JP2003211205A - Apparatus and method for manufacturing hot-rolled steel strip - Google Patents
Apparatus and method for manufacturing hot-rolled steel stripInfo
- Publication number
- JP2003211205A JP2003211205A JP2002010273A JP2002010273A JP2003211205A JP 2003211205 A JP2003211205 A JP 2003211205A JP 2002010273 A JP2002010273 A JP 2002010273A JP 2002010273 A JP2002010273 A JP 2002010273A JP 2003211205 A JP2003211205 A JP 2003211205A
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- Japan
- Prior art keywords
- steel strip
- hot
- cooling
- rolled steel
- coiler
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、熱間圧延された熱
延鋼帯の製造設備及び熱延鋼帯の製造方法に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot rolled steel strip manufacturing facility and a hot rolled steel strip manufacturing method.
【０００２】[0002]
【従来技術】一般に、熱延鋼帯は、加熱炉においてスラ
ブを所定温度に加熱し、加熱されたスラブを粗圧延機で
所定厚みに圧延して粗バーとなし、ついで粗バーを複数
基のスタンドからなる連続熱間仕上げ圧延機において仕
上げ圧延して所定の厚みの鋼帯とし、この熱延鋼帯をラ
ンナウトテーブル上の冷却装置において冷却した後、コ
イラーで巻き取ることにより製造される。2. Description of the Related Art Generally, a hot-rolled steel strip is manufactured by heating a slab to a predetermined temperature in a heating furnace, rolling the heated slab to a predetermined thickness with a rough rolling machine to form a rough bar, and then forming a plurality of rough bars. It is manufactured by finish rolling in a continuous hot rolling mill consisting of a stand to obtain a steel strip having a predetermined thickness, cooling this hot rolled steel strip in a cooling device on a runout table, and winding it with a coiler.
【０００３】このような熱延鋼帯の製造は特に、熱間仕
上圧延機からコイラーまでのランナウトテーブルにおけ
る冷却工程での熱延鋼帯の通板性を第一に考えて行うた
めに、ランナウトテーブルは、回転する搬送ロールを密
に配置した構成とし、その上を熱延鋼帯が通板するよう
にしている。The production of such hot-rolled steel strip is carried out, in particular, in order to consider the threadability of the hot-rolled steel strip in the cooling process in the runout table from the hot finish rolling mill to the coiler as the first consideration. The table has a structure in which rotating conveying rolls are densely arranged, and a hot-rolled steel strip passes through the table.
【０００４】次に、熱延鋼帯の冷却は、鋼帯の上面側の
冷却においては、円管状のラミナー冷却ノズルからの冷
却水の注水で行われているが、鋼帯が上から落下する冷
却水の水圧で押されても鋼帯のパスラインが搬送ロール
の上接点を結んだ線から下へ押し込まれないようにする
ために、搬送ロール直上に、幅方向に直線状に複数の円
管ラミナーノズルを配置して行っている。搬送ロール直
上位置でしか冷却できないため、鋼帯上面側の冷却装置
の冷却能力には自ずと限界がある。Next, cooling of the hot rolled steel strip is carried out by pouring cooling water from a circular laminar cooling nozzle in cooling the upper surface of the steel strip, but the steel strip falls from above. In order to prevent the steel strip pass line from being pushed downward from the line connecting the upper contacts of the transport roll even if it is pushed by the water pressure of the cooling water, multiple circles are formed in a straight line in the width direction directly above the transport roll. This is done by arranging a tube laminar nozzle. Since the cooling can be performed only at the position directly above the transport roll, the cooling capacity of the cooling device on the upper surface side of the steel strip is naturally limited.
【０００５】また、熱延鋼帯の下面の冷却においては、
搬送ロール間に設けたスプレーノズルから冷却水を噴射
して鋼帯の冷却を行う冷却方法が一般的で、搬送ロール
間でしか冷却できないため、鋼帯下面側の冷却装置の冷
却能力にも自ずと限界がある。In cooling the lower surface of the hot rolled steel strip,
The cooling method is generally used to cool the steel strip by injecting cooling water from the spray nozzles provided between the transport rolls.Since it can be cooled only between the transport rolls, the cooling capacity of the cooling device on the bottom side of the steel strip is naturally limited. There is a limit.
【０００６】このようにランナウトテーブルにおける冷
却は、熱延鋼帯の安定通板を第一に考えているため、冷
却には制約があり、結果として１００ｍといった非常に
長い冷却設備が用いられるのが一般的であった。[0006] As described above, the cooling in the runout table has the first consideration of the stable threading of the hot-rolled steel strip. Therefore, the cooling is limited, and as a result, a very long cooling facility of 100 m is used. It was common.
【０００７】熱延鋼帯の製造に際しては、板厚２ｍｍ以
下の薄物熱延鋼帯を製造する場合には、板厚が薄い分、
能率を上げるために（生産量t/hrを維持するために）、
圧延速度を上げるのが通常である。ところが、現実に
は、熱延鋼帯の先端が搬送テーブル上を走行する際に先
端がフリーなので上下に踊って通板が不安定になって、
鋼帯の先端が跳ね上がってフライングと呼ばれる不安定
現象が発生したり、先端のつっかかりにより鋼帯途中に
中弛みが生じループと呼ばれる不安定現象が発生した
り、テーブルロール上で折れ込みアコーディオン状の詰
まりが発生する等、安定通板が妨げられていた。特に、
仕上圧延最終スタンドからの距離が３０ｍを超えると安
定通板が困難となった。In the production of hot rolled steel strip, when producing a thin hot rolled steel strip having a plate thickness of 2 mm or less,
In order to increase efficiency (to maintain production t / hr),
It is usual to increase the rolling speed. However, in reality, when the tip of the hot-rolled steel strip travels on the transport table, the tip is free, so it dances up and down, making the strip unstable.
The tip of the steel strip jumps up and an unstable phenomenon called flying occurs, or the tip of the steel strip causes a slack in the middle of the steel strip to cause an unstable phenomenon called a loop, or a accordion-like fold on the table roll. Stable stripping was hindered due to clogging. In particular,
If the distance from the final stand for finishing rolling exceeds 30 m, stable striping becomes difficult.
【０００８】このような薄物熱延鋼帯の安定通板と冷却
を行う方法が、種々開示されている。例えば、特開平５
−７９１７号公報には、仕上圧延前に先行する圧延材の
後端と後行する圧延材の先端とを溶接して、連続材と
し、連続的に張力を張った状態で圧延、搬送、冷却する
方法が開示されている。Various methods have been disclosed for stabilizing and passing such a thin hot-rolled steel strip. For example, JP-A-5
No. 7917 gazette discloses that a trailing end of a rolled material preceding the finish rolling and a leading end of a trailing rolled material are welded to form a continuous material, which is rolled, conveyed, and cooled in a continuously tensioned state. A method of doing so is disclosed.
【０００９】特開平６−３２８１１７号公報には、熱延
鋼帯の先端における冷却水の上下水量比を下面が多くな
るようにして冷却する方法が開示されている。Japanese Unexamined Patent Publication (Kokai) No. 6-328117 discloses a method of cooling the hot-rolled steel strip so that the lower surface of the hot-rolled steel strip has a larger ratio of water to water.
【００１０】実開昭５７−８２４０７に係る明細書に
は、熱間仕上圧延機とコイラーの間に設置されたホット
ランテーブルの上方に回転駆動するロールを設けて、鋼
帯に走行駆動力を与えるようにしたホットランテーブル
が開示されている。According to the specification of Japanese Utility Model Application Laid-Open No. 57-82407, a roll that is rotationally driven is provided above a hot run table installed between a hot finish rolling mill and a coiler, and a running drive force is applied to a steel strip. Such a hot run table is disclosed.
【００１１】特開昭６１−１０３６１４号公報には、ラ
ンナウトテーブル上に多数個のピンチロールを設置し
て、最終仕上圧延機から出る鋼帯先端を追跡し、鋼帯先
端がピンチロール直下を通過する時に押さえを開始し、
さらに下流側にあるピンチロールに鋼帯先端が到達した
時にこの下流側のピンチロールで押さえかつ前記上流側
にあるピンチロールを開放することにより、ランナウト
テーブル上を案内される鋼帯先端を常に一点で押さえる
方法が開示されている。In Japanese Patent Laid-Open No. 61-103614, a large number of pinch rolls are installed on a runout table and the tip of a steel strip coming out of a final finishing rolling mill is traced so that the steel strip tip passes directly under the pinch roll. Start pressing when you do
When the tip of the steel strip reaches the pinch roll on the further downstream side, it is held by this pinch roll on the downstream side and the pinch roll on the upstream side is opened, so that the tip of the steel strip guided on the runout table is always one point. A method of pressing with is disclosed.
【００１２】また、特開平９−５７３０３号公報には、
熱間仕上圧延機から３０ｍ以内にコイラーと巻き戻し機
を配置し、圧延直後、鋼帯を高温で巻き取り、コイル状
態で温度保持した後、巻き戻して冷却し、再度巻き取る
鋼帯の熱処理方法として、近接コイラーの考え方が開示
されている。また、特開昭５９−４７００１号公報に
は、熱間仕上圧延機の出側に近接コイラー、冷却装置、
遠方コイラーをその順に配置した鋼帯の製造設備として
近接コイラーの考え方が開示されている。Further, Japanese Patent Laid-Open No. 9-57303 discloses that
A coiler and an unwinder are arranged within 30 m from the hot finishing mill, and immediately after rolling, the steel strip is wound at a high temperature, held in a coil state, then rewound, cooled, and rewound. As a method, the idea of a proximity coiler is disclosed. Further, Japanese Patent Laid-Open No. 59-47001 discloses that a close-up coiler, a cooling device,
The concept of a proximity coiler is disclosed as a steel strip manufacturing facility in which distant coilers are arranged in that order.
【００１３】[0013]
【発明が解決しようとする課題】しかしながら、特開平
５−７９１７号公報に開示された発明によれば、薄物熱
延鋼帯の通板安定性は改善できるものの、設備費が膨大
となったり、圧延材の温度や圧延のスケジュールを厳格
に管理しなければならない等の問題点がある。特に、既
設の圧延設備列を改造して連続化することは難しく、既
存の設備を極力応用して簡便な方法で、薄い鋼板の安定
圧延通板冷却が行える設備が求められている。However, according to the invention disclosed in Japanese Patent Laid-Open No. 5-7917, although the strip running stability of the thin hot-rolled steel strip can be improved, the equipment cost becomes huge, There is a problem that the temperature of the rolled material and the rolling schedule must be strictly controlled. In particular, it is difficult to modify the existing rolling equipment row to make it continuous, and there is a demand for equipment capable of stable rolling and cooling of thin steel sheets by a simple method by applying existing equipment as much as possible.
【００１４】特開平６−３２８１１７号公報に開示され
た発明によれば、通常の冷却速度の冷却においては良好
な通板性を実現できるが、冷却水量比を変えると上下の
冷却がアンバランスとなって、急速な冷却が必要な場合
には鋼帯の上下面で材質が不均一となることが避けられ
ない。また、鋼帯の先端部とそれ以外の部分で冷却が不
均一となって材質が不均一となることが避けられない。According to the invention disclosed in Japanese Patent Laid-Open No. 6-328117, good plateability can be realized in cooling at a normal cooling rate, but if the cooling water amount ratio is changed, the upper and lower cooling become unbalanced. Therefore, when rapid cooling is required, it is unavoidable that the material becomes uneven on the upper and lower surfaces of the steel strip. In addition, it is inevitable that the tip end of the steel strip and the portion other than that become non-uniform and the material becomes non-uniform.
【００１５】実開昭５７−８２４０７号公報に係る明細
書や特開昭６１−１０３６１４号公報に開示される発明
には、板厚2.5mmを超える一般的な板厚の熱延鋼帯に対
しては有効で、高速搬送時にも適用可能である。しかし
ながら、鋼帯の板厚が薄くかつ高速に進行してくる鋼帯
先端の走行を制御することは、鋼帯先端が圧延機から離
れれば離れるほど難しくなる。すなわち、鋼帯先端のフ
リーな部分も長さが長くなるほど、先端の振動、転接、
回転体との接触によって鋼帯にループが発生し、このル
ープが成長すると、アコーディオン状になって詰まりが
発生したり、折れ込んで通板ができなくなることがあ
る。The invention disclosed in Japanese Utility Model Laid-Open No. 57-82407 and Japanese Patent Application Laid-Open No. 61-103614 discloses a hot rolled steel strip having a general sheet thickness exceeding 2.5 mm. Is effective, and can be applied even at high speed conveyance. However, it is more difficult to control the running of the steel strip tip, which has a thin strip thickness and advances at high speed, as the steel strip tip is farther from the rolling mill. That is, the longer the length of the free part of the steel strip, the more vibration, rolling contact,
A loop is generated in the steel strip due to the contact with the rotating body, and when this loop grows, it may become an accordion-like form and may be clogged, or it may be folded and the passage cannot be performed.
【００１６】特開平９−５７３０３号公報に開示される
発明においては、仕上圧延後に冷却を行なわずに高温で
巻き取ると、鋼では自己焼鈍効果によりＦｅ３Ｃやパー
ライトの凝集が生じて靭性が劣化する。したがってこの
方法では一般鋼の製造ができないという問題点がある。In the invention disclosed in Japanese Patent Laid-Open No. 9-57303, when the steel is wound at a high temperature without cooling after finish rolling, Fe 3 C or pearlite aggregates in the steel due to the self-annealing effect, and the toughness increases. to degrade. Therefore, this method has a problem that general steel cannot be manufactured.
【００１７】特開昭５９−４７００１号公報に開示され
る発明は、圧延後冷却しないで巻き取れるステンレス鋼
帯の高温巻き取りには効果があるが、一般鋼では冷却し
ないで高温で巻き取ると、自己焼鈍効果によりＦｅ３Ｃ
やパーライトの凝集が生じて靭性が劣化する。したがっ
て、この公報にあるように４０ｍ以内にコイラーを設け
る方法は、850℃程度の仕上温度から650℃程度以下まで
冷却しないと所要の鋼帯の品質を得ることができない一
般炭素鋼の製造には適用できない。The invention disclosed in Japanese Patent Application Laid-Open No. 59-47001 is effective for high-temperature winding of a stainless steel strip that can be wound without cooling after rolling, but for general steel, if it is wound at a high temperature without cooling. , Fe 3 C due to self-annealing effect
Aggregation of pearlite and pearlite occurs and toughness deteriorates. Therefore, the method of providing a coiler within 40 m as described in this publication is not suitable for the production of general carbon steel in which the required quality of steel strip cannot be obtained unless the finishing temperature of about 850 ° C. is cooled to about 650 ° C. or less. Not applicable.
【００１８】本発明はこのような事情に鑑みてなされた
もので、従来では１００ｍ以上の長いランナウトテーブ
ルとその後方にコイラーを配置する非常に大きなスペー
スを必要としていた熱延鋼帯の製造設備に代えて、コイ
ラーまで含めても、従来の半分以下の長さに納めること
ができるコンパクトな、全く新しい熱延鋼帯の製造設備
を提供することを課題とする。すなわち、熱間仕上圧延
機を出てからコイラーに至るまでの張力がかからない板
厚２ｍｍ以下の熱延鋼帯の先端部を安定に通板させなが
ら、かつ鋼帯先端から急速冷却し、極短時間で巻き取る
ことを可能とするコンパクトな熱延鋼帯の製造装置及び
熱延鋼帯の製造方法を提供することを課題とする。The present invention has been made in view of the above circumstances, and has been applied to a hot-rolled steel strip manufacturing facility which has conventionally required a very large space for arranging a long runout table of 100 m or more and a coiler behind it. Instead, even if it includes a coiler, the subject is to provide a compact and completely new hot-rolled steel strip manufacturing facility that can be stored in a length less than half of the conventional length. That is, the tip of a hot-rolled steel strip with a plate thickness of 2 mm or less that does not apply tension from the exit of the hot finish rolling mill to the coiler is stably passed, and is rapidly cooled from the tip of the steel strip to obtain an extremely short length. An object of the present invention is to provide a compact hot-rolled steel strip manufacturing apparatus and a hot-rolled steel strip manufacturing method that enable winding in a short time.
【００１９】[0019]
【課題を解決するための手段】前記課題を解決するため
の第１の手段は、熱間仕上圧延機の出側に設けられた、
仕上圧延した熱延鋼帯を冷却する冷却装置と、その下流
側に設けられた冷却した熱延鋼帯を巻き取るコイラーを
有する熱延鋼帯の製造設備であって、前記熱間仕上圧延
機の最終仕上圧延機から３０ｍ以内のところに前記コイ
ラーを配置したことを特徴とする熱延鋼帯の製造設備
（請求項１）である。[Means for Solving the Problems] A first means for solving the above problems is provided on the outlet side of a hot finishing mill.
A hot-rolled steel strip manufacturing facility having a cooling device for cooling the finish-rolled hot-rolled steel strip, and a coiler for winding the cooled hot-rolled steel strip provided on the downstream side of the cooling device. In the hot-rolled steel strip manufacturing facility (claim 1), the coiler is arranged within 30 m from the final finishing rolling mill.
【００２０】前記課題を解決するための第２の手段は、
前記第１の手段であって、最終仕上圧延機からの距離が
１０ｍ以内のところに、ピンチロールを配置したことを
特徴とするもの（請求項２）である。A second means for solving the above problems is
The first means is characterized in that a pinch roll is arranged at a distance of 10 m or less from the final finishing rolling mill (claim 2).
【００２１】前記課題を解決するための第３の手段は、
前記第１の手段であって、最終仕上圧延機からの距離が
１０ｍ以内のところに、冷却開始点が位置するように冷
却装置を配置したことを特徴とするもの（請求項３）で
ある。A third means for solving the above problems is
The first means is characterized in that the cooling device is arranged such that the cooling start point is located within a distance of 10 m from the final finishing rolling mill (claim 3).
【００２２】前記課題を解決するための第４の手段は、
前記第１の手段から第３の手段のいずれかであって、冷
却装置の冷却能力が板厚２ｍｍの熱延鋼帯を２００℃／
秒以上で冷却できる能力であることを特徴とするもの
（請求項４）である。A fourth means for solving the above problems is
Any of the first to third means, wherein the cooling capacity of the cooling device is 200 ° C. /
It is characterized in that it has the ability to cool in seconds or more (Claim 4).
【００２３】前記課題を解決するための第５の手段は、
熱間仕上圧延機で仕上圧延した熱延鋼帯を冷却し、冷却
された熱延鋼帯を巻き取ってコイルとする熱延鋼帯の製
造方法であって、前記熱間仕上圧延機の最終スタンドか
ら３０ｍ以内のところに配置したコイラーで、冷却され
た熱延鋼帯を巻き取ることを特徴とする熱延鋼帯の製造
方法（請求項５）である。A fifth means for solving the above-mentioned problems is as follows.
A method for manufacturing a hot-rolled steel strip, comprising cooling a hot-rolled steel strip finish-rolled by a hot-finishing rolling mill and winding the cooled hot-rolled steel strip into a coil, the final of the hot-finishing rolling mill. A hot-rolled steel strip manufacturing method (claim 5) is characterized in that a cooled hot-rolled steel strip is wound up by a coiler arranged within 30 m from a stand.
【００２４】鋼帯の先端が最終仕上圧延機を出てからコ
イラーに巻き取られるまでの張力がかからない状態で先
端がある速度（通常７００ｍｐｍ）程度以上で進行する
場合、最終仕上げ圧延機からある長さ以上離れた位置
で、フライングによる先端のまくれ上がりや先端のつっ
かかりにより鋼帯途中に中弛みが生じ、テーブルロール
上で折れ込みやアコーディオン状の詰まりが発生する
等、安定通板が困難となる。そこで、安定して鋼帯先端
が安定して走行する限界速度と板厚の関係を鋭意探索し
た結果、図１のような関係を見い出した。図１は、板厚
が1.2mm，2.0mm，2.5mmのそれぞれの場合の、最終仕上
圧延機からの距離に対する走行安定臨界速度の関係を示
したものである。走行安定臨界速度とは、この速度を越
えて鋼帯が搬送テーブル上を走行すると、その先端の走
行が不安定となる臨界速度のことで、この速度を超える
と鋼帯先端部に図２（１）に示すようなループが発生
し、鋼帯が座屈し、やがてこのループは大きく成長し、
折れ込みや、アコーディオン状の詰まりが発生したり、
あるいは図２（２）に示すようにフライングと呼ばれる
鋼帯先端が浮き上がる現象が発生する。When the tip of the steel strip advances at a certain speed (usually 700 mpm) or more with no tension applied from the time when the tip of the steel strip exits the final finishing mill to the time when it is wound around the coiler, a certain length from the final finishing mill is used. At a position more than a certain distance away, the tip of the steel rolls up due to flying and the tip is caught, causing a slack in the middle of the steel strip, which may cause folding on the table roll or accordion-like clogging, making stable striping difficult. . Therefore, as a result of diligent search for the relationship between the sheet speed and the limit speed at which the tip of the steel strip stably runs, the relationship shown in Fig. 1 was found. FIG. 1 shows the relationship between the traveling stable critical speed and the distance from the final finishing rolling mill when the plate thicknesses are 1.2 mm, 2.0 mm, and 2.5 mm, respectively. The traveling stable critical speed is the critical speed at which the traveling of the tip of the steel strip becomes unstable when the steel strip travels above this speed on the conveyor table. The loop as shown in 1) occurs, the steel strip buckles, and this loop grows big in the future,
Folding in, accordion-like clogging,
Alternatively, as shown in FIG. 2 (2), a phenomenon called "flying" in which the tip of the steel strip floats up occurs.
【００２５】板厚が厚い場合、例えば板厚2mm超えで
は、最終仕上圧延機から１００ｍ以上離れた位置でも安
定走行臨界速度が大きく走行不安定は発生しないが、板
厚が薄い場合、例えば２ｍｍ以下では、鋼帯先端が圧延
機から比較的近い領域でも安定走行臨界速度が小さくな
るので安定した走行が難しい。この傾向は、板が薄くな
るほど顕著になる。この場合は、スレッディング速度を
遅くしないと離れたコイラーまで安定して搬送すること
ができなくなる。したがって、板厚２ｍｍ以下でスレッ
ディング速度７００ｍｐｍを確保するためには、最終仕
上圧延機から３０ｍ以内にコイラーを配置することが必
要で、更に、最終仕上圧延機から１０ｍ以内にピンチロ
ールなどの、鋼帯を点接して上流側の鋼帯に張力を付与
すると同時に後流側に鋼帯先端を送り出す装置を設けこ
とが好ましい。また、別の方法として、上記ピンチロー
ルに替えて冷却装置を最終仕上圧延機から１０ｍ以内に
その先端が来るように配置するのが好ましい。When the plate thickness is large, for example, when the plate thickness exceeds 2 mm, the stable running critical speed is large even at a position 100 m or more away from the final finishing rolling mill, and running instability does not occur, but when the plate thickness is thin, for example, 2 mm or less. Therefore, stable traveling is difficult because the critical critical velocity for stable traveling becomes small even in a region where the steel strip tip is relatively close to the rolling mill. This tendency becomes more remarkable as the plate becomes thinner. In this case, unless the threading speed is slowed down, it becomes impossible to stably convey the coiler to a distant coiler. Therefore, in order to secure a threading speed of 700 mpm with a plate thickness of 2 mm or less, it is necessary to arrange the coiler within 30 m from the final finishing rolling mill, and further, within 10 m from the final finishing rolling mill, steel such as a pinch roll is used. It is preferable to provide a device for feeding the front end of the steel strip to the downstream side while applying tension to the steel strip on the upstream side by spot contacting the strips. As another method, it is preferable to replace the pinch roll with a cooling device so that the tip of the cooling device comes within 10 m from the final finishing mill.
【００２６】もちろん最終仕上圧延機後方１０ｍ以内に
コイラーを設けて鋼帯を点接して上流側の鋼帯に張力を
付与することも考えられるが、この場合は鋼帯が所定の
巻き取り温度まで冷却できない。Of course, it is conceivable that a coiler is provided within 10 m behind the final finishing rolling mill to point-contact the steel strips to apply tension to the steel strips on the upstream side, but in this case, the steel strips reach a predetermined coiling temperature. Can't cool.
【００２７】この冷却装置により、圧延直後の鋼帯の急
速な冷却が可能となるため、鋼帯の安定した製造が可能
となり、製品の歩留まりが高くなる。特に、鋼帯の先端
が最終仕上圧延機を出てからコイラーに巻き取られるま
での張力がかからない状態においても、張力がかかった
鋼帯中央部と、同じ冷却条件で冷却することが可能とな
る。その結果、鋼帯の最先端部から上面と下面の冷却条
件を全く同じとして、曲がりや冷却後の残留応力の発生
を少なくでき、鋼帯の長手方向、幅方向、厚み方向に結
晶粒径が揃った均質な熱延鋼帯の安定した製造が可能と
なる。また、巻取り後の鋼帯の表面スケールも薄く、後
の酸洗工程での酸洗が容易になるといった効果がある。Since this cooling device enables rapid cooling of the steel strip immediately after rolling, stable production of the steel strip becomes possible and the product yield is increased. In particular, even in the state where the tension from the end of the steel strip leaving the final finishing mill to the coiler is not applied, it is possible to cool under the same cooling conditions as the tensioned central portion of the steel strip. . As a result, it is possible to reduce the occurrence of bending and residual stress after cooling by setting the same cooling conditions from the tip of the steel strip to the upper surface and the lower surface, and the crystal grain size in the longitudinal direction, width direction, and thickness direction of the steel strip. Stable manufacturing of uniform hot rolled steel strips is possible. Further, the surface scale of the steel strip after winding is thin, which has the effect of facilitating pickling in the subsequent pickling step.
【００２８】通常、巻き取り温度は650℃程度以下であ
る。従って、最高速度１３００ｍｐｍ時にコイラーまで
に冷却するには、温度や板厚計測のためにセンサーを設
ける空冷域（約８ｍ）を除いて（３０ｍ−８ｍ）÷１３
００ｍｐｍ＝約１秒で、仕上がり温度850℃から所定巻
き取り温度650℃へ冷却するする必要がある。このため
には200℃/ｓ以上で冷却しないと冷却しきれない。従っ
て、２００℃／秒以上の冷却能力を有する冷却装置が必
要となる。Usually, the winding temperature is about 650 ° C or lower. Therefore, in order to cool down to the coiler at the maximum speed of 1300 mpm, except for the air cooling area (about 8 m) where a sensor for measuring temperature and plate thickness is installed (30 m-8 m) ÷ 13
It is necessary to cool from the finishing temperature of 850 ° C to the predetermined winding temperature of 650 ° C in 00 mpm = about 1 second. For this reason, cooling cannot be completed unless cooling is performed at 200 ° C / s or more. Therefore, a cooling device having a cooling capacity of 200 ° C./second or more is required.
【００２９】なお、仕上圧延後の熱延鋼帯の形状不良を
未然に感知し、下流側に配置した冷却装置やコイラー等
に円滑に搬送できるよう、反り計、板厚計、温度計等の
センサー類を配置できる３〜１０ｍの空冷域を設けるの
が好ましい。３ｍ未満では熱間仕上圧延機のロール冷却
水や冷却装置の冷却水の影響を受け上手く計測できな
い。一方、１０ｍ以上になると、所定能力の冷却装置の
配置が困難になる。It should be noted that, in order to detect a defective shape of the hot rolled steel strip after finish rolling and to convey it smoothly to a cooling device, a coiler or the like arranged on the downstream side, a warpage gauge, a plate thickness gauge, a thermometer, etc. It is preferable to provide an air cooling area of 3 to 10 m in which sensors can be arranged. If the length is less than 3 m, the roll cooling water of the hot finish rolling mill or the cooling water of the cooling device is affected, and the measurement cannot be performed well. On the other hand, if the length is 10 m or more, it becomes difficult to arrange a cooling device having a predetermined capacity.
【００３０】[0030]
【発明の実施の形態】本発明の１実施の形態を示す設備
配置を図３に、冷却装置を図４にそれぞれ示す。粗圧延
機１で圧延された粗バー２はテーブル上を搬送されて、
連続的に７つの熱間仕上圧延機群３で所定の厚みまで圧
延後、ランナウトテーブル４を送られて後方のコイラー
５で巻き取られて熱延鋼帯（熱延コイルとも言う）とな
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An equipment arrangement showing an embodiment of the present invention is shown in FIG. 3 and a cooling device is shown in FIG. The rough bar 2 rolled by the rough rolling machine 1 is conveyed on the table,
After being continuously rolled by a group of seven hot finishing rolling mills 3 to a predetermined thickness, the runout table 4 is fed and wound by a coiler 5 at the rear to form a hot rolled steel strip (also called a hot rolled coil).
【００３１】このランナウトテーブル４は直径３００ｍ
ｍの回転ロールがピッチは３５０ｍｍで配列されたもの
であり、熱間仕上圧延機群３とコイラー５の間に配置さ
れている。このランナウトテーブル４の最終仕上圧延機
３ｘから５ｍ〜１３ｍの間に冷却装置６が設けられてい
る。コイラー５は２つ並んで配置され、第１のコイラー
５ａは、コイラーの入側ピンチロールが最終仕上圧延機
３ｘから２２ｍ、第２のコイラー５ｂは、コイラーの入
側ピンチロールが最終仕上圧延機３ｘから２８ｍの位置
に配置されている。最終仕上圧延機３ｘから５ｍまでの
間の空冷帯には、板厚計７、仕上温度計８、板プロフィ
ル計９が設置されている。The runout table 4 has a diameter of 300 m.
The rotating rolls of m are arranged at a pitch of 350 mm, and are arranged between the hot finish rolling mill group 3 and the coiler 5. A cooling device 6 is provided between the final finish rolling mill 3x and 5 m to 13 m of the runout table 4. The two coilers 5 are arranged side by side, and the first coiler 5a has the inlet side pinch roll of the coiler 22 m from the final finishing rolling mill 3x, and the second coiler 5b has the inlet side pinch roll of the coiler the final finishing rolling mill. It is located at a position of 3m to 28m. A sheet thickness gauge 7, a finishing thermometer 8 and a sheet profile meter 9 are installed in the air cooling zone between the final finishing rolling mill 3x and 5 m.
【００３２】冷却装置６は、５０ｍｍピッチで配置され
た円管ラミナーノズル１１からなり、鋼帯のパスライン
の上方および下方から鋼帯を挟みこむように設置されて
いる。この上下の円管ラミナーノズル１１からは水量密
度が上面及び下面を、それぞれに対して3000Ｌ/（min・m
２）の冷却水が噴射されている。この円管ラミナーノズ
ル１１の先端は、鋼帯のパスラインから２００ｍｍ離れ
ており、ノズルが破損しないように、鋼帯と上方の円管
ラミナーノズル１１の先端との間に簀状ガイド１３を設
置している。このとき、鋼帯に作用する冷却水の流体力
が鋼帯の上下でバランスするよう冷却水を噴射すること
が好ましい。なお、このとき、冷却水の鋼帯走行方向に
冷却水の流動抵抗が加味されるので、冷却水が衝突しな
い場合に比べて安定走行臨界速度はやや小さくなる。The cooling device 6 is composed of circular tube laminar nozzles 11 arranged at a pitch of 50 mm, and is installed so as to sandwich the steel strip from above and below the pass line of the steel strip. From the upper and lower circular tube laminar nozzles 11, the water quantity density is 3000 L / (min · m
The cooling water of 2 ) is being jetted. The tip of the circular tube laminar nozzle 11 is 200 mm away from the pass line of the steel strip, and a cage-shaped guide 13 is installed between the steel strip and the tip of the upper circular tube laminar nozzle 11 so as not to damage the nozzle. is doing. At this time, it is preferable to inject the cooling water so that the fluid force of the cooling water acting on the steel strip is balanced above and below the steel strip. At this time, since the flow resistance of the cooling water is added to the traveling direction of the cooling water in the steel strip, the stable traveling critical speed is slightly smaller than that in the case where the cooling water does not collide.
【００３３】この関係を図５に模式的に示す。図５(ａ)
は、垂直に冷却水を噴射させた場合を示し、この場合
は、前述のように、冷却水が衝突しない場合に比べて安
定走行臨界速度はやや小さくなる。同図(ｂ)は垂直から
１０°傾けて噴射させた場合である。(ｂ)においては、
鋼帯に衝突した冷却水の流体力が、鋼帯の走行方向に働
くように上下のラミナーノズルはコイラーの方向へ１０
°傾けて設置されているので、冷却水が衝突しない場合
と安定走行臨界速度は変わらなくなってくる。より安定
な走行性を得るためには、ノズルの傾け角度は５°〜３
０°に設定するのが望ましい。５°未満では走行安定効
果が少ない。一方、３０°超えでは、上下ノズルからの
冷却水噴射圧力による拘束力が弱まり逆効果である。This relationship is schematically shown in FIG. Figure 5 (a)
Shows the case where the cooling water is sprayed vertically. In this case, as described above, the stable traveling critical speed is slightly smaller than that in the case where the cooling water does not collide. FIG. 7B shows the case where the fuel is jetted at an angle of 10 ° from the vertical. In (b),
The upper and lower laminar nozzles move toward the coiler so that the fluid force of the cooling water that collides with the steel strip acts in the traveling direction of the steel strip.
Since it is installed at an angle, the stable traveling critical speed will be the same as when the cooling water does not collide. In order to obtain more stable running performance, the tilt angle of the nozzle is 5 ° to 3
It is desirable to set it to 0 °. If it is less than 5 °, the running stability effect is small. On the other hand, if it exceeds 30 °, the restraining force due to the cooling water jetting pressure from the upper and lower nozzles is weakened, which is an opposite effect.
【００３４】本実施の形態では、円管ラミナーノズル１
１の先端と鋼帯パスラインとの距離は、２００ｍｍ（ノ
ズル先端と鋼帯の距離は（２００ｍｍ‐板厚））離れて
いるが、この距離は冷却能力と密接な関係がある。この
距離が２００ｍｍ以上離れると冷却が弱くなり、２００
℃/秒以上の強冷却が難しくなる。また、上面側のノズ
ルと鋼帯間距離と下面側のノズルと鋼帯間距離はほぼ同
じにしておく方が、鋼帯の安定走行性を確保する点から
望ましい。In this embodiment, the circular tube laminar nozzle 1 is used.
The distance between the tip of No. 1 and the steel strip pass line is 200 mm (the distance between the nozzle tip and the steel strip (200 mm-plate thickness)), but this distance is closely related to the cooling capacity. If this distance is more than 200mm, the cooling becomes weaker,
Strong cooling above ℃ / sec becomes difficult. Further, it is desirable that the distance between the nozzle on the upper surface side and the steel strip and the distance between the nozzle on the lower surface side and the steel strip are substantially the same in order to ensure stable running of the steel strip.
【００３５】もちろん、鋼帯の安定走行性を確保するに
は、鋼帯上下面が冷却水から受ける流体力を上下対称に
することであるから、上面側のノズルと鋼帯間距離と下
面側のノズルと鋼帯間距離は違っていても冷却水の噴射
圧力を上下で変更して、鋼帯上下面が冷却水から受ける
流体力を上下対称にすることも可能であるが、実際の操
業を考えると、冷却水の噴射圧力、ノズル鋼帯間距離
は、できるだけ上下で同じにしておくことが望ましい。Of course, in order to ensure stable running of the steel strip, the fluid force received from the cooling water on the upper and lower surfaces of the steel strip is made to be vertically symmetrical, so the nozzle on the upper surface side and the distance between the steel strips and the lower surface side. Even if the distance between the nozzle and the steel strip is different, it is possible to change the injection pressure of the cooling water up and down to make the fluid force received from the cooling water on the upper and lower surfaces of the steel strip symmetrical. Considering the above, it is desirable that the jetting pressure of the cooling water and the distance between the nozzle steel strips be the same at the top and bottom as much as possible.
【００３６】図４（ａ）においては、最終仕上圧延機３
ｘから５ｍまでの間の空冷帯に冷却水が流れ込まないよ
うに、また、冷却装置から冷却水が鋼帯に載って流出し
ないように、冷却装置６の入側および出側には冷却水を
鋼帯上から排除するためにパージノズル１４を設けてい
る。In FIG. 4A, the final finish rolling mill 3
In order to prevent the cooling water from flowing into the air-cooled zone between x and 5 m, and to prevent the cooling water from flowing out of the cooling device on the steel strip, the cooling water is supplied to the inlet side and the outlet side of the cooling device 6. A purge nozzle 14 is provided to remove the steel from above the steel strip.
【００３７】冷却水の上下の流体圧力差は、かかってい
る圧力の１０〜２０％上下で異なっていても、通板を安
定させる効果は変わらない。また、本実施例の冷却方式
の場合は、板にかかる流体圧は、ノズルとの距離が近い
ほど強く、遠いほど弱い。従って、上下から対称に冷却
水を噴射させると、鋼帯にはその中心に寄ろうとするセ
ンタリング力が働いて、鋼帯の軌道をノズル間中心に戻
そうとする力が生じる。Even if the fluid pressure difference between the upper and lower sides of the cooling water is different by 10 to 20% of the applied pressure, the effect of stabilizing the threading is not changed. Further, in the case of the cooling system of the present embodiment, the fluid pressure applied to the plate is stronger as the distance to the nozzle is shorter and weaker as it is farther. Therefore, when cooling water is jetted symmetrically from above and below, a centering force that tends to approach the center of the steel strip acts on the steel strip, and a force that returns the orbit of the steel strip to the center between nozzles is generated.
【００３８】なお、冷却装置内の通板を更に安定化させ
るために、図４（ｂ）、（ｃ）に示すように、冷却装置
の前後にピンチロール１８を設けてもよい。また、上部
ランナウトテーブル（搬送される鋼帯に対し下側に配置
された搬送ロール群と対向するように配置された駆動ロ
ール）を適宜設けてもかまわない。鋼帯と転接して鋼帯
を送り出すピンチロールはそのおのおのの距離が１０ｍ
以内であれば通板性に支障はない。基本的には、冷却装
置内では鋼帯先端の動きは、冷却水の流体圧で上下ノズ
ル間の中央を通過するように通板安定化する。Incidentally, in order to further stabilize the strips in the cooling device, pinch rolls 18 may be provided before and after the cooling device as shown in FIGS. 4 (b) and 4 (c). Further, an upper runout table (a driving roll arranged so as to face a conveying roll group arranged below the conveyed steel strip) may be appropriately provided. The distance between each pinch roll that rolls out the steel strip and sends it out is 10 m.
If it is within the range, there is no problem in stripability. Basically, in the cooling device, the movement of the steel strip tip is stabilized by the fluid pressure of the cooling water so as to pass through the center between the upper and lower nozzles.
【００３９】この冷却装置６により、連続仕上圧延機３
から圧延された鋼帯の先端を冷却する方法を説明する。
まず、遅くとも鋼帯先端が最終仕上圧延機３ｘから搬出
される前に、ノズルから冷却水を規定の流量で噴射して
おく。この時、上面と下面の噴射条件をなるべく同じに
するように噴射圧、流量を調整しておく。これは、通板
する鋼帯の上面と下面に働く流体圧が同じになり、鋼帯
が上下に振動したり、片寄ったりしないように通板させ
るためである。With this cooling device 6, the continuous finish rolling mill 3
The method of cooling the tip of the steel strip rolled from is described.
First, at the latest, before the front end of the steel strip is carried out from the final finishing mill 3x, cooling water is sprayed from the nozzle at a prescribed flow rate. At this time, the injection pressure and the flow rate are adjusted so that the injection conditions on the upper surface and the lower surface are as similar as possible. This is because the fluid pressure acting on the upper surface and the lower surface of the steel strip to be threaded is the same, and the steel strip is threaded so that it does not vibrate vertically or deviate.
【００４０】[0040]
【実施例】この設備において最終仕上板厚が１．２ｍｍ
の鋼帯を、スレッディング速度が７５０ｍｐｍでその先
端から通過させた。鋼帯の圧延仕上がり温度は８９０℃
であった。冷却装置出側の鋼帯温度は５００℃と十分な
冷却能力を有している。冷却装置を抜けて、鋼帯先端
は、第１のコイラーのピンチロールに噛みこまれその後
安定して巻き取られた。その間、鋼帯先端の通板異常や
折れ込みは発生しなかった。鋼帯先端が巻き取られた後
も、通板は安定していた。その後ズーミングによって最
高速度１３００ｍｐｍまで増速し、それに合わせて冷却
水噴射圧力を上げて、冷却装置出側の鋼帯温度を５００
℃に保った。また、同じ厚みの鋼帯を同圧延条件で圧延
し、圧延機から２９ｍの位置にある第２のコイラーで巻
き取った場合も通板は安定していた。[Example] With this equipment, the final finished thickness is 1.2 mm
Steel strip was passed from its tip at a threading speed of 750 mpm. Rolling finish temperature of steel strip is 890 ℃
Met. The steel strip temperature on the outlet side of the cooling device is 500 ° C., which is a sufficient cooling capacity. After passing through the cooling device, the tip of the steel strip was caught in the pinch roll of the first coiler and then stably wound. During that time, there was no abnormal running of the steel strip or folding. The strip was stable even after the steel strip was wound up. After that, the maximum speed was increased to 1300 mpm by zooming, the cooling water injection pressure was increased accordingly, and the steel strip temperature on the cooling device outlet side was increased to 500.
It was kept at ℃. Further, even when a steel strip having the same thickness was rolled under the same rolling conditions and wound by a second coiler located at a position 29 m from the rolling mill, the strip was stable.
【００４１】以上本発明では、鋼帯の最先端から定常部
と同じ冷却条件で冷却することが可能となり、鋼帯の中
央部以降と同じ熱履歴を実現できたので、コイル全体の
材質バラツキが小さく、強度、伸び、がコイル全体で一
様であった。１．２ｍｍでスレッディング速度が７５０
ｍｐｍであったので能率が上がった。As described above, according to the present invention, it is possible to cool from the leading edge of the steel strip under the same cooling conditions as the stationary portion, and the same heat history as that of the central portion of the steel strip and thereafter can be realized. It was small, and strength and elongation were uniform throughout the coil. Threading speed of 750 at 1.2 mm
Since it was mpm, the efficiency increased.
【００４２】本実施例では上下面の冷却を円管ラミナー
ノズルの場合について説明したが、冷却ノズルは円管ラ
ミナー方式以外に、スプレー方式や噴流方式等でもよ
い。なお、上面と下面の鋼帯に作用する流体圧を調整し
て鋼帯のセンタリング効果を働かせるための条件は、冷
却方式によって異なるので各冷却方式に応じて決定すれ
ばよい。In this embodiment, the cooling of the upper and lower surfaces has been described by using the circular tube laminar nozzle, but the cooling nozzle may be a spray method or a jet method other than the circular tube laminar method. The conditions for adjusting the fluid pressures acting on the steel strips on the upper surface and the lower surface to exert the centering effect of the steel strips differ depending on the cooling system, and may be determined according to each cooling system.
【００４３】[0043]
【比較例】比較例として以下の２つのケースについて実
施例と比較した。比較例１の設備配置を図６に示す。比
較例１は、実施例と同じ冷却装置６を設けて、冷却は実
施例と同じ上下対称な冷却を行ない、コイラーが１３５
ｍ離れた位置の通常の遠方コイラー１５で巻き取った。
比較例２の設備配置を図７に、その冷却装置の詳細図を
図８に示す。Comparative Example As a comparative example, the following two cases were compared with the example. The equipment arrangement of Comparative Example 1 is shown in FIG. In Comparative Example 1, the same cooling device 6 as that of the embodiment is provided, and the cooling is performed in the same vertical symmetrical manner as that of the embodiment, and the coiler has a cooling rate of 135.
It was wound up with a normal distant coiler 15 located at a distance of m.
FIG. 7 shows the equipment layout of Comparative Example 2, and FIG. 8 shows a detailed view of the cooling device.
【００４４】比較例２は従来の冷却方式であり、上面は
パスラインから１．５ｍの高さからヘアピン型円管ラミ
ナーノズル１６で搬送の駆動ロール１２上縁を狙って冷
却水を落下させる円管ラミナー方式、下面は、搬送の駆
動ロール１２間にスプレー冷却ノズル１７を配置して冷
却するスプレー冷却方式で上下非対称に間欠的な冷却を
行うものである。コイラーは実施例と同じ位置、すなわ
ち最終仕上圧延機３ｘから２２ｍおよび２９ｍにある第
１のコイラー５ａ、及び第２のコイラー５ｂで巻き取っ
た。Comparative Example 2 is a conventional cooling system, and the upper surface is a circle in which cooling water is dropped from the height of 1.5 m from the pass line to the upper edge of the driving roll 12 by the hairpin type laminar nozzle 16 for conveyance. The tube laminar method, the lower surface is a spray cooling method in which a spray cooling nozzle 17 is arranged between the driving rolls 12 for conveyance, and is intermittently cooled vertically and asymmetrically. The coiler was wound by the first coiler 5a and the second coiler 5b located at the same position as in the example, that is, 22m and 29m from the final finishing rolling mill 3x.
【００４５】この２つの比較例において最終仕上板厚が
１．２ｍｍ鋼帯を、スレッディング速度が７５０ｍｐｍ
でその先端から通過させ冷却と巻き取りを行なった。鋼
帯の圧延仕上がり温度は８９０℃であった。In these two comparative examples, a steel strip having a final finished thickness of 1.2 mm and a threading speed of 750 mpm was used.
Then, it was passed from its tip and cooled and wound up. The rolling finish temperature of the steel strip was 890 ° C.
【００４６】比較例１では、冷却が上下対称で強冷却が
可能であるので鋼帯の冷却は所定の冷却が得られるが、
冷却装置を抜けた後の鋼帯先端が７５０ｍｐｍの高速で
回転する搬送ロール上を通過し遠方のコイラーに到達す
るまでにフライング現象が発生して安定通板できなかっ
た。In Comparative Example 1, since cooling is vertically symmetrical and strong cooling is possible, a predetermined cooling can be obtained for cooling the steel strip.
After the steel strip passed through the cooling device, a flying phenomenon occurred until the tip of the steel strip passed over a conveyor roll rotating at a high speed of 750 mpm and reached a distant coiler, and stable striping could not be performed.
【００４７】比較例２では、通板を第１に考えて冷却が
非対称に行われているので、冷却能力が十分ではなく、
第１のコイラーに到達するまでに790℃までしか冷却し
きれなかった。従来の冷却である円管ラミナー方式は、
落下した冷却水が、鋼帯を下に押し下げるのでその落下
位置は搬送ロール上縁を狙う制約がある。また下面につ
いても、冷却水ノズルを設置するスペースが搬送ロール
間に限定されることから、鋼帯側から見ると冷却水の衝
突するパターンは上下で千鳥となって上下非対称冷却に
なり、冷却の弱い部分が存在する。In Comparative Example 2, since the cooling is performed asymmetrically with the passing plate as the first consideration, the cooling capacity is not sufficient,
By the time it reached the first coiler, it could only be cooled to 790 ° C. The circular tube laminar method that is conventional cooling is
Since the cooling water that has dropped pushes the steel strip downward, there is a restriction that the dropping position should aim at the upper edge of the transport roll. Also on the lower surface, since the space for installing the cooling water nozzle is limited between the transfer rolls, the pattern of the cooling water colliding from the steel strip side is staggered at the top and bottom, resulting in asymmetric cooling at the top and bottom. There is a weakness.
【００４８】また、通板性を第１に考えるので冷却水量
を増やすことができない。仮に冷却水量を増やすと鋼帯
に上下非対称な力が交互にかかり振動し、不安定通板に
つながる。このように従来方式の冷却は、上下非対称で
十分な強冷却が可能でない。以上の結果をまとめて表１
に示す。
（表１）Further, since the plateability is considered first, the amount of cooling water cannot be increased. If the amount of cooling water is increased, vertically asymmetrical forces are alternately applied to the steel strip to cause vibration and lead to unstable strip running. As described above, the conventional cooling is asymmetrical in the vertical direction and cannot sufficiently cool strongly. Table 1 is a summary of the above results.
Shown in. (Table 1)
【００４９】[0049]
【表１】 [Table 1]
【００５０】[0050]
【発明の効果】以上の説明から明らかなように、本発明
によれば次のような効果を得ることができる。
（１）鋼帯の先端の張力が働かない部分も、先端から安
定した通板・冷却を施すことが可能であるので鋼帯の中
央部と同様の定常的な冷却を施すことが可能となる。
（２）鋼帯の先端から所定の冷却が通板安定性を損ねる
ことなく可能となる。
（３）冷却装置を通板中に板の形状不良による通板トラ
ブルが減って、設備の稼働率がアップする。
（４）薄物特に２ｍｍ以下の鋼帯の安定通板と高速通板
・高速圧延が可能となる。
（５）巻取り後の鋼帯の表面スケールも薄く、後の酸洗
工程での酸洗が容易になるといった効果が得られる。
（６）熱延鋼帯の製造設備は、従来では１００ｍ以上の
ランナウトテーブルとその後方にコイラーを配置する非
常に広大なスペースを必要としていたが、本発明によれ
ば、コイラーまで含めても、従来の半分以下の長さに納
めることできるコンパクトな設備にすることが可能で、
大幅なスペースと設備費の削減になる。As is apparent from the above description, according to the present invention, the following effects can be obtained. (1) Since it is possible to perform stable stripping and cooling from the tip of a portion of the steel strip where the tension does not work, it is possible to perform the same steady cooling as in the central portion of the steel strip. . (2) Predetermined cooling from the tip of the steel strip is possible without impairing the strip running stability. (3) When the cooling device is used, the trouble of passing the plate due to the defective shape of the plate is reduced, and the operating rate of the equipment is increased. (4) Thin steel sheets, particularly stable steel strips of 2 mm or less, high-speed stripping and high-speed rolling are possible. (5) The surface scale of the steel strip after winding is thin, and the effect of facilitating pickling in the subsequent pickling step can be obtained. (6) The hot-rolled steel strip manufacturing equipment has conventionally required a very large space for arranging a runout table of 100 m or more and a coiler behind the runout table, but according to the present invention, even if the coiler is included, It is possible to make it a compact equipment that can be stored in less than half the length of conventional equipment,
Significant space and equipment cost savings.
【００５１】[0051]
【図１】通板の通板安定臨界速度と板厚、仕上げ圧延機
からの距離の関係を示す図である。FIG. 1 is a diagram showing a relationship between a plate passing critical speed, a plate thickness, and a distance from a finish rolling mill.
【図２】搬送テーブル上を送られる鋼帯の様子を模式的
に示した模式図である。FIG. 2 is a schematic diagram schematically showing a state of a steel strip sent on a transport table.
【図３】本発明の実施の形態の１例である圧延設備の概
要図である。FIG. 3 is a schematic diagram of rolling equipment which is an example of an embodiment of the present invention.
【図４】本発明の実施例の形態に使用される通板冷却装
置の詳細を示す模式図である。FIG. 4 is a schematic view showing details of a strip cooling device used in an embodiment of the present invention.
【図５】冷却水の流れの様子を示す模式図である。FIG. 5 is a schematic diagram showing the flow of cooling water.
【図６】比較例１の設備配置を示す模式図である。FIG. 6 is a schematic diagram showing an equipment arrangement of Comparative Example 1.
【図７】比較例２の設備配置を示す模式図である。FIG. 7 is a schematic diagram showing an equipment arrangement of Comparative Example 2.
【図８】比較例２の冷却装置詳細を示す模式図である。8 is a schematic diagram showing details of a cooling device of Comparative Example 2. FIG.
１−粗圧延機 ２−粗バー ３−熱間仕上圧延機 ４−ランナウトテーブル ５、５ａ、５ｂ−コイラー ６−冷却装置 ７−板厚計 ８−仕上温度計 ９−板プロフィル計 １０−鋼帯 １１−円管ラミナーノズル １２−駆動ロール １３−簀状のガイド １４−パージノズル １５−遠方コイラー １６−ヘアピン型円管ラミナーノズル １７−スプレー冷却ノズル １８−ピンチロール 1-Rough rolling mill 2-Coarse bar 3-Hot finish rolling mill 4-runout table 5, 5a, 5b-coiler 6-cooling device 7- Plate Thickness Gauge 8-Finishing thermometer 9-plate profile meter 10-steel strip 11-Cylindrical Laminar Nozzle 12-drive roll 13-Cage-shaped guide 14-Purge nozzle 15-far coiler 16-hairpin type circular tube laminar nozzle 17-Spray cooling nozzle 18-pinch roll
───────────────────────────────────────────────────── フロントページの続き (72)発明者 簑手 徹 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 日野 善道 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 冨田 省吾 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 Ｆターム(参考） 4E002 AD01 BD03 BD07 CB10 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Toru Kite 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Main Steel Pipe Co., Ltd. (72) Inventor Yoshino Hino 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Main Steel Pipe Co., Ltd. (72) Inventor Shogo Tomita 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Main Steel Pipe Co., Ltd. F-term (reference) 4E002 AD01 BD03 BD07 CB10
Claims (5)
上圧延した熱延鋼帯を冷却する冷却装置と、その下流側
に設けられた冷却した熱延鋼帯を巻き取るコイラーを有
する熱延鋼帯の製造設備であって、前記熱間仕上圧延機
の最終仕上圧延機から３０ｍ以内のところに前記コイラ
ーを配置したことを特徴とする熱延鋼帯の製造設備。1. A cooling device provided on the outlet side of a hot finish rolling mill for cooling a hot-rolled steel strip subjected to finish rolling, and a coiler for winding the cooled hot-rolled steel strip provided downstream thereof. A hot-rolled steel strip manufacturing facility having the hot-rolled steel strip manufacturing facility, wherein the coiler is arranged within 30 m from a final finish rolling mill of the hot finish rolling mill.
のところに、ピンチロールを配置したことを特徴とする
請求項１に記載の熱延鋼帯の製造設備。2. The hot-rolled steel strip manufacturing facility according to claim 1, wherein a pinch roll is arranged at a distance of 10 m or less from the final finishing rolling mill.
のところに、冷却開始点が位置するように冷却装置を配
置したことを特徴とする請求項１に記載の熱延鋼帯の製
造設備。3. The hot-rolled steel strip manufacturing facility according to claim 1, wherein a cooling device is arranged such that a cooling start point is located within a distance of 10 m from the final finishing rolling mill. .
鋼帯を２００℃／秒以上で冷却できる能力であることを
特徴とする請求項１から請求項３のうちいずれか１項に
記載の熱延鋼帯の製造設備。4. The cooling device according to claim 1, wherein a cooling capacity of the cooling device is a capacity capable of cooling a hot rolled steel strip having a plate thickness of 2 mm at 200 ° C./sec or more. Manufacturing equipment for the hot-rolled steel strips described.
を冷却し、冷却された熱延鋼帯を巻き取ってコイルとす
る熱延鋼帯の製造方法であって、前記熱間仕上圧延機の
最終スタンドから３０ｍ以内のところに配置したコイラ
ーで、冷却された熱延鋼帯を巻き取ることを特徴とする
熱延鋼帯の製造方法。5. A method for producing a hot rolled steel strip, comprising cooling a hot rolled steel strip finish-rolled by a hot finish rolling mill and winding the cooled hot rolled steel strip into a coil. A method for producing a hot rolled steel strip, comprising winding a cooled hot rolled steel strip with a coiler arranged within 30 m from a final stand of a finish rolling mill.
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