JP3219010B2 - Hot-rolled steel sheet hot dip coating equipment and hot-dip coated steel sheet manufacturing method - Google Patents
Hot-rolled steel sheet hot dip coating equipment and hot-dip coated steel sheet manufacturing methodInfo
- Publication number
- JP3219010B2 JP3219010B2 JP05542797A JP5542797A JP3219010B2 JP 3219010 B2 JP3219010 B2 JP 3219010B2 JP 05542797 A JP05542797 A JP 05542797A JP 5542797 A JP5542797 A JP 5542797A JP 3219010 B2 JP3219010 B2 JP 3219010B2
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- hot
- acid solution
- immersed
- dip
- 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
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、熱延鋼板の上に亜
鉛系金属を溶融めっきする溶融めっき設備および溶融め
っき鋼板の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-dip galvanizing apparatus for hot-rolling a zinc-based metal on a hot-rolled steel sheet and a method for producing the hot-dip coated steel sheet.
【０００２】[0002]
【従来の技術】一般に、熱延下地溶融亜鉛めっき鋼板
は、熱間圧延ラインにおいて圧延された熱延鋼板を、コ
イルに巻き取り、常温まで冷却した後、酸洗ラインにお
いて８０〜９０℃程度の温度にて酸洗することにより、
熱延時に鋼板表面に生成したスケールを除去し、連続式
溶融めっきラインにおいて所定の還元性雰囲気を保った
焼鈍炉内で鋼板を７００〜８００℃程度の温度にて還元
焼鈍し、その雰囲気を保ったまま連続的に溶融めっきを
施して製造されている。すなわち、従来の連続式溶融め
っきラインは、図３に示すように、焼鈍炉４と溶融めっ
き槽５とを備えた溶融めっき装置３を有し、コイル１か
ら繰り出された熱延鋼板２が、まず焼鈍炉４で還元焼鈍
され、その後、溶融めっき槽５により連続的にめっきが
施される。2. Description of the Related Art Generally, a hot-rolled hot-dip galvanized steel sheet is formed by winding a hot-rolled steel sheet rolled in a hot rolling line into a coil, cooling it to room temperature, and then heating it to about 80 to 90 ° C. in a pickling line. By pickling at temperature,
The scale formed on the surface of the steel sheet during hot rolling is removed, and the steel sheet is subjected to reduction annealing at a temperature of about 700 to 800 ° C. in an annealing furnace in which a predetermined reducing atmosphere is maintained in a continuous hot-dip coating line, and the atmosphere is maintained. It is manufactured by continuous hot-dip plating as it is. That is, as shown in FIG. 3, the conventional continuous hot-dip galvanizing line has a hot-dip plating apparatus 3 including an annealing furnace 4 and a hot-dip plating tank 5, and a hot-rolled steel sheet 2 unwound from the coil 1 is First, reduction annealing is performed in an annealing furnace 4, and thereafter, plating is continuously performed by a hot-dip plating tank 5.
【０００３】これは、めっき浴浸潰時に鋼板の表面に酸
化膜が多量に存在すると、鋼板とめっき浴の反応が妨げ
られてめっきの密着性が劣化したり、亜鉛系金属がはじ
かれて不めっきを生じ、外観ならびに耐食性が低下する
ため、それを防止する意図からなされるものである。[0003] This is because if a large amount of an oxide film is present on the surface of the steel sheet when the plating bath is immersed, the reaction between the steel sheet and the plating bath is hindered, and the adhesion of the plating is deteriorated, or the zinc-based metal is repelled and unreliable. This is intended to prevent the occurrence of plating and deterioration of appearance and corrosion resistance.
【０００４】したがって、熱延鋼板は酸洗ラインを経る
ことによって熱延時に鋼板表面に生成したスケールを完
全に除去すること、および連続式溶融めっきラインにお
いて７００〜８００℃程度の高温にまで加熱し、還元焼
鈍することが不可欠であった。しかしながら、酸洗ライ
ンを経ることは、その搬送費ならびに運転費の増大を招
くことになる。[0004] Therefore, the hot-rolled steel sheet passes through the pickling line to completely remove the scale formed on the steel sheet surface during the hot rolling, and is heated to a high temperature of about 700 to 800 ° C in the continuous hot-dip plating line. However, reduction annealing was indispensable. However, passing through the pickling line causes an increase in the transportation cost and the operation cost.
【０００５】そこで、特公昭５１−４００１８号公報に
は、酸洗処理とめっき処理を同一ラインにて連続的に処
理することに着目し、熱延鋼板を硫酸と塩酸の混酸より
なる酸洗処理液中を通してスケールを除去し引き続いて
連続するめっき工程に通して亜鉛めっきする技術（以
下、従来技術１という）が提案されている。また、特開
平４−３０４３５７号公報には、酸洗の後にバフロール
によるブラッシングを施した後に、溶融めっきする技術
（以下、従来技術２という）、特開平８−８１７４８号
公報には酸洗後に電解清浄により脱スマットし、次いで
溶融亜鉛めっきする技術（以下、従来技術３という）が
開示されている。Therefore, Japanese Patent Publication No. 51-40018 discloses that pickling treatment and plating treatment are continuously performed on the same line, and the hot-rolled steel sheet is pickled by a mixed acid of sulfuric acid and hydrochloric acid. There has been proposed a technique (hereinafter referred to as Conventional Technique 1) in which scale is removed through a solution and subsequently zinc plating is performed through a continuous plating process. Japanese Patent Application Laid-Open No. 4-304357 discloses a technique in which buffing is performed after pickling, followed by hot-dip plating (hereinafter referred to as prior art 2). Japanese Patent Application Laid-Open No. 8-81748 discloses an electrolysis after pickling. A technique of desmutting by cleaning and then hot-dip galvanizing (hereinafter referred to as prior art 3) is disclosed.
【０００６】また、酸洗ラインを経ることは、その設備
の設置ならびに運転に莫大なコストと時間を要するこに
なる。そこで、この酸洗工程を省略するという考えに基
づいた溶融めっき鋼板の製造方法として、特開昭５４−
１３３４３８号公報には熱延鋼板を圧下率４０％以上の
冷間圧延を施した後に水素濃度４％以上の還元性雰囲気
内で還元焼鈍し溶融亜鉛めっきする技術（以下、従来技
術４という）が、特開平６−２７９９６７号公報には熱
延鋼板の表面酸化皮膜厚に合わせて、還元処理条件を制
御する技術（以下、従来技術５という）が開示されてい
る。[0006] Further, passing through the pickling line requires enormous cost and time for installation and operation of the equipment. Therefore, as a method of manufacturing a hot-dip coated steel sheet based on the idea of omitting the pickling step, Japanese Patent Application Laid-Open No.
No. 133438 discloses a technique of subjecting a hot-rolled steel sheet to cold rolling at a rolling reduction of 40% or more and then reducing and annealing in a reducing atmosphere having a hydrogen concentration of 4% or more to perform hot-dip galvanizing (hereinafter referred to as prior art 4). Japanese Patent Application Laid-Open No. 6-279967 discloses a technique for controlling reduction treatment conditions in accordance with the thickness of a surface oxide film of a hot-rolled steel sheet (hereinafter referred to as prior art 5).
【０００７】一方、めっき密着性に必要な表面清浄性を
確保するために、連続式溶融めっきラインを７００〜８
００℃程度の高温に加熱することは、膨大なエネルギー
と長大な加熱炉を必要とし、操業コスト負担の増加を招
く。さらに、その後めっき浴の温度（５００℃程度）近
傍まで冷却することは熱エネルギーの多大な損失とな
る。さらに、高温の水素雰囲気中では鋼板に水素が吸蔵
され、めっき後、この水素が鋼板とめっき皮膜の界面に
放出され、めっき皮膜に膨れ状欠陥を発生させる問題も
ある。On the other hand, in order to secure the surface cleanliness required for the adhesion of the plating, a continuous hot-dip plating line is set at 700-8.
Heating to a high temperature of about 00 ° C. requires enormous energy and a long heating furnace, and causes an increase in operating cost burden. Further, cooling to near the temperature of the plating bath (about 500 ° C.) thereafter results in a large loss of thermal energy. Furthermore, in a high-temperature hydrogen atmosphere, hydrogen is occluded in the steel sheet, and after plating, this hydrogen is released to the interface between the steel sheet and the plating film, causing a problem that swelling defects occur in the plating film.
【０００８】これらの問題を解決する手段として、特開
平４−３４６６４５号公報には、熱延鋼板を酸洗後Ｎｉ
プレめっきを行い、４３０〜５００℃に加熱後、溶融亜
鉛めっきを施す技術（以下、従来技術６という）が開示
されている。As means for solving these problems, Japanese Patent Application Laid-Open No. Hei 4-346645 discloses a method in which a hot-rolled steel sheet is pickled after nickel pickling.
A technique of performing pre-plating, heating to 430 to 500 ° C., and then performing hot-dip galvanizing (hereinafter referred to as Conventional Technique 6) is disclosed.
【０００９】ところで、熱延鋼板の脱スケールに酸洗処
理に関し、本発明者らは、鋼板を加熱する鋼板加熱部
と、鋼板が浸漬される酸洗槽部とを備え、鋼板を酸液に
浸漬して連続的に脱スケール処理する薄鋼板の高速酸洗
装置ならびに高速酸洗方法を提案している（特開平７−
１９７２８２号公報；以下従来技術７という）。Regarding descaling of a hot-rolled steel sheet, the present inventors have provided a steel sheet heating section for heating the steel sheet, and a pickling tank section for immersing the steel sheet. A high-speed pickling apparatus and a high-speed pickling method for a thin steel sheet which is immersed and continuously descaled have been proposed (Japanese Patent Laid-Open No. 7-1995).
197282, hereinafter referred to as prior art 7).
【００１０】[0010]
【発明が解決しようとする課題】しかしながら、上述し
た従来技術１〜７には個々に以下のような問題点があ
る。従来技術１においては、酸洗によって熱延鋼板を脱
スケールすると、セメンタイトを主体とするスマットが
鋼板表面に残存し、還元焼鈍時に分解除去されないスマ
ットに起因するめっきはじき（いわゆる不めっき）が発
生する。However, the above-mentioned prior arts 1 to 7 individually have the following problems. In the prior art 1, when the hot-rolled steel sheet is descaled by pickling, smut mainly composed of cementite remains on the steel sheet surface, and plating repelling (so-called non-plating) caused by the smut that is not decomposed and removed during reduction annealing occurs. .
【００１１】従来技術２においては、酸洗時に生成した
スマットはバフロールによる研削である程度除去される
ものの、鋼板が湾曲している場合や、鋼板表面にミクロ
凹凸が存在する場合には、均一にブラシが当たらないた
め、局部的にスマットが残存しやすい。また、ブラシロ
ールの毛抜けが、欠陥を発生させたり、ブラシロールの
不均一による線状ムラやチャーターマークなどが発生し
外観を損なうなどの問題点もある。In the prior art 2, the smut generated during the pickling is removed to some extent by grinding with a buff roll. However, when the steel sheet is curved or micro unevenness is present on the surface of the steel sheet, the brush is uniformly brushed. Is not applied, so that smut tends to remain locally. In addition, there are also problems such as hair loss of the brush roll causing a defect and unevenness of the brush roll resulting in linear unevenness and charter marks, which impair the appearance.
【００１２】従来技術３においては、上記従来技術２の
ような問題点は解決されるが、電解設備が必要となり、
操業コストの増大を招く。従来技術４においては、冷間
圧延してスケールを薄くすることで還元焼鈍時のスケー
ル還元を補助するものであるが、冷間圧延のための莫大
な設備が必要であり、材質的に不安定になる問題があ
る。In the prior art 3, although the problems as in the above prior art 2 are solved, an electrolytic facility is required.
This leads to an increase in operating costs. In the prior art 4, the scale reduction during the reduction annealing is assisted by thinning the scale by cold rolling. However, enormous facilities for cold rolling are required, and the material is unstable. Problem.
【００１３】従来技術５においては、通常のスケール厚
さでの利用も可能であるが、還元処理にかかる温度・時
間・Ｈ2 濃度が増すために、操業コスト・設備コストを
上昇させる。さらに、鋼板に溶融めっき処理を施す前に
スケール厚さを測定する必要があるが、これは連続処理
を妨げ、生産性に悪影響を与える。In the prior art 5, although it is possible to use it with a normal scale thickness, since the temperature, time, and H2 concentration required for the reduction treatment are increased, the operating cost and equipment cost are increased. In addition, it is necessary to measure the scale thickness before hot-dip coating the steel sheet, which hinders continuous processing and adversely affects productivity.
【００１４】従来技術６においては、前処理としてＮｉ
プレめっきを施すため、プレめっきのための設備コスト
が増大する問題点がある。従来技術７においては、薄鋼
板の酸洗時に、鋼板を加熱した後酸液に浸漬し、酸液が
核沸騰状態になるように制御することにより、熱衝撃に
よるスケールの破壊と沸騰による酸液の新陳代謝を促進
することによって、高速酸洗を達成する方法であるが、
鋼板の下面側では、沸騰時の気泡が鋼板表面から離脱し
難く、酸洗速度が小さくなるとともに、上面との間で脱
スケール状態が異なるという問題がある。In the prior art 6, Ni is used as a pretreatment.
Since the pre-plating is performed, there is a problem that the equipment cost for the pre-plating increases. In the prior art 7, when pickling a thin steel sheet, the steel sheet is heated and then immersed in an acid solution to control the acid solution to a nucleate boiling state. Is a method of achieving high-speed pickling by promoting the metabolism of
On the lower surface side of the steel sheet, there is a problem that bubbles at the time of boiling hardly separate from the surface of the steel sheet, the pickling speed is reduced, and the descaling state is different from the upper surface.
【００１５】さらに、薄鋼板の連続溶融めっき装置の酸
洗においては、通常の薄鋼板の酸洗の場合と異なり、常
に一定条件で酸洗することが困難であった。すなわち、
薄鋼板の酸洗の場合には、挿入される鋼板の速度は一定
に保たれているため、鋼板が酸洗槽中に浸漬されている
時間が一定であることから、常に同じ状態での脱スケー
ル酸洗が可能であるが、連続溶融めっき装置において
は、焼鈍炉にて鋼板を加熱する必要があり、焼鈍炉能力
の制約から挿入される鋼板の板厚によっては鋼板の速度
が大きく変動するため、酸洗槽中に浸漬されている時間
が変わり、酸洗速度を調節する必要がある。Furthermore, in pickling of a continuous hot-dip coating apparatus for thin steel sheets, it is difficult to always pickle under constant conditions, unlike the case of pickling of ordinary thin steel sheets. That is,
When pickling thin steel sheets, the speed of the inserted steel sheet is kept constant, and the time during which the steel sheet is immersed in the pickling tank is constant. Although scale pickling is possible, in continuous hot-dip coating equipment, it is necessary to heat the steel sheet in an annealing furnace, and the speed of the steel sheet greatly varies depending on the thickness of the inserted steel sheet due to the limitation of the annealing furnace capacity. Therefore, the time of immersion in the pickling tank changes, and it is necessary to adjust the pickling speed.
【００１６】本発明は、かかる事情に鑑みてなされたも
のであって、通常行われる熱延鋼板の脱スケール酸洗工
程を連続式溶融めっきラインに組み込んで、生産コスト
を低減すると共に、従来から問題となっていた、酸洗速
度が遅いという問題、酸洗後のスマット除去の問題、還
元焼鈍時の加熱温度低減の問題を一挙に解決し、操業コ
スト・設備コストを低減し、連続式溶融めっき設備を前
提とした、高速酸洗が可能であり、安価でめっき密着性
に優れた溶融めっき鋼板を製造することが可能な熱延板
の溶融めっき設備および溶融めっき鋼板の製造方法を提
供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and incorporates a usual descaling pickling process of a hot-rolled steel sheet into a continuous hot-dip galvanizing line to reduce production costs and reduce the production cost. The problems of slow pickling speed, removal of smut after pickling, and reduction of heating temperature during reduction annealing were all solved at once, reducing operating and equipment costs, and continuous melting. Provided is a hot-rolled hot-dip galvanizing equipment and a hot-dip galvanized steel sheet manufacturing method capable of performing high-speed pickling, inexpensive, and excellent in hot-dip galvanized steel sheet, assuming plating equipment. The purpose is to:
【００１７】[0017]
【課題を解決するための手段】上記の課題を解決するた
めに、第１発明では、連続溶融めっき装置と、その入側
に配置された鋼板を加熱する鋼板加熱部と、鋼板加熱部
と前記めっき装置との間に設けられた、鋼板が浸漬され
る酸洗槽部と、前記酸洗槽部に浸漬された鋼板の少なく
とも一方の面に酸液を噴射する酸液噴射装置とを具備す
ることを特徴とする、熱延鋼板の溶融めっき設備を提供
する。According to a first aspect of the present invention, there is provided a continuous hot-dip coating apparatus, a steel sheet heating section for heating a steel sheet disposed on an entrance side thereof, a steel sheet heating section, A pickling tank section provided with a plating apparatus, in which the steel sheet is immersed, and an acid solution spraying apparatus that sprays an acid solution on at least one surface of the steel sheet immersed in the pickling tank section. A hot-rolled steel sheet hot-dip plating facility is provided.
【００１８】また、第２発明では、熱延鋼板に亜鉛系の
金属または合金を溶融めっきして溶融めっき鋼板を製造
する方法であって、熱延鋼板を酸液よりも高い温度に加
熱し、加熱直後に鋼板を酸液に浸漬し、浸漬された鋼板
の少なくとも一方の面に酸液を噴射することにより脱ス
ケール酸洗処理し、引き続き、前記処理が施された熱延
鋼板を連続溶融めっき装置に導入して該熱延鋼板に溶融
めっきを施すことを特徴とする、溶融めっき鋼板の製造
方法を提供する。Further, the second invention is a method for producing a hot-dip coated steel sheet by hot-dip coating a zinc-based metal or alloy on a hot-rolled steel sheet, wherein the hot-rolled steel sheet is heated to a temperature higher than the acid solution. Immediately after heating, the steel sheet is immersed in an acid solution, and descaling pickling treatment is performed by injecting the acid solution onto at least one surface of the immersed steel sheet. A hot-rolled steel sheet is provided with a hot-rolled steel sheet, and the hot-rolled steel sheet is subjected to hot-dip plating.
【００１９】さらに、第３発明では、第２発明におい
て、熱延鋼板の加熱に際して、鋼板が酸液に浸漬された
時に酸液が核沸騰状態になる温度域まで鋼板を加熱し、
加熱直後に鋼板を酸液に浸漬し、所定の時間経過後、浸
漬された鋼板の少なくとも一方の面に酸液を噴射するこ
とを特徴とする、溶融めっき鋼板の製造方法を提供す
る。Further, in the third invention, in the second invention, in heating the hot-rolled steel sheet, the steel sheet is heated to a temperature range where the acid solution is brought into a nucleate boiling state when the steel sheet is immersed in the acid solution,
A method for producing a hot-dip coated steel sheet, characterized by immersing a steel sheet in an acid solution immediately after heating and, after a lapse of a predetermined time, injecting the acid solution onto at least one surface of the immersed steel sheet.
【００２０】さらにまた、第４発明では、第２発明にお
いて、熱延鋼板の加熱に際して、鋼板が酸液に浸漬され
た時に酸液が膜沸騰状態になる温度域まで鋼板を加熱
し、加熱直後に鋼板を酸液に浸漬し、所定の時間経過
後、浸漬された鋼板の少なくとも一方の面に酸液を噴射
することを特徴とする、溶融めっき鋼板の製造方法を提
供する。Further, in the fourth invention, in the second invention, when heating the hot-rolled steel sheet, the steel sheet is heated to a temperature range in which the acid solution is in a film boiling state when the steel sheet is immersed in the acid solution, and immediately after the heating. The present invention also provides a method for producing a hot-dip coated steel sheet, characterized by immersing a steel sheet in an acid solution and, after a lapse of a predetermined time, injecting the acid solution onto at least one surface of the immersed steel sheet.
【００２１】さらにまた、第５発明では、第２発明ない
し第４発明のいずれかにおいて、挿入される熱延鋼板お
よびその挿入速度に応じて、鋼板の加熱温度を制御する
ことを特徴とする、溶融めっき鋼板の製造方法を提供す
る。Furthermore, in a fifth invention, in any one of the second invention to the fourth invention, the heating temperature of the steel sheet is controlled according to the hot-rolled steel sheet to be inserted and the insertion speed thereof. Provided is a method for manufacturing a hot-dip coated steel sheet.
【００２２】さらにまた、第６発明では、第２発明ない
し第５発明のいずれかにおいて、挿入される熱延鋼板お
よびその挿入速度、ならびに鋼板の加熱温度に応じて、
酸液に浸漬された鋼板の少なくとも一方の面に噴射され
る酸液の流速を制御することを特徴とする、溶融めっき
鋼板の製造方法を提供する。Further, in the sixth invention, in any one of the second invention to the fifth invention, according to the hot-rolled steel sheet to be inserted, the insertion speed thereof, and the heating temperature of the steel sheet,
Provided is a method for manufacturing a hot-dip coated steel sheet, characterized by controlling a flow rate of an acid solution injected onto at least one surface of a steel plate immersed in an acid solution.
【００２３】以下、本発明についてより具体的に説明す
る。一般に、熱延鋼板を脱スケール酸洗すると、部分的
にスケールが残存したり、セメンタイトを主成分とする
スマットが付着していることがあり、このような場合に
は、溶融めっきの際に、ピンホール状の不めっきを生じ
やすく、品質および歩留まりの低下を招いていた。スケ
ールは、熱間圧延時に鋼の酸化しやすい部分に優先的に
成長するため、鋼とスケールの界面は平坦な面ではな
い。このような状況で脱スケール酸洗が行われるため、
酸洗後の鋼板表面には、大きな凹凸が存在する。Hereinafter, the present invention will be described more specifically. In general, when descaling and pickling a hot-rolled steel sheet, scale may partially remain or smut containing cementite as a main component may be attached.In such a case, during hot-dip plating, Pinhole-shaped non-plating was liable to occur, resulting in lower quality and yield. Since the scale grows preferentially on the oxidizable portion of the steel during hot rolling, the interface between the steel and the scale is not a flat surface. Because descaling pickling is performed in such a situation,
There are large irregularities on the steel sheet surface after pickling.
【００２４】また、最近の脱スケール酸洗では、鋼の歩
留まりを考慮して、スケールは溶解するが、鋼は溶解さ
せないインヒビターが添加されるようになり、一層上記
の傾向を助長している。したがって、凹部の奥深い部分
では、スケールが取り残されたり、スマットが付着して
脱落しにくい傾向にある。Further, in recent descaling pickling, an inhibitor that dissolves the scale but does not dissolve the steel is added in consideration of the yield of steel, which further promotes the above tendency. Therefore, in the deep part of the concave portion, there is a tendency that the scale is left behind or the smut adheres and it is difficult to fall off.
【００２５】このような、残存スケールやスマットを除
去するために、現状では電解清浄法やブラシ研削などの
機械的除去法が採用されている。電解清浄法は、設備が
莫大で製造コストが増大するという問題があった。ブラ
シ研削などの機械的除去法では、ブラシの毛抜けにより
欠陥を生じたり、鋼板の凹凸によってブラシがあたらな
い部分が存在するなどにより、除去安定性に欠けるとい
う問題があった。In order to remove such residual scale and smut, mechanical removal methods such as electrolytic cleaning and brush grinding are currently used. The electrolytic cleaning method has a problem that the equipment is enormous and the production cost increases. The mechanical removal method such as brush grinding has a problem in that the removal stability is lacking due to a defect caused by the bristle of the brush or a portion where the brush does not hit due to unevenness of the steel plate.
【００２６】本発明者らは、脱スケール酸洗処理におい
て、安定して残存スケールやスマットを除去する方法に
ついて検討した結果、酸洗速度の上昇、および特に初期
段階での脱スケールに着目し、本発明を完成するに至っ
た。すなわち、鋼板を所定の温度に加熱し、加熱直後に
鋼板を酸液に浸漬し、浸漬された鋼板の少なくとも一方
の面に酸液を噴射することにより脱スケール酸洗処理
し、引き続き、酸洗処理が施された熱延鋼板を連続溶融
めっき装置に導入して熱延鋼板に溶融めっきを施すこと
により、安価で確実に良好なめっき品質を有する溶融め
っき鋼板を得ることができる。The present inventors have studied a method for stably removing residual scale and smut in the descaling pickling treatment. As a result, the inventors focused on an increase in the pickling rate, and in particular, descaling in the initial stage. The present invention has been completed. That is, the steel sheet is heated to a predetermined temperature, immediately after the heating, the steel sheet is immersed in an acid solution, and the acid solution is sprayed on at least one surface of the immersed steel sheet to perform a descaling pickling treatment. By introducing the treated hot-rolled steel sheet into a continuous hot-dip coating apparatus and hot-dip coating the hot-rolled steel sheet, a hot-dip coated steel sheet having good plating quality can be reliably obtained at low cost.
【００２７】本発明において、脱スケール速度の向上
は、酸液より高い温度に加熱された熱延鋼板を酸液に浸
漬する際に、鋼板と酸液との温度差により熱衝撃を生
じ、スケールと鋼板との熱膨張係数の違いから、スケー
ルが鋼板との界面から脱落する効果や、脱落しなくとも
スケール内部にクラックが発生することにより、初期段
階からスケールに損傷を与えることができる効果により
達成される。In the present invention, the descaling speed is improved by immersing a hot-rolled steel sheet heated to a temperature higher than that of the acid solution in the acid solution, causing a thermal shock due to a temperature difference between the steel sheet and the acid solution. The effect of the scale falling off from the interface with the steel sheet due to the difference in the coefficient of thermal expansion between the steel and the steel sheet, and the effect that the scale can be damaged from the initial stage by cracking inside the scale without falling off Achieved.
【００２８】また、鋼板は、酸液に浸漬された際に酸液
が沸騰する温度に加熱されることにより、酸液浸漬時に
鋼板表面には沸騰による泡が発生し（核沸騰状態）、ス
ケールの破壊を促進するとともに、酸液の流動を促進
し、溶解速度の低下を防止する。さらに、沸騰が生じて
ある程度スケールの破壊が飽和状態に達した時点で、鋼
板の少なくとも一方の面に酸液を噴射することで、沸騰
膜あるいは泡を系外に排出することができ、瞬時に酸に
よるスケールの溶解へと転換することができる。また、
加熱温度が上昇して酸液浸漬時に沸騰膜が形成される状
態（膜沸騰状態）となるような場合であっても、鋼板の
少なくとも一方の面に酸液を噴射することで、沸騰膜を
除去することができ、スケールの溶解を促進させること
ができる。なお、鋼板の加熱温度が沸騰に至らない場合
であっても、上記温度差による熱衝撃によってクラック
が発生したスケールを、その後に鋼板の少なくとも一方
の面に酸液を噴射することにより極めて迅速に除去する
ことができる。Further, the steel sheet is heated to a temperature at which the acid solution boils when immersed in the acid solution, whereby bubbles are generated on the surface of the steel plate during immersion in the acid solution (nucleate boiling state), and the scale is scaled. And promotes the flow of the acid solution to prevent the dissolution rate from decreasing. Furthermore, when boiling occurs and scale destruction reaches a saturated state to some extent, by injecting an acid solution onto at least one surface of the steel sheet, a boiling film or bubbles can be discharged out of the system, and instantaneously. Conversion to scale dissolution by acid can be achieved. Also,
Even when the heating temperature rises and a boiling film is formed during immersion in an acid solution (film boiling state), the boiling film is sprayed by injecting the acid solution onto at least one surface of the steel sheet. It can be removed and promote dissolution of the scale. Even when the heating temperature of the steel sheet does not reach boiling, the scale in which cracks are generated due to the thermal shock due to the temperature difference is extremely quickly thereafter injected by injecting an acid solution onto at least one surface of the steel sheet. Can be removed.
【００２９】従来は、十分なめっき密着性を得るため
に、連続溶融めっき装置の中で７００〜８００℃の高温
に鋼板を加熱し、還元焼鈍を行っていたが、本発明を採
用することにより、残存スケール、残存スマットが減少
したため、めっき金属の浴温度までの加熱で、十分なめ
っき密着性が得られることを知見した。また、従来は、
還元焼鈍に必要な温度および時間を確保するため、低速
での操業を余儀なくされていたが、本発明では、高速で
の操業を行っても十分なめっき密着性が得られることが
判明した。Conventionally, in order to obtain sufficient plating adhesion, a steel sheet is heated to a high temperature of 700 to 800 ° C. in a continuous hot-dip coating apparatus and reduction annealing is performed. Since the residual scale and residual smut decreased, it was found that sufficient plating adhesion could be obtained by heating the plating metal to the bath temperature. Conventionally,
In order to secure the temperature and time required for reduction annealing, operation at low speed was inevitable. However, in the present invention, it has been found that sufficient plating adhesion can be obtained even at high speed.
【００３０】しかし、その反面、高速での操業の場合に
は酸洗時間が短くなるために、脱スケール能力が低下す
ることが判明した。また、連続溶融めっき装置の特徴と
して、焼鈍炉にて鋼板を加熱する必要があり、焼鈍炉能
力の制約から、挿入される鋼板の板厚によっては鋼板の
速度が大きく変動するため、酸洗槽中に浸漬されている
時間が変化し、酸洗速度を調整する必要があった。However, on the other hand, it has been found that in the case of operation at a high speed, the descaling ability is reduced because the pickling time is short. Further, as a feature of the continuous hot-dip coating apparatus, it is necessary to heat the steel sheet in an annealing furnace, and the speed of the steel sheet greatly varies depending on the thickness of the inserted steel sheet due to the limitation of the annealing furnace capacity. The time during which it was immersed in it changed, and it was necessary to adjust the pickling rate.
【００３１】そこで、本発明者らは、上述した脱スケー
ル能力の低下を補うこと、あるいは酸洗槽中に浸漬され
る時間の変動による影響を緩和することに着目して検討
を重ねた。その結果、挿入される熱延鋼板（例えばその
板厚）、および挿入される熱延鋼板の速度に応じて熱延
鋼板の加熱温度を調整するか、あるいは、挿入される熱
延鋼板（例えばその板厚）、および挿入される熱延鋼板
の速度、および熱延鋼板の加熱温度が変化したときに
は、酸液に浸漬した後の鋼板へ噴射する酸液の流速を調
整することにより、最適な酸洗速度あるいは脱スケール
状態が得られることを知見した。Therefore, the inventors of the present invention have repeatedly studied paying attention to compensating for the above-mentioned decrease in descaling ability or reducing the influence of fluctuations in the immersion time in the pickling tank. As a result, the heating temperature of the hot-rolled steel sheet to be inserted is adjusted according to the speed of the hot-rolled steel sheet to be inserted (for example, its thickness) and the speed of the hot-rolled steel sheet to be inserted, or the hot-rolled steel sheet to be inserted (for example, Thickness), the speed of the hot-rolled steel sheet to be inserted, and the heating temperature of the hot-rolled steel sheet, the optimum acidity is adjusted by adjusting the flow rate of the acid solution injected into the steel sheet after immersion in the acid solution. It was found that the washing speed or descaling state could be obtained.
【００３２】[0032]
【発明の実施の形態】以下、本発明の実施の形態につい
て説明する。図１は、本発明の一実施形態に係る溶融め
っき設備を示す概略構成図である。この装置は、連続溶
融めっき装置１６と、その入側に配置された鋼板加熱部
１３１３と、鋼板加熱部１３および溶融めっき装置１６
の間に配置され、鋼板が浸漬される酸洗槽部１４と、酸
洗槽部１４に浸漬された鋼板の表面に酸液を噴射する酸
液噴射装置１５とを備えている。そして、連続溶融めっ
き装置１６は、焼鈍装置１７と溶融めっき槽１８とを有
している。Embodiments of the present invention will be described below. FIG. 1 is a schematic configuration diagram showing a hot-dip plating facility according to one embodiment of the present invention. This apparatus includes a continuous hot-dip coating apparatus 16, a steel sheet heating section 1313 disposed on the entrance side thereof, a steel sheet heating section 13 and a hot-dip coating apparatus 16
The pickling tank unit 14 is disposed between the pickling tank units and is immersed in the steel plate. The acid liquid spraying unit 15 sprays an acid liquid onto the surface of the steel plate immersed in the pickling tank unit 14. The continuous hot-dip plating apparatus 16 has an annealing device 17 and a hot-dip plating bath 18.
【００３３】この設備において亜鉛系金属または合金を
溶融めっきする際には、コイル１１から繰り出された熱
延鋼板１２を鋼板加熱部１３で所定温度に加熱し、加熱
直後に酸洗槽部１４に貯留された酸液に鋼板１２を浸漬
し、この酸液に浸漬された熱延鋼板１２の表面に酸液噴
射装置１５から酸液を噴射する。これにより上述したよ
うな作用に基づく脱スケール酸洗処理がなされる。そし
て、引き続き連続する連続溶融めっき装置１６により溶
融めっき処理を行う。なお、図では酸洗噴射装置１５は
熱延鋼板の両側から酸液を噴射するようになっている
が、少なくともいずれか一方を噴射するようにしてもよ
い。また、必要な面側のみに噴射部を有する装置を設け
てもよい。さらに、噴射装置を複数設けてもよい。When hot dipping a zinc-based metal or alloy in this equipment, the hot-rolled steel sheet 12 unwound from the coil 11 is heated to a predetermined temperature in the steel sheet heating section 13 and immediately after heating, the hot-rolled steel sheet 12 is transferred to the pickling tank section 14. The steel sheet 12 is immersed in the stored acid solution, and the acid solution is sprayed from the acid solution spray device 15 onto the surface of the hot-rolled steel sheet 12 immersed in the acid solution. Thereby, the descaling pickling treatment based on the above-described action is performed. Then, a hot-dip plating process is performed by a continuous continuous hot-dip plating apparatus 16. In the drawing, the pickling spraying device 15 sprays the acid solution from both sides of the hot-rolled steel sheet, but it is also possible to spray at least one of them. Further, a device having an injection unit only on a necessary surface side may be provided. Further, a plurality of injection devices may be provided.
【００３４】図２は、他の実施形態に係る溶融めっき設
備を示す概略構成図である。この設備は基本構成は図１
の装置と同じであるが、鋼板加熱部１３´に熱延鋼板１
２が垂直に挿入され、さらに酸洗槽部１４´にも垂直に
挿入され、酸洗槽部１４´の前段の垂直部に酸液噴射装
置１５´が設けられている。そして、酸洗槽部１４´の
後段において熱延鋼板１２が水平にされ、図１の装置と
同様、連続溶融めっき装置１６へと挿入される。この図
の装置の場合にも、酸洗噴射装置１５´は熱延鋼板の両
側から酸液を噴射するようになっているが、少なくとも
いずれか一方を噴射するようにしてもよい。また、必要
な面側のみに噴射部を有する装置を設けてもよい。さら
に、噴射装置を複数設けてもよい。FIG. 2 is a schematic configuration diagram showing a hot-dip plating facility according to another embodiment. The basic configuration of this equipment is shown in Fig. 1.
Is the same as that of the apparatus described above, except that the hot-rolled steel sheet 1
2 is vertically inserted, and further vertically inserted into the pickling tank section 14 ', and an acid solution spraying device 15' is provided in a vertical section in front of the pickling tank section 14 '. Then, the hot-rolled steel sheet 12 is made horizontal at the subsequent stage of the pickling tank section 14 ', and is inserted into the continuous hot-dip plating apparatus 16 as in the apparatus of FIG. Also in the case of the apparatus shown in this figure, the pickling spraying device 15 'is configured to spray the acid solution from both sides of the hot-rolled steel sheet, but it is also possible to spray at least one of them. Further, a device having an injection unit only on a necessary surface side may be provided. Further, a plurality of injection devices may be provided.
【００３５】なお、図１および図２の設備において、酸
洗槽部１４、１４´における酸洗の後処理として、水洗
槽、中和槽を設置することが望ましい。また、同様に酸
洗槽部１４、１４´の後処理としてアルカリ脱脂槽が設
置されていても同様の効果を奏することができる。In the equipment shown in FIGS. 1 and 2, it is desirable to install a water washing tank and a neutralization tank as a post-treatment for pickling in the pickling tank units 14 and 14 '. Similarly, the same effect can be obtained even if an alkaline degreasing tank is provided as a post-treatment of the pickling tank units 14 and 14 '.
【００３６】なお、本発明において、酸液噴射の目的
は、上述したように、加熱された鋼板を酸液に浸漬する
際に発生する沸騰による泡（核沸騰状態）および膜（膜
沸騰状態）を系外に排出することであり、また、脱スケ
ール能力の低下を補うことあるいは酸液に浸漬される時
間の変動による影響を緩和することである。したがっ
て、このような効果を奏することができる酸液噴射装置
および方法であればよく、図１および図２に示したよう
に酸液を鋼板に対して垂直に噴射するものに限るもので
はない。すなわち、酸液を鋼板表面に対し直角以外の角
度で噴射してもよいし、鋼板の進行方向に対し、前、後
あるいは横方向から噴射してもよい。さらに、噴射する
酸液の速度を周期的に変動させたり、噴流を乱流化させ
るなどの工夫を行ってもよい。In the present invention, as described above, the purpose of the acid solution injection is to generate bubbles (nucleate boiling state) and films (film boiling state) due to boiling generated when the heated steel sheet is immersed in the acid solution. Is to discharge out of the system, to compensate for the decrease in descaling ability, or to reduce the effect of fluctuation in the time of immersion in the acid solution. Therefore, any acid solution spraying apparatus and method capable of achieving such an effect may be used, and the invention is not limited to an acid solution spraying device perpendicularly to a steel sheet as shown in FIGS. 1 and 2. That is, the acid solution may be sprayed at an angle other than a right angle to the surface of the steel sheet, or may be sprayed before, after, or laterally with respect to the traveling direction of the steel sheet. Further, a device such as periodically changing the speed of the acid solution to be injected or making the jet flow turbulent may be used.
【００３７】[0037]
（実施例１）本発明の効果を確認するために、連続式溶
融めっきラインで製造実験を行った。その実機試験条件
を表１、表２に示す。ここでは、めっき母材には通常の
低炭素Ａｌキルド鋼板を使用した。板厚は１．６ｍｍで
ある。めっき浴組成はＡｌが０．１６ｗｔ％で残部Ｚｎ
であり、めっき浴温４６５℃、侵入板温４７５℃、めっ
き付着量は両面で１５０ｇ／ｍ2 以上とした。表１、表
２に記載されていない製造条件は、連続式溶融めっきラ
インにて同等材を通板するときの標準的なものとした。(Example 1) In order to confirm the effect of the present invention, a production experiment was conducted on a continuous hot-dip plating line. The actual machine test conditions are shown in Tables 1 and 2. Here, a normal low-carbon Al-killed steel sheet was used as the plating base material. The plate thickness is 1.6 mm. The plating bath composition was 0.16 wt% Al and the balance was Zn
The plating bath temperature was 465 ° C., the penetration plate temperature was 475 ° C., and the coating weight was 150 g / m 2 or more on both sides. The production conditions not described in Tables 1 and 2 were standard conditions for passing equivalent materials through a continuous hot-dip plating line.
【００３８】酸洗は、塩酸１００ｇ／Ｌ、塩化第１鉄２
５０ｇ／Ｌ、塩化第２鉄５ｇ／Ｌ、インヒビターとして
ヒビロンＡ−５を３ｇ／Ｌを含む酸液を用い、液温８５
℃で行った。鋼板の加熱は、熱延コイルを常温まで冷却
した後、加熱部のインダクションヒーターにより行い、
所定温度まで加熱した。なお、表１のＮｏ．１〜２０は
本発明の酸液噴射を行っていない比較例であり、また、
表２のＮｏ．２１〜２３は酸液噴射を行っているものの
鋼板加熱が不十分な比較例であり、表２のＮｏ．２４〜
４０は本発明例である。For pickling, hydrochloric acid 100 g / L, ferrous chloride 2
Using an acid solution containing 50 g / L, ferric chloride 5 g / L, and Hibiron A-5 3 g / L as an inhibitor, and a liquid temperature of 85
C. was performed. After heating the hot-rolled coil to room temperature, the steel sheet is heated by the induction heater in the heating section.
Heated to a predetermined temperature. Note that, in Table 1, No. 1 to 20 are comparative examples in which the acid solution injection of the present invention was not performed, and
No. of Table 2 Nos. 21 to 23 are comparative examples in which the acid solution was injected but the heating of the steel sheet was insufficient, and 24 ~
Reference numeral 40 denotes an example of the present invention.
【００３９】これらの実験材に対して、めっき後に２ｔ
曲げを行い、曲げ部外側のテープ剥離を行ってめっき密
着性を評価した。ここでは皮膜が剥離しなかったものを
○、剥離したものを×とした。また、目視観察により、
不めっきの程度を評価した。ここでは不めっきが不めっ
きがなかったものを○、不めっきが存在し、それが少な
かったものを△、多かったものを×とした。これらの結
果も表１、表２に併記する。また、その結果を図４に示
す。For these experimental materials, 2 t
Bending was performed, and the tape was peeled from the outside of the bent portion to evaluate the plating adhesion. Here, 皮膜 indicates that the film did not peel, and X indicates that it did. Also, by visual observation,
The degree of unplating was evaluated. Here, ○ indicates that there was no non-plating, Δ indicates that there was non-plating and the number of non-plating was small, and X indicates that the number was large. These results are also shown in Tables 1 and 2. FIG. 4 shows the results.
【００４０】[0040]
【表１】 [Table 1]
【００４１】[0041]
【表２】 [Table 2]
【００４２】表１、表２および図４から明らかなよう
に、比較例は酸洗時間が長くかかっているため、実験に
使用したＣＧＬの能力の最大（焼鈍温度を７５０℃とす
るために必要な能力。板厚×最大ラインスピード＝１２
０で計算される。したがって、板厚１．６ｍｍの場合に
は最大ラインスピードは７５ｍｐｍとなる。）である７
５ｍｐｍ以下の速度で生産せざるを得ず、非能率であ
る。一方、本発明のように鋼板加熱と噴流とを組み合わ
せた場合には、酸洗時間が短く、ラインスピード最大能
力の７５ｍｐｍで生産することができ、生産性が向上し
た。また、従来３００℃以上に加熱した場合には、鋼板
表面が沸騰膜で覆われるため、酸洗時間が逆に長くなる
現象を生じていたが、本発明の噴流の効果により、沸騰
膜を系外に排出し、鋼板表面が酸液と接触するようにな
るため、酸洗時間が短くなる。４５０℃以上では鋼板の
形状が悪くなる弊害があるが、形状を気にしない用途に
は十分使用することができる。ただし、形状の点も考慮
して、鋼板加熱は４００℃以下にすることが望ましい。
なお、本実施例では焼鈍温度を７５０℃としているた
め、いずれのサンプルとも十分なめっき密着性が得られ
て、不めっきは発生していない。As is clear from Tables 1 and 2 and FIG. 4, since the pickling time was long in the comparative example, the maximum capacity of the CGL used in the experiment (necessary for setting the annealing temperature to 750 ° C.) Ability x thickness x maximum line speed = 12
Calculated as 0. Therefore, when the plate thickness is 1.6 mm, the maximum line speed is 75 mpm. 7)
It must be produced at a speed of 5 mpm or less, which is inefficient. On the other hand, when the steel sheet heating and the jet flow were combined as in the present invention, the pickling time was short, the production was possible at the maximum line speed of 75 mpm, and the productivity was improved. Conventionally, when heated to 300 ° C. or more, the surface of the steel sheet is covered with a boiling film, which has caused a phenomenon that the pickling time is prolonged in reverse. Since the steel sheet is discharged to the outside and the surface of the steel sheet comes into contact with the acid solution, the pickling time is shortened. If the temperature is 450 ° C. or higher, the shape of the steel sheet is adversely affected, but it can be used sufficiently for applications that do not care about the shape. However, in consideration of the shape, the heating of the steel sheet is desirably 400 ° C. or less.
In this example, since the annealing temperature was 750 ° C., sufficient plating adhesion was obtained with any of the samples, and no plating occurred.
【００４３】（実施例２）次に、同様の実験を焼鈍温度
５００℃にて実施した。焼鈍温度を７５０℃から５００
℃に低下させると、炉能力が見かけ上１．５倍に増加し
たこととなる。すなわち、炉能力は板厚×最大ラインス
ピード＝１８０で計算される。したがって、板厚１．６
ｍｍの時の最大ラインスピードは１１２．５ｍｐｍとな
る。(Example 2) Next, a similar experiment was performed at an annealing temperature of 500 ° C. Annealing temperature from 750 ℃ to 500
When the temperature was lowered to ° C., the furnace capacity apparently increased 1.5 times. That is, the furnace capacity is calculated by the following equation: sheet thickness × maximum line speed = 180. Therefore, the sheet thickness is 1.6.
The maximum line speed at the time of mm is 112.5 mpm.
【００４４】表３、表４に実験結果を示した。表３のＮ
ｏ．４１〜６０は酸液噴射を実施しない比較例であり、
表３のＮｏ．６１〜６３は酸液噴射を行っているものの
鋼板加熱が不十分な比較例であり、Ｎｏ．６４〜８０は
本発明例である。Tables 3 and 4 show the experimental results. N in Table 3
o. 41 to 60 are comparative examples in which the acid solution injection is not performed,
No. 3 in Table 3. Nos. 61 to 63 are comparative examples in which the acid solution was injected but the steel sheet was not sufficiently heated. 64 to 80 are examples of the present invention.
【００４５】焼鈍温度を低下させることにより、炉能力
的にはラインスピードを上げて操業可能であるが、比較
例では酸洗に時間を要し、酸洗に制約された速度での操
業となり、能率が低下するものの、わずかにスマット状
の不純物が残っているため、５００℃の低温還元焼鈍で
は十分なめっき密着性を得ることはできず、不めっきも
発生した。一方、本発明例では、酸洗時間が短時間化さ
れることにより、ラインスピードが増加し、生産能率が
向上した。さらに、鋼板加熱および酸液噴流の効果によ
りデスケーリングが完全に達成されるため、５００℃の
低温焼鈍でも、良好な密着性が得られ、不めっきは発生
しない。By lowering the annealing temperature, it is possible to operate the furnace at a higher line speed in terms of furnace capacity, but in the comparative example, it takes time for pickling, and the operation is performed at a speed restricted by pickling. Although the efficiency was reduced, a slight smut-like impurity remained, so that low-temperature reduction annealing at 500 ° C. could not obtain sufficient plating adhesion, and non-plating also occurred. On the other hand, in the present invention example, the line speed was increased and the production efficiency was improved by shortening the pickling time. Furthermore, since descaling is completely achieved by the effects of the heating of the steel sheet and the jetting of the acid solution, good adhesion can be obtained even at low temperature annealing at 500 ° C., and no plating does not occur.
【００４６】[0046]
【表３】 [Table 3]
【００４７】[0047]
【表４】 [Table 4]
【００４８】なお、上記実施例１および実施例２では、
塩酸を用いた酸洗実験を行ったが、硫酸など他の酸液を
用いても同様の効果が得られる。また、噴流速度は、沸
騰膜を系外に排出能力があればよい。例えば、０．５〜
３．０ｍ／ｓｅｃ程度の噴流速度で可能である。In the first and second embodiments,
Although the pickling experiment using hydrochloric acid was performed, the same effect can be obtained by using another acid solution such as sulfuric acid. The jet velocity may be any as long as the boiling film can be discharged outside the system. For example, 0.5-
It is possible with a jet velocity of about 3.0 m / sec.
【００４９】[0049]
【発明の効果】以上に示したように、本発明によれば、
通常行われる熱延鋼板の脱スケール酸洗工程を連続式溶
融めっきラインに組み込んで、生産コストを低減すると
共に、従来から問題となっていた、酸洗後のスマット除
去の問題、還元焼鈍時の加熱温度低減の問題を一挙に解
決し、操業コスト・設備コストを低減し、連続式溶融め
っき設備において安価でめっき密着性に優れた溶融めっ
き鋼板を製造することが可能になる。As described above, according to the present invention,
Incorporating the usual descaling pickling process of hot-rolled steel sheets into a continuous hot-dip plating line to reduce production costs and the problem of removing smut after pickling, which has been a problem in the past, during reduction annealing The problem of reducing the heating temperature can be solved all at once, the operating cost and equipment cost can be reduced, and it is possible to manufacture a hot-dip coated steel sheet that is inexpensive and has excellent plating adhesion in a continuous hot-dip coating equipment.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明の実施の形態に係る溶融めっき設備を示
す概略構成図。FIG. 1 is a schematic configuration diagram showing a hot-dip plating facility according to an embodiment of the present invention.
【図２】本発明の他の実施の形態に係る溶融めっき設備
を示す概略構成図。FIG. 2 is a schematic configuration diagram showing a hot-dip plating facility according to another embodiment of the present invention.
【図３】従来の溶融めっき設備を示す概略構成図。FIG. 3 is a schematic configuration diagram showing a conventional hot-dip plating facility.
【図４】実施例１の実験結果を示す図。FIG. 4 is a diagram showing experimental results of Example 1.
１１……コイル １２……熱延鋼板 １３，１３´……鋼板加熱部 １４，１４´……酸洗槽部 １５，１５´……酸液噴射装置 １６……連続溶融めっき装置 １７……焼鈍炉 １８……めっき槽 11 ... Coil 12 ... Hot rolled steel plate 13,13 '... Steel plate heating unit 14,14' ... Pickling tank unit 15,15 '... Acid solution injection device 16 ... Continuous hot-dip plating device 17 ... Annealing Furnace 18 ... Plating tank
───────────────────────────────────────────────────── フロントページの続き (72)発明者 藤田 賢哉 東京都千代田区丸の内一丁目１番２号 日本鋼管株式会社内 (72)発明者 味野 圭介 東京都千代田区丸の内一丁目１番２号 日本鋼管株式会社内 (72)発明者 永山 隆治 東京都千代田区丸の内一丁目１番２号 日本鋼管株式会社内 (56)参考文献 特開 平５−295511（ＪＰ，Ａ) 特開 平６−55213（ＪＰ，Ａ) 特開 平９−3673（ＪＰ，Ａ) 特開 平３−100189（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C23C 2/00 - 2/40 C23G 3/02 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kenya Fujita 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (72) Inventor Keisuke Ajino 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Inside of Kokan Co., Ltd. (72) Inventor Ryuji Nagayama 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Kokan Co., Ltd. (56) References JP-A-5-295511 (JP, A) JP-A-6-55213 ( JP, A) JP-A-9-3673 (JP, A) JP-A-3-100189 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C23C 2/00-2/40 C23G 3/02
Claims (6)
された鋼板を加熱する鋼板加熱部と、鋼板加熱部と前記
めっき装置との間に設けられた、鋼板が浸漬される酸洗
槽部と、前記酸洗槽部に浸漬された鋼板の少なくとも一
方の面に酸液を噴射する酸液噴射装置とを具備すること
を特徴とする、熱延鋼板の溶融めっき設備。1. A continuous hot-dip galvanizing apparatus, a steel sheet heating section for heating a steel sheet disposed on an entrance side thereof, and a pickling tank provided between the steel sheet heating section and the plating apparatus, wherein the steel sheet is immersed. A hot-rolled steel sheet hot-dip steel plate, comprising: a hot-rolled steel sheet; and an acid solution spraying device for spraying an acid solution onto at least one surface of the steel sheet immersed in the pickling tank.
融めっきして溶融めっき鋼板を製造する方法であって、
熱延鋼板を酸液よりも高い温度に加熱し、加熱直後に鋼
板を酸液に浸漬し、浸漬された鋼板の少なくとも一方の
面に酸液を噴射することにより脱スケール酸洗処理し、
引き続き、前記処理が施された熱延鋼板を連続溶融めっ
き装置に導入して該熱延鋼板に溶融めっきを施すことを
特徴とする、溶融めっき鋼板の製造方法。2. A method for producing a hot-dip coated steel sheet by hot-dip coating a zinc-based metal or alloy on a hot-rolled steel sheet,
The hot-rolled steel sheet is heated to a temperature higher than the acid solution, the steel sheet is immersed in the acid solution immediately after the heating, and subjected to a descaling pickling treatment by spraying the acid solution on at least one surface of the immersed steel sheet,
Subsequently, the hot-rolled steel sheet that has been subjected to the treatment is introduced into a continuous hot-dip coating apparatus, and hot-rolled steel sheet is hot-dip-coated.
液に浸漬された時に酸液が核沸騰状態になる温度域まで
鋼板を加熱し、加熱直後に鋼板を酸液に浸漬し、所定の
時間経過後、浸漬された鋼板の少なくとも一方の面に酸
液を噴射することを特徴とする、請求項２に記載の溶融
めっき鋼板の製造方法。3. When heating the hot-rolled steel sheet, the steel sheet is heated to a temperature range in which the acid solution is brought into a nucleate boiling state when the steel sheet is immersed in the acid solution. 3. The method according to claim 2, wherein an acid solution is injected onto at least one surface of the immersed steel sheet after the elapse of the time.
液に浸漬された時に酸液が膜沸騰状態になる温度域まで
鋼板を加熱し、加熱直後に鋼板を酸液に浸漬し、所定の
時間経過後、浸漬された鋼板の少なくとも一方の面に酸
液を噴射することを特徴とする、請求項２に記載の溶融
めっき鋼板の製造方法。4. When heating the hot-rolled steel sheet, the steel sheet is heated to a temperature range in which the acid solution becomes a film boiling state when the steel sheet is immersed in the acid solution, and immediately after the heating, the steel sheet is immersed in the acid solution. 3. The method according to claim 2, wherein an acid solution is injected onto at least one surface of the immersed steel sheet after the elapse of the time.
に応じて、鋼板の加熱温度を制御することを特徴とす
る、請求項２ないし請求項４のいずれか１項に記載の溶
融めっき鋼板の製造方法。5. The hot-dip coated steel sheet according to claim 2, wherein a heating temperature of the steel sheet is controlled in accordance with a hot-rolled steel sheet to be inserted and an insertion speed thereof. Manufacturing method.
度、ならびに鋼板の加熱温度に応じて、酸液に浸漬され
た鋼板の少なくとも一方の面に噴射される酸液の流速を
制御することを特徴とする、請求項２ないし請求項５の
いずれか１項に記載の溶融めっき鋼板の製造方法。6. A method for controlling a flow rate of an acid solution sprayed on at least one surface of a steel plate immersed in an acid solution according to a hot-rolled steel sheet to be inserted, an insertion speed thereof, and a heating temperature of the steel sheet. The method for producing a hot-dip coated steel sheet according to any one of claims 2 to 5, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05542797A JP3219010B2 (en) | 1997-02-25 | 1997-02-25 | Hot-rolled steel sheet hot dip coating equipment and hot-dip coated steel sheet manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05542797A JP3219010B2 (en) | 1997-02-25 | 1997-02-25 | Hot-rolled steel sheet hot dip coating equipment and hot-dip coated steel sheet manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10237612A JPH10237612A (en) | 1998-09-08 |
| JP3219010B2 true JP3219010B2 (en) | 2001-10-15 |
Family
ID=12998293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05542797A Expired - Fee Related JP3219010B2 (en) | 1997-02-25 | 1997-02-25 | Hot-rolled steel sheet hot dip coating equipment and hot-dip coated steel sheet manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3219010B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4656171B2 (en) * | 2008-03-28 | 2011-03-23 | Ｊｆｅスチール株式会社 | Method for producing alloyed hot-dip galvanized steel sheet |
| CN106011900B (en) * | 2016-05-26 | 2018-10-19 | 江苏兴隆防腐设备有限公司 | A kind of device for carrying out pickling to wire rod |
-
1997
- 1997-02-25 JP JP05542797A patent/JP3219010B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10237612A (en) | 1998-09-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3219010B2 (en) | Hot-rolled steel sheet hot dip coating equipment and hot-dip coated steel sheet manufacturing method | |
| JP4619404B2 (en) | Hot-rolled steel sheet manufacturing method | |
| JPS6056418B2 (en) | Manufacturing method of hot-dip galvanized steel sheet | |
| JPH10330900A (en) | Hot dip plating method for hot rolled steel sheet | |
| JP3514837B2 (en) | Hot-dip galvanizing method | |
| JPS61147900A (en) | Method and installation for continuous electroplating of steel strip | |
| JPH06116653A (en) | Production of low cost type hot rolled and hot dip plated steel strip excellent in plating surface property and plating adhesion and device therefor | |
| JPH11200003A (en) | Production of hot-rolled base galvanized steel sheet and galvannealed steel sheet | |
| JPH02258962A (en) | Equipment for producing galvanizing steel sheet having excellent weldability | |
| JP3704893B2 (en) | Steel plate pickling apparatus and pickling method, and steel sheet hot-dip plating apparatus and hot dipping method | |
| JPH11209860A (en) | Production of hot rolled steel sheet under coated with hot dip galveniizing | |
| JPH10140311A (en) | Method of hot dip plating for hot rolled steel sheet and hot dip plating equipment | |
| JPH10140312A (en) | Method of hot dip plating for hot rolled steel sheet and hot dip plating equipment | |
| JPH10130801A (en) | Production of hot-dip plated steel sheet excellent in surface quality | |
| KR100848622B1 (en) | METHOD FOR MANUFACTURING NICKEL-Flash TREATED STEEL SHEET HAVING GOOD CORROSION RESISTANCE AND SURFACE TREATMENT CHARACTERISTICS | |
| JPH09217160A (en) | Production of galvanized steel sheet | |
| JPH07197225A (en) | Hot-dip metal plating method of high tensile strength hot-rolled steel sheet | |
| SU1303623A1 (en) | Method for producing thin high-strength steel strip with iron-zinc alloy coating | |
| JP3248432B2 (en) | Manufacturing method of hot-dip coated steel sheet | |
| JP3533177B2 (en) | Method for producing hot-dip Al-Zn-based plated steel sheet | |
| JPH10330899A (en) | Hot dip plating method for hot rolled steel sheet and device therefor | |
| JPH09324249A (en) | Hot dip metal plating device and production of hot dip metal plated hot rolled steel strip | |
| JP3002931B2 (en) | Method and apparatus for producing hot-rolled hot-dip galvanized steel strip having excellent plating surface properties and plating adhesion | |
| JP2002047546A (en) | Facility for producing hot dip galvanized steel sheet | |
| JPH0971850A (en) | Production of hot dip coated steel sheet having excellent surface quality |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070810 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080810 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080810 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090810 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090810 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100810 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110810 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120810 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120810 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130810 Year of fee payment: 12 |
|
| LAPS | Cancellation because of no payment of annual fees |