JP2001246413A - Device and method for cooling hot steel strip - Google Patents
Device and method for cooling hot steel stripInfo
- Publication number
- JP2001246413A JP2001246413A JP2000056215A JP2000056215A JP2001246413A JP 2001246413 A JP2001246413 A JP 2001246413A JP 2000056215 A JP2000056215 A JP 2000056215A JP 2000056215 A JP2000056215 A JP 2000056215A JP 2001246413 A JP2001246413 A JP 2001246413A
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- Japan
- Prior art keywords
- steel strip
- cooling
- cooling means
- hot
- rolled steel
- 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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Links
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- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、熱間圧延された高
温鋼帯を冷却するための冷却装置と、その冷却方法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for cooling a hot-rolled high-temperature steel strip and a cooling method thereof.
【０００２】[0002]
【従来の技術】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、ついでこの粗バー
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
いて所定の厚みの鋼帯となす。そして、この熱延鋼帯を
ランナウトテーブル上の冷却スタンドにおいて冷却した
後、巻き取り機で巻き取ることにより製造される。2. Description of the Related Art Generally, in a hot-rolled steel strip, a slab is heated to a predetermined temperature in a heating furnace, and the heated slab is rolled to a predetermined thickness by a rough rolling mill to form a coarse bar. A steel strip having a predetermined thickness is formed in a continuous hot finishing rolling mill including a base stand. Then, the hot-rolled steel strip is manufactured by cooling it in a cooling stand on a run-out table and winding it up by a winder.
【０００３】このような圧延された高温の鋼帯を連続的
に冷却するランナウトの冷却装置では、第１に鋼帯の通
板性が考慮されている。たとえば、鋼帯の上面冷却をな
すため、円管状のラミナー冷却ノズルから鋼帯搬送用の
ローラテーブル直上に、この幅方向に亘って直線状に複
数のラミナー冷却水を注水している。一方、鋼帯の下面
冷却として、ローラテーブル間にスプレーノズルが設け
られ、ここから冷却水を噴射する方法が一般的である。[0003] In such a runout cooling apparatus that continuously cools a rolled high-temperature steel strip, first, the sheet passing property of the steel strip is considered. For example, in order to cool the upper surface of the steel strip, a plurality of laminar cooling waters are injected linearly over the width direction from a laminar cooling nozzle having a tubular shape directly above a roller table for conveying the steel strip. On the other hand, in order to cool the lower surface of the steel strip, a spray nozzle is provided between the roller tables, and a method of injecting cooling water from the spray nozzle is generally used.
【０００４】したがって、このような冷却形態では鋼帯
の上下面の冷却が厳密には上下対称とならず、鋼帯の冷
却は特に上面側は間欠的な冷却となり、急速な冷却（た
とえば、板厚３ｍｍで冷却速度２００℃／ｓ以上）はほ
ぼ不可能である。Accordingly, in such a cooling mode, the cooling of the upper and lower surfaces of the steel strip is not strictly vertically symmetrical, and the cooling of the steel strip is intermittent cooling, particularly on the upper surface side, and is rapidly cooled (for example, a plate). A cooling rate of 200 ° C./s or more with a thickness of 3 mm) is almost impossible.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら近年は、
結晶粒径が細かい熱延鋼帯が、加工性に優れることと、
低Ｃｅｐでも強度が高いこと等から求められており、そ
のための急速な冷却（強冷却）が必要となっている。However, in recent years, however,
Hot rolled steel strip with fine crystal grain size has excellent workability,
Even at low Cep, it is required because of its high strength and the like. Therefore, rapid cooling (strong cooling) is required.
【０００６】このように、熱延鋼帯に対して急速冷却を
行うにあたって、従来の冷却装置では以下のような問題
がある。すなわち、鋼帯の上下面で冷却水がかかる冷却
開始位置が一致しないために、材質の不均一化につなが
る虞れがある。また、冷却後、鋼帯の上面には冷却水が
滞留し、上面側の過冷却を引き起こす。この過冷却は、
長手方向において一様とはならず、したがってこの方向
における冷却停止温度にばらつきが生じている。さら
に、幅方向についても冷却水が鋼帯端部からライン両側
へ流出するので、鋼帯中央部に比べて端部が過冷却にな
り易く、温度停止時間がばらついていた。その結果、材
質が均一にならなかった。[0006] As described above, the conventional cooling apparatus has the following problems in performing the rapid cooling of the hot-rolled steel strip. That is, since the cooling start positions at which the cooling water is applied to the upper and lower surfaces of the steel strip do not coincide with each other, there is a possibility that the material becomes uneven. Further, after cooling, cooling water stays on the upper surface of the steel strip, causing overcooling of the upper surface side. This supercooling
It is not uniform in the longitudinal direction, so that the cooling stop temperature in this direction varies. Furthermore, in the width direction, since the cooling water flows out from both ends of the steel strip to both sides of the line, the ends are easily supercooled compared to the central part of the steel strip, and the temperature stop time varies. As a result, the material was not uniform.
【０００７】そこで、鋼帯を横切るように流体を斜め方
向に噴射して鋼帯上面の冷却水を排出する方法（特開平
９−１４１３２２号公報）や、拘束ロールを水切りロー
ルとして冷却水を堰き止める方法（特開平１０−１６６
０２３号公報）のような水切り方法が提案されている。Therefore, a method of injecting a fluid obliquely across the steel strip to discharge the cooling water on the upper surface of the steel strip (Japanese Patent Laid-Open No. 9-141322), and a method of damping the cooling water by using a restraining roll as a draining roll. Stopping method (JP-A-10-166)
No. 023) has been proposed.
【０００８】しかしながら、前者の方法によると、強冷
却を行うと鋼帯上に大量の冷却水が滞留して水切り効果
がほとんどない。また、後者の方法では、圧延機を出て
から巻き取り機に至るまでの鋼帯先端はフリー状態で搬
送されるために、鋼帯は上下動しながら波を打ったよう
に無拘束の状態で通過する。そのため、ローラテーブル
上に拘束ロールを設けることは安定通板を妨げることに
なり、拘束ロールをランナウトの冷却装置に適用するこ
とは難しかった。また、無拘束で振動する鋼帯先端部付
近を強冷却しようとすると、先端の振動をさらに悪化さ
せて安定通板を確保することができない。However, according to the former method, a large amount of cooling water stays on the steel strip when strong cooling is performed, and there is almost no drainage effect. In addition, in the latter method, since the steel strip end from the exit of the rolling mill to the winding machine is transported in a free state, the steel strip is unconstrained as if waving while moving up and down. Pass by. Therefore, providing a constraining roll on a roller table hinders stable passing, and it was difficult to apply the constraining roll to a cooling device for a run-out. Further, if an attempt is made to strongly cool the vicinity of the tip of the steel strip which vibrates without restraint, the tip vibration is further deteriorated, and a stable passing plate cannot be secured.
【０００９】これに対して、特開平６−３２８１１７号
公報では、鋼帯の先端における冷却水の上下水量比を、
下面の水量を増やすことで有効冷却する方法が提案され
ている。しかしながら、冷却水量比を変えると上下面に
対する冷却がアンバランスとなり、特に急速な冷却が必
要な場合には材質の不均一が避けられなかった。そし
て、下面冷却が弱くなるので、材質的に必要な強冷却を
実現することが難しかった。On the other hand, Japanese Patent Application Laid-Open No. Hei 6-328117 discloses that the ratio of the amount of cooling water to the amount of
A method of effectively cooling by increasing the amount of water on the lower surface has been proposed. However, when the cooling water amount ratio is changed, the cooling of the upper and lower surfaces becomes unbalanced, and in particular, when rapid cooling is required, unevenness of the material cannot be avoided. And since lower surface cooling becomes weak, it was difficult to realize strong cooling required for the material.
【００１０】本発明は、上記の事情を考慮してなされた
ものであり、その目的とするところは、最終仕上げ圧延
機を出てから巻き取り機に至るまでのランナウトテーブ
ルにおいて張力がかからない鋼帯を安定して強冷却する
熱延鋼帯の冷却装置と、その冷却方法を提供しようとす
るものである。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a steel strip in which tension is not applied to a run-out table from a final finishing mill to a winding machine. And a cooling method for a hot-rolled steel strip that stably and strongly cools steel.
【００１１】[0011]
【課題を解決するための手段】そこで本発明は、かかる
問題点を解決するためになされていて、複数の回転する
ローラテーブル上を鋼帯が搬送されるランナウト上で、
ローラテーブル間に鋼帯と直近の位置に冷却水を噴射す
る下面冷却手段をなすノズル群を設置し、この下面冷却
ノズル群と相対する位置にライン上から昇降可能な上面
冷却手段をなすノズル群および、この上面冷却ノズル群
と一体となって昇降可能で、かつテーブルロールと周速
度が同一となるよう同期して回転する拘束ロールをそれ
ぞれ１つを１組とした上部冷却ブロックを複数配置し、
鋼帯先端が冷却装置を通過するのと同時に、順次上流側
の上部冷却ブロックから下降させ、同時に上下面冷却ノ
ズル群から冷却水を噴射して鋼帯の先端通過と同時に順
次鋼帯上下面に対する冷却を開始する。SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve such a problem, and has been made on a runout in which a steel strip is transported on a plurality of rotating roller tables.
A nozzle group serving as a lower surface cooling means for spraying cooling water at a position immediately adjacent to the steel strip between the roller tables, and a nozzle group serving as an upper surface cooling means capable of ascending and descending from the line at a position opposite to the lower surface cooling nozzle group. Also, a plurality of upper cooling blocks are provided, each of which is a set of restraining rolls that can move up and down integrally with the upper surface cooling nozzle group and rotate synchronously so as to have the same peripheral speed as the table roll. ,
At the same time as the steel strip tip passes through the cooling device, it is sequentially lowered from the upper cooling block on the upstream side, and at the same time, the cooling water is sprayed from the upper and lower surface cooling nozzles to simultaneously pass the steel strip tip and sequentially with respect to the upper and lower surfaces of the steel strip. Start cooling.
【００１２】以上のごとき冷却装置と冷却方法を採用す
ることにより、鋼帯先端がそれぞれの上下面冷却ノズル
群を通過する毎に冷却が開始されて、鋼帯先端の非冷却
部が少なくなり安定して冷却が施される鋼帯部分が長く
なって歩留まりが向上する。拘束ロールによって鋼帯に
張力をかけるので、冷却装置内の鋼帯パスラインが安定
し、長手方向の冷却状態が均一となり、品質が安定す
る。By employing the above-described cooling device and cooling method, cooling is started each time the tip of the steel strip passes through the upper and lower surface cooling nozzle groups, and the non-cooled portion at the tip of the steel strip is reduced and the steel strip is stabilized. As a result, the steel strip portion to be cooled is lengthened, and the yield is improved. Since tension is applied to the steel strip by the constraining rolls, the steel strip pass line in the cooling device is stabilized, the cooling state in the longitudinal direction becomes uniform, and the quality is stabilized.
【００１３】拘束ロールを備えたので、冷却装置から鋼
帯によって持ち出される冷却水が堰き止められ、冷却装
置下流側の鋼帯上に冷却水が残留することがなく、過冷
却を防止する。冷却停止温度が鋼帯の幅方向と長手方向
に一定となり、冷却中の上面と下面の冷却条件が全く同
じとなって、冷却中の曲がりや冷却後の残留応力の発生
を少なくでき、鋼帯の長手方向と幅方向および厚み方向
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。[0013] The provision of the constraining rolls prevents the cooling water carried out by the steel strip from the cooling device and prevents the cooling water from remaining on the steel strip on the downstream side of the cooling device, thereby preventing overcooling. The cooling stop temperature becomes constant in the width direction and the longitudinal direction of the steel strip, and the cooling conditions of the upper surface and the lower surface during cooling become completely the same, so that bending during cooling and generation of residual stress after cooling can be reduced, Thus, stable production of a homogeneous hot-rolled steel strip having a uniform crystal grain size in the longitudinal direction, the width direction, and the thickness direction is possible.
【００１４】[0014]
【発明の実施の形態】以下、本発明の実施の形態を、図
面を参照して説明する。図１は、熱延鋼帯の製造設備を
概略的に示し、図２は、冷却装置を概略的に示す。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 schematically illustrates a hot-rolled steel strip manufacturing facility, and FIG. 2 schematically illustrates a cooling device.
【００１５】粗圧延機で圧延された粗バー１は鋼帯搬送
路をなすローラテーブル上を搬送されて、連続的に７つ
の連続仕上げ圧延機２で所定の厚みまで圧延された後、
最終仕上げ圧延機２Ｅの後方のランナウトテーブル３に
導かれる。このランナウトテーブル３のほとんど大部分
は冷却装置５を構成していて、ここで冷却されたあと、
後方の巻き取り機４で巻き取られ熱延コイルとなる。The rough bar 1 rolled by the rough rolling mill is conveyed on a roller table forming a steel strip conveying path and continuously rolled to a predetermined thickness by seven continuous finishing mills 2.
It is guided to the run-out table 3 behind the final finishing mill 2E. Almost most of the run-out table 3 constitutes a cooling device 5, and after being cooled here,
It is wound by the rear winder 4 and becomes a hot rolled coil.
【００１６】上記ランナウトテーブル３における最終仕
上げ圧延機２Ｅと冷却装置５との間には、鋼帯温度計６
とγ線の板厚計７が設置されている。図２に示すよう
に、上記冷却装置５は、最終仕上げ圧延機２Ｅの後方約
１０ｍの位置から約２５ｍの位置に亘って設けられてい
る。冷却装置５の配置スペース内には、長手方向に約８
００ｍｍピッチで、直径３５０ｍｍの回転する鋼帯搬送
用のローラテーブル８が配置され、鋼帯搬送路を構成し
ている。すなわち、これらローラテーブル８は鋼帯１１
下面側に位置している。A steel strip thermometer 6 is provided between the final finishing mill 2 E and the cooling device 5 in the runout table 3.
And a gamma ray thickness gauge 7 are provided. As shown in FIG. 2, the cooling device 5 is provided from a position about 10 m behind the final finishing mill 2E to a position about 25 m behind. In the arrangement space of the cooling device 5, about 8
A roller table 8 for rotating a steel strip having a pitch of 00 mm and a diameter of 350 mm is arranged to form a steel strip transfer path. That is, these roller tables 8 are connected to the steel strip 11.
It is located on the lower surface side.
【００１７】上記ローラテーブル８の相互間に下面冷却
手段をなす、幅約１８６０ｍｍの下面冷却ノズル群９が
設けられ、さらにスノコ状のガイド１０が設けられる。
下面冷却ノズル群９は、鋼帯との接触を避けるためスノ
コ状ガイド１０より下側に幅方向に等間隔で設置されて
いる。上記スノコ状ガイド１０と鋼帯１１下面との距離
は、約３０ｍｍに設定されている。A lower surface cooling nozzle group 9 having a width of about 1860 mm, which forms a lower surface cooling means, is provided between the roller tables 8, and a guide 10 in the form of a saw is provided.
The lower surface cooling nozzle group 9 is provided at equal intervals in the width direction below the slender guide 10 in order to avoid contact with the steel strip. The distance between the saw-shaped guide 10 and the lower surface of the steel strip 11 is set to about 30 mm.
【００１８】一方、冷却装置５における搬送鋼帯１１の
上面側には、鋼帯搬送路を介して下面冷却ノズル群９と
対称の位置に上面冷却手段をなす上面冷却ノズル群１２
が設けられている。これら上面冷却ノズル群１２もスノ
コ状ガイド１０を備えていて、搬送される鋼帯１１と接
触しないようになっている。On the other hand, on the upper surface side of the transport steel strip 11 in the cooling device 5, an upper cooling nozzle group 12 forming an upper cooling means at a position symmetrical to the lower cooling nozzle group 9 via a steel strip transport path.
Is provided. These upper surface cooling nozzle groups 12 also have a saw-shaped guide 10 so that they do not come into contact with the steel strip 11 to be conveyed.
【００１９】上面冷却ノズル群１２はフレーム１４に支
持されていて、このフレーム１４の上面冷却ノズル群１
２後流側には拘束ロール１３が取付けられる。そして、
フレーム１４には空気シリンダー１５が連結されてい
て、これらで上部冷却ブロック２０が構成される。The upper cooling nozzle group 12 is supported by a frame 14, and the upper cooling nozzle group 1
2 A restraining roll 13 is attached to the downstream side. And
An air cylinder 15 is connected to the frame 14 and forms an upper cooling block 20.
【００２０】上記空気シリンダー１５の作用によって、
熱延鋼帯１１の上面と上面冷却ノズル群１２端部との距
離を、下面冷却ノズル群９端部と鋼帯１１の下面との距
離に等しくなるように、上部冷却ブロック２０の設置高
さを調整できるようになっている。By the action of the air cylinder 15,
The installation height of the upper cooling block 20 so that the distance between the upper surface of the hot-rolled steel strip 11 and the end of the upper cooling nozzle group 12 is equal to the distance between the end of the lower cooling nozzle group 9 and the lower surface of the steel strip 11. Can be adjusted.
【００２１】また、冷却装置５が作用しない非冷却時
は、鋼帯１１の先端が通過するのとタイミングを合わせ
て空気シリンダー１５が作動し、上面冷却ノズル群１２
と拘束ロール１３をライン上方約５００ｍｍの位置まで
上昇させ、これらを鋼帯１１から退避させるようになっ
ている。通常の、鋼帯１１に対する冷却作用時には上下
両面の冷却ノズル群１２，９先端相互間隔が鋼帯の板厚
＋６０ｍｍとなるように、上部冷却ブロック２０の降下
が設定されている。When the cooling device 5 is not operated and the cooling operation is not performed, the air cylinder 15 is operated at the same timing as the tip of the steel strip 11 passes, and the upper surface cooling nozzle group 12 is operated.
And the constraining rolls 13 are raised to a position of about 500 mm above the line, and these are retracted from the steel strip 11. The lowering of the upper cooling block 20 is set so that the interval between the tips of the cooling nozzle groups 12 and 9 on the upper and lower surfaces during the normal cooling operation on the steel strip 11 is +60 mm of the thickness of the steel strip.
【００２２】上記拘束ロール１３は、ローラテーブル８
と相対する位置にあって、直径２００ｍｍの回転駆動さ
れるロールであり、その回転はローラテーブル８の周速
と同一に制御される。The constraining roll 13 is a roller table 8
And a roll driven to rotate with a diameter of 200 mm, the rotation of which is controlled to be the same as the peripheral speed of the roller table 8.
【００２３】そして、上部冷却ブロック２０は冷却装置
５の長手方向に沿ってたとえば２０台、所定間隔を存し
て配置されており、それぞれのフレーム１４に空気シリ
ンダー１５が連結されているところから、各フレーム１
４は互いに独立して昇降駆動されるようになっている。The upper cooling blocks 20 are arranged at predetermined intervals along the longitudinal direction of the cooling device 5, for example, 20 units, and the air cylinders 15 are connected to the respective frames 14. Each frame 1
4 are driven up and down independently of each other.
【００２４】なお、上下面冷却ノズル群１２，９を構成
する冷却ノズルは鋼帯に対する急速冷却を行うために、
ここでは円柱状の円管ラミナーノズルを採用している。
また、これに限定されるものではなく別形式のノズルと
して、たとえばフラットラミナーノズルとスプレーノズ
ルを上下に組み合わせてもよい。The cooling nozzles constituting the upper and lower surface cooling nozzle groups 12, 9 perform rapid cooling of the steel strip.
Here, a columnar circular tube laminar nozzle is employed.
Further, the present invention is not limited to this, and as another type of nozzle, for example, a flat laminar nozzle and a spray nozzle may be combined vertically.
【００２５】このような冷却ノズルを選定する条件とし
て、少なくとも鋼帯１１の上面側と下面側とで鋼帯が冷
却水から受ける流体圧が上下でほぼ同じとなるように、
冷却ノズルの形式、水量密度や噴射圧力を調整し、ある
いは上面冷却ノズル群１２先端と鋼帯上面との距離に対
する、下面冷却ノズル群９先端と鋼帯下面との距離を調
整する。The conditions for selecting such a cooling nozzle are such that at least the fluid pressure received by the steel strip from the cooling water on the upper surface side and the lower surface side of the steel strip 11 is substantially the same in the vertical direction.
The type of the cooling nozzle, the water amount density and the injection pressure are adjusted, or the distance between the tip of the lower surface cooling nozzle group 9 and the lower surface of the steel strip relative to the distance between the tip of the upper surface cooling nozzle group 12 and the upper surface of the steel strip.
【００２６】これは、冷却中に鋼帯１１のパスラインが
拘束ロール１３とローラテーブル８の接点上にくるよう
にするためであり、不必要な張力と、それによって発生
する振動や蛇行、あるいはローラテーブル８や拘束ロー
ル１３による疵付きを避けるためである。なお、このよ
うに鋼帯１１上面と下面に対する冷却水の流体圧を調整
しても、巻き取り機４側の巻き取りに必要な張力が増え
ることはない。This is so that the pass line of the steel strip 11 comes to be on the contact point between the constraining roll 13 and the roller table 8 during cooling, and unnecessary tension and vibration or meandering caused by the tension are generated. This is to prevent the roller table 8 and the restraining roll 13 from being scratched. Adjusting the fluid pressure of the cooling water with respect to the upper and lower surfaces of the steel strip 11 in this manner does not increase the tension required for winding on the winder 4 side.
【００２７】上述したように、上下面冷却ノズル群１
２，９先端と鋼帯１１上下面との距離を約３０ｍｍに設
定したが、これは以下の理由による。すなわち、冷却ノ
ズル先端と鋼帯との距離をより離間すれば、冷却水の勢
いがノズル先端と鋼帯との間に存在する流体（冷却水）
によって吸収されてしまい弱まる。逆に、冷却ノズルと
鋼帯との距離をより接近させれば、冷却水の勢いが強ま
るために鋼帯は上面から噴射される冷却水から受ける面
圧と、下面から受ける面圧とがバランスする位置を通過
して、鋼帯の振動や片寄った走行を矯正しセンタリング
する効果が働く。As described above, the upper and lower cooling nozzle group 1
The distance between the tip of the steel strip 11 and the upper and lower surfaces of the steel strip 11 was set to about 30 mm for the following reason. That is, if the distance between the tip of the cooling nozzle and the steel strip is further increased, the momentum of the cooling water is increased by the fluid (cooling water) existing between the tip of the nozzle and the steel strip.
Weakened by absorption. Conversely, if the distance between the cooling nozzle and the steel strip is made closer, the momentum of the cooling water increases, so the steel strip balances the surface pressure received from the cooling water injected from the upper surface and the surface pressure received from the lower surface. And the centering effect is corrected by correcting the vibration of the steel strip and uneven running.
【００２８】そこで、冷却水が確実に鋼帯に到達し、鋼
帯を効率よく冷却するためには、冷却ノズルと鋼帯との
距離をあまり離すことができない結果となる。この距離
は、冷却ノズルがたとえば円管ラミナーノズルであっ
て、ラミナー流の直径が２〜５ｍｍ程度であれば３０〜
１００ｍｍが好ましい。Therefore, in order to ensure that the cooling water reaches the steel strip and that the steel strip is efficiently cooled, the distance between the cooling nozzle and the steel strip cannot be increased. This distance is 30 to 30 if the cooling nozzle is, for example, a circular laminar nozzle and the diameter of the laminar flow is about 2 to 5 mm.
100 mm is preferred.
【００２９】１００ｍｍ以上では、冷却水流の勢いが弱
まって強冷却が不可能になる。逆に、３０ｍｍ以下に近
づき過ぎると、冷却水の行き場がなくなり良好な水流が
得難くなる。したがって、急冷却が不可能となり、ある
いは冷却水の流れが鋼帯の中央部と端部とで大きく異な
って冷却ムラが発生する。なお、これは冷却ノズル形式
によって異なるので、その条件は上記の限りではない。If it is more than 100 mm, the cooling water flow is weakened, and strong cooling becomes impossible. Conversely, if it is too close to 30 mm or less, there is nowhere to go for the cooling water, and it becomes difficult to obtain a good water flow. Therefore, rapid cooling becomes impossible, or the flow of the cooling water is greatly different between the central portion and the end portion of the steel strip, causing uneven cooling. This condition differs depending on the cooling nozzle type, and the conditions are not limited to the above.
【００３０】つぎに、熱延鋼帯１１に対する冷却工程に
ついて説明する。最終仕上げ圧延機２Ｅから搬出された
熱延鋼帯１１の先端が最も入り側の上面冷却ノズル群１
２と下面冷却ノズル群９との対向位置を通過するのとタ
イミングを合わせて、上面冷却ノズル群１２と拘束ロー
ラ１３を支持したフレーム１４を降下させ、その上面冷
却ノズル群１２および対称位置の下面冷却ノズル群９か
ら冷却水の噴射を同時に開始する。Next, a cooling process for the hot-rolled steel strip 11 will be described. The top end of the hot-rolled steel strip 11 carried out of the final finishing mill 2E is the uppermost cooling nozzle group 1 on the most entry side.
The frame 14 supporting the upper surface cooling nozzle group 12 and the restraining roller 13 is lowered at the same timing as passing through the opposing position of the lower surface cooling nozzle group 9 and the lower surface cooling nozzle group 9, and the upper surface cooling nozzle group 12 and the lower surface at the symmetric position The injection of the cooling water from the cooling nozzle group 9 is started at the same time.
【００３１】このような工程の設定は、鋼帯の先端が通
過する以前に上下面冷却ノズル群１２，９から冷却水を
噴射すると、冷却水が鋼帯先端に対する通過の抵抗とな
り、先端の通板性を阻害する虞れがあることによる。The setting of such a process is such that when the cooling water is jetted from the upper and lower cooling nozzle groups 12, 9 before the tip of the steel strip passes, the cooling water becomes a resistance of passage to the tip of the steel strip, and the passage of the tip of the steel strip. This is because there is a possibility that the plate property may be impaired.
【００３２】鋼帯１１の先端が一旦通過した後は、上面
冷却ノズル群１２から噴射される冷却水の圧力と、下面
冷却ノズル群９から噴射される冷却水の圧力とのバラン
スによって、鋼帯１１のパスラインが一定に保たれる。
したがって、鋼帯１１に対して張力がかからない状態で
あっても、鋼帯の通板性が安定することになり、鋼帯に
対する均一な強冷却が施される。Once the tip of the steel strip 11 has passed, the steel strip is balanced by the pressure of the cooling water injected from the upper cooling nozzle group 12 and the pressure of the cooling water injected from the lower cooling nozzle group 9. Eleven pass lines are kept constant.
Therefore, even when tension is not applied to the steel strip 11, the sheet passing property of the steel strip is stabilized, and uniform strong cooling of the steel strip is performed.
【００３３】鋼帯の搬送にともない、冷却装置５の入り
側から第１番目の上部冷却ブロック２０が降下したあ
と、下流側へ第２番目の上部冷却ブロック２０が降下
し、さらに第３番目の上部冷却ブロック２０と、これ以
降の上部冷却ブロック２０が順々に降下する。各上部冷
却ブロック２０の降下のタイミングは、ラインに備えた
センサによって鋼帯１１の先端を検出し、その信号に応
じて各フレーム１４に接続される空気シリンダー１５の
作動が制御され、フレームが降下開始する。After the steel strip is conveyed, the first upper cooling block 20 descends from the entrance side of the cooling device 5, the second upper cooling block 20 descends downstream, and the third upper cooling block 20 further descends. The upper cooling block 20 and the subsequent upper cooling blocks 20 descend sequentially. The timing of the lowering of each upper cooling block 20 is determined by detecting the tip of the steel strip 11 by a sensor provided in the line, and controlling the operation of the air cylinder 15 connected to each frame 14 in accordance with the signal, thereby lowering the frame. Start.
【００３４】拘束ロール１３によって鋼帯１１に張力を
かけるので、冷却装置５内の鋼帯パスラインが安定し、
長手方向の冷却状態が均一となり、品質が安定する。Since tension is applied to the steel strip 11 by the restraining roll 13, the steel strip pass line in the cooling device 5 is stabilized,
The cooling state in the longitudinal direction becomes uniform, and the quality is stabilized.
【００３５】以上の設備において、仕上げ板幅が１５０
０ｍｍで、仕上げ板厚が３ｍｍの鋼帯をスレッディング
速度６５０ｍｐｍ、加速率９ｍｐｍ／ｓで加速し、最大
１２００ｍｐｍまで加速後、減速して６５０ｍｐｍで鋼
帯後端を尻抜けさせた。In the above equipment, the finished plate width is 150
A steel strip having a thickness of 0 mm and a finished plate thickness of 3 mm was accelerated at a threading speed of 650 mpm and an acceleration rate of 9 mpm / s, accelerated to a maximum of 1200 mpm, and then decelerated to cause the rear end of the steel strip to pass through at 650 mpm.
【００３６】鋼帯の加速時は、冷却装置５のオン−オフ
によって冷却水をオンする冷却ノズル数を増やすこと
と、各ノズルの水量を増加することで巻き取り温度が一
定となる制御を行った。そのとき、鋼帯１１は先端から
後端まで安定して冷却装置５を通過し、所定の冷却が行
われた。During acceleration of the steel strip, control is performed to increase the number of cooling nozzles for turning on the cooling water by turning the cooling device 5 on and off, and to control the winding temperature to be constant by increasing the amount of water in each nozzle. Was. At that time, the steel strip 11 stably passed through the cooling device 5 from the front end to the rear end, and was subjected to predetermined cooling.
【００３７】また、拘束ロール１３を備えたことによ
り、冷却装置５から鋼帯１１によって持ち出される冷却
水が堰き止められ、冷却装置の前後に冷却水の漏出はな
く、疵の発生もなかった。その結果、鋼帯１１のほぼ先
端から後端まで一定して結晶粒径が微細な熱延鋼帯を安
定して製造でき、かつ先端から後端まで巻き取り温度の
変動が１５℃以内の安定した冷却を実現できた。The provision of the constraining rolls 13 prevents the cooling water taken out of the cooling device 5 by the steel strip 11 from damping, so that there is no leakage of cooling water before and after the cooling device, and no flaws are generated. As a result, it is possible to stably produce a hot-rolled steel strip having a fine crystal grain size with a constant grain size substantially from the front end to the rear end of the steel strip 11, and a fluctuation in the winding temperature from the front end to the rear end within 15 ° C. Cooling was achieved.
【００３８】[0038]
【発明の効果】以上述べたように本発明によれば、以下
に述べるような効果を奏することとなる。As described above, according to the present invention, the following effects can be obtained.
【００３９】（１）鋼帯の先端がそれぞれの冷却ブロッ
クを通過する度に冷却が開始されるので、鋼帯の先端の
非冷却部が少なくなり安定して冷却が施される鋼帯が長
くなって、歩留まりが向上する。また、拘束ロールによ
って張力をかけるので、冷却装置内のパスラインが安定
し、鋼帯の長手方向の冷却状態が均一となり、品質が安
定する。(1) Since cooling is started every time the tip of the steel strip passes through each cooling block, the uncooled portion at the tip of the steel strip is reduced, and the steel strip to be stably cooled is long. As a result, the yield is improved. Further, since tension is applied by the constraining roll, the pass line in the cooling device is stabilized, the cooling state in the longitudinal direction of the steel strip becomes uniform, and the quality is stabilized.
【００４０】（２）鋼帯に対して上下対称に急速な冷却
が可能となり、しかも鋼帯の先端から急速冷却できて、
冷却効果が安定する。(2) Rapid cooling can be performed vertically and symmetrically with respect to the steel strip, and rapid cooling can be performed from the tip of the steel strip.
The cooling effect is stabilized.
【００４１】（３）拘束ロールによって冷却装置から鋼
帯によって持ち出される冷却水が堰き止められるので、
冷却装置の下流側の鋼帯上に冷却水が残留することな
く、過冷却を防止できる。しかも、冷却停止温度が鋼帯
の幅方向と長手方向に一定となり、冷却中の鋼帯の上面
と下面の冷却条件が同じとなる。このことから、冷却中
の曲がりや冷却後の残留応力の発生を少なくでき、鋼帯
の長手方向と、幅方向および厚み方向に結晶粒径が揃っ
た均質な熱延鋼帯を安定して製造できる。(3) Since the cooling water carried out by the steel strip from the cooling device is blocked by the restraining rolls,
Supercooling can be prevented without leaving cooling water on the steel strip on the downstream side of the cooling device. In addition, the cooling stop temperature becomes constant in the width direction and the longitudinal direction of the steel strip, and the cooling condition of the upper surface and the lower surface of the steel strip being cooled becomes the same. As a result, it is possible to reduce the occurrence of bending during cooling and residual stress after cooling, and to stably produce a uniform hot-rolled steel strip having a uniform crystal grain size in the longitudinal direction, width direction, and thickness direction of the steel strip. it can.
【００４２】（４）鋼帯先端が巻き取り機に巻き付くま
での通板が不安定の状態においても、冷却装置内に拘束
ロールを備えることで通板が安定し、均一な冷却が得ら
れる。その結果、材質が一定で歩留まりが高い。(4) Even if the passing of the steel strip until the end of the steel strip is wound around the winding machine is unstable, the provision of the constraining rolls in the cooling device stabilizes the passing of the steel strip and provides uniform cooling. . As a result, the material is constant and the yield is high.
【図１】本発明の一実施の形態を示す、圧延設備の概略
の構成図。FIG. 1 is a schematic configuration diagram of a rolling facility, showing an embodiment of the present invention.
【図２】同実施の形態の、冷却装置の概略の構成図。FIG. 2 is a schematic configuration diagram of a cooling device of the embodiment.
２Ｅ…最終仕上げ圧延機、 ５…冷却装置、 １２…上面冷却ノズル群、 １３…拘束ロール、 ８…ローラテーブル、 ９…下面冷却ノズル群、 ２０…上部冷却ブロック。 2E: Final finishing mill, 5: Cooling device, 12: Upper surface cooling nozzle group, 13: Restrained roll, 8: Roller table, 9: Lower surface cooling nozzle group, 20: Upper cooling block.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 今田 貞則 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 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Sadanori Imada 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Japan Inside the Kokan Co., Ltd. (72) Inventor Yoshimichi Hino 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Sun Honko Co., Ltd.
Claims (6)
延機の後方に設けられ、所定間隔を存して配置され熱延
鋼帯を搬送する複数のローラテーブルからなる鋼帯搬送
路と、 この鋼帯搬送路のローラテーブル相互間で、かつ鋼帯搬
送路を介して上下位置に配置される上面冷却手段および
下面冷却手段と、 上面冷却手段の後流側で上記ローラテーブルと相対する
位置に設けられ、上面冷却手段と一体に昇降駆動される
拘束ロールと、を具備したことを特徴とする熱延鋼帯の
冷却装置。1. A steel strip conveying path comprising a plurality of roller tables provided at a rear of a final finishing mill in a hot-rolled steel strip manufacturing facility and arranged at predetermined intervals to convey a hot-rolled steel strip; Upper surface cooling means and lower surface cooling means disposed between the roller tables of the steel strip transport path and vertically through the steel strip transport path; and a position facing the roller table on the downstream side of the upper surface cooling means. And a constraining roll driven up and down integrally with the upper surface cooling means.
延機の後方に設けられ、所定間隔を存して配置され熱延
鋼帯を搬送する複数のローラテーブルからなる鋼帯搬送
路と、 この鋼帯搬送路のローラテーブル相互間で、かつ鋼帯搬
送路を介して上下位置に配置される上面冷却手段および
下面冷却手段と、 上面冷却手段の後流側で上記ローラテーブルと相対する
位置に設けられ、上面冷却手段と一体に昇降駆動される
とともに、ローラテーブルと周速がほぼ同一となるよう
にその回転が設定された拘束ロールと、を具備したこと
を特徴とする熱延鋼帯の冷却装置。2. A steel strip conveying path comprising a plurality of roller tables provided behind a final finishing mill in a hot-rolled steel strip manufacturing facility and arranged at a predetermined interval for conveying the hot-rolled steel strip; Upper surface cooling means and lower surface cooling means disposed between the roller tables of the steel strip transport path and vertically through the steel strip transport path; and a position facing the roller table on the downstream side of the upper surface cooling means. And a constraining roll that is driven up and down integrally with the upper surface cooling means, and whose rotation is set so that the peripheral speed is substantially the same as that of the roller table. Cooling system.
の上面側と下面側が受ける流体圧が同一となるように冷
却条件が設定されることを特徴とする請求項１および請
求項２のいずれかに記載の熱延鋼帯の冷却装置。3. The cooling conditions of the upper surface cooling means and the lower surface cooling means are set such that fluid pressures received on the upper surface side and the lower surface side of the steel strip are the same. A cooling device for a hot-rolled steel strip according to any one of the above.
合わせて上面冷却手段および拘束ロールの組を順次降下
させ、拘束ロールをローラテーブルに転接するとともに
その上面冷却手段および対称位置の下面冷却手段から冷
却水を所定の条件で噴射して鋼帯を冷却することを特徴
とする熱延鋼帯の冷却方法。4. A set of the upper surface cooling means and the constraining roll is sequentially lowered by using the cooling device of the hot-rolled steel strip according to claim 1, in synchronization with the passage of the tip of the conveyed hot-rolled steel strip. And cooling the hot-rolled steel strip by rolling the constraining roll onto a roller table and injecting cooling water under predetermined conditions from the upper-side cooling means and the lower-side cooling means at symmetric positions.
わせて上面冷却手段および拘束ロールの組を順次降下さ
せ、拘束ロールをローラテーブルと同一の周速で回転さ
せるとともにローラテーブルに転接させ、同時に、その
上面冷却手段および対称位置の下面冷却手段から冷却水
を所定の条件で噴射して鋼帯を冷却することを特徴とす
る熱延鋼帯の冷却方法。5. A set of the upper surface cooling means and the constraining roll is sequentially lowered by using the hot-rolled steel strip cooling device according to claim 2 in a timely manner with respect to the passage of the tip of the conveyed hot-rolled steel strip, The constraining roll is rotated at the same peripheral speed as the roller table and is brought into rolling contact with the roller table, and at the same time, cooling water is injected from the upper surface cooling means and the lower surface cooling means at the symmetric position under predetermined conditions to cool the steel strip. A method for cooling a hot-rolled steel strip.
の上面側と下面側が受ける流体圧が同一となるように冷
却条件が設定されることを特徴とする請求項４および請
求項５いずれかに記載の熱延鋼帯の冷却方法。6. The cooling condition is set so that the upper surface cooling means and the lower surface cooling means receive the same fluid pressure on the upper surface side and the lower surface side of the steel strip. The method for cooling a hot-rolled steel strip according to any one of the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000056215A JP4120129B2 (en) | 2000-03-01 | 2000-03-01 | Hot-rolled steel strip cooling device and cooling method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000056215A JP4120129B2 (en) | 2000-03-01 | 2000-03-01 | Hot-rolled steel strip cooling device and cooling method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001246413A true JP2001246413A (en) | 2001-09-11 |
| JP4120129B2 JP4120129B2 (en) | 2008-07-16 |
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ID=18577208
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|---|---|---|---|
| JP2000056215A Expired - Fee Related JP4120129B2 (en) | 2000-03-01 | 2000-03-01 | Hot-rolled steel strip cooling device and cooling method thereof |
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| Country | Link |
|---|---|
| JP (1) | JP4120129B2 (en) |
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2000
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| JP2003105446A (en) * | 2001-09-26 | 2003-04-09 | Nkk Corp | High strength hot rolled steel sheet, and production method therefor |
| WO2004014577A1 (en) * | 2002-08-08 | 2004-02-19 | Jfe Steel Corporation | Cooling device, manufacturing method, and manufacturing line for hot rolled steel band |
| EP1527829A1 (en) * | 2002-08-08 | 2005-05-04 | JFE Steel Corporation | Cooling device, manufacturing method, and manufacturing line for hot rolled steel band |
| EP1527829A4 (en) * | 2002-08-08 | 2006-02-15 | Jfe Steel Corp | Cooling device,manufacturing method, and manufacturing line for hot rolled steel band |
| CN1304133C (en) * | 2002-08-08 | 2007-03-14 | 杰富意钢铁株式会社 | Cooling device, manufacturing method, and manufacturing line for hot rolled steel band |
| EP1889671A1 (en) * | 2002-08-08 | 2008-02-20 | JFE Steel Corporation | Cooling apparatus for hot rolled steel strip, manufacturing method for hot rolled steel strip, and production line for hot rolled steel strip |
| US7523631B2 (en) | 2002-08-08 | 2009-04-28 | Jfe Steel Corporation | Cooling device, manufacturing method, and manufacturing line for hot rolled steel band |
| US7779661B2 (en) | 2002-08-08 | 2010-08-24 | Jfe Steel Corporation | Cooling apparatus for a hot rolled steel strip and methods for cooling a hot rolled steel strip |
| CN102284480A (en) * | 2011-08-15 | 2011-12-21 | 湖州金冶电子材料股份有限公司 | Method for producing thin stainless strip steel |
| JP2013215770A (en) * | 2012-04-09 | 2013-10-24 | Nippon Steel & Sumitomo Metal Corp | Method for cooling hot-rolled steel sheet and method for manufacturing the same |
| AT16166U1 (en) * | 2016-11-22 | 2019-03-15 | Sms Group Gmbh | Cooling device and cooling arrangement for cooling a metal strip and cooling section |
| JP2022115684A (en) * | 2021-01-28 | 2022-08-09 | Ｊｆｅスチール株式会社 | Manufacturing equipment and manufacturing method of steel plate |
| JP7306413B2 (en) | 2021-01-28 | 2023-07-11 | Ｊｆｅスチール株式会社 | Steel plate manufacturing equipment and manufacturing method |
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