JPH0128114B2 - - Google Patents
Info
- Publication number
- JPH0128114B2 JPH0128114B2 JP4795585A JP4795585A JPH0128114B2 JP H0128114 B2 JPH0128114 B2 JP H0128114B2 JP 4795585 A JP4795585 A JP 4795585A JP 4795585 A JP4795585 A JP 4795585A JP H0128114 B2 JPH0128114 B2 JP H0128114B2
- Authority
- JP
- Japan
- Prior art keywords
- zone
- heating
- steel sheet
- present
- heating zone
- 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
Links
- 238000010438 heat treatment Methods 0.000 claims description 46
- 230000006698 induction Effects 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 13
- 239000008397 galvanized steel Substances 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000005246 galvanizing Methods 0.000 claims description 3
- 238000005275 alloying Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000007747 plating Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Landscapes
- Coating With Molten Metal (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、合金化亜鉛めつき鋼板の製造方法、
特に、溶融亜鉛めつき後に加熱を誘導加熱により
行う合金化亜鉛めつき鋼板の製造方法に関する。
（従来の技術）
溶融亜鉛めつき鋼板をめつき後、再加熱しめつ
き層のFe−Zn合金化処理を行ういわゆる合金化
亜鉛めつき鋼板の製造方法において、誘導加熱方
式により加熱を行うプロセスは古くから知られて
いる（特公昭37−3107号参照）。しかしながら、
そのような従来の装置を用いた場合、鋼板の長手
方向に対して直角方向に配置された加熱コイルを
用いて誘導加熱を行つているため鋼板の長手方向
に沿つて縦縞模様があらわれるという欠点があつ
た。特公昭52−48342号は、かかる欠点に対して
加熱コイルを斜めに配置することにより縞模様を
消失せしめ得ることを開示している。しかし、か
かる方法はスペースの増大、コイル形状の複雑化
をもたらし適切でない。
（発明が解決しようとする問題点）
ここに、本発明の目的は、従来の誘導加熱方式
にみられた縦縞模様の発生を防止する簡便な手段
を採用した合金化亜鉛めつき鋼板の製造方法を提
供することである。
また本発明の別の目的は、誘導加熱方式を採用
しながら従来の直火式のものよりはもちろん、従
来の誘導加熱方式のものよりもすぐれた合金化亜
鉛めつき鋼板を効率的に製造する方法を提供する
ことである。
（問題点を解決するための手段）
すなわち、本発明者らは、その機構は未だ十分
に解明されていないが、高周波誘導加熱によれば
投入周波数を変えることによつて前述のめつき面
縦縞模様の発生を防止できることを知つたのであ
つた。
かくして、本発明の要旨とするところは、鋼板
を溶融亜鉛めつき浴に浸漬後、引き上げてから加
熱する合金化亜鉛めつき鋼板の製造方法におい
て、めつき鋼板の加熱帯域を少なくとも２以上に
区画し、各区画での加熱を誘導加熱とするととも
にその誘導加熱コイルへの投入周波数を少なくと
も２種使用することを特徴とする、合金化亜鉛め
つき鋼板の製造方法である。
すなわち、本発明の１つの特徴によれば加熱帯
を誘導加熱によるものとするとともに、その加熱
帯を２以上に区画し、それぞれに異なつた周波数
の高周波を投入するのである。少なくとも隣合う
区画部分には異なつた周波数の高周波を投入する
趣旨である。換言すれば、２つの異なつた周波数
の高周波を利用する誘導加熱法である。
なお、周波数を異ならせるというが、本発明の
場合、縦縞模様を消失させるという目的にとつて
は、その差が少なくとも0.2KHz以上あることが
望ましく、より具体的には、最初の段階で2.8K
Hz、次いで3.0KHzとするのが、望ましい。その
場合、少なくとも隣合う区画の周波数が異なれば
十分である。
なお、合金化処理のための加熱温度、加熱時
間、そして保持、冷却時間等は本発明にあつて特
に制限されず、慣用の方法に従えば十分であり、
その場合に本発明の効果は何ら損なわれない。
かくして、本発明によれば、従来高周波誘導加
熱を利用した場合にみられた縦縞模様は完全に消
失してしまい、表面性状のすぐれた合金化亜鉛め
つき鋼板が効率的に製造される。
（作用）
次に図面に関連させてさらに本発明を説明す
る。
第１図は、本発明の方法を実施するための合金
化処理装置１０の略式断面図である。第２図は、
加熱帯の詳細図である。
図中、鋼板１１はめつき浴１２に浸漬後、シン
クロール１３を経て引き上げ、イワイピングノズ
ル１４によるガスワイピング処理を経てめつき目
付量を調節してから上記装置内に送られる。この
装置は、図示例では加熱帯１５、保持帯１６、お
よび冷却帯１７から構成され、めつき鋼板は順次
これらの処理帯域を通過してゆく。加熱帯１５は
図示例にあつては通過鋼板を取り囲むソレノイド
（図示せず）から構成される。
第２図に示すように、上記加熱帯１５は、第１
ゾーン加熱帯２０、第２ゾーン加熱帯２１、さら
に第３ゾーン加熱帯２２に区画される。なお、第
２ゾーン加熱帯と第３ゾーン加熱帯との間には保
持帯を設けてもよい。すでに第２ゾーン加熱帯で
合金化が開始しているからである。
なお、高周波誘導加熱および投入周波数の変更
装置、機構それら自体は周知であるため、それら
の内容についてはこれ以上の言及は説明を簡便に
するため省略するが、50Hzまたは60Hzの三相交流
を一度直流に変換して、次いで周波数変換を行う
サイリスタインバータ方式によれば容易に所望の
周波数が得られ、これを２系統利用することによ
り異なる２種の周波数を加熱帯１５に投入でき
る。
めつき処理鋼板の表面酸化を防止するために装
置内は非酸化性雰囲気とするのが好ましい。
なお、各処理帯域および区画は仕切り板１８に
よつて仕切られており、鋼板通過に伴う雰囲気ガ
スのドラフトを可及的に防止するようにしてい
る。
次に実施例によつて本発明をさらに説明する。
実施例 １
第１図および第２図に示す装置を使い鋼板の溶
融亜鉛めつきを行つた。ただし、加熱帯は第１ゾ
ーン加熱帯および第２ゾーン加熱帯の２区分に区
画した。亜鉛目付量は片面で50ｇ／m2であつた。
本例では第１加熱帯の投入周波数は3KHz、第２
加熱帯での投入周波数は３〜5KHzであつた。
結果を次表にまとめて示す。
同表に示す結果からも明らかなように、本発明
によれば従来のような縞模様は全く表われていな
い。このようなすぐれた効果が単に周波数を異な
らせるという簡単な手段で達成できるということ
から、本発明の効果には大きいものがあるといえ
る。
また、本発明における如く、２種以上の周波数
を利用するということから、２系統以上の電源を
持つことになり、かかる場合の利点としてさら
に、板厚等の操業条件変化に対し、１系統のみを
条件変更し他方を定格操業させることにより全体
としてコイル効率を大きく低下させることなしに
操業できるという予想外のすぐれた効果もある。
【表】DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides a method for manufacturing an alloyed galvanized steel sheet,
In particular, the present invention relates to a method for producing an alloyed galvanized steel sheet in which heating is performed by induction heating after hot-dip galvanizing. (Prior art) In the manufacturing method of so-called alloyed galvanized steel sheets, in which the hot-dip galvanized steel sheets are plated and then reheated to form a Fe-Zn alloying treatment for the fastening layer, the heating process is performed using an induction heating method. It has been known for a long time (see Special Publication No. 37-3107). however,
When using such conventional equipment, induction heating is performed using a heating coil arranged perpendicular to the longitudinal direction of the steel plate, so a disadvantage is that a vertical striped pattern appears along the longitudinal direction of the steel plate. It was hot. Japanese Patent Publication No. 52-48342 discloses that the striped pattern can be eliminated by arranging the heating coil diagonally in order to solve this problem. However, such a method is not suitable because it increases the space and complicates the coil shape. (Problems to be Solved by the Invention) An object of the present invention is to provide a method for producing an alloyed galvanized steel sheet that employs a simple means for preventing the occurrence of vertical stripes that are observed in conventional induction heating methods. The goal is to provide the following. Another object of the present invention is to efficiently produce alloyed galvanized steel sheets that are superior to those using the conventional direct-fired method as well as those using the conventional induction heating method, while employing an induction heating method. The purpose is to provide a method. (Means for solving the problem) In other words, the present inventors have discovered that, although the mechanism is not yet fully elucidated, high-frequency induction heating can reduce the aforementioned vertical stripes on the plating surface by changing the application frequency. I learned that it is possible to prevent the formation of patterns. Thus, the gist of the present invention is to provide a method for manufacturing an alloyed galvanized steel sheet in which a steel sheet is immersed in a hot-dip galvanizing bath, then pulled up and then heated, the heating zone of the galvanized steel sheet being divided into at least two or more regions. The method for producing an alloyed galvanized steel sheet is characterized in that heating in each section is performed by induction heating, and at least two frequencies are applied to the induction heating coil. That is, according to one feature of the present invention, the heating zone is heated by induction heating, and the heating zone is divided into two or more, and high-frequency waves of different frequencies are applied to each zone. The purpose is to inject high frequencies of different frequencies into at least adjacent sections. In other words, it is an induction heating method that uses high frequencies of two different frequencies. Although it is said that the frequencies are different, in the case of the present invention, for the purpose of eliminating the vertical striped pattern, it is desirable that the difference is at least 0.2 KHz.
Hz, then 3.0KHz is desirable. In that case, it is sufficient that at least the frequencies of adjacent sections are different. Note that the heating temperature, heating time, holding time, cooling time, etc. for alloying treatment are not particularly limited in the present invention, and it is sufficient to follow a conventional method.
In that case, the effects of the present invention are not impaired in any way. Thus, according to the present invention, the vertical striped pattern that was conventionally observed when high-frequency induction heating was used completely disappears, and an alloyed galvanized steel sheet with excellent surface properties can be efficiently produced. (Operation) Next, the present invention will be further explained in relation to the drawings. FIG. 1 is a schematic cross-sectional view of an alloying treatment apparatus 10 for carrying out the method of the present invention. Figure 2 shows
It is a detailed view of a heating zone. In the figure, a steel plate 11 is immersed in a plating bath 12, then pulled up through a sink roll 13, and subjected to a gas wiping process using an wiping nozzle 14 to adjust the plating weight before being sent into the above-mentioned apparatus. In the illustrated example, this apparatus is composed of a heating zone 15, a holding zone 16, and a cooling zone 17, and the plated steel sheet passes through these treatment zones in sequence. In the illustrated example, the heating zone 15 is comprised of a solenoid (not shown) surrounding the passing steel plate. As shown in FIG. 2, the heating zone 15 has a first
It is divided into a zone heating zone 20, a second zone heating zone 21, and a third zone heating zone 22. Note that a holding zone may be provided between the second zone heating zone and the third zone heating zone. This is because alloying has already started in the second heating zone. The devices and mechanisms for high-frequency induction heating and input frequency change are well known, so we will not discuss them any further for the sake of brevity. A desired frequency can be easily obtained using a thyristor inverter system in which DC is converted and then frequency is converted, and by using two systems, two different frequencies can be input to the heating zone 15. In order to prevent surface oxidation of the plated steel sheet, it is preferable that a non-oxidizing atmosphere be maintained within the apparatus. Note that each processing zone and section is partitioned by a partition plate 18 to prevent as much as possible draft of atmospheric gas due to passage of the steel plate. Next, the present invention will be further explained with reference to Examples. Example 1 A steel plate was hot-dip galvanized using the apparatus shown in FIGS. 1 and 2. However, the heating zone was divided into two sections: a first zone heating zone and a second zone heating zone. The zinc coating amount on one side was 50 g/m 2 .
In this example, the input frequency of the first heating zone is 3KHz, and the input frequency of the second heating zone is 3KHz.
The input frequency in the heating zone was 3 to 5 KHz. The results are summarized in the table below. As is clear from the results shown in the same table, according to the present invention, the striped pattern unlike the conventional one does not appear at all. Since such excellent effects can be achieved by simply changing the frequencies, it can be said that the present invention has great effects. In addition, as in the present invention, since two or more types of frequencies are used, two or more power supply systems are required, and as an advantage in such a case, only one system can handle changes in operating conditions such as plate thickness. There is also the unexpectedly excellent effect that by changing the conditions of one and operating the other at its rated value, it is possible to operate without significantly reducing the overall coil efficiency. 【table】
第１図は、本発明の方法を実施するための合金
化処理装置の略式断面図；および第２図は、第１
図の合金化処理装置の加熱帯の詳細図である。
１０：合金化処理装置、１１：鋼板、１２：め
つき浴、１３：シンクロール、１４：ワイピング
ノズル、１５：加熱帯、１６：保持帯、１７：冷
却帯。
FIG. 1 is a schematic sectional view of an alloying treatment apparatus for carrying out the method of the present invention; and FIG.
FIG. 3 is a detailed view of the heating zone of the alloying treatment apparatus shown in the figure. 10: alloying treatment device, 11: steel plate, 12: plating bath, 13: sink roll, 14: wiping nozzle, 15: heating zone, 16: holding zone, 17: cooling zone.
Claims (1)
てから加熱する合金化亜鉛めつき鋼板の製造方法
において、めつき鋼板の加熱帯域を少なくとも２
以上に区画し、各区画での加熱を誘導加熱とする
とともにその誘導加熱コイルへの投入周波数を少
なくとも２種使用することを特徴とする、合金化
亜鉛めつき鋼板の製造方法。1. In a method for manufacturing an alloyed galvanized steel sheet in which a steel sheet is immersed in a hot-dip galvanizing bath, then pulled up and then heated, the heating zone of the galvanized steel sheet is set to at least 2.
A method for manufacturing an alloyed galvanized steel sheet, which is divided into the above sections, and the heating in each section is performed by induction heating, and at least two types of input frequencies are used for the induction heating coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4795585A JPS61207561A (en) | 1985-03-11 | 1985-03-11 | Production of alloyed hot dip galvanized steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4795585A JPS61207561A (en) | 1985-03-11 | 1985-03-11 | Production of alloyed hot dip galvanized steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61207561A JPS61207561A (en) | 1986-09-13 |
| JPH0128114B2 true JPH0128114B2 (en) | 1989-06-01 |
Family
ID=12789772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4795585A Granted JPS61207561A (en) | 1985-03-11 | 1985-03-11 | Production of alloyed hot dip galvanized steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61207561A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4807559A (en) * | 1987-09-02 | 1989-02-28 | Ajax Magnethermic Corporation | Apparatus for alloying of coatings |
| JP2776150B2 (en) * | 1992-05-26 | 1998-07-16 | 日本鋼管株式会社 | Method for producing two-layer alloyed hot-dip galvanized steel sheet with excellent ED resistance |
| JP4081461B2 (en) * | 2004-08-02 | 2008-04-23 | 新日本製鐵株式会社 | Steel material with excellent fatigue characteristics and method for producing the same |
| JP7134591B2 (en) * | 2016-09-23 | 2022-09-12 | 日本製鉄株式会社 | Continuous hot-dip galvanizing method and continuous hot-dip galvanizing equipment |
-
1985
- 1985-03-11 JP JP4795585A patent/JPS61207561A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61207561A (en) | 1986-09-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |