JP5668406B2 - Continuous annealing equipment for thin steel sheet - Google Patents

Continuous annealing equipment for thin steel sheet Download PDF

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JP5668406B2
JP5668406B2 JP2010234230A JP2010234230A JP5668406B2 JP 5668406 B2 JP5668406 B2 JP 5668406B2 JP 2010234230 A JP2010234230 A JP 2010234230A JP 2010234230 A JP2010234230 A JP 2010234230A JP 5668406 B2 JP5668406 B2 JP 5668406B2
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continuous annealing
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furnace
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JP2012087355A (en
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日野 善道
善道 日野
竹林 克浩
克浩 竹林
植野 雅康
雅康 植野
広和 杉原
広和 杉原
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JFE Steel Corp
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Description

本発明は、薄鋼板の連続焼鈍設備に関し、具体的には0.5mm以下の薄鋼板を、高温長時間焼鈍するのに適した連続焼鈍設備に関するものである。   The present invention relates to a continuous annealing facility for thin steel sheets, and more particularly to a continuous annealing facility suitable for annealing a steel sheet having a thickness of 0.5 mm or less at a high temperature for a long time.

冷間圧延した薄鋼板を焼鈍する方法としては、雰囲気ガスを調整したインナーカバーの内部に鋼板をコイルの状態にして載置し、その外側に箱型の炉を被せて焼鈍するバッチ式の箱型焼鈍(ボックス焼鈍、バッチ焼鈍)と、コイルを巻き戻しながら鋼板を雰囲気と温度を制御した炉内を通板して焼鈍する連続焼鈍がある。箱型焼鈍は、大きな鉄の塊(コイル)を外部から加熱し、冷却する方法であるため、コイル内の温度が不均一で、焼鈍時間も長く生産性が低いという問題がある。また、コイル状態では鋼板が焼き付きを起こしやすいため、高温焼鈍する場合には、焼鈍分離剤を塗布する必要があるという問題もある。これに対して、連続焼鈍は、コイルを巻き戻しつつ鋼板の状態で熱処理を施すため、温度が均一で、焼鈍所要時間も短く、生産性に優れるという特長がある。そのため、近年では薄鋼板の焼鈍には、連続焼鈍法が主に採用されている。   As a method of annealing a cold-rolled thin steel plate, a batch type box in which a steel plate is placed in a coil state inside an inner cover with adjusted atmospheric gas, and a box-type furnace is placed on the outer side to anneal it. There are mold annealing (box annealing, batch annealing) and continuous annealing in which the steel sheet is passed through a furnace in which the atmosphere and temperature are controlled while rewinding the coil. Box-type annealing is a method in which a large iron lump (coil) is heated and cooled from the outside, and therefore there is a problem that the temperature in the coil is uneven, the annealing time is long, and the productivity is low. Further, since the steel sheet is likely to be seized in a coil state, there is a problem that it is necessary to apply an annealing separator when performing high temperature annealing. In contrast, continuous annealing is characterized in that the temperature is uniform, the time required for annealing is short, and the productivity is excellent because heat treatment is performed in the state of a steel sheet while rewinding the coil. For this reason, in recent years, the continuous annealing method has been mainly employed for annealing thin steel sheets.

薄鋼板を連続焼鈍する設備としては、連続溶融亜鉛めっき鋼板や合金化溶融亜鉛メッキ鋼板の原板を焼鈍するのに用いられている、鋼板を水平方向に移動させながら焼鈍する横型の連続焼鈍設備と、ブリキ用原板や一般冷延鋼板、高強度冷延鋼板、ステンレス鋼板の焼鈍等に用いられている縦型の連続焼鈍設備が一般的である。
ここで、上記横型の連続焼鈍設備は、通常、コイルから巻き戻した鋼板を炉内に導入し、炉内に設置されたハースロール上を一方向に通板させながら熱処理するものであるため、炉長の関係から、比較的低温で短時間の焼鈍にしか適用できない。一方、縦型の連続焼鈍設備は、コイルから巻き戻した鋼板を、炉内の上方と下方に対向して配設されたハースロールを介して方向を反転し、上下方向に往復運動させながら熱処理を施すものであるため、炉内に大量の鋼板を蓄えることができ、その分、焼鈍時間も長く確保することができる。したがって、現今では、縦型の連続焼鈍設備が主流である(例えば、非特許文献1参照。)。
As equipment for continuous annealing of thin steel sheets, it is used for annealing continuous hot-dip galvanized steel sheets and alloyed hot-dip galvanized steel sheets, horizontal continuous annealing equipment that anneals steel sheets while moving them horizontally. In general, vertical continuous annealing equipment used for annealing tin plates, general cold-rolled steel sheets, high-strength cold-rolled steel sheets, stainless steel sheets, and the like is common.
Here, the horizontal continuous annealing equipment is usually a steel plate unwound from the coil is introduced into the furnace and heat-treated while passing in one direction on the hearth roll installed in the furnace, Because of furnace length, it can be applied only to annealing at a relatively low temperature for a short time. On the other hand, the vertical continuous annealing equipment is a heat treatment while reversing the direction of the steel sheet unwound from the coil through a hearth roll disposed facing the upper and lower sides in the furnace and reciprocating up and down. Therefore, a large amount of steel sheets can be stored in the furnace, and a long annealing time can be secured accordingly. Therefore, at present, vertical continuous annealing equipment is the mainstream (for example, see Non-Patent Document 1).

しかしながら、縦型の連続焼鈍では、鋼板の走行安定性を確保するため、通常、炉内の鋼板には一定の張力を付与しつつ通板しているが、板厚が薄くなったり、板幅が広くなったりすると、ヒートバックルや蛇行を起こして、安定して鋼板を通板することが難しくなる。また、高温焼鈍では、鋼板の強度が低下することから、上記傾向はさらに強まる。さらに、縦型の連続熱処理では、上方のハースロール近傍の鋼板には、上記付与された張力に、鋼板の自重による引張応力も加わることになる。
そのため、例えば、板厚0.5mm以下の鋼板を750℃以上の高温で焼鈍を行うような場合には、鋼板が炉内で破断を起こし易く、特に、溶接部などのように、鋼板自体の材質や板厚、板幅が大きく変化する個所ではより破断を起こしやすい。
However, in the vertical continuous annealing, in order to ensure the running stability of the steel plate, the steel plate in the furnace is usually passed through with a certain tension applied, but the plate thickness is reduced or the plate width is reduced. If the width of the steel plate increases, it becomes difficult to pass the steel plate stably by causing a heat buckle or meandering. Moreover, in the high temperature annealing, the strength of the steel sheet is reduced, and thus the above tendency is further increased. Furthermore, in the vertical continuous heat treatment, a tensile stress due to the weight of the steel sheet is applied to the steel sheet near the upper hearth roll in addition to the applied tension.
Therefore, for example, when a steel plate having a thickness of 0.5 mm or less is annealed at a high temperature of 750 ° C. or higher, the steel plate is likely to break in the furnace, Fracture is more likely to occur at locations where the material, thickness, and width change greatly.

上記溶接部の破断問題に対しては、例えば、特許文献1には、竪型熱処理炉において、溶接部の張力制御を行う方法が開示されている。   For example, Patent Document 1 discloses a method for controlling the tension of a welded part in a vertical heat treatment furnace with respect to the problem of fracture of the welded part.

特開平11−279660号公報JP-A-11-279660

「熱処理技術便覧」、日刊工業新聞社、2000年8月30日発行,p.764〜765.“Heat Treatment Technology Handbook”, published by Nikkan Kogyo Shimbun, August 30, 2000, p. 764-765.

しかしながら、特許文献1の技術は、ステンレスの光輝焼鈍などに用いられる竪型の熱処理炉の技術であり、鋼板が炉内を何往復もする連続焼鈍設備に適用するには無理がある。また、鋼板の炉内での破断は溶接部に限って起こるわけではないため、高温長時間焼鈍でも破断を起こし難い焼鈍設備の開発が望まれている。   However, the technique of Patent Document 1 is a vertical heat treatment furnace technique used for bright annealing of stainless steel, and is impossible to apply to a continuous annealing facility in which a steel sheet is reciprocated many times in the furnace. Moreover, since the breakage of the steel sheet in the furnace does not occur only in the welded part, development of an annealing facility that does not easily break even at high temperature and long time annealing is desired.

本発明は、従来技術が抱える上記問題点に鑑みてなされたものであり、その目的は、0.5mm以下の薄鋼板に高温長時間の焼鈍を施しても炉内破断を起こし難い新規な連続焼鈍設備を提供することにある。   The present invention has been made in view of the above-mentioned problems of the prior art, and the purpose thereof is a novel continuous process that is less likely to cause in-furnace breakage even when a high-temperature long-time annealing is performed on a thin steel sheet of 0.5 mm or less. It is to provide annealing equipment.

発明者らは、上記課題を解決するべく鋭意検討を重ねた。その結果、炉内に配設されている鋼板の通板方向を反転させるためのハースロール(以降、「反転ロール」と称する。)を、従来の縦型炉のように上下に対向して配設するのではなく、水平方向に対向して配設することで、鋼板の自重による張力増大を軽減するとともに、上記反転ロールの軸心を鋼板の進行方向に直交する方向よりずらして配設することで、対向する反転ロールの周囲を鋼板が螺旋状に移動するようにすれば、炉内に大量の鋼板を蓄えることができるので、炉内破断を起こすことなく、高温長時間の焼鈍を施すことが可能となることに想到し、本発明を完成させた。   The inventors have intensively studied to solve the above problems. As a result, hearth rolls (hereinafter referred to as “reversing rolls”) for reversing the sheet passing direction of the steel plates disposed in the furnace are arranged opposite to each other like a conventional vertical furnace. It is not provided, but it is arranged opposite to the horizontal direction to reduce an increase in tension due to its own weight, and the axis of the reversing roll is arranged to be shifted from the direction orthogonal to the traveling direction of the steel plate. Therefore, if the steel plates move spirally around the opposite reversing rolls, a large amount of steel plates can be stored in the furnace, so that high temperature and long time annealing is performed without causing in-furnace breakage. As a result, the present invention has been completed.

すなわち、本発明は、薄鋼板を、炉内に対向して配設された反転ロールに巻きつけて進行方向を反転し、炉内を往復させながら焼鈍を施す連続焼鈍設備において、上記反転ロールは、水平方向に対向し、かつ、ロール軸心が鋼板進行方向に直交する方向より一定方向にずれて配設されてなり、750℃以上の温度で10分以上の均熱処理が可能であることを特徴とする薄鋼板用連続焼鈍設備である。 That is, the present invention relates to a continuous annealing facility in which a thin steel plate is wound around a reversing roll disposed opposite to the inside of the furnace to reverse the traveling direction, and annealing is performed while reciprocating in the furnace. It is opposed to the horizontal direction, and the roll axis is disposed in a fixed direction from the direction perpendicular to the traveling direction of the steel sheet, and soaking at a temperature of 750 ° C. or higher for 10 minutes or more is possible. This is a continuous annealing facility for thin steel sheets.

本発明の薄鋼板用連続焼鈍設備は、上記直交方向からのずれ角が2〜10°であることを特徴とする。   The continuous annealing equipment for thin steel sheets of the present invention is characterized in that the deviation angle from the orthogonal direction is 2 to 10 °.

また、本発明の薄鋼板用連続焼鈍設備は、上記対をなす反転ロール間に鋼板支持ロールが配設されてなることを特徴とする。   Moreover, the continuous annealing equipment for thin steel plates of the present invention is characterized in that a steel plate support roll is disposed between the pair of reversing rolls.

また、本発明の薄鋼板用連続焼鈍設備は、上記反転ロールの外周に、鋼板を軸方向に移動させるスライド機構を設けてなることを特徴とする。   Moreover, the continuous annealing equipment for thin steel plates of the present invention is characterized in that a slide mechanism for moving the steel plates in the axial direction is provided on the outer periphery of the reversing roll.

また、本発明の薄鋼板用連続焼鈍設備は、上記反転ロールのロール径が600mmφ以上であることを特徴とする。   Moreover, the continuous annealing equipment for thin steel plates of this invention is characterized by the roll diameter of the said inversion roll being 600 mm (phi) or more.

また、本発明の薄鋼板用連続焼鈍設備が対象とする上記薄鋼板は、板厚が0.5mm以下のものであることを特徴とする。   Moreover, the said thin steel plate made into the object for the continuous annealing equipment for thin steel plates of this invention is a thing with a board thickness of 0.5 mm or less.

本発明によれば、鋼板を水平方向に対向配置した反転ロール間を往復移送させるとともに、反転ロールの軸心を鋼板の進行方向の直交方向とずらすことで、上記対向する反転ロールの周囲を鋼板が螺旋状に移動するようにしたので、0.5mm以下の薄鋼板でも、炉内破断を起こすことなく高温長時間の焼鈍を施すことが可能となる。   According to the present invention, a steel plate is reciprocally moved between reversing rolls arranged opposite to each other in the horizontal direction, and the axis of the reversing roll is shifted from a direction orthogonal to the traveling direction of the steel plate, so that the periphery of the opposed reversing rolls Is moved spirally, so that even a thin steel sheet of 0.5 mm or less can be annealed at a high temperature for a long time without causing in-furnace breakage.

本発明の連続焼鈍炉の概要を説明する図である。It is a figure explaining the outline | summary of the continuous annealing furnace of this invention. 反転ロール軸心と鋼板進行方向の直交方向とのずれ角を説明する図である。It is a figure explaining the shift | offset | difference angle of an inversion roll axis and the orthogonal direction of the steel plate advancing direction. ずれ角により反転ロールの回転に伴って鋼板が板幅方向に移動することを説明する図である。It is a figure explaining that a steel plate moves to a board width direction with rotation of a reversing roll by a gap angle. 本発明の反転ロールの外周に設けられたスライド機構を説明する図である。It is a figure explaining the slide mechanism provided in the outer periphery of the inversion roll of this invention.

図1は、本発明の連続焼鈍設備の概要を説明する模式図であり、(a)は平面図を、(b)は側面図を示したものである。連続焼鈍設備入側のペイオフリールでコイル1から巻き戻された鋼板2は、焼鈍炉3内に導入され、炉内に水平方向に対向して配設された反転ロール4aによって進行方向を反転され、反転ロール4aに対向する反転ロール4b方向に進行し、反転ロール4bによってまた進行方向を反転されて反転ロール4aの方向に進行する。その後、この反転を繰り返して所定の焼鈍が終了した鋼板は、炉外に取り出されて、設備出側のテンションリールでコイル5に巻き取られる。   FIG. 1 is a schematic diagram for explaining the outline of the continuous annealing equipment of the present invention, wherein (a) shows a plan view and (b) shows a side view. The steel plate 2 unwound from the coil 1 by the payoff reel on the entry side of the continuous annealing equipment is introduced into the annealing furnace 3 and the traveling direction is reversed by a reversing roll 4a disposed in the furnace facing the horizontal direction. The reversing roll 4a faces the reversing roll 4b, and the reversing roll 4b reverses the traveling direction again to proceed to the reversing roll 4a. Thereafter, the steel sheet that has been subjected to the reversal and has been subjected to the predetermined annealing is taken out of the furnace and wound around the coil 5 by the tension reel on the equipment exit side.

ところで、従来の縦型の連続焼鈍炉では、鋼板の進行方向と反転ロールの軸心方向は直交しているため、図1の平面図上では同じ位置を往復することになる。しかし、本発明の連続焼鈍炉では、反転ロールの軸心が、鋼板の進行方向と直交する方向から一定方向にずらして配設されている。このずれた角度を、以降、「ずれ角」という(図2参照)。そのため、本発明の連続焼鈍設備では、反転ロールによって反転された鋼板は、反転されるたびに鋼板の板幅方向(反転ロール軸心方向)に変位し、反転ロール4aおよび4bの周囲を螺旋状に往復するように移動することになる。   By the way, in the conventional vertical continuous annealing furnace, since the advancing direction of a steel plate and the axial center direction of a reversing roll are orthogonal, it will reciprocate the same position on the top view of FIG. However, in the continuous annealing furnace of the present invention, the axis of the reversing roll is arranged in a fixed direction from a direction orthogonal to the traveling direction of the steel sheet. This shifted angle is hereinafter referred to as “shift angle” (see FIG. 2). Therefore, in the continuous annealing equipment of the present invention, the steel sheet reversed by the reversing roll is displaced in the plate width direction (reversing roll axis direction) of the steel sheet every time it is reversed, and the periphery of the reversing rolls 4a and 4b is spiral. Will move back and forth.

その結果、従来の横型の連続焼鈍設備では一方向にしか鋼板が進行しなかったため、炉内に蓄えられる鋼板量も少なく、長時間の熱処理を施すことが不可能であった。一方、本発明の連続焼鈍設備では、対向する反転ロールの周囲を往復することで、大量の鋼板を炉内に蓄えることができるので、長時間の熱処理が可能となる。例えば、対向する反転ロール間が30mの場合、従来の横型設備では、30mの間で熱処理を完了させる必要があったが、本発明の連続焼鈍設備では、10往復させた場合には、600mの鋼板を炉内に蓄えることができる。したがって、鋼板を5m/分の速度で炉内を通板した場合には、2時間という長時間の焼鈍が可能となる。   As a result, in the conventional horizontal type continuous annealing equipment, the steel sheet has progressed only in one direction, so that the amount of steel sheet stored in the furnace is small, and it has been impossible to perform heat treatment for a long time. On the other hand, in the continuous annealing facility of the present invention, a large amount of steel sheets can be stored in the furnace by reciprocating around the opposite reversing rolls, so that heat treatment can be performed for a long time. For example, when the distance between opposing reversing rolls is 30 m, in the conventional horizontal equipment, it was necessary to complete the heat treatment between 30 m, but in the continuous annealing equipment of the present invention, when reciprocating 10 times, 600 m Steel sheets can be stored in the furnace. Therefore, when the steel plate is passed through the furnace at a speed of 5 m / min, annealing for a long time of 2 hours is possible.

なお、上記ずれ角は、2〜10°の範囲とするのが好ましい。2°未満では、反転ロール間の距離が長くなりすぎるからであり、一方、10°を超えると、後述する鋼板とロール外周との間のスリップが大きくなり、鋼板を安定して通板することが難しくなり、表面疵が発生するようになるからである。   The deviation angle is preferably in the range of 2 to 10 °. If the angle is less than 2 °, the distance between the reversing rolls becomes too long. On the other hand, if the angle exceeds 10 °, slip between the steel sheet and the roll outer periphery described later increases, and the steel sheet is stably passed. This is because it becomes difficult to cause surface flaws.

また、本発明の連続焼鈍設備では、反転ロールを水平方向に対向して配設したので、鋼板の自重によって鋼板に付与される張力を大幅に軽減することができ、高温焼鈍における鋼板の炉内破断を回避することが可能となる。なお、対向する反転ロールの間が長い場合には、自重による撓み量が大きくなって鋼板に大きな張力が加わるようになるので、図1に示したような、鋼板を支持する支持ロール6を配設するのが好ましい。なお、この支持ロールは、図1のように1本である必要はなく、対向する反転ロール間の距離に応じて、適宜の本数、配設すればよい。好ましくは、5〜10mに1本の間隔で配設するのが望ましい。   Moreover, in the continuous annealing equipment of the present invention, since the reversing rolls are arranged facing the horizontal direction, the tension applied to the steel sheet by the weight of the steel sheet can be greatly reduced, and the inside of the steel sheet furnace in high temperature annealing Breaking can be avoided. When the distance between the opposite reversing rolls is long, the amount of bending due to its own weight increases and a large tension is applied to the steel sheet. Therefore, the support roll 6 for supporting the steel sheet as shown in FIG. It is preferable to install. Note that the number of the supporting rolls is not necessarily one as shown in FIG. 1, and an appropriate number of supporting rolls may be arranged according to the distance between the opposing reversing rolls. Preferably, it is desirable to arrange them at intervals of 5 to 10 m.

また、図1に示した本発明の連続焼鈍設備では、反転ロールは、長い胴長ロールとして、鋼板を1本のロールに複数回巻き付けるようにしているが、反転ロールを細分化して、1本のロールに対して1回巻き付けるようにしてもよい。なお、鋼板の走行安定性を確保するためには、個々のロールのずれ角を制御できる後者の方が好ましい。   Further, in the continuous annealing equipment of the present invention shown in FIG. 1, the reversing roll is a long body length roll, and the steel sheet is wound around one roll a plurality of times. You may make it wind once with respect to this roll. In order to secure the running stability of the steel sheet, the latter, which can control the deviation angle of each roll, is preferable.

なお、本発明の連続焼鈍設備のように、鋼板の進行方向と反転ロールの軸心とが直交していない場合には、反転ロールに巻き付いた鋼板は、ロールが回転するのに伴って軸心方向に移動する。すなわち、図3に示したように、反転ロールが回転して図3の(a)から(b)に変化した場合には、鋼板がロールと接触を開始するときの幅端部の位置は、○印の位置から●印の位置に移動する。したがって、鋼板がロール胴長の中央部に位置し続けるためには、鋼板がロール軸心方向に常にスリップしている必要がある。しかし、上記鋼板とロール表面との間でのスリップは、鋼板にスリ疵を発生したり、ロール表面の摩耗を促進したりするため好ましくない。また、鋼板に付与する張力を小さくすることで、上記弊害を軽減することはできるが、張力を低下し過ぎると、却って通板安定性を確保し難くなる。   In addition, as in the continuous annealing equipment of the present invention, when the traveling direction of the steel sheet and the axis of the reversing roll are not orthogonal to each other, the steel sheet wound around the reversing roll is centered as the roll rotates. Move in the direction. That is, as shown in FIG. 3, when the reversing roll rotates and changes from (a) to (b) in FIG. 3, the position of the width end when the steel sheet starts to contact the roll is: Move from the position marked with ○ to the position marked with ●. Therefore, in order for the steel sheet to continue to be positioned at the center of the roll body length, the steel sheet must always slip in the roll axis direction. However, the slip between the steel sheet and the roll surface is not preferable because it generates a scratch on the steel sheet or promotes wear on the roll surface. In addition, the above-described adverse effects can be reduced by reducing the tension applied to the steel sheet, but if the tension is excessively reduced, it is difficult to ensure the stability of sheet passing.

そこで、本発明の連続焼鈍設備では、上記弊害を回避するため、反転ロールの外周部分に、図4に示したようなスライド機構を設けることが好ましい。このスライド機構は、反転ロールの外周部分を外周方向にセグメント8で小分割し、それぞれのセグメントがロール軸心方向にスライド可能となっており、鋼板がロール軸心方向に移動するのに伴って、鋼板と一緒に動くことで、鋼板とロール表面との間のスリップを回避することができる。そして、鋼板の反転が終了し、鋼板との接触がなくなったセグメントは、元の位置に戻すことで、鋼板のロール軸心方向への移動をキャンセルすることができる。なお、上記各セグメントのスライド機構は、板との滑りが少なくなるように、駆動系を設けて強制的にスライドさせるのが好ましい。   Therefore, in the continuous annealing facility of the present invention, it is preferable to provide a slide mechanism as shown in FIG. In this slide mechanism, the outer peripheral portion of the reversing roll is subdivided into segments 8 in the outer peripheral direction, and each segment is slidable in the roll axial direction, and as the steel plate moves in the roll axial direction. By moving together with the steel plate, slip between the steel plate and the roll surface can be avoided. And the movement to the roll axis direction of a steel plate can be canceled by returning the segment which the inversion of the steel plate was complete | finished and contact with the steel plate was lost to the original position. In addition, it is preferable that the sliding mechanism of each segment is forcibly slid by providing a drive system so that the sliding with the plate is reduced.

また、上記反転ロールは、ロール径が600mmφ以上とすることが好ましい。ロール径が600mmφ未満では、板の曲げ歪が過大となり、鋼板の機械的特性等に悪影響を及ぼすおそれがあるからである。   The reverse roll preferably has a roll diameter of 600 mmφ or more. If the roll diameter is less than 600 mmφ, the bending strain of the plate becomes excessive, which may adversely affect the mechanical properties of the steel plate.

また、図1の連続焼鈍設備には、加熱装置として電気ヒータを用いた加熱装置7の例を示したが、本発明の連続焼鈍設備における加熱方法はこれに限定されるものではなく制限はない。したがって、高温に加熱できれば、いずれの方法を用いてもよく、例えば、ラジアントチューブのような輻射加熱方式や、誘導加熱方式や通電加熱方式でもよく、また、加熱した雰囲気ガスを炉内に吹き込む方式を用いてもよい。さらに、上記の方法を組み合わせて用いてもよい。   Moreover, although the example of the heating apparatus 7 which used the electric heater as a heating apparatus was shown in the continuous annealing equipment of FIG. 1, the heating method in the continuous annealing equipment of this invention is not limited to this, There is no restriction | limiting. . Therefore, any method may be used as long as it can be heated to a high temperature. For example, a radiant heating method such as a radiant tube, an induction heating method or an electric heating method may be used, and a method in which heated atmospheric gas is blown into the furnace. May be used. Further, a combination of the above methods may be used.

なお、本発明の連続焼鈍設備は、板厚が0.5mm以下の薄鋼板を対象とするものであることが好ましい。板厚が0.5mm超える鋼板では、高温焼鈍に起因して炉内破断を起こす頻度が少なく、本発明を適用する必要性がないからである。好ましくは、0.4mm以下、さらに好ましくは0.3mm以下の鋼板に適用するのが望ましい。   In addition, it is preferable that the continuous annealing equipment of this invention targets the thin steel plate whose plate | board thickness is 0.5 mm or less. This is because a steel sheet having a thickness exceeding 0.5 mm is less likely to cause in-furnace fracture due to high-temperature annealing, and there is no need to apply the present invention. Preferably, it is desirable to apply to a steel plate of 0.4 mm or less, more preferably 0.3 mm or less.

また、本発明の連続焼鈍設備は、750℃以上の温度で10分以上の均熱処理を施す焼鈍設備に適用することが好ましい。750℃未満あるいは10分未満では、従来の縦型の連続焼鈍設備でも十分に対応が可能であり、本発明を適用する必要性がないからである。特に、本発明の連続焼鈍設備は、900℃以上で60分以上の高温長時間焼鈍を行う設備に適しており、1200℃以上の熱処理にも適用することができる。   Moreover, it is preferable to apply the continuous annealing equipment of this invention to the annealing equipment which performs the soaking process for 10 minutes or more at the temperature of 750 degreeC or more. If it is less than 750 ° C. or less than 10 minutes, it is possible to sufficiently cope with conventional vertical continuous annealing equipment, and there is no need to apply the present invention. In particular, the continuous annealing equipment of the present invention is suitable for equipment that performs high-temperature long-time annealing at 900 ° C. or more for 60 minutes or more, and can also be applied to heat treatment at 1200 ° C. or more.

なお、上述した本発明の連続焼鈍設備の概要説明では、焼鈍炉3が1つの場合の例について説明したが、例えば、連続焼鈍設備を、加熱、均熱、冷却部分等に分割して、それぞれに上記と同じ構造の炉を設けてもよい。また、本発明の連続焼鈍設備は、高温長時間の焼鈍に適しているので、最も高温となる均熱部分を本発明の構造の炉とし、加熱および冷却部分は従来通りの炉としてもよい。   In the outline explanation of the continuous annealing equipment of the present invention described above, an example in the case of one annealing furnace 3 has been described. For example, the continuous annealing equipment is divided into heating, soaking, cooling portions, etc. A furnace having the same structure as described above may be provided. Moreover, since the continuous annealing equipment of the present invention is suitable for annealing at a high temperature for a long time, the soaking part at the highest temperature may be a furnace having the structure of the present invention, and the heating and cooling parts may be conventional furnaces.

また、本発明の連続焼鈍設備は、図1には示されていないが、コイル巻戻し設備と焼鈍炉との間に、切断・接合(溶接)設備やルーパーを設けて、連続してコイルを処理してもよい。また、上記切断・接合(溶接)設備の後方かつ炉前に、洗浄設備や酸洗設備、めっき設備等を設けもよいことは勿論である。   Further, although the continuous annealing equipment of the present invention is not shown in FIG. 1, a cutting / joining (welding) equipment and a looper are provided between the coil rewinding equipment and the annealing furnace, and the coil is continuously provided. It may be processed. Of course, cleaning equipment, pickling equipment, plating equipment, and the like may be provided behind the cutting / joining (welding) equipment and in front of the furnace.

本発明の熱処理設備は、従来の縦型や横型の連続焼鈍設備で焼鈍していたブリキ原板や冷延鋼板、高強度冷延鋼板、表面処理鋼板等の熱処理設備としても好適に用いることができる。さらに、本発明の熱処理設備は、高温長時間の熱処理が可能であるので、900℃以上の温度で二次再結晶焼鈍や純化焼鈍を行う方向性電磁鋼板の仕上焼鈍設備としても好適に用いることができる。   The heat treatment equipment of the present invention can also be suitably used as heat treatment equipment for tin plate, cold-rolled steel, high-strength cold-rolled steel, surface-treated steel, etc. that have been annealed by conventional vertical or horizontal continuous annealing equipment. . Furthermore, since the heat treatment equipment of the present invention can perform heat treatment for a long time at a high temperature, it should be suitably used as a finish annealing equipment for grain-oriented electrical steel sheets that performs secondary recrystallization annealing or purification annealing at a temperature of 900 ° C. or higher. Can do.

1:巻き戻し前のコイル
2:鋼板
3:熱処理炉
4、4a、4b:反転ロール
5:巻き取ったコイル
6:支持ロール
7:加熱装置
8:スライド機構
9:スライド機構を構成するセグメント
1: Coil before unwinding 2: Steel plate 3: Heat treatment furnace 4, 4a, 4b: Reversing roll 5: Coil wound up 6: Support roll 7: Heating device 8: Slide mechanism 9: Segment constituting the slide mechanism

Claims (6)

薄鋼板を、炉内に対向して配設された反転ロールに巻きつけて進行方向を反転し、炉内を往復させながら焼鈍を施す連続焼鈍設備において、上記反転ロールは、水平方向に対向し、かつ、ロール軸心が鋼板進行方向に直交する方向より一定方向にずれて配設されてなり、750℃以上の温度で10分以上の均熱処理が可能であることを特徴とする薄鋼板用連続焼鈍設備。 In a continuous annealing facility in which a thin steel plate is wound around a reversing roll disposed opposite to the furnace to reverse the traveling direction, and annealing is performed while reciprocating in the furnace, the reversing roll is opposed to the horizontal direction. And the roll axis is arranged in a fixed direction from the direction orthogonal to the steel plate traveling direction, and soaking at a temperature of 750 ° C. or more is possible for 10 minutes or more . Continuous annealing equipment. 上記直交方向からのずれ角が2〜10°であることを特徴とする請求項1に記載の薄鋼板用連続焼鈍設備。 The deviation angle from the said orthogonal direction is 2-10 degrees, The continuous annealing equipment for thin steel plates of Claim 1 characterized by the above-mentioned. 上記対をなす反転ロール間に鋼板支持ロールが配設されてなることを特徴とする請求項1または2に記載の薄鋼板用連続焼鈍設備。 The continuous annealing equipment for thin steel sheets according to claim 1 or 2, wherein a steel sheet support roll is disposed between the pair of reversing rolls. 上記反転ロールの外周に、鋼板を軸方向に移動させるスライド機構を設けてなることを特徴とする請求項1〜3のいずれか1項に記載の薄鋼板用連続焼鈍設備。 The continuous annealing equipment for thin steel sheets according to any one of claims 1 to 3, wherein a slide mechanism for moving the steel sheets in the axial direction is provided on the outer periphery of the reversing roll. 上記反転ロールのロール径が600mmφ以上であることを特徴とする請求項1〜4のいずれか1項に記載の薄鋼板用連続焼鈍設備。 The continuous annealing equipment for thin steel sheets according to any one of claims 1 to 4, wherein a roll diameter of the reversing roll is 600 mmφ or more. 上記薄鋼板は、板厚が0.5mm以下のものであることを特徴とする請求項1〜5のいずれか1項に記載の薄鋼板用連続焼鈍設備。 The said thin steel plate is a thing with a plate | board thickness of 0.5 mm or less, The continuous annealing equipment for thin steel plates of any one of Claims 1-5 characterized by the above-mentioned.
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