と鋼板の合金化反応が起こる。そのた
め、鋼板と亜鉛との濡れ性が鋼板表面内で不均一とな
り、亜鉛の不規則な流動が起こるため、均一なメッキ外
観を得る事が極めて困難となる。このような不均一外観
の亜鉛メッキ鋼板を合金化処理しても、外観不均一はそ
のまま残存する事となり、均一な合金化溶融亜鉛メッキ
鋼板は得られない。均一な合金化溶融亜鉛メッキ鋼板を
スプレーメッキで製造するための条件として、第一にメ
ッキ時の帯状鋼板温度を亜鉛の融点以下とすること、第
二にスプレーメッキ後に再加熱を実施する事が必要であ
る。[0010] When galvanizing a strip-shaped steel sheet by the spray plating method, if the temperature of the steel sheet is higher than the melting point of zinc, an alloying reaction between zinc and the steel sheet occurs during the plating. Therefore, the wettability between the steel sheet and zinc becomes uneven in the surface of the steel sheet, and irregular flow of zinc occurs, so that it is extremely difficult to obtain a uniform plating appearance. Even if the galvanized steel sheet having such a non-uniform appearance is alloyed, the non-uniform appearance remains as it is, and a uniform alloyed hot-dip galvanized steel sheet cannot be obtained. The conditions for producing a uniform alloyed hot-dip galvanized steel sheet by spray plating are as follows: first, the temperature of the strip-shaped steel sheet during plating must be lower than the melting point of zinc, and second, reheating after spray plating is performed. is necessary.
【0011】第一の条件、すなわちメッキ時の帯状鋼板
温度を亜鉛の融点以下とすることで、スプレーされた亜
鉛は鋼板上でただちに凝固し、鋼板上での流動化や合金
化反応を起こさない。そのため、むらのない均一外観を
有するメッキ鋼板を得る事ができる。本発明では、Al
を0.08wt%超0.50wt%以下を含む溶融亜鉛を非
酸化性雰囲気下でスプレーする事が必要である。これ
は、Al濃度が0.08wt%以下の場合、鋼板温度が亜
鉛融点以下でも溶融亜鉛の含熱により、鋼板との間で合
金化反応が起こるからである。Al濃度が0.5wt%よ
り多いと、溶融亜鉛の表面張力が大きくなり、亜鉛同士
が鋼板表面で凝縮し、メッキ外観にむらを生ずるからで
ある。In the first condition, that is, when the temperature of the strip-shaped steel sheet at the time of plating is equal to or lower than the melting point of zinc, the sprayed zinc immediately solidifies on the steel sheet and does not cause fluidization or alloying reaction on the steel sheet. . Therefore, it is possible to obtain a plated steel sheet having a uniform and uniform appearance. In the present invention, Al
It is necessary to spray molten zinc containing more than 0.08 wt% and not more than 0.50 wt% in a non-oxidizing atmosphere. This is because when the Al concentration is 0.08% by weight or less, even when the temperature of the steel sheet is equal to or lower than the zinc melting point, an alloying reaction occurs between the steel sheet and the steel sheet due to the heat content of the molten zinc. If the Al concentration is more than 0.5% by weight, the surface tension of the molten zinc increases, and zinc is condensed on the surface of the steel sheet, resulting in uneven plating appearance.
【0012】第二の条件については、第一の鋼板温度条
件にてスプレーメッキをした場合、メッキ層内に空隙部
が数多く、表面も微小な凹凸を有し、合金化反応もほと
んど起こっておらず、メッキ層の平滑化及び合金化を起
こさせることが必要であり、そのためには、鋼板温度を
メッキ金属の融点以上に再加熱することを見出したもの
である。本発明では、再加熱条件は、次式で示される鋼
板温度と加熱時間の関係範囲内で行う事が必要である。 −1.2(t+Δt)+510≦T≦−0.63(t+
Δt)+580 Δt=0.011 exp(15+WAl) ただし、T:鋼板温度(℃)、t:再加熱時間(s)、
WAl:亜鉛中Al濃度(wt%)Regarding the second condition, when spray plating is performed under the first steel sheet temperature condition, there are many voids in the plating layer, the surface has minute irregularities, and almost no alloying reaction occurs. Instead, it is necessary to cause the plating layer to be smooth and alloyed, and for that purpose, it has been found that the steel sheet is reheated to a temperature equal to or higher than the melting point of the plated metal. In the present invention, the reheating condition needs to be performed within the relational range between the steel sheet temperature and the heating time represented by the following equation. −1.2 (t + Δt) + 510 ≦ T ≦ −0.63 (t +
Δt) +580 Δt = 0.111 exp (15 + W Al ), where T: steel sheet temperature (° C.), t: reheating time (s),
W Al : Al concentration in zinc (wt%)
【0013】これは、図1に示すように、上式左辺の温
度以上では、メッキ層中のFe濃度が16wt%より多く
なり、JIS G 3302に定められた合金化溶融亜
鉛メッキ鋼板の範囲を越えてしまうからである。上式右
辺の温度以下では、凝固亜鉛の再溶解が不十分となり、
未溶解亜鉛が残留して均一な合金化溶融亜鉛めっき鋼板
を得ることができない。従って、最も望ましい再加熱条
件は上式で示される鋼板温度と加熱時間の関係範囲内で
ある。This is because, as shown in FIG. 1, above the temperature on the left side of the above equation, the Fe concentration in the plating layer becomes more than 16 wt%, and the range of the galvannealed steel sheet specified in JIS G 3302 is reduced. Because it will exceed. Below the temperature on the right side of the above formula, re-dissolution of solidified zinc becomes insufficient,
Undissolved zinc remains, and a uniform alloyed hot-dip galvanized steel sheet cannot be obtained. Therefore, the most desirable reheating condition is within the relational range of the steel sheet temperature and the heating time shown by the above equation.
【0014】亜鉛目付量は、100 g/m2 ・片面に抑え
ることが望ましい。これは、合金化溶融亜鉛メッキ鋼板
は、メッキ鋼板加工時にメッキが粉状に剥離するパウダ
リング剥離が起こる。付着量が100 g/m・片面より多
いとパウダリング剥離量が顕著になり、プレス加工傷が
多発し実用的でないためである。It is desirable that the basis weight of zinc be suppressed to 100 g / m 2 per side. This is because powdered peeling occurs in the alloyed hot-dip galvanized steel sheet when the plated steel sheet is processed. If the amount of adhesion is more than 100 g / m / one side, the amount of powdering peeling becomes remarkable, so that press working flaws occur frequently and are not practical.
【0015】[0015]
(実施例1)Al−K鋼板を表1に示す条件にてメッキ
を行い、メッキ後鋼板の品質を調査した。その結果、従
来のガスワイピングを用いて製造した合金化溶融亜鉛メ
ッキ鋼板は、スプラッシュが多数発生した。一方、本発
明法によれば、均一な外観の合金化溶融亜鉛メッキ鋼板
が得られた。(Example 1) An Al-K steel sheet was plated under the conditions shown in Table 1, and the quality of the steel sheet after plating was examined. As a result, a large number of splashes were generated in the galvannealed steel sheet manufactured using the conventional gas wiping. On the other hand, according to the method of the present invention, a galvannealed steel sheet having a uniform appearance was obtained.
【0016】[0016]
【表1】 [Table 1]
【0017】(実施例2)IF鋼板を表2に示す条件に
てメッキを行い、メッキ後鋼板の品質を調査した。その
結果、従来のガスワイピングを用いて製造した合金化溶
融亜鉛メッキ鋼板は、過合金となった。一方、本発明法
によれば、均一で良好な合金化溶融亜鉛メッキ鋼板が得
られた。Example 2 An IF steel sheet was plated under the conditions shown in Table 2, and the quality of the plated steel sheet was examined. As a result, the alloyed hot-dip galvanized steel sheet manufactured using conventional gas wiping became overalloyed. On the other hand, according to the method of the present invention, a uniform and good alloyed hot-dip galvanized steel sheet was obtained.
【0018】[0018]
【表2】 [Table 2]
【0019】[0019]
【発明の効果】本発明によれば、スプレーメッキ方法に
よって、均一で高品位な合金化溶融亜鉛メッキ鋼板を高
い生産性で製造する事が可能である。According to the present invention, a uniform and high-quality alloyed hot-dip galvanized steel sheet can be manufactured with high productivity by the spray plating method.
【図1】付着量0.2 g/m2 ・片面以上2.0 g/m2 ・
片面以下のNiプレメッキが施された帯状鋼板に、非酸
化性雰囲気下でAlを0.08wt%超0.50wt%以下
含むZn微粒子をメッキ時帯状鋼板温度を亜鉛融点未満
で100 g/m2 ・片面以下スプレーメッキした後、再加
熱する際の再加熱条件と合金溶融メッキ鋼板品質の関係
を示す説明図である。[1] coating weight 0.2 g / m 2 · sided or 2.0 g / m 2 ·
The steel strip to one side following Ni Puremekki is applied, a Zn microparticles containing Al or less 0.08 wt% ultra 0.50 wt% in a non-oxidizing atmosphere plated at the steel strip temperature below the zinc melting point 100 g / m 2 -It is explanatory drawing which shows the relationship between the reheating conditions at the time of reheating after spray plating on one side or less, and the quality of a hot-dip-alloyed steel sheet.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) C23C 4/02 - 4/14 C23C 28/02 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) C23C 4/02-4/14 C23C 28/02
Claims (2)
キするスプレーメッキ方法において、メッキする鋼板の
表面に、前処理として付着量0.2 g/m2 ・片面以上
2.0 g/m2 ・片面以下のNiプレメッキを施し、非酸
化性雰囲気下でAlを0.08wt%超0.50wt%以下
含む亜鉛微粒子を、メッキ金属の融点未満の帯状鋼板に
吹き付けメッキし、メッキ後帯状鋼板をメッキ金属の融
点以上に再加熱する事を特徴とする合金化溶融亜鉛メッ
キ鋼板の製造方法。1. A spray plating process for plating by blowing fine particles of zinc, the surface of the steel sheet to be plated, coating weight 0.2 g / m 2 · sided or 2.0 g / m 2 · sided below as preprocessing Ni pre-plating is applied, and in a non-oxidizing atmosphere, zinc fine particles containing more than 0.08 wt% and not more than 0.50 wt% are sprayed and plated on a strip steel sheet having a melting point lower than the melting point of the plating metal. A method for producing an alloyed hot-dip galvanized steel sheet, comprising reheating to a temperature higher than the melting point.
下、かつ再加熱条件が次式に示される鋼板温度と加熱時
間の条件範囲内であることを特徴とする請求項1記載の
合金化溶融亜鉛メッキ鋼板の製造方法。 −1.2(t+Δt)+510≦T≦−0.63(t+
Δt)+580 Δt=0.011 exp(15+WAl) ただし、T:鋼板温度(℃)、t:再加熱時間(s)、
WAl:亜鉛中Al濃度(wt%)2. The alloy according to claim 1, wherein the coating weight is 100 g / m 2 or less on one side, and the reheating condition is within the range of the steel sheet temperature and the heating time shown in the following formula. Manufacturing method of galvannealed steel sheet. −1.2 (t + Δt) + 510 ≦ T ≦ −0.63 (t +
Δt) +580 Δt = 0.111 exp (15 + W Al ), where T: steel sheet temperature (° C.), t: reheating time (s),
W Al : Al concentration in zinc (wt%)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5289556A JP3068392B2 (en) | 1993-11-18 | 1993-11-18 | Manufacturing method of galvannealed steel sheet |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5289556A JP3068392B2 (en) | 1993-11-18 | 1993-11-18 | Manufacturing method of galvannealed steel sheet |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07138730A JPH07138730A (en) | 1995-05-30 |
JP3068392B2 true JP3068392B2 (en) | 2000-07-24 |
Family
ID=17744770
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP5289556A Expired - Fee Related JP3068392B2 (en) | 1993-11-18 | 1993-11-18 | Manufacturing method of galvannealed steel sheet |
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Country | Link |
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JP (1) | JP3068392B2 (en) |
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1993
- 1993-11-18 JP JP5289556A patent/JP3068392B2/en not_active Expired - Fee Related
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Publication number | Publication date |
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JPH07138730A (en) | 1995-05-30 |
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