JP3342953B2 - Manufacturing method of ERW steel pipe - Google Patents
Manufacturing method of ERW steel pipeInfo
- Publication number
- JP3342953B2 JP3342953B2 JP11806694A JP11806694A JP3342953B2 JP 3342953 B2 JP3342953 B2 JP 3342953B2 JP 11806694 A JP11806694 A JP 11806694A JP 11806694 A JP11806694 A JP 11806694A JP 3342953 B2 JP3342953 B2 JP 3342953B2
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- buckling
- roll
- manufacturing
- electric resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Heat Treatment Of Articles (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電縫鋼管の製造方法に
係り、特に大径薄肉の電縫鋼管をフィンパス成形する際
にエッジ近傍で外面側に発生する小さなくぼみを改善す
るのに好適な電縫鋼管の製造方法に関する。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 more particularly to a method for improving a small hollow formed on an outer surface near an edge when a large diameter thin wall electric resistance welded steel pipe is formed by fin pass forming. The present invention relates to a method for manufacturing a highly electric-resistance welded steel pipe.
【０００２】[0002]
【従来の技術】従来、大径電縫鋼管を製造する場合は、
たとえば図３に示すようなプロセスで行われるのが一般
的である。すなわち、帯板１をブレークダウンロール
２、エッジフォーミングロール３、アウトサイドケージ
ロール４、インサイドケージロール５で逐次円筒形状に
成形した後、仕上成形ロールであるフィンパスロール６
で所定の寸法のオープンパイプ１Ａに仕上成形する。そ
の後、溶接機７で溶接してからスクイズロール８によっ
て両エッジを圧着して素管１Ｂとした後、熱処理装置９
によってその溶接シーム部Ｗに熱処理を施し、さらにサ
イザ10で所定の外径に仕上げて製品とするのである。2. Description of the Related Art Conventionally, when manufacturing a large-diameter ERW steel pipe,
For example, it is generally performed by a process as shown in FIG. That is, after the strip 1 is sequentially formed into a cylindrical shape by the breakdown roll 2, the edge forming roll 3, the outside cage roll 4, and the inside cage roll 5, the fin pass roll 6, which is a finish forming roll, is formed.
To form an open pipe 1A having a predetermined size. Then, after welding with a welding machine 7, both edges are pressure-bonded by a squeeze roll 8 to obtain a raw tube 1B.
The heat treatment is applied to the welded seam portion W, and the finished product is finished to a predetermined outer diameter by the sizer 10.
【０００３】ところで、ｔ／Ｄ（ｔ；肉厚、Ｄ；外径）
の小さい大径薄肉の電縫鋼管をフィンパスロール６で成
形する際には、往々にしてエッジ近傍の外面側に、図４
に示すような深さｄであるくぼみ状の欠陥（以下、座屈
と称する）11が発生する。この座屈11が発生するとエッ
ジウエーブを引き起こし、溶接部形状を損なうため品
質、歩留りに悪影響を及ぼすことになる。By the way, t / D (t: thickness, D: outer diameter)
When a large-diameter thin-walled electric resistance welded steel pipe having a small diameter is formed by the fin pass roll 6, the outer surface near the edge is often placed on the outer surface side as shown in FIG.
A dent-like defect (hereinafter referred to as buckling) 11 having a depth d as shown in FIG. When this buckling 11 occurs, an edge wave is caused and the shape of the welded portion is impaired, which adversely affects the quality and yield.
【０００４】このような座屈11の発生を防止する方策と
しては、たとえば特開昭57−149016号公報に開示されて
いるように、フィンパスリダクションを管長手方向のエ
ッジウエーブが生じない極限まで低減する方法がある。As a measure for preventing the occurrence of such buckling 11, for example, as disclosed in Japanese Patent Application Laid-Open No. Sho 57-149016, the fin path reduction is performed to the limit where the edge wave does not occur in the longitudinal direction of the pipe. There are ways to reduce it.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記し
た特開昭57−149016号の従来法では、最良の成形条件を
選択したとしても座屈を完全に無くすことができないと
いう欠点がある。すなわち、本発明者らが400N材と590N
材を用いてｔ／Ｄを種々変えて実験した結果、図５に示
すように、590N材の場合はｔ／Ｄが1.3 ％以下におい
て、また400N材の場合はｔ／Ｄが1.1 ％以下において、
深さｄが0.1 mm以上の座屈11が発生することが判明した
のである。However, the conventional method disclosed in Japanese Patent Application Laid-Open No. 57-149016 has a disadvantage that buckling cannot be completely eliminated even if the best molding conditions are selected. That is, the present inventors, 400N material and 590N
As shown in FIG. 5, the t / D was 1.3% or less for the 590N material, and the t / D was 1.1% or less for the 400N material, as shown in FIG. ,
It has been found that buckling 11 having a depth d of 0.1 mm or more occurs.
【０００６】本発明は、上記のような従来技術の有する
課題を解決したものであって、最終製品において座屈の
ない電縫鋼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 problems of the prior art as described above, and an object of the present invention is to provide a method for manufacturing an electric resistance welded steel pipe without buckling in a final product.
【０００７】[0007]
【課題を解決するための手段】本発明は、大径薄肉の電
縫鋼管を製造する際に、成形溶接後の溶接シーム部の熱
処理工程において、エッジ近傍に発生した座屈部位が含
まれる領域をＡc3変態点直上の温度に加熱し、その後直
ちに該領域に0.05〜0.25％の軽い圧下を加えることによ
り、上記目的を達成したものである。SUMMARY OF THE INVENTION The present invention relates to a method for manufacturing a large-diameter thin-walled electric resistance welded steel pipe, which comprises a step of heat-treating a welded seam portion after forming welding, the region including a buckling portion generated near an edge. Was heated to a temperature just above the Ac 3 transformation point, and immediately thereafter, a slight reduction of 0.05 to 0.25% was applied to the region to achieve the above object.
【０００８】[0008]
【作 用】本発明によれば、エッジ近傍に発生した座屈
部位が含まれる領域をＡC3変態点直上の温度に加熱した
後直ちに該領域に圧下を加えるようにしたので、座屈を
完全に無くすことができる。なお、加熱温度をＡC3変態
点直上にした理由は、通常の鋼板の場合のオーステナイ
ト化による軟化温度はＡC3変態点以上とされており、こ
のＡC3変態点において高温変形抵抗が急激に下がるのに
着目したものである。なお、ＡC3変態点より高温まで加
熱するとオーステナイト粒が粗大化し脆くなるので、そ
の上限は熱処理装置の温度制御の精度を勘案して、実用
上せいぜい＋50℃程度とするのがよい。According to the present invention, a region including a buckling portion generated near an edge is heated to a temperature immediately above the A C3 transformation point, and immediately after that, a pressure is applied to the region. Can be eliminated. The reason why the heating temperature was just above A C3 transformation point, softening temperature by austenitizing in the case of ordinary steel plate is the A C3 transformation point or higher, it drops abruptly high temperature deformation resistance in the A C3 transformation point It is a thing which paid attention to. Note that heating to a temperature higher than the A C3 transformation point causes austenite grains to become coarse and brittle, so the upper limit is preferably at most about + 50 ° C. in consideration of the accuracy of temperature control of the heat treatment apparatus.
【０００９】[0009]
【実施例】以下に、本発明の実施例について、図面を参
照して詳しく説明する。図１は、本発明の実施に用いる
電縫鋼管製造ラインを示す概要図であって、従来例との
相違点は上下一対のカリバロールからなる圧下装置12を
熱処理装置９とサイザ10との間に配置したことである。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic view showing an electric resistance welded steel pipe production line used for carrying out the present invention. The difference from the conventional example is that a pressing device 12 composed of a pair of upper and lower caliber rolls is provided between a heat treatment device 9 and a sizer 10. It is that it was arranged.
【００１０】この図１に示されるように、帯板１はブレ
ークダウンロール２、エッジフォーミングロール３、ア
ウトサイドケージロール４、インサイドケージロール５
で逐次円筒形状に成形され、フィンパスロール６で所定
の寸法のオープンパイプ１Ａに仕上成形され、溶接機７
で溶接された後スクイズロール８によって両エッジが圧
着されて素管１Ｂとされる。As shown in FIG. 1, the strip 1 comprises a breakdown roll 2, an edge forming roll 3, an outside cage roll 4, and an inside cage roll 5.
Is sequentially formed into a cylindrical shape, and is finally formed into an open pipe 1A having a predetermined size by a fin pass roll 6, and the welding machine 7
After welding, both edges are pressed by the squeeze roll 8 to form the raw tube 1B.
【００１１】そして、その後素管１Ｂの溶接シーム部Ｗ
が熱処理装置９で熱処理されるのであるが、この熱処理
工程において、スクイズロール７の圧接によって生じた
オープンパイプ１Ａのエッジ近傍の座屈部位を完全にカ
バーし得る領域にわたって、ＡC3変態点直上の温度で加
熱する。このとき、溶接シーム部Ｗ近傍は加熱によって
ピーキングと称するたて長の状態になる。Then, the welded seam portion W of the raw tube 1B is thereafter formed.
Is subjected to heat treatment in the heat treatment device 9. In this heat treatment step, the buckling portion near the edge of the open pipe 1 </ b> A caused by the pressure contact of the squeeze roll 7 can be completely covered, and the area immediately above the A C3 transformation point Heat at temperature. At this time, the vicinity of the weld seam portion W is in a long state called peaking due to heating.
【００１２】ついで、加熱後直ちに、図２に示すよう
に、そのたて長の加熱領域Ｒを圧下装置12のカリバロー
ル12ａ，12ｂを用いて圧下を加え、溶接シーム部Ｗ近傍
を再成形する。この圧下の度合いはたとえば0.05〜0.25
％のような軽い範囲にするのが適当である。外径Ｄが60
9.4 mmφで肉厚ｔが6.4 mm（ｔ／Ｄ＝1.05％）でAPI X6
0 規格の大径薄肉電縫鋼管を製造する際に、溶接シーム
部Ｗを中心にした30mmの範囲を920℃で熱処理した後、
直ちにカリバロールで３mmの圧下を付加したところ、表
面に座屈のない極めて滑らかな電縫鋼管を製造すること
ができた。これによって、たとえば590N材のようなハイ
グレード材においても座屈を完全に無くすことができ
る。Immediately after the heating, as shown in FIG. 2, the vertical heating region R is rolled down by using the caliber rolls 12a and 12b of the rolling down device 12, and the vicinity of the weld seam portion W is reformed. The degree of this reduction is, for example, 0.05 to 0.25
It is appropriate to use a light range such as%. Outer diameter D is 60
API X6 with 9.4 mmφ and thickness t of 6.4 mm (t / D = 1.05%)
When manufacturing a large-diameter thin-walled electric resistance welded steel tube of 0 standard, after heat-treating a range of 30 mm around the weld seam W at 920 ° C,
Immediately after applying a 3 mm reduction with caliberol, an extremely smooth ERW pipe without buckling on the surface could be manufactured. This makes it possible to completely eliminate buckling even in a high-grade material such as 590N.
【００１３】[0013]
【発明の効果】以上説明したように、本発明によれば、
成形溶接後の熱処理工程でエッジ近傍に発生した座屈部
位が含まれる領域をＡC3変態点直上の温度で完全に加熱
し、その直後に圧下するようにしたので、ｔ／Ｄの大小
のいかんにかかわらず、表面が極めて滑らかな電縫鋼管
を製造することができ、製品の品質や歩留りの向上に寄
与する。As described above, according to the present invention,
Since the region including the buckled portion generated near the edge in the heat treatment process after forming welding was completely heated at a temperature just above the A C3 transformation point, and immediately after that, the pressure was reduced. Irrespective of this, an electric resistance welded steel pipe having an extremely smooth surface can be manufactured, which contributes to improvement of product quality and yield.
【図１】本発明の実施に用いる電縫鋼管製造ラインを示
す概要図である。FIG. 1 is a schematic diagram showing an electric resistance welded steel pipe production line used for carrying out the present invention.
【図２】圧下装置の作用を示す正面図である。FIG. 2 is a front view showing the operation of the screw-down device.
【図３】電縫鋼管製造ラインの従来例を示す概要図であ
る。FIG. 3 is a schematic view showing a conventional example of an electric resistance welded steel pipe production line.
【図４】座屈発生現象の説明図である。FIG. 4 is an explanatory diagram of a buckling occurrence phenomenon.
【図５】ｔ／Ｄと座屈の深さの関係の一例を示す特性図
である。FIG. 5 is a characteristic diagram showing an example of a relationship between t / D and buckling depth.
１ 帯板 １Ａ オープンパイプ １Ｂ 素管 ６ フィンパスロール ７ スクイズロール ８ 溶接機 ９ 熱処理装置 10 サイザ 11 くぼみ（座屈） 12 圧下装置 12ａ，12ｂ カリバロール Ｗ 溶接シーム部 DESCRIPTION OF SYMBOLS 1 Strip 1A Open pipe 1B Raw pipe 6 Fin pass roll 7 Squeeze roll 8 Welding machine 9 Heat treatment device 10 Sizer 11 Indentation (buckling) 12 Rolling-down device 12a, 12b Cariba roll W Weld seam
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B21D 3/00 B21C 37/08 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 7 , DB name) B21D 3/00 B21C 37/08
Claims (1)
形溶接後の溶接シーム部の熱処理工程において、エッジ
近傍に発生した座屈部位が含まれる領域をＡc3変態点直
上の温度に加熱し、その後直ちに該領域に0.05〜0.25％
の軽い圧下を加えることを特徴とする電縫鋼管の製造方
法。When a large-diameter thin-walled ERW pipe is manufactured, in a heat treatment step of a welded seam portion after forming welding, a region including a buckling portion generated near an edge is defined as a temperature just above the Ac 3 transformation point. And then immediately in the area 0.05-0.25%
A method for producing an electric resistance welded steel pipe, characterized by applying a slight reduction in pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11806694A JP3342953B2 (en) | 1994-05-31 | 1994-05-31 | Manufacturing method of ERW steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11806694A JP3342953B2 (en) | 1994-05-31 | 1994-05-31 | Manufacturing method of ERW steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07323333A JPH07323333A (en) | 1995-12-12 |
| JP3342953B2 true JP3342953B2 (en) | 2002-11-11 |
Family
ID=14727170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11806694A Expired - Fee Related JP3342953B2 (en) | 1994-05-31 | 1994-05-31 | Manufacturing method of ERW steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3342953B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055515C (en) * | 1996-02-28 | 2000-08-16 | 崔国利 | Regeneration technology for oil-field gun perforator barrel |
| CN108517398B (en) * | 2018-06-26 | 2023-10-27 | 安徽马钢设备检修有限公司 | Post-welding heat treatment device for large-pipe-diameter thin-wall pipe and use method thereof |
-
1994
- 1994-05-31 JP JP11806694A patent/JP3342953B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07323333A (en) | 1995-12-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |