JPH0566210B2 - - Google Patents
Info
- Publication number
- JPH0566210B2 JPH0566210B2 JP62181665A JP18166587A JPH0566210B2 JP H0566210 B2 JPH0566210 B2 JP H0566210B2 JP 62181665 A JP62181665 A JP 62181665A JP 18166587 A JP18166587 A JP 18166587A JP H0566210 B2 JPH0566210 B2 JP H0566210B2
- Authority
- JP
- Japan
- Prior art keywords
- tube
- inner tube
- pipe
- double
- outer diameter
- 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 - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 238000005260 corrosion Methods 0.000 claims description 16
- 230000007797 corrosion Effects 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 13
- 239000010935 stainless steel Substances 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 2
- 239000010962 carbon steel Substances 0.000 claims description 2
- 238000010622 cold drawing Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
Landscapes
- Metal Extraction Processes (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は配管用、熱交換用、油井用、構造用な
どに用いられる耐食二重管の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing corrosion-resistant double pipes used for piping, heat exchange, oil wells, structures, etc.
鋼管はその形状から種々の用途、例えば物体の
搬送、熱交換、あるいは構造体などとして用いら
れているが、そのため鋼管に要求される特性も
様々であり、時代の推移と共に多様化、高級化し
ている。
Due to their shape, steel pipes are used for a variety of purposes, such as transporting objects, exchanging heat, and as structures. Therefore, the characteristics required of steel pipes also vary, and with the passage of time they have become more diverse and sophisticated. There is.
例えば油井用鋼管の場合は、深井戸化にともな
い腐食環境も厳しくなり、強度とともに高耐食性
が要求されるようになつている。しかし、この両
特性を満足させるためには非常に高価な材料を使
用せざるを得なくなり、そのため鋼管の製造コス
トは非常に高いものとなる。このコスト上昇を抑
制するために、異つた材質を組合せた多層管の製
造方法が種々提案されている。 For example, in the case of steel pipes for oil wells, as wells become deeper, the corrosive environment becomes more severe, and both strength and high corrosion resistance are required. However, in order to satisfy both of these characteristics, it is necessary to use very expensive materials, and therefore the manufacturing cost of the steel pipe becomes very high. In order to suppress this cost increase, various methods for manufacturing multilayer pipes that combine different materials have been proposed.
例えば特開昭58−107225号公報に開示されてい
るように外管を加熱膨脹し内管内に水を流して内
外管の温度差を制御した後、水圧により内管を拡
管し内外管を一体とした後外管の熱収縮により二
重管を製造する方法があり、また、本発明者が特
開昭59−218215公報に開示したように、複数の金
属管の層間に線条体を挿入し、冷間引抜き（以下
冷牽という）法等によつて金属多層管を製造する
方法などがある。 For example, as disclosed in Japanese Patent Application Laid-Open No. 58-107225, after heating and expanding the outer tube and flowing water into the inner tube to control the temperature difference between the inner and outer tubes, the inner tube is expanded by water pressure to integrate the inner and outer tubes. There is a method of manufacturing a double tube by heat-shrinking the outer tube after forming a metal tube, and as disclosed by the present inventor in Japanese Patent Application Laid-Open No. 59-218215, a method of manufacturing a double tube by inserting a filament between the layers of a plurality of metal tubes is known. However, there is a method of manufacturing a metal multilayer pipe by a cold drawing method (hereinafter referred to as cold drawing).
従来の二重管製造方法のうち、特開昭58−
107225号公報などの所謂焼きバメ法では設備費が
高く、労働生産性が悪いという問題が有り結果的
に製造コストが高くなる。
Among the conventional double pipe manufacturing methods, JP-A-58-
The so-called shrink fit method as disclosed in Publication No. 107225 has the problems of high equipment costs and poor labor productivity, resulting in high manufacturing costs.
また、冷牽法は比較的安価な二重管の製造方法
であるが、耐食性の優れた二重管を製造する上で
幾つかの問題がある。 Further, although the cold drawing method is a relatively inexpensive method for manufacturing double-walled pipes, there are several problems in manufacturing double-walled pipes with excellent corrosion resistance.
管内面に腐食性の流体を流す耐食二重管の場合
は、ステンレス鋼、チタニウムなどの非鉄金属の
耐食性材料が内管として用いられるが、これら内
管は高価であるため外管に較べ薄肉管を用いるの
が一般的であり、外管は目的強度を満足する鋼管
を用いるのが一般的である。 In the case of corrosion-resistant double pipes that allow corrosive fluid to flow through the inner surface of the pipe, corrosion-resistant materials such as stainless steel and titanium are used for the inner pipes, but these inner pipes are expensive, so they are thinner than the outer pipes. It is common to use a steel pipe that satisfies the target strength for the outer pipe.
一端を絞り加工（以下先付け加工という）され
た外管に内管を挿入し冷牽すると、内管はダイス
のテーパー部で生じる噛込み反力によつて押戻さ
れ二重管に成らないことから、外管に内管を挿入
し両者一緒に先付け加工してから冷牽するが、こ
の先付け部分は商品とならないため切り捨てられ
ることから、高価な内管の歩留が低下するという
問題がある。また、内管は肉厚２mm以下、肉厚・
外径比（肉厚÷外径×100）がおよそ３％以下の
薄肉管である場合が多いことから、冷牽によつて
外管内面に均一に密着せず周方向に座屈する場合
があり、このような場合は全く商品と成らないと
いう問題がある。 When an inner tube is inserted into an outer tube whose one end has been drawn (hereinafter referred to as tip-drawing) and cold drawn, the inner tube will be pushed back by the biting reaction force generated at the tapered part of the die and will not become a double tube. Then, the inner tube is inserted into the outer tube and both are pre-attached and then cold drawn. However, this pre-applied part is not sold as a product and is discarded, which causes the problem of lower yields of the expensive inner tube. . In addition, the inner tube has a wall thickness of 2 mm or less,
Since the tube is often thin-walled with an outer diameter ratio (wall thickness ÷ outer diameter x 100) of approximately 3% or less, it may not adhere uniformly to the inner surface of the outer tube and buckle in the circumferential direction due to cold stretching. , In such a case, there is a problem that the product cannot be considered as a product at all.
本発明は上記問題点を排除した内管の歩留ロス
のない、かつ、内管の座屈の発生しない耐食二重
管を安価で確実に製造する方法を提供することを
目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide a method for inexpensively and reliably manufacturing a corrosion-resistant double-pipe tube that eliminates the above-mentioned problems and does not cause yield loss or buckling of the inner tube.
本発明は上述の問題点を有利に解決するもので
あり、その主旨は、外管が炭素鋼管、内管がステ
ンレス鋼あるいはチタニウムから成る耐食性二重
管の製造において、一端を絞り加工された外素管
に内管を挿入し、ダイスを介して冷牽加工する際
に、内管外径絞り率を0.5〜5.0％とすることを特
徴とする耐食二重管の製造方法である。
The present invention advantageously solves the above-mentioned problems, and its main purpose is to manufacture a corrosion-resistant double tube in which the outer tube is made of carbon steel and the inner tube is made of stainless steel or titanium. This is a method for producing a corrosion-resistant double-walled pipe, which is characterized in that the inner pipe is inserted into the raw pipe and subjected to cold drafting through a die, and the reduction ratio of the outer diameter of the inner pipe is set to 0.5 to 5.0%.
ここで、ステンレス鋼とは、JIS Ｇ 3463（ボ
イラー・熱交換器用ステンレス鋼鋼管）に規定さ
れる、鋼種をいう。 Here, stainless steel refers to a steel type specified in JIS G 3463 (stainless steel pipes for boilers and heat exchangers).
以下本発明を図面に示す実施態様例に基づき詳
細に説明する。
The present invention will be described in detail below based on embodiment examples shown in the drawings.
第１図は冷牽法により耐食二重管を製造する方
法を説明する図である。 FIG. 1 is a diagram illustrating a method of manufacturing a corrosion-resistant double pipe by a cold drawing method.
先付けされた外管１に外径を特定された耐食性
材料の内管２を挿入し、図には示さない引抜機で
外管１の先付け部分をチヤツキングしてダイス３
を介して引抜くことにより、外管１と内管２が全
面均一に密着した耐食二重管４が製造される。 The inner tube 2 made of a corrosion-resistant material with a specified outer diameter is inserted into the outer tube 1 that has been attached at the beginning, and the tip attached portion of the outer tube 1 is chucked with a drawing machine (not shown) to form the die 3.
By pulling the tube through the tube, a corrosion-resistant double tube 4 in which the outer tube 1 and the inner tube 2 are uniformly adhered to each other over the entire surface is manufactured.
このとき外管１はダイス３を通過する際に縮径
され、内管２も縮径される外管１によつて縮径さ
れるが、内管１の外径は次に示す(1)式によつて求
められる内管外径絞り率が0.5〜5.0％の範囲に入
るように特定されていることが必要である。 At this time, the diameter of the outer tube 1 is reduced as it passes through the die 3, and the inner tube 2 is also reduced in diameter by the outer tube 1. The outer diameter of the inner tube 1 is as shown below (1). It is necessary that the drawing ratio of the inner tube outer diameter determined by the formula is specified to fall within the range of 0.5 to 5.0%.
内径外径絞り率＝Ｄ−（ｄ−2t）／Ｄ×100（％）
……(1)
ここでＤ：引抜き前の内管の外径
ｄ：ダイスの孔径
ｔ：外管１の肉厚
内管外径絞り率が５％を超えると、上述の如く
内管はダイスのテーパー部で生じる噛込み反力に
よつて押戻され二重管にならなく、また、この対
策として外管と一体先付け加工しても肉厚÷外径
×100が３％以下の内管では周方向に座屈する場
合があり、さらに、内管外径絞り率が0.5％未満
になると外管の肉厚バラツキによつては外管と内
管の全面均一密着が得られ難くなる。Inner/outer diameter drawing ratio = D - (d - 2t) / D x 100 (%) ... (1) where D: Outer diameter of the inner tube before drawing d: Hole diameter of the die t: Wall thickness of the outer tube 1 If the inner tube outer diameter reduction ratio exceeds 5%, the inner tube will be pushed back by the biting reaction force generated at the tapered part of the die and will not become a double tube. Even with integral pre-fitting, inner tubes with wall thickness ÷ outer diameter x 100 of 3% or less may buckle in the circumferential direction, and furthermore, if the inner tube outer diameter reduction ratio is less than 0.5%, the outer tube wall thickness may vary. In some cases, it becomes difficult to achieve uniform contact between the outer tube and the inner tube over the entire surface.
実施例 １
比較のための従来法
外管 JIS G3454 STPG38 90A
スケジユール20（外径101.6mm、肉厚4.5mm）
内管 JIS G3459 SUS304TP 89.1mm、肉厚2.1mm
ダイス 孔径 89.1mm
内管外径絞り率＝10.1％
以上の組合せで冷牽法により二重管を製造したと
ころ、外管のみ先付加工した場合は内管は押戻さ
れ、外管のみが冷牽されて二重管とはならないた
め、外管と内管を一体で先付け加工して冷牽し
た。
Example 1 Conventional outer pipe for comparison JIS G3454 STPG38 90A Schedule 20 (outer diameter 101.6 mm, wall thickness 4.5 mm) Inner pipe JIS G3459 SUS304TP 89.1 mm, wall thickness 2.1 mm Die Hole diameter 89.1 mm Inner pipe outer diameter drawing ratio = 10.1% When a double pipe was manufactured using the cold drawing method using the above combination, if only the outer pipe was tipped, the inner pipe would be pushed back and only the outer pipe would be cold drawn, so it would not become a double pipe. The outer and inner tubes were pre-assembled as one piece and cold drawn.
本発明法
外管 JIS G3454 STPG38 90A
スケジユール20 （外径101.6mm、肉厚4.5mm）
内管 JIS G3459 SUS304TP 外径83.5mm、肉
厚2.0mmお
ダイス 孔径 89.1mm
内管外径絞り率＝4.1％
以上の組合せで外管のみ先付け加工し、外管に内
管を挿入し冷牽によつて二重管を製造したとこ
ろ、内管と外管は密着一体化した二重管が得られ
た。 Invention tube JIS G3454 STPG38 90A Schedule 20 (outer diameter 101.6 mm, wall thickness 4.5 mm) Inner tube JIS G3459 SUS304TP Outer diameter 83.5 mm, wall thickness 2.0 mm die Hole diameter 89.1 mm Inner tube outside diameter drawing ratio = 4.1% Using the above combination, only the outer tube was pre-attached, the inner tube was inserted into the outer tube, and a double tube was manufactured by cold drawing. A double tube was obtained in which the inner tube and the outer tube were closely integrated.
実施例 ２
比較のための従来法
外管 JIS G3454 STPG38 90A
スケジユール20（外径101.6mm、肉厚4.5mm）
内管 JIS H4630 TTP35W 外径89.1mm、肉厚
1.5mm
ダイス 孔径 89.1mm
内管外径絞り率＝10.1％
以上の組合せで冷牽法により二重管を製造したと
ころ、外管のみ先付加工した場合は内管は押戻さ
れ、外管のみが冷牽されて二重管とはならなかつ
た。また、外管と内管を一体で先付け加工して冷
牽した場合は、内管が周方向に座屈して管内面側
に折込み商品とはならなかつた。Example 2 Conventional outer pipe for comparison JIS G3454 STPG38 90A Schedule 20 (outer diameter 101.6 mm, wall thickness 4.5 mm) Inner pipe JIS H4630 TTP35W outer diameter 89.1 mm, wall thickness
1.5mm die hole diameter 89.1mm Inner tube outer diameter reduction ratio = 10.1% When a double tube was manufactured using the cold drawing method using the above combinations, when only the outer tube was tipped, the inner tube was pushed back and only the outer tube However, it was not possible to form a double pipe due to the cold pulling. In addition, when the outer tube and the inner tube were pre-assembled as one piece and cold-drawn, the inner tube buckled in the circumferential direction and folded toward the inner surface of the tube, preventing the product from being a product.
本発明法
外管 JIS G3454 STPG38 90A
スケジユール20 （外径101.6mm、肉厚4.5mm）
内管 JIS H4630 TTP35W 外径82.5mm、肉厚
1.5mm
ダイス 孔径 89.1mm
内管外径絞り率＝2.9％
以上の組合せで外管のみ先付け加工し、外管に内
管を挿入し冷牽によつて二重管を製造したとこ
ろ、内管と外管は密着一体化した二重管が得られ
た。 Invention tube JIS G3454 STPG38 90A Schedule 20 (outer diameter 101.6 mm, wall thickness 4.5 mm) Inner tube JIS H4630 TTP35W outer diameter 82.5 mm, wall thickness
1.5mm die hole diameter 89.1mm Inner tube outer diameter reduction ratio = 2.9% Only the outer tube was assembled in advance, the inner tube was inserted into the outer tube, and a double tube was manufactured by cold drawing. A double tube with a tightly integrated outer tube was obtained.
実施例 ３
外管 JIS G3461 STB35 外径60.3mm、肉厚4.0
mm
内管 JIS G4630 TTP35W 外径43.2mm、肉厚
0.45mm
ダイス 孔径 50.8mm
内管外径絞り率＝0.9％
以上本発明法の組合せで外管のみ先付け加工
し、外管に内管を挿入し冷牽によつて二重管を製
造したところ、内管が肉厚＝0.45mm、肉厚÷外径
×100＝1.0％という薄肉管であるにもかかわら
ず、内管と外管が密着一体化した二重管が得られ
た。Example 3 Outer tube JIS G3461 STB35 Outer diameter 60.3mm, wall thickness 4.0
mm Inner tube JIS G4630 TTP35W Outer diameter 43.2mm, wall thickness
0.45mm die Hole diameter 50.8mm Inner tube outer diameter Reduction rate = 0.9% By combining the above methods of the present invention, only the outer tube was pre-processed, the inner tube was inserted into the outer tube, and a double tube was manufactured by cold drawing. Even though the inner tube was thin with a wall thickness of 0.45 mm and a wall thickness divided by outer diameter x 100 = 1.0%, a double tube was obtained in which the inner tube and outer tube were tightly integrated.
以上述べたように本発明法によれば、ステンレ
ス鋼、チタニウムなどの耐食性材料の薄肉管を内
管とし密着一体化した耐食二重管を高価な内管の
歩留ロスなしに、かつ、肉厚÷外径×100が３％
以下の薄肉管でも座屈することなしに有利に製造
することができる顕著な効果を示す。
As described above, according to the method of the present invention, a corrosion-resistant double tube with a thin-walled inner tube made of a corrosion-resistant material such as stainless steel or titanium and closely integrated can be produced without loss of yield of the expensive inner tube, and Thickness ÷ outer diameter x 100 = 3%
It shows a remarkable effect that even the following thin-walled tubes can be advantageously manufactured without buckling.
第１図は本発明の二重管の製造方法を説明する
図である。
１……外管、２……内管、３……ダイス、４…
…耐食二重管。
FIG. 1 is a diagram illustrating the method for manufacturing a double pipe according to the present invention. 1...Outer tube, 2...Inner tube, 3...Dice, 4...
...Corrosion-resistant double tube.
Claims (1)
いはチタニウムから成る耐食性二重管の製造にお
いて、一端を絞り加工した前記の外管に前記内管
を挿入し、ダイスを介して冷間引き抜き加工する
際に、内管外径絞り率を0.5〜5.0％とすることを
特徴とする耐食二重管の製造方法。1. In manufacturing a corrosion-resistant double-pipe tube in which the outer tube is made of carbon steel and the inner tube is made of stainless steel or titanium, the inner tube is inserted into the outer tube which has been drawn at one end, and cold drawn through a die. A method for manufacturing a corrosion-resistant double pipe, characterized in that the reduction ratio of the inner pipe outside diameter is 0.5 to 5.0%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18166587A JPS6427716A (en) | 1987-07-21 | 1987-07-21 | Manufacture of corrosion resistant duplex tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18166587A JPS6427716A (en) | 1987-07-21 | 1987-07-21 | Manufacture of corrosion resistant duplex tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6427716A JPS6427716A (en) | 1989-01-30 |
| JPH0566210B2 true JPH0566210B2 (en) | 1993-09-21 |
Family
ID=16104727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18166587A Granted JPS6427716A (en) | 1987-07-21 | 1987-07-21 | Manufacture of corrosion resistant duplex tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6427716A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0459141A (en) * | 1990-06-27 | 1992-02-26 | Shinsei:Kk | Manufacture of double tube |
| JP5796516B2 (en) * | 2011-03-03 | 2015-10-21 | 新日鐵住金株式会社 | Metal double pipe manufacturing method |
| CN102303065B (en) * | 2011-06-21 | 2013-08-28 | 攀钢集团成都钢钒有限公司 | Method for manufacturing seamless steel tube for vehicle-mounted large-diameter high pressure gas cylinder |
| DE102015122297A1 (en) * | 2015-12-18 | 2017-06-22 | Sandvik Materials Technology Deutschland Gmbh | Method for producing a high-pressure pipe |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5111030A (en) * | 1974-07-18 | 1976-01-28 | Matsumoto Yushi Seiyaku Kk | BOSHOKUZAI |
| JPS5113745A (en) * | 1974-06-13 | 1976-02-03 | Atlantic Richfield Co | |
| JPS5196760A (en) * | 1975-02-21 | 1976-08-25 | Fukugokanzaino kakohoho |
-
1987
- 1987-07-21 JP JP18166587A patent/JPS6427716A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5113745A (en) * | 1974-06-13 | 1976-02-03 | Atlantic Richfield Co | |
| JPS5111030A (en) * | 1974-07-18 | 1976-01-28 | Matsumoto Yushi Seiyaku Kk | BOSHOKUZAI |
| JPS5196760A (en) * | 1975-02-21 | 1976-08-25 | Fukugokanzaino kakohoho |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6427716A (en) | 1989-01-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |