JP2007136501A - Controlled cooling apparatus for steel plate, and cooling method - Google Patents

Controlled cooling apparatus for steel plate, and cooling method Download PDF

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JP2007136501A
JP2007136501A JP2005332970A JP2005332970A JP2007136501A JP 2007136501 A JP2007136501 A JP 2007136501A JP 2005332970 A JP2005332970 A JP 2005332970A JP 2005332970 A JP2005332970 A JP 2005332970A JP 2007136501 A JP2007136501 A JP 2007136501A
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Hironori Ueno
博則 上野
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Nippon Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for cooling a steel plate by which a thick steel plate can be cooled uniformly without causing any warping over its entire length in a controlled cooling process. <P>SOLUTION: In this method, the steel plate is hot-rolled, and then cooled by using cooling nozzles which have many nozzle holes and spray two fluids of air and water individually or simultaneously in a method for cooling the steel plate in high-temperature state from the upper and lower surfaces of the steel plate by conveying the plate while restraining the steel plate of high temperature after rolling with a plurality of sets of upper and lower dewatering rolls. When the supplied water is small in water quantity or low in water pressure, a stable spray pattern is obtained by excluding the air which is able to enter the flow passages which reach the tip of a cooling equipment. The equipment for performing the above method is a steel plate cooling equipment comprising an outer header having a supplying system of air, a lot of air jetting nozzles lined up and arranged on the air jetting surface of this header, an inner header having the supplying system of cooling water, and a lot of cooling water jetting nozzles lined up and arranged on the cooling water jetting surface of the header. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、鋼板の冷却制御方法に係り、特に、熱間圧延を行った後、高温状態にある鋼板を上下方向から水冷却するに際して使用する鋼板の冷却制御装置およびその方法に関する。   The present invention relates to a steel sheet cooling control method, and more particularly, to a steel sheet cooling control apparatus and method used when water-cooling a steel sheet in a high temperature state from the vertical direction after hot rolling.

近年、鉄鋼用材料に関する品質要求は板厚精度、材質、表面品位等ますます厳格化しており、特に厚鋼板製造の場合においては、合金成分の削減と、熱処理工程の簡略化等を意図したオンライン制御による冷却制御プロセスが採用され実施されている。このオンライン制御による冷却制御プロセスは、熱間圧延後、高温状態にある厚鋼板を直ちに、又は十数秒後に所定の冷却速度で所定の冷却停止温度まで制御冷却することにより、高価な合金成分の含有量を少なくしながら、目的とする強度、靭性、剛性を得ようとするものである。通常、このプロセスでは冷却水量、水冷時間を調整することで、それぞれの冷却速度、冷却停止温度が制御される。   In recent years, quality requirements for steel materials have become increasingly stringent, such as plate thickness accuracy, material quality, and surface quality. Especially in the case of thick steel plate manufacturing, online content intended to reduce alloy components and simplify heat treatment processes. A controlled cooling control process is adopted and implemented. This on-line cooling control process is a method of containing expensive alloy components by hot-rolling a thick steel plate in a high temperature state immediately or after a tens of seconds at a predetermined cooling rate to a predetermined cooling stop temperature. It is intended to obtain the desired strength, toughness and rigidity while reducing the amount. Normally, in this process, the cooling rate and the cooling stop temperature are controlled by adjusting the cooling water amount and the water cooling time.

上述した制御冷却に用いる装置としては、一般にスリットジェット冷却法、マルチミストジェット冷却法が採用されているが、狭い冷却有効面積、常時数ミリ程度の板幅方向でのスリット間隔の維持、更には適用場所などの問題がある。水量の広範囲な制御範囲をもつ気水冷却ノズルが広く採用されつつあるが、鋼板の安全かつ均一な冷却のためには高密度なノズル配列をもつことが望ましいが、ノズル構成かつ複雑化するためボックス型の冷却装置とする必要がある。このボックス型の冷却装置は、水あるいは空気のヘッダーから直接、複数のノズルに水や空気を供給するタイプのノズルで構造かつ簡単であるという利点がある。このようなボックス型の冷却装置のノズル構成として、特許文献１に開示されているように、各々独立した冷却水の給水系を有する外側／内側ヘッダーからなる冷却装置の外側ヘッダーの冷却水噴射面に所定角度の絞り部を有する末広がりノズルを多数整列配置させ、内側ヘッダーには環状衝突流を生じるように先端部が先細曲面を有するノズルを多数整列配置させる装置や、特許文献２に開示されているように、直射流と斜行流を同時にスプレーする末広がり状のノズルの吐出口におけるオリフィス径を直射流導入口のオリフィス径より小さくし、かつ斜行流の導入口を先細状とすることで直射流の圧力と先細状斜行流の圧力が同圧の条件でも良好な冷却性能が得られる方法が提案されている。   In general, the slit jet cooling method and the multi-mist jet cooling method are employed as the devices used for the controlled cooling described above. However, the narrow cooling effective area, the maintenance of the slit interval in the plate width direction of about several millimeters at all times, and There are problems such as application location. Air-water cooling nozzles with a wide control range of water volume are being widely adopted, but it is desirable to have a high-density nozzle array for safe and uniform cooling of the steel sheet, but this makes the nozzle configuration and complexity complicated. It is necessary to use a box-type cooling device. This box-type cooling device has the advantage of being simple and structured with a nozzle that supplies water and air to a plurality of nozzles directly from a water or air header. As a nozzle configuration of such a box-type cooling device, as disclosed in Patent Document 1, a cooling water injection surface of an outer header of a cooling device including outer / inner headers each having an independent cooling water supply system A device in which a large number of divergent nozzles having a narrowed portion at a predetermined angle are arranged in an array and a large number of nozzles having a tapered surface at the tip so as to generate an annular collision flow is arranged on the inner header, and disclosed in Patent Document 2 As shown in the figure, the orifice diameter of the divergent nozzle that sprays direct and oblique flow simultaneously is made smaller than the orifice diameter of the direct flow introduction port, and the oblique flow introduction port is tapered. A method has been proposed in which good cooling performance can be obtained even when the direct flow pressure and the tapered oblique flow pressure are the same.

実願昭６２−４３８６号公報Japanese Utility Model Publication No. 62-4386 実開平１−１３５１０８号公報Japanese Utility Model Publication No. 1-135108

しかしながら、空気量を絞るとミストスプレーが不安定となり所望の冷却パターンを維持しえないという問題がある。特に、供給水圧が低位となった場合においては空気が水の流通路に侵入し、ミストスプレーが不安定となる、いわゆる「息つぎ」現象が発生し、冷却が非常に不安定なものとなってしまう。   However, if the amount of air is reduced, the mist spray becomes unstable and there is a problem that a desired cooling pattern cannot be maintained. In particular, when the supply water pressure becomes low, air enters the water flow path, and the mist spray becomes unstable, so-called “breathing” phenomenon occurs, and cooling becomes very unstable. End up.

本発明は、熱間圧延後の鋼板の冷却方法において、供給する水が低水量または低水圧である場合においても冷却装置先端に到達する流路に浸入しうる空気を排除することで安定した噴霧パターンが得られる鋼板の冷却装置とそれを使用した冷却方法を提供するものである。   In the method for cooling a steel sheet after hot rolling, the present invention provides a stable spray by eliminating air that can enter the flow path reaching the tip of the cooling device even when the supplied water has a low water volume or low water pressure. The present invention provides a cooling device for a steel plate from which a pattern can be obtained and a cooling method using the same.

本発明は、上記課題を解決するためになされたもので、その要旨は次のとおりである。
（１）空気と水とを混合して噴霧して鋼板を冷却する冷却装置であって、該冷却装置は、空気を供給する空気ヘッダーと、この空気ヘッダーに接続され、上部に空気導入口を、胴部に冷却水導入口を、下部に空気及び水を噴霧する吐出孔を有する複数のノズルと、
且つ、前記ノズルの水導入口の周囲が水ヘッダーを形成し、当該水ヘッダーへ水を供給する配管の供給口の高さが前記ノズルの水導入部の高さよりも低く設定され、更に、前記水の供給配管の途中にエア抜き弁を設けたことを特徴とする鋼板の制御冷却装置。
（２）（１）記載の制御冷却装置を使用し、鋼板の冷却を開始する際に、まず、前記ノズルに空気を流通し、次に前記エア抜き弁を開とし、ほぼ同時に前記水ヘッダーに水を供給し、主に配管中のエアを抜いて、その後、エア抜き弁を閉とすることを特徴とする鋼板の冷却方法。
（３）（１）記載の制御冷却装置を使用し、鋼板を冷却を終了し、空気及び水の鋳通を停止する際に、まず、水の流通を停止し、その後、空気の流通を停止することを特徴とする鋼板の冷却方法。 The present invention has been made to solve the above-described problems, and the gist thereof is as follows.
(1) A cooling device that mixes and sprays air and water to cool a steel sheet, and the cooling device is connected to the air header for supplying air, and has an air inlet at the top. A plurality of nozzles having cooling water inlets in the body and discharge holes for spraying air and water in the lower part;
And the periphery of the water inlet of the nozzle forms a water header, the height of the supply port of the pipe for supplying water to the water header is set lower than the height of the water inlet of the nozzle, and A controlled cooling device for a steel sheet, wherein an air vent valve is provided in the middle of a water supply pipe.
(2) When using the control cooling device described in (1) and starting cooling of the steel sheet, first, air is circulated through the nozzle, then the air vent valve is opened, and almost simultaneously with the water header. A method for cooling a steel sheet, characterized in that water is supplied, mainly air in a pipe is extracted, and then an air release valve is closed.
(3) When the control cooling device described in (1) is used, the cooling of the steel plate is finished, and when the casting of air and water is stopped, the flow of water is stopped first, and then the flow of air is stopped. A method for cooling a steel sheet, comprising:

本発明により、厚鋼板の制御冷却において鋼板全長にわたり板反りがない均一冷却を行うことができる。   According to the present invention, uniform cooling with no warpage can be performed over the entire length of the steel plate in the controlled cooling of the thick steel plate.

先ず、本発明を実施するための鋼板の冷却装置の概要を説明する。   First, an outline of a steel sheet cooling apparatus for carrying out the present invention will be described.

図１は本発明による空気／水の２流体による冷却装置の概略構成図である。図１において、冷却パスライン上にある被冷却鋼板Ａの上部に配置された冷却装置本体１は支持装置２に支承され、この支持装置２には空気ヘッダー３と水ヘッダー４を内設し、空気ヘッダー３の空気噴射面に多数整列配置された空気供給配管５を設置し、水ヘッダーの冷却水噴射面に多数整列配管された冷却水噴射ノズル６が設置されている。この噴射ノズルは図３に示すように、上部に空気の導入口１２があり、その胴部１０には、水の導入口１３がある。そして、ノズル内で空気と水が混合され、ノズル下部にある噴射孔から噴霧される。また、空気ヘッダー３の空気噴射面には空気溜まりができ、また、水ヘッダー４の冷却水噴射ノズル６の周囲には冷却水溜まりができる。水ヘッダー４に冷却水を供給する冷却水供給配管７があり、この配管の出口の高さは、噴射ノズル６胴部の水の導入口よりも低い位置となる。それは、水を停止した際に、水ヘッダー内は噴射ノズル胴部の水の導入口より上は空気が充満するが、その範囲に冷却水供給配管の出口があると、配管内の水が、水ヘッダー内に供給され、その水が更にノズルから流出する為、冷却水停止の際の応答性悪くなるので、それを避ける為に、配管出口が常に水に浸漬する、噴射ノズル胴部の水の導入口より下に配置している。   FIG. 1 is a schematic configuration diagram of a cooling device using two air / water fluids according to the present invention. In FIG. 1, a cooling device main body 1 disposed on an upper portion of a steel plate A to be cooled on a cooling path line is supported by a support device 2, and an air header 3 and a water header 4 are provided in the support device 2. A large number of aligned air supply pipes 5 are installed on the air injection surface of the air header 3, and a large number of aligned cooling water injection nozzles 6 are installed on the cooling water injection surface of the water header. As shown in FIG. 3, this spray nozzle has an air inlet 12 at the top, and a water inlet 13 at its body 10. Then, air and water are mixed in the nozzle and sprayed from the injection hole in the lower part of the nozzle. Further, an air pool can be formed on the air injection surface of the air header 3, and a cooling water pool can be formed around the cooling water injection nozzle 6 of the water header 4. There is a cooling water supply pipe 7 for supplying cooling water to the water header 4, and the height of the outlet of this pipe is lower than the water inlet of the body of the injection nozzle 6. When the water is stopped, the water header is filled with air above the water inlet of the jet nozzle body, but if there is an outlet of the cooling water supply pipe in that range, the water in the pipe will be Since the water is supplied into the water header and the water further flows out from the nozzle, the responsiveness when the cooling water stops is deteriorated. To avoid this, the water in the injection nozzle body is always immersed in the water at the piping outlet. It is arranged below the introduction port.

また、冷却水供給配管７の途中には、エア抜き弁８を設ける。これによって配管内に侵入したエアをスムーズに排出する。従来の空気／水の２流体による冷却装置では、空気供給系から送られる空気量および空気圧と、冷却水供給系から送られる冷却水量および冷却水圧を予め設定された冷却速度に応じて調整され、均一冷却が行われるよう制御されている。   An air vent valve 8 is provided in the middle of the cooling water supply pipe 7. This smoothly discharges the air that has entered the pipe. In the conventional cooling device with two air / water fluids, the air amount and air pressure sent from the air supply system, and the cooling water amount and cooling water pressure sent from the cooling water supply system are adjusted according to a preset cooling rate, Control is performed so that uniform cooling is performed.

しかしながら、前述したように、供給する水が低水量または低水圧になるという異常事態が生じた場合には、冷却水への空気の混合比率が高くなり、空気の消費量が多くなりランニングコストが嵩み、また空気量を絞るとミストスプレーが不安定となり所望の冷却パターンを維持しえないという問題がある。特に、供給水圧が低位となった場合においては空気が水の流通路に侵入し、ミストスプレーが不安定となる、いわゆる「息つぎ」現象が発生し、冷却が非常に不安定なものとなってしまう。このような事態に対しては、空気供給系の大本で供給空気量とその圧力を制御すればよいが、それには大きなタイムラグが生じ、結果的には過剰空気量となって不均一冷却が起こる。   However, as described above, when an abnormal situation occurs in which the supplied water has a low water volume or a low water pressure, the mixing ratio of air to the cooling water increases, the air consumption increases, and the running cost increases. When the air volume is reduced, the mist spray becomes unstable and the desired cooling pattern cannot be maintained. In particular, when the supply water pressure becomes low, air enters the water flow path, and the mist spray becomes unstable, so-called “breathing” phenomenon occurs, and cooling becomes very unstable. End up. For such a situation, it is sufficient to control the supply air amount and its pressure with a main air supply system, but this causes a large time lag, resulting in excessive air amount and uneven cooling. Occur.

そこで、本発明においては、このような事態が生じた場合には、冷却装置、すなわちノズル先端に到達する流路に侵入する空気を排除し、冷却水と空気の混合比率を一定とするよう制御する。その具体的制御手順としては、図２の制御フローに示したように、まず図１に示す冷却装置本体に直結させた流体ノズル制御機構（図示せず）の初期設定で、冷却水流量＝０、空気流量＝０とし、空気抜き弁を閉としておく。ついで、空気流量設定値を変更して空気流量を定常状態に設定する。その後、冷却水流量を設定するに際しては、空気抜き弁を開とし、同時に冷却水流量を定常状態に設定し、水の供給配管〜水ヘッダーまでの空気が抜けてノズルからの噴霧状態が安定して空気抜き弁を閉める。この間の時間の確保はタイマーを使用しても良い。この状態で鋼板の冷却を開始し、定常状態での鋼板冷却制御が実施される。   Therefore, in the present invention, when such a situation occurs, control is performed so as to eliminate the air entering the cooling device, that is, the flow path reaching the nozzle tip, and to keep the mixing ratio of the cooling water and air constant. To do. As a specific control procedure, as shown in the control flow of FIG. 2, first, the initial setting of the fluid nozzle control mechanism (not shown) directly connected to the cooling device main body shown in FIG. The air flow rate is set to 0 and the air vent valve is closed. Next, the air flow rate setting value is changed to set the air flow rate to a steady state. After that, when setting the cooling water flow rate, open the air vent valve and set the cooling water flow rate to a steady state at the same time, the air from the water supply pipe to the water header escapes, and the spray state from the nozzle is stable Close the air vent valve. A timer may be used to secure the time during this period. In this state, cooling of the steel sheet is started, and steel sheet cooling control in a steady state is performed.

そして、鋼板の冷却が終了したら、まず、水の流通を停止し、その後空気の流通を停止する。もし、水と空気を同時に停止すると、空気ヘッダー側に水が逆流し、空気の流通経路に水が侵入し、錆などの問題が発生するからである。つまり、冷却水流量を一旦ゼロ（０）とし、この時点で空気流量がゼロ（０）とするような操作を行うと空気室（空気溜り）に冷却水が逆流し、ノズル詰まりが起きるので通常冷却水供給系をタイマーで調整して空気流量をゼロ（０）とする操作を行う。   And if cooling of a steel plate is complete | finished, the distribution | circulation of water will be stopped first and the distribution | circulation of air will be stopped after that. If water and air are stopped at the same time, water flows backward to the air header side, water enters the air flow path, and problems such as rust occur. In other words, if the cooling water flow rate is once set to zero (0) and the air flow rate is set to zero (0) at this time, the cooling water flows back into the air chamber (air reservoir) and nozzle clogging usually occurs. The cooling water supply system is adjusted with a timer to make the air flow rate zero (0).

本発明による鋼板冷却装置の概略構成図である。It is a schematic block diagram of the steel plate cooling device by this invention. 本発明による鋼板冷却方法の制御フローを示す図である。It is a figure which shows the control flow of the steel plate cooling method by this invention. 本発明による鋼板冷却装置に用いる噴射ノズルの概略構成図である。It is a schematic block diagram of the injection nozzle used for the steel plate cooling device by this invention.

Claims (3)

空気と水とを混合して噴霧して鋼板を冷却する冷却装置であって、該冷却装置は、空気を供給する空気ヘッダーと、この空気ヘッダーに接続され、上部に空気導入口を、胴部に冷却水導入口を、下部に空気及び水を噴霧する吐出孔を有する複数のノズルと、
且つ、前記ノズルの水導入口の周囲が水ヘッダーを形成し、当該水ヘッダーへ水を供給する配管の供給口の高さが前記ノズルの水導入部の高さよりも低く設定され、更に、前記水の供給配管の途中にエア抜き弁を設けたことを特徴とする鋼板の制御冷却装置。 A cooling device that mixes and sprays air and water to cool a steel sheet, the cooling device being connected to the air header for supplying air, an air inlet at the top, and a body portion A plurality of nozzles having discharge holes for spraying air and water at the bottom;
And the periphery of the water inlet of the nozzle forms a water header, the height of the supply port of the pipe for supplying water to the water header is set lower than the height of the water inlet of the nozzle, and A controlled cooling device for a steel sheet, wherein an air vent valve is provided in the middle of a water supply pipe. 請求項１記載の制御冷却装置を使用し、鋼板の冷却を開始する際に、まず、前記ノズルに空気を流通し、次に前記エア抜き弁を開とし、ほぼ同時に前記水ヘッダーに水を供給し、主に配管中のエアを抜いて、その後、エア抜き弁を閉とすることを特徴とする鋼板の冷却方法。   When using the control cooling device according to claim 1 to start cooling the steel sheet, first, air is circulated through the nozzle, then the air vent valve is opened, and water is supplied to the water header almost simultaneously. And the cooling method of the steel plate characterized by mainly extracting the air in piping, and closing an air bleeding valve after that. 請求項１記載の制御冷却装置を使用し、鋼板を冷却を終了し、空気及び水の流通を停止する際に、まず、水の流通を停止し、その後、空気の流通を停止することを特徴とする鋼板の冷却方法。   When the controlled cooling device according to claim 1 is used and cooling of the steel sheet is finished and the flow of air and water is stopped, the flow of water is stopped first, and then the flow of air is stopped. A method for cooling a steel sheet.
JP2005332970A 2005-11-17 2005-11-17 Steel sheet controlled cooling device and cooling method Expired - Fee Related JP4377873B2 (en)

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CN102189119A (en) * 2011-04-13 2011-09-21 南京钢铁股份有限公司 Process for controlling shape of hot-rolled flat-rolled high-grade pipeline steel plate by using single-rack steckel mill
CN102266866A (en) * 2011-07-12 2011-12-07 南京钢铁股份有限公司 Technology for producing hot-rolled pipeline steel of roll mill with single frame furnace
CN103042054A (en) * 2013-01-25 2013-04-17 中冶赛迪工程技术股份有限公司 Cooling and bending preventing device for specially-shaped steel and process method
CN104624424A (en) * 2015-01-30 2015-05-20 中冶南方(武汉)威仕工业炉有限公司 Air-vapor cooling device for strip steel cooling
CN105695705A (en) * 2014-11-28 2016-06-22 宝山钢铁股份有限公司 Basic automatic rolled steel plate rapid cooling system for online solid solution treatment
JP6472563B1 (en) * 2018-07-10 2019-02-20 中外炉工業株式会社 Metal strip cooling device
JP2021514846A (en) * 2018-02-26 2021-06-17 エス・エム・エス・グループ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング Cooling device that cools the article to be cooled

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102189119A (en) * 2011-04-13 2011-09-21 南京钢铁股份有限公司 Process for controlling shape of hot-rolled flat-rolled high-grade pipeline steel plate by using single-rack steckel mill
CN102266866A (en) * 2011-07-12 2011-12-07 南京钢铁股份有限公司 Technology for producing hot-rolled pipeline steel of roll mill with single frame furnace
CN103042054A (en) * 2013-01-25 2013-04-17 中冶赛迪工程技术股份有限公司 Cooling and bending preventing device for specially-shaped steel and process method
CN105695705A (en) * 2014-11-28 2016-06-22 宝山钢铁股份有限公司 Basic automatic rolled steel plate rapid cooling system for online solid solution treatment
CN104624424A (en) * 2015-01-30 2015-05-20 中冶南方(武汉)威仕工业炉有限公司 Air-vapor cooling device for strip steel cooling
JP2021514846A (en) * 2018-02-26 2021-06-17 エス・エム・エス・グループ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング Cooling device that cools the article to be cooled
JP7018145B2 (en) 2018-02-26 2022-02-15 エス・エム・エス・グループ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング Cooling device that cools the article to be cooled
JP6472563B1 (en) * 2018-07-10 2019-02-20 中外炉工業株式会社 Metal strip cooling device
JP2020006417A (en) * 2018-07-10 2020-01-16 中外炉工業株式会社 Cooling device of metal strip

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