JPH10291021A - Method for cooling high-temperature steel sheet and device for cooling high-temperature steel sheet - Google Patents
Method for cooling high-temperature steel sheet and device for cooling high-temperature steel sheetInfo
- Publication number
- JPH10291021A JPH10291021A JP11416697A JP11416697A JPH10291021A JP H10291021 A JPH10291021 A JP H10291021A JP 11416697 A JP11416697 A JP 11416697A JP 11416697 A JP11416697 A JP 11416697A JP H10291021 A JPH10291021 A JP H10291021A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- cooling
- cooling water
- slit nozzle
- rear end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、熱間圧延された
高温鋼板を、均一に冷却する方法及び装置に関するもの
で、特に鋼板の前後端部を均一に冷却する方法及び装置
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for uniformly cooling a hot-rolled high-temperature steel sheet, and more particularly to a method and an apparatus for uniformly cooling front and rear ends of a steel sheet.
【０００２】[0002]
【従来の技術】近年、熱間圧延された高温の鋼板は、焼
き入れ熱処理による高強度化や低合金化によるコスト削
減を狙って、圧延直後に強冷却を施されることが多い。
この冷却は、圧延後の高温の鋼板をオンラインで通過さ
せながら行うのが一般的で、鋼板は水平の状態で搬送さ
れながら、上下から冷却水を注水されることにより冷却
される。2. Description of the Related Art In recent years, hot-rolled high-temperature steel sheets are often subjected to strong cooling immediately after rolling, with the aim of increasing strength by quenching heat treatment and reducing costs by reducing alloys.
This cooling is generally performed while a hot steel sheet after rolling is passed on-line, and the steel sheet is cooled by pouring cooling water from above and below while being transported in a horizontal state.
【０００３】この時、板幅方向および板長手方向の冷却
が平均的に同一に行われるように水量を調整、制御する
ことが重要である。[0003] At this time, it is important to adjust and control the amount of water so that the cooling in the plate width direction and the plate longitudinal direction is performed equally on average.
【０００４】通常、圧延直後の鋼板の冷却には、スリッ
ト状のラミナーノズルから、断面が略矩形状で層流の冷
却水を鋼板の搬送方向に流して冷却を行う。Normally, cooling of a steel sheet immediately after rolling is performed by flowing laminar cooling water having a substantially rectangular cross section in the conveying direction of the steel sheet from a laminar nozzle having a slit shape.
【０００５】この冷却方法、冷却装置としては、例え
ば、実開昭５８−４２０９号公報、特公平３−１０４０
７号公報、特公平７−８３７３号公報に開示されている
ものがある。The cooling method and the cooling device are described in, for example, Japanese Utility Model Laid-Open No. 58-4209, and Japanese Patent Publication No. 3-1040.
And Japanese Patent Publication No. 7-8373.
【０００６】実開昭５８−４２０９号公報に開示される
技術は、水切りロール間に設けたスリット状のラミナー
ノズルから、フラットなラミナー状の冷却水を落下さ
せ、その水流で鋼板の冷却を施す方法である。The technique disclosed in Japanese Utility Model Laid-Open Publication No. 58-4209 discloses a method in which flat laminar cooling water is dropped from a slit laminar nozzle provided between draining rolls, and the steel sheet is cooled by the water flow. Is the way.
【０００７】また、特公平３−１０４０７号公報に開示
される技術は、２つの水切りロールの中央付近に冷却水
を供給し、冷却水を鋼板に衝突させ、その後、鋼板進行
方向および鋼板の反進行方向に流れる冷却水で衝突点前
後の鋼板に冷却を施す方法である。[0007] Further, the technique disclosed in Japanese Patent Publication No. 3-10407 supplies cooling water to the vicinity of the center of two draining rolls and causes the cooling water to collide with the steel sheet. This is a method of cooling the steel plate before and after the collision point with cooling water flowing in the traveling direction.
【０００８】また、特特公平７−８３７３号公報に開示
される技術は、水切りロールの近傍、鋼板の近傍に設け
たスリット状のノズルから冷却水を板の進行方向に流し
て次の水切りロール近傍で吸引排除する方法である。The technique disclosed in Japanese Patent Publication No. 7-8373 discloses a technique in which cooling water flows from a slit-shaped nozzle provided in the vicinity of a draining roll or a steel plate in the traveling direction of the plate, and the next draining roll is rotated. This is a method of eliminating suction in the vicinity.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら、これら
いずれの方法も以下に記す問題がある。However, both of these methods have the following problems.
【００１０】実開昭５８−４２０９号公報や特公平３−
１０４０７号公報に開示される技術では、移動する鋼板
の先端が冷却水の噴射されているノズルの直下に到達し
て初めて冷却水が鋼板に接触し、その後冷却水は鋼板の
衝突点から上流側および下流側に流れ、逆流した水は上
流側の水切りロールに到達して初めて定常的な冷却が始
まる。Japanese Utility Model Application Laid-Open No. 58-4209 and
In the technology disclosed in Japanese Patent No. 10407, the cooling water contacts the steel plate only when the tip of the moving steel plate reaches just below the nozzle from which the cooling water is jetted, and then the cooling water flows upstream from the collision point of the steel plate. The water that flows back and downstream, and the back-flowed water reaches the upstream draining rolls, and starts steady cooling only when it reaches the upstream side.
【００１１】また、鋼板の後端が冷却装置を通過し終わ
る段階においても、板の後端がノズルの直下を通過した
後はもはや冷却水が鋼板に到達せず、冷却が施されな
い。以上のように、これらの方法では板の先端と後端で
冷却不足が生じる。Also, at the stage where the rear end of the steel sheet has passed through the cooling device, the cooling water no longer reaches the steel sheet after the rear end of the steel sheet has passed just below the nozzle, and cooling is not performed. As described above, these methods cause insufficient cooling at the leading and trailing ends of the plate.
【００１２】また、特特公平７−８３７３号公報に開示
される技術では、板の後端が冷却水噴射ノズル直下を通
過した後は冷却水が、鋼板上に供給されないために、や
はり鋼板後端部分の冷却が不足する。In the technique disclosed in Japanese Patent Publication No. 7-8373, cooling water is not supplied onto the steel plate after the rear end of the plate has passed just below the cooling water injection nozzle. Insufficient cooling at the ends.
【００１３】以上説明したように従来の鋼板の冷却装置
では鋼板の後端の冷却が不足する問題があった。As described above, the conventional steel sheet cooling apparatus has a problem that the rear end of the steel sheet is insufficiently cooled.
【００１４】本発明はかかる問題点を解決するためにな
されたもので、熱間圧延された高温の厚鋼板をスリット
ノズルから冷却水を噴射して水冷却する際、板の先端か
ら後端まで常に同じように冷却水が供給されて、均等な
冷却が可能となる冷却方法及び冷却装置を提供すること
を目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve such a problem. When a hot-rolled high-temperature steel plate is cooled by jetting cooling water from a slit nozzle from the front end to the rear end of the plate. It is an object of the present invention to provide a cooling method and a cooling device in which cooling water is always supplied in the same manner to enable uniform cooling.
【００１５】[0015]
【課題を解決するための手段】前記課題は、複数組の上
下拘束ロールで高温の鋼板を拘束しながら搬送し、搬送
途中において鋼板に上下から冷却水を注水して高温鋼板
を冷却するに高温鋼板の冷却方法であって、冷却水を鋼
板搬送方向下流側に向かって鋼板の上表面に沿って吐出
する第１のスリットノズルを鋼板搬送方向上流側の上拘
束ロールの下流側近傍に、冷却水を鋼板搬送方向上流側
に向かって鋼板の上表面に沿って吐出する第２のスリッ
トノズルを鋼板搬送方向下流側の上拘束ロールの上流側
近傍に、それぞれ設けておき、鋼板の先端部分を冷却す
るときは、第１のスリットノズルを使用し、鋼板の後端
部分を冷却するときは第２のスリットノズルを使用する
ことを特徴とする高温鋼板の冷却方法（請求項１）によ
り解決される。SUMMARY OF THE INVENTION The object of the present invention is to convey a high-temperature steel sheet while constraining it with a plurality of sets of upper and lower restraining rolls. A method for cooling a steel sheet, comprising: cooling a first slit nozzle that discharges cooling water along the upper surface of the steel sheet toward the downstream side in the steel sheet conveyance direction, near the downstream side of the upper constraining roll on the upstream side in the steel sheet conveyance direction. A second slit nozzle for discharging water along the upper surface of the steel sheet toward the upstream side in the steel sheet transport direction is provided near the upstream side of the upper constraining roll on the downstream side in the steel sheet transport direction, and the tip portion of the steel sheet is provided. The solution is achieved by a method for cooling a high-temperature steel sheet, wherein a first slit nozzle is used for cooling, and a second slit nozzle is used for cooling a rear end portion of the steel sheet. You.
【００１６】この方法によれば、鋼板の先端が冷却設備
を通過するときは、鋼板搬送方向上流側の上拘束ロール
の近傍に設置された第１のスリットノズルから冷却水が
供給されるので、鋼板の先端部から冷却を開始すること
ができる。According to this method, when the leading end of the steel sheet passes through the cooling equipment, the cooling water is supplied from the first slit nozzle installed near the upper constraining roll on the upstream side in the sheet conveying direction. Cooling can be started from the tip of the steel sheet.
【００１７】鋼板の後端部が冷却設備を通過するとき
は、前記第１のスリットノズルからの冷却水は鋼板上を
流れない。しかし、この場合には、鋼板搬送方向下流側
の上拘束ロールの近傍に設置された第２のスリットノズ
ルからの冷却水が鋼板上に供給されるので、鋼板の後端
部を有効に冷却することができる。When the rear end of the steel sheet passes through the cooling equipment, the cooling water from the first slit nozzle does not flow on the steel sheet. However, in this case, since the cooling water from the second slit nozzle installed near the upper constraining roll on the downstream side of the steel sheet transport direction is supplied onto the steel sheet, the rear end of the steel sheet is effectively cooled. be able to.
【００１８】鋼板の中央部を冷却するときは、第１、第
２どちらのスリットノズルを使用してもよい。When cooling the central portion of the steel sheet, either the first or second slit nozzle may be used.
【００１９】本明細書において、「鋼板の先端部」と
は、前記第２のスリットノズルの冷却水が鋼板上に落下
しない範囲を含む先側の部分をいい、「鋼板の後端部」
とは、前記第１のスリットノズルの冷却水が鋼板上に落
下しない範囲を含む後側の部分をいう。In the present specification, the "front end portion of the steel sheet" refers to a front portion including a range in which the cooling water of the second slit nozzle does not fall on the steel sheet, and "a rear end portion of the steel sheet".
The term “rear” means a rear portion including a range in which the cooling water of the first slit nozzle does not drop onto the steel plate.
【００２０】前記方法は、鋼板搬送方向上流側の上拘束
ロールの下流側近傍に設けられ、冷却水を鋼板搬送方向
下流側に向かって鋼板の上表面に沿って吐出する第１の
スリットノズルと、鋼板搬送方向下流側の上拘束ロール
の上流側近傍に設けられ、冷却水を鋼板搬送方向上流側
に向かって鋼板の上表面に沿って吐出する第２のスリッ
トノズルとを有してなる高温鋼板の冷却装置（請求項
２）により実施できる。The above method comprises a first slit nozzle provided near the upstream side of the upper constraining roll on the upstream side in the steel sheet transport direction and discharging cooling water along the upper surface of the steel sheet toward the downstream side in the steel sheet transport direction. A second slit nozzle provided near the upstream side of the upper constraining roll on the downstream side in the sheet conveying direction and discharging cooling water along the upper surface of the steel sheet toward the upstream side in the sheet conveying direction. It can be implemented by a steel plate cooling device (claim 2).
【００２１】[0021]
【発明の実施の形態】以下、本発明の実施の形態の例を
図を用いて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.
【００２２】図１は、本発明の実施の形態にかかる設備
の例を説明する概略図である。図１において、１は鋼
板、２は上ロール、３は下ロールで鋼板１は上ロール２
と下ロール３の間に挟まれて拘束されながら冷却され
る。４は鋼板１の搬送方向上流側に設けられたスリット
ノズルであり、５はそのヘッダ、６はそのスカート部で
ある。７は鋼板１の搬送方向下流側に設けられたスリッ
トノズルであり、８はそのヘッダ、９はそのスカート部
である。各スリットノズル４、７への冷却水は、冷却水
本管１２より、それぞれ冷却水遮断弁１０、１１を介し
て供給される。１３は円管ノズルであり、冷却水を噴射
して鋼板下面を冷却している。各スリットノズル４、７
のスカート部６、９は、例えば、幅約５ｍ、スリットの
ギャップ約５ｍｍ程度の細長い長方形断面を有し、ヘッ
ダー５、８に幅方向に切れ目なく接続されている。FIG. 1 is a schematic diagram illustrating an example of equipment according to an embodiment of the present invention. In FIG. 1, 1 is a steel plate, 2 is an upper roll, 3 is a lower roll, and a steel plate 1 is an upper roll 2.
It is cooled while being constrained by being sandwiched between the lower roll 3. Reference numeral 4 denotes a slit nozzle provided on the upstream side in the transport direction of the steel plate 1, reference numeral 5 denotes its header, and reference numeral 6 denotes its skirt. Reference numeral 7 denotes a slit nozzle provided on the downstream side in the transport direction of the steel sheet 1, reference numeral 8 denotes a header thereof, and reference numeral 9 denotes a skirt portion thereof. Cooling water to each of the slit nozzles 4 and 7 is supplied from a cooling water main pipe 12 through cooling water cutoff valves 10 and 11, respectively. Reference numeral 13 denotes a circular tube nozzle, which cools the lower surface of the steel plate by injecting cooling water. Each slit nozzle 4, 7
The skirt portions 6 and 9 have an elongated rectangular cross section with a width of about 5 m and a slit gap of about 5 mm, for example, and are seamlessly connected to the headers 5 and 8 in the width direction.
【００２３】上流側スリットノズル４から流出した冷却
水は、鋼板１の上面に沿って、鋼板１の搬送方向下流側
へ一様に流れ、鋼板１を冷却する。下流側スリットノズ
ル７から流出した冷却水は、鋼板１の上面に沿って、鋼
板１の搬送方向上流側へ一様に流れ、鋼板１を冷却す
る。The cooling water flowing out of the upstream slit nozzle 4 uniformly flows along the upper surface of the steel sheet 1 to the downstream side in the transport direction of the steel sheet 1 and cools the steel sheet 1. The cooling water flowing out of the downstream side slit nozzle 7 flows uniformly along the upper surface of the steel sheet 1 to the upstream side in the transport direction of the steel sheet 1 and cools the steel sheet 1.
【００２４】本発明の冷却方法の実施の形態の例を図２
を用いて説明する。図２において、図１に記載されてい
るものと同じ要素には、同じ符号を付して説明を省略す
る。FIG. 2 shows an embodiment of the cooling method according to the present invention.
This will be described with reference to FIG. 2, the same elements as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
【００２５】図２において、（ａ）は、鋼板１の先端部
が冷却装置に入ってきた直後の状態を示す。鋼板１の先
端部は未だ下流側スリットノズル７の位置に達していな
い。この状態では、冷却水遮断弁１０を開とし、冷却水
遮断弁１１を閉として、上流側スリットノズル４のみを
使用する。FIG. 2A shows a state immediately after the leading end of the steel plate 1 has entered the cooling device. The tip of the steel plate 1 has not yet reached the position of the downstream slit nozzle 7. In this state, the cooling water cutoff valve 10 is opened, the cooling water cutoff valve 11 is closed, and only the upstream slit nozzle 4 is used.
【００２６】鋼板１の先端部は、既にスリットノズル４
からの冷却水の落下点には達しているので、スリットノ
ズル４からの冷却水は鋼板１の上面に沿って下流側に流
れ、通常の冷却が実行される。The tip of the steel plate 1 is already in the slit nozzle 4
The cooling water from the slit nozzle 4 flows to the downstream side along the upper surface of the steel sheet 1, and normal cooling is performed.
【００２７】図２の（ｂ）は、鋼板１の先端部が下流側
のロール２、３の位置を通過した時点の位置関係を示す
図である。この実施の形態においては、この時点で、冷
却水遮断弁１１を開とし、続いて冷却水遮断弁１０を閉
として上流側スリットノズル４からの冷却水を遮断す
る。すると、下流側スリットノズル７から冷却水が吐出
され、鋼板１の上面に沿って上流側に流れ、上流側スリ
ットノズル４からの冷却水と衝突する。以後の冷却は、
下流側スリットノズル７からの冷却水により行われる。FIG. 2B is a diagram showing the positional relationship at the time when the leading end portion of the steel sheet 1 has passed the positions of the rolls 2 and 3 on the downstream side. In this embodiment, at this time, the cooling water cutoff valve 11 is opened, and then the cooling water cutoff valve 10 is closed to shut off the cooling water from the upstream slit nozzle 4. Then, the cooling water is discharged from the downstream slit nozzle 7, flows upstream along the upper surface of the steel plate 1, and collides with the cooling water from the upstream slit nozzle 4. Subsequent cooling,
This is performed by cooling water from the downstream slit nozzle 7.
【００２８】図２の（ｃ）は、鋼板１の後端部が、上流
側ロール２、３及び上流側スリットノズル４からの冷却
水の落下点を外れた位置に来た時点の位置関係を示す図
である。この時点においても、冷却は下流側スリットノ
ズル７からの冷却水により行われているので、鋼板１後
端部の冷却も定常どおり行われる。FIG. 2C shows the positional relationship when the rear end of the steel sheet 1 comes to a position outside the drop point of the cooling water from the upstream rolls 2 and 3 and the upstream slit nozzle 4. FIG. Also at this time, since the cooling is performed by the cooling water from the downstream slit nozzle 7, the cooling of the rear end portion of the steel sheet 1 is also performed as usual.
【００２９】なお、以上の説明においては、鋼板１の先
端部が下流側のロール２、３を通過した時点で直ちに使
用するスリットノズルを下流側スリットノズル７に切り
替え、中央部の冷却にも下流側スリットノズル７を使用
したが、スリットノズル４、７の切り換えのタイミング
を、鋼板１の後端部が上流側ロール２、３に近づいたタ
イミングとし、鋼板１の中央部を上流側スリットノズル
４を使用して行ってもよい。In the above description, the slit nozzle to be used is switched to the downstream slit nozzle 7 immediately after the leading end of the steel sheet 1 has passed the rolls 2 and 3 on the downstream side, and the downstream is also used for cooling the central portion. Although the side slit nozzle 7 was used, the switching timing of the slit nozzles 4 and 7 was set to the timing when the rear end of the steel plate 1 approached the upstream rolls 2 and 3 and the central portion of the steel plate 1 was set to the upstream slit nozzle 4. May be used.
【００３０】なお、スリットノズル４、７の切り換えの
タイミングにおいて、鋼板１上で両者の冷却水が衝突
し、以後流れが逆転するが、調査の結果、このことに起
因する冷却のムラは観測されなかった。At the switching timing of the slit nozzles 4 and 7, the two coolants collide with each other on the steel plate 1 and the flow reverses thereafter. As a result of the investigation, the uneven cooling caused by this was observed. Did not.
【００３１】[0031]
（実施例）図１に示す設備を使用して、図２に示した方
法で高温鋼板の冷却を実施した。この実施例において
は、各上下ロール間のピッチは１５００ｍｍであった。
スリットノズル４および７の幅は５ｍ、スリットのギャ
ップは５ｍｍであった。冷却水量は冷却水遮断弁１０、
１１が開の時、それぞれ、幅１ｍ当たり１５００リット
ル／minであった。一方、下面は１００ｍｍピッチで千
鳥に配置された円管ノズル１３から噴射した冷却水で冷
却した。(Example) Using the equipment shown in FIG. 1, cooling of a high-temperature steel sheet was carried out by the method shown in FIG. In this example, the pitch between the upper and lower rolls was 1500 mm.
The width of the slit nozzles 4 and 7 was 5 m, and the gap between the slits was 5 mm. The cooling water amount is the cooling water shutoff valve 10,
When 11 was open, it was 1500 liters / min per meter width. On the other hand, the lower surface was cooled by cooling water jetted from circular nozzles 13 arranged in a staggered manner at a pitch of 100 mm.
【００３２】この冷却装置に圧延直後の厚鋼板幅４３０
０ｍｍ、長さ１８ｍ、板厚４０ｍｍ、初期温度８４０℃
の厚鋼板を速度５ｍｐｍで通過させて冷却を施した。冷
却後復熱した段階での各部の温度は５００±１５℃で、
特に板後端で冷却不足は生じていなかった。この鋼板は
冷却床で常温まで冷却されたが反り等の歪みは全く発生
しなかった。また、板長手方向の硬度を測定したが特に
焼きムラはなく均一な硬度分布であり材質のバラツキが
少なかった。従って材質の規格外れによる板後端部の格
下げはなく、製品歩留まりは１００％であった。In this cooling device, a steel plate width 430 immediately after rolling is applied.
0mm, length 18m, thickness 40mm, initial temperature 840 ° C
At a speed of 5 mpm for cooling. The temperature of each part at the stage of reheating after cooling is 500 ± 15 ° C,
In particular, insufficient cooling did not occur at the rear end of the plate. This steel sheet was cooled to room temperature on the cooling floor, but no distortion such as warpage occurred. The hardness in the longitudinal direction of the plate was measured. As a result, there was no unevenness in the firing, the hardness distribution was uniform, and there was little variation in the material. Therefore, there was no downgrade of the rear end of the plate due to the material being out of specification, and the product yield was 100%.
【００３３】（比較例）実施例と同じ冷却装置を用い、
上流側スリットノズル４のみを用いて鋼板１の全範囲に
わたって冷却を行った。その他の条件は、実施例と同一
とした。(Comparative Example) Using the same cooling device as in the example,
Cooling was performed over the entire range of the steel sheet 1 using only the upstream slit nozzle 4. Other conditions were the same as those of the example.
【００３４】冷却後復熱した段階での鋼板各部の温度は
５００〜５７０℃で特に板後端で冷却不足が生じてお
り、後端部は５７０℃であった。冷却後、板長手方向の
硬度を測定したところ板後端は焼きムラによる硬度の低
い部分が存在しており、材質のバラツキが大きかった。
その結果、板後端部分で材質の規格外れが発生し、0.56
ｍを切り捨てる必要があった。製品歩留まりは９７％で
あった。The temperature of each part of the steel sheet at the stage of recuperation after cooling was 500 to 570 ° C., especially at the rear end of the steel sheet, where cooling was insufficient, and the rear end was 570 ° C. After cooling, the hardness in the longitudinal direction of the plate was measured. As a result, the rear end of the plate had a portion with low hardness due to uneven baking, and the material had large variations.
As a result, the material was out of specification at the rear end of the plate,
m had to be truncated. The product yield was 97%.
【００３５】[0035]
【発明の効果】以上説明したように、本発明において
は、鋼板の先端が冷却設備を通過するときは、鋼板搬送
方向上流側の上拘束ロールの下流側近傍に設置された第
１のスリットノズルから冷却水が供給されるので、鋼板
の先端部から冷却を開始することができる。鋼板の後端
部が冷却設備を通過するときは、鋼板搬送方向下流側の
上拘束ロールの上流側近傍に設置された第２のスリット
ノズルからの冷却水が鋼板上に供給されるので、鋼板の
後端部を有効に冷却することができる。As described above, according to the present invention, when the tip of the steel sheet passes through the cooling equipment, the first slit nozzle installed near the downstream side of the upper constraining roll on the upstream side in the sheet conveying direction. Since the cooling water is supplied from the cooling device, the cooling can be started from the tip of the steel plate. When the rear end of the steel sheet passes through the cooling equipment, the cooling water from the second slit nozzle installed near the upstream side of the upper constraining roll on the downstream side in the sheet conveying direction is supplied onto the steel sheet. Can effectively cool the rear end.
【００３６】よって、鋼板先後端部とも均一に冷却する
ことが可能になるので、鋼板長手方向の焼きムラから生
じる材質欠陥がなくなり、製品の歩留まりが向上する。Accordingly, the front and rear ends of the steel sheet can be uniformly cooled, so that there is no material defect caused by unevenness in the longitudinal direction of the steel sheet, and the yield of the product is improved.
【図１】本発明の実施の形態にかかる設備の例を説明す
る概略図である。FIG. 1 is a schematic diagram illustrating an example of equipment according to an embodiment of the present invention.
【図２】本発明の実施の形態である冷却方法の例を説明
する図である。FIG. 2 is a diagram illustrating an example of a cooling method according to an embodiment of the present invention.
１ 鋼板 ２ 上ロール ３ 下ロール ４ 上流側スリットノズル ５ ヘッダ ６ スカート部 ７ 下流側スリットノズル ８ ヘッダ ９ スカート部 １０ 冷却水遮断弁 １１ 冷却水遮断弁 １２ 冷却水本管 １３ 円管ノズル DESCRIPTION OF SYMBOLS 1 Steel plate 2 Upper roll 3 Lower roll 4 Upstream slit nozzle 5 Header 6 Skirt part 7 Downstream slit nozzle 8 Header 9 Skirt part 10 Cooling water shutoff valve 11 Cooling water shutoff valve 12 Cooling water main pipe 13 Round pipe nozzle
───────────────────────────────────────────────────── フロントページの続き (72)発明者 藤田 米章 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 Continued on the front page (72) Inventor Yoneaki Fujita 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Kokan Co., Ltd.
Claims (2)
拘束しながら搬送し、搬送途中において鋼板に上下から
冷却水を注水して高温鋼板を冷却する高温鋼板の冷却方
法であって、冷却水を鋼板搬送方向下流側に向かって鋼
板の上表面に沿って吐出する第１のスリットノズルを鋼
板搬送方向上流側の上拘束ロールの下流側近傍に、冷却
水を鋼板搬送方向上流側に向かって鋼板の上表面に沿っ
て吐出する第２のスリットノズルを鋼板搬送方向下流側
の上拘束ロールの上流側近傍に、それぞれ設けておき、
鋼板の先端部分を冷却するときは、第１のスリットノズ
ルを使用し、鋼板の後端部分を冷却するときは第２のス
リットノズルを使用することを特徴とする高温鋼板の冷
却方法。1. A method for cooling a high-temperature steel sheet by conveying a high-temperature steel sheet while constraining the high-temperature steel sheet by a plurality of sets of upper and lower restraint rolls, and cooling the high-temperature steel sheet by injecting cooling water into the steel sheet from above and below during the conveyance. A first slit nozzle for discharging water along the upper surface of the steel sheet toward the downstream side in the steel sheet transport direction is provided near the downstream side of the upper restraining roll on the upstream side in the steel sheet transport direction, and the cooling water is directed toward the upstream side in the steel sheet transport direction. A second slit nozzle for discharging along the upper surface of the steel sheet is provided in the vicinity of the upstream side of the upper restraining roll on the downstream side in the steel sheet conveyance direction, respectively,
A method for cooling a high-temperature steel sheet, comprising: using a first slit nozzle when cooling a front end portion of a steel sheet; and using a second slit nozzle when cooling a rear end portion of the steel sheet.
流側近傍に設けられ、冷却水を鋼板搬送方向下流側に向
かって鋼板の上表面に沿って吐出する第１のスリットノ
ズルと、鋼板搬送方向下流側の上拘束ロールの上流側近
傍に設けられ、冷却水を鋼板搬送方向上流側に向かって
鋼板の上表面に沿って吐出する第２のスリットノズルと
を有してなる高温鋼板の冷却装置。2. A first slit nozzle which is provided near the downstream side of the upper constraining roll on the upstream side in the steel sheet transport direction and discharges cooling water along the upper surface of the steel sheet toward the downstream side in the steel sheet transport direction; A second slit nozzle which is provided near the upstream side of the upper constraining roll on the downstream side in the transport direction and discharges cooling water along the upper surface of the steel sheet toward the upstream side in the transport direction of the steel sheet. Cooling system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11416697A JP3189732B2 (en) | 1997-04-17 | 1997-04-17 | Cooling method for hot steel sheet and cooling device for hot steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11416697A JP3189732B2 (en) | 1997-04-17 | 1997-04-17 | Cooling method for hot steel sheet and cooling device for hot steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10291021A true JPH10291021A (en) | 1998-11-04 |
| JP3189732B2 JP3189732B2 (en) | 2001-07-16 |
Family
ID=14630831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11416697A Expired - Fee Related JP3189732B2 (en) | 1997-04-17 | 1997-04-17 | Cooling method for hot steel sheet and cooling device for hot steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3189732B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007090428A (en) * | 2005-08-30 | 2007-04-12 | Jfe Steel Kk | Equipment and method for hot-rolling steel sheet |
| JP2007203369A (en) * | 2005-08-30 | 2007-08-16 | Jfe Steel Kk | Cooling facility and cooling method of steel plate |
| JP2007203370A (en) * | 2005-08-30 | 2007-08-16 | Jfe Steel Kk | Cooling facility and cooling method of steel plate |
| EP1935522A1 (en) * | 2005-08-30 | 2008-06-25 | JFE Steel Corporation | Cooling facility and cooling method of steel plate |
| JP2008200708A (en) * | 2007-02-20 | 2008-09-04 | Jfe Steel Kk | Facilities and method for manufacturing thick steel plate |
-
1997
- 1997-04-17 JP JP11416697A patent/JP3189732B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007090428A (en) * | 2005-08-30 | 2007-04-12 | Jfe Steel Kk | Equipment and method for hot-rolling steel sheet |
| JP2007203369A (en) * | 2005-08-30 | 2007-08-16 | Jfe Steel Kk | Cooling facility and cooling method of steel plate |
| JP2007203370A (en) * | 2005-08-30 | 2007-08-16 | Jfe Steel Kk | Cooling facility and cooling method of steel plate |
| EP1935522A1 (en) * | 2005-08-30 | 2008-06-25 | JFE Steel Corporation | Cooling facility and cooling method of steel plate |
| EP1935522A4 (en) * | 2005-08-30 | 2011-05-11 | Jfe Steel Corp | Cooling facility and cooling method of steel plate |
| JP2008200708A (en) * | 2007-02-20 | 2008-09-04 | Jfe Steel Kk | Facilities and method for manufacturing thick steel plate |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3189732B2 (en) | 2001-07-16 |
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