JP2001239315A - Method of manufacturing electric-seam welded steel pipe and equipment line - Google Patents
Method of manufacturing electric-seam welded steel pipe and equipment lineInfo
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- JP2001239315A JP2001239315A JP2000051432A JP2000051432A JP2001239315A JP 2001239315 A JP2001239315 A JP 2001239315A JP 2000051432 A JP2000051432 A JP 2000051432A JP 2000051432 A JP2000051432 A JP 2000051432A JP 2001239315 A JP2001239315 A JP 2001239315A
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- pipe
- bead
- seam
- rolling
- heating
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電縫鋼管の製造方
法および設備列に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an electric resistance welded steel pipe and an equipment line.
【０００２】[0002]
【従来の技術】電縫鋼管の製造には、高周波電流を利用
した電気抵抗溶接法が主として利用されている。これ
は、連続的に帯鋼を供給し、成形ロールで管状にロール
成形してオープン管とし、続いて高周波電流によりオー
プン管の両エッジ部端面を鋼の融点以上に加熱した後、
スクイズロールで両エッジ部端面を圧接して製品管とす
る方法である（例えば、第３版鉄鋼便覧第III 巻（２）
1056〜1092頁）。なお、本発明では、上記工程中、オー
プン管両エッジ部端面の加熱から圧接までを電縫溶接と
称する。2. Description of the Related Art An electric resistance welding method using a high-frequency current is mainly used for manufacturing an electric resistance welded steel pipe. This is to supply the steel strip continuously, roll form it into a tube with a forming roll to form an open tube, and then heat both end portions of the open tube to a temperature higher than the melting point of the steel by high-frequency current,
This is a method in which the end surfaces of both edges are pressed into contact with a squeeze roll to form a product pipe (for example, 3rd Edition Steel Handbook, Volume III (2))
1056-1092). In the present invention, during the above process, from the heating to the pressing of the end faces of both edges of the open pipe is referred to as ERW.
【０００３】この製造方法では、製品管サイズに合わせ
たロール成形機を用いなければならず、小ロット多品種
生産に相応しくない。そのため、例えば、特開昭63-331
05号公報、特開平2-187214号公報には、電縫溶接後の素
管を冷間で絞り圧延して製品管とする方法が提案されて
いる。しかし、この方法では、冷間で絞り圧延するた
め、圧延荷重が大きくミルの大型化を必要とし、さらに
ロールとの焼付き防止のため、潤滑圧延装置の設置が必
要となるなどの問題があった。In this manufacturing method, a roll forming machine corresponding to the product tube size must be used, which is not suitable for small lot multi-product production. Therefore, for example, JP-A-63-331
No. 05 and Japanese Patent Application Laid-Open No. 2-187214 propose a method in which a raw pipe after electric resistance welding is cold drawn and rolled to obtain a product pipe. However, in this method, there is a problem that the rolling load is large and the mill needs to be increased in size because cold rolling is performed in cold rolling, and further, a lubricating rolling device needs to be installed in order to prevent seizure with rolls. Was.
【０００４】また、特開昭60-15082号公報、特公平2-24
606 号公報には、電縫溶接後の素管を熱間で絞り圧延す
る方法が提案されている。しかし、この方法では、帯を
500〜900 ℃に加熱し、成形、電縫溶接を行うため、造
管時のキズ発生、あるいは成形装置などの耐熱対策のた
めミルの構造が複雑化するなどの問題があった。[0004] Also, Japanese Patent Application Laid-Open No. Sho 60-15082,
Japanese Patent Publication No. 606 proposes a method of hot-rolling a raw tube after electric resistance welding. But with this method,
Since it is heated to 500 to 900 ° C., and forming and electric resistance welding are performed, there are problems such as generation of scratches at the time of pipe making, and complicated structure of the mill for heat resistance measures such as a forming apparatus.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、上記した従
来技術の問題点を解決し、小ロット多品種生産に有利
で、ミルの負荷も軽減でき、しかも加工性に優れ、表面
肌が美麗で焼付き疵もない製品管が得られる電縫鋼管の
製造方法および設備列を提供することを目的とする。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, is advantageous for small lot multi-product production, can reduce the load on the mill, has excellent workability, and has a beautiful surface skin. It is an object of the present invention to provide a method of manufacturing an electric resistance welded steel pipe capable of obtaining a product pipe free of seizure flaws and an equipment row.
【０００６】[0006]
【課題を解決するための手段】前記目的を達成するため
になされた本発明は、帯鋼をロール成形し、得られたオ
ープン管を電縫溶接し、得られた管を絞り圧延する各工
程を連続的に行う電縫鋼管の製造方法において、電縫溶
接後の管を、ビード切削し、次いで管全体を加熱し、40
0 ℃〜Ac3 変態点の温度域、好ましくは700 ℃〜Ac3 変
態点の温度領域で絞り圧延することを特徴とする電縫鋼
管の製造方法（本発明方法）である。SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a roll forming method for a steel strip, an electric resistance welding of an obtained open pipe, and a drawing and rolling of the obtained pipe. In the method for manufacturing an ERW steel pipe, the pipe after the ERW welding is bead-cut, and then the entire pipe is heated to 40%.
A method for producing an electric resistance welded steel pipe (the method of the present invention), characterized in that rolling is performed in a temperature range of 0 ° C. to the Ac 3 transformation point, preferably in a temperature range of 700 ° C. to the Ac 3 transformation point.
【０００７】本発明方法では、ビード切削した管を全周
加熱する前に、ビード圧延することが好ましい。また、
本発明方法では、ビード切削した管を全周加熱する前
に、シームアニールするもしくはシーム冷却するもしく
はシームアニール後シーム冷却することが好ましい。ま
た、本発明方法では、ビード切削した管を全周加熱する
前に、ビード圧延し、さらに、シームアニールするもし
くはシーム冷却するもしくはシームアニール後シーム冷
却することが好ましい。また、本発明方法では、前記絞
り圧延後の管を保熱または加熱することが好ましい。ま
た、本発明方法では、前記ロール成形の前に帯鋼幅端部
を面取り加工することが好ましい。In the method of the present invention, it is preferable to perform bead rolling before heating the bead-cut tube all around. Also,
In the method of the present invention, it is preferable to perform seam annealing, seam cooling, or seam cooling after seam annealing before heating the bead-cut tube all around. Further, in the method of the present invention, it is preferable that before the bead-cut pipe is heated all around, bead rolling is performed, and then, seam annealing, seam cooling, or seam cooling is performed after seam annealing. Further, in the method of the present invention, it is preferable that the tube after the drawing rolling is kept or heated. Further, in the method of the present invention, it is preferable to chamfer a width end portion of the steel strip before the roll forming.
【０００８】また、本発明は、帯鋼を払い出すアンコイ
ラと、帯鋼を中継ぎ溶接する中継溶接機と、帯鋼を蓄え
て払い出すルーパと、帯鋼をオープン管にロール成形す
るロール成形機と、オープン管を電縫溶接して管にする
電縫溶接装置（誘導コイルおよびスクイズロール）と、
管を絞り圧延するレデューサとをこの順に配置してなる
電縫鋼管の製造設備列において、前記電縫溶接装置と前
記レデューサの間に、管をビード切削するビード切削装
置と、管を全周加熱する加熱装置とをこの順に配置した
ことを特徴とする電縫鋼管の製造設備列（本発明設備
列）である。[0008] The present invention also provides an uncoiler for dispensing a steel strip, a relay welding machine for relay-welding the steel strip, a looper for storing and discharging the steel strip, and a roll forming machine for roll-forming the steel strip into an open pipe. And an ERW welding device (induction coil and squeeze roll) to make an open pipe by ERW welding.
In a row of ERW steel pipe manufacturing equipment in which reducers for drawing and rolling a pipe are arranged in this order, a bead cutting apparatus for bead cutting a pipe between the ERW welding apparatus and the reducer, and a pipe heated all around. And a heating device for producing ERW steel pipes (a device line of the present invention).
【０００９】本発明設備列では、前記ビード切削装置と
前記加熱装置の間に、管をビード圧延するビード圧延装
置、管をシームアニールするシームアニール装置、管を
シーム冷却するシーム冷却装置のうち１種を、または２
種以上をこの順に、配置したものが好ましい。また、本
発明設備列では、レデューサ内に絞り圧延途上の管を加
熱する中間加熱装置を設けたものが好ましい。また、本
発明設備列では、前記レデューサの下流に管を保熱また
は加熱する熱処理装置を配置したものが好ましい。ま
た、本発明設備列では、前記ルーパと前記ロール成形機
の間に帯鋼幅端部を面取り加工する面取り加工装置を配
置したものが好ましい。In the equipment row of the present invention, one of a bead rolling device for bead rolling a tube, a seam annealing device for seam annealing a tube, and a seam cooling device for seam cooling a tube is provided between the bead cutting device and the heating device. Seed or 2
It is preferable that at least the seeds are arranged in this order. Further, in the equipment line of the present invention, it is preferable that an intermediate heating device for heating the pipe in the process of drawing and rolling is provided in the reducer. Further, in the equipment line of the present invention, it is preferable that a heat treatment apparatus for keeping or heating the pipe is arranged downstream of the reducer. Further, in the equipment row of the present invention, it is preferable that a chamfering device for chamfering the end portion of the strip width is disposed between the looper and the roll forming machine.
【００１０】[0010]
【発明の実施の形態】本発明方法では、電縫溶接後の管
（素管）を連続的に絞り圧延して製品管サイズに仕上げ
る。これにより、多数の製品管サイズを少数の素管サイ
ズに統合でき、そのためロールサイズの保有数を削減で
き、かつロール交換頻度も低減できることとなって、小
ロット多品種生産への対応が可能となる。また、連続工
程のため生産性も高い。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the method of the present invention, a pipe (raw pipe) after ERW is continuously drawn and rolled to a finished pipe size. As a result, many product tube sizes can be integrated into a small number of raw tube sizes, thereby reducing the number of roll sizes and reducing the frequency of roll changes, making it possible to cope with small lot multi-product production. Become. In addition, productivity is high because of the continuous process.
【００１１】電縫溶接後の管シーム部には、圧接（アプ
セット）により管厚み方向に押し出され盛り上がった溶
融凝固部および未溶融増肉部からなるビードが存在し、
このビード付きの管を絞り圧延すると、仕上寸法不良や
圧延ロール損傷を招くので、絞り圧延の前にビード切削
を行う必要がある。このビード切削は、ビードが600℃
以上にあるうちに行うのが、被削抵抗が小さくて好まし
い。なお、ビード切削を行うには、切削バイトを管の外
面側および内面側に配設して構成したビード切削装置を
用いるのがよい。In the seam portion of the pipe after the electric resistance welding, there is a bead composed of a melt-solidified portion and an unmelted thickened portion which are extruded and raised in the thickness direction of the pipe by pressure welding (upset).
If the beaded tube is drawn and rolled, the finished dimensions will be poor or the roll will be damaged. Therefore, it is necessary to cut the bead before drawing. In this bead cutting, the bead is 600 ℃
It is preferable to carry out while the above is being performed because the cutting resistance is small. In order to perform bead cutting, it is preferable to use a bead cutting device having cutting tools arranged on the outer surface and the inner surface of the pipe.
【００１２】絞り圧延において、圧延温度が400 ℃未満
では、材料の変形抵抗が高く、圧延荷重が増大し、その
結果管外面にロール焼付き疵が発生する。また、材料が
青熱脆化し圧延中に破断するおそれや、材料の変形抵抗
が増大し圧延が困難となるおそれや、再結晶が不十分と
なり加工歪が残存しやすくなるおそれがある。一方、圧
延温度がAc3 変態点（以下適宜単にAc3 と記す）超で
は、圧延中に発生するスケールの噛み込み疵により、管
外面の表面粗さが増大し、表面肌が劣化するとともに、
再結晶後のフェライト粒の成長が著しくなり強度低下の
わりには延性が向上しない。そのため、絞り圧延は400
℃〜Ac3 の温度域で行う必要がある。なお、製品管の加
工性をよりいっそう向上させるには、700 ℃〜Ac3 の温
度域で絞り圧延するのが好ましい。When the rolling temperature is less than 400 ° C. in the reduction rolling, the deformation resistance of the material is high, the rolling load increases, and as a result, roll seizure flaws occur on the outer surface of the tube. In addition, the material may become blue embrittled and break during rolling, the deformation resistance of the material may increase, and rolling may be difficult, or recrystallization may be insufficient and processing strain may easily remain. On the other hand, when the rolling temperature exceeds the Ac 3 transformation point (hereinafter, simply referred to as Ac 3 as appropriate), the surface roughness of the outer surface of the tube increases due to the biting flaw of the scale generated during rolling, and the surface skin deteriorates,
Ferrite grains grow remarkably after recrystallization, and ductility does not improve at the expense of strength. Therefore, reduction rolling is 400
It is necessary to carry out in a temperature range of ° C. to Ac 3 . In order to further improve the workability of the product tube, it is preferable to perform rolling in a temperature range of 700 ° C. to Ac 3 .
【００１３】絞り圧延温度を400 ℃〜Ac3 の範囲に確保
するためには、絞り圧延前の管を420 ℃〜Ac3 ＋50℃、
より好ましくは730 ℃〜Ac3 ＋50℃に全周加熱する必要
がある。前記全周加熱の加熱方式はとくに限定されず、
ゾーン長さの制約などを考慮して、炉加熱（輻射方
式）、誘導加熱等の単独あるいは組合せを適宜採用すれ
ばよい。なお、輻射方式を採用した場合、管の輻射熱吸
収を良くして炉加熱効率を高める観点から、加熱前の素
管外面は黒色にしておくことが好ましい。管外面を黒色
にするには、黒色スケール付きの帯鋼を用いる、管外面
に黒色塗料を塗布するなど、種々の方法が採用できる。[0013] In order to secure the reduction rolling temperature in the range of 400 ° C to Ac 3 , the pipe before the reduction rolling is 420 ° C to Ac 3 + 50 ° C,
More preferably, the entire circumference must be heated to 730 ° C. to Ac 3 + 50 ° C. The heating method of the entire circumference heating is not particularly limited,
Considering restrictions on the zone length and the like, furnace heating (radiation method), induction heating, or the like may be used alone or in combination as appropriate. When the radiation method is adopted, it is preferable to blacken the outer surface of the raw tube before heating from the viewpoint of improving the radiant heat absorption of the tube and increasing the furnace heating efficiency. Various methods can be adopted to blacken the outer surface of the tube, such as using a steel strip with a black scale or applying a black paint to the outer surface of the tube.
【００１４】絞り圧延は、Ｎ本の孔型ロールを円周方向
に配置してなるスタンドを複数タンデムに配列して構成
されたいわゆるＮロール方式のタンデム絞り圧延機（Ｎ
ロールレデューサといい、ロール本数不特定の場合単に
レデューサという）により連続的に行うのが好ましい。
１スタンドのロール本数Ｎは３〜４が好適である。スタ
ンド数は素管寸法、製品管寸法に応じて適宜決定するこ
とができる。The squeezing rolling is a so-called N-roll tandem squeezing rolling mill (N) in which a plurality of stands each having N grooved rolls arranged in the circumferential direction are arranged in tandem.
It is preferable to perform the process continuously by using a roll reducer, which is simply called a reducer when the number of rolls is unspecified.
The number N of rolls in one stand is preferably 3 to 4. The number of stands can be appropriately determined according to the dimensions of the raw tube and the product tube.
【００１５】また、絞り圧延における合計縮径率と１パ
ス当たりの縮径率については、必要に応じて以下のよう
な条件を採用することが好ましい。 〔合計縮径率〕合計縮径率は式(1) で定義されるが、こ
れが20％未満では回復・再結晶による結晶粒の微細化が
不十分であり、延性に富む製品管となり難いほか、造管
速度も遅く生産能率が低い。そのため、合計縮径率は20
％以上とするのが好ましい。また、合計縮径率が60％以
上では、加工硬化による強度増に加え組織の微細化が顕
著となり、低合金鋼素管からでも強度・延性ともに優れ
た製品管が得られる。そのため、合計縮径率は60％以上
とするのがより好ましい。As for the total diameter reduction ratio and the diameter reduction ratio per pass in the reduction rolling, it is preferable to adopt the following conditions as necessary. [Total diameter reduction rate] The total diameter reduction rate is defined by the formula (1). If the total diameter reduction rate is less than 20%, the crystal grains are not sufficiently refined by recovery and recrystallization, making it difficult to obtain a ductile product tube. Also, the tube production speed is slow and the production efficiency is low. Therefore, the total diameter reduction ratio is 20
% Or more is preferable. When the total diameter reduction ratio is 60% or more, the structure becomes finer in addition to the increase in strength due to work hardening, and a product tube excellent in both strength and ductility can be obtained even from a low alloy steel tube. Therefore, the total diameter reduction rate is more preferably set to 60% or more.
【００１６】 合計縮径率＝｛（素管外径−製品管外径）／素管外径｝×100(%) ……(1) 〔１パス当たりの縮径率〕１パス当たりの縮径率が絞り
圧延の全パスにわたり６％未満であると、回復・再結晶
による結晶粒の微細化が不十分となり、製品管の強度・
延性のバランスが悪くなるおそれがあるほか、加工発熱
による材料温度上昇に乏しく圧延温度の低下をきたしや
すい。このため、絞り圧延の全パス中少なくとも１パス
は、１パス当たりの縮径率６％以上とすることが好まし
い。なお、さらなる結晶粒微細化の観点からすれば、前
記１パス当たりの縮径率は６％以上よりも８％以上がよ
り好ましい。Total diameter reduction ratio = {(outer diameter of base pipe−outer diameter of product pipe) / outer diameter of base pipe} × 100 (%) (1) [Diameter reduction rate per pass] Reduction per pass If the diameter ratio is less than 6% over the entire pass of the reduction rolling, the grain refinement by recovery and recrystallization becomes insufficient, and the strength and
In addition to the possibility that the balance of ductility may be deteriorated, the material temperature rise due to the heat generated during processing is poor and the rolling temperature is likely to decrease. For this reason, it is preferable that at least one of all the passes of the reduction rolling has a diameter reduction ratio of 6% or more per pass. From the viewpoint of further refinement of crystal grains, the diameter reduction rate per pass is more preferably 8% or more than 6% or more.
【００１７】ところで、前記ビード切削だけでは、ビー
ドを完全に除去してシーム部の内外面をシーム部以外の
管周部分（母材部）と面一に平滑化することは困難で、
シーム部に若干の余肉部分が残り、これが絞り圧延で偏
肉を生じる原因となることがある。そこで、かかる余肉
部分を完全になくすために、ビード切削した管をさらに
ビード圧延することが好ましい。ビード圧延を行うに
は、ロールを管の内部と外部に配設して前記余肉部分を
内外面から圧下するよう構成したビード圧延装置を用い
るのが好適である。By the way, it is difficult to remove the bead completely and to smooth the inner and outer surfaces of the seam portion flush with the pipe peripheral portion (base material portion) other than the seam portion only by the bead cutting.
A small excess portion may remain in the seam portion, which may cause uneven thickness in reduction rolling. Therefore, in order to completely eliminate such excess portions, it is preferable to further bead-roll the bead-cut tube. In order to perform the bead rolling, it is preferable to use a bead rolling device in which rolls are disposed inside and outside the tube so that the excess portion is reduced from the inner and outer surfaces.
【００１８】また、シーム部はオーステナイト域からの
冷却途上で組織変態を生じて硬化し、この硬化した部分
が絞り圧延前の全周加熱では十分軟化せず、絞り圧延で
偏肉を生じる原因となることがある。そこで、管の全周
加熱前にシーム部を局部加熱して母材部と同程度に軟化
させるいわゆるシームアニールを行うことが好ましい。
局部加熱条件は、温度：Ac3 変態点−100 ℃〜Ac3 変態
点＋50℃×保持時間：１〜10秒が好ましい。局部加熱方
式は特に限定されず、輻射方式、誘導方式のいずれも適
宜選択採用できる。In addition, the seam portion undergoes structural transformation during the cooling from the austenite region and hardens, and the hardened portion does not sufficiently soften by heating all around before the reduction rolling and causes uneven thickness in the reduction rolling. May be. Therefore, it is preferable to perform so-called seam annealing in which the seam portion is locally heated and heated to the same degree as the base material portion before heating the entire circumference of the tube.
The local heating conditions are preferably as follows: temperature: Ac 3 transformation point−100 ° C. to Ac 3 transformation point + 50 ° C. × retention time: 1 to 10 seconds. The local heating system is not particularly limited, and any of a radiation system and an induction system can be appropriately selected and adopted.
【００１９】また、限られた連続ライン長でシーム部を
自然放冷（空冷）するのでは全周加熱前にシーム部温度
が母材部温度（ほぼ常温）まで降下せず、この温度差が
全周加熱でも解消せず、絞り圧延において管周方向の温
度差に応じた変形抵抗差により偏肉を生じることがあ
る。そこで、全周加熱前にシーム部を空冷よりも速く冷
却するいわゆるシーム冷却を行うことが好ましい。シー
ム冷却の冷却方式は特に限定されず、衝風冷却、水スプ
レー冷却、ミストスプレー冷却等を適宜選択採用でき
る。If the seam is naturally cooled (air-cooled) with a limited continuous line length, the seam temperature does not drop to the base material temperature (almost room temperature) before the entire circumference is heated. It cannot be eliminated even by heating the entire circumference, and uneven rolling may occur due to a difference in deformation resistance in accordance with a temperature difference in the pipe circumferential direction in the rolling. Therefore, it is preferable to perform so-called seam cooling for cooling the seam portion faster than air cooling before heating the entire circumference. The cooling method of seam cooling is not particularly limited, and blast cooling, water spray cooling, mist spray cooling, or the like can be appropriately selected and adopted.
【００２０】ビード圧延、シームアニール、シーム冷却
は、必要に応じてこれらのうち１種または２種以上を実
行すればよいが、ビード圧延と他１種以上を併せ行う場
合には、シーム部がより高温（より低変形抵抗）の段階
で行う方が装置負荷をより軽減できて有利なビード圧延
を先にするのがよく、また、シームアニールとシーム冷
却を併せ行う場合には、より高温側にあるシーム部温度
を母材部温度に早く近づけるためにシーム冷却を後にす
るのがよい。The bead rolling, seam annealing, and seam cooling may be performed by one or more of these as necessary. However, when bead rolling is performed in combination with one or more other types, the seam portion is formed. It is better to carry out the bead rolling at a higher temperature (lower deformation resistance) stage because the load on the device can be reduced more and the advantageous bead rolling is performed first. In addition, when performing seam annealing and seam cooling together, the higher temperature side The seam cooling is preferably performed after the seam portion temperature in (1) to quickly approach the base material portion temperature.
【００２１】また、絞り圧延後の管は、程度の差はあれ
加工硬化しているため、その用途によっては延性や加工
性が不足する場合がある。そこで、必要に応じて絞り圧
延後の管を保熱または加熱することにより、これに所望
の延性や加工性を付与することが好ましい。この保熱ま
たは加熱の条件は、温度：600 ℃以上Ac3 変態点未満×
保持時間：10秒〜10分が好適である。保熱または加熱す
る手段は特に限定されず、炉、誘導コイル等々のいずれ
を選択採用してもよい。Further, since the pipe after the reduction rolling is work-hardened to a certain extent, ductility and workability may be insufficient depending on the use. Therefore, it is preferable to impart desired ductility and workability to the tube after drawing and rolling by heating or heating the tube as necessary. The conditions for this heat retention or heating are as follows: temperature: 600 ° C. or higher and lower than the Ac 3 transformation point
Holding time: 10 seconds to 10 minutes is preferred. Means for keeping or heating is not particularly limited, and any of a furnace, an induction coil, and the like may be selectively adopted.
【００２２】また、造管用素材である帯鋼としては、熱
延あるいは冷延鋼板を条切りしたものが使用されるが、
電縫溶接の突き合わせ部となる帯鋼幅端部には一般に条
切り時に生じたシヤーダレが存在し、これが接合不良の
原因となることがある。そこで、ロール成形の前に帯鋼
幅端部を面取り加工することにより、シヤーダレを除去
し、幅端面形状を一定に整えることが好ましい。Further, as a steel strip as a material for pipe making, a strip of hot rolled or cold rolled steel sheet is used.
At the end of the width of the steel strip serving as the butt portion of the electric resistance welding, there is generally a shearing generated at the time of the stripping, and this may cause a joining failure. Therefore, it is preferable that the width end portion of the steel strip is chamfered before the roll forming to remove the shearing and to make the width end surface shape constant.
【００２３】本発明設備列は、本発明方法の実施に適し
たものであり、図１（ａ）に第１例として示すように、
帯鋼Ｓを払い出すアンコイラ１と、帯鋼Ｓを中継ぎ溶接
する中継溶接機２と、帯鋼Ｓを蓄えて払い出すルーパ３
と、帯鋼Ｓをオープン管Ｐ’にロール成形するロール成
形機４と、オープン管Ｐ’を電縫溶接して管Ｐにする誘
導コイル５Ａ、スクイズロール５Ｂと、管Ｐを絞り圧延
するレデューサ６とをこの順に配置し、さらに、電縫溶
接装置５とレデューサ６の間に、管Ｐをビード切削する
ビード切削装置７（７Ａは内面側、６Ｂは外面側）と、
管Ｐを全周加熱する加熱装置８を配置したものである。
なお、20は絞り圧延後の管を処理する圧延後処理設備で
ある。The equipment sequence of the present invention is suitable for carrying out the method of the present invention. As shown in FIG.
An uncoiler 1 for dispensing the steel strip S, a relay welding machine 2 for relay-welding the steel strip S, and a looper 3 for storing and discharging the steel strip S
And a roll forming machine 4 for rolling the steel strip S into an open pipe P ', an induction coil 5A and a squeeze roll 5B for forming the pipe P by electric resistance welding of the open pipe P', and a reducer for drawing and rolling the pipe P. And a bead cutting device 7 (7A is an inner surface side, 6B is an outer surface side) between the ERW device 5 and the reducer 6 for bead cutting the pipe P.
A heating device 8 for heating the pipe P all around is arranged.
Reference numeral 20 denotes a post-rolling treatment facility for processing the pipe after the reduction rolling.
【００２４】加熱装置８としては、例えば図１（ｂ）に
示すような加熱炉８Ａ、例えば図１（ｃ）に示すような
誘導コイル８Ｂ、例えば図１（ｄ）に示すような加熱炉
８Ａと誘導コイル８Ｂの組合せ、等々を適宜採用でき
る。なお図１（ｄ）では誘導コイル８Ｂを加熱炉８Ａの
入側と出側の両方に設置しているが、場合に応じていず
れか一方を省略してもよい。As the heating device 8, for example, a heating furnace 8A as shown in FIG. 1B, an induction coil 8B as shown in FIG. 1C, for example, a heating furnace 8A as shown in FIG. And the combination of the induction coil 8B and the like can be appropriately adopted. In FIG. 1D, the induction coil 8B is installed on both the entrance side and the exit side of the heating furnace 8A, but one of them may be omitted as the case may be.
【００２５】また、例えば図１（ｅ）に示すように、レ
デューサ６内の適当なスタンド間に例えば誘導コイルか
らなる中間加熱装置16を設けることが、圧延温度の下が
り過ぎを防止する観点から好ましい。圧延後処理設備20
は、図２（ａ）に示すような第１型すなわちコイラ21で
管Ｐを巻き取るタイプと、図２（ｂ）に示すような第２
型すなわち管Ｐを定尺に切断して冷却床22に配列するタ
イプのいずれであってもよい。なお、図２において、23
は管を真っ直ぐに矯正する矯正機、13は管を切断する切
断機である。また、第２型では、図示のように切断機13
の下流にビード屑抜き装置14を設置することにより、管
内のビード切削屑を管外に排出する作業を効率化するこ
とができる。As shown in FIG. 1 (e), it is preferable to provide an intermediate heating device 16 composed of, for example, an induction coil between appropriate stands in the reducer 6 from the viewpoint of preventing the rolling temperature from dropping too much. . Post-rolling treatment equipment 20
Is a first type as shown in FIG. 2A, that is, a type in which the pipe P is wound by the coiler 21, and a second type as shown in FIG.
Any type, that is, a type in which the pipe P is cut to a fixed size and arranged on the cooling floor 22 may be used. In FIG. 2, 23
Is a straightening machine for straightening a pipe, and 13 is a cutting machine for cutting a pipe. Further, in the second type, as shown in FIG.
By installing the bead debris removal device 14 downstream of the pipe, the operation of discharging the bead debris in the pipe to the outside of the pipe can be made more efficient.
【００２６】本発明設備列では、ビード切削装置と加熱
装置の間に、管をビード圧延するビード圧延装置、管を
シームアニールするシームアニール装置、管をシーム冷
却するシーム冷却装置のうち１種を、または２種以上を
この順に、配置することにより、本発明方法におけるビ
ード圧延、シームアニール、シーム冷却の少なくともい
ずれかを効率よく実施することができる。なお、図３に
示す第２例は、ビード圧延装置９、シームアニール装置
10、シーム冷却装置11の３種を全て配置した実施形態で
あり、この実施形態では、ビード圧延、シームアニー
ル、シーム冷却のいずれをも必要に応じて直ちに実施す
ることができる。In the equipment line of the present invention, one of a bead rolling device for bead rolling a tube, a seam annealing device for seam annealing a tube, and a seam cooling device for seam cooling a tube is provided between a bead cutting device and a heating device. Or, by arranging two or more kinds in this order, at least one of bead rolling, seam annealing, and seam cooling in the method of the present invention can be efficiently performed. The second example shown in FIG. 3 is a bead rolling device 9, a seam annealing device.
This is an embodiment in which all three types of the seam cooling device 11 are arranged. In this embodiment, any of bead rolling, seam annealing, and seam cooling can be immediately performed as needed.
【００２７】また、本発明設備列では、図４に第３例と
して示すように、レデューサ６の下流の圧延後処理設備
20に管Ｐを保熱または加熱する熱処理装置12を配置すれ
ば、必要に応じて直ちに絞り圧延後の管を保熱または加
熱してその材質を制御することができて好ましい。ま
た、本発明設備列では、図５に第４例として示すよう
に、ルーパ３とロール成形機４の間に、帯鋼Ｓの幅端部
を面取り加工する面取り加工装置15を配置することによ
り、オープン管エッジ部端面形状を確実に調整すること
ができ、シヤーダレに起因する接合不良を防止すること
ができる。In the equipment row of the present invention, as shown as a third example in FIG.
If the heat treatment device 12 for keeping or heating the tube P is arranged in the tube 20, it is possible to control the material by heating or heating the tube after drawing and rolling as needed. Further, in the equipment row of the present invention, as shown as a fourth example in FIG. 5, by disposing a chamfering device 15 for chamfering the width end of the strip S between the looper 3 and the roll forming machine 4. In addition, the shape of the end face of the open pipe edge portion can be reliably adjusted, and joint failure due to shading can be prevented.
【００２８】なお、図６には、本発明設備列の第５例と
して、アンコイラ１、中継溶接機２、ルーパ３、面取り
加工装置15、ロール成形機４、誘導コイル５Ａ、スクイ
ズロール５Ｂ、ビード切削装置７、ビード圧延装置９、
シームアニール装置10、シーム冷却装置11、加熱装置
８、レデューサ６、圧延後処理設備20を順次配置したも
のを示す。レデューサ６内には中間加熱装置16を設け
た。FIG. 6 shows, as a fifth example of the equipment line of the present invention, an uncoiler 1, a relay welding machine 2, a looper 3, a chamfering device 15, a roll forming machine 4, an induction coil 5A, a squeeze roll 5B, a bead. Cutting device 7, bead rolling device 9,
This shows an arrangement in which a seam annealing device 10, a seam cooling device 11, a heating device 8, a reducer 6, and a post-rolling treatment facility 20 are sequentially arranged. An intermediate heating device 16 was provided in the reducer 6.
【００２９】第５例では、面取り加工装置15は帯鋼幅端
面を刃物切削するよう構成され、ロール成形機４は帯板
を連続的に曲げ加工してオープン管とするように構成さ
れ、誘導コイル５Ａは管の外周を取り巻くように構成さ
れ、スクイズロール５Ｂは加熱された帯両端面を圧接す
るように構成され、ビード圧延装置９はシーム部の内面
側と外面側に圧延ロールを配置して構成され、シームア
ニール装置10は誘導加熱コイルで構成され、シーム冷却
装置11はミストスプレー装置で構成されている。また、
加熱装置８は図１（ｄ）の形態に構成され、レデューサ
６は24スタンドの４ロールレデューサで構成されてい
る。圧延後処理設備20は図４（ｂ）のような形態すなわ
ち第２型に熱処理装置12およびビード屑抜き装置14を付
加した形態に構成されている。なお、熱処理装置12は保
熱・加熱両用の炉で構成されている。In the fifth example, the chamfering device 15 is configured to cut the width end face of the steel strip with a knife, and the roll forming machine 4 is configured to continuously bend the strip to form an open pipe. The coil 5A is configured to surround the outer circumference of the pipe, the squeeze roll 5B is configured to press the both end surfaces of the heated band, and the bead rolling device 9 arranges rolling rolls on the inner surface side and the outer surface side of the seam portion. The seam annealing device 10 is configured by an induction heating coil, and the seam cooling device 11 is configured by a mist spray device. Also,
The heating device 8 is configured as shown in FIG. 1D, and the reducer 6 is formed of a 24-roll 4-roll reducer. The post-rolling treatment equipment 20 is configured as shown in FIG. 4B, that is, in a form in which the heat treatment device 12 and the bead scrap removing device 14 are added to the second mold. Note that the heat treatment apparatus 12 is constituted by a furnace for both heat retention and heating.
【００３０】[0030]
【実施例】図６に示した本発明設備列の第５例を用い
て、ＪＩＳ ＳＴＫＭ13Ｂ相当組成（0.1 ％Ｃ−0.01％
Si−0.8 ％Mn鋼，Ac3 ＝849 ℃）の帯鋼をロール成形し
電縫溶接して外径90mmφの管とし、ビード切削し、表１
に示す各種条件でシーム部を処理し、加熱装置により表
１に示す温度に全周加熱してからレデューサにて造管速
度（レデューサ出側速度）200 〜350 ｍ/minで絞り圧延
し、製品サイズＡ（肉厚2.3 mm×外径50.8mmφ）、Ｂ
（肉厚2.0 mm×外径42.7mmφ）、Ｃ（肉厚1.8 mm×外径
25.4mmφ）に仕上げる造管実験を行った。圧延供用スタ
ンド数は製品サイズに応じて変更した。また、一部の管
は絞り圧延後表１に示す条件で熱処理した。また、一部
の帯鋼はロール成形前に幅端部の面取り加工を行った。EXAMPLE A composition corresponding to JIS STKM13B (0.1% C-0.01%) was prepared using the fifth example of the equipment line of the present invention shown in FIG.
Rolled steel strip of Si-0.8% Mn steel, Ac 3 = 849 ° C), welded by electric resistance welding to form a tube with an outer diameter of 90mmφ, and bead-cut.
The seam is treated under the various conditions shown in the table below, heated all the way to the temperature shown in Table 1 by a heating device, and then drawn by a reducer at a pipe forming speed (reducer exit side speed) of 200 to 350 m / min. Size A (wall thickness 2.3 mm x outer diameter 50.8 mmφ), B
(Thickness 2.0 mm x outer diameter 42.7 mmφ), C (thickness 1.8 mm x outer diameter
25.4mmφ) was performed. The number of rolling service stands was changed according to the product size. Some of the tubes were heat-treated under the conditions shown in Table 1 after rolling. Some of the strips were chamfered at the width ends before roll forming.
【００３１】この造管実験では、絞り圧延時の圧延荷
重、最終製品の表面肌、焼付疵、加工性を調査した。こ
こに、圧延荷重は同じ製品サイズの中で高位側５スタン
ドの平均が最も高かったものを100 とした指数で相対評
価し、表面肌は目視および触診で◎（優）、○（良）、
×（不良）を判定し、焼付疵は目視で○（無）、×
（有）を判定し、加工性は伸び（ＥＬ）で評価した。In this tube making experiment, the rolling load during drawing rolling, the surface texture of the final product, seizure flaws, and workability were investigated. Here, the rolling load was relatively evaluated by an index with the highest average of the five stands on the higher side among the same product size as 100, and the surface skin was visually and palpated as ◎ (excellent), ○ (good),
X (defective) was judged, and the seizure flaw was visually evaluated as ○ (none), ×
(Yes) was determined, and the workability was evaluated by elongation (EL).
【００３２】調査結果を表１に示す。The results of the investigation are shown in Table 1.
【００３３】[0033]
【表１】 [Table 1]
【００３４】表１に示すように、本発明の実施により、
従来の冷間〜400 ℃未満での絞り圧延時に生じる焼付疵
（比較例１〜４）および、従来の熱間での絞り圧延時に
生じる肌の劣化（比較例５）が解消された。さらに、従
来の冷間〜400 ℃未満の温度での絞り圧延では伸びが20
％に達せず（比較例１〜４）加工性が不良であるのに対
し、本発明では伸びが30％以上と良好である。As shown in Table 1, by implementing the present invention,
The seizure flaw (comparative examples 1 to 4) generated at the time of the conventional cold rolling at a temperature lower than 400 ° C. and the deterioration of the skin (comparative example 5) at the time of the conventional hot rolling at the hot rolling were eliminated. Furthermore, the elongation of the conventional cold rolling at a temperature of less than 400 ° C.
% (Comparative Examples 1 to 4), and the workability is poor, whereas the elongation of the present invention is as good as 30% or more.
【００３５】[0035]
【発明の効果】かくして本発明によれば、加工性に優
れ、表面肌が美麗で焼付疵もない電縫鋼管を、小ロット
多品種生産に応じて低ミル負荷操業で高能率に製造する
ことができるようになるという優れた効果を奏する。As described above, according to the present invention, an ERW steel pipe having excellent workability, a beautiful surface skin and no seizure scratches can be produced with high efficiency by low mill load operation in accordance with small lot multi-product production. It has an excellent effect that it can be performed.
【図１】（ａ）は本発明設備列の第１例を示す配置図、
（ｂ）〜（ｄ）は加熱装置の諸形態、（ｅ）は中間加熱
装置の設置例を示す模式図である。FIG. 1A is a layout diagram showing a first example of a facility row of the present invention,
(B)-(d) are the various forms of a heating apparatus, (e) is a schematic diagram which shows the example of installation of an intermediate heating apparatus.
【図２】圧延後処理設備の第１型（ａ）、第２型（ｂ）
を示す配置図である。FIG. 2 shows a first type (a) and a second type (b) of post-rolling treatment equipment.
FIG.
【図３】本発明設備列の第２例を示す配置図である。FIG. 3 is a layout diagram showing a second example of the equipment row of the present invention.
【図４】本発明設備列の第３例を示す配置図である。FIG. 4 is a layout diagram showing a third example of the equipment row of the present invention.
【図５】本発明設備列の第４例を示す配置図である。FIG. 5 is a layout diagram showing a fourth example of the equipment row of the present invention.
【図６】本発明設備列の第５例を示す配置図である。FIG. 6 is a layout diagram showing a fifth example of the equipment row of the present invention.
Ｓ 帯鋼 Ｐ’オープン管 Ｐ 管 １ アンコイラ ２ 中継溶接機 ３ ルーパ ４ ロール成形機 ５Ａ 誘導コイル ５Ｂ スクイズロール ６ レデューサ ７ ビード切削装置（７Ａ 内面側、６Ｂ 外面側） ８ 加熱装置（８Ａ 加熱炉、８Ｂ 誘導コイル） ９ ビード圧延装置 10 シームアニール装置 11 シーム冷却装置 12 熱処理装置 13 切断機 14 ビード屑抜き装置 15 面取り加工装置 16 中間加熱装置 20 圧延後処理設備 21 コイラ 22 冷却床 23 矯正機 S strip steel P 'open pipe P pipe 1 uncoiler 2 relay welder 3 looper 4 roll forming machine 5A induction coil 5B squeeze roll 6 reducer 7 bead cutting device (7A inside surface, 6B outside surface) 8 heating device (8A heating furnace, 8B Induction coil) 9 Bead rolling device 10 Seam annealing device 11 Seam cooling device 12 Heat treatment device 13 Cutting machine 14 Bead scrap removal device 15 Chamfering device 16 Intermediate heating device 20 Rolling post-processing equipment 21 Coiling machine 22 Cooling floor 23 Straightening machine
───────────────────────────────────────────────────── フロントページの続き (72)発明者 依藤 章 愛知県半田市川崎町１丁目１番地 川崎製 鉄株式会社知多製造所内 (72)発明者 河端 良和 愛知県半田市川崎町１丁目１番地 川崎製 鉄株式会社知多製造所内 (72)発明者 荒谷 昌利 愛知県半田市川崎町１丁目１番地 川崎製 鉄株式会社知多製造所内 (72)発明者 西森 正徳 愛知県半田市川崎町１丁目１番地 川崎製 鉄株式会社知多製造所内 (72)発明者 岡部 能知 愛知県半田市川崎町１丁目１番地 川崎製 鉄株式会社知多製造所内 Ｆターム(参考） 4E026 AA04 EA02 EA17 EA18 HA01 4E028 CA02 CA13 LA03 LA04 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akira Ito 1-1, Kawasaki-cho, Handa-shi, Aichi Prefecture Kawasaki Steel Corporation Chita Works (72) Inventor Yoshikazu Kawabata 1-1-1, Kawasaki-cho, Handa-shi, Aichi Prefecture Kawasaki Inside Chita Works, Steel Works (72) Inventor Masatoshi Araya 1-1-1, Kawasaki-cho, Handa-shi, Aichi Prefecture Inside Chita Works, Kawasaki Works (72) Inventor Masanori Nishimori 1-1-1, Kawasaki-cho, Handa-shi, Aichi Prefecture Kawasaki Chita Works, Steel Works (72) Inventor Nochika Okabe 1-1, Kawasaki-cho, Handa-shi, Aichi Prefecture F-term in Chita Works, Kawasaki Works (Reference)
Claims (12)
管を電縫溶接し、得られた管を絞り圧延する各工程を連
続的に行う電縫鋼管の製造方法において、電縫溶接後の
管を、ビード切削し、次いで管全体を加熱し、400 ℃〜
Ac3 変態点の温度域で絞り圧延することを特徴とする電
縫鋼管の製造方法。1. A method for manufacturing an ERW steel pipe in which a steel strip is roll-formed, the obtained open pipe is subjected to ERW welding, and the obtained pipe is continuously subjected to each step of drawing and rolling. Bead cutting, then heating the entire tube, 400 ° C ~
A method for producing an electric resistance welded steel pipe, comprising drawing in an Ac 3 transformation temperature range.
3 変態点とした請求項１記載の方法。2. Instead of the 400 ° C. to Ac 3 transformation point 700 ° C. to Ac
2. The method according to claim 1, wherein three transformation points are provided.
圧延することを特徴とする請求項１または２に記載の方
法。3. The method according to claim 1, wherein the bead-cut tube is bead-rolled before heating.
ムアニールするもしくはシーム冷却するもしくはシーム
アニール後シーム冷却することを特徴とする請求項１ま
たは２に記載の方法。4. The method according to claim 1, wherein the bead-cut tube is subjected to seam annealing, seam cooling, or seam cooling after seam annealing before heating.
圧延し、さらに、シームアニールするもしくはシーム冷
却するもしくはシームアニール後シーム冷却することを
特徴とする請求項１または２に記載の方法。5. The method according to claim 1, wherein the bead-cut tube is bead-rolled before heating, and further subjected to seam annealing, seam cooling, or seam cooling after seam annealing.
とを特徴とする請求項１〜５のいずれかに記載の方法。6. The method according to claim 1, wherein the tube after the reduction rolling is kept or heated.
工することを特徴とする請求項１〜６のいずれかに記載
の方法。7. The method according to claim 1, wherein the end portion of the strip width is chamfered before the roll forming.
継ぎ溶接する中継溶接機と、帯鋼を蓄えて払い出すルー
パと、帯鋼をオープン管にロール成形するロール成形機
と、オープン管を電縫溶接して管にする電縫溶接装置
と、管を絞り圧延するレデューサとをこの順に配置して
なる電縫鋼管の製造設備列において、前記電縫溶接装置
と前記レデューサの間に、管をビード切削するビード切
削装置と、管を加熱する加熱装置とをこの順に配置した
ことを特徴とする電縫鋼管の製造設備列。8. An uncoiler for dispensing a steel strip, a relay welding machine for relay welding the steel strip, a looper for storing and discharging the steel strip, a roll forming machine for roll-forming the steel strip into an open pipe, and an open pipe. In an ERW steel pipe manufacturing facility line in which an ERW welding apparatus for forming a pipe by ERW welding and a reducer for drawing and rolling the pipe are arranged in this order, between the ERW welding apparatus and the reducer, A row of ERW steel pipe manufacturing equipment, comprising: a bead cutting device for bead cutting a pipe; and a heating device for heating the pipe, arranged in this order.
ビード圧延するビード圧延装置、管をシームアニールす
るシームアニール装置、管をシーム冷却するシーム冷却
装置のうち１種を、または２種以上をこの順に、配置し
たことを特徴とする請求項８記載の設備列。9. A bead rolling device for bead rolling a tube, a seam annealing device for seam annealing a tube, or a seam cooling device for seam cooling a tube between a bead cutting device and a heating device. 9. The equipment line according to claim 8, wherein the above items are arranged in this order.
請求項８または９に記載の設備列。10. The equipment line according to claim 8, wherein an intermediate heating device is provided in the reducer.
熱する熱処理装置を配置したことを特徴とする請求項８
〜１０のいずれかに記載の設備列。11. A heat treatment apparatus for keeping or heating a pipe downstream of the reducer.
An equipment row according to any one of (1) to (10).
部を面取り加工する取り加工装置を配置した請求項８〜
１１のいずれかに記載の設備列。12. A chamfering device for chamfering a width end portion of a steel strip between a looper and a roll forming machine.
An equipment row according to any one of 11 above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000051432A JP4306079B2 (en) | 2000-02-28 | 2000-02-28 | ERW steel pipe manufacturing method and equipment row |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000051432A JP4306079B2 (en) | 2000-02-28 | 2000-02-28 | ERW steel pipe manufacturing method and equipment row |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001239315A true JP2001239315A (en) | 2001-09-04 |
| JP4306079B2 JP4306079B2 (en) | 2009-07-29 |
Family
ID=18573086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000051432A Expired - Fee Related JP4306079B2 (en) | 2000-02-28 | 2000-02-28 | ERW steel pipe manufacturing method and equipment row |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4306079B2 (en) |
Cited By (8)
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|---|---|---|---|---|
| JP2005007452A (en) * | 2003-06-20 | 2005-01-13 | Jfe Steel Kk | Controlling method for temperature of steel tube in equalizer |
| JP2008019480A (en) * | 2006-07-13 | 2008-01-31 | Jfe Steel Kk | Method for manufacturing steel pipe, and facility line for manufacturing steel pipe |
| JP2008526524A (en) * | 2005-01-19 | 2008-07-24 | グローバル チュービング リミテッド ライアビリティー カンパニー | High temperature reduced coiled tubing and formation method thereof |
| WO2012071836A1 (en) * | 2010-11-30 | 2012-06-07 | 大连三高集团有限公司 | Production line of large diameter straight seam welded pipe |
| CN102825437A (en) * | 2012-08-15 | 2012-12-19 | 山东泰丰钢业有限公司 | ERW (electrical resistance welding) process of high-strength automobile transmission shaft pipe |
| CN105834674A (en) * | 2015-01-15 | 2016-08-10 | 宝山钢铁股份有限公司 | Manufacturing method for special diameter sleeve |
| CN106239168A (en) * | 2016-08-01 | 2016-12-21 | 葫芦岛市钢管工业有限公司 | A kind of pre-soldering method of the ERW for LSAW steel pipe's production |
| CN113843301A (en) * | 2017-01-17 | 2021-12-28 | 美国法朗姆能源公司 | Method of manufacturing coiled tubing string |
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2000
- 2000-02-28 JP JP2000051432A patent/JP4306079B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005007452A (en) * | 2003-06-20 | 2005-01-13 | Jfe Steel Kk | Controlling method for temperature of steel tube in equalizer |
| JP2008526524A (en) * | 2005-01-19 | 2008-07-24 | グローバル チュービング リミテッド ライアビリティー カンパニー | High temperature reduced coiled tubing and formation method thereof |
| JP2012051031A (en) * | 2005-01-19 | 2012-03-15 | Dubois Jon D | Method for manufacturing continuous tubing and hot rolling mill |
| JP2008019480A (en) * | 2006-07-13 | 2008-01-31 | Jfe Steel Kk | Method for manufacturing steel pipe, and facility line for manufacturing steel pipe |
| WO2012071836A1 (en) * | 2010-11-30 | 2012-06-07 | 大连三高集团有限公司 | Production line of large diameter straight seam welded pipe |
| CN102825437A (en) * | 2012-08-15 | 2012-12-19 | 山东泰丰钢业有限公司 | ERW (electrical resistance welding) process of high-strength automobile transmission shaft pipe |
| CN105834674A (en) * | 2015-01-15 | 2016-08-10 | 宝山钢铁股份有限公司 | Manufacturing method for special diameter sleeve |
| CN106239168A (en) * | 2016-08-01 | 2016-12-21 | 葫芦岛市钢管工业有限公司 | A kind of pre-soldering method of the ERW for LSAW steel pipe's production |
| CN113843301A (en) * | 2017-01-17 | 2021-12-28 | 美国法朗姆能源公司 | Method of manufacturing coiled tubing string |
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