JP5055843B2 - Manufacturing method of electric resistance welded tube with good weld characteristics - Google Patents

Manufacturing method of electric resistance welded tube with good weld characteristics Download PDF

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JP5055843B2
JP5055843B2 JP2006153616A JP2006153616A JP5055843B2 JP 5055843 B2 JP5055843 B2 JP 5055843B2 JP 2006153616 A JP2006153616 A JP 2006153616A JP 2006153616 A JP2006153616 A JP 2006153616A JP 5055843 B2 JP5055843 B2 JP 5055843B2
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一仁 剣持
泰康 横山
能知 岡部
坂田  敬
智弘 井上
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Jfeスチール株式会社
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本発明は、溶接部特性の良好な電縫管の製造方法に関し、特に、油井ラインパイプ向けなどの溶接部の靭性が要求される管あるいは油井のケーシングパイプなどの溶接部強度が要求される管の製造に好ましく用いうる、溶接部特性の良好な電縫管の製造方法に関する。   TECHNICAL FIELD The present invention relates to a method for manufacturing an electric resistance welded tube having good welded portion characteristics, and in particular, a tube that requires toughness of a welded portion such as for oil well line pipes or a tube that requires welded portion strength such as an oil well casing pipe. The present invention relates to a method for manufacturing an electric resistance welded tube that can be preferably used for manufacturing a welded part and has good welded portion characteristics.
通常、管は溶接管と継目無管に大別される。溶接管は、電縫鋼管を例とするように、板(帯材の意。以下同じ)を丸めて端部を突き合わせて溶接して製造し、継目無管は、材料の塊を高温で穿孔しマンドレルミル等で圧延して製造する。溶接管の場合、一般に溶接部の特性は母材より劣ると言われ、管の適用に当たって、用途ごとに溶接部の靭性や強度の保証が常に議論されて問題となってきた。   Usually, pipes are roughly classified into welded pipes and seamless pipes. Welded pipes are manufactured by rolling plates (meaning strips; the same shall apply hereinafter) and welding the ends together, as in the case of ERW steel pipes. It is manufactured by rolling with a mandrel mill or the like. In the case of a welded pipe, it is generally said that the properties of the welded part are inferior to that of the base metal, and in the application of the pipe, guarantees of toughness and strength of the welded part have always been discussed for each application.
例えば、原油や天然ガスなどを輸送するラインパイプでは、管を寒冷地に敷設することが多いため低温靭性が重要であり、また、原油採掘の油井では採掘管を保護するためのケーシングパイプが必要とされ、管の強度が重要視される。
また、通常、管の母材となる熱延板は、管製造後の母材特性を考慮して成分設計や熱処理等が行われて、母材の靭性や強度等の特性は確保される。
For example, in line pipes that transport crude oil, natural gas, etc., low temperature toughness is important because pipes are often laid in cold regions, and casing pipes are required to protect mining pipes in oil wells for crude oil mining. The strength of the tube is regarded as important.
In general, a hot-rolled sheet serving as a base material of a pipe is subjected to component design, heat treatment, and the like in consideration of the base material characteristics after the manufacture of the pipe, and characteristics such as toughness and strength of the base material are ensured.
しかし、溶接部の特性は、母材の成分設計や熱処理等以上に、電縫溶接方法によって大きく左右されるため、溶接技術の開発が重要であった。
電縫溶接の不良原因としては、ペネトレータと呼ばれる溶接板材の端面に生成する酸化物が、電縫溶接時に溶鋼とともに端面から排出されずに残留し、この残留したペネトレータを原因として靭性が低下したり強度不足になる例が多かった。
However, since the characteristics of the welded part are greatly influenced by the electric resistance welding method more than the component design and heat treatment of the base metal, the development of the welding technique has been important.
The reason for the failure of ERW welding is that the oxide generated on the end face of the welded plate material called penetrator remains without being discharged from the end face together with the molten steel during ERW welding, and the toughness decreases due to this residual penetrator. There were many examples of insufficient strength.
そこで、従来技術として電縫溶接不良の主原因であるペネトレータを溶接部から除くため、溶接部の板端面から積極的に溶鋼を排出する技術が鋭意検討されてきた。例えば、特許文献1〜4などに、板端面の形状について検討した例が記載されている。
また、特許文献5には、電縫管の溶接時における板条材の両側縁部の突き合わせ圧力の調整を容易にし、溶接信頼性を高める目的で、板幅端部を種々の形状に面取り加工する旨記載されている。
特開昭57-31485号公報 特開昭63-317212号公報 特開2001-170779号公報 特開2003-164909号公報 特開2001-259733号公報
Therefore, as a conventional technique, in order to remove the penetrator, which is the main cause of ERW welding failure, from the welded portion, a technique for actively discharging molten steel from the plate end surface of the welded portion has been intensively studied. For example, Patent Documents 1 to 4 describe examples of examining the shape of the plate end surface.
Further, in Patent Document 5, the width end of the plate is chamfered into various shapes for the purpose of facilitating the adjustment of the butt pressure of both side edges of the strip material during welding of the ERW pipe and enhancing the welding reliability. It is stated to do.
Japanese Unexamined Patent Publication No. 57-31485 JP 63-317212 A JP 2001-170779 JP 2003-164909 JP 2001-259733 A
特許文献1〜4は、いずれも板端面にテーパを付与して、溶鋼とともにペネトレータを排出することを意図している。テーパを付与する理由は、板端面に容易に形状を与えやすいためと考えられる。しかし、直線あるいは平面状のテーパを与えると、溶鋼排出に伴う酸化物等の欠陥排出には十分でない場合が生じる問題があった。
また、特許文献5には、突き合わせ圧力の調整を容易にする種々の面取り形状が開示されているものの、溶鋼とともにペネトレータを排出する点、およびそれにより溶接部特性(特に低温靭性)を改善する点については、一切記載がないから、そこに開示されている多種多様な面取り形状のうち、いずれの形状が溶接部特性(特に低温靭性)を改善しうるものなのか、全く不明である。
Patent Documents 1 to 4 all intend to give a taper to the plate end surface and discharge the penetrator together with the molten steel. The reason for imparting the taper is considered to be because the shape is easily given to the end face of the plate. However, when a linear or flat taper is provided, there is a problem that it may not be sufficient for the discharge of defects such as oxides accompanying the discharge of molten steel.
Patent Document 5 discloses various chamfering shapes that facilitate adjustment of the butt pressure, but also discharges the penetrator together with the molten steel, and thereby improves the weld properties (particularly low temperature toughness). Is not described at all, it is completely unknown which of the various chamfered shapes disclosed therein can improve the welded portion characteristics (particularly low temperature toughness).
本発明は上述の問題を解決し、溶鋼排出に伴う酸化物等の欠陥排出を十分促進できる、溶接部特性の良好な電縫管の製造方法を提供することを目的とする。   An object of the present invention is to solve the above-mentioned problems and to provide a method for manufacturing an electric resistance welded tube with good welded portion characteristics, which can sufficiently promote the discharge of defects such as oxides accompanying discharge of molten steel.
本発明者らは、前記問題を解決するために鋭意検討し、その結果、次の知見を得た。すなわち、テーパを付与した板端面で、溶接開始時に発生する溶鋼は、接触面積が小さいため少なく、電縫溶接のアプセット(圧接)によって溶接した部分の面積が増加し、これに伴って溶鋼の量は増加してくる。しかし、従来のテーパ形状では、溶鋼の排出角度(排出量)が一定になるため、溶接初期の溶鋼排出は十分であっても、溶接後期の排出は不十分となる場合があって、溶鋼が溢れて板表面で固化して蓋となり、後から溶接面から出ようとする溶鋼を妨害する場合があることを見出した。   The present inventors diligently studied to solve the above problems, and as a result, obtained the following knowledge. In other words, the molten steel generated at the start of welding at the taped end face of the plate is small because the contact area is small, and the area of the welded part increases due to the upset (pressure welding) of ERW welding. Will increase. However, with the conventional taper shape, the discharge angle (discharge amount) of the molten steel is constant, so even if the molten steel discharge at the initial stage of welding is sufficient, the discharge at the latter stage of welding may be insufficient. It was found that it overflowed and solidified on the surface of the plate to become a lid, which could interfere with the molten steel that would later come out of the weld surface.
そこで、本発明者らは溶接の時間経過に伴って、溶鋼が常に良好に排出される方法を鋭意検討した。その結果、溶接初期には溶鋼が少なくて、溶接後期に溶鋼が増加することから、常にほぼ一定の溶鋼を排出する端面形状が必要なことを把握した。種々の形状について検討したところ、板端面にR加工を施すことによって、溶鋼排出を常に良好できることを見出した。   Therefore, the present inventors diligently studied a method in which molten steel is always discharged satisfactorily with the lapse of time of welding. As a result, since there was little molten steel in the early stage of welding and molten steel increased in the latter stage of welding, it was grasped that the end face shape which always discharges about a constant molten steel was needed. As a result of examining various shapes, it has been found that the discharge of molten steel can always be improved by subjecting the plate end surface to R processing.
本発明は、この知見に基づいてなされたもので、その要旨は以下のとおりである。
1. 帯材を成形し、その幅方向両端部を突き合わせて電縫溶接して管とする過程の中で、前記帯材の成形途中に切削または砥石研磨にて帯材幅方向両端部の下面側に帯材内側から外側凸形に張り出すR形状を付与するR加工を施した後に溶接することにより溶接部低温靭性を向上させることを特徴とする、溶接部肉厚中心位置の−46℃での吸収エネルギーが125J以上、脆性破面率が35%以下である溶接部特性の良好なラインパイプ向けまたはケーシングパイプ向け電縫管の製造方法。
The present invention has been made based on this finding, and the gist thereof is as follows.
1. In the process of forming the strip, but joining both ends in the width direction to make a pipe by electro-welding and welding, on the lower surface side of the both ends in the width direction of the strip by cutting or grinding in the middle of forming the strip characterized in that to improve the weld low temperature toughness by welding after performing R processing which imparts the strip inside the R shape protruding convexly outwards, at -46 ° C. weld thickness center position Manufacturing method for ERW pipes for line pipes or casing pipes with good weld properties, with an absorbed energy of 125J or more and a brittle fracture surface ratio of 35% or less.
前記R加工を施すと、溶接初期には時間の経過とともに接触面積が急激に増加するため、溶鋼の排出量が増加し、溶接後期には時間が経過しても接触面積が緩やかに増加するため、溶鋼の排出量は減少する。これらの作用によって、溶鋼排出を安定して行うことができて、溶接面から先に出た溶鋼が固化して蓋となって後から出ようとする溶鋼を妨害するということがなくなるわけである。   When the R process is performed, the contact area increases rapidly with the passage of time in the initial stage of welding, so the discharge amount of molten steel increases, and the contact area gradually increases with the passage of time in the later stage of welding. The amount of molten steel is reduced. By these actions, the molten steel can be discharged stably, and the molten steel that has come out from the welded surface solidifies and becomes a lid that does not interfere with the molten steel that comes out later. .
これらにより、板端部からの溶鋼排出が十分行われてペネトレータを十分除去できる結果、溶接部の靭性や強度などの特性を良好に保持することが可能なわけである。
よって、本発明によれば、電縫溶接時に、溶鋼排出に伴う酸化物等の欠陥排出を十分促進できて、著しく良好な溶接部靭性および溶接強度を得ることができる。
As a result, the molten steel is sufficiently discharged from the end portion of the plate, and the penetrator can be sufficiently removed. As a result, the properties such as the toughness and strength of the welded portion can be satisfactorily maintained.
Therefore, according to the present invention, it is possible to sufficiently promote the discharge of defects such as oxides accompanying discharge of molten steel at the time of ERW welding, and to obtain extremely good weld toughness and weld strength.
図1は、本発明の実施形態の1例を示す造管設備の模式図である。この造管設備では、鋼帯からなる帯材(板)100をアンコイラー1で払い出し、レベラー2で平らに矯正した後、ブレークダウン第1スタンド3を含む初期成形段からフィンパス成形ロール6のスタンドを含む最終成形段にかけてのロール成形機5で、帯材の幅を徐々に丸めて該幅の両端部を突き合わせていく成形を行なう。   FIG. 1 is a schematic diagram of a pipe making facility showing an example of an embodiment of the present invention. In this pipe making equipment, a strip material (plate) 100 made of a steel strip is discharged by an uncoiler 1 and flattened by a leveler 2, and then the stand of the fin pass forming roll 6 is moved from the initial forming stage including the first stand 3 of breakdown. In the roll forming machine 5 to the final forming stage including, the forming is performed by gradually rounding the width of the band material and butting both ends of the width.
次いで、前記幅を丸めた帯材を、その丸めた幅の両端部を誘導加熱手段(例えば誘導加熱コイル)7で誘導加熱しながらスクイズロール8で圧接して、管(電縫溶接管)となす。そして、この管を、その圧接部(溶接部)に生じているビードをビード部切削手段9で切削除去した後、サイザー10で定径圧延し、管切断機11で所定長さに切断する。
この例では、R加工を施す手段として、砥石研磨機4を、ブレークダウン第1スタンド3のすぐ後に配置し、これを用いて図2に示すような実施形態で砥石研磨することにより板幅方向両端部の板厚方向端側にR加工を施すようにしている。砥石研磨機4の代りに切削バイト(図示省略)を用いてもよい。
Next, the strip having the rounded width is pressed with a squeeze roll 8 while induction heating both ends of the rounded width with an induction heating means (for example, an induction heating coil) 7, Eggplant. The bead generated in the pressure contact portion (welded portion) of the tube is removed by cutting with the bead portion cutting means 9, and then fixed-diameter rolled with a sizer 10 and cut into a predetermined length with a tube cutting machine 11.
In this example, as a means for performing R processing, a grindstone polishing machine 4 is disposed immediately after the first breakdown stand 3 and is used to grind the grindstone in the embodiment as shown in FIG. so that performing R processing in the thickness direction lower end side of both ends. A cutting tool (not shown) may be used instead of the grindstone polishing machine 4.
なお、板端部のR加工は板厚方向の片側端部でもよいが、両側に付与すると効果が大きい。
R加工をエッジャーロール等の孔型ロールで行うと、中途半端な塑性加工を板端部が受けるため、所望する形状を得ることが難しいが、切削または砥石研磨で行うことにより、所望する形状をそのまま得ることが可能である。
In addition, although the R process of a board edge part may be the one side edge part of a board thickness direction, if it gives to both sides, an effect will be large.
When the R processing is performed with a hole-type roll such as an edger roll, it is difficult to obtain a desired shape because the plate end receives halfway plastic processing, but the desired shape can be obtained by cutting or grinding with a grindstone. Can be obtained as is.
また、切削または砥石研磨によるR加工は、帯材成形前(ロール成形機5の入側(レべラー2の出側))で行ってもよいが、ロール成形機5内の初期成形段(特にプレークダウン第1スタンド3)で板端部形状が変化するおそれがある。よって、所望する形状をそのまま得る観点からは、切削または砥石研磨によるR加工は、ロール成形機5内の初期成形段(特にプレークダウン第1スタンド3)より下流側で行うことが好ましい。   In addition, the R processing by cutting or grinding by the grinding wheel may be performed before the band material is formed (on the entry side of the roll forming machine 5 (on the exit side of the leveler 2)), but the initial forming stage in the roll forming machine 5 ( In particular, there is a possibility that the shape of the plate end portion changes in the first stand 3). Therefore, from the viewpoint of obtaining a desired shape as it is, it is preferable that the R processing by cutting or grindstone polishing is performed on the downstream side of the initial forming stage (particularly the first stand 3 of the rake down) in the roll forming machine 5.
また、切削または砥石研磨でR加工を施す代りに、フィンパス成形ロール(略してフィン)6を用いたフィンパス成形でR加工を施してもよい。フィンパス成形では、例えば図3に示すように、板100を丸めて断面を円形形状とするため、板端部はフィン6に強圧される。従って、所望するR形状を予めフィン6に与えておくことによって、板端部形状を所望するR形状に十分近づけることが可能となるわけである。   Further, instead of performing R processing by cutting or grinding with a grindstone, R processing may be performed by fin pass forming using a fin pass forming roll (fin for short) 6. In fin pass molding, for example, as shown in FIG. 3, the plate 100 is rounded to have a circular cross section, so that the plate end is strongly pressed by the fins 6. Therefore, by giving the desired R shape to the fins 6 in advance, the plate end shape can be made sufficiently close to the desired R shape.
以下、実施例に基づいて説明する。
一例として、板幅1920mm×板厚19.1mmの鋼帯を帯材に用い、アンコイラー1、レベラー2、ロール成形機5、電縫溶接機(誘導加熱手段7+スクイズロール8)、ビード部切削手段9、サイザー10を図1のように配置してなる造管機で、外径600mmの鋼管を製造した。
Hereinafter, a description will be given based on examples.
As an example, a steel strip having a plate width of 1920 mm and a plate thickness of 19.1 mm is used as a strip, and an uncoiler 1, leveler 2, roll forming machine 5, electric welding machine (induction heating means 7 + squeeze roll 8), bead part cutting means 9 A steel pipe having an outer diameter of 600 mm was manufactured by a pipe making machine in which the sizer 10 was arranged as shown in FIG.
製造した鋼管の溶接部から試験片を切り出してシャルピー試験を行い、性能を評価した。シャルピー試験片は、管長手方向の相違する10点から1本ずつ、試験片長さ方向を管円周方向にとり、ノッチ長さ中心を溶接部肉厚中心位置として採取し、JIS5号の2mmVノッチ衝撃試験片とした。試験片温度−46℃で衝撃試験を行い、吸収エネルギー、脆性破面率を測定した。   A test piece was cut out from the welded portion of the manufactured steel pipe and a Charpy test was performed to evaluate the performance. Each Charpy test piece is taken from 10 points with different pipe longitudinal directions, the specimen length direction is taken in the pipe circumferential direction, the notch length center is taken as the weld thickness center position, and the JIS5 2mmV notch impact is taken. A test piece was obtained. An impact test was conducted at a specimen temperature of -46 ° C., and the absorbed energy and the brittle fracture surface ratio were measured.
なお、吸収エネルギーは125J以上、脆性破面率が35%以下を性能許容範囲とした。
(No.1)本発明例として、上記造管中に、ロール成形機5内のブレークダウン第1スタンド3のすぐ後で、砥石研磨により、板幅方向両端部の下面側(管外面側になる;図2参照)に半径9mmのR加工を付与した。その後、ロール成形を経て、電縫溶接し、サイザー10に通して鋼管を製造した。製造した鋼管の溶接部から試験片を切り出してシャルピー試験を行った。
In addition, the allowable energy performance was 125 J or more and the brittle fracture surface ratio was 35% or less.
(No. 1) As an example of the present invention, during the pipe making, immediately after the breakdown first stand 3 in the roll forming machine 5, grinding is performed on the lower surface side (to the pipe outer surface side) at both ends in the plate width direction. R; see FIG. 2) was given an R process with a radius of 9 mm. After that, through roll forming, electric resistance welding was performed, and the steel pipe was manufactured through the sizer 10. A test piece was cut out from the welded portion of the manufactured steel pipe and a Charpy test was performed.
(No.2)参考例として、上記造管中に、ロール成形におけるフィンパス成形において、フィン6の形状を工夫して、板幅方向両端部の上下両面側に半径5mmのR加工を付与した。その後、電縫溶接し、サイザー10に通して鋼管を製造した。製造した鋼管の溶接部から試験片を切り出してシャルピー試験を行った。
(No.3)比較例として、上記造管中に、ロール成形前であるレベラー加工後において、孔型ロールを用いて、板幅方向両端部の上面側に垂直端面(板幅方向端面)からの角度が30度、テーパ開始点から板表面までの垂直距離が3mmになるほぼ直線状のテーパを付与した。その後、ロール成形し、電縫溶接して、サイザー10に通して鋼管を製造した。製造した鋼管の溶接部から試験片を切り出してシャルピー試験を行った。
(No. 2) As a reference example, in the above-mentioned pipe making, in the fin pass forming in roll forming, the shape of the fin 6 was devised, and R processing with a radius of 5 mm was given to the upper and lower both sides of both ends in the plate width direction. Thereafter, electric welding was performed, and a steel pipe was manufactured by passing through sizer 10. A test piece was cut out from the welded portion of the manufactured steel pipe and a Charpy test was performed.
(No. 3) As a comparative example, after the leveler processing before roll forming during the pipe making, from the vertical end surface (end surface in the plate width direction) on the upper surface side of both ends in the plate width direction, using a perforated roll A substantially linear taper was applied with an angle of 30 degrees and a vertical distance from the taper starting point to the plate surface of 3 mm. Thereafter, the steel sheet was roll-formed, electro-welded, and passed through the sizer 10 to produce a steel pipe. A test piece was cut out from the welded portion of the manufactured steel pipe and a Charpy test was performed.
(No.4)従来例として、鋼帯の板端面をほぼ矩形(R加工なし)として、上記の工程で造管して鋼管を製造した。製造した鋼管の溶接部から試験片を切り出してシャルピー試験を行った。
上記の各例におけるシャルピー試験により、シャルピー衝撃値と脆性破面率を測定した結果を表1に示す。
(No. 4) As a conventional example, a steel pipe was manufactured by making the plate end face of a steel strip into a substantially rectangular shape (without R processing) and pipe-making in the above process. A test piece was cut out from the welded portion of the manufactured steel pipe and a Charpy test was performed.
Table 1 shows the results of measuring the Charpy impact value and the brittle fracture surface ratio by the Charpy test in each of the above examples.
表1より、本発明例(R加工)では、溶接部の衝撃強度が高く脆性破面率が小さくて、靭性が良好であって、製品の信頼性が高い。これに対し、比較例(直線状テーパ加工)では、前記性能許容範囲内にあるものの、溶接部の衝撃強度が低くて脆性破面率が大きい場合があった。また、従来例(矩形端面;Rもテーパもなし)では、靭性が低下しており、製品の信頼性に乏しかった。   From Table 1, in the present invention example (R processing), the impact strength of the welded portion is high, the brittle fracture surface ratio is small, the toughness is good, and the reliability of the product is high. On the other hand, in the comparative example (linear taper processing), although it was within the allowable range of performance, the impact strength of the welded portion was low and the brittle fracture surface ratio was sometimes large. Further, in the conventional example (rectangular end face; neither R nor taper), the toughness is lowered and the reliability of the product is poor.
本発明の実施形態の1例を示す造管設備の模式図である。It is a schematic diagram of the pipe making equipment which shows an example of embodiment of this invention. 砥石研磨によるR加工の実施形態の1例を示す模式図である。It is a schematic diagram which shows one example of embodiment of R process by grindstone grinding | polishing. フィンパス成形によるR加工の実施形態の1例を示す模式図である。It is a schematic diagram which shows an example of embodiment of R process by fin pass shaping | molding.
符号の説明Explanation of symbols
1 アンコイラー
2 レベラー
3 ブレークダウン第1スタンド
4 砥石研磨機
5 ロール成形機
6 フィンパス成形ロール(フィン)
7 誘導加熱手段
8 スクイズロール
9 ビード部切削手段
10 サイザー
11 管切断機
100 帯材(板)
DESCRIPTION OF SYMBOLS 1 Uncoiler 2 Leveler 3 Breakdown 1st stand 4 Grinding wheel polisher 5 Roll forming machine 6 Fin pass forming roll (fin)
7 Induction heating means 8 Squeeze roll 9 Bead section cutting means
10 Sizer
11 Pipe cutting machine
100 strip (plate)

Claims (1)

  1. 帯材を成形し、その幅方向両端部を突き合わせて電縫溶接して管とする過程の中で、前記帯材の成形途中に切削または砥石研磨にて帯材幅方向両端部の下面側に帯材内側から外側凸形に張り出すR形状を付与するR加工を施した後に溶接することにより溶接部低温靭性を向上させることを特徴とする、溶接部肉厚中心位置の−46℃での吸収エネルギーが125J以上、脆性破面率が35%以下である溶接部特性の良好なラインパイプ向けまたはケーシングパイプ向け電縫管の製造方法。 In the process of forming the strip, but joining both ends in the width direction to make a pipe by electro-welding and welding, on the lower surface side of the both ends in the width direction of the strip by cutting or grinding in the middle of forming the strip characterized in that to improve the weld low temperature toughness by welding after performing R processing which imparts the strip inside the R shape protruding convexly outwards, at -46 ° C. weld thickness center position Manufacturing method for ERW pipes for line pipes or casing pipes with good weld properties, with an absorbed energy of 125J or more and a brittle fracture surface ratio of 35% or less.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111002171A (en) * 2019-12-25 2020-04-14 深圳市领域精密制造有限公司 Stainless steel corrugated pipe machining device

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* Cited by examiner, † Cited by third party
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JPH0368740A (en) * 1989-08-03 1991-03-25 Kobe Steel Ltd Thick and small-diameter electric welded steel tube having uniform width of white layer and production thereof
JPH04105709A (en) * 1990-08-22 1992-04-07 Kobe Steel Ltd Manufacture of resistance welded tube
JP2867790B2 (en) * 1992-03-27 1999-03-10 住友金属工業株式会社 Fin pass roll and welded pipe manufacturing equipment
JP3402550B2 (en) * 1996-01-30 2003-05-06 日産自動車株式会社 Groove for welded joint
JP3712797B2 (en) * 1996-09-03 2005-11-02 バブコック日立株式会社 Welded structure of ferritic heat resistant steel pipe
JPH10277639A (en) * 1997-04-09 1998-10-20 Kawasaki Steel Corp Manufacture of steel tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111002171A (en) * 2019-12-25 2020-04-14 深圳市领域精密制造有限公司 Stainless steel corrugated pipe machining device

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