JP7342898B2 - Method and apparatus for producing hot rolled steel strip - Google Patents

Method and apparatus for producing hot rolled steel strip Download PDF

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JP7342898B2
JP7342898B2 JP2021015343A JP2021015343A JP7342898B2 JP 7342898 B2 JP7342898 B2 JP 7342898B2 JP 2021015343 A JP2021015343 A JP 2021015343A JP 2021015343 A JP2021015343 A JP 2021015343A JP 7342898 B2 JP7342898 B2 JP 7342898B2
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寛人 後藤
広和 杉原
豪巨 深江
真行 加藤
雄介 瀧下
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JFE Steel Corp
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Description

本発明は、熱延鋼帯の製造方法及び製造装置、特に、仕上圧延後の長さがランナウトテーブルの長さよりも短くなる鋼材の巻取温度の目標巻取温度の達成と当該鋼材の巻取機での適切な巻付きの両立を可能とした熱延鋼帯の製造方法及び製造装置に関する。 The present invention relates to a method and apparatus for producing a hot rolled steel strip, and in particular, to achieving a target coiling temperature of a steel material whose length after finish rolling is shorter than the length of a runout table, and to coiling the steel material. The present invention relates to a method and apparatus for manufacturing a hot rolled steel strip that enables both proper winding in a machine.

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の板厚に粗圧延してシートバーとし、その後、複数基のスタンドからなる仕上圧延機で所定の板厚に仕上圧延する。仕上圧延されたシートバーは、所定の板厚の熱延鋼帯となり、仕上圧延機の下流側に設置されたランナウトテーブル（冷却設備）で冷却される。その後、熱延鋼帯は、巻取機によりコイル状に巻き取られて製造される。熱延鋼帯を製造する加熱炉、粗圧延機、仕上圧延機、ランナウトテーブル、及び巻取機の一連の設備を熱間圧延ラインという。
ここで、ランナウトテーブルは、通過する熱延鋼帯に対して、上下に設置された多数のノズルから水を噴出することで熱延鋼帯を冷却する設備である。 Generally, hot-rolled steel strip is produced by heating a slab to a predetermined temperature in a heating furnace, then rough rolling the heated slab to a predetermined thickness in a rough rolling mill to form a sheet bar, and then finishing it using multiple stands. The plate is finished rolled to a predetermined thickness using a rolling mill. The finish-rolled sheet bar becomes a hot-rolled steel strip with a predetermined thickness, and is cooled on a runout table (cooling equipment) installed downstream of the finish rolling mill. Thereafter, the hot rolled steel strip is manufactured by winding it into a coil shape using a winding machine. A series of equipment for manufacturing hot rolled steel strips, including a heating furnace, rough rolling mill, finishing rolling mill, runout table, and winding machine, is called a hot rolling line.
Here, the runout table is equipment that cools the hot-rolled steel strip by spouting water from a number of nozzles installed above and below the hot-rolled steel strip as it passes.

熱延鋼帯は、用途により製造条件が異なる。特に、ＣＴと呼ばれる巻き取り時の温度は、熱延鋼帯の特性に大きく影響を与えるため、製造条件を決める指標として重要となる。ランナウトテーブルでの冷却により、仕上圧延後の熱延鋼帯のＣＴ（巻取温度）を、目標ＣＴ（目標巻取温度）まで冷却水をかけることで冷却する。
ランナウトテーブルでは冷却水を噴射する区間を分けられるようになっている。各区間をバンクと呼ぶ。冷却水を噴射するバンク数を増減させることで、熱延鋼帯に冷却水がかかる時間を調整しＣＴを制御する。使用するバンク数が多いほど、通過に要する時間が長くなり、冷却による温度降下量が大きくなる。 The manufacturing conditions for hot-rolled steel strip vary depending on its use. In particular, the temperature at the time of winding, called CT, has a large effect on the properties of the hot rolled steel strip and is therefore important as an index for determining manufacturing conditions. By cooling on the runout table, the CT (coiling temperature) of the hot rolled steel strip after finish rolling is cooled down to the target CT (target coiling temperature) by applying cooling water.
The runout table allows you to separate the sections where cooling water is injected. Each section is called a bank. By increasing or decreasing the number of banks that inject cooling water, the time during which cooling water is applied to the hot rolled steel strip is adjusted and CT is controlled. The greater the number of banks used, the longer the passage time and the greater the temperature drop due to cooling.

ランナウトテーブルで熱延鋼帯を冷却するときの温度降下量は、ランナウトテーブルの長さの制約を受ける。すべてのバンクで冷却水を噴射しているときが、温度降下量が最大となるときである。
また、熱延鋼帯をランナウトテーブルで冷却する時間は、熱延鋼帯の搬送速度の影響も受ける。熱延鋼帯の搬送速度が遅いほど冷却時間が長くなるため、ＣＴを低くすることができる。
さらに、冷却能力は熱延鋼帯の板厚の影響も受ける。板が厚いほど冷えにくく、板が薄いほど冷えやすい。 The amount of temperature drop when a hot rolled steel strip is cooled by a runout table is limited by the length of the runout table. The temperature drop is at its maximum when all banks are injecting cooling water.
Further, the time for cooling the hot-rolled steel strip on the runout table is also affected by the conveyance speed of the hot-rolled steel strip. The slower the conveyance speed of the hot-rolled steel strip is, the longer the cooling time becomes, so the CT can be lowered.
Furthermore, the cooling capacity is also affected by the thickness of the hot rolled steel strip. The thicker the board, the harder it is to get cold, and the thinner the board, the easier it is to get cold.

熱間圧延ラインでは、一般的には１９ｍｍから３０ｍｍ程度の板厚を有する厚物とよばれる熱延鋼帯を製造することがある。厚物は、板厚が大きいため目標ＣＴを達成しにくい。そして、厚物の熱延鋼帯を製造するに際しては、仕上圧延後の板厚が一般的に１９ｍｍ以上となり、熱延鋼帯によっては仕上圧延後の長さがランナウトテーブルの長さよりも短くなることがある。
ランナウトテーブルを通過した熱延鋼帯は、次に巻取機で巻き取られてコイル状になる。巻取時には、まず熱延鋼帯の先端部がピンチロールによって曲げられる。その後、マンドレルによって巻取られる。 Hot rolling lines generally produce hot rolled steel strips called thick steel strips having a thickness of about 19 mm to 30 mm. For thick materials, it is difficult to achieve the target CT because the plate thickness is large. When manufacturing thick hot rolled steel strips, the thickness after finish rolling is generally 19 mm or more, and depending on the hot rolled steel strip, the length after finish rolling may be shorter than the length of the runout table. Sometimes.
The hot rolled steel strip that has passed through the runout table is then wound up into a coil by a winder. During winding, the tip of the hot rolled steel strip is first bent by pinch rolls. It is then wound up by a mandrel.

熱延鋼帯は、巻取機で巻取りを開始するときに、巻取機への進入速度が遅い場合には、うまく巻取れない。巻取りの開始時には、先端部を塑性変形させて、マンドレルと呼ばれる巻取機の中心軸に巻き付かせる。材料の持つ運動エネルギーを利用して先端部の塑性変形させているため、巻取時の最初の速度が重要となる。速度が大きいほど運動エネルギーが大きくなるため、巻付性が上がる。
巻取り開始時の適正な速度は、熱延鋼帯の幅や厚みで異なり、厚物に対しては１５０ｍｐｍ以上の速度で巻取機に侵入させて巻取りを開始する。 When starting winding with a winder, a hot-rolled steel strip cannot be wound well if the speed of entry into the winder is slow. At the start of winding, the tip is plastically deformed and wound around the central shaft of the winder, called a mandrel. Since the kinetic energy of the material is used to plastically deform the tip, the initial winding speed is important. The higher the speed, the greater the kinetic energy, which improves the windability.
The appropriate speed at the start of winding varies depending on the width and thickness of the hot-rolled steel strip, and for thick products, the winding is started by entering the winder at a speed of 150 mpm or more.

しかし、巻付性を優先し、ランナウトテーブルにおいて熱延鋼帯の搬送速度を上げた場合、ランナウトテーブルを通過する時間が短くなるので、目標ＣＴ（目標巻取温度）の達成が難しくなる。一方で、目標ＣＴを達成するために搬送速度を遅くするすると、巻付性が問題となることがある。とくに、厚物においては、巻付に必要な運動エネルギーが大きい上に、冷却しにくいため、目標ＣＴの達成と適切な巻付きの両立が困難となる。
そのため、熱延鋼帯の製造するために、目標ＣＴを達成しつつ、適切な巻付きを実現するために、様々な開発がなされてきた。 However, when the winding property is prioritized and the conveyance speed of the hot rolled steel strip is increased at the runout table, the time for passing through the runout table becomes shorter, making it difficult to achieve the target CT (target coiling temperature). On the other hand, if the conveyance speed is slowed down to achieve the target CT, the windability may become a problem. In particular, thick materials require a large amount of kinetic energy for wrapping and are difficult to cool, making it difficult to achieve both the target CT and appropriate wrapping.
Therefore, various developments have been made to achieve appropriate winding while achieving the target CT in order to manufacture hot rolled steel strips.

従来のこの種の熱延鋼帯の冷却装置として、例えば、特許文献１に示すものが知られている。
特許文献１に示す熱延鋼帯の冷却装置は、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（冷却設備）で鋼帯の上下面に冷却水を噴射するノズルを設置し、鋼帯を冷却する冷却装置を最終仕上圧延機の後方直近に配置している。そして、圧延機から冷却装置まではガイドで挟まれた狭い隙間に鋼帯を搬送させるようにしている。
特許文献１に示す熱延鋼帯の冷却装置によれば、圧延直後の鋼帯を圧延機直近で上下に対称に急速冷却が可能となり、オンラインの冷却によって結晶粒の微細な熱延鋼帯を安定して製造することができる。 As a conventional cooling device for hot-rolled steel strips of this kind, for example, one shown in Patent Document 1 is known.
The hot-rolled steel strip cooling device shown in Patent Document 1 is a runout (cooling equipment) in which the steel strip is conveyed on a plurality of rotating roller tables, and nozzles are installed to spray cooling water on the upper and lower surfaces of the steel strip. A cooling device that cools the steel strip is placed immediately behind the final rolling mill. The steel strip is conveyed through a narrow gap between guides from the rolling mill to the cooling device.
According to the hot-rolled steel strip cooling device disclosed in Patent Document 1, it is possible to quickly cool the steel strip immediately after rolling symmetrically vertically in the vicinity of the rolling mill, and the hot-rolled steel strip with fine grains can be cooled by online cooling. Can be manufactured stably.

また、従来の熱延鋼帯の冷却装置として、例えば、特許文献２に示すものも知られている。
特許文献２に示す熱延鋼帯の冷却装置は、鋼帯が搬送されるランナウト上で、搬送ロール間に下面冷却ボックスを設置し、この下面冷却ボックスと相対する位置にライン上から昇降可能な上面冷却ボックスを設置している。そして、鋼帯に対し上下対称に冷却水を噴射し、これら上下部からくる冷却水流が合流するほぼ中心部に鋼帯を通過させ、少なくとも出側には搬送ロールと周速度が同一の水切りロールを昇降自在に設置し、鋼帯先端が冷却装置を通過するのと同時に水切りロールを回転させながら下降させ、同時に上面冷却ボックスも下降させて鋼帯の冷却を行う。
この特許文献２に示す熱延鋼帯の冷却装置によれば、上下対称に急速な冷却が可能となり、オンラインの冷却によって結晶粒の微細な熱延鋼帯を安定して製造することができる。 Furthermore, as a conventional hot-rolled steel strip cooling device, for example, one shown in Patent Document 2 is also known.
The hot-rolled steel strip cooling device disclosed in Patent Document 2 includes a lower cooling box installed between conveyor rolls on a runout where the steel strip is conveyed, and a lower cooling box that can be raised and lowered from the line to a position facing the lower cooling box. A top cooling box is installed. Cooling water is then injected vertically symmetrically to the steel strip, and the steel strip is passed through approximately the center where the cooling water flows coming from the upper and lower parts join, and at least on the exit side, a draining roll whose circumferential speed is the same as that of the conveyor roll is used. is installed so that it can be raised and lowered freely, and at the same time as the tip of the steel strip passes through the cooling device, it is lowered while rotating the drain roll, and at the same time, the upper cooling box is also lowered to cool the steel strip.
According to the hot-rolled steel strip cooling device disclosed in Patent Document 2, rapid cooling can be performed vertically symmetrically, and a hot-rolled steel strip with fine crystal grains can be stably produced by online cooling.

特開２００１－２４６４１０号公報Japanese Patent Application Publication No. 2001-246410 特開２００２－３１６２０５号公報Japanese Patent Application Publication No. 2002-316205

ところで、前述したように、熱間圧延ラインでは、一般的に１９ｍｍから３０ｍｍ程度の板厚を有する厚物とよばれる熱延鋼帯を製造することがある。そして、厚物の熱延鋼帯を製造するに際しては、仕上圧延後の板厚が一般的に１９ｍｍ以上となり、熱延鋼帯によっては仕上圧延後の長さがランナウトテーブルの長さよりも短くなることがある。
しかしながら、特許文献１に示す熱延鋼帯の冷却装置及び特許文献２に示す熱延鋼帯の冷却装置のいずれにあっても、仕上圧延後の長さがランナウトテーブルの長さよりも短くなる熱延鋼帯の冷却及び製造については、一切言及していない。
このため、特許文献１及び特許文献２に示す熱延鋼帯の冷却装置では、仕上圧延後の長さがランナウトテーブルの長さよりも短くなる鋼材のＣＴの目標ＣＴの達成と当該鋼材の巻取機での適切な巻付きの両立を図ることができない場合がある。 By the way, as described above, in hot rolling lines, hot-rolled steel strips, which are generally called thick strips and have a thickness of about 19 mm to 30 mm, are sometimes manufactured. When manufacturing thick hot rolled steel strips, the thickness after finish rolling is generally 19 mm or more, and depending on the hot rolled steel strip, the length after finish rolling may be shorter than the length of the runout table. Sometimes.
However, in both the hot-rolled steel strip cooling device shown in Patent Document 1 and the hot-rolled steel strip cooling device shown in Patent Document 2, the length after finish rolling becomes shorter than the length of the runout table. There is no mention of cooling and manufacturing of the rolled steel strip.
For this reason, in the hot-rolled steel strip cooling apparatus shown in Patent Document 1 and Patent Document 2, it is necessary to achieve the target CT of the steel material whose length after finish rolling is shorter than the length of the runout table, and to wind the steel material. In some cases, it may not be possible to achieve both appropriate winding on the machine.

つまり、当該鋼材の仕上圧延速度は一般的に最低速度が８０ｍｐｍ、最高速度が４００ｍｐｍ程度であるが、その仕上圧延速度でランナウトテーブルにおいてその鋼材が通過すると、当該鋼材のランナウトテーブルを通過する時間が短くなる。その際に、厚物の場合には、冷却時間が短いことから、鋼材のＣＴが目標ＣＴに達成しない場合がある。鋼材の冷却制御において冷却水の噴射量を増加（すべてのバンクから冷却水を噴射し、各バンクでの冷却水量を増加）すれば目標ＣＴを確保できることがあるが、冷却設備の関係で冷却水の噴射量を増加することにも限界があり、目標の冷却水噴射量を得られないことがあるからである。 In other words, the finish rolling speed of the steel material is generally about 80 mpm at the lowest speed and about 400 mpm at the maximum speed, but when the steel material passes through the runout table at that finish rolling speed, the time it takes for the steel material to pass through the runout table is Becomes shorter. At this time, in the case of thick steel materials, the CT of the steel material may not reach the target CT because the cooling time is short. In cooling control of steel materials, it is possible to secure the target CT by increasing the injection amount of cooling water (injecting cooling water from all banks and increasing the amount of cooling water in each bank), but due to the cooling equipment, the cooling water This is because there is a limit to increasing the injection amount of cooling water, and it may not be possible to obtain the target cooling water injection amount.

一方、当該鋼材の搬送速度を仕上圧延速度よりも遅くしてその搬送速度でランナウトテーブルにおいてその鋼材が通過すると、前述したように、目標ＣＴを達成することは可能となるが、巻取機での巻付性が問題となる。
従って、本発明はこの従来の課題を解決するためになされたものであり、その目的は、仕上圧延後の長さがランナウトテーブルの長さよりも短くなる鋼材の巻取温度の目標巻取温度の達成と当該鋼材の巻取機での適切な巻付きの両立を可能とした熱延鋼帯の製造方法及び製造装置を提供することにある。 On the other hand, if the conveyance speed of the steel material is slower than the finish rolling speed and the steel material passes through the runout table at that conveyance speed, it is possible to achieve the target CT as described above, but the winding machine Wrapping properties are a problem.
Therefore, the present invention has been made to solve this conventional problem, and its purpose is to set a target coiling temperature for a steel material whose length after finish rolling is shorter than the length of the runout table. It is an object of the present invention to provide a method and apparatus for manufacturing a hot rolled steel strip that can achieve both the above-mentioned results and appropriate winding of the steel material on a winder.

上記目的を達成するために、本発明の一態様に係る熱延鋼帯の製造方法は、鋼材を仕上圧延機で仕上圧延する仕上圧延工程と、該仕上圧延工程で仕上圧延された鋼材を、前記仕上圧延機の下流側に設けられたランナウトテーブルで冷却する冷却工程と、該冷却工程で冷却された鋼材を巻取機で巻取る巻取工程とを含み、下記（１）式で定義される仕上圧延された後の前記鋼材の長さＬｓが前記ランナウトテーブルの長さＬｅよりも短くなる熱延鋼帯の製造方法であって、前記ランナウトテーブルに前記鋼材の先端部が仕上圧延速度で進入を開始した後に、前記鋼材の搬送速度を８０ｍｐｍ未満の減速時速度にまで減速させて、当該減速時速度で前記鋼材を搬送し、その後に、前記鋼材の先端部が前記巻取機に巻取り開始されるまでの間に、前記鋼材の搬送速度を１５０ｍｐｍから４００ｍｐｍまでの間の巻取時速度にまで加速させるよう制御することを要旨とする。
Ｌｓ＝Ｍ／（ρＴＷ） ・・・（１）
ここで、Ｍは鋼材の重量、ρは鋼材の密度、Ｔは仕上圧延後の鋼材の板厚、Ｗは仕上圧延後の鋼材の板幅である。なお、ρは例えば７．８５ｔｏｎ／ｍ３の値が用いられる。 In order to achieve the above object, a method for manufacturing a hot-rolled steel strip according to one aspect of the present invention includes a finish rolling process in which a steel material is finish rolled in a finish rolling mill, and a steel product finished rolled in the finish rolling process. It includes a cooling process in which the steel material is cooled on a runout table provided on the downstream side of the finishing rolling mill, and a winding process in which the steel material cooled in the cooling process is wound in a winding machine, and is defined by the following formula (1). A method for producing a hot-rolled steel strip in which the length Ls of the steel material after finish rolling is shorter than the length Le of the runout table, wherein the tip of the steel material is placed on the runout table at a finish rolling speed. After starting the approach, the conveyance speed of the steel material is reduced to a deceleration speed of less than 80 mpm, and the steel material is conveyed at the deceleration speed, and then the tip of the steel material is wound on the winder. The gist is to control the conveyance speed of the steel material to be accelerated to a winding speed between 150 mpm and 400 mpm until the winding is started.
Ls=M/(ρTW)...(1)
Here, M is the weight of the steel material, ρ is the density of the steel material, T is the plate thickness of the steel material after finish rolling, and W is the plate width of the steel material after finish rolling. Note that, for example, a value of 7.85 ton/m 3 is used for ρ.

また、本発明の別の態様に係る熱延鋼帯の製造装置は、鋼材を仕上圧延する仕上圧延機と、該仕上圧延機の下流側に設けられ、前記仕上圧延機で仕上圧延された鋼材を冷却するランナウトテーブルと、該ランナウトテーブルで冷却された鋼材を巻取る巻取機とを備え、前述の（１）式で定義される仕上圧延された後の前記鋼材の長さＬｓが前記ランナウトテーブルの長さＬｅよりも短くなる熱延鋼帯の製造装置であって、前記ランナウトテーブルに前記鋼材の先端部が仕上圧延速度で進入を開始した後に、前記鋼材の搬送速度を８０ｍｐｍ未満の減速時速度にまで減速させて、当該減速時速度で前記鋼材を搬送し、その後に、前記鋼材の先端部が前記巻取機に巻取り開始されるまでの間に、前記鋼材の搬送速度を１５０ｍｐｍから４００ｍｐｍまでの間の巻取時速度にまで加速させるよう制御する冷却制御部を備えていることを要旨とする。
例えば、鋼材の重量Ｍが３２ｔｏｎの場合、仕上圧延後の鋼材の板幅Ｗが２０００ｍｍでは、仕上圧延後の鋼材の板厚Ｔが１９ｍｍ以上のときに、仕上圧延された後の鋼材の長さＬｓが１０７．４ｍ以下になるため、ランナウトテーブルの長さＬｅが１４０ｍの場合は、本発明による制御が可能となる。 Further, a hot rolled steel strip manufacturing apparatus according to another aspect of the present invention includes a finishing rolling mill for finish rolling a steel material, and a steel material provided on the downstream side of the finishing rolling mill, and a steel material finish rolled by the finishing rolling mill. and a winder that winds up the steel material cooled by the runout table, and the length Ls of the steel material after finish rolling defined by the above-mentioned formula (1) is the length of the runout table. An apparatus for producing a hot-rolled steel strip whose length is shorter than a table length Le, wherein after the tip of the steel material starts to enter the runout table at a finish rolling speed, the conveyance speed of the steel material is reduced to less than 80 mpm. The steel material is conveyed at the decelerated speed, and then the conveyance speed of the steel material is reduced to 150 mpm until the tip of the steel material starts being wound up by the winding machine. The gist of the present invention is to include a cooling control unit that controls the winding speed to be accelerated to a winding speed of 400 mpm to 400 mpm.
For example, when the weight M of the steel material is 32 tons, when the plate width W of the steel material after finish rolling is 2000 mm, and when the plate thickness T of the steel material after finish rolling is 19 mm or more, the length of the steel material after finish rolling is Since Ls is 107.4 m or less, control according to the present invention is possible when the length Le of the runout table is 140 m.

本発明に係る熱延鋼帯の製造方法及び製造装置によれば、仕上圧延後の長さがランナウトテーブルの長さよりも短くなる鋼材の巻取温度の目標巻取温度の達成と当該鋼材の巻取機での適切な巻付きの両立を可能とした熱延鋼帯の製造方法及び製造装置を提供できる。 According to the hot rolled steel strip manufacturing method and manufacturing apparatus according to the present invention, it is possible to achieve a target winding temperature of a steel material whose length after finish rolling is shorter than the length of a runout table, and to roll the steel material. It is possible to provide a method and apparatus for manufacturing a hot-rolled steel strip that can achieve both appropriate winding in a rolling machine.

本発明の一実施形態に係る熱延鋼帯の製造装置である熱間圧延ラインの概略構成図である。1 is a schematic configuration diagram of a hot rolling line that is a hot rolled steel strip manufacturing apparatus according to an embodiment of the present invention. 図１に示す熱間圧延ラインにおいて、仕上圧延された後の鋼材の長さがランナウトテーブルの長さよりも短いときの、鋼材と仕上圧延機の最終スタンド、ランナウトテーブル、及び巻取機の配置を示す模式図である。In the hot rolling line shown in Figure 1, the arrangement of the steel material, the final stand of the finishing mill, the runout table, and the winder when the length of the steel material after finish rolling is shorter than the length of the runout table. FIG. 図１に示す熱間圧延ラインにおいて、仕上圧延された後の鋼材の長さがランナウトテーブルの長さ以上のときの、鋼材と仕上圧延機の最終スタンド、ランナウトテーブル、及び巻取機の配置を示す模式図である。In the hot rolling line shown in Figure 1, the arrangement of the steel material, the final stand of the finish rolling mill, the runout table, and the winder when the length of the steel material after finish rolling is longer than the length of the runout table. FIG. 仕上圧延された後の長さがランナウトテーブルの長さよりも短くなる鋼材を仕上圧延速度から減速させ、その後、加速させたときの、鋼材の先端部及び尾端部の搬送速度と仕上圧延機最終スタンド出側からのランナウトテーブル上の位置との関係を示すグラフである。When a steel material whose length after finish rolling is shorter than the length of the runout table is decelerated from the finish rolling speed and then accelerated, the conveyance speed of the tip and tail ends of the steel material and the final rolling mill finish. It is a graph showing the relationship with the position on the runout table from the exit side of the stand. 仕上圧延された後の長さがランナウトテーブルの長さよりも長くなる鋼材の先端部及び尾端部の搬送速度と仕上圧延機最終スタンド出側からのランナウトテーブル上の位置との関係を示すグラフである。This is a graph showing the relationship between the conveyance speed of the tip and tail ends of a steel material whose length after finish rolling is longer than the length of the runout table and the position on the runout table from the exit side of the final stand of the finish rolling mill. be. 仕上圧延された後の長さがランナウトテーブルの長さよりも短くなる鋼材を仕上圧延速度から減速させずに定速で搬送させた後、加速させたときの、鋼材の先端部及び尾端部の搬送速度と仕上圧延機最終スタンド出側からのランナウトテーブル上の位置との関係を示すグラフである。The tip and tail ends of a steel material whose length after finish rolling is shorter than the length of the runout table are conveyed at a constant speed without decelerating from the finish rolling speed and then accelerated. It is a graph showing the relationship between the conveyance speed and the position on the runout table from the exit side of the final stand of the finishing mill.

以下、本発明の実施の形態を図面を参照して説明する。以下に示す実施形態は、本発明の技術的思想を具体化するための装置や方法を例示するものであって、本発明の技術的思想は、構成部品の材質、形状、構造、配置等を下記の実施形態に特定するものではない。
また、図面は模式的なものである。そのため、厚みと平面寸法との関係、比率等は現実のものとは異なることに留意すべきであり、図面相互間においても互いの寸法の関係や比率が異なる部分が含まれている。 Embodiments of the present invention will be described below with reference to the drawings. The embodiments shown below illustrate devices and methods for embodying the technical idea of the present invention. It is not limited to the embodiments described below.
Furthermore, the drawings are schematic. Therefore, it should be noted that the relationships, ratios, etc. between thickness and planar dimensions are different from those in reality, and the drawings also include portions where the relationships and ratios of dimensions are different.

図１には、本発明の一実施形態に係る熱延鋼帯の製造装置である熱間圧延ラインの概略構成が示されている。
図１に示す熱間圧延ライン１は、鋼材Ｓの搬送方向上流側から下流に向かう順に、鋼材Ｓを加熱する加熱炉２と、加熱された鋼材Ｓを粗圧延する複数のスタンドＲ１～Ｒ３を有する粗圧延機３と、粗圧延された鋼材Ｓを仕上圧延する複数のスタンドＦ１～Ｆ７を有する仕上圧延機４と、仕上圧延された鋼材Ｓを所定温度まで冷却するランナウトテーブル５と、冷却された鋼材Ｓをコイルに巻き取る巻取機８とを備えている。仕上圧延された鋼材Ｓは、所定板厚の熱延鋼帯となり、所定の巻取温度（ＣＴ）でコイルに巻き取られて製造される。 FIG. 1 shows a schematic configuration of a hot rolling line that is a hot rolled steel strip manufacturing apparatus according to an embodiment of the present invention.
The hot rolling line 1 shown in FIG. 1 includes a heating furnace 2 for heating the steel material S and a plurality of stands R1 to R3 for rough rolling the heated steel material S, in order from the upstream side to the downstream side in the conveyance direction of the steel material S. a finishing mill 4 having a plurality of stands F1 to F7 for finish rolling the rough rolled steel material S; a runout table 5 for cooling the finish rolled steel material S to a predetermined temperature; The coiler 8 is provided with a winder 8 for winding the steel material S into a coil. The finish-rolled steel material S becomes a hot-rolled steel strip with a predetermined thickness, and is manufactured by being wound into a coil at a predetermined coiling temperature (CT).

つまり、熱延鋼帯は、鋼材Ｓを加熱炉２で加熱する加熱工程と、加熱された鋼材Ｓを粗圧延機３で粗圧延する粗圧延工程と、粗あつえされた鋼材Ｓを仕上圧延機４で仕上圧延する仕上圧延工程と、仕上圧延工程で仕上圧延された鋼材Ｓを、仕上圧延機４の下流側に設けられたランナウトテーブル５で冷却する冷却工程と、冷却工程で冷却された鋼材Ｓを巻取機８で巻取る巻取工程とを経て製造される。
ここで、仕上圧延機４の所定スタンドのワークロールの回転軸には、その回転数を計測し鋼材Ｓの搬送速度である板速度を測定する出側板速度検出器９が設けられている。
また、仕上圧延機４の出側には、仕上圧延出側の鋼材Ｓの温度である板温度（実績ＦＤＴ）を測定する出側板温度計１０が設置されている。また、仕上圧延機４の出側には、仕上圧延後の鋼材Ｓの板厚を測定する出側板厚計１１が設置されている。更に、仕上圧延機４の出側には、仕上圧延後の鋼材Ｓの板幅を測定する出側板幅計１２が設置されている。 In other words, hot rolled steel strip is produced through a heating process in which the steel material S is heated in a heating furnace 2, a rough rolling process in which the heated steel material S is roughly rolled in a rough rolling mill 3, and a rough rolled steel material S is finished rolled. A finishing rolling process in which the steel material S finish-rolled in the finishing rolling process is cooled in a runout table 5 provided on the downstream side of the finishing rolling machine 4; It is manufactured through a winding process of winding the steel material S with a winding machine 8.
Here, the rotating shaft of the work roll of a predetermined stand of the finishing rolling mill 4 is provided with an exit plate speed detector 9 that measures the number of revolutions thereof and measures the plate speed, which is the transport speed of the steel material S.
Further, on the exit side of the finishing rolling mill 4, an exit plate thermometer 10 is installed to measure the plate temperature (actual FDT), which is the temperature of the steel material S on the finishing rolling exit side. Further, on the exit side of the finish rolling mill 4, an exit side plate thickness gage 11 is installed to measure the thickness of the steel material S after finish rolling. Further, on the exit side of the finish rolling mill 4, an exit side plate width gauge 12 is installed to measure the width of the steel material S after finish rolling.

また、ランナウトテーブル５は、図示はしないが、鋼材Ｓの搬送方向に沿って配設された複数のバンクを備え、各バンクには、通過する鋼材Ｓに対し冷却水を噴射する複数のノズルが設置されている。後述するように、冷却水を噴射するノズルのあるバンクの数及び鋼材Ｓの搬送速度を後述する冷却制御部１４が制御することで鋼材Ｓに冷却水がかかる時間及び冷却水量を調整し、鋼材Ｓの巻取温度（ＣＴ）を制御する。ランナウトテーブル５には、鋼材Ｓを搬送する複数の搬送ロール５１が鋼材Ｓの搬送方向に沿って配設されている。ランナウトテーブル５の長さ、即ちランナウトテーブル５の鋼材Ｓの搬送方向に沿う長さはＬｅとなっている。 Although not shown, the runout table 5 includes a plurality of banks arranged along the conveyance direction of the steel material S, and each bank has a plurality of nozzles that inject cooling water to the steel material S passing through. is set up. As will be described later, the cooling control unit 14 (described later) controls the number of banks with nozzles that inject cooling water and the transport speed of the steel material S, thereby adjusting the amount of time and amount of cooling water applied to the steel material S. The winding temperature (CT) of S is controlled. A plurality of transport rolls 51 for transporting the steel material S are arranged on the runout table 5 along the transport direction of the steel material S. The length of the runout table 5, that is, the length of the runout table 5 along the conveyance direction of the steel material S is Le.

また、ランナウトテーブル５の出側であって巻取機８の直前には、鋼材Ｓの巻取温度（ＣＴ）を測定する巻取温度計１３が設置されている。
また、巻取機８は、搬送されてくる鋼材Ｓの方向を曲げるピンチロール６と、鋼材Ｓをコイル状に巻取るマンドレル７とを備えている。
ここで、ランナウトテーブル５には、冷却水を噴射するノズルのあるバンクの数及び鋼材Ｓの搬送速度を制御する冷却制御部１４が接続されている。
冷却制御部１４は、鋼材Ｓの巻取温度計１３での巻取温度（ＣＴ）が目標巻取温度（目標ＣＴ）となるように、出側板温度計１０からの仕上圧延出側の鋼材Ｓの温度である板温度（実績ＦＤＴ）に基づいて、ランナウトテーブル５での冷却水を噴射するノズルのあるバンクの数及び鋼材Ｓの搬送速度を制御する。 Further, on the exit side of the runout table 5 and immediately before the winder 8, a winding thermometer 13 for measuring the winding temperature (CT) of the steel material S is installed.
Further, the winding machine 8 includes a pinch roll 6 that bends the direction of the steel material S being conveyed, and a mandrel 7 that winds up the steel material S into a coil shape.
Here, the runout table 5 is connected to a cooling control unit 14 that controls the number of banks with nozzles that spray cooling water and the conveyance speed of the steel material S.
The cooling control unit 14 controls the steel material S on the finish rolling exit side from the exit plate thermometer 10 so that the coiling temperature (CT) of the steel material S at the coiling thermometer 13 becomes the target coiling temperature (target CT). The number of banks with nozzles that inject cooling water on the runout table 5 and the conveyance speed of the steel material S are controlled based on the plate temperature (actual FDT), which is the temperature of .

ここで、冷却制御部１４は、鋼材Ｓの搬送速度の制御に際し、仕上圧延された後の鋼材Ｓの長さＬｓがランナウトテーブル５の長さＬｅよりも短くなる場合、次のように鋼材Ｓの搬送制御を行う。つまり、図４に示すように、鋼材Ｓの先端部Ｓａがランナウトテーブル５に仕上圧延速度（最低速度８０ｍｐｍ、最高速度４００ｍｐｍ）で進入してから当該仕上圧延速度で鋼材Ｓを搬送させ、鋼材Ｓの尾端部Ｓｂが最終スタンドＦ７を抜けた時に、鋼材Ｓを８０ｍｐｍ未満の減速時速度にまで減速させ、当該減速時速度で鋼材Ｓを搬送し、その後、鋼材Ｓの先端部Ｓａがランナウトテーブル５を抜けたときに１５０ｍｐｍから４００ｍｐｍまでの間の巻取時速度にまで加速させ、鋼材Ｓを巻取時速度で巻き取らせる制御を行う。図４において、鋼材Ｓの先端部Ｓａの搬送速度は符号２１、鋼材Ｓの尾端部Ｓｂの搬送速度は符号２２で示されている。 Here, when controlling the conveyance speed of the steel material S, if the length Ls of the steel material S after finish rolling becomes shorter than the length Le of the runout table 5, the cooling control unit 14 controls the steel material S as follows. Conveyance control is performed. That is, as shown in FIG. 4, after the tip Sa of the steel material S enters the runout table 5 at a finish rolling speed (minimum speed 80 mpm, maximum speed 400 mpm), the steel material S is conveyed at the finish rolling speed, and the steel material S When the tail end Sb of the steel material S passes through the final stand F7, the steel material S is decelerated to a deceleration speed of less than 80 mpm, the steel material S is conveyed at the deceleration speed, and then the tip end Sa of the steel material S is transferred to the runout table. 5, the steel material S is accelerated to a winding speed between 150 mpm and 400 mpm, and the steel material S is controlled to be wound at the winding speed. In FIG. 4, the conveyance speed of the leading end Sa of the steel material S is indicated by reference numeral 21, and the conveyance speed of the tail end portion Sb of the steel material S is indicated by reference numeral 22.

また、冷却制御部１４は、鋼材Ｓの搬送速度の制御に際し、仕上圧延された後の鋼材Ｓの長さＬｓがランナウトテーブル５の長さＬｅ以上の場合、次のように鋼材Ｓの搬送制御を行う。つまり、図５に示すように、鋼材Ｓの先端部Ｓａがランナウトテーブル５に仕上圧延速度（最低速度８０ｍｐｍ、最高速度４００ｍｐｍ）で進入してから当該仕上圧延速度で鋼材Ｓを搬送させ、そのままの速度で鋼材Ｓを巻き取らせる制御を行う。図５において、鋼材Ｓの先端部Ｓａの搬送速度は符号２１、鋼材Ｓの尾端部Ｓｂの搬送速度は符号２２で示されている。
ここで、仕上圧延された後の鋼材Ｓの長さＬｓは、次の（１）式により定義される。
Ｌｓ＝Ｍ／（ρＴＷ） ・・・（１）
ここで、Ｍは鋼材Ｓの重量、ρは鋼材Ｓの密度、Ｔは仕上圧延後の鋼材Ｓの板厚、Ｗは仕上圧延後の鋼材Ｓの板幅である。なお、ρは例えば７．８５ｔｏｎ／ｍ３の値が用いられる。 In addition, when controlling the conveyance speed of the steel material S, the cooling control unit 14 controls the conveyance of the steel material S as follows when the length Ls of the steel material S after finish rolling is equal to or greater than the length Le of the runout table 5. I do. That is, as shown in FIG. 5, the tip Sa of the steel material S enters the runout table 5 at a finish rolling speed (minimum speed 80 mpm, maximum speed 400 mpm), and then the steel material S is conveyed at the finish rolling speed, and the steel material S is conveyed as it is. Control is performed to wind up the steel material S at a certain speed. In FIG. 5, the conveying speed of the leading end Sa of the steel material S is indicated by 21, and the conveying speed of the tail end Sb of the steel material S is indicated by 22.
Here, the length Ls of the steel material S after finish rolling is defined by the following equation (1).
Ls=M/(ρTW)...(1)
Here, M is the weight of the steel material S, ρ is the density of the steel material S, T is the plate thickness of the steel material S after finish rolling, and W is the plate width of the steel material S after finish rolling. Note that, for example, a value of 7.85 ton/m 3 is used for ρ.

冷却制御部１４は、上位計算機１５から冷却される鋼材Ｓの重量Ｍ及び鋼材Ｓの密度ρの情報を受け取り、仕上圧延機４の出側に設置された出側板厚計１１で測定された板厚Ｔの情報を受け取る。更に、冷却制御部１４は、仕上圧延機４の出側に設置された出側板幅計１２で測定された仕上圧延後の鋼材Ｓの板幅Ｗの情報を受け取り、仕上圧延された後の鋼材Ｓの長さＬｓを（１）式により算出する。
そして、冷却制御部１４は、算出された仕上圧延された後の鋼材Ｓの長さＬｓがランナウトテーブル５の長さＬｅよりも短いか否かを次の（２）式により判断する。
Ｌｓ＜Ｌｅ ・・・（２）
なお、ランナウトテーブル５の長さＬｅの情報は、上位計算機１５から冷却制御部１４に入力される。 The cooling control unit 14 receives information on the weight M of the steel material S to be cooled and the density ρ of the steel material S from the host computer 15, and receives the information on the weight M of the steel material S to be cooled and the density ρ of the steel material S, and calculates the thickness of the plate measured by the outlet side plate thickness gauge 11 installed on the outlet side of the finishing rolling mill 4. Receive information on thickness T. Furthermore, the cooling control unit 14 receives information on the plate width W of the steel material S after finish rolling, which is measured by the outlet side plate width meter 12 installed on the outlet side of the finishing rolling mill 4, and receives information on the plate width W of the steel material S after finish rolling. The length Ls of S is calculated using equation (1).
Then, the cooling control unit 14 determines whether the calculated length Ls of the finished rolled steel material S is shorter than the length Le of the runout table 5 using the following equation (2).
Ls<Le...(2)
Note that information on the length Le of the runout table 5 is input from the host computer 15 to the cooling control unit 14.

そして、（２）式を満たすとき、冷却制御部１４は、仕上圧延された後の鋼材Ｓの長さＬｓがランナウトテーブル５の長さＬｅよりも短いと判断する。そのときの、鋼材Ｓと仕上圧延機４の最終スタンドＦ７、ランナウトテーブル５、及び巻取機８の配置を図２に示す。また、（２）式を満たさないとき、冷却制御部１４は、仕上圧延された後の鋼材Ｓの長さＬｓがランナウトテーブル５の長さＬｅ以上と判断する。そのときの、鋼材Ｓと仕上圧延機４の最終スタンドＦ７、ランナウトテーブル５、及び巻取機８の配置を図３に示す。 Then, when formula (2) is satisfied, the cooling control unit 14 determines that the length Ls of the steel material S after finish rolling is shorter than the length Le of the runout table 5. FIG. 2 shows the arrangement of the steel material S, the final stand F7 of the finishing rolling mill 4, the runout table 5, and the winding machine 8 at that time. Further, when the formula (2) is not satisfied, the cooling control unit 14 determines that the length Ls of the steel material S after finish rolling is equal to or greater than the length Le of the runout table 5. FIG. 3 shows the arrangement of the steel material S, the final stand F7 of the finishing rolling mill 4, the runout table 5, and the winding machine 8 at that time.

図２から分かるように、仕上圧延された後の鋼材Ｓの長さＬｓがランナウトテーブル５の長さＬｅよりも短いとき、鋼材Ｓの尾端部Ｓｂが最終スタンドＦ７を抜けた時、鋼材Ｓの先端部Ｓａが巻取機８に到達しておらず、鋼材Ｓを拘束するものはなく、鋼材Ｓはランナウトテーブル５に備えられている搬送ロール５１に乗っている。このため、冷却制御部１４は、このとき、搬送ロール５１の回転速度を制御することで鋼材Ｓを前述のように減速させたり加速させたりする制御を行うことができる。 As can be seen from FIG. 2, when the length Ls of the steel material S after finish rolling is shorter than the length Le of the runout table 5, when the tail end Sb of the steel material S passes through the final stand F7, the steel material S The leading end Sa has not reached the winder 8, there is nothing to restrain the steel material S, and the steel material S is on the conveyance roll 51 provided on the runout table 5. Therefore, at this time, the cooling control unit 14 can perform control to decelerate or accelerate the steel material S as described above by controlling the rotational speed of the conveyance roll 51.

一方、図３からわかるように、仕上圧延された後の鋼材Ｓの長さＬｓがランナウトテーブル５の長さＬｅ以上のとき、鋼材Ｓの尾端部Ｓｂが最終スタンドＦ７を抜けた時、鋼材Ｓの先端部Ｓａが巻取機８に到達している場合が多い。このため、冷却制御部１４は、鋼材Ｓの搬送速度を加減速する制御が行えず、仕上圧延速度を維持するように搬送ロール５１の回転速度を制御する。
本実施形態において、例えば、鋼材Ｓの重量Ｍが３２ｔｏｎの場合、仕上圧延後の鋼材Ｓの板幅Ｗが２０００ｍｍでは、仕上圧延後の鋼材Ｓの板厚Ｔが１９ｍｍ以上のときに、仕上圧延された後の鋼材Ｓの長さＬｓが（１）式により１０７．４ｍ以下になるため、ランナウトテーブルの長さＬｅが１４０ｍの場合は、（２）式により本発明による制御が可能となる。 On the other hand, as can be seen from FIG. 3, when the length Ls of the steel material S after finishing rolling is greater than or equal to the length Le of the runout table 5, when the tail end Sb of the steel material S passes through the final stand F7, the steel material In many cases, the tip Sa of S has reached the winder 8. For this reason, the cooling control unit 14 cannot perform control to accelerate or decelerate the conveyance speed of the steel material S, and controls the rotation speed of the conveyance roll 51 so as to maintain the finish rolling speed.
In this embodiment, for example, when the weight M of the steel material S is 32 tons, when the plate width W of the steel material S after finish rolling is 2000 mm, when the plate thickness T of the steel material S after finish rolling is 19 mm or more, the finish rolling Since the length Ls of the steel material S after the runout is 107.4 m or less according to equation (1), when the length Le of the runout table is 140 m, control according to the present invention is possible using equation (2).

なお、図６には、仕上圧延された後の長さＬｓがランナウトテーブル５の長さＬｅよりも短くなる鋼材Ｓを仕上圧延速度から減速させずに定速で搬送させた後、加速させたときの、鋼材Ｓの先端部Ｓａ及び尾端部Ｓｂの搬送速度と仕上圧延機４の最終スタンドＦ７出側からのランナウトテーブル５上の位置との関係が示されている。 In addition, in FIG. 6, a steel material S whose length Ls after finish rolling is shorter than the length Le of the runout table 5 is conveyed at a constant speed without decelerating from the finish rolling speed, and then accelerated. The relationship between the conveyance speed of the leading end Sa and tail end Sb of the steel material S and the position on the runout table 5 from the exit side of the final stand F7 of the finishing rolling mill 4 at this time is shown.

図６に示すように、仕上圧延された後の鋼材Ｓの長さＬｓがランナウトテーブル５の長さＬｅよりも短くなる場合において、当該鋼材Ｓが仕上圧延速度（一般的に最低速度が８０ｍｐｍ、最高速度が４００ｍｐｍ）でランナウトテーブル５を通過すると、当該鋼材Ｓのランナウトテーブル５を通過する時間が短くなる。その際に、鋼材Ｓが厚物の場合には、冷却時間が短いことから、鋼材ＳのＣＴが目標ＣＴに達成しない場合がある。鋼材Ｓの冷却制御において冷却水の噴射量を増加（すべてのバンクから冷却水を噴射し、各バンクでの冷却水量を増加）すれば目標ＣＴを確保できることがあるが、冷却設備の関係で冷却水の噴射量を増加することにも限界があり、目標の冷却水噴射量を得られないことがあるからである。一方、この場合において、図６では、仕上圧延速度で鋼材Ｓを搬送させた後に、鋼材Ｓの先端部Ｓａが巻取機８に巻取り開始されるまでの間に、鋼材Ｓの搬送速度を巻取時速度（１５０ｍｐｍから４００ｍｐｍ程度）にまで加速させるので、鋼材Ｓは巻取機８に円滑に巻付くことができる。 As shown in FIG. 6, when the length Ls of the steel material S after finishing rolling is shorter than the length Le of the runout table 5, the steel material S is finished rolling at a finish rolling speed (generally the minimum speed is 80 mpm, If the steel material S passes through the runout table 5 at a maximum speed of 400 mpm, the time for the steel material S to pass through the runout table 5 becomes shorter. At this time, if the steel material S is thick, the CT of the steel material S may not reach the target CT because the cooling time is short. In cooling control of steel material S, it is possible to secure the target CT by increasing the injection amount of cooling water (injecting cooling water from all banks and increasing the amount of cooling water in each bank), but due to the cooling equipment, cooling This is because there is a limit to increasing the amount of water injection, and the target amount of cooling water injection may not be obtained. On the other hand, in this case, in FIG. 6, after the steel material S is conveyed at the finish rolling speed, the conveyance speed of the steel material S is changed until the winding machine 8 starts winding up the tip part Sa of the steel material S. Since the winding speed is accelerated to the winding speed (approximately 150 mpm to 400 mpm), the steel material S can be smoothly wound around the winding machine 8.

本実施形態においては、仕上圧延後の長さＬｓがランナウトテーブル５の長さLeよりも短くなる鋼材Ｓの巻取温度の目標巻取温度の達成と当該鋼材Ｓの巻取機８での適切な巻付きの両立を可能とすべく、冷却制御部１４は、鋼材Ｓの搬送速度の制御に際し、仕上圧延された後の鋼材Ｓの長さＬｓがランナウトテーブル５の長さＬｅよりも短くなる場合、図６に示すような鋼材Ｓの搬送制御は行わずに、図４に示すような鋼材Ｓの搬送制御を行うこととしている。 In this embodiment, the aim is to achieve the target winding temperature of the steel material S at which the length Ls after finish rolling is shorter than the length Le of the runout table 5, and to ensure that the steel material S is properly rolled in the winder 8. In order to achieve both smooth winding, the cooling control unit 14 controls the conveyance speed of the steel material S so that the length Ls of the steel material S after finish rolling is shorter than the length Le of the runout table 5. In this case, the conveyance control of the steel material S as shown in FIG. 4 is performed without performing the conveyance control of the steel material S as shown in FIG.

次に、冷却制御部１４による鋼材Ｓの搬送制御方法について説明する。冷却制御部１４は、冷却制御部１４における冷却制御機能及び鋼材搬送制御機能をコンピュータソフトウェア上でプログラムによって実行するための演算処理機能を有するコンピュータシステムである。そして、このコンピュータシステムは、ＲＯＭ，ＲＡＭ，ＣＰＵ等を備えて構成され、ＲＯＭ等に予め記憶された各種専用のプログラムによって、冷却制御機能をソフトウェア上で実行する。 Next, a method of controlling the conveyance of the steel material S by the cooling control section 14 will be explained. The cooling control unit 14 is a computer system having an arithmetic processing function for executing the cooling control function and the steel material transport control function in the cooling control unit 14 by a program on computer software. This computer system includes a ROM, a RAM, a CPU, and the like, and executes the cooling control function on software using various dedicated programs stored in the ROM and the like in advance.

鋼材Ｓは、仕上圧延機４によって仕上圧延された後、その先端部Ｓａが仕上圧延速度（一般的に最低速度８０ｍｐｍ、最高速度４００ｍｐｍ）でランナウトテーブル５に進入する。冷却制御部１４は、鋼材Ｓの搬送方向の位置を熱間圧延ライン１における搬送ローラからのトラッキング情報によって、常に、把握している。
ここで、冷却制御部１４は、出側板厚計１１からの仕上圧延された後の鋼材Ｓの板厚Ｔの情報、出側板幅計１２からの仕上圧延された後の鋼材Ｓの板幅Ｗの情報、及び上位計算機１５からの鋼材Ｓの重量Ｍの情報、鋼材Ｓの密度ρの情報に基づいて、仕上圧延された後の鋼材Ｓの長さＬｓを前述の（１）式により算出する。 After the steel material S is finish rolled by the finish rolling mill 4, its leading end Sa enters the runout table 5 at a finish rolling speed (generally a minimum speed of 80 mpm and a maximum speed of 400 mpm). The cooling control unit 14 always knows the position of the steel material S in the conveyance direction based on tracking information from the conveyance rollers in the hot rolling line 1.
Here, the cooling control unit 14 receives information about the plate thickness T of the steel material S after finish rolling from the outlet side plate thickness gauge 11, and the plate width W of the steel material S after finish rolling from the outlet side plate width gauge 12. Based on the information on the weight M of the steel material S and the information on the density ρ of the steel material S from the host computer 15, the length Ls of the steel material S after finish rolling is calculated using the above-mentioned formula (1). .

そして、冷却制御部１４は、上位計算機１５からランナウトテーブル５の長さＬｅの情報を取得し、算出した仕上圧延された後の鋼材Ｓの長さＬｓがランナウトテーブル５の長さＬｅよりも短いか否かを前述の（２）式により判断する。
そして、冷却制御部１４は、仕上圧延後の鋼材Ｓの長さＬｓがランナウトテーブル５の長さＬｅよりも短いと判断しているときには、次のように鋼材Ｓの搬送制御を行う。
即ち、冷却制御部１４は、鋼材Ｓの先端部Ｓａがランナウトテーブル５に仕上圧延速度（一般的に最低速度８０ｍｐｍ、最高速度４００ｍｐｍ）で進入してからその仕上圧延速度で鋼材Ｓを搬送させるよう搬送ロール５１に回転速度指令を送出する。
そして、鋼材Ｓの尾端部Ｓｂが最終スタンドＦ７を抜けた時、冷却制御部１４は、鋼材Ｓを８０ｍｐｍ未満の減速時速度にまで減速させ、当該減速時速度で鋼材Ｓを搬送するよう搬送ロール５１に回転速度指令を送出する。 Then, the cooling control unit 14 acquires information on the length Le of the runout table 5 from the host computer 15, and the calculated length Ls of the steel material S after finish rolling is shorter than the length Le of the runout table 5. It is determined whether or not it is based on the above-mentioned equation (2).
When the cooling control unit 14 determines that the length Ls of the steel material S after finish rolling is shorter than the length Le of the runout table 5, the cooling control section 14 controls the conveyance of the steel material S as follows.
That is, the cooling control unit 14 causes the tip portion Sa of the steel material S to enter the runout table 5 at a finish rolling speed (generally a minimum speed of 80 mpm and a maximum speed of 400 mpm), and then transports the steel material S at that finish rolling speed. A rotational speed command is sent to the transport roll 51.
Then, when the tail end Sb of the steel material S passes through the final stand F7, the cooling control unit 14 decelerates the steel material S to a deceleration speed of less than 80 mpm, and transports the steel material S at the deceleration speed. A rotational speed command is sent to the roll 51.

次いで、鋼材Ｓの先端部Ｓａがランナウトテーブル５を抜けた時、鋼材Ｓの搬送速度が１５０ｍｐｍから４００ｍｐｍまでの間の巻取時速度となるまで加速させ、鋼材Ｓをその巻取時速度で巻き取らせるように搬送ロール５１に回転速度指令を送出する。
一方、冷却制御部１４は、仕上圧延後の鋼材Ｓの長さＬｓがランナウトテーブル５の長さＬｅ以上と判断しているときには、次のように鋼材Ｓの搬送制御を行う。
即ち、冷却制御部１４は、鋼材Ｓの先端部Ｓａがランナウトテーブル５に仕上圧延速度（一般的に最低速度８０ｍｐｍ、最高速度４００ｍｐｍ）で進入してからその仕上圧延速度で鋼材Ｓを搬送させるよう搬送ロール５１に回転速度指令を送出する。 Next, when the tip Sa of the steel material S passes through the runout table 5, the conveying speed of the steel material S is accelerated to a winding speed between 150 mpm and 400 mpm, and the steel material S is wound at that winding speed. A rotation speed command is sent to the conveyor roll 51 so as to cause the rotation speed to change.
On the other hand, when the cooling control unit 14 determines that the length Ls of the steel material S after finish rolling is greater than or equal to the length Le of the runout table 5, the cooling control section 14 performs conveyance control of the steel material S as follows.
That is, the cooling control unit 14 causes the tip portion Sa of the steel material S to enter the runout table 5 at a finish rolling speed (generally a minimum speed of 80 mpm and a maximum speed of 400 mpm), and then transports the steel material S at that finish rolling speed. A rotational speed command is sent to the transport roll 51.

次いで、鋼材Ｓの先端部Ｓａがランナウトテーブル５を抜けた時、鋼材Ｓの搬送速度をそのまま維持させて、鋼材Ｓをその維持した巻取時速度で巻き取らせるように搬送ロール５１に回転速度指令を送出する
これにより、冷却制御部１４による鋼材Ｓの搬送速度制御は終了する。
なお、冷却制御部１４は、冷却制御部１４による鋼材Ｓの搬送速度制御の際に、鋼材Ｓの巻取温度計１３での巻取温度（ＣＴ）が目標巻取温度（目標ＣＴ）となるように、ランナウトテーブル５での冷却水を噴射するノズルのあるバンクの数を設定し、そのバンクに噴射指令を送出し、鋼材Ｓの冷却を行う。 Next, when the tip Sa of the steel material S passes through the runout table 5, the rotational speed is set on the conveyor roll 51 so that the conveyance speed of the steel material S is maintained as it is and the steel material S is wound up at the maintained winding speed. Sending the command As a result, the conveyance speed control of the steel material S by the cooling control unit 14 ends.
Note that the cooling control unit 14 controls the coiling temperature (CT) of the steel material S measured by the coiling thermometer 13 to become the target coiling temperature (target CT) when the cooling control unit 14 controls the conveyance speed of the steel material S. The number of banks with nozzles that inject cooling water in the runout table 5 is set, and an injection command is sent to the bank to cool the steel material S.

このように、本実施形態に係る熱延鋼帯の製造方法及び製造装置によれば、仕上圧延された後の鋼材の長さＬｓがランナウトテーブル５の長さＬｅよりも短くなる場合、次のように鋼材Ｓの搬送制御を行う。即ち、ランナウトテーブル５に鋼材Ｓの先端部Ｓａが仕上圧延速度（一般的に最低速度８０ｍｐｍ、最高速度４００ｍｐｍ）で進入を開始した後に、鋼材Ｓの搬送速度を８０ｍｐｍ未満の減速時速度にまで減速させて、当該減速時速度で鋼材Ｓを搬送し、その後に、鋼材Ｓの先端部Ｓａが巻取機８に巻取り開始されるまでの間に、鋼材Ｓの搬送速度を１５０ｍｐｍから４００ｍｐｍまでの間の巻取時速度にまで加速させるよう制御する。 As described above, according to the hot-rolled steel strip manufacturing method and manufacturing apparatus according to the present embodiment, when the length Ls of the steel material after finish rolling becomes shorter than the length Le of the runout table 5, the following The conveyance of the steel material S is controlled as follows. That is, after the leading end Sa of the steel material S starts to enter the runout table 5 at a finish rolling speed (generally a minimum speed of 80 mpm and a maximum speed of 400 mpm), the conveyance speed of the steel material S is reduced to a deceleration speed of less than 80 mpm. Then, the steel material S is conveyed at the deceleration speed, and thereafter, the conveyance speed of the steel material S is increased from 150 mpm to 400 mpm until the winding machine 8 starts winding up the leading end Sa of the steel material S. The winding speed is controlled to be accelerated to a winding speed between

これにより、仕上圧延後の長さＬｓがランナウトテーブル５の長さＬｅよりも短くなる鋼材Ｓの巻取温度（ＣＴ）の目標巻取温度（目標ＣＴ）の達成と当該鋼材Ｓの巻取機８での適切な巻付きの両立を可能とした熱延鋼帯の製造方法及び製造装置を提供できる。
つまり、当該鋼材Ｓが仕上圧延速度（一般的に最低速度が８０ｍｐｍ、最高速度が４００ｍｐｍ）でランナウトテーブル５を通過すると、当該鋼材のランナウトテーブル５を通過する時間が短くなる。その際に、鋼材が厚物の場合には、冷却時間が短いことから、鋼材ＳのＣＴが目標ＣＴに達成しない場合がある。鋼材の冷却制御において冷却水の噴射量を増加（すべてのバンクから冷却水を噴射し、各バンクでの冷却水量を増加）すれば目標ＣＴを確保できることがあるが、冷却設備の関係で冷却水の噴射量を増加することにも限界があり、目標の冷却水噴射量を得られないことがあるからである。 As a result, the length Ls after finish rolling is shorter than the length Le of the runout table 5. The coiling temperature (CT) of the steel material S reaches the target coiling temperature (target CT) and the winder of the steel material S It is possible to provide a method and apparatus for manufacturing a hot-rolled steel strip that can achieve both appropriate winding.
That is, when the steel material S passes through the runout table 5 at a finish rolling speed (generally the minimum speed is 80 mpm and the maximum speed is 400 mpm), the time for the steel material to pass through the runout table 5 becomes shorter. At this time, if the steel material is thick, the CT of the steel material S may not reach the target CT because the cooling time is short. In cooling control of steel materials, it is possible to secure the target CT by increasing the injection amount of cooling water (injecting cooling water from all banks and increasing the amount of cooling water in each bank), but due to the cooling equipment, the cooling water This is because there is a limit to increasing the injection amount of cooling water, and it may not be possible to obtain the target cooling water injection amount.

一方、鋼材Ｓの搬送速度を仕上圧延速度よりも遅くしてその搬送速度でランナウトテーブルにおいてその鋼材Ｓが通過すると、前述したように、目標ＣＴを達成することは可能となるが、巻取機での巻付性が問題となる。
これに対して、本実施形態のように、ランナウトテーブル５に鋼材Ｓの先端部Ｓａが仕上圧延速度（一般的に最低速度８０ｍｐｍ、最高速度４００ｍｐｍ）で進入を開始した後に、鋼材Ｓの搬送速度を８０ｍｐｍ未満の減速時速度にまで減速させて、当該減速時速度で鋼材Ｓを搬送する。これにより、冷却時間を長くとることができ、鋼材ＳのＣＴを目標ＣＴとすることができる。 On the other hand, if the conveyance speed of the steel material S is made slower than the finish rolling speed and the steel material S passes through the runout table at that conveyance speed, it is possible to achieve the target CT as described above, but the winding machine Wrapping properties are a problem.
On the other hand, as in the present embodiment, after the leading end Sa of the steel material S starts to enter the runout table 5 at the finish rolling speed (generally a minimum speed of 80 mpm and a maximum speed of 400 mpm), the conveyance speed of the steel material S is is decelerated to a deceleration speed of less than 80 mpm, and the steel material S is conveyed at the deceleration speed. Thereby, the cooling time can be increased, and the CT of the steel material S can be set to the target CT.

また、本実施形態では、減速時速度で鋼材Ｓを搬送させた後に、鋼材Ｓの先端部Ｓａが巻取機８に巻取り開始されるまでの間に、鋼材Ｓの搬送速度を１５０ｍｐｍから４００ｍｐｍまでの間の巻取時速度にまで加速させるよう制御する。これにより、鋼材Ｓは巻取機８に円滑に巻付くことができる。なお、鋼材Ｓの巻取時速度が１５０ｍｐｍよりも遅いと、鋼材Ｓの持つ運動エネルギーが小さいため先端部Ｓａが適切に塑性変形せず、マンドレル７にうまく鋼材Ｓが巻付かない。一方、鋼材Ｓの巻取時速度が４００ｍｐｍよりも速いと、鋼材Ｓの先端部Ｓａをピンチロール６で抑えることができずに、マンドレル７に鋼材Ｓの先端部Ｓａが進入せずにトラブルとなることがある。
なお、８０ｍｐｍ未満の減速時速度を具体的にどれくらいにするかについては、目標ＣＴによって適宜決定される。また、減速時速度の最低速度は、１０ｍｐｍとすることが好ましい。減速時速度の最低速度が、１０ｍｐｍよりも遅いと、冷却水が鋼材Ｓの上面に滞留し温度ムラが発生するという不都合がある。 Furthermore, in the present embodiment, after the steel material S is conveyed at a decelerated speed, the conveyance speed of the steel material S is changed from 150 mpm to 400 mpm before the winding machine 8 starts winding up the tip end Sa of the steel material S. The winding speed is controlled to be accelerated to the winding speed up to that point. Thereby, the steel material S can be smoothly wound around the winder 8. Note that if the winding speed of the steel material S is lower than 150 mpm, the tip portion Sa will not be appropriately plastically deformed because the kinetic energy of the steel material S is small, and the steel material S will not be wound around the mandrel 7 properly. On the other hand, if the winding speed of the steel material S is higher than 400 mpm, the tip portion Sa of the steel material S cannot be suppressed by the pinch roll 6, and the tip portion Sa of the steel material S does not enter the mandrel 7, causing trouble. It may happen.
Note that the specific speed to be set during deceleration below 80 mpm is determined as appropriate based on the target CT. Further, it is preferable that the minimum speed during deceleration is 10 mpm. If the minimum speed during deceleration is lower than 10 mpm, there is a disadvantage that the cooling water stays on the upper surface of the steel material S, causing temperature unevenness.

以上、本発明の実施形態について説明してきたが、本発明はこれに限定されずに種々の変更、改良を行うことができる。
例えば、冷却制御部１４がランナウトテーブル５に鋼材Ｓの先端部Ｓａが仕上圧延速度で進入を開始した後に、鋼材Ｓの搬送速度を減速時速度にまで減速させる開始トリガーは、鋼材Ｓの尾端部Ｓｂが最終スタンドＦ７を抜けた時である必要は必ずしもない。
また、冷却制御部１４が、減速時速度で鋼材Ｓを搬送させた後に、鋼材Ｓの搬送速度を１５０ｍｐｍから４００ｍｐｍまでの間の巻取時速度にまで加速させる開始トリガーは、鋼材Ｓの先端部Ｓａがランナウトテーブル５を抜けたときに限らず、鋼材Ｓの先端部Ｓａが巻取機８に巻取り開始されるまでの間であればよい。 Although the embodiments of the present invention have been described above, the present invention is not limited thereto, and various changes and improvements can be made.
For example, after the leading end Sa of the steel material S starts entering the runout table 5 at the finishing rolling speed, the start trigger for reducing the conveyance speed of the steel material S to the deceleration speed is the It is not necessarily the time when section Sb passes through the final stand F7.
Further, the start trigger for causing the cooling control unit 14 to accelerate the conveying speed of the steel material S to a winding speed between 150 mpm and 400 mpm after transporting the steel material S at a decelerating speed is a trigger for the tip of the steel material S. This is not limited to when Sa passes through the runout table 5, but may be any time before the tip Sa of the steel material S starts being wound up by the winding machine 8.

次に、本発明者らが行った実施例について説明する。以下に述べる参考例１、比較例１～４、及び実施例１～４の場合に、巻取温度（ＣＴ）判定及び巻取判定を行った。その結果を表１に示す。表１において、巻取温度（ＣＴ）判定に際しては、実績ＣＴが目標ＣＴ以下の場合には「○」、実績ＣＴが目標ＣＴよりも高い場合には「×」とした。また、巻取判定に際しては、鋼材Ｓが巻取機８（マンドレル７）に巻付いた場合を「○」、鋼材Ｓが巻取機８（マンドレル７）に巻付かない場合を「×」とした。また、長さ判定において、仕上圧延後の鋼材Ｓの長さＬｓがランナウトテーブル５の長さＬｅよりも短い場合を「○」、長い場合を「×」とした。 Next, an example carried out by the present inventors will be described. In the case of Reference Example 1, Comparative Examples 1 to 4, and Examples 1 to 4 described below, coiling temperature (CT) determination and coiling determination were performed. The results are shown in Table 1. In Table 1, when determining the winding temperature (CT), when the actual CT was less than or equal to the target CT, it was marked as "○", and when the actual CT was higher than the target CT, it was marked as "x". In addition, when determining the winding, if the steel material S is wound around the winder 8 (mandrel 7), it is marked as "○", and if the steel material S is not wound around the winder 8 (mandrel 7), it is marked as "x". did. Further, in the length determination, when the length Ls of the steel material S after finish rolling was shorter than the length Le of the runout table 5, it was evaluated as "○", and when it was longer, it was evaluated as "×".

Figure 0007342898000001
Figure 0007342898000001

ここで、参考例１、比較例１～４、及び実施例１～４では、７スタンドの仕上圧延機４、長さＬｅが１４０ｍのランナウトテーブル５、及び巻取機８を具備する熱間圧延ライン１で検証された。仕上圧延機４の最終スタンドＦ７の速度（仕上圧延速度）はどの条件においても８０ｍｐｍとした。鋼材Ｓの目標ＣＴは、求められる特性から５５０℃とした。 Here, in Reference Example 1, Comparative Examples 1 to 4, and Examples 1 to 4, a hot rolling mill equipped with a seven-stand finishing mill 4, a runout table 5 with a length Le of 140 m, and a winding machine 8 was used. Verified on line 1. The speed of the final stand F7 of the finishing mill 4 (finish rolling speed) was 80 mpm under all conditions. The target CT of the steel material S was set to 550°C from the required characteristics.

そして、参考例１は、仕上圧延後の鋼材Ｓの長さＬｓがランナウトテーブル５の長さＬｅよりも長く前提から外れる事例である。参考例１では、鋼材Ｓの単重が３２ｔｏｎの場合において、仕上圧延後の鋼材Ｓの板厚が１９ｍｍと厚いが、板幅が１５００ｍｍと小さいため、鋼材Ｓの長さＬｓ（１４３．２ｍ）がランナウトテーブル５の長さＬｅ（１４０ｍ）よりも長くなっている。参考例１では、鋼材Ｓの先端部Ｓａがランナウトテーブル５に８０ｍｐｍの仕上圧延速度で進入してからその仕上圧延速度で鋼材Ｓを搬送させ、そのままの巻取時速度で鋼材Ｓを巻き取らせる制御を行った。参考例１では、実績ＣＴが５６１℃で目標ＣＴ５５０℃よりも高くなり、ＣＴ判定の結果は「×」となった。また、仕上圧延後の鋼材Ｓの長さＬｓがランナウトテーブル５の長さＬｅよりも長く、鋼材Ｓの先端部Ｓａが巻取機８に到達する前にその搬送速度を加速することができず、巻取時速度は８０ｍｐｍで鋼材Ｓは巻取機８に巻付かず、巻取判定の結果は「×」となった。 Reference example 1 is a case in which the length Ls of the steel material S after finish rolling is longer than the length Le of the runout table 5, which deviates from the assumption. In Reference Example 1, when the unit weight of the steel material S is 32 tons, the plate thickness of the steel material S after finish rolling is as thick as 19 mm, but the plate width is as small as 1500 mm, so the length of the steel material S is Ls (143.2 m). is longer than the length Le (140 m) of the runout table 5. In Reference Example 1, the tip Sa of the steel material S enters the runout table 5 at a finish rolling speed of 80 mpm, and then the steel material S is conveyed at that finish rolling speed, and the steel material S is wound up at the same winding speed. controlled. In Reference Example 1, the actual CT was 561° C., which was higher than the target CT of 550° C., and the CT determination result was “×”. In addition, the length Ls of the steel material S after finish rolling is longer than the length Le of the runout table 5, and the conveyance speed cannot be accelerated before the tip portion Sa of the steel material S reaches the winder 8. , the winding speed was 80 mpm, the steel material S was not wound around the winder 8, and the result of the winding determination was "x".

また、比較例１は、仕上圧延後の鋼材Ｓの板厚が１９ｍｍ、板幅が２０００ｍｍ、単重３２ｔｏｎ、長さが１０７．１ｍであり、鋼材Ｓの先端部Ｓａがランナウトテーブル５に８０ｍｐｍの仕上圧延速度で進入してからその仕上圧延速度で鋼材Ｓを搬送させ、鋼材Ｓの先端部Ｓａがランナウトテーブル５を抜けたときに１５０ｍｐｍの巻取時速度まで加速させ、鋼材Ｓを巻取時速度で巻き取らせる制御を行った。比較例１では、鋼材Ｓの単重３２ｔｏｎの場合において、板厚が１９ｍｍと厚く板幅が２０００ｍｍと大きいため、仕上圧延後の鋼材Ｓの長さＬｓ（１０７．１ｍ）がランナウトテーブル５の長さＬｅ（１４０ｍ）よりも短くなっている。比較例１では、ランナウトテーブル５での搬送速度が速いため、実績ＣＴが５８２℃で目標ＣＴ５５０℃よりも高く、ＣＴ判定の結果は「×」となった。一方、鋼材Ｓの先端部Ｓａが巻取機８に到達する前にその搬送速度を１５０ｍｐｍの巻取時速度まで加速したため、鋼材Ｓは巻取機８に巻付き、巻取判定の結果は「○」となった。 In addition, in Comparative Example 1, the plate thickness of the steel material S after finish rolling is 19 mm, the plate width is 2000 mm, the unit weight is 32 tons, and the length is 107.1 m. After entering the steel material S at the finishing rolling speed, the steel material S is conveyed at that finishing rolling speed, and when the tip part Sa of the steel material S passes through the runout table 5, it is accelerated to a winding speed of 150 mpm, and the steel material S is rolled up. The winding speed was controlled. In Comparative Example 1, when the steel material S has a unit weight of 32 tons, the plate thickness is as thick as 19 mm and the plate width is as large as 2000 mm. It is shorter than Le (140m). In Comparative Example 1, since the conveyance speed in the runout table 5 was fast, the actual CT was 582°C, which was higher than the target CT of 550°C, and the CT determination result was "x". On the other hand, before the tip Sa of the steel material S reaches the winder 8, the conveyance speed is accelerated to the winding speed of 150 mpm, so the steel material S is wound around the winder 8, and the result of the winding determination is " ○”.

また、比較例２は、仕上圧延後の鋼材Ｓの板厚が３０ｍｍ、板幅が２０００ｍｍ、単重３２ｔｏｎ、長さが６８．０ｍであり、鋼材Ｓの先端部Ｓａがランナウトテーブル５に８０ｍｐｍの仕上圧延速度で進入してからその仕上圧延速度で鋼材Ｓを搬送させ、鋼材Ｓの先端部Ｓａがランナウトテーブル５を抜けたときに１５０ｍｐｍの巻取時速度まで加速させ、鋼材Ｓを巻取時速度で巻き取らせる制御を行った。比較例２では、鋼材Ｓの単重３２ｔｏｎの場合において、板厚が３０ｍｍと厚く板幅が２０００ｍｍと大きいため仕上圧延後の鋼材Ｓの長さＬｓ（６８．０ｍ）がランナウトテーブル５の長さＬｅ（１４０ｍ）よりも短くなっている。比較例２では、ランナウトテーブル５での搬送速度が速いため、実績ＣＴが６５５℃で目標ＣＴ５５０℃よりも高く、ＣＴ判定の結果は「×」となった。一方、鋼材Ｓの先端部Ｓａが巻取機８に到達する前にその搬送速度を１５０ｍｐｍの巻取時速度まで加速したため、鋼材Ｓは巻取機８に巻付き、巻取判定の結果は「○」となった。 In addition, in Comparative Example 2, the plate thickness of the steel material S after finish rolling is 30 mm, the plate width is 2000 mm, the unit weight is 32 tons, and the length is 68.0 m. After entering the steel material S at the finishing rolling speed, the steel material S is conveyed at that finishing rolling speed, and when the tip part Sa of the steel material S passes through the runout table 5, it is accelerated to a winding speed of 150 mpm, and the steel material S is rolled up. The winding speed was controlled. In Comparative Example 2, when the unit weight of the steel material S is 32 tons, the plate thickness is as thick as 30 mm and the plate width is as large as 2000 mm, so the length Ls (68.0 m) of the steel material S after finish rolling is the length of the runout table 5. It is shorter than Le (140m). In Comparative Example 2, the actual CT was 655° C., which was higher than the target CT of 550° C., and the CT determination result was “x” because the conveyance speed at the runout table 5 was fast. On the other hand, before the tip Sa of the steel material S reaches the winder 8, the conveyance speed is accelerated to the winding speed of 150 mpm, so the steel material S is wound around the winder 8, and the result of the winding determination is " ○”.

また、比較例３は、仕上圧延後の鋼材Ｓの板厚が３０ｍｍ、板幅が２０００ｍｍ、単重３２ｔｏｎ、長さが６８．０ｍであり、ランナウトテーブル５に鋼材Ｓの先端部Ｓａが８０ｍｐｍの仕上圧延速度で進入を開始した後に、鋼材Ｓの搬送速度を２０ｍｐｍの減速時速度にまで減速させて、当該減速時速度で鋼材Ｓを搬送し、その後、鋼材Ｓの先端部Ｓａがランナウトテーブル５を抜けたときに８０ｍｐｍの巻取時速度まで加速させ、鋼材Ｓを巻取時速度で巻き取らせる制御を行った。比較例３では、鋼材Ｓの単重が３２ｔｏｎの場合において、板厚が３０ｍｍと厚く板幅が２０００ｍｍと大きいため仕上圧延後の鋼材Ｓの長さＬｓ（６８．０ｍ）がランナウトテーブル５の長さＬｅ（１４０ｍ）よりも短くなっている。比較例３では、ランナウトテーブル５において、鋼材Ｓの搬送速度を２０ｍｐｍの減速時速度にまで減速させて、当該減速時速度で鋼材Ｓを搬送させたため、実績ＣＴが５４０℃で目標ＣＴ５５０℃よりも低く、ＣＴ判定の結果は「○」となった。一方、鋼材Ｓの先端部Ｓａが巻取機８に到達する前にその搬送速度を８０ｍｐｍの巻取時速度まで加速したが、その巻取時速度が遅いため、鋼材Ｓは巻取機８に巻付かず、巻取判定の結果は「×」となった。 In addition, in Comparative Example 3, the plate thickness of the steel material S after finish rolling is 30 mm, the plate width is 2000 mm, the unit weight is 32 tons, and the length is 68.0 m. After starting the approach at the finish rolling speed, the conveyance speed of the steel material S is reduced to a deceleration speed of 20 mpm, and the steel material S is conveyed at the deceleration speed. When the steel material S passed through the coil, it was accelerated to a winding speed of 80 mpm, and the steel material S was controlled to be wound at the winding speed. In Comparative Example 3, when the unit weight of the steel material S is 32 tons, the plate thickness is as thick as 30 mm and the plate width is as large as 2000 mm, so the length Ls (68.0 m) of the steel material S after finish rolling is the length of the runout table 5. It is shorter than Le (140m). In Comparative Example 3, in the runout table 5, the conveyance speed of the steel material S was reduced to a deceleration speed of 20 mpm, and the steel material S was conveyed at the deceleration speed, so that the actual CT was 540°C, which was lower than the target CT of 550°C. The result of CT judgment was "○". On the other hand, before the leading end Sa of the steel material S reaches the winder 8, the conveyance speed was accelerated to a winding speed of 80 mpm, but since the winding speed was slow, the steel material S was transferred to the winder 8. There was no winding, and the result of the winding judgment was "x".

また、比較例４は、仕上圧延後の鋼材Ｓの板厚が１９ｍｍ、板幅が２０００ｍｍ、単重３２ｔｏｎ、長さが１０７．４ｍであり、ランナウトテーブル５に鋼材Ｓの先端部Ｓａが８０ｍｐｍの仕上圧延速度で進入を開始した後に、鋼材Ｓの搬送速度を２０ｍｐｍの減速時速度にまで減速させて、当該減速時速度で鋼材Ｓを搬送し、その後、鋼材Ｓの先端部Ｓａがランナウトテーブル５を抜けたときに４２０ｍｐｍの巻取時速度まで加速させ、鋼材Ｓを巻取時速度で巻き取らせる制御を行った。比較例４では、鋼材Ｓの単重が３２ｔｏｎの場合において、板厚が１９ｍｍと厚く板幅が２０００ｍｍと大きいため仕上圧延後の鋼材Ｓの長さＬｓ（１０７．４ｍ）がランナウトテーブル５の長さＬｅ（１４０ｍ）よりも短くなっている。比較例４では、ランナウトテーブル５において、鋼材Ｓの搬送速度を２０ｍｐｍの減速時速度にまで減速させて、当該減速時速度で鋼材Ｓを搬送させたため、実績ＣＴが５４８℃で目標ＣＴ５５０℃よりも低く、ＣＴ判定の結果は「○」となった。一方、鋼材Ｓの先端部Ｓａが巻取機８に到達する前にその搬送速度を４２０ｍｐｍの巻取時速度まで加速したが、鋼材Ｓの先端部Ｓａをピンチロール６で抑えることができずに、マンドレル７に鋼材Ｓの先端部Ｓａが進入せずにトラブルとなり、巻取判定の結果は「×」となった。 In addition, in Comparative Example 4, the plate thickness of the steel material S after finish rolling is 19 mm, the plate width is 2000 mm, the unit weight is 32 tons, and the length is 107.4 m. After starting the approach at the finish rolling speed, the conveyance speed of the steel material S is reduced to a deceleration speed of 20 mpm, and the steel material S is conveyed at the deceleration speed. When the steel material S passed through the coil, it was accelerated to a winding speed of 420 mpm, and the steel material S was controlled to be wound at the winding speed. In Comparative Example 4, when the unit weight of the steel material S is 32 tons, the plate thickness is as thick as 19 mm and the plate width is as large as 2000 mm, so the length Ls (107.4 m) of the steel material S after finish rolling is equal to the length of the runout table 5. It is shorter than Le (140m). In Comparative Example 4, in the runout table 5, the conveyance speed of the steel material S was reduced to a deceleration speed of 20 mpm, and the steel material S was conveyed at the deceleration speed, so that the actual CT was 548°C, which was lower than the target CT of 550°C. The result of CT judgment was "○". On the other hand, before the tip Sa of the steel material S reached the winder 8, the conveyance speed was accelerated to the winding speed of 420 mpm, but the tip Sa of the steel material S could not be suppressed by the pinch roll 6. , a trouble occurred because the tip Sa of the steel material S did not enter the mandrel 7, and the result of the winding determination was "x".

また、実施例１は、仕上圧延後の鋼材Ｓの板厚が１９ｍｍ、板幅が２０００ｍｍ、単重３２ｔｏｎ、長さが１０７．４ｍであり、ランナウトテーブル５に鋼材Ｓの先端部Ｓａが８０ｍｐｍの仕上圧延速度で進入を開始した後に、鋼材Ｓの搬送速度を４０ｍｐｍの減速時速度にまで減速させて、当該減速時速度で鋼材Ｓを搬送し、その後、鋼材Ｓの先端部Ｓａがランナウトテーブル５を抜けたときに１５０ｍｐｍの巻取時速度まで加速させ、鋼材Ｓを巻取時速度で巻き取らせる制御を行った。実施例１では、鋼材Ｓの単重が３２ｔｏｎの場合において、板厚が１９ｍｍと厚く板幅が２０００ｍｍと大きいため仕上圧延後の鋼材Ｓの長さＬｓ（１０７．４ｍ）がランナウトテーブル５の長さＬｅ（１４０ｍ）よりも短くなっている。実施例１では、ランナウトテーブル５において、鋼材Ｓの搬送速度を４０ｍｐｍの減速時速度にまで減速させて、当該減速時速度で鋼材Ｓを搬送させたため、実績ＣＴが５２１℃で目標ＣＴ５５０℃よりも低く、ＣＴ判定の結果は「○」となった。また、鋼材Ｓの先端部Ｓａが巻取機８に到達する前にその搬送速度を１５０ｍｐｍの巻取時速度まで加速したので、鋼材Ｓは巻取機８に巻付き、巻取判定の結果は「○」となった。 In addition, in Example 1, the plate thickness of the steel material S after finish rolling is 19 mm, the plate width is 2000 mm, the unit weight is 32 tons, and the length is 107.4 m, and the tip portion Sa of the steel material S is placed on the runout table 5 at a speed of 80 mpm. After starting the approach at the finish rolling speed, the conveyance speed of the steel material S is reduced to a deceleration speed of 40 mpm, and the steel material S is conveyed at the deceleration speed, and then the tip portion Sa of the steel material S is transferred to the runout table 5. When the steel material S passed through the coil, it was accelerated to a winding speed of 150 mpm, and the steel material S was controlled to be wound at the winding speed. In Example 1, when the unit weight of the steel material S is 32 tons, the plate thickness is as thick as 19 mm and the plate width is as large as 2000 mm, so the length Ls (107.4 m) of the steel material S after finish rolling is the length of the runout table 5. It is shorter than Le (140m). In Example 1, in the runout table 5, the conveyance speed of the steel material S was reduced to a deceleration speed of 40 mpm, and the steel material S was conveyed at the deceleration speed, so that the actual CT was 521°C, which was lower than the target CT of 550°C. The result of CT judgment was "○". In addition, before the tip Sa of the steel material S reached the winder 8, the conveyance speed was accelerated to the winding speed of 150 mpm, so the steel material S was wound around the winder 8, and the result of the winding determination was It became "○".

また、実施例２は、仕上圧延後の鋼材Ｓの板厚が２５ｍｍ、板幅が２０００ｍｍ、単重３２ｔｏｎ、長さが８１．６ｍであり、ランナウトテーブル５に鋼材Ｓの先端部Ｓａが８０ｍｐｍの仕上圧延速度で進入を開始した後に、鋼材Ｓの搬送速度を６０ｍｐｍの減速時速度にまで減速させて、当該減速時速度で鋼材Ｓを搬送し、その後、鋼材Ｓの先端部Ｓａがランナウトテーブル５を抜けたときに１５０ｍｐｍの巻取時速度まで加速させ、鋼材Ｓを巻取時速度で巻き取らせる制御を行った。実施例２では、鋼材Ｓの単重が３２ｔｏｎの場合において、板厚が２５ｍｍと厚く板幅が２０００ｍｍと大きいため仕上圧延後の鋼材Ｓの長さＬｓ（８１．６ｍ）がランナウトテーブル５の長さＬｅ（１４０ｍ）よりも短くなっている。実施例２では、ランナウトテーブル５において、鋼材Ｓの搬送速度を４０ｍｐｍの減速時速度にまで減速させて、当該減速時速度で鋼材Ｓを搬送させたため、実績ＣＴが５３８℃で目標ＣＴ５５０℃よりも低く、ＣＴ判定の結果は「○」となった。また、鋼材Ｓの先端部Ｓａが巻取機８に到達する前にその搬送速度を１５０ｍｐｍの巻取時速度まで加速したので、鋼材Ｓは巻取機８に巻付き、巻取判定の結果は「○」となった。 In addition, in Example 2, the plate thickness of the steel material S after finish rolling is 25 mm, the plate width is 2000 mm, the unit weight is 32 tons, and the length is 81.6 m. After starting the approach at the finish rolling speed, the conveyance speed of the steel material S is reduced to a deceleration speed of 60 mpm, and the steel material S is conveyed at the deceleration speed. When the steel material S passed through the coil, it was accelerated to a winding speed of 150 mpm, and the steel material S was controlled to be wound at the winding speed. In Example 2, when the unit weight of the steel material S is 32 tons, the plate thickness is as thick as 25 mm and the plate width is as large as 2000 mm, so the length Ls (81.6 m) of the steel material S after finish rolling is the length of the runout table 5. It is shorter than Le (140m). In Example 2, in the runout table 5, the conveyance speed of the steel material S was reduced to a deceleration speed of 40 mpm, and the steel material S was conveyed at the deceleration speed, so that the actual CT was 538°C, which was lower than the target CT of 550°C. The result of CT judgment was "○". In addition, before the tip Sa of the steel material S reached the winder 8, the conveyance speed was accelerated to the winding speed of 150 mpm, so the steel material S was wound around the winder 8, and the result of the winding determination was It became "○".

また、実施例３は、仕上圧延後の鋼材Ｓの板厚が３０ｍｍ、板幅が２０００ｍｍ、単重３２ｔｏｎ、長さが６８．０ｍであり、ランナウトテーブル５に鋼材Ｓの先端部Ｓａが８０ｍｐｍの仕上圧延速度で進入を開始した後に、鋼材Ｓの搬送速度を４０ｍｐｍの減速時速度にまで減速させて、当該減速時速度で鋼材Ｓを搬送し、その後、鋼材Ｓの先端部Ｓａがランナウトテーブル５を抜けたときに１５０ｍｐｍの巻取時速度まで加速させ、鋼材Ｓを巻取時速度で巻き取らせる制御を行った。実施例３では、鋼材Ｓの単重が３２ｔｏｎの場合において、板厚が３０ｍｍと厚く板幅が２０００ｍｍと大きいため仕上圧延後の鋼材Ｓの長さＬｓ（６８．０ｍ）がランナウトテーブル５の長さＬｅ（１４０ｍ）よりも短くなっている。実施例３では、ランナウトテーブル５において、鋼材Ｓの搬送速度を４０ｍｐｍの減速時速度にまで減速させて、当該減速時速度で鋼材Ｓを搬送させたため、実績ＣＴが５４１℃で目標ＣＴ５５０℃よりも低く、ＣＴ判定の結果は「○」となった。また、鋼材Ｓの先端部Ｓａが巻取機８に到達する前にその搬送速度を１５０ｍｐｍの巻取時速度まで加速したので、鋼材Ｓは巻取機８に巻付き、巻取判定の結果は「○」となった。 In addition, in Example 3, the plate thickness of the steel material S after finish rolling is 30 mm, the plate width is 2000 mm, the unit weight is 32 tons, and the length is 68.0 m, and the tip portion Sa of the steel material S is placed on the runout table 5 at 80 mpm. After starting the approach at the finish rolling speed, the conveyance speed of the steel material S is reduced to a deceleration speed of 40 mpm, and the steel material S is conveyed at the deceleration speed, and then the tip portion Sa of the steel material S is transferred to the runout table 5. When the steel material S passed through the coil, it was accelerated to a winding speed of 150 mpm, and the steel material S was controlled to be wound at the winding speed. In Example 3, when the unit weight of the steel material S is 32 tons, the plate thickness is as thick as 30 mm and the plate width is as large as 2000 mm, so the length Ls (68.0 m) of the steel material S after finish rolling is the length of the runout table 5. It is shorter than Le (140m). In Example 3, in the runout table 5, the conveyance speed of the steel material S was reduced to a deceleration speed of 40 mpm, and the steel material S was conveyed at the deceleration speed, so that the actual CT was 541°C, which was lower than the target CT of 550°C. The result of CT judgment was "○". In addition, before the tip Sa of the steel material S reached the winder 8, the conveyance speed was accelerated to the winding speed of 150 mpm, so the steel material S was wound around the winder 8, and the result of the winding determination was It became "○".

また、実施例４は、仕上圧延後の鋼材Ｓの板厚が１９ｍｍ、板幅が２０００ｍｍ、単重３２ｔｏｎ、長さが１０７．４ｍであり、ランナウトテーブル５に鋼材Ｓの先端部Ｓａが８０ｍｐｍの仕上圧延速度で進入を開始した後に、鋼材Ｓの搬送速度を２０ｍｐｍの減速時速度にまで減速させて、当該減速時速度で鋼材Ｓを搬送し、その後、鋼材Ｓの先端部Ｓａがランナウトテーブル５を抜けたときに４００ｍｐｍの巻取時速度まで加速させ、鋼材Ｓを巻取時速度で巻き取らせる制御を行った。実施例４では、鋼材Ｓの単重が３２ｔｏｎの場合において、板厚が１９ｍｍと厚く板幅が２０００ｍｍと大きいため仕上圧延後の鋼材Ｓの長さＬｓ（１０７．４ｍ）がランナウトテーブル５の長さＬｅ（１４０ｍ）よりも短くなっている。実施例４では、ランナウトテーブル５において、鋼材Ｓの搬送速度を２０ｍｐｍの減速時速度にまで減速させて、当該減速時速度で鋼材Ｓを搬送させたため、実績ＣＴが５４３℃で目標ＣＴ５５０℃よりも低く、ＣＴ判定の結果は「○」となった。また、鋼材Ｓの先端部Ｓａが巻取機８に到達する前にその搬送速度を４００ｍｐｍの巻取時速度まで加速したので、鋼材Ｓは巻取機８に巻付き、巻取判定の結果は「○」となった。 In addition, in Example 4, the plate thickness of the steel material S after finish rolling is 19 mm, the plate width is 2000 mm, the unit weight is 32 tons, and the length is 107.4 m. After starting the approach at the finish rolling speed, the conveyance speed of the steel material S is reduced to a deceleration speed of 20 mpm, and the steel material S is conveyed at the deceleration speed. When the steel material S passed through the coil, it was accelerated to a winding speed of 400 mpm, and the steel material S was controlled to be wound at the winding speed. In Example 4, when the unit weight of the steel material S is 32 tons, the plate thickness is as thick as 19 mm and the plate width is as large as 2000 mm, so the length Ls (107.4 m) of the steel material S after finish rolling is the length of the runout table 5. It is shorter than Le (140m). In Example 4, in the runout table 5, the conveyance speed of the steel material S was reduced to a deceleration speed of 20 mpm, and the steel material S was conveyed at the deceleration speed, so that the actual CT was 543°C, which was lower than the target CT of 550°C. The result of CT judgment was "○". In addition, before the tip Sa of the steel material S reached the winder 8, the conveyance speed was accelerated to the winding speed of 400 mpm, so the steel material S was wound around the winder 8, and the result of the winding determination was It became "○".

このように、実施例１～４から、仕上圧延された後の鋼材Ｓの長さＬｓがランナウトテーブル５の長さＬｅよりも短くなる場合に、ランナウトテーブル５に鋼材Ｓの先端部が仕上圧延速度で進入を開始した後に、鋼材Ｓの搬送速度を８０ｍｐｍ未満の減速時速度にまで減速させて、当該減速時速度で鋼材Ｓを搬送し、その後に、鋼材Ｓの先端部Ｓａが巻取機８に巻取り開始されるまでの間に、鋼材Ｓの搬送速度を１５０ｍｐｍから４００ｍｐｍまでの間の巻取時速度にまで加速させる。これにより、仕上圧延後の長さＬｓがランナウトテーブル５の長さＬｅよりも短くなる鋼材Ｓの巻取温度の目標巻取温度の達成と当該鋼材Ｓの巻取機８での適切な巻付きの両立が可能となることがわかった。 In this way, from Examples 1 to 4, when the length Ls of the steel material S after finish rolling is shorter than the length Le of the runout table 5, the tip of the steel material S is placed on the runout table 5 after finish rolling. After starting the approach at the same speed, the conveyance speed of the steel material S is reduced to a deceleration speed of less than 80 mpm, and the steel material S is conveyed at the deceleration speed, and then the tip portion Sa of the steel material S is transferred to the winding machine. 8, the conveying speed of the steel material S is accelerated to a winding speed of 150 mpm to 400 mpm. As a result, the length Ls after finish rolling is shorter than the length Le of the runout table 5, and the target winding temperature of the steel material S is achieved, and the steel material S is appropriately wound in the winder 8. It was found that it is possible to achieve both.

なお、実施例１～４のいずれの場合にあっても、仕上圧延後の鋼材Ｓの板厚が１９ｍｍ以上となっているが、本発明はこれに限定されずに、仕上圧延後の鋼材Ｓの板厚が１９ｍｍよりも薄い場合であっても、（１）式及び（２）により仕上圧延された後の鋼材Ｓの長さＬｓがランナウトテーブル５の長さＬｅよりも短くなると判断されるとき、本発明を適用することができる。つまり、仕上圧延後の鋼材Ｓの板厚が１９ｍｍよりも薄い場合であっても、（１）式及び（２）により仕上圧延された後の鋼材Ｓの長さＬｓがランナウトテーブル５の長さＬｅよりも短くなると判断されるとき、ランナウトテーブル５に鋼材の先端部Ｓａが仕上圧延速度で進入を開始した後に、鋼材Ｓの搬送速度を８０ｍｐｍ未満の減速時速度にまで減速させて、当該減速時速度で鋼材Ｓを搬送し、その後に、鋼材Ｓの先端部Ｓａが巻取機８に巻取り開始されるまでの間に、鋼材Ｓの搬送速度を１５０ｍｐｍから４００ｍｐｍまでの間の巻取時速度にまで加速させるよう制御すればよい。 In any of Examples 1 to 4, the thickness of the steel material S after finish rolling is 19 mm or more, but the present invention is not limited to this, and the steel material S after finish rolling Even if the plate thickness is thinner than 19 mm, it is determined that the length Ls of the steel material S after finish rolling is shorter than the length Le of the runout table 5 according to equations (1) and (2). The present invention can be applied when In other words, even if the thickness of the steel material S after finish rolling is thinner than 19 mm, the length Ls of the steel material S after finish rolling is the length of the runout table 5 according to equations (1) and (2). When it is determined that the steel material will be shorter than Le, the leading end Sa of the steel material starts to enter the runout table 5 at the finish rolling speed, and then the conveying speed of the steel material S is reduced to a deceleration speed of less than 80 mpm, and the deceleration is performed. During winding, the conveying speed of the steel material S is set between 150 mpm and 400 mpm. It is only necessary to control the speed so that it accelerates to a certain speed.

１ 熱間圧延ライン
２ 加熱炉
３ 粗圧延機
４ 仕上圧延機
５ ランナウトテーブル
６ ピンチロール
７ マンドレル
８ 巻取機
９ 出側板速度検出器
１０ 出側板温度計
１１ 出側板厚計
１２ 出側板幅計
１３ 巻取温度計
１４ 冷却制御部
１５ 上位計算機
５１ 搬送ロール
Ｓ 鋼材
Ｓａ 先端部
Ｓｂ 尾端部 1 Hot rolling line 2 Heating furnace 3 Roughing mill 4 Finishing rolling mill 5 Runout table 6 Pinch roll 7 Mandrel 8 Winder 9 Output plate speed detector 10 Outlet plate thermometer 11 Outlet plate thickness gauge 12 Outlet plate width gauge 13 Winding thermometer 14 Cooling control unit 15 Host computer 51 Conveyance roll S Steel material Sa Tip part Sb Tail end part

Claims (2)

鋼材を仕上圧延機で仕上圧延する仕上圧延工程と、該仕上圧延工程で仕上圧延された鋼材を、前記仕上圧延機の下流側に設けられたランナウトテーブルで冷却する冷却工程と、該冷却工程で冷却された鋼材を巻取機で巻取る巻取工程とを含み、下記（１）式で定義される仕上圧延された後の前記鋼材の長さＬｓが前記ランナウトテーブルの長さＬｅよりも短くなる熱延鋼帯の製造方法であって、
前記ランナウトテーブルに前記鋼材の先端部が仕上圧延速度で進入を開始した後に、前記鋼材の搬送速度を８０ｍｐｍ未満の減速時速度にまで減速させて、当該減速時速度で前記鋼材を搬送し、その後に、前記鋼材の先端部が前記巻取機に巻取り開始されるまでの間に、前記鋼材の搬送速度を１５０ｍｐｍから４００ｍｐｍまでの間の巻取時速度にまで加速させるよう制御することを特徴とする熱延鋼帯の製造方法。
Ｌｓ＝Ｍ／（ρＴＷ） ・・・（１）
ここで、Ｍは鋼材Ｓの重量、ρは鋼材Ｓの密度、Ｔは仕上圧延後の鋼材Ｓの板厚、Ｗは仕上圧延後の鋼材Ｓの板幅である。 A finishing rolling process in which the steel material is finish-rolled in a finishing rolling mill; a cooling process in which the steel material finish-rolled in the finishing rolling process is cooled on a runout table provided downstream of the finishing rolling mill; a winding step of winding the cooled steel material with a winder, and the length Ls of the steel material after finish rolling defined by the following formula (1) is shorter than the length Le of the runout table. A method for producing a hot rolled steel strip, comprising:
After the tip of the steel material starts to enter the runout table at a finish rolling speed, the conveyance speed of the steel material is reduced to a deceleration speed of less than 80 mpm, and the steel material is conveyed at the deceleration speed, and then Preferably, the conveying speed of the steel material is controlled to be accelerated to a winding speed between 150 mpm and 400 mpm until the tip of the steel material starts being wound up by the winding machine. A method for producing hot rolled steel strip.
Ls=M/(ρTW)...(1)
Here, M is the weight of the steel material S, ρ is the density of the steel material S, T is the plate thickness of the steel material S after finish rolling, and W is the plate width of the steel material S after finish rolling. 鋼材を仕上圧延する仕上圧延機と、該仕上圧延機の下流側に設けられ、前記仕上圧延機で仕上圧延された鋼材を冷却するランナウトテーブルと、該ランナウトテーブルで冷却された鋼材を巻取る巻取機とを備え、下記（１）式で定義される仕上圧延された後の前記鋼材の長さＬｓが前記ランナウトテーブルの長さＬｅよりも短くなる熱延鋼帯の製造装置であって、
前記ランナウトテーブルに前記鋼材の先端部が仕上圧延速度で進入を開始した後に、前記鋼材の搬送速度を８０ｍｐｍ未満の減速時速度にまで減速させて、当該減速時速度で前記鋼材を搬送し、その後に、前記鋼材の先端部が前記巻取機に巻取り開始されるまでの間に、前記鋼材の搬送速度を１５０ｍｐｍから４００ｍｐｍまでの間の巻取時速度にまで加速させるよう制御する冷却制御部を備えていることを特徴とする熱延鋼帯の製造装置。
Ｌｓ＝Ｍ／（ρＴＷ） ・・・（１）
ここで、Ｍは鋼材Ｓの重量、ρは鋼材Ｓの密度、Ｔは仕上圧延後の鋼材Ｓの板厚、Ｗは仕上圧延後の鋼材Ｓの板幅である。 A finishing mill for finishing rolling a steel material; a runout table provided downstream of the finishing rolling mill for cooling the steel material finish-rolled by the finishing rolling mill; and a winder for winding up the steel material cooled by the runout table. An apparatus for producing a hot rolled steel strip, comprising: a milling machine, in which the length Ls of the steel material after finish rolling defined by the following formula (1) is shorter than the length Le of the runout table,
After the tip of the steel material starts to enter the runout table at a finish rolling speed, the conveyance speed of the steel material is reduced to a deceleration speed of less than 80 mpm, and the steel material is conveyed at the deceleration speed, and then and a cooling control unit that controls the conveying speed of the steel material to be accelerated to a winding speed between 150 mpm and 400 mpm until the tip of the steel material starts being wound up by the winding machine. A hot-rolled steel strip manufacturing device characterized by comprising:
Ls=M/(ρTW)...(1)
Here, M is the weight of the steel material S, ρ is the density of the steel material S, T is the plate thickness of the steel material S after finish rolling, and W is the plate width of the steel material S after finish rolling.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000063956A (en) 1998-08-12 2000-02-29 Nkk Corp Production of thick dual-phase hot rolled band steel
JP2010162595A (en) 2009-01-19 2010-07-29 Jfe Steel Corp Equipment and method for coiling thick high-strength hot-rolled steel sheet
JP2012035310A (en) 2010-08-10 2012-02-23 Jfe Steel Corp Method and equipment for manufacturing hot rolled steel plates
JP2012170959A (en) 2011-02-18 2012-09-10 Jfe Steel Corp Method of manufacturing hot-rolled steel plate
JP2018069278A (en) 2016-10-28 2018-05-10 Ｊｆｅスチール株式会社 Production method of thick-walled high strength hot-rolled steel plate

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000063956A (en) 1998-08-12 2000-02-29 Nkk Corp Production of thick dual-phase hot rolled band steel
JP2010162595A (en) 2009-01-19 2010-07-29 Jfe Steel Corp Equipment and method for coiling thick high-strength hot-rolled steel sheet
JP2012035310A (en) 2010-08-10 2012-02-23 Jfe Steel Corp Method and equipment for manufacturing hot rolled steel plates
JP2012170959A (en) 2011-02-18 2012-09-10 Jfe Steel Corp Method of manufacturing hot-rolled steel plate
JP2018069278A (en) 2016-10-28 2018-05-10 Ｊｆｅスチール株式会社 Production method of thick-walled high strength hot-rolled steel plate

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