JP2008246488A - Method of cooling steel and apparatus for it - Google Patents

Method of cooling steel and apparatus for it Download PDF

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JP2008246488A
JP2008246488A JP2007087261A JP2007087261A JP2008246488A JP 2008246488 A JP2008246488 A JP 2008246488A JP 2007087261 A JP2007087261 A JP 2007087261A JP 2007087261 A JP2007087261 A JP 2007087261A JP 2008246488 A JP2008246488 A JP 2008246488A
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cooling
water
steel material
nozzle
water leakage
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JP4918876B2 (en
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Makoto Nakaseko
誠 中世古
Teruo Fujibayashi
晃夫 藤林
Noribumi Hori
紀文 堀
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JFE Steel Corp
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JFE Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of cooling steel and an apparatus for it by which the quality in TMCP (temperature control rolling process) rolling is improved by preventing the water leakage from a nozzle. <P>SOLUTION: A leakage preventing apparatus 43 which is operated by water pressure is provided every a plurality of cooling nozzles 42 and just near them. Where, the nozzle is expressed by 42 and a jet hole by 421. A valve seat 431, a valve element 432, a balancing spring 433 and a spring seat 434 are incorporated in the inside of a cylinder in this order from the upstream side. By adjusting the position of the spring seat or the spring force of the balancing spring, the valve element is pressed against the valve seat and the stream is interrupted when the water pressure which acts from the upper part of the Figure is lower than a prescribed value and the valve element is parted from the valve seat and water flows when the water pressure which overcomes the spring force acts. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、熱間圧延された鋼材の冷却方法およびその装置に関する。   The present invention relates to a method and an apparatus for cooling a hot-rolled steel material.

近年、厚板等の熱間圧延鋼材に対して、冷却温度や冷却速度を制御する温度制御圧延プロセス（ＴＭＣＰ，Thermo-mechanical Controlled Processing）により材料に強度や靱性を付与することが行われている。制御圧延（制御冷却）における最初の温度範囲は７００〜１０００℃とかなり高温であるため、冷却媒体としては通常、水が使用される。冷却のやり方としては、配管の先端に取り付けたノズルから鋼材の上下面に向けて冷却水を噴射するのが普通である。冷却を行う時間は短いほど生産性が高いので、冷却水の量は増加の傾向にある。   In recent years, hot rolled steel materials such as thick plates have been given strength and toughness to materials by a temperature-controlled rolling process (TMCP, Thermo-mechanical Controlled Processing) that controls the cooling temperature and cooling rate. . Since the initial temperature range in the controlled rolling (controlled cooling) is as high as 700 to 1000 ° C., water is usually used as the cooling medium. As a cooling method, cooling water is usually sprayed from the nozzle attached to the end of the pipe toward the upper and lower surfaces of the steel material. Since the productivity is higher as the cooling time is shorter, the amount of cooling water tends to increase.

厚板製造設備の一例を図３に示す。１は素材であるスラブを加熱する加熱炉、２は加熱によってスラブの表面に生成されたスケール（酸化皮膜）を除去するスケールブレーカ、３は第１の圧延機、４は前記の温度制御圧延プロセスを実行する制御冷却装置、５は第２の圧延機、６は２次冷却装置、７は矯正機（レベラ）である。
制御冷却装置４における冷却水配管の一例を図４に示す。４１は鋼材の幅方向に設けられたヘッダ、４２は各ヘッダにほぼ等間隔に取り付けられたノズル、４４は配管、４５は流量調整機能付きの遮断弁である。例えば１本のヘッダ４１は長さが約５ｍで、鋼材の長さ方向に３ｍ間隔に複数本設けられ、これが配管４４にまとめられ、１基の遮断弁４５により冷却水の噴射、停止が行われる。ノズル４２の１個当たりの水量は毎分例えば５０〜２００リッター程度である。 An example of the plate manufacturing equipment is shown in FIG. DESCRIPTION OF SYMBOLS 1 is the heating furnace which heats the slab which is a raw material, 2 is a scale breaker which removes the scale (oxide film) produced | generated on the surface of the slab by heating, 3 is a 1st rolling mill, 4 is said temperature control rolling process Is a control cooling device for executing the above, 5 is a second rolling mill, 6 is a secondary cooling device, and 7 is a straightening machine (leveler).
An example of the cooling water piping in the control cooling device 4 is shown in FIG. 41 is a header provided in the width direction of the steel material, 42 is a nozzle attached to each header at approximately equal intervals, 44 is a pipe, and 45 is a shut-off valve with a flow rate adjusting function. For example, one header 41 has a length of about 5 m, and a plurality of headers 41 are provided at intervals of 3 m in the length direction of the steel material. These are integrated into a pipe 44 and one shutoff valve 45 is used to inject and stop cooling water. Is called. The amount of water per nozzle 42 is, for example, about 50 to 200 liters per minute.

遮断弁４５により冷却水の噴射を停止しても、鋼材の下面側では別に問題はないが、遮断弁４５からノズル４２までにかなりの距離があるので、上面側ではこの間の配管内の残留水がノズル４２からしばらく滴下し続ける。この現象を「水漏れ」と称する。その時間は時におよそ３０秒にも達する。
制御冷却では、板厚が５０ｍｍ程度にまで薄くなっていることが多いので、残留水や水漏れの影響を受けやすい。とくに熱間圧延中の鋼材が冷却装置の位置で停止、あるいは揺動しているため、水漏れがあると鋼材が局部的に、あるいは長手方向に筋状に過冷却されるという現象が発生する。図５は鋼材の幅方向の表面の温度分布の例を示すグラフである。熱間圧延中に制御冷却によって表面平均温度が９２０℃から８５０℃まで低下した後、ノズルからは約３０秒間にわたって水漏れが続いたため、ノズルの位置ごとに４０〜１００℃の温度低下が認められ、過冷却部分が発生している。 Even if the injection of the cooling water is stopped by the shut-off valve 45, there is no problem on the lower surface side of the steel material. However, since there is a considerable distance from the shut-off valve 45 to the nozzle 42, the remaining water in the pipe during this time is on the upper face side. Continues to drip from the nozzle 42 for a while. This phenomenon is called “water leakage”. The time sometimes reaches about 30 seconds.
In controlled cooling, the plate thickness is often as thin as about 50 mm, so that it is easily affected by residual water and water leakage. In particular, since the steel material being hot-rolled stops or swings at the position of the cooling device, if there is a water leak, a phenomenon occurs in which the steel material is supercooled locally or longitudinally in a streak shape. . FIG. 5 is a graph showing an example of the temperature distribution on the surface in the width direction of the steel material. After the surface average temperature decreased from 920 ° C. to 850 ° C. by controlled cooling during hot rolling, the nozzle continued to leak for about 30 seconds, so a temperature decrease of 40-100 ° C. was observed for each nozzle position. A supercooled part has occurred.

水漏れは、例えば遮断弁４５を各ノズル４２毎にその近傍に設ければ解決するが、ノズルの周辺は高温、かつ水しぶきがかかる場所で電気・電子作動の機器が設置できないばかりでなく、電磁式の弁でも水が完全に止まるまでに約５秒かかり、さらに弁の大きさや価格などを考慮すると、ノズル毎にこのようなものを取り付けることは現実的でない。
特許文献１、特許文献２には、鋼材の搬送ラインの片側に搬送方向と直角に設置された複数基の「水切りノズル群」から鋼材の表面に向けて流体を噴射して、鋼材の表面に残留する冷却水を排除することが記載されている。流体は、例えば空気である。また特許文献３では、同様の水切りノズルであるが、流体は水と空気とを混合したもの、としている。 For example, water leakage can be solved by providing a shut-off valve 45 in the vicinity of each nozzle 42. However, not only electrical and electronic equipment can be installed in areas where the periphery of the nozzle is hot and splashed, but electromagnetic Even with a valve of the type, it takes about 5 seconds for water to stop completely, and considering the size and price of the valve, it is not practical to install such a valve for each nozzle.
In Patent Document 1 and Patent Document 2, fluids are ejected from a plurality of “draining nozzle groups” installed on one side of a steel material conveying line at right angles to the conveying direction toward the surface of the steel material. It is described that residual cooling water is eliminated. The fluid is, for example, air. In Patent Document 3, a similar draining nozzle is used, but the fluid is a mixture of water and air.

しかしこれらの水切りノズルでは、一旦滞留した冷却水は排除できるが、ノズルからの水漏れが所定時間続く場合には対応できない。また、厚板の制御冷却のように板を停止させたり前後に揺動させたりする操業方法においては、水切りノズルでは局部的な過冷却に十分対処することはできない。
特許第３６１７４４８号公報 特許第３６７５３７２号公報 特開平９−１４１３２２号公報 However, these draining nozzles can remove the cooling water once retained, but cannot cope with the case where water leakage from the nozzle continues for a predetermined time. Further, in the operation method in which the plate is stopped or rocked back and forth like the controlled cooling of the thick plate, the draining nozzle cannot sufficiently cope with the local overcooling.
Japanese Patent No. 3617448 Japanese Patent No. 3675372 JP-A-9-141322

本発明は、従来の技術におけるこれらの問題点を解消し、現実的な手段で水漏れを完全に防止するようにした鋼材の冷却方法およびその装置を実現することを目的とする。   An object of the present invention is to realize a steel material cooling method and apparatus for solving these problems in the prior art and completely preventing water leakage by a practical means.

本発明の鋼材の冷却方法は、配管の先端に取り付けた複数基のノズルから冷却水を噴射して熱間圧延された鋼材を冷却するに際して、前記各ノズルの直近に水漏れ防止手段を設けて残留水を遮断することを特徴とし、望ましくは前記の鋼材の冷却が、冷却開始温度が７００〜１０００℃、冷却停止温度が６００〜９００℃の範囲である前記の鋼材の冷却方法である。   The steel material cooling method of the present invention is provided with water leakage prevention means in the immediate vicinity of each nozzle when cooling hot-rolled steel material by injecting cooling water from a plurality of nozzles attached to the tip of a pipe. Residual water is cut off, and preferably the cooling of the steel material is the cooling method of the steel material, wherein the cooling start temperature is in the range of 700 to 1000 ° C and the cooling stop temperature is in the range of 600 to 900 ° C.

また本発明の鋼材の冷却装置は、配管の先端に取り付けた複数基のノズルから熱間圧延された鋼材に冷却水を噴射する鋼材の冷却装置において、前記各ノズルの直近に残留水を遮断する水漏れ防止手段を設け、あるいはさらに前記の冷却装置の設置範囲で、鋼材の搬送方向側面から鋼材の幅方向に流体を噴射する水切りノズル群を設けたことを特徴とし、望ましくは前記の水漏れ防止手段が前記ノズルと一体に結合されているものであり、また前記の水漏れ防止手段が配管内の水圧により作動するものである前記の鋼材の冷却装置である。   Moreover, the steel material cooling device of the present invention is a steel material cooling device that injects cooling water from a plurality of nozzles attached to the tip of a pipe to hot-rolled steel material, and blocks residual water in the immediate vicinity of each nozzle. Water leakage prevention means is provided, or further, in the installation range of the cooling device, a water draining nozzle group for injecting fluid in the width direction of the steel material from the side surface in the steel material conveyance direction is provided. In the steel material cooling device, the prevention means is integrally coupled with the nozzle, and the water leakage prevention means is operated by water pressure in the pipe.

本発明によれば、ノズルの直近で水を遮断するので配管内に残留する水がほとんどなく、水漏れによる局部的な過冷却の発生が防止されて硬度むらがなくなり、鋼材の品質が向上することによりＴＭＣＰ圧延を安定して行うことができるという、すぐれた効果を奏する。   According to the present invention, water is shut off in the immediate vicinity of the nozzle, so that there is almost no water remaining in the piping, local overcooling due to water leakage is prevented, hardness unevenness is eliminated, and the quality of the steel material is improved. Thus, the excellent effect that TMCP rolling can be performed stably is achieved.

本発明の水漏れ防止装置の一例を図１により説明する。この図はノズルと、その上流側にねじ込み等により一体に結合した水漏れ防止装置とを示す断面図で、４２はノズル、４２１は噴出孔である。４３は筒状の水漏れ防止装置で、筒体の内部に弁座４３１、弁体４３２、釣り合いばね４３３、ばね支え（ばね座）４３４が上流側からこの順に組み込まれている。ばね支え４３４の位置、あるいは釣り合いばね４３３のばね力を調整することにより、図の上方から作用する水圧が所定値以下になると、弁体４３２が弁座に押しつけられて水流が遮断され、釣り合いばね４３３のばね力に打ち勝つ水圧が作用すれば弁体４３２は弁座４３１から離れ、水が流れる。したがって、たとえば冷却水の最大流量のときの水圧が０．４ＭＰａ、最小流量の時の水圧が０．０４ＭＰａであるとき、ばねの作動圧力（弁がふさがるときの水圧）を０．０２５ＭＰａに調整しておけば、最小流量の場合でも冷却水を流せば弁が開いて水を通し、停止すれば水圧が作用しなくなるので弁がふさがり、この先には滞留水はないので水漏れは発生しない。このように、水漏れ防止装置とノズル先端との距離を少なくし、この部分の容積を最小とすることが水漏れ防止に有効である。なお、弁座４３１の上流側に、ごみを除去するフィルタを設けてもよい。   An example of the water leakage preventing apparatus of the present invention will be described with reference to FIG. This figure is a cross-sectional view showing a nozzle and a water leakage prevention device integrally connected to the upstream side thereof by screwing or the like, wherein 42 is a nozzle, and 421 is an ejection hole. Reference numeral 43 denotes a cylindrical water leakage prevention device, in which a valve seat 431, a valve body 432, a balance spring 433, and a spring support (spring seat) 434 are incorporated in this order from the upstream side. By adjusting the position of the spring support 434 or the spring force of the balance spring 433, when the water pressure acting from the upper side of the figure becomes a predetermined value or less, the valve body 432 is pressed against the valve seat to interrupt the water flow, and the balance spring When water pressure that overcomes the spring force of 433 is applied, the valve body 432 moves away from the valve seat 431 and water flows. Therefore, for example, when the water pressure at the maximum flow rate of cooling water is 0.4 MPa and the water pressure at the minimum flow rate is 0.04 MPa, the operating pressure of the spring (water pressure when the valve is blocked) is adjusted to 0.025 MPa. In this case, even if the flow rate is the minimum flow rate, if the cooling water is flowed, the valve is opened to allow water to pass, and if it is stopped, the water pressure does not act, so the valve is blocked. Thus, it is effective for preventing water leakage by reducing the distance between the water leakage preventing device and the nozzle tip and minimizing the volume of this portion. A filter for removing dust may be provided on the upstream side of the valve seat 431.

図２は本発明の制御冷却装置を設置した圧延機間の搬送テーブルの平面図で、４６は搬送ローラ、４７は水切りノズルである。この上に、図示しない冷却水配管がある。
水切りノズル４７は従来の技術の項で説明したものと同様のもので、鋼材Ｐの搬送方向側面から鋼材Ｐの幅方向に空気等の流体を噴射する。前記の水漏れ防止装置によって冷却水停止後の水漏れは防止しても、すでに噴射されて鋼材Ｐの表面に残っている滞留水を完全に除去することはできないので、特に冷却停止後すぐには圧延を開始しない鋼材に対して、水切りノズル４７を併用すると一層効果的である。 FIG. 2 is a plan view of a conveyance table between rolling mills equipped with the control cooling device of the present invention, 46 is a conveyance roller, and 47 is a draining nozzle. Above this, there is a cooling water pipe (not shown).
The draining nozzle 47 is the same as that described in the section of the prior art, and jets a fluid such as air in the width direction of the steel material P from the side surface in the conveyance direction of the steel material P. Even if water leakage after stopping the cooling water is prevented by the above water leakage prevention device, the remaining water already injected and remaining on the surface of the steel material P cannot be completely removed. Is more effective when the draining nozzle 47 is used in combination with a steel material that does not start rolling.

（実施例１）
図３における第１の圧延機３で表面温度９２０℃で仕上げた板厚４５ｍｍの圧延材を、制御冷却装置４で８５０℃まで冷却した。制御冷却装置４の各ノズルには図１に示した水漏れ防止装置４３を取り付けてある。冷却停止後、冷却水の滴下は５秒程度で停まり、水漏れによる過冷却は発生しなかった。ついで第２の圧延機５により板厚２２ｍｍに仕上げた。製品の表面硬度差はＨＶで２０以内で、良好であった。 Example 1
The rolled material having a sheet thickness of 45 mm finished at the surface temperature of 920 ° C. by the first rolling mill 3 in FIG. 3 was cooled to 850 ° C. by the control cooling device 4. The water leakage prevention device 43 shown in FIG. 1 is attached to each nozzle of the control cooling device 4. After the cooling was stopped, dripping of the cooling water stopped in about 5 seconds, and no supercooling due to water leakage occurred. Then, the plate was finished to a thickness of 22 mm by the second rolling mill 5. Surface hardness difference product in 20 within at H V, was good.

（実施例２）
この実施例では、図２に示した水切りノズル４７を取り付け、冷却停止後に鋼材上の滞留水を除去するようにした。
第１の圧延機３で表面温度９２０℃で仕上げた板厚４５ｍｍの圧延材を、制御冷却装置４で８５０℃まで冷却した。冷却停止後の冷却水の滴下は５秒以内であり、水漏れによる過冷却は発生しなかった。しかし第２の圧延機５が前の材料を圧延中であったため、圧延待ちが３０秒発生し、この間に水切りノズル４７により滞留水を除去した。ついで第２の圧延機５により板厚２２ｍｍに仕上げた。製品の表面硬度差はＨＶで２０以内で、良好であった。 (Example 2)
In this embodiment, the draining nozzle 47 shown in FIG. 2 is attached, and the stagnant water on the steel material is removed after the cooling is stopped.
The rolled material having a sheet thickness of 45 mm finished at the surface temperature of 920 ° C. by the first rolling mill 3 was cooled to 850 ° C. by the control cooling device 4. The dripping of the cooling water after stopping the cooling was within 5 seconds, and no supercooling due to water leakage occurred. However, since the second rolling mill 5 was rolling the previous material, rolling waiting occurred for 30 seconds. During this time, stagnant water was removed by the draining nozzle 47. Then, the plate was finished to a thickness of 22 mm by the second rolling mill 5. Surface hardness difference product in 20 within at H V, was good.

（比較例１）
第１の実施例と同様、図３における第１の圧延機３で表面温度９２０℃で仕上げた板厚４５ｍｍの圧延材を、制御冷却装置４で８５０℃まで冷却した。ただし制御冷却装置４の各ノズルには水漏れ防止装置４３は取り付けなかった。冷却停止後、冷却水の滴下は約３０秒間続き、ついで第２の圧延機５により板厚２２ｍｍに仕上げたが、製品を検査したところ、過冷却部分にＨＶで８０以上の表面硬度差が見られ、この製品は不合格となった。 (Comparative Example 1)
As in the first example, the rolled material having a sheet thickness of 45 mm finished at the surface temperature of 920 ° C. by the first rolling mill 3 in FIG. 3 was cooled to 850 ° C. by the control cooling device 4. However, the water leakage prevention device 43 was not attached to each nozzle of the control cooling device 4. After cooling down, about 30 seconds continued dropping of the cooling water, then was finished to a thickness 22mm by a second rolling mill 5, were examined the product, surface hardness difference 80 or more H V supercooling part This product was rejected.

（比較例２）
この比較例では、実施例２と同様に図２に示した水切りノズル４７を取り付け、冷却停止後に鋼材上の滞留水を除去するようにした。ただし制御冷却装置４の各ノズルには水漏れ防止装置４３は取り付けなかった。
第１の圧延機３で表面温度９２０℃で仕上げた板厚４５ｍｍの圧延材を、制御冷却装置４で８５０℃まで冷却した。冷却停止後、水切りノズル４７によって滞留水は除去したが、第２の圧延機５の圧延待ちの間、冷却装置のノズルからは約３０秒間にわたって水漏れが続いたので、ノズル直下の圧延材は局部的に約１２０℃以上過冷却された。第２の圧延機５により板厚２２ｍｍに仕上げた後、製品を検査したところ、過冷却部分にＨＶで１１０以上の表面硬度差が見られ、この製品は不合格となった。 (Comparative Example 2)
In this comparative example, the draining nozzle 47 shown in FIG. 2 was attached in the same manner as in Example 2, and the retained water on the steel material was removed after cooling was stopped. However, the water leakage prevention device 43 was not attached to each nozzle of the control cooling device 4.
The rolled material having a sheet thickness of 45 mm finished at the surface temperature of 920 ° C. by the first rolling mill 3 was cooled to 850 ° C. by the control cooling device 4. After the cooling was stopped, the accumulated water was removed by the draining nozzle 47, but water leakage continued from the nozzle of the cooling device for about 30 seconds while waiting for rolling of the second rolling mill 5, so that the rolled material directly under the nozzle was It was supercooled locally at about 120 ° C or higher. After finishing the sheet thickness 22mm by a second rolling mill 5, were examined the product, the surface hardness differences over 110 in H V supercooling part is seen, the product had failed.

本発明実施例におけるノズルと、その上流側にねじ込みにより直結した水漏れ防止装置とを示す断面図である。It is sectional drawing which shows the nozzle in this invention Example, and the water leak prevention apparatus directly connected by screwing in the upstream. 実施例の制御冷却装置を設置した圧延機間の搬送テーブルの平面図である。It is a top view of the conveyance table between the rolling mills which installed the control cooling apparatus of the Example. 本発明に係わる厚板製造設備の一例を示す側面レイアウト図である。It is a side layout figure showing an example of the board manufacturing equipment concerning the present invention. 本発明に係わる制御冷却装置の配管の一例を示す平面図である。It is a top view which shows an example of piping of the control cooling apparatus concerning this invention. 従来例における鋼材の幅方向の温度分布の一例を示すグラフである。It is a graph which shows an example of the temperature distribution of the width direction of the steel materials in a prior art example.

符号の説明Explanation of symbols

１ 加熱炉
２ スケールブレーカ
３ 第１の圧延機
４ 制御冷却装置
５ 第２の圧延機
６ 強制冷却装置
７ 矯正機（レベラ）
４１ ヘッダ
４２ ノズル
４３ 水漏れ防止装置
４４ 配管
４５ 遮断弁
４６ 搬送ローラ
４７ 水切りノズル
４２１ 噴出孔
４３１ 弁座
４３２ 弁体
４３３ 釣り合いばね
４３４ ばね支え（ばね座）
Ｐ 鋼材（厚板） DESCRIPTION OF SYMBOLS 1 Heating furnace 2 Scale breaker 3 1st rolling mill 4 Control cooling device 5 2nd rolling mill 6 Forced cooling device 7 Straightening machine (leveler)
41 Header 42 Nozzle 43 Water Leakage Prevention Device 44 Piping 45 Shutoff Valve 46 Conveying Roller 47 Draining Nozzle 421 Blowing Hole 431 Valve Seat 432 Valve Element 433 Balance Spring 434 Spring Support (Spring Seat)
P Steel (thick plate)

Claims (6)

配管の先端に取り付けた複数基のノズルから冷却水を噴射して熱間圧延された鋼材を冷却するに際して、前記各ノズルの直近に水漏れ防止手段を設けて残留水を遮断することを特徴とする鋼材の冷却方法。   When cooling the hot-rolled steel material by injecting cooling water from a plurality of nozzles attached to the tip of the pipe, water leakage prevention means is provided in the immediate vicinity of each nozzle to block residual water. To cool the steel. 前記の鋼材の冷却が、冷却開始温度が７００〜１０００℃、冷却停止温度が６００〜９００℃の範囲である請求項１に記載の鋼材の冷却方法。   The method for cooling a steel material according to claim 1, wherein the steel material is cooled in a range of a cooling start temperature of 700 to 1000 ° C and a cooling stop temperature of 600 to 900 ° C. 配管の先端に取り付けた複数基のノズルから熱間圧延された鋼材に冷却水を噴射する鋼材の冷却装置において、前記各ノズルの直近に残留水を遮断する水漏れ防止手段を設けたことを特徴とする鋼材の冷却装置。   In a steel material cooling apparatus for injecting cooling water to steel that has been hot-rolled from a plurality of nozzles attached to the tip of a pipe, water leakage prevention means for blocking residual water is provided in the immediate vicinity of each nozzle. A steel cooling device. 配管の先端に取り付けた複数基のノズルから熱間圧延された鋼材に冷却水を噴射する鋼材の冷却装置において、前記各ノズルの直近に残留水を遮断する水漏れ防止手段を設けるとともに、前記の冷却装置の設置範囲で、鋼材の搬送方向側面から鋼材の幅方向に流体を噴射する水切りノズル群を設けたことを特徴とする鋼材の冷却装置。   In the steel material cooling apparatus for injecting the cooling water to the hot-rolled steel material from a plurality of nozzles attached to the tip of the pipe, a water leakage preventing means for blocking residual water is provided in the immediate vicinity of each nozzle, and A steel material cooling apparatus comprising a draining nozzle group for injecting a fluid in a width direction of the steel material from a side surface in the conveying direction of the steel material in an installation range of the cooling device. 前記の水漏れ防止手段が前記ノズルと一体に結合されている請求項３または４に記載の鋼材の冷却装置。   The steel material cooling device according to claim 3 or 4, wherein the water leakage preventing means is integrally coupled to the nozzle. 前記の水漏れ防止手段が配管内の水圧により作動するものである請求項３ないし５のいずれかに記載の鋼材の冷却装置。   The steel material cooling device according to any one of claims 3 to 5, wherein the water leakage preventing means is operated by water pressure in the pipe.
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JP2014036993A (en) * 2012-08-20 2014-02-27 Jfe Steel Corp Method and apparatus for estimating shape defect due to run-out cooling strain

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