JPH03100154A - Production of alloying hot dip galvanized steel strip - Google Patents
Production of alloying hot dip galvanized steel stripInfo
- Publication number
- JPH03100154A JPH03100154A JP23829889A JP23829889A JPH03100154A JP H03100154 A JPH03100154 A JP H03100154A JP 23829889 A JP23829889 A JP 23829889A JP 23829889 A JP23829889 A JP 23829889A JP H03100154 A JPH03100154 A JP H03100154A
- Authority
- JP
- Japan
- Prior art keywords
- alloying
- steel strip
- temperature
- degree
- immersed
- 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
- 238000005275 alloying Methods 0.000 title claims abstract description 141
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 38
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 85
- 239000010959 steel Substances 0.000 claims abstract description 85
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000011701 zinc Substances 0.000 claims abstract description 66
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 66
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000007747 plating Methods 0.000 claims abstract description 12
- 238000000137 annealing Methods 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 29
- 238000010438 heat treatment Methods 0.000 abstract description 12
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 3
- 238000003303 reheating Methods 0.000 description 26
- 238000005246 galvanizing Methods 0.000 description 11
- 239000007789 gas Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 229910001297 Zn alloy Inorganic materials 0.000 description 2
- 239000000112 cooling gas Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011449 brick Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 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、合金化溶融亜鉛めっき鋼帯の製造方法に関す
る。 詳しくは、合金化処理温度の変化等に応じて亜鉛
浴に浸漬する鋼帯の温度を調整することにより、常に一
定の合金化度の合金化溶融亜鉛めっき鋼帯を得られる合
金化溶融亜鉛めっき鋼帯の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for producing an alloyed hot-dip galvanized steel strip. In detail, alloyed hot-dip galvanized steel strip can always be obtained with a constant degree of alloying by adjusting the temperature of the steel strip immersed in a zinc bath according to changes in the alloying treatment temperature. This invention relates to a method for producing steel strips.
〈従来の技術〉
溶融亜鉛めっき鋼帯の塗装性、塗ｌｌＫ密着性、溶接性
等を向上させるために、再度加熱処理を施し、亜鉛めっ
き層をＦｅ−Ｚｎ合金化させる合金化溶融亜鉛めっき鋼
帯が公知である。<Conventional technology> In order to improve the paintability, coating adhesion, weldability, etc. of hot-dip galvanized steel strip, alloyed hot-dip galvanized steel is heat-treated again and the galvanized layer is turned into an Fe-Zn alloy. Obi is known.
このような合金化溶融亜鉛めっき鋼帯の製造方法の一例
を第１図を参照して説明すると、まず鋼帯Ａを焼鈍炉１
２を通過させることにより所定の温度に加熱する。 こ
の焼鈍炉１２は、加熱帯１８とその後方（以下、後方と
は鋼帯Ａ移動方向の下流側とする）に配置される冷却帯
２０とから構成され、鋼帯Ａはまず加熱帯１８において
約８００℃に加熱された後、冷却帯２０において約４７
０℃まで冷却される。An example of a method for producing such an alloyed hot-dip galvanized steel strip will be explained with reference to FIG.
2 to heat it to a predetermined temperature. This annealing furnace 12 is composed of a heating zone 18 and a cooling zone 20 disposed behind the heating zone 18 (hereinafter, the rear means the downstream side in the moving direction of the steel strip A). After being heated to about 800°C, the cooling zone 20 cools down to about 47°C.
Cooled down to 0°C.
焼鈍炉１２において所定の温度に加熱・冷却された鋼帯
Ａは、次いで、約４６０℃の亜鉛浴１４に浸漬され、そ
の表面に溶融亜鉛が付着される。The steel strip A, which has been heated and cooled to a predetermined temperature in the annealing furnace 12, is then immersed in a zinc bath 14 at about 460° C., and molten zinc is deposited on its surface.
溶融亜鉛を付着された鋼帯Ａは、亜鉛浴１４から略鉛直
方向に引きあげられて、絞りノズル２２によって亜鉛付
着量の制御が行なわれ、その後方（上方）に設けられた
合金化炉１６において約５００℃に再加熱されて合金化
処理を施され、次工程に送られる。The steel strip A coated with molten zinc is pulled up from the zinc bath 14 in a substantially vertical direction, the amount of zinc deposited is controlled by a throttle nozzle 22, and then passed through an alloying furnace 16 provided behind (above) the steel strip A. It is reheated to about 500°C, subjected to alloying treatment, and sent to the next process.
この合金化処理とは、前述のように亜鉛めっき鋼帯の塗
装性等を向上させるために、鋼帯Ａの鉄を亜鉛めっき層
中に拡散させることにより、Ｆｅ−Ｚｎ合金層を形成せ
しめるものである。 なお、このような合金化は、鋼帯
Ａが亜鉛浴１４に浸漬された瞬間より開始され、合金化
炉１６において再加熱することにより完了する。As mentioned above, this alloying treatment is a process in which the iron of steel strip A is diffused into the galvanized layer to form an Fe-Zn alloy layer in order to improve the paintability of the galvanized steel strip. It is. Incidentally, such alloying is started from the moment the steel strip A is immersed in the zinc bath 14, and is completed by reheating in the alloying furnace 16.
ここで、この合金化における合金の進行の程度、すなわ
ち合金化度は亜鉛めっき層中に含まれる鉄の濃度で定量
的に評価することができる。 そのため、通常の合金化
溶融亜鉛めっき装置においては、例えば合金化炉１６の
出口に合金化度の測定装置（合金化度計２４）を配置し
て、合金化処理が終了した鋼帯の合金化度を測定して、
その測定値を用いて製品の合否判定を行なったり、ある
いは合金化炉１６における再加熱温度の調整等を行なっ
ている。Here, the degree of progress of the alloy in this alloying, that is, the degree of alloying, can be quantitatively evaluated by the concentration of iron contained in the galvanized layer. Therefore, in a normal alloying hot-dip galvanizing apparatus, for example, an alloying degree measuring device (alloying degree meter 24) is placed at the outlet of the alloying furnace 16, and the steel strip that has undergone alloying treatment is Measure the degree,
The measured values are used to judge whether the product is acceptable or to adjust the reheating temperature in the alloying furnace 16.
例えば、特開昭６２−１２３９３５号公報には、Ｘ線回
折を適用する合金化度計を用いて亜鉛めっき層の合金化
度を測定し、その結果を合金化炉１６における再加熱温
度および／または鋼帯Ａの在炉時間にフィードバックす
る方法が開示されている。 すなわち、この方法は、亜
鉛めっき層の合金化度を測定することにより、被処理鋼
帯の板厚や板巾が変化しても、合金化炉１６における再
加熱温度が一定になるように合金化炉１６における燃焼
量を調整したり、あるいは溶融亜鉛の付着量が変化した
場合に、再加熱温度を調整することにより、常に一定の
合金化度を有する合金化溶融亜鉛めっき鋼板を得ること
を可能としたものである。For example, in JP-A-62-123935, the degree of alloying of a galvanized layer is measured using an alloying degree meter that applies X-ray diffraction, and the results are used to determine the reheating temperature and/or temperature in the alloying furnace 16. Alternatively, a method of feeding back to the furnace time of the steel strip A is disclosed. In other words, this method measures the degree of alloying of the galvanized layer so that the reheating temperature in the alloying furnace 16 remains constant even if the thickness and width of the steel strip to be treated change. It is possible to obtain an alloyed hot-dip galvanized steel sheet that always has a constant degree of alloying by adjusting the amount of combustion in the chemical furnace 16 or by adjusting the reheating temperature when the amount of deposited zinc changes. This made it possible.
〈発明が解決しようとする課題〉
ところが、前述の特開昭６２−１２３９３５号公報等に
開示される方法のように、合金化炉１６での加熱温度を
調整することにより亜鉛めっき層の合金化度を所定の目
標値にする方法においては、種々の問題点がある。<Problems to be Solved by the Invention> However, as in the method disclosed in the above-mentioned Japanese Unexamined Patent Publication No. 62-123935, etc., alloying of the galvanized layer is achieved by adjusting the heating temperature in the alloying furnace 16. There are various problems in the method of setting the degree to a predetermined target value.
つまり、合金化炉１６は一般的に熱容量の大きい耐火断
熱レンガの壁で構成されており、鋼ｆ、Ａの加熱はこの
壁からの輻射伝熱が主体となっている。 従って、合金
化炉１６における再加熱温度を調節するためには、熱容
量の大きい壁の温度を変化させる必要があるため、温度
の調節に非常に時間がかかつてしまう。That is, the alloying furnace 16 is generally constructed of walls of fireproof and insulating bricks with a large heat capacity, and the heating of the steels f and A is mainly performed by radiation heat transfer from these walls. Therefore, in order to adjust the reheating temperature in the alloying furnace 16, it is necessary to change the temperature of the wall having a large heat capacity, so it takes a very long time to adjust the temperature.
そのため、その間（温度調整中）に合金化炉１６を通過
した鋼帯Ａは合金化不足や合金化過剰等の製品品質不良
が生じてしまい、良好な合金化溶融亜鉛めっき鋼帯を得
ることができない。Therefore, the steel strip A that passed through the alloying furnace 16 during that period (during temperature adjustment) suffers from product quality defects such as insufficient alloying and overalloying, making it impossible to obtain a good alloyed hot-dip galvanized steel strip. Can not.
また、合金化炉１６における再加熱条件を大きく変化さ
せる際には、前述の不都合を回避するために通板材と称
するダミー鋼帯を通過させる必要があるので、生産性が
大きく阻害される。Furthermore, when the reheating conditions in the alloying furnace 16 are changed significantly, it is necessary to pass a dummy steel strip called a threading material in order to avoid the above-mentioned disadvantages, which greatly impedes productivity.
鋼’ＩＪＡの在炉時間を調整することにより合金化度を
所定の目標値にする方法もあるが、この方法では当然鋼
帯９動のラインスピードを変化させざるを得す、やはり
生産性を阻害したり、また、鋼帯Ａへの溶融亜鉛の付着
量の制御を阻害する要因となフてしまうため、デメリッ
トが大きい。There is also a method of adjusting the alloying degree to a predetermined target value by adjusting the furnace time of steel IJA, but this method naturally requires changing the line speed of the steel strip 9 motion, which also reduces productivity. This is a major disadvantage because it may become a factor that inhibits control of the amount of molten zinc deposited on the steel strip A.
本発明の目的は、前記従来技術の問題点を解決すること
にあり、鋼帯の板厚や板巾が変化したり、鋼帯への溶融
亜鉛の付着量が変化した際においても、合金化不足や合
金化過剰といった品質不良が発生することがなく、良好
な合金化溶融亜鉛めっき鋼帯を得ることができ、しかも
生産性を阻害することもない合金化溶融亜鉛めっき鋼帯
の製造方法を提供することにある。The purpose of the present invention is to solve the problems of the prior art as described above, and even when the thickness or width of the steel strip changes or the amount of molten zinc deposited on the steel strip changes, the alloying A method for manufacturing alloyed hot-dip galvanized steel strip that does not cause quality defects such as under-alloying or overalloying, can obtain good alloyed hot-dip galvanized steel strip, and does not impede productivity. It is about providing.
く課題を解決するための手段〉
前記目的を達成するために、本発明者らは鋭意検討を重
ね、亜鉛浴に浸漬する際の鋼帯の温度を変化させること
により、合金化炉における亜鉛めっき層の合金化度が変
化することを見出し、従って、亜鉛浴に浸漬する鋼帯の
温度を制御することにより、亜鉛めっき層の合金化度を
制御できることを見出すことにより本発明を完成させた
。Means for Solving the Problems> In order to achieve the above object, the present inventors have made extensive studies and have found that by changing the temperature of the steel strip when immersed in the zinc bath, the galvanizing process in the alloying furnace can be improved. The present invention was completed by discovering that the degree of alloying of the layer changes and therefore that by controlling the temperature of the steel strip immersed in the zinc bath, the degree of alloying of the galvanized layer can be controlled.
すなわち、本発明の第１の態様は、焼鈍炉において所定
の温度に加熱後に所定の温度まで冷却した鋼帯を、亜鉛
浴に浸漬しく次いで亜鉛付着量を制御した後、合金化処
理を行なう合金化溶融亜鉛めっき鋼帯の製造方法におい
て、前記合金化処理後の亜鉛めっきの合金化度を測定し
、その測定結果に応じて、亜鉛めっきの合金化度が所定
の目標値に成るように、前記亜鉛浴に浸漬する前記鋼帯
の温度を調整することを特徴とする合金化溶融亜鉛めっ
き鋼帯の製造方法を提供する。That is, the first aspect of the present invention is to immerse a steel strip that has been heated to a predetermined temperature in an annealing furnace and then cooled to a predetermined temperature in a zinc bath, and then to control the amount of zinc deposited on the alloy. In the method for producing a hot-dip galvanized steel strip, the degree of alloying of the galvanizing after the alloying treatment is measured, and according to the measurement result, the degree of alloying of the galvanizing reaches a predetermined target value, Provided is a method for producing an alloyed hot-dip galvanized steel strip, which comprises adjusting the temperature of the steel strip immersed in the zinc bath.
また、本発明の第２の態様は、焼鈍炉において所定の温
度に加熱後に所定の温度まで冷却した鋼帯を、亜鉛浴に
浸漬し、次いで亜鉛付着量を制御した後、合金化処理を
行なう合金化溶融亜鉛めっき鋼帯の製造方法において、
前記合金化処理における処理温度と前記亜鉛浴に浸漬す
るｍ帯の温度との関係を、亜鉛めっきの合金化度が所定
の目標値になるように予め設定しておき、前記合金化処
理における処理温度の変化に応じて前記亜鉛浴に浸漬す
る鋼帯の温度を、前記関係に基づいて調整することを特
徴とする合金化溶融亜鉛めっき鋼帯の製造方法を提供す
る。Further, in a second aspect of the present invention, a steel strip that has been heated to a predetermined temperature in an annealing furnace and then cooled to a predetermined temperature is immersed in a zinc bath, and then, after controlling the amount of zinc deposited, alloying treatment is performed. In the method for manufacturing an alloyed hot-dip galvanized steel strip, the relationship between the processing temperature in the alloying treatment and the temperature of the m-zone immersed in the zinc bath is controlled such that the degree of alloying of the galvanizing becomes a predetermined target value. An alloyed hot-dip galvanized steel strip characterized in that the temperature of the steel strip immersed in the zinc bath is adjusted based on the relationship set in advance and according to changes in the treatment temperature in the alloying treatment. A manufacturing method is provided.
く作用〉
以下、本発明に係る合金化溶融亜鉛めっき鋼帯の製造方
法について詳細に説明する。Effects> Hereinafter, the method for producing an alloyed hot-dip galvanized steel strip according to the present invention will be described in detail.
第１図に、本発明の合金化溶融亜鉛めっき鋼帯の製造方
法を実施する合金化溶融亜鉛めっき装置の一例の概念図
が示される。FIG. 1 shows a conceptual diagram of an example of an alloying hot-dip galvanizing apparatus for carrying out the method for producing an alloyed hot-dip galvanized steel strip of the present invention.
第１図に示される合金化溶融亜鉛めっき装置１０（以下
、めっき装置１０とする）は、基本的に焼鈍炉１２と、
亜鉛浴１４および合金化炉１６とから構成されるもので
ある。The alloying hot-dip galvanizing apparatus 10 (hereinafter referred to as the plating apparatus 10) shown in FIG. 1 basically includes an annealing furnace 12,
It is composed of a zinc bath 14 and an alloying furnace 16.
焼鈍炉１２は、加熱帯１８と冷却帯２０とから構成され
る。 鋼帯Ａは、まず加熱帯１８において焼きなましも
兼ねて約８００℃に加熱され、次いで冷却帯２０におい
てガスジェット冷却方式で約４７０℃に冷却される。The annealing furnace 12 is composed of a heating zone 18 and a cooling zone 20. The steel strip A is first heated to about 800° C. in the heating zone 18, which also serves as annealing, and then cooled to about 470° C. in the cooling zone 20 by a gas jet cooling method.
次いで、鋼帯Ａはそのまま約４６０℃の亜鉛浴１４に浸
漬され、溶融亜鉛が付着される。Next, the steel strip A is immersed as it is in a zinc bath 14 at about 460° C., and molten zinc is deposited thereon.
亜鉛浴１４において溶融亜鉛が付着された鋼帯Ａは、略
鉛直方向に引きあげられつつ気体絞り用ノズル２２によ
って溶融亜鉛の付着量が制御され、その上方（下流）に
配置された合金化炉１６に送られる。The steel strip A to which molten zinc has been deposited in the zinc bath 14 is pulled up in a substantially vertical direction while the amount of molten zinc deposited is controlled by a gas throttling nozzle 22, and the alloying furnace 16 is placed above (downstream) thereof. sent to.
鋼帯Ａは合金化炉１６において約５００ｔに再加熱され
て、亜鉛めっき層の合金化処理が行なわれ、次工程へ搬
送される。The steel strip A is reheated to about 500 tons in the alloying furnace 16 to undergo alloying treatment for the galvanized layer, and then transported to the next process.
なお、図示例のめっき装置１０においては合金化炉１６
の上方には合金化度計２４が配置され、合金化処理後の
亜鉛めっき層の合金化度が測定される。In addition, in the illustrated example plating apparatus 10, the alloying furnace 16
An alloying degree meter 24 is arranged above the alloying degree meter 24 to measure the alloying degree of the galvanized layer after the alloying treatment.
ここで、本発明の第１の態様においては、第１図中−点
鎖線に示されるように合金化度計２４の合金化度の測定
結果に応じて、また、第２の態様においては、第１図ウ
ニ点鎖線に示されるように合金化炉１６における処理（
再加熱）温度の変化に応じて、冷却帯２０における鋼帯
Ａの冷却温度を調整して、亜鉛浴１４に浸漬する鋼帯Ａ
の温度を調整するものである。Here, in the first aspect of the present invention, according to the measurement result of the degree of alloying by the degree of alloying meter 24, as shown by the dashed line in FIG. 1, and in the second aspect, As shown in the dashed line in FIG. 1, the processing in the alloying furnace 16 (
(reheating) The cooling temperature of the steel strip A in the cooling zone 20 is adjusted according to the temperature change, and the steel strip A is immersed in the zinc bath 14.
This is to adjust the temperature of the
第２図に、本発明の合金化溶融亜鉛めっき鋼帯の製造方
法において、その技術的思想の基本となる、亜鉛浴１４
へ浸漬する鋼帯Ａの温度をパラメータとした合金化炉１
６における処理温度（再加熱温度）と亜鉛めっき層の合
金化度との関係を概念的に示す。FIG. 2 shows a zinc bath 14, which is the basis of the technical idea in the method for manufacturing an alloyed hot-dip galvanized steel strip of the present invention.
Alloying furnace 1 with temperature of steel strip A immersed in as a parameter
6 conceptually shows the relationship between the treatment temperature (reheating temperature) and the degree of alloying of the galvanized layer in No. 6.
なお、第２図においては、横軸は合金化炉１６における
再加熱温度を、縦軸は亜鉛めっき層の合金化度を示すも
のであり、また、バラ−メータとして曲線Ａは亜鉛浴１
４に浸漬する鋼帯の温度が高い場合、曲線Ｂは亜鉛浴１
４に浸漬する鋼帯の温度が低い場合の再加熱温度と合金
化度の関係を示すものである。In Fig. 2, the horizontal axis shows the reheating temperature in the alloying furnace 16, and the vertical axis shows the degree of alloying of the galvanized layer.
If the temperature of the steel strip immersed in zinc bath 1 is high, curve B
Fig. 4 shows the relationship between reheating temperature and degree of alloying when the temperature of the steel strip immersed in Fig. 4 is low.
第２図より明らかなように、合金化炉１６における鋼帯
Ａの在炉時間が同じである場合、再加熱温度が高くなる
と合金化度が増加する。As is clear from FIG. 2, when the steel strip A stays in the alloying furnace 16 for the same amount of time, the degree of alloying increases as the reheating temperature increases.
また、図中にパラメータとして示したように、亜鉛浴１
４に浸漬する鋼帯Ａの温度が高くなると、やはり合金化
度が増加する。 つまり、亜鉛浴１４に浸漬する鋼帯Ａ
の温度を調整することにより、亜鉛めっき層の合金化度
を調整することが可能である。In addition, as shown as parameters in the figure, zinc bath 1
When the temperature of the steel strip A immersed in No. 4 increases, the degree of alloying also increases. In other words, the steel strip A immersed in the zinc bath 14
By adjusting the temperature of the galvanized layer, it is possible to adjust the degree of alloying of the galvanized layer.
鋼帯Ａの通板速度が一定であった場合に、例えばＩＩＩ
ＦＡの板厚が薄いものから厚いものに変化する等によっ
て、合金化炉１６における再加熱温度がＴ１からＴ２に
低下してしまった場合には、合金化炉１６における鋼帯
Ａの温度が曲線Ｂで示される温度であった際には、合金
化度もＦ、からＦ２に低下してしまう。For example, when the threading speed of steel strip A is constant, III
If the reheating temperature in the alloying furnace 16 decreases from T1 to T2 due to changes in the thickness of the FA from thin to thick, etc., the temperature of the steel strip A in the alloying furnace 16 will change according to the curve. When the temperature is B, the degree of alloying also decreases from F to F2.
ここで、従来の方法では、このような合金化炉における
鋼帯の温度変化が生じた際には、合金化炉の温度を調整
することにより、例えば前述のように温度が低下した場
合には合金化炉への燃料投入量を増加する等の方法によ
り、再びＴ、まで再加熱温度を上昇させていた。 しか
し、この方法では所定の温度まで再加熱温度を上昇（降
下）させるのに時間がかかり、その間に合金化不足（合
金化過剰）が生じてしまうのは前述のとおりである。Here, in the conventional method, when such a temperature change of the steel strip in the alloying furnace occurs, by adjusting the temperature of the alloying furnace, for example, when the temperature decreases as described above, The reheating temperature was raised again to T by methods such as increasing the amount of fuel input into the alloying furnace. However, with this method, it takes time to raise (lower) the reheating temperature to a predetermined temperature, and as described above, insufficient alloying (overalloying) occurs during this time.
これに対し、本発明の合金化溶融亜鉛めっき方法におい
ては、亜鉛浴１４に浸漬する前の鋼帯Ａの温度を調整す
ることにより、つまり、合金化炉１６における鋼帯Ａの
再加熱温度がＴ。In contrast, in the alloying hot-dip galvanizing method of the present invention, by adjusting the temperature of the steel strip A before being immersed in the zinc bath 14, that is, the reheating temperature of the steel strip A in the alloying furnace 16 is adjusted. T.
からＴ２に低下した場合には、亜鉛浴１４に浸漬する鋼
帯Ａの温度を曲線Ｂで示される温度から、曲線Ａで示さ
れる温度まで上昇することにより、合金化度をＦ２から
Ｆ、に上昇させ、所定の合金化度の溶融亜鉛めっき鋼帯
を得るものである。When the alloying degree decreases from F2 to T2, the temperature of the steel strip A immersed in the zinc bath 14 is increased from the temperature shown by curve B to the temperature shown by curve A, thereby changing the degree of alloying from F2 to F. to obtain a hot-dip galvanized steel strip with a predetermined degree of alloying.
従って、合金化が過剰である場合には、冷却帯２０にお
ける鋼帯Ａの冷却温度を低くして亜鉛浴１４に浸漬する
鋼板Ａの温度を下げることにより、また、合金化が不足
である場合には、同様にして亜鉛浴１４に浸漬する鋼帯
Ａの温度を上昇することにより、合金化度の過不足を生
じることなく、常に所定の合金化度を有する合金化溶融
亜鉛めっき鋼帯を製造することができる。Therefore, when alloying is excessive, the cooling temperature of steel strip A in cooling zone 20 is lowered to lower the temperature of steel sheet A immersed in zinc bath 14, and when alloying is insufficient, To do this, by raising the temperature of the steel strip A immersed in the zinc bath 14 in the same way, it is possible to produce an alloyed hot-dip galvanized steel strip that always has a predetermined degree of alloying without causing excess or deficiency in the degree of alloying. can be manufactured.
本発明の第１の態様の合金化溶融亜鉛めっき鋼帯の製造
方法においては、合金化度計２４の測定結果に応じて、
また第２の態様においては合金化炉１６における再加熱
温度と亜鉛浴１４に浸漬する鋼帯Ａの温度との関係を亜
鉛めっきの合金化度が所定の目標値になるように予め設
定しておき、合金化炉１６における再加熱温度の変化に
応じて、冷却帯２０における冷却温度を調整して亜鉛浴
１４に浸漬する鋼帯Ａの温度を調整することにより、良
好な応答性で、合金化度の過不足を生じることなく、所
定の合金化度を有する合金化溶融亜鉛めっき鋼帯を製造
することができる。In the method for manufacturing an alloyed hot-dip galvanized steel strip according to the first aspect of the present invention, depending on the measurement results of the alloying degree meter 24,
In the second embodiment, the relationship between the reheating temperature in the alloying furnace 16 and the temperature of the steel strip A immersed in the zinc bath 14 is set in advance so that the degree of alloying of the zinc plating becomes a predetermined target value. By adjusting the temperature of the steel strip A immersed in the zinc bath 14 by adjusting the cooling temperature in the cooling zone 20 in accordance with changes in the reheating temperature in the alloying furnace 16, alloying can be achieved with good responsiveness. It is possible to produce an alloyed hot-dip galvanized steel strip having a predetermined degree of alloying without causing an excess or deficiency in the degree of alloying.
ところで、合金化溶融亜鉛めっきにおいては、鋼帯を亜
鉛浴に浸漬する前の鋼帯の温度調整は、通常、焼なまし
もかねて高温まで加熱した後に所定の温度まで冷却を行
なうものであり、図示例の装置においては、鋼帯Ａは前
述のように焼鈍炉１２において、まず加熱帯１８で約８
００℃に加熱され、次いで冷却帯２０で約４７０℃に冷
却される。By the way, in alloyed hot-dip galvanizing, the temperature adjustment of the steel strip before immersing it in a zinc bath is usually done by heating it to a high temperature, which also serves as annealing, and then cooling it to a predetermined temperature. In the illustrated example apparatus, the steel strip A is first heated in the heating zone 18 in the annealing furnace 12 as described above.
00°C and then cooled in cooling zone 20 to about 470°C.
このような冷却は通常ガスジェット冷却方式等の方法に
よって行なわれるので、応答が非常に速い。 従って、
瞬時に亜鉛浴１４に浸漬する鋼帯Ａの温度を変化させる
ことが可能であり、本発明の合金化溶融亜鉛めっき鋼帯
の製造方法は、従来の方法のように合金化炉における再
加熱温度を上昇（降下）させる間の合金化不足（合金化
過剰）を生じることがなく、非常に効率よく合金化溶融
亜鉛めっき鋼帯を製造することが可能である。Since such cooling is normally performed by a method such as a gas jet cooling method, the response is very fast. Therefore,
It is possible to instantly change the temperature of the steel strip A immersed in the zinc bath 14, and the method for producing an alloyed hot-dip galvanized steel strip of the present invention can change the reheating temperature in the alloying furnace as in the conventional method. It is possible to produce an alloyed hot-dip galvanized steel strip very efficiently without causing insufficient alloying (overalloying) during raising (lowering).
なお、本発明の製造方法において、冷却帯２０における
鋼帯Ａ冷却温度調整方法としては、例えば図示例のガス
ジェット方式の場合、冷却用ガスの吹き付は量を調整す
る方法、冷却用ガスのガス温度を調整する方法等、公知
の方法がいずれも通用可能である。In the manufacturing method of the present invention, the method of adjusting the cooling temperature of the steel strip A in the cooling zone 20 includes, for example, in the case of the gas jet method shown in the drawing, a method of adjusting the amount of cooling gas sprayed, a method of adjusting the amount of cooling gas sprayed, Any known method, such as a method of adjusting gas temperature, can be used.
以上の説明においては、本発明の第２の態様では合金化
炉１６の再加熱温度を直接測定して、この結果に応じて
冷却帯２０における鋼帯Ａの冷却温度を調整するもので
あったが、本発明の第２の態様はこれに限定されるもの
ではなく、合金化度計２４による合金化度の測定結果よ
り合金化炉１６の温度を読み取って、冷却帯２０におけ
る鋼帯Ａの冷却温度を調整し、亜鉛浴１４へ浸漬する鋼
帯Ａの温度を調整するものであってもよい。In the above explanation, in the second aspect of the present invention, the reheating temperature of the alloying furnace 16 is directly measured, and the cooling temperature of the steel strip A in the cooling zone 20 is adjusted according to this result. However, the second aspect of the present invention is not limited to this, and the temperature of the alloying furnace 16 is read from the measurement result of the degree of alloying by the degree of alloying meter 24, and the temperature of the steel strip A in the cooling zone 20 is measured. The cooling temperature may be adjusted to adjust the temperature of the steel strip A immersed in the zinc bath 14.
また、本発明の第２の態様を実施する装置においては、
合金化度計２４は必ずしも配置される必要はない、
しかしながら、めっき装置全体の管理や、得られた合金
化溶融亜鉛めっき鋼帯の品質管理等の点で、合金化度計
２４が配置されるのが好ましいのは当然のことである。Further, in the apparatus implementing the second aspect of the present invention,
The degree of alloying meter 24 does not necessarily need to be arranged,
However, it is a matter of course that the degree of alloying meter 24 is preferably disposed in terms of managing the entire plating apparatus and controlling the quality of the obtained alloyed hot-dip galvanized steel strip.
〈実施例〉
以下、本発明の具体的実施例を上げ、本発明をより詳細
に説明する。<Example> Hereinafter, the present invention will be explained in more detail by giving specific examples of the present invention.
第１図に示されるめっき装置１０を用いて、本発明の合
金化溶融亜鉛めっき鋼帯の製造方法によって、合金化溶
融亜鉛めっき鋼帯を製造した。EXAMPLES An alloyed hot-dip galvanized steel strip was manufactured using the plating apparatus 10 shown in FIG. 1 according to the method for manufacturing an alloyed hot-dip galvanized steel strip of the present invention.
鋼帯Ａは、板厚９．８１１１１．板巾１５００ｍｍのも
のを用い、これをラインスピード９０ｍｐｍで走行させ
た。Steel strip A has a plate thickness of 9.81111. A plate with a width of 1500 mm was used and was run at a line speed of 90 mpm.
この鋼帯Ａを焼鈍炉１２の加熱帯１８で８００℃に加熱
し、次いで、冷却帯２０において４７０℃迄冷却した後
、浴温４６０℃の亜鉛浴１４に浸漬した。This steel strip A was heated to 800°C in the heating zone 18 of the annealing furnace 12, then cooled to 470°C in the cooling zone 20, and then immersed in the zinc bath 14 with a bath temperature of 460°C.
亜鉛浴１４に浸漬した鋼帯Ａは、略鉛直方向に引き上げ
ることにより亜鉛浴１４から排出し、次いで気体絞り用
ノズル２２によって亜鉛付看量を４５ ｇ／ｍ’に調整
したのち、合金化炉１６で５００℃に再加熱して合金化
を行なった。 なお、合金化炉１６における加熱時間は
１２秒であった。The steel strip A immersed in the zinc bath 14 is discharged from the zinc bath 14 by being pulled up in a substantially vertical direction, and then the amount of zinc applied is adjusted to 45 g/m' with a gas throttling nozzle 22, and then placed in an alloying furnace. Alloying was performed by reheating at 500° C. in Step 16. Note that the heating time in the alloying furnace 16 was 12 seconds.
合金化炉１６の上方に配置されるＸ線回折を適用した合
金化度計２４によって鋼帯Ａの合金化度を測定したとこ
ろ、めっき層中のＦｅ濃度が１０％の所定の合金化度を
有する合金化溶融亜鉛めっき鋼帯が得られた。When the degree of alloying of the steel strip A was measured by the degree of alloying meter 24 that applied X-ray diffraction, which was placed above the alloying furnace 16, it was found that the degree of alloying of the steel strip A was at a predetermined degree of alloying with an Fe concentration of 10% in the plating layer. An alloyed hot-dip galvanized steel strip was obtained.
ここで、鋼帯Ａの板厚が１．２ｍ−に変化して、合金化
炉１６における再加熱温度が４８５℃に低下したので、
冷却帯２０における冷却温度を調整して、亜鉛浴１４に
浸漬する鋼帯Ａの温度を４９５℃に上昇させた所、合金
化度の低下は起こらず、同様の所定の合金化度を有する
合金化溶融亜鉛めっき鋼帯を得ることができた。Here, the thickness of the steel strip A changed to 1.2 m-, and the reheating temperature in the alloying furnace 16 decreased to 485°C, so
When the cooling temperature in the cooling zone 20 was adjusted to raise the temperature of the steel strip A immersed in the zinc bath 14 to 495°C, the degree of alloying did not decrease, and the alloy having the same predetermined degree of alloying did not occur. A galvanized steel strip could be obtained.
なお、上記の亜鉛浴１４へ浸漬する鋼帯Ａの温度の調節
は合金化度計２４による合金化度の測定結果を、合金化
度−鋼帯温度変換手段を介して冷却帯２０の温度調節計
（図示せず）にフィードバックすることにより行なった
。Note that the temperature of the steel strip A immersed in the zinc bath 14 is adjusted by adjusting the temperature of the cooling zone 20 using the measurement results of the degree of alloying by the degree of alloying meter 24 through the degree of alloying - steel strip temperature conversion means. This was done by providing feedback to a meter (not shown).
一方、従来法のように、合金化炉１６における再加熱温
度の低下に伴ない、合金化炉１６に供給する燃料投入量
を増加（約１．６倍）した場合には、合金化炉１６にお
ける再加熱温度が４８５℃から５００℃に復帰するのに
約１０分間の時間を要してしまい、この間に合金化炉１
６を通過した鋼帯は（９００ｍ）は、前述の所定の合金
化度にならない、合金化不足の合金化溶融亜鉛めっき鋼
帯となってしまった。On the other hand, when the amount of fuel supplied to the alloying furnace 16 is increased (approximately 1.6 times) as the reheating temperature in the alloying furnace 16 decreases as in the conventional method, It takes about 10 minutes for the reheating temperature to return from 485°C to 500°C, and during this time the alloying furnace 1
The steel strip that passed through No. 6 (900 m) became an insufficiently alloyed galvanized steel strip that did not have the above-mentioned predetermined degree of alloying.
以上の結果より、本発明の効果は明らかである。From the above results, the effects of the present invention are clear.
〈発明の効果〉
以上詳細に説明したように、本発明の合金化溶融亜鉛め
っき鋼帯の製造方法によれば、鋼帯の板厚や板巾が変化
したり、鋼帯への溶融亜鉛の付着量が変化して、合金化
処理の再加熱温度が変化した場合等においても、亜鉛浴
に浸漬する鋼帯の温度を調整することにより、合金化度
を調整するので、合金化不足や合金化過剰といった品質
不良が発生することがなく、良好な合金化溶融亜鉛めっ
き鋼帯を得ることができる。<Effects of the Invention> As explained in detail above, according to the method for manufacturing an alloyed hot-dip galvanized steel strip of the present invention, the thickness and width of the steel strip may change, and the hot-dip zinc may not be applied to the steel strip. Even if the amount of adhesion changes and the reheating temperature for alloying treatment changes, the degree of alloying is adjusted by adjusting the temperature of the steel strip immersed in the zinc bath. A good alloyed hot-dip galvanized steel strip can be obtained without causing quality defects such as overcoating.
しかも、この鋼帯温度の調整は、従来の方法のように合
金化の再加熱温度を変化させる場合と異なり、瞬時に行
なうことが可能であるので、ロスも非常に少なくするこ
とが可能であり、非常に高効率である。Moreover, this adjustment of the steel strip temperature can be done instantaneously, unlike the conventional method of changing the reheating temperature for alloying, so it is possible to significantly reduce losses. , very high efficiency.
さらに、鋼帯の走行速度を変更させる必要がないので生
産性を阻害することもなく、また、通板材と呼ばれるダ
ミー鋼帯を使用する必要もないので、生産性も向上する
。Furthermore, since there is no need to change the traveling speed of the steel strip, productivity is not hindered, and there is no need to use a dummy steel strip called a threading material, so productivity is also improved.
第１図は、本発明の合金化溶融亜鉛めっき鋼帯の製造方
法を実施する合金化溶融亜鉛めっき装置の一例の概念図
である。
第２図は、亜鉛浴に浸漬する鋼帯の温度をパラメータと
した合金化炉における処理温度と亜鉛めっき層の合金化
度との関係を示す概念図である。
２ム
ＦＩＧ、１
符号の説明
１０・・・合金化溶融亜鉛めっき装置、１２・・・焼鈍
炉、
１４・・・亜鉛浴、
１６・・・合金化炉、
１８・・・加熱帯、
２０・・・冷却帯、
２２・・・気体絞り用ノズル、
２４・・・合金化度計、
Ａ・・・鋼帯FIG. 1 is a conceptual diagram of an example of an alloying hot-dip galvanizing apparatus for carrying out the method for producing an alloyed hot-dip galvanized steel strip of the present invention. FIG. 2 is a conceptual diagram showing the relationship between the processing temperature in the alloying furnace and the degree of alloying of the galvanized layer, with the temperature of the steel strip immersed in the zinc bath as a parameter. 2mu FIG, 1 Explanation of symbols 10... Alloying hot-dip galvanizing device, 12... Annealing furnace, 14... Zinc bath, 16... Alloying furnace, 18... Heating zone, 20. ...Cooling zone, 22...Nozzle for gas throttling, 24...Alloying degree meter, A... Steel strip
Claims (2)
度まで冷却した鋼帯を、亜鉛浴に浸漬し、次いで亜鉛付
着量を制御した後、合金化処理を行なう合金化溶融亜鉛
めっき鋼帯の製造方法において、 前記合金化処理後の亜鉛めっきの合金化度を測定し、そ
の測定結果に応じて、亜鉛めっきの合金化度が所定の目
標値に成るように、前記亜鉛浴に浸漬する前記鋼帯の温
度を調整することを特徴とする合金化溶融亜鉛めっき鋼
帯の製造方法。(1) A steel strip that has been heated to a predetermined temperature in an annealing furnace and then cooled to a predetermined temperature is immersed in a zinc bath, and after controlling the amount of zinc deposited, an alloyed hot-dip galvanized steel strip is subjected to alloying treatment. In the manufacturing method, the degree of alloying of the zinc plating after the alloying treatment is measured, and according to the measurement result, the step of immersing the zinc plating in the zinc bath so that the degree of alloying of the zinc plating reaches a predetermined target value. A method for producing an alloyed hot-dip galvanized steel strip, the method comprising adjusting the temperature of the steel strip.
度まで冷却した鋼帯を、亜鉛浴に浸漬し、次いで亜鉛付
着量を制御した後、合金化処理を行なう合金化溶融亜鉛
めっき鋼帯の製造方法において、 前記合金化処理における処理温度と前記亜鉛浴に浸漬す
る鋼帯の温度との関係を、亜鉛めっきの合金化度が所定
の目標値になるように予め設定しておき、前記合金化処
理における処理温度の変化に応じて前記亜鉛浴に浸漬す
る鋼帯の温度を、前記関係に基づいて調整することを特
徴とする合金化溶融亜鉛めっき鋼帯の製造方法。(2) A steel strip that has been heated to a predetermined temperature in an annealing furnace and then cooled to a predetermined temperature is immersed in a zinc bath, and after controlling the amount of zinc deposited, an alloyed hot-dip galvanized steel strip is subjected to an alloying treatment. In the manufacturing method, the relationship between the treatment temperature in the alloying treatment and the temperature of the steel strip immersed in the zinc bath is set in advance so that the degree of alloying of the zinc plating becomes a predetermined target value, and the alloy A method for manufacturing an alloyed hot-dip galvanized steel strip, characterized in that the temperature of the steel strip immersed in the zinc bath is adjusted based on the relationship described above in accordance with changes in treatment temperature in the oxidation treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1238298A JPH0645851B2 (en) | 1989-09-13 | 1989-09-13 | Method for producing alloyed hot-dip galvanized steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1238298A JPH0645851B2 (en) | 1989-09-13 | 1989-09-13 | Method for producing alloyed hot-dip galvanized steel strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03100154A true JPH03100154A (en) | 1991-04-25 |
| JPH0645851B2 JPH0645851B2 (en) | 1994-06-15 |
Family
ID=17028120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1238298A Expired - Fee Related JPH0645851B2 (en) | 1989-09-13 | 1989-09-13 | Method for producing alloyed hot-dip galvanized steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0645851B2 (en) |
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| US10085776B2 (en) | 2004-02-06 | 2018-10-02 | Spinal Elements, Inc. | Vertebral facet joint prosthesis and method of fixation |
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| US10251679B2 (en) | 2013-03-14 | 2019-04-09 | Spinal Elements, Inc. | Apparatus for bone stabilization and distraction and methods of use |
| US10368921B2 (en) | 2011-02-24 | 2019-08-06 | Spinal Elements, Inc. | Methods and apparatus for stabilizing bone |
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| US10624680B2 (en) | 2013-09-27 | 2020-04-21 | Spinal Elements, Inc. | Device and method for reinforcement of a facet |
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| US11304733B2 (en) | 2020-02-14 | 2022-04-19 | Spinal Elements, Inc. | Bone tie methods |
| US11457959B2 (en) | 2019-05-22 | 2022-10-04 | Spinal Elements, Inc. | Bone tie and bone tie inserter |
| US11464552B2 (en) | 2019-05-22 | 2022-10-11 | Spinal Elements, Inc. | Bone tie and bone tie inserter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52123935A (en) * | 1976-04-13 | 1977-10-18 | Nisshin Steel Co Ltd | Method of fabricating alloyed zinc iron plate |
| JPS6240353A (en) * | 1985-08-14 | 1987-02-21 | Sumitomo Metal Ind Ltd | Production of alloyed zinc plated steel sheet |
| JPS6240352A (en) * | 1985-08-14 | 1987-02-21 | Sumitomo Metal Ind Ltd | Production of alloyed zinc plated steel sheet |
| JPS6240354A (en) * | 1985-08-14 | 1987-02-21 | Sumitomo Metal Ind Ltd | Production of alloyed zinc plated steel sheet |
-
1989
- 1989-09-13 JP JP1238298A patent/JPH0645851B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52123935A (en) * | 1976-04-13 | 1977-10-18 | Nisshin Steel Co Ltd | Method of fabricating alloyed zinc iron plate |
| JPS6240353A (en) * | 1985-08-14 | 1987-02-21 | Sumitomo Metal Ind Ltd | Production of alloyed zinc plated steel sheet |
| JPS6240352A (en) * | 1985-08-14 | 1987-02-21 | Sumitomo Metal Ind Ltd | Production of alloyed zinc plated steel sheet |
| JPS6240354A (en) * | 1985-08-14 | 1987-02-21 | Sumitomo Metal Ind Ltd | Production of alloyed zinc plated steel sheet |
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| US10085776B2 (en) | 2004-02-06 | 2018-10-02 | Spinal Elements, Inc. | Vertebral facet joint prosthesis and method of fixation |
| US10022161B2 (en) | 2011-02-24 | 2018-07-17 | Spinal Elements, Inc. | Vertebral facet joint fusion implant and method for fusion |
| US11464551B2 (en) | 2011-02-24 | 2022-10-11 | Spinal Elements, Inc. | Methods and apparatus for stabilizing bone |
| US10368921B2 (en) | 2011-02-24 | 2019-08-06 | Spinal Elements, Inc. | Methods and apparatus for stabilizing bone |
| USD834194S1 (en) | 2011-10-26 | 2018-11-20 | Spinal Elements, Inc. | Interbody bone implant |
| USD979062S1 (en) | 2011-10-26 | 2023-02-21 | Spinal Elements, Inc. | Interbody bone implant |
| USD857900S1 (en) | 2011-10-26 | 2019-08-27 | Spinal Elements, Inc. | Interbody bone implant |
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| US11272961B2 (en) | 2013-03-14 | 2022-03-15 | Spinal Elements, Inc. | Apparatus for bone stabilization and distraction and methods of use |
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| US11478275B2 (en) | 2014-09-17 | 2022-10-25 | Spinal Elements, Inc. | Flexible fastening band connector |
| US10758361B2 (en) | 2015-01-27 | 2020-09-01 | Spinal Elements, Inc. | Facet joint implant |
| US11464552B2 (en) | 2019-05-22 | 2022-10-11 | Spinal Elements, Inc. | Bone tie and bone tie inserter |
| US11457959B2 (en) | 2019-05-22 | 2022-10-04 | Spinal Elements, Inc. | Bone tie and bone tie inserter |
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Also Published As
| Publication number | Publication date |
|---|---|
| JPH0645851B2 (en) | 1994-06-15 |
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