JP2009195925A - Hot rolling method, hot-rolled metal band and electric resistance welded tube - Google Patents

Hot rolling method, hot-rolled metal band and electric resistance welded tube Download PDF

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JP2009195925A
JP2009195925A JP2008038119A JP2008038119A JP2009195925A JP 2009195925 A JP2009195925 A JP 2009195925A JP 2008038119 A JP2008038119 A JP 2008038119A JP 2008038119 A JP2008038119 A JP 2008038119A JP 2009195925 A JP2009195925 A JP 2009195925A
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rolled
rolling
hot
rolling mill
mill
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Yoshinori Iwasaki
嘉徳 岩崎
Shunji Tanaka
俊次 田中
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Jfe Steel Corp
Jfeスチール株式会社
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<P>PROBLEM TO BE SOLVED: To reduce scrapped parts accompanying cutting or the like as small as possible and to improve the yield when manufacturing a hot-rolled metal band in a hot rolling line. <P>SOLUTION: Flying thickness change is performed during rolling a material to be rolled with a finishing mill on the hot rolling line so that the cutting predetermined parts of the material to be rolled are locally thinner as compared with the parts other than the cutting predetermined part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、熱間圧延方法および熱延金属帯ならびに電縫管に関し、特に、切除予定部分を局部的に薄く圧延する熱間圧延方法およびそれにより製造された熱延金属帯ならびにそれを用いて製造された電縫管に関する。 TECHNICAL FIELD The present invention relates to a hot rolling method, a hot-rolled metal strip, and an electric-welded pipe, and more particularly, a hot-rolling method for locally rolling a portion to be cut thinly, a hot-rolled metal strip produced by the method, and using the hot-rolled metal strip It relates to the manufactured electric resistance tube.
熱間圧延とは、一般的に、連続鋳造または造塊、分塊によって製造されたスラブ状の金属材料を、加熱炉にて数百〜千数百℃に加熱した後、熱間圧延ライン上に抽出し、一対または複数対のロールで挟圧しつつそのロールを回転させることで、薄く延ばし、コイル状に巻き取るプロセスをいう。 The hot rolling is generally performed by heating a slab-like metal material produced by continuous casting, ingot-making, or ingoting to several hundred to several hundreds of degrees Celsius in a heating furnace, and then on the hot rolling line. This is a process in which the roll is rotated while being pinched by a pair or a plurality of pairs of rolls, and is rolled thinly and wound into a coil shape.
図3は、従来から一般的に用いられている、帯鋼の熱間圧延ライン100の一例を示す。加熱炉10により数百〜千数百℃に加熱された厚み140〜300mmの金属材料(以下、被圧延材。仕上圧延後は熱延金属帯ともいう。)8は、粗圧延機12、仕上圧延機18により厚み0.8〜25mmまで圧延されて金属帯状に薄く延ばされる。そして、冷却関連設備26にて所望の温度まで水冷された後、コイラー24にて巻き取られる。   FIG. 3 shows an example of a hot rolling line 100 for strip steel that has been generally used. A metal material 140 to 300 mm thick (hereinafter referred to as a material to be rolled. After finish rolling is also referred to as a hot-rolled metal strip) 8 heated to several hundred to several hundreds of degrees Celsius by the heating furnace 10 is a rough rolling machine 12 and finish. It is rolled to a thickness of 0.8 to 25 mm by a rolling mill 18 and thinly extended into a metal strip shape. Then, the water is cooled to a desired temperature by the cooling-related equipment 26 and then wound by the coiler 24.
粗圧延機12は、図3に示す熱間圧延ライン100の場合、R2、R4の2基であるが、必ずしも基数はこれに限らない(図4で、R2、R4と、番号が飛んでいるのは、将来、生産増の場合に、空きスペースにR1やR3を増設する予定だからにすぎない)。   In the case of the hot rolling line 100 shown in FIG. 3, the rough rolling mill 12 has two groups of R2 and R4, but the number is not necessarily limited to this (in FIG. 4, the numbers R2, R4 are skipped). (This is just because R1 and R3 are planned to be added to the empty space in the future when production increases).
これら基数の違いはあるが、粗圧延機12は、往復圧延あるいは一方向圧延あるいは両者により、一般的に、合計で6回あるいは7回(6パスあるいは7パスのように呼称することもある)の粗圧延を行なって、粗圧延後の被圧延材8を、それにつづく仕上圧延機18に向け供給する。   Although there is a difference in these radixes, the roughing mill 12 is generally 6 times or 7 times in total by reciprocating rolling or unidirectional rolling or both (sometimes referred to as 6 passes or 7 passes). The raw material 8 after the rough rolling is supplied to the finishing mill 18 following the rough rolling.
図3中には図示していないが、粗圧延機12のすぐ上流に幅プレスを設置したものもある。   Although not shown in FIG. 3, there is also one in which a width press is installed immediately upstream of the roughing mill 12.
仕上圧延機18は、数百〜千数百℃の高温の被圧延材8を複数の圧延機で同時に圧延するタンデム圧延機の形式をとるが、仕上タンデム圧延機ではなく、略して単に「仕上圧延機」と称されることが多い。19はワークロール、20はルーパである。   The finishing mill 18 takes the form of a tandem rolling mill that simultaneously rolls a high-temperature workpiece 8 of several hundred to several hundreds of degrees Celsius with a plurality of rolling mills, but is not a finishing tandem rolling mill and is simply “finishing”. Often referred to as a “rolling mill”. 19 is a work roll and 20 is a looper.
仕上圧延機18を構成する各圧延機(スタンド)の数は、図3に示す熱間圧延ライン100の場合、F1〜F7の7基であるが、6基のものもある。   In the case of the hot rolling line 100 shown in FIG. 3, the number of rolling mills (stands) constituting the finish rolling mill 18 is seven of F1 to F7, but there are six.
このほか、熱間圧延ライン100には、仕上圧延機18を構成する各圧延機間を除いて、その他の圧延機の間には、図示しない多数(百以上)のテーブルロールが設置されており、被圧延材8を搬送する。   In addition, in the hot rolling line 100, many (one hundred or more) table rolls (not shown) are installed between the other rolling mills except for each rolling mill constituting the finish rolling mill 18. The to-be-rolled material 8 is conveyed.
また、被圧延材8には、加熱炉10から抽出されたとき、その表裏面に酸化物の層(以下、スケール)が生成しており、圧延され薄く延ばされるとともに放熱により降温していく過程でも、被圧延材8は高温の状態で大気に曝され、新たなスケールが被圧延材8の表裏面に生成するため、粗圧延機12を構成する各圧延機の入側には、ポンプからの供給圧にして10〜30MPa内外の高圧水を被圧延材8の表裏面に吹き付けてスケールを除去するデスケーリング装置16が設置され、スケールを除去している。   In addition, when the material 8 is extracted from the heating furnace 10, oxide layers (hereinafter referred to as scales) are formed on the front and back surfaces thereof, rolled and thinned, and the temperature is lowered by heat radiation. However, since the material 8 to be rolled is exposed to the atmosphere at a high temperature and new scales are generated on the front and back surfaces of the material 8 to be rolled, a pump is provided on the entry side of each rolling mill constituting the roughing mill 12. A descaling device 16 is installed to remove scale by spraying high and low pressure water of 10 to 30 MPa on the front and back surfaces of the material 8 to be rolled to a supply pressure of 10 to 30 MPa.
14はクロップシャーであり、仕上圧延前に被圧延材8の先尾端のクロップ(被圧延材8の先尾端の、いびつな形状の部分)を切断除去し、仕上圧延機18にスムーズに噛み込みやすい略矩形の平面形状に整形する。   Reference numeral 14 denotes a crop shear, which cuts and removes the crop at the leading end of the material 8 to be rolled (finished portion of the leading end of the material 8 to be distorted) before finish rolling, and smoothly finishes it on the finishing mill 18. Shape into a substantially rectangular planar shape that is easy to bite.
仕上圧延された被圧延材8は冷却関連設備26から供給される冷却水により冷却された後、コイラー24にて巻き取られ、熱延金属帯となる。   The finish-rolled material 8 is cooled by cooling water supplied from the cooling-related equipment 26 and then wound up by the coiler 24 to form a hot-rolled metal strip.
50は制御装置、70はプロセスコンピュータ、90はビジネスコンピュータである。   50 is a control device, 70 is a process computer, and 90 is a business computer.
さて、熱間圧延ラインで製造される、熱延金属帯には、そのまま出荷されるもののほか、さらに冷間圧延されたり管に加工されたりするものなどがある。   Now, hot-rolled metal strips manufactured in a hot rolling line include those that are shipped as they are and those that are further cold-rolled or processed into tubes.
また、熱間圧延ラインで製造される、管や冷間圧延用の素材である熱延金属帯(薄板)のほか、別のラインで製造される、厚板、形鋼なども含め、一般的に、上流工程としては精錬から、下流工程としては表面処理に至る、金属製品の各製造工程(表面処理などは製造品目の種別によりないものもあるが)では、可能な限り切除したりすることに伴う屑化部分が少ないこと、すなわち、可能な限り歩留まりが高いことが望まれる。   In addition to hot rolled metal strip (thin plate), which is a material for pipes and cold rolling, manufactured in a hot rolling line, it is also common to include thick plates and steel shapes manufactured in another line. In addition, in each metal product manufacturing process (from surface processing, etc., depending on the type of manufacturing item), from refining as the upstream process to surface treatment as the downstream process, cut as much as possible. It is desired that there are few debris parts, that is, the yield is as high as possible.
ここで、話は変わるが、熱間圧延では、仕上圧延中に各圧延機での上下ワークロール19の間隙を徐々に変更することで、被圧延材8の仕上圧延後の板厚を徐々に変更する、走間板厚変更と呼ばれる技術が、例えば、特許文献1などの方法により、実用化されている。
特開昭58−122111号公報
Here, the story changes, but in hot rolling, by gradually changing the gap between the upper and lower work rolls 19 in each rolling mill during finish rolling, the thickness of the rolled material 8 after finish rolling is gradually increased. A technique called changing the running plate thickness, which has been changed, has been put into practical use, for example, by a method such as Patent Document 1.
JP 58-122111 A
ここで、歩留まりの方に話を戻すと、先述の通り、可能な限り歩留まりが高いことが望まれるところ、例えば、鋼の場合を例に挙げると、管の一種である電縫鋼管を、熱延鋼帯を素材として製造する際は、平坦度や温度履歴の非定常さに伴い材質も非定常で一定しない、先端部分と尾端部分、例えば、各5m内外は、管に加工後に切除して屑化し、客先に製品として納入しないようにすることで、品質保証する一方、切除して屑化することに伴う歩留まりロスについては、これを忍従せねばならないジレンマを抱えていた。 Here, when returning to the yield direction, as described above, it is desired that the yield is as high as possible.For example, in the case of steel, an ERW steel pipe, which is a kind of pipe, is heated. When manufacturing a steel strip as a raw material, the material is also unsteady and non-constant due to unsteadiness of the flatness and temperature history. The tip and tail ends, for example, the inside and outside of each 5 m are cut after being processed into a tube. While ensuring quality by preventing scrapping and not delivering it as a product to customers, there was a dilemma that had to be obeyed with respect to yield loss associated with scrapping and scrapping.
熱延鋼帯の先端部分と尾端部分に平坦度や温度履歴の非定常な部分ができるのは、まず、先端部分の場合でいえば、まだ被圧延材8の最先端がコイラー24に巻き付くまでの間は、仕上圧延機18の最終圧延機からコイラー24に至る被圧延材部分が非拘束となるため、図4に示すごとく、平坦度がよくない部分ができやすくなるとともに、これに伴い、冷却水wが水溜まり状になって、同被圧延材部分は、水溜まりができた部分で局部的に強く冷却されて温度履歴が急冷気味になるからである。   In the case of the tip portion, the leading edge and the tail end portion of the hot-rolled steel strip are unsteady in flatness and temperature history. In the meantime, since the material to be rolled from the final rolling mill of the finish rolling mill 18 to the coiler 24 becomes unconstrained, as shown in FIG. Accordingly, the cooling water w becomes a puddle shape, and the rolled material portion is strongly cooled locally at the portion where the puddle is formed, and the temperature history becomes rapidly cooled.
本発明は、従来技術のかような問題に鑑みてなされたものであり、熱間圧延ラインにおける熱延金属帯の製造に際し、可能な限り切除したりすることに伴う屑化部分が少なくなり、歩留まりが高くなる方法およびその方法により製造された熱延金属帯ならびにそれを用いて製造された電縫管を提供することを目的とする。   The present invention has been made in view of such problems as in the prior art, and in the production of a hot-rolled metal strip in a hot rolling line, as much as possible, there are fewer scraped portions due to cutting and yield. An object of the present invention is to provide a method of increasing the height of the steel sheet, a hot-rolled metal strip manufactured by the method, and an electric-welded tube manufactured using the hot-rolled metal strip.
すなわち、本発明は以下の通りである。
(1)被圧延材の切除予定部分が該切除予定部分以外に比べ局部的に薄くなるように、熱間圧延ラインにおける仕上圧延機にて前記被圧延材を圧延中に、走間板厚変更する
ことを特徴とする熱間圧延方法。
(2)被圧延材の先尾端の切除予定部分が該切除予定部分以外に比べ局部的に薄くなるように、熱間圧延ラインにおける仕上圧延機にて前記被圧延材を圧延中に、走間板厚変更する
ことを特徴とする電縫管用熱延金属帯の熱間圧延方法。
(3)熱延金属帯であって、該熱延金属帯の切除予定部分が該切除予定部分以外に比べ局部的に薄い
ことを特徴とする熱延金属帯。
(4)熱延金属帯であって、該熱延金属帯の先尾端の切除予定部分が該切除予定部分以外に比べ局部的に薄い
ことを特徴とする電縫管用の(3)の熱延金属帯。
(5)(4)の熱延金属帯を素材として製造した電縫管。
That is, the present invention is as follows.
(1) Change the running plate thickness during rolling of the material to be rolled by a finish rolling mill in a hot rolling line so that the portion to be cut of the material to be rolled is locally thinner than the portion other than the portion to be cut. A hot rolling method characterized by:
(2) During rolling of the material to be rolled by a finish rolling mill in a hot rolling line, the portion to be cut at the leading end of the material to be rolled is locally thinner than the portion to be cut. A hot rolling method for hot-rolled metal strips for electric resistance welded tubes, wherein the thickness of the steel sheet is changed.
(3) A hot-rolled metal strip, wherein a portion to be cut of the hot-rolled metal strip is locally thinner than a portion other than the portion to be cut.
(4) The heat of (3) for an electric resistance welded tube, wherein the portion of the hot-rolled metal strip to be excised at the leading end is locally thinner than the portion other than the portion to be excised Metal strip.
(5) An electric resistance welded tube manufactured from the hot-rolled metal strip of (4).
本発明によれば、熱間圧延ラインにおける熱延金属帯の製造に際し、可能な限り切除したりすることに伴う屑化部分が少なくなり、歩留まりが高くなる方法およびその方法により製造された熱延金属帯ならびにそれを用いて製造された電縫管を提供できる。 According to the present invention, in the production of a hot-rolled metal strip in a hot rolling line, a method for reducing the amount of scrapped parts associated with cutting as much as possible and increasing the yield, and a hot-rolled manufactured by the method. A metal strip and an electric resistance welded tube manufactured using the same can be provided.
図3に示した、熱間圧延ライン100にて熱延鋼帯を熱間圧延する場合を例にとって、以下、説明する。 The case where hot-rolled steel strip is hot-rolled in the hot-rolling line 100 shown in FIG. 3 will be described below as an example.
図3中に示した、粗圧延機12で粗圧延された被圧延材8が搬送されてきて、その先端が仕上入側温度計15の真下に到達すると、被圧延材8の先端の温度は仕上入側温度計15からプロセスコンピュータ70に伝送される。   When the material 8 to be rolled roughly rolled by the roughing mill 12 shown in FIG. 3 is transported and its tip reaches just below the finishing entry thermometer 15, the temperature of the tip of the material 8 is It is transmitted from the finishing input side thermometer 15 to the process computer 70.
プロセスコンピュータ70内では、被圧延材8の先端の温度がある一定の閾値以上、例えば、700℃以上であるか否かを判断し、被圧延材8の先端の温度がある一定の閾値以上の場合には、被圧延材8の先端が仕上入側温度計15の真下に到達したと判定する。   In the process computer 70, it is determined whether or not the temperature of the tip of the material 8 to be rolled is equal to or higher than a certain threshold, for example, 700 ° C. or higher. In this case, it is determined that the tip of the material to be rolled 8 has reached directly below the finishing entry thermometer 15.
そして、プロセスコンピュータ70内では、被圧延材8の先端が仕上入側温度計15の真下に到達した、と判定したことをトリガー信号として、プロセスコンピュータ70よりも上位のビジネスコンピュータ90から、目標とする被圧延材8の仕上圧延後板厚と仕上圧延機出側換算被圧延材速度を設定し、プロセスコンピュータ70では、それら仕上圧延後板厚と仕上圧延機出側換算被圧延材速度になるような熱間圧延ライン100における仕上圧延機18を構成する各圧延機の上下ワークロール19の間隙と回転速度を計算により求めて、実際にそれら求めた各圧延機の上下ワークロール19の間隙と回転速度になるよう、それら各圧延機の上下ワークロール19の間隙と回転速度を調整する図示しない各アクチュエータに指令する。   Then, in the process computer 70, a target signal is obtained from a business computer 90 higher than the process computer 70 with a trigger signal that it is determined that the tip of the material 8 to be rolled has reached directly below the finishing input thermometer 15. The sheet thickness after finish rolling of the material to be rolled 8 and the finished rolling mill converted side material speed are set, and in the process computer 70, the post rolled sheet thickness and the finished rolling mill outlet side converted material speed are obtained. The clearance and the rotational speed of the upper and lower work rolls 19 of each rolling mill constituting the finish rolling mill 18 in the hot rolling line 100 are obtained by calculation, and the gap between the upper and lower work rolls 19 of each of the rolling mills actually determined is calculated. Commands are given to actuators (not shown) that adjust the clearances and rotation speeds of the upper and lower work rolls 19 of the respective rolling mills so as to achieve the rotation speeds.
なお、被圧延材8を仕上圧延機18にて圧延する際の速度は、図5に示すごとく、被圧延材8の先端が第一圧延機であるF1に噛み込んで(オンして)以降、同先端がコイラー24に巻き付くまでは、スレッディング速度と呼ばれる低速に制御されるが、同先端がコイラー24に巻き付いて以降は、ある加速率にて加速され、トップ速度と呼ばれる比較的高速に達したのちは、そのトップ速度に維持されるよう制御される。そして、被圧延材8の尾端が第一圧延機であるF1(トップ速度が低くなるにつれ、F2やF3と後段圧延機にする場合もあるが)を抜けて(オフして)以降は、ある減速率にて減速され、クリーピング速度と呼ばれる低速まで減速された後、同クリーピング速度にて被圧延材8の尾端を巻き取り終わるように制御される。   In addition, as shown in FIG. 5, the speed at the time of rolling the to-be-rolled material 8 with the finish rolling mill 18 is after the front-end | tip of the to-be-rolled material 8 bites into F1 which is a 1st rolling mill (it turns on). Until the tip is wound around the coiler 24, the speed is controlled at a low speed called a threading speed. However, after the tip is wound around the coiler 24, the tip is accelerated at a certain acceleration rate to a relatively high speed called a top speed. Once reached, it is controlled to maintain its top speed. And after the tail end of the material 8 to be rolled is F1 (which may be used as F2 or F3 and a subsequent rolling mill as the top speed becomes lower) as the first rolling mill, (after turning off), After being decelerated at a certain deceleration rate and decelerating to a low speed called a creeping speed, control is performed so that the tail end of the material 8 to be rolled is finished at the creeping speed.
その関係で、先述のように、プロセスコンピュータ70よりも上位のビジネスコンピュータ90から、目標とする被圧延材8の仕上圧延後板厚と仕上圧延機出側換算被圧延材速度を設定する際には、あわせて、スレッディング速度、加速率、トップ速度、減速率なども設定する。クリーピング速度は、多くの場合、固定値であるため、プロセスコンピュータ70内や制御装置50内にもつ場合が多いが、クリーピング速度についても、プロセスコンピュータ70よりも上位のビジネスコンピュータ90から設定するようにしてもよい。   In this connection, as described above, when setting the post-rolling sheet thickness of the target rolled material 8 and the finished rolling mill delivery side converted material speed from the business computer 90 higher than the process computer 70 as described above. In addition, threading speed, acceleration rate, top speed, deceleration rate, etc. are also set. Since the creeping speed is often a fixed value, the creeping speed is often included in the process computer 70 or the control device 50. However, the creeping speed is also set from a business computer 90 higher than the process computer 70. You may do it.
プロセスコンピュータ70では、ビジネスコンピュータ90から設定された仕上圧延機出側換算被圧延材速度になるための熱間圧延ライン100における仕上圧延機18を構成する各圧延機の上下ワークロール19の回転速度を計算により求めるにあたっては、同じくプロセスコンピュータ70内で、成分や材質あるいは仕上圧延後寸法などをキーとして索引するテーブル値や、これとは別のモデル式により決定される先進率で、先述の仕上圧延機出側換算被圧延材速度を各圧延機にて圧延後の被圧延材8の設定板厚の、仕上圧延後板厚に対する比で除したものを、さらに除して計算する。   In the process computer 70, the rotational speed of the upper and lower work rolls 19 of each rolling mill constituting the finishing mill 18 in the hot rolling line 100 to reach the finishing rolling mill converted material speed set from the business computer 90. In the process computer 70, the above-mentioned finishing is performed with a table value that is indexed using the component, material, or dimensions after finishing rolling as a key, or an advanced rate determined by a model formula different from this. Calculated by further dividing the rolling mill delivery side converted material speed divided by the ratio of the set sheet thickness of the material to be rolled 8 after rolling in each rolling mill to the sheet thickness after finish rolling.
さて、各圧延機の上下ワークロール19の間隙と回転速度を調整する図示しない各アクチュエータは、指令を受けると、指令された各圧延機の上下ワークロール19の間隙と回転速度になるよう、実際に、動作、制定され、被圧延材8の先端が各圧延機に噛み込んでくるのを待つ。   Now, each actuator (not shown) that adjusts the clearance and the rotational speed of the upper and lower work rolls 19 of each rolling mill is actually set so as to be the clearance and the rotational speed of the upper and lower work rolls 19 of each commanded rolling mill when receiving a command. Then, it waits for the tip of the material to be rolled 8 to bite into each rolling mill.
被圧延材8の先端が各圧延機に噛み込んだら、今までの一般的な熱間圧延では、被圧延材8の先端、例えば、最先端から仕上圧延機18の最終圧延機F7で圧延後の長さに換算して5m内外圧延搬送したポイントにて、圧延荷重をロックオンし、以降、ロックオンした圧延荷重からの偏差に適当なゲインを乗じて上下ワークロール19の間隙を開閉制御する、AGC(Automatic Gauge Control)と呼ばれる制御が行われるところである。   When the tip of the material to be rolled 8 bites into each rolling mill, in the conventional hot rolling so far, after rolling at the tip of the material 8 to be rolled, for example, the final rolling mill F7 of the finishing mill 18 from the most advanced The rolling load is locked on at the point of 5 m inside and outside rolled in terms of the length of the roll, and thereafter, the gap between the locked on rolling load is multiplied by an appropriate gain, and the gap between the upper and lower work rolls 19 is controlled to open and close. This is where control called AGC (Automatic Gauge Control) is performed.
これに代え、本発明では、被圧延材の切除予定部分が切除予定部分以外に比べ局部的に薄くなるように、熱間圧延ラインにおける仕上圧延機にて被圧延材を圧延中に、走間板厚変更する。   Instead, in the present invention, during the rolling of the material to be rolled by a finish rolling mill in a hot rolling line, the portion to be cut of the material to be rolled is locally thinner than the portion to be cut. Change the plate thickness.
ここではその実施の形態の一例として、次のような場合について説明する。図1に示すように、被圧延材8の先端が仕上圧延機18の最終圧延機F7に噛み込んだら、直後にF7では走間板厚変更を開始し、圧延後板厚を徐々に厚くしていき、最先端から仕上圧延機18の最終圧延機F7にて圧延後の長さに換算して5m圧延搬送したポイントにて、最先端に比べ、2mm、圧延後板厚が厚くなるように制御する。そして、被圧延材8の尾端が仕上圧延機18の最終圧延機の一つ手前の第六圧延機F6を抜けてから、最終圧延機F7の搬送方向入側に、最終圧延機F7にて圧延後の長さに換算して5m分にF7にて圧延後の板厚を乗じた単位幅あたり体積をさらにF7入側の長さに換算した長さを残して、走間板厚変更を開始し、圧延後板厚を徐々に薄くしていき、最先端から仕上圧延機18の最終圧延機F7で圧延後の長さに換算して5m圧延搬送したポイント(ちょうど被圧延材8の尾端がF7を抜けるポイント)にて、走間板厚変更開始時に比べ、2mm、圧延後板厚が薄くなるように制御する。   Here, the following case will be described as an example of the embodiment. As shown in FIG. 1, when the tip of the material to be rolled 8 is caught in the final rolling mill F7 of the finishing mill 18, immediately after F7, the plate thickness change is started and the thickness after rolling is gradually increased. From the most advanced point, the final rolling mill F7 of the finish rolling mill 18 is converted to the length after rolling by 5m and conveyed by 5m so that the plate thickness after rolling is 2mm thicker than the most advanced. Control. Then, after the tail end of the material to be rolled 8 passes through the sixth rolling mill F6 that is one before the final rolling mill of the finish rolling mill 18, the final rolling mill F7 enters the conveyance direction entry side of the final rolling mill F7. Convert the length after rolling to 5m and multiply the sheet thickness after rolling at F7 by 5mm, and leave the length converted to the length on the F7 entry side, and change the running thickness. Start, gradually reduce the sheet thickness after rolling, and from the most advanced point of the final rolling mill F7 of the finishing mill 18 converted to the length after rolling 5m rolled point (just the tail of the material 8 to be rolled) At the point where the end passes through F7), control is performed so that the thickness after rolling is reduced by 2 mm compared to the time when the thickness change is started.
被圧延材8の尾端における走間板厚変更開始のタイミングについては、仕上圧延機18を構成する各圧延機の上下ワークロール19を回転駆動する図示しないアクチュエータ(電動機)の駆動軸には、最終圧延機F7の上下ワークロール19を回転駆動する図示しないアクチュエータ(電動機)も含め、ロータリーエンコーダなどの回転速度や、一つ前の圧延機である第六圧延機F6を被圧延材8の尾端が抜けて(オフして)以降などののべ回転数を計測できるセンサが取り付けられているため、上下ワークロール19を回転駆動する図示しないアクチュエータ(電動機)の駆動軸に取り付けられたセンサからの信号を制御装置50が時々刻々に受信し、上下ワークロール19を回転駆動する図示しないアクチュエータ(電動機)のどちらかあるいは両者平均ののべ回転数に、別途プロセスコンピュータ70から制御装置50に伝送されてくる最終圧延機F7の上下ワークロール19の直径と円周率と後進率を乗じた値が、第六圧延機F6と最終圧延機F7の各中心位置間の機械長から、先述の、最終圧延機F7にて圧延後の長さに換算して5m分にF7にて圧延後の板厚を乗じた単位幅あたり体積をさらにF7入側の長さに換算した長さを差し引いた値に達した時点で、制御装置50からの指令により、走間板厚変更を開始すればよい。   As for the timing of starting the change of the running plate thickness at the tail end of the material 8 to be rolled, on the drive shaft of an actuator (electric motor) (not shown) that rotationally drives the upper and lower work rolls 19 of each rolling mill constituting the finish rolling mill 18, Including the actuator (electric motor) (not shown) that rotationally drives the upper and lower work rolls 19 of the final rolling mill F7, the rotational speed of a rotary encoder or the like, and the sixth rolling mill F6, which is the previous rolling mill, are adjusted to the tail of the material 8 to be rolled. Since a sensor capable of measuring the total number of rotations after the end is removed (turned off) or the like is attached, the sensor attached to the drive shaft of an actuator (electric motor) (not shown) that rotationally drives the upper and lower work rolls 19 Of the actuator (electric motor) (not shown) that the control device 50 receives from time to time and drives the upper and lower work rolls 19 to rotate. Alternatively, the value obtained by multiplying the average rotational speed of the two by the diameter of the upper and lower work rolls 19 of the final rolling mill F7 separately transmitted from the process computer 70 to the control device 50, the circumferential ratio, and the reverse speed is the sixth. From the mechanical length between the center positions of the rolling mill F6 and the final rolling mill F7, the length after rolling in the final rolling mill F7 was converted to the length after rolling in F7 for 5 m. When the volume per unit width reaches a value obtained by subtracting the length converted to the length on the F7 entry side, the change of the running plate thickness may be started by a command from the control device 50.
ここで、最終圧延機F7で被圧延材8を圧延する際の後進率は、同先進率に、最終圧延機F7で圧延する前の板厚(F6で圧延後の被圧延材8の設定板厚)の、最終圧延機F7で圧延後の被圧延材8の設定板厚(仕上圧延後板厚)に対する比を乗じて計算することで求められる。   Here, the reverse rate when rolling the material 8 to be rolled by the final rolling mill F7 is the same advanced rate as the plate thickness before rolling by the final rolling machine F7 (set plate of the material 8 after rolling by F6) (Thickness) is calculated by multiplying the ratio by the ratio of the set sheet thickness (sheet thickness after finish rolling) of the material 8 to be rolled after rolling in the final rolling mill F7.
なお、被圧延材8の先端が各圧延機に噛み込んで以降、被圧延材8の先端における走間板厚変更が終了したのちは、被圧延材8の最先端から仕上圧延機18の最終圧延機F7で圧延後の長さに換算して5m圧延搬送したポイントにて、圧延荷重をロックオンし、以降、ロックオンした圧延荷重からの偏差に適当なゲインを乗じて上下ワークロール19の間隙を開閉制御する、AGC(Automatic Gauge Control)と呼ばれる制御を行うのが好ましく、同AGCは、被圧延材8の尾端が仕上圧延機18の最終圧延機F7よりも一つ手前の圧延機F6を抜けてから、最終圧延機F7の搬送方向入側に、最終圧延機F7で圧延後の長さに換算して5m分にF7で圧延後の板厚を乗じた単位幅あたり体積をさらにF7入側の長さに換算した長さを残して、打ち切るようにするのが好ましい。   In addition, after the tip of the material to be rolled 8 is bitten into each rolling mill, after the change of the running plate thickness at the tip of the material to be rolled 8 is finished, the final rolling mill 18 is finished from the forefront of the material 8 to be rolled. The rolling load is locked on at the point where the rolling length is converted to the length after rolling by the rolling mill F7, and the rolling load is locked on. Thereafter, the deviation from the rolling load locked on is multiplied by an appropriate gain, and the upper and lower work rolls 19 are It is preferable to perform control called AGC (Automatic Gauge Control) for controlling the opening and closing of the gap. The AGC is a rolling mill whose tail end of the material to be rolled 8 is one before the final rolling mill F7 of the finish rolling mill 18. After passing through F6, the volume per unit width obtained by multiplying the length after rolling by the final rolling mill F7 on the entry side in the conveying direction of the final rolling mill F7 and multiplying the thickness after rolling by F7 by 5 m Leave the length converted to the length of the F7 entry side, hit It is preferable to cut.
上記の実施の形態中、F7で圧延後の長さに換算して5mについて走間板厚変更を行っているが、5mという数字は一義的なものではなく、あくまで一例であって、各社各工場での事情により、適宜な長さに変更してよい。一般的には、1乃至20mとするのが好ましい。そして、走間板厚変更は、特許文献1のような方法を基本的に踏襲すればよく、これに改良を加えた方法を用いてもよい。   In the above-described embodiment, the sheet thickness change is performed for 5 m in terms of the length after rolling in F7, but the number of 5 m is not unique and is merely an example, and each company Depending on the circumstances at the factory, it may be changed to an appropriate length. Generally, it is preferably 1 to 20 m. And the thickness change between running should just follow the method like patent document 1, and you may use the method which added the improvement to this.
なお、以上説明した実施の形態では、被圧延材8の先尾端の切除予定部分が局部的に薄くなるように、熱間圧延ライン100における仕上圧延機18にて被圧延材8を圧延中に、走間板厚変更する場合について説明したが、本発明はこれに限るものではなく、被圧延材同士を接合して連続的に仕上圧延する、いわゆる連続熱間圧延を行う場合に、被圧延材同士の接合部分について、切除予定部分が局部的に薄くなるように、仕上圧延機にて被圧延材を圧延中に、走間板厚変更したり、あるいは、二以上のオーダーが一本の被圧延材に割り付けられたような場合に、二つのオーダーの境界の部分を挟んで走間板厚変更するに際し、切除予定部分が局部的に薄くなるように走間板厚変更したりする場合にも、同様に適用できる。なお、その場合、可能な限り、走間板厚変更がされる被圧延材部分を短くすることが、少しでも高い歩留まりを得る上で好ましい。   In the embodiment described above, the material to be rolled 8 is being rolled by the finish rolling mill 18 in the hot rolling line 100 so that the planned cutting end portion of the material to be rolled 8 is locally thinned. However, the present invention is not limited to this, and the present invention is not limited to this. During rolling of the material to be rolled by a finish rolling mill, or the order of two or more orders is made so that the portion to be cut is locally thinned at the joint between the rolled materials When changing the running plate thickness across the boundary part of two orders, the running plate thickness is changed so that the portion to be cut is locally thinned. The same applies to the case. In this case, it is preferable to shorten the portion of the material to be rolled whose thickness is changed as much as possible in order to obtain a high yield as much as possible.
また、以上説明した実施の形態では、図3に示した、熱間圧延ライン100にて熱延鋼帯を熱間圧延する場合を例にとって説明したが、走間板厚変更が可能な仕上圧延機をもつものであれば、セミコン、フルコン、スリークォータ、ステッケルミル、ヌーコアタイプなど、熱間圧延ライン100以外の形式のあらゆる熱間圧延ラインにて、鋼帯以外も含めたあらゆる熱延金属帯を熱間圧延する場合について、本発明は適用できる。   Moreover, in embodiment described above, although demonstrated as an example the case where hot-rolled steel strip was hot-rolled in the hot-rolling line 100 shown in FIG. 3, finish rolling in which a strip thickness change is possible. As long as it has a machine, all hot rolled metal strips, including those other than steel strips, in any hot rolling line other than the hot rolling line 100, such as semi-con, full con, three-quarter, steckel mill, nucore type, etc. The present invention can be applied to the case of hot rolling.
厚さ250mm、長さ9mのスラブを、10mmに熱間圧延するに際し、先端と尾端各5mについて、それぞれ、8mmから10mm、10mmから8mmの傾斜板厚分布になるよう圧延した。 When a slab having a thickness of 250 mm and a length of 9 m was hot-rolled to 10 mm, the tip and tail ends were each rolled to have an inclined plate thickness distribution of 8 mm to 10 mm and 10 mm to 8 mm.
この場合、同じ5mを切除し屑化するにしても、図2に示すごとく、従来全長10mmに圧延していた場合の歩留まり95.6%に比べ、96.0%まで歩留まりが向上する。   In this case, even if the same 5 m is excised and scrapped, as shown in FIG. 2, the yield is improved to 96.0% compared to the yield of 95.6% when the total length is rolled to 10 mm.
本発明の実施の形態の一例について説明するための線図Diagram for explaining an example of an embodiment of the present invention 本発明の効果について説明するための線図Diagram for explaining the effect of the present invention 熱間圧延ラインについて説明するための線図Diagram for explaining hot rolling line 非定常部分ができる理由について説明するための線図Diagram for explaining why unsteady parts are formed 被圧延材を熱間圧延ラインの仕上圧延機にて圧延する際の速度について説明するための線図Diagram for explaining the speed at which the material to be rolled is rolled by a finish rolling mill in a hot rolling line
符号の説明Explanation of symbols
8 被圧延材
10 加熱炉
12 粗圧延機
135 エッジャーロール
14 クロップシャー
15 仕上入側温度計
16 デスケーリング装置
18 仕上圧延機
19 ワークロール
20 ルーパ
21 仕上出側温度計
22 仕上出側板厚計
23 ランナウトテーブル
24 コイラー
25 コイラー入側温度計
26 冷却関連設備
50 制御装置
70 プロセスコンピュータ
90 ビジネスコンピュータ
100 熱間圧延ライン
A 搬送方向
w 冷却水
8 Rolled material 10 Heating furnace 12 Rough rolling mill 135 Edger roll 14 Crop shear 15 Finishing-side thermometer 16 Descaling device 18 Finishing mill 19 Work roll 20 Looper 21 Finishing-side thermometer 22 Finishing-side thickness gauge 23 Runout table 24 Coiler 25 Coiler inlet side thermometer 26 Cooling related equipment 50 Controller 70 Process computer 90 Business computer 100 Hot rolling line A Conveying direction w Cooling water

Claims (5)

  1. 被圧延材の切除予定部分が該切除予定部分以外に比べ局部的に薄くなるように、熱間圧延ラインにおける仕上圧延機にて前記被圧延材を圧延中に、走間板厚変更する
    ことを特徴とする熱間圧延方法。
    The rolling plate thickness is changed during rolling of the material to be rolled in the finish rolling mill in the hot rolling line so that the portion to be cut of the material to be rolled is locally thinner than the portion other than the portion to be cut. A hot rolling method characterized.
  2. 被圧延材の先尾端の切除予定部分が該切除予定部分以外に比べ局部的に薄くなるように、熱間圧延ラインにおける仕上圧延機にて前記被圧延材を圧延中に、走間板厚変更する
    ことを特徴とする電縫管用熱延金属帯の熱間圧延方法。
    During rolling of the material to be rolled in a finish rolling mill in a hot rolling line, the thickness of the running plate is such that the portion to be cut at the leading end of the material to be rolled is locally thinner than the portion other than the portion to be cut. A hot rolling method for hot-rolled metal strips for electric resistance welded pipes, characterized by being changed.
  3. 熱延金属帯であって、該熱延金属帯の切除予定部分が該切除予定部分以外に比べ局部的に薄い
    ことを特徴とする熱延金属帯。
    A hot-rolled metal strip, wherein a portion to be cut of the hot-rolled metal strip is locally thinner than a portion other than the portion to be cut.
  4. 熱延金属帯であって、該熱延金属帯の先尾端の切除予定部分が該切除予定部分以外に比べ局部的に薄い
    ことを特徴とする電縫管用の請求項3の熱延金属帯。
    The hot-rolled metal strip according to claim 3, which is a hot-rolled metal strip, wherein a portion to be cut at the leading end of the hot-rolled metal strip is locally thinner than a portion other than the portion to be cut. .
  5. 請求項4の熱延金属帯を素材として製造した電縫管。 An electric resistance welded tube manufactured using the hot-rolled metal strip according to claim 4 as a raw material.
JP2008038119A 2008-02-20 2008-02-20 Hot rolling method, hot-rolled metal band and electric resistance welded tube Pending JP2009195925A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013193121A (en) * 2012-03-22 2013-09-30 Kobe Steel Ltd Rolling method of rolled material
CN109128714A (en) * 2018-10-13 2019-01-04 山东盛阳金属科技股份有限公司 A kind of Stainless Steel-Carbon Steel Clad Sheet hot continuous rolling large-scale preparation method

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JPS58122111A (en) * 1982-01-18 1983-07-20 Toshiba Corp Method and device for controlling rolling mill
JPS58199611A (en) * 1982-05-17 1983-11-21 Nippon Kokan Kk <Nkk> Rolling method of off-gauge part
JPS63155202A (en) * 1986-12-18 1988-06-28 Kawasaki Steel Corp Extracting method for tracking data
JPH0433776A (en) * 1990-05-29 1992-02-05 Sumitomo Metal Ind Ltd Method for joining band steels for resistance welded tube
JP2005219063A (en) * 2004-02-03 2005-08-18 Jfe Steel Kk Rolling method in cold tandem mill
JP2005319495A (en) * 2004-05-11 2005-11-17 Kobe Steel Ltd Method of hot finish rolling, and material rolled by the same

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JPS4931566A (en) * 1972-07-21 1974-03-22
JPS58122111A (en) * 1982-01-18 1983-07-20 Toshiba Corp Method and device for controlling rolling mill
JPS58199611A (en) * 1982-05-17 1983-11-21 Nippon Kokan Kk <Nkk> Rolling method of off-gauge part
JPS63155202A (en) * 1986-12-18 1988-06-28 Kawasaki Steel Corp Extracting method for tracking data
JPH0433776A (en) * 1990-05-29 1992-02-05 Sumitomo Metal Ind Ltd Method for joining band steels for resistance welded tube
JP2005219063A (en) * 2004-02-03 2005-08-18 Jfe Steel Kk Rolling method in cold tandem mill
JP2005319495A (en) * 2004-05-11 2005-11-17 Kobe Steel Ltd Method of hot finish rolling, and material rolled by the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013193121A (en) * 2012-03-22 2013-09-30 Kobe Steel Ltd Rolling method of rolled material
CN109128714A (en) * 2018-10-13 2019-01-04 山东盛阳金属科技股份有限公司 A kind of Stainless Steel-Carbon Steel Clad Sheet hot continuous rolling large-scale preparation method
CN109128714B (en) * 2018-10-13 2020-04-10 山东盛阳金属科技股份有限公司 Hot continuous rolling large-scale preparation method of stainless steel-carbon steel composite plate

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