JP2001269712A - Metallic clad tube and its manufacturing method - Google Patents

Metallic clad tube and its manufacturing method

Info

Publication number
JP2001269712A
JP2001269712A JP2000090268A JP2000090268A JP2001269712A JP 2001269712 A JP2001269712 A JP 2001269712A JP 2000090268 A JP2000090268 A JP 2000090268A JP 2000090268 A JP2000090268 A JP 2000090268A JP 2001269712 A JP2001269712 A JP 2001269712A
Authority
JP
Japan
Prior art keywords
tube
pipe
metal
welded
welding
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.)
Granted
Application number
JP2000090268A
Other languages
Japanese (ja)
Other versions
JP3821628B2 (en
Inventor
Kazuhiro Kinoshita
和宏 木下
Shoichi Maruyama
正一 丸山
Akihiko Kusano
昭彦 草野
Hidehiko Matsumoto
秀彦 松本
Original Assignee
Nippon Steel Corp
新日本製鐵株式会社
Kyushu Refract Co Ltd
九州耐火煉瓦株式会社
Mory Industries Inc
モリ工業株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp, 新日本製鐵株式会社, Kyushu Refract Co Ltd, 九州耐火煉瓦株式会社, Mory Industries Inc, モリ工業株式会社 filed Critical Nippon Steel Corp
Priority to JP2000090268A priority Critical patent/JP3821628B2/en
Publication of JP2001269712A publication Critical patent/JP2001269712A/en
Application granted granted Critical
Publication of JP3821628B2 publication Critical patent/JP3821628B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive clad tube and its manufacturing method in a metallic clad tube, the external tube and internal tube of which are composed of different kinds of metals and its manufacturing method. SOLUTION: In the clad tube consisting of the external tube 1 and internal tube 2 of which are composed of different kinds of metals and brought into close contact, the external tube 1 consists of titanium or titanium alloy, the external tube 1 and the internal tube 2 respectively have weld zones 3 and 4 parallel to the longitudinal direction of the tubes and the metallographic structure of respective base material parts of the external tube 1 and internal tube 2 is as-rolled or annealed structure. By this method for manufacturing the metallic clad tube, the internal tube 2 is formed by forming a metallic strip 6 into a cylindrical shape and welding its joint part and, next, the external tube 1 is formed by forming a metallic strip 5 into a cylindrical shape along the external size of the internal tube 2 and welding its joint part. After forming the internal tube 2, the internal tube 2 is cooled and, next, the external tube 1 is formed by forming the metallic strip 5 into a cylindrical shape along the external size of the internal tube 2 and welding its joint part.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【発明の属する技術分野】本発明は、異種金属によって
構成される外管と内管とが密接してなる金属二重管及び
その製造方法に関するものであり、特に外管をチタン又
はチタン合金で構成し、内管を強度保持のための金属で
構成した表面耐食性の優れた金属二重管に関するもので
ある。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal double pipe in which an outer pipe and an inner pipe made of dissimilar metals are in close contact with each other, and a method of manufacturing the same. The present invention relates to a metal double pipe having excellent surface corrosion resistance in which the inner pipe is made of metal for maintaining strength.
【0002】[0002]
【従来の技術】道路の両側に設置される転落防止柵や侵
入防止柵、建物の周囲に設置されるフェンス等において
は、その構成部材として金属管が用いられることが多
い。これらの柵やフェンスは屋外に設置されるため、耐
食性を要求される。
2. Description of the Related Art Metal pipes are often used as components of fall prevention fences and intrusion prevention fences installed on both sides of a road, fences installed around a building, and the like. Since these fences and fences are installed outdoors, they are required to have corrosion resistance.
【0003】金属管として安価な鉄製の管を用い、その
表面に防食用の塗装を施す。さらに耐食性を重視する場
合は鉄製の管の表面を亜鉛メッキし、その上に表面塗装
が実施されている。しかし、海岸近くの腐食しやすい環
境に設置される場合においては、亜鉛を厚メッキして対
応しているが、メッキの付着性の問題から亜鉛のメッキ
量には限界があり、部材の寿命が腐食によって低下する
という問題を有している。
An inexpensive iron pipe is used as a metal pipe, and its surface is coated with anticorrosion paint. If corrosion resistance is to be emphasized, the surface of the iron pipe is galvanized, and the surface is coated thereon. However, when installed in a corrosive environment near the coast, zinc is plated with a thick coating, but the amount of zinc plating is limited due to the problem of plating adhesion, and the life of the members is limited. There is a problem that it is lowered by corrosion.
【0004】金属管としてステンレス鋼製の管を用いた
場合においては、ステンレス鋼は通常の炭素鋼に比較し
て高価であるため、ステンレス鋼製の管を用いたのでは
費用が増大するという問題がある。また、海岸近くの腐
食しやすい環境の中では、ステンレス鋼といえども孔食
により表面に錆が生じるので美観が劣化し、美観を維持
するためのメンテナンス費用がかかるため、問題を完全
に解決するには到らない。
In the case where a stainless steel tube is used as a metal tube, since stainless steel is more expensive than ordinary carbon steel, the use of a stainless steel tube increases the cost. There is. Also, in an easily corrosive environment near the coast, even pitting of stainless steel causes rust on the surface, deteriorating the aesthetic appearance, and requiring maintenance costs to maintain the aesthetic appearance, completely solving the problem. Does not reach.
【0005】異種金属によって構成される外管と内管と
によって金属二重管を構成し、外管にチタンやステンレ
ス鋼等の耐食性の良好な金属を用い、内管に管の強度を
確保するための鉄等の金属を用いる二重管とし、この二
重管を耐食性が要求される部材として使用する方法が知
られている。
[0005] A metal double tube is formed by an outer tube and an inner tube made of dissimilar metals, a metal having good corrosion resistance such as titanium or stainless steel is used for the outer tube, and the inner tube has sufficient tube strength. There is known a method of using a double pipe using a metal such as iron for this purpose, and using the double pipe as a member requiring corrosion resistance.
【0006】あらかじめ内管及び外管を別々に製造し、
その後、外管の内側に内管を装着し、その後冷間加工を
行い密着性を良くして、さらに必要に応じて熱処理を行
って内管と外管との密着部に拡散層を形成し、内管と外
管との一体化を図る方法が知られている。二重管におい
ては内管と外管とが密接していることが必須であり、上
記あらかじめ内管と外管とを別々に製造してその後両者
を装着する方法においては、外管と内管との間の密着性
を得るために冷間加工を行っているのである。特開昭6
3−219555号公報に記載の方法においては、上記
冷間加工として冷間引抜加工を行ない、その後拡散層を
形成して密着させている。特開昭63−165028号
公報に記載の方法においては、内管に外管を挿入して重
ね合せた後、高温に加熱し同時に内管を加圧して拡管
し、内管と外管を緊密に固着している。特開平2−12
1784号公報に記載の方法においては、冷間圧延、脱
脂洗浄、加熱、冷間加工、溶体化処理、冷間抽伸を行な
い、二重クラッド管を成形している。
[0006] The inner pipe and the outer pipe are separately manufactured in advance,
After that, the inner tube is mounted inside the outer tube, then cold worked to improve the adhesion, and further heat treatment is performed as necessary to form a diffusion layer at the contact portion between the inner tube and the outer tube. A method for integrating an inner tube and an outer tube is known. In a double pipe, it is essential that the inner pipe and the outer pipe are in close contact with each other. In the above-mentioned method of manufacturing the inner pipe and the outer pipe separately and then mounting both, the outer pipe and the inner pipe are required. Cold working is carried out in order to obtain the adhesion between them. JP 6
In the method described in Japanese Patent Application Laid-Open No. 3-219555, cold drawing is performed as the cold working, and then a diffusion layer is formed and adhered. In the method described in JP-A-63-165028, after inserting an outer tube into an inner tube and superimposing them, the inner tube and the outer tube are tightly closed by heating to a high temperature and simultaneously pressurizing and expanding the inner tube. It is stuck to. JP-A-2-12
In the method described in Japanese Patent No. 1784, cold rolling, degreasing and washing, heating, cold working, solution treatment, and cold drawing are performed to form a double clad tube.
【0007】予め2種類の金属を接着したクラッド金属
を製造し、このクラッド金属を造管して二重管を製造す
る方法が考えられる。しかし、二重管の一方の材質にチ
タンを用い、他方の材質に他金属(鉄系金属や銅)を用
いる場合、造管時の溶接においてチタンどうしの溶接部
にFeやCuが混入してしまい、溶接部が脆化するため
に健全な溶接管が製造できないという問題がある。特開
昭53−53020号公報に記載の方法においては、帯
板状の芯材の両面に表面板として異質の金属材料例えば
チタン材料を重合固着した複合部材を準備し、この複合
部材を造管し、接合すべき両端面に表面板と同質の金属
材料からなる紐状の端面材を固着し、この端面材を溶接
して複合管を構成する方法が記載されいてる。
[0007] A method of manufacturing a clad metal in which two kinds of metals are bonded in advance and manufacturing the clad metal to form a double pipe can be considered. However, when titanium is used for one material of the double pipe and another metal (iron-based metal or copper) is used for the other material, Fe or Cu is mixed into a welded portion between titanium in welding at the time of pipe making. As a result, there is a problem that a sound welded pipe cannot be manufactured because the welded portion is embrittled. In the method described in JP-A-53-53020, a composite member is prepared by polymerizing and fixing a foreign metal material, for example, a titanium material as a surface plate on both sides of a strip-shaped core material. A method is described in which a string-shaped end member made of a metal material of the same quality as the surface plate is fixed to both end surfaces to be joined, and the end member is welded to form a composite pipe.
【0008】[0008]
【発明が解決しようとする課題】内管と外管とを別々に
製造して両者を装着し縮径や拡管等の冷間加工を行う方
法においては、冷間加工を行うための工程が増え、製造
コストが増大するという問題がある。もちろん、内管と
外管とを別々に製造して両者を装着したのみでは、内管
と外管とが密接せず、二重管として用いることが困難で
ある。
In a method of manufacturing an inner pipe and an outer pipe separately and mounting them to perform cold working such as diameter reduction or expansion, the number of steps for performing cold working increases. However, there is a problem that the manufacturing cost increases. Of course, if the inner tube and the outer tube are manufactured separately and only the two tubes are mounted, the inner tube and the outer tube do not come into close contact with each other, and it is difficult to use the inner tube and the outer tube as a double tube.
【0009】上記特開昭53−53020号公報に記載
の方法においては、製造工程が複雑で製造コストが増大
するとともに、溶接部の端面材は表面材と同材質であ
り、表面材は通常はチタン等の耐食性を得るための材質
であるから、溶接部においては芯材ではなく耐食性材料
のみによって構成することとなる。
In the method described in the above-mentioned Japanese Patent Application Laid-Open No. 53-53020, the manufacturing process is complicated and the manufacturing cost is increased, and the end face material of the welded portion is the same material as the surface material. Since it is a material for obtaining corrosion resistance, such as titanium, the welded portion is made of only a corrosion-resistant material, not a core material.
【0010】本発明は上記課題を解決し、安価な二重管
及びそ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 problems and to provide an inexpensive double tube and a method for manufacturing the same.
【0011】[0011]
【課題を解決するための手段】即ち、本発明の要旨とす
るところは以下の通りである。 (1)異種金属によって構成される外管1と内管2とが
密接してなる金属二重管において、前記外管1はチタン
又はチタン合金よりなり、前記外管1と内管2とはそれ
ぞれ管の長手方向に平行な溶接部(3、4)を有し、外
管1と内管2それぞれの母材部金属組織は圧延まま又は
焼鈍組織であることを特徴とする金属二重管。 (2)溶接部(3、4)の金属組織は溶接時以降加工変
形を受けていない組織であることを特徴とする上記
(1)に記載の金属二重管。 (3)前記外管1と内管2との溶接部(3、4)は、二
重管の周方向で略同一位置に存することを特徴とする上
記(1)又は(2)に記載の金属二重管。 (4)前記外管1の肉厚は、前記内管2の肉厚の50%
以下であることを特徴とする上記(1)乃至(3)のい
ずれかに記載の金属二重管。 (5)前記内管2は鉄、鉄合金又はステンレス鋼よりな
り、前記外管1の溶接部組成におけるFe濃度は不可避
不純物濃度であることを特徴とする上記(1)乃至
(4)のいずれかに記載の金属二重管。 (6)上記(1)乃至(5)のいずれかに記載の金属二
重管の管端部に蓋7をかぶせ、該蓋7は前記外管1を構
成する金属との間で溶接が可能な金属にて構成し、蓋7
と外管1との接触部を溶接してなることを特徴とする金
属二重管。 (7)金属帯6を円筒状に成形しその継目部を溶接して
内管2を形成し、次いで該内管2の外形に沿って金属帯
5を円筒状に成形しその継目部を溶接して外管1を形成
することを特徴とする、上記(1)乃至(5)のいずれ
かに記載の金属二重管の製造方法。 (8)前記内管2を形成した後に該内管2を冷却し、次
いで該内管2の外形に沿って金属帯5を円筒状に成形し
その継目部を溶接して外管1を形成することを特徴とす
る上記(7)に記載の金属二重管の製造方法。 (9)前記外管継目の溶接速度は8m/分以下であるこ
とを特徴とする上記(7)又は(8)に記載の金属二重
管の製造方法。
That is, the gist of the present invention is as follows. (1) In a metal double tube in which an outer tube 1 and an inner tube 2 made of different kinds of metals are in close contact with each other, the outer tube 1 is made of titanium or a titanium alloy, and the outer tube 1 and the inner tube 2 Metal double pipes having welded portions (3, 4) parallel to the longitudinal direction of the pipes, and the metal structures of the base metal portions of the outer pipe 1 and the inner pipe 2 being as-rolled or annealed. . (2) The metal double pipe according to the above (1), wherein the metal structure of the welded portions (3, 4) is a structure that has not been subjected to working deformation since the time of welding. (3) The welded portion (3, 4) between the outer pipe 1 and the inner pipe 2 is located at substantially the same position in the circumferential direction of the double pipe, as described in the above (1) or (2). Metal double tube. (4) The thickness of the outer tube 1 is 50% of the thickness of the inner tube 2
The metal double tube according to any one of the above (1) to (3), wherein: (5) The inner pipe 2 is made of iron, an iron alloy or stainless steel, and the Fe concentration in the welded portion composition of the outer pipe 1 is an unavoidable impurity concentration. A metal double tube according to Crab. (6) A cover 7 is placed on the pipe end of the metal double pipe according to any one of the above (1) to (5), and the cover 7 can be welded to a metal constituting the outer pipe 1. Made of metal and cover 7
A metal double pipe formed by welding a contact portion between the metal pipe and the outer pipe 1. (7) The metal band 6 is formed into a cylindrical shape, and its joint is welded to form the inner tube 2. Next, the metal band 5 is formed into a cylindrical shape along the outer shape of the inner tube 2, and the joint is welded. The method for producing a metal double tube according to any one of the above (1) to (5), wherein the outer tube 1 is formed by performing the following steps. (8) After the inner tube 2 is formed, the inner tube 2 is cooled, and then the metal band 5 is formed into a cylindrical shape along the outer shape of the inner tube 2 and the joint is welded to form the outer tube 1. (7) The method for producing a metal double tube according to the above (7). (9) The method according to (7) or (8), wherein the welding speed of the outer pipe joint is 8 m / min or less.
【0012】本発明においては、金属帯6を円筒状に成
形しその継目部を溶接して内管2を形成し、次いで該内
管2の外形に沿って内管2とは異種金属であるチタンま
たはチタン合金よりなる金属帯(チタン帯)5を円筒状
に成形しその継目部を溶接して外管1を形成することに
より、異種金属によって構成される外管1と内管2とが
密接し、外管1と内管2とはそれぞれ管の長手方向に平
行な溶接部(3、4)を有し、外管1と内管2それぞれ
の母材部金属組織は圧延まま組織である金属二重管を形
成することをその特徴とする。
In the present invention, the metal strip 6 is formed into a cylindrical shape, and its joint is welded to form the inner pipe 2. Then, the inner pipe 2 is made of a dissimilar metal along the outer shape of the inner pipe 2. By forming a metal band (titanium band) 5 made of titanium or a titanium alloy into a cylindrical shape and welding the joint thereof to form the outer tube 1, the outer tube 1 and the inner tube 2 made of dissimilar metals are formed. The outer tube 1 and the inner tube 2 are in close contact with each other and have welds (3, 4) parallel to the longitudinal direction of the tube, respectively. It is characterized by forming a metal double tube.
【0013】内管2の製造においては、最も一般的な溶
接管の製造方法である、金属帯6を内管形成部10にお
いて円筒状に成形し、その継目部を内管溶接部11にお
いて溶接して内管を形成する方法を採用するため、内管
を安価かつ大量に製造することができる。外管1は、前
記内管製造に引き続き、外管形成部13において内管2
の外形に沿って内管2とは異種金属のチタン帯5を円筒
状に成形し、その継目部を外管溶接部14において溶接
して外管1を形成する方法を採用しているので、内管2
を外管成形の型として用いるために結果として内管2と
外管1とが密接して成形がなされ、外管1の継目部を溶
接した結果として内管2と外管1とが密接してなる金属
二重管が形成される。外管製造も上記のように最も一般
的な溶接管の製造方法を応用したものであり、内管製造
と外管(二重管)製造を同一の連続製造工程で同時に行
うことができるので、極めて安価に金属二重管を製造す
ることができる。
In manufacturing the inner pipe 2, the metal strip 6 is formed into a cylindrical shape at the inner pipe forming portion 10 and the joint portion is welded at the inner pipe welding portion 11, which is the most general method for manufacturing a welded pipe. Since the method of forming the inner tube is adopted, the inner tube can be manufactured inexpensively and in large quantities. The outer pipe 1 is formed in the outer pipe forming section 13 following the inner pipe manufacturing.
The outer tube 1 is formed by forming a titanium strip 5 of a metal different from the inner tube 2 into a cylindrical shape along the outer shape of the inner tube 2 and welding the joint at the outer tube welding portion 14. Inner tube 2
As a result, the inner tube 2 and the outer tube 1 are formed in close contact with each other, and as a result of welding the joint portion of the outer tube 1, the inner tube 2 and the outer tube 1 come into close contact. A metallic double tube is formed. As described above, the outer pipe production is also the application of the most common method of producing a welded pipe. Since the production of the inner pipe and the production of the outer pipe (double pipe) can be performed simultaneously in the same continuous production process, The metal double tube can be manufactured at very low cost.
【0014】本発明の金属二重管は以上のように製造さ
れるので、外管1と内管2とは密接してなり、外管1と
内管2とはそれぞれ管の長手方向に平行な溶接部(3、
4)を有する。造管に用いる金属帯としては、圧延まま
ないしは焼鈍した金属帯を用いる。二重管形成後に冷間
加工を行わないので外管1と内管2それぞれの母材部金
属組織は圧延まま又は焼鈍組織であることを特徴とす
る。従来技術にあるように二重管形成後に冷間加工を行
った場合には、縮径加工であれば外管の外表面に冷間引
き抜き組織が形成され、拡管加工であれば内管の内表面
に同じく冷間引き抜き組織が形成されるので、いずれの
場合も外管あるいは内管母材部の金属組織は圧延まま又
は焼鈍組織ではなくなる。なお、母材部金属組織とは、
溶接熱影響部を除く部分の金属組織という意味である。
また、本発明の金属二重管は、造管後に冷間加工を行わ
ないので、外管と内管それぞれの溶接部の金属組織は溶
接時以降加工変形を受けていない組織であることを特徴
とする。また、造管後に焼鈍熱処理も行わないので、外
管と内管それぞれの溶接部の金属組織は溶接時以降熱処
理に基づく変質を受けていないという特徴も有する。
Since the metal double tube of the present invention is manufactured as described above, the outer tube 1 and the inner tube 2 are in close contact with each other, and the outer tube 1 and the inner tube 2 are each parallel to the longitudinal direction of the tube. Welding parts (3,
4). As the metal band used for pipe forming, an as-rolled or annealed metal band is used. Since cold working is not performed after the formation of the double pipe, the metal structure of the base metal portion of each of the outer pipe 1 and the inner pipe 2 is characterized by being as rolled or annealed. When cold working is performed after forming a double pipe as in the prior art, a cold drawing structure is formed on the outer surface of the outer pipe in the case of diameter reduction processing, and the inner drawing of the inner pipe is performed in the case of expanding processing. Since a cold drawn structure is also formed on the surface, the metal structure of the outer tube or the inner tube base material is no longer a rolled or annealed structure in any case. The base metal structure is
It means the metal structure of the part excluding the weld heat affected zone.
Further, since the metal double pipe of the present invention does not perform cold working after pipe forming, the metal structure of the welded portion of each of the outer tube and the inner tube is a structure that has not undergone work deformation since the time of welding. And Further, since the annealing heat treatment is not performed after the pipe making, the metal structure of the welded portion of each of the outer pipe and the inner pipe has a feature that it has not undergone any alteration due to the heat treatment after the welding.
【0015】[0015]
【発明の実施の形態】本発明の金属二重管の断面を図1
に示し、本発明の金属二重管の製造方法の概念図を図2
に示す。
FIG. 1 is a sectional view of a metal double tube according to the present invention.
FIG. 2 shows a conceptual diagram of the method for manufacturing a metal double tube of the present invention in FIG.
Shown in
【0016】本発明においては、内管形成部10におい
て金属帯6を円筒状に成形し、その継目部を内管溶接部
11において溶接して内管2を形成したあと、該内管を
所定の長さに切断することをせず、連続的に外管形成部
13において該内管2の外形に沿って内管2とは異種金
属のチタン帯5を円筒状に成形し、その継目部を外管溶
接部14において溶接して外管1を形成する方法を採用
している。内管造管後に該内管を切断し、その後外管を
形成したのでは、外管製造時の内管の供給が不連続にな
り、生産性の高い十分に低コストの製造を行うことがで
きなくなる。
In the present invention, the metal band 6 is formed into a cylindrical shape at the inner tube forming portion 10 and the joint portion is welded at the inner tube welding portion 11 to form the inner tube 2. The titanium strip 5 of a metal different from that of the inner tube 2 is continuously formed in the outer tube forming portion 13 along the outer shape of the inner tube 2 without cutting the outer tube forming portion 13 into a cylindrical shape. At the outer tube welding portion 14 to form the outer tube 1. If the inner pipe is cut after the inner pipe is formed, and then the outer pipe is formed, the supply of the inner pipe at the time of manufacturing the outer pipe becomes discontinuous, so that it is possible to perform high-productivity sufficiently low-cost manufacturing. become unable.
【0017】通常の溶接管の製造においては、その製造
工程において金属帯を円筒状に成形した後にその継目部
は円筒の上方に位置している。従って、本発明の金属二
重管においては、内管2の溶接部4も外管1の溶接部3
もともに製造工程において円筒の上方に位置するため、
外管1と内管2との溶接部は、二重管の周方向で略同一
位置に存することとなる。ここで略同一位置とは、図1
(b)において周方向で外管溶接部3と内管溶接部4の
なす角度θは互いに30°以内の範囲に存するという意
味である。二重管の造管装置において、外管の溶接位置
と内管の溶接位置とを反対方向に最大限に傾斜させた場
合においては、上記角度θは60°以内の範囲内まで拡
大可能である。
In the production of ordinary welded pipes, the seam is located above the cylinder after the metal band is formed into a cylinder in the production process. Therefore, in the metal double pipe of the present invention, the welded portion 4 of the inner tube 2 is also replaced by the welded portion 3 of the outer tube 1.
Both are located above the cylinder in the manufacturing process,
The welded portion between the outer tube 1 and the inner tube 2 is located at substantially the same position in the circumferential direction of the double tube. Here, the substantially same position refers to the position shown in FIG.
In (b), the angle θ between the outer pipe weld 3 and the inner pipe weld 4 in the circumferential direction is within a range of 30 ° with each other. In a double-pipe pipe making apparatus, when the welding position of the outer pipe and the welding position of the inner pipe are tilted to the maximum in the opposite direction, the angle θ can be expanded to a range within 60 °. .
【0018】本発明においては、内管製造後にその内管
の外形に沿って外管を形成するので、該外管形成時にお
いて内管は十分な剛性を有するとともに、該内管の剛性
範囲内で外管が形成されることが必要である。そのため
には、内管2の肉厚が厚く、外管1の肉厚が薄い方が好
ましい。本発明においては、外管1の肉厚を内管2の肉
厚の50%以下とすることにより、外管形成時に内管は
十分な剛性を有して型としての役割を果たすことができ
る。本発明の用途において内管2は強度保持部材であっ
て所定の肉厚を必要とし、外管1は耐食性を保持するた
めの部材であって肉厚は薄くて良い。特に外管1として
高価なチタン材料を用いるので、そもそも外管1の肉厚
を薄く設計する。従って、上記のように外管1の肉厚を
内管2の肉厚の50%以下とすることは、本発明の用途
に基づく要請と合致している。
In the present invention, since the outer tube is formed along the outer shape of the inner tube after the inner tube is manufactured, the inner tube has sufficient rigidity at the time of forming the outer tube, and has a rigidity within the range of rigidity of the inner tube. It is necessary for the outer tube to be formed at. For this purpose, it is preferable that the inner tube 2 has a large thickness and the outer tube 1 has a small thickness. In the present invention, by setting the thickness of the outer tube 1 to 50% or less of the thickness of the inner tube 2, the inner tube can have a sufficient rigidity at the time of forming the outer tube and function as a mold. . In the use of the present invention, the inner tube 2 is a strength holding member and requires a predetermined thickness, and the outer tube 1 is a member for maintaining corrosion resistance and may be thin. Particularly, since an expensive titanium material is used for the outer tube 1, the thickness of the outer tube 1 is designed to be thin in the first place. Therefore, as described above, setting the thickness of the outer tube 1 to 50% or less of the thickness of the inner tube 2 is consistent with the requirement based on the use of the present invention.
【0019】内管2が肉厚2mm以上の鉄、鉄合金又は
ステンレス鋼である場合には、外管1の肉厚を1mm以
下とすれば安定した外管の形成が可能である。また、チ
タン又はチタン合金製の外管の肉厚を0.1mm以上と
すると好ましい。外管の肉厚が0.1mm未満の場合に
は、造管時の疵又は二重管を取り扱う際に生じる取り扱
い疵により、外管のチタン又はチタン合金の部分に孔や
割れが発生し、それが二重管の耐食性を著しく低下させ
ることがあるからである。
When the inner tube 2 is made of iron, iron alloy or stainless steel having a thickness of 2 mm or more, a stable outer tube can be formed by making the thickness of the outer tube 1 1 mm or less. It is preferable that the outer tube made of titanium or a titanium alloy has a thickness of 0.1 mm or more. If the thickness of the outer tube is less than 0.1 mm, holes or cracks occur in the titanium or titanium alloy portion of the outer tube due to scratches during pipe making or handling scratches generated when handling the double tube, This is because it may significantly reduce the corrosion resistance of the double pipe.
【0020】厳しい耐食性を要求される用途において、
本発明は外管1をチタン又はチタン合金としているの
で、表面にステンレス鋼を用いた場合に現れる孔食をも
防止することができる。内管2も炭素鋼等にかえてステ
ンレス鋼とすれば、内管の腐食防止効果を向上すること
ができる。
In applications where severe corrosion resistance is required,
In the present invention, since the outer tube 1 is made of titanium or a titanium alloy, pitting corrosion that appears when stainless steel is used on the surface can also be prevented. If the inner tube 2 is made of stainless steel instead of carbon steel or the like, the effect of preventing corrosion of the inner tube can be improved.
【0021】内管2、外管1それぞれの継目部の溶接方
法としては、母材継目部を加熱して鍛接する方法、TI
G溶接法、MIG溶接法、高周波溶接法、シーム溶接
法、ガス溶接法等を採用することができる。外管はチタ
ン又はチタン合金を用いているので、外管溶接には溶接
部の健全性の点からTIG溶接を用いることが最も好ま
しい。
As a method for welding the joints of the inner pipe 2 and the outer pipe 1, a method of forging and joining the joints of the base material by heating them, TI
A G welding method, a MIG welding method, a high frequency welding method, a seam welding method, a gas welding method, or the like can be employed. Since the outer tube uses titanium or a titanium alloy, it is most preferable to use TIG welding for outer tube welding from the viewpoint of the soundness of the welded portion.
【0022】内管溶接後に該溶接部が内管表面より盛り
上がったビードを形成することがある。このビードをバ
イト等を用いた切削手段で切削することにより、その後
形成する外管との密接性をより確実にすることができ
る。
[0022] After welding the inner pipe, the weld may form a bead raised from the surface of the inner pipe. By cutting this bead with a cutting means using a cutting tool or the like, it is possible to further ensure close contact with an outer tube to be formed later.
【0023】外管1をチタン又はチタン合金とし、内管
2を鉄、鉄合金又はステンレス鋼とする本発明において
は、外管継目部のTIG溶接に配慮が必要となる。外管
継目部溶接時に近接する内管2の金属が溶け出し、内管
金属を構成するFe等の成分が溶接部3に混入すると、
該溶接部3が脆くなって溶接不良が発生する。本発明に
おいては、内管2を形成した後に冷却帯12において該
内管を冷却し、次いで外管形成部13において該内管2
の外形に沿って金属(チタン又はチタン合金)帯5を円
筒状に成形し、その継目部を外管溶接部14において溶
接して内管を形成することにより、内管2を構成する金
属が溶け出すことなく外管1の溶接を行うことができ
る。その結果、本発明の金属二重管において外管の溶接
部組成におけるFe濃度は不可避不純物濃度レベルある
いはそれ以下となる。
In the present invention in which the outer tube 1 is made of titanium or a titanium alloy and the inner tube 2 is made of iron, iron alloy or stainless steel, it is necessary to consider the TIG welding of the outer tube joint. When the metal of the inner pipe 2 adjacent to the outer pipe is welded at the time of welding the outer pipe joint, and components such as Fe constituting the inner pipe metal are mixed into the welded portion 3,
The weld 3 becomes brittle and poor welding occurs. In the present invention, after the inner pipe 2 is formed, the inner pipe is cooled in the cooling zone 12, and then the inner pipe 2 is formed in the outer pipe forming portion 13.
The metal (titanium or titanium alloy) band 5 is formed into a cylindrical shape along the outer shape of the above, and the seam portion thereof is welded at the outer tube welding portion 14 to form the inner tube. The outer tube 1 can be welded without melting. As a result, in the metal double pipe of the present invention, the Fe concentration in the composition of the welded portion of the outer pipe is at or below the unavoidable impurity concentration level.
【0024】内管形成後の内管2の冷却においては、該
内管2の温度が700℃以下になるように冷却し、その
後外管1の溶接を行えば、外管溶接部3への内管金属の
溶け出しを防止することができる。造管装置において、
内管溶接部11と外管溶接部14との間に冷却帯12を
設け、該冷却帯12において内管2を強制冷却すること
により、目標とする温度まで内管温度を下げることがで
きる。
In the cooling of the inner pipe 2 after the formation of the inner pipe, the inner pipe 2 is cooled down to a temperature of 700 ° C. or less, and then the outer pipe 1 is welded. Melting of the inner tube metal can be prevented. In the tube making equipment,
By providing a cooling zone 12 between the inner pipe weld 11 and the outer pipe weld 14 and forcibly cooling the inner pipe 2 in the cooling zone 12, the inner pipe temperature can be reduced to a target temperature.
【0025】本発明においては外管1と内管2との接触
面は密接している。密接の程度は、外管1の内面と内管
2の外面との間の間隔が、周方向平均で200μm以下
とすることができる。該外管1の内面と内管2の外面と
の間の間隔は、好ましくは周方向平均で100μm以
下、より好ましくは50μm以下とすることもできる。
In the present invention, the contact surface between the outer tube 1 and the inner tube 2 is in close contact. The degree of close contact can be such that the distance between the inner surface of the outer tube 1 and the outer surface of the inner tube 2 is 200 μm or less on average in the circumferential direction. The distance between the inner surface of the outer tube 1 and the outer surface of the inner tube 2 may be preferably 100 μm or less, more preferably 50 μm or less, in the circumferential average.
【0026】本発明においては、外管溶接部4の溶接速
度を8m/分以下とすると好ましい。8m/分以下であ
れば、溶接部分にかかる瞬間的な熱負荷が軽減し、内管
金属の溶融を防止することができ、溶接部の健全性が向
上するからである。
In the present invention, it is preferable that the welding speed of the outer tube weld 4 is set to 8 m / min or less. If it is 8 m / min or less, the instantaneous heat load applied to the welded portion is reduced, the melting of the inner tube metal can be prevented, and the soundness of the welded portion is improved.
【0027】本発明の金属二重管において、図3、図4
に示すように管端部に蓋7を配置することができる。該
蓋7を金属二重管の外側からかぶせ、蓋の端部と金属二
重管の外管1との接触部を溶接して密封することによ
り、当該管端部において金属二重管の内部と外界雰囲気
との間を遮断することができる。金属二重管の外管がチ
タン又はチタン合金よりなる場合は、蓋7もチタン又は
チタン合金とすることにより、蓋7と外管1との間をT
IG溶接することが可能になる。外管1がチタン又はチ
タン合金であって蓋7を鉄系金属とすると、外管1と蓋
7との間を溶接しようとすると両金属が混合し、健全な
溶接部8を形成することができなくなる。
FIGS. 3 and 4 show the metal double tube of the present invention.
The lid 7 can be arranged at the end of the tube as shown in FIG. The cover 7 is covered from the outside of the metal double tube, and the contact portion between the end of the cover and the outer tube 1 of the metal double tube is welded and sealed, so that the inside of the metal double tube is sealed at the end of the tube. And the outside atmosphere. When the outer tube of the metal double tube is made of titanium or a titanium alloy, the lid 7 is also made of titanium or a titanium alloy, so that T
IG welding can be performed. When the outer tube 1 is made of titanium or a titanium alloy and the lid 7 is made of an iron-based metal, when welding between the outer tube 1 and the lid 7, the two metals are mixed to form a sound weld 8. become unable.
【0028】[0028]
【実施例】表1のNo.1〜14に示す条件を用いて本
発明の金属二重管を製造した。図2に示す連続造管装置
を用いた。外管1の材質はチタン又はチタン合金、内管
2の材質はステンレス鋼又は炭素鋼を用いた。
Embodiment No. 1 in Table 1 The metal double tube of the present invention was manufactured using the conditions shown in Nos. 1 to 14. The continuous tube forming apparatus shown in FIG. 2 was used. The material of the outer tube 1 was titanium or a titanium alloy, and the material of the inner tube 2 was stainless steel or carbon steel.
【0029】[0029]
【表1】 [Table 1]
【0030】まず内管形成部19にて連続する金属帯6
を円筒状に成形し、その継目部を内管溶接部11におい
て高周波溶接又はTIG溶接によって溶接して内管2を
形成し、引き続く5m長さの冷却帯12において内管2
を強制水冷して内管温度を330℃まで低減し、あわせ
てビード切削部15においてバイトを用いてビードの切
削を行った。その後、外管形成部13にて内管2の外形
に沿って連続するチタン帯5を円筒状に成形し、その継
目部を外管溶接部14においてTIG溶接して外管1を
形成した。外管のTIG溶接条件は表1に示す通りであ
る。形成された二重管はその後図示しない切断部におい
て所定の長さに切断した。
First, the continuous metal band 6 is formed in the inner tube forming portion 19.
Is formed into a cylindrical shape, and the joint is welded by high-frequency welding or TIG welding at the inner tube welding portion 11 to form the inner tube 2. Subsequently, the inner tube 2 is formed at the cooling zone 12 having a length of 5 m.
Was subjected to forced water cooling to reduce the inner tube temperature to 330 ° C., and the bead was cut in the bead cutting section 15 using a cutting tool. Thereafter, the titanium strip 5 continuous along the outer shape of the inner pipe 2 was formed into a cylindrical shape in the outer pipe forming section 13, and the outer pipe 1 was formed by TIG welding the joint at the outer pipe welding section 14. The TIG welding conditions for the outer tube are as shown in Table 1. The formed double tube was cut into a predetermined length at a cutting section (not shown).
【0031】内管溶接部4と外管溶接部3との位置関係
は、表1に溶接部角度θとして示した角度だけ周方向に
互いにずれた位置とした。外管1の内面と内管2の外面
との間の間隔は周方向平均50μm以下となった。いず
れの実施例においても、外管の溶接部3への内管材質の
溶け込みは発生せず、良好な溶接部を形成することがで
きた。
The positional relationship between the inner pipe weld 4 and the outer pipe weld 3 was set at positions shifted from each other in the circumferential direction by the angle shown as the weld angle θ in Table 1. The average distance between the inner surface of the outer tube 1 and the outer surface of the inner tube 2 was 50 μm or less in the circumferential direction. In any of the examples, the penetration of the material of the inner tube into the welded portion 3 of the outer tube did not occur, and a good welded portion could be formed.
【0032】内管の材質に炭素鋼を用いた実施例No.
11、12においては、切断した金属二重管の両方の管
端部には、図4に示すような蓋7を設置した。また、気
温が高い地区では、海岸から100m以内の海岸部に設
置する部材については、内管の材質にステンレス鋼を用
いた場合においても同様に管端部に図4に示す蓋7を設
置した。蓋7の材質は純チタンであり、蓋7の端部と外
管との接触部をTIG溶接によって密封して溶接部8と
し、二重管の内部と外部雰囲気との間を遮断した。気温
が高い地区であっても海岸から100m以上離れた地
点、および気温が低い地区に設置する部材については、
内管の材質がステンレス鋼の場合には蓋7を設置せずに
使用した。
Example No. 1 in which carbon steel was used as the material of the inner tube.
In 11 and 12, the lid 7 as shown in FIG. 4 was installed at both ends of the cut metal double tube. Also, in a high temperature area, the lid 7 shown in FIG. 4 was similarly installed at the end of the pipe, even when stainless steel was used as the material of the inner pipe, for members to be installed on the shore within 100 m from the shore. . The material of the lid 7 was pure titanium, and the contact portion between the end of the lid 7 and the outer tube was sealed by TIG welding to form a welded portion 8 to block the inside of the double tube from the outside atmosphere. Regarding members installed in locations where the temperature is 100 m or more away from the coast even in high-temperature areas, and in low-temperature areas,
When the material of the inner tube was stainless steel, it was used without installing the lid 7.
【0033】海岸近くに設置する転落防止柵において上
記金属二重管を使用した。長期間の使用においても金属
二重管の表面腐食は発生せず、またステンレス鋼管に見
られるような表面の孔食も発生しなかった。また、内管
の腐食も発生しなかった。このため、長期間にわたって
転落防止柵の美観を維持することができ、半永久的に使
用を継続することが可能となった。
The metal double tube was used in a fall prevention fence installed near the coast. No surface corrosion of the metal double tube occurred even after long-term use, and no pitting occurred on the surface as seen in stainless steel tubes. Also, no corrosion of the inner tube occurred. For this reason, the beautiful appearance of the fall prevention fence can be maintained for a long period of time, and it has become possible to continue using it semipermanently.
【0034】[0034]
【発明の効果】本発明においては、金属帯を円筒状に成
形しその継目部を溶接して内管を形成し、次いで該内管
の外形に沿って内管とは異種金属の金属帯を円筒状に成
形しその継目部を溶接して外管を形成することにより、
異種金属によって構成される外管と内管とが密接し、外
管と内管とはそれぞれ管の長手方向に平行な溶接部を有
し、外管と内管それぞれの母材部金属組織は圧延まま又
は焼鈍組織である金属二重管を形成することができる。
その結果、従来のように冷間圧延によって外管と内管と
を密着する工程が不要になり、安価に金属二重管を製造
することが可能になった。
According to the present invention, a metal band is formed into a cylindrical shape and its joint is welded to form an inner tube. Then, a metal band of a metal different from the inner tube is formed along the outer shape of the inner tube. By forming it into a cylindrical shape and welding its joints to form an outer tube,
The outer tube and the inner tube made of dissimilar metals are in close contact with each other, and the outer tube and the inner tube each have a welded portion parallel to the longitudinal direction of the tube. It is possible to form a metal double tube having an as-rolled or annealed structure.
As a result, the step of bringing the outer tube and the inner tube into close contact with each other by cold rolling as in the related art is not required, and a metal double tube can be manufactured at low cost.
【0035】その結果、内管によって機械的強度を保持
し、更に外管としてチタン等の耐食性に優れた金属管を
配置することにより、海岸付近において使用しても腐食
が発生せず表面の美観が長期に保たれる金属二重管を極
めて安価に提供することが可能になった。
As a result, by maintaining the mechanical strength by the inner tube and arranging a metal tube having excellent corrosion resistance, such as titanium, as the outer tube, even when used near the coast, no corrosion occurs and the appearance of the surface is improved. It has become possible to provide a metal double tube that can be kept for a long time at extremely low cost.
【0036】本発明の金属二重管の管端部に蓋をかぶ
せ、該蓋は前記外管を構成する金属との間で溶接が可能
な金属にて構成し、蓋と外管との接触部を溶接した金属
二重管により、二重管内部と外界雰囲気との間を遮断
し、内管の腐食を防止することが可能になった。
A cover is placed on the end of the metal double tube of the present invention, and the cover is made of a metal that can be welded to the metal constituting the outer tube. The metal double pipe with the welded part cuts off the inside of the double pipe and the outside atmosphere, thereby preventing corrosion of the inner pipe.
【図面の簡単な説明】[Brief description of the drawings]
【図1】本発明の金属二重管の断面図である。FIG. 1 is a sectional view of a metal double pipe of the present invention.
【図2】本発明の金属二重管の製造方法を示す概念図で
ある。
FIG. 2 is a conceptual diagram illustrating a method for manufacturing a metal double tube according to the present invention.
【図3】管端部に蓋を装着した本発明の金属二重管の部
分断面図である。
FIG. 3 is a partial cross-sectional view of the metal double pipe of the present invention having a lid attached to the pipe end.
【図4】管端部に蓋を装着した本発明の金属二重管の部
分断面図である。
FIG. 4 is a partial cross-sectional view of the metal double pipe of the present invention having a lid attached to the pipe end.
【符号の説明】[Explanation of symbols]
1 外管 2 内管 3、4 溶接部 5 金属帯(チタン帯) 6 金属帯 7 蓋 8 溶接部 10 内管形成部 11 内管溶接部 12 冷却帯 13 外管形成部 14 外管溶接部 15 ビード切削部 Reference Signs List 1 outer tube 2 inner tube 3, 4 welded portion 5 metal band (titanium band) 6 metal band 7 lid 8 welded portion 10 inner tube forming portion 11 inner tube welded portion 12 cooling zone 13 outer tube formed portion 14 outer tube welded portion 15 Bead cutting part
フロントページの続き (72)発明者 木下 和宏 東京都千代田区大手町2−6−3 新日本 製鐵株式会社内 (72)発明者 丸山 正一 東京都千代田区大手町2−6−3 新日本 製鐵株式会社内 (72)発明者 草野 昭彦 東京都中央区八重洲1−9−9 九州耐火 煉瓦株式会社内 (72)発明者 松本 秀彦 大阪府河内長野市楠町東1615番地 モリ工 業株式会社内 Fターム(参考) 4E028 CA02 CA13 4F100 AB01B AB02B AB04B AB12A AB31A AB31B BA02 EC172 EH032 EJ502 JB02 Continuing on the front page (72) Inventor Kazuhiro Kinoshita 2-6-3 Otemachi, Chiyoda-ku, Tokyo Inside Nippon Steel Corporation (72) Inventor Shoichi Maruyama 2-6-3 Otemachi, Chiyoda-ku, Tokyo New Japan Inside Steel Works Co., Ltd. (72) Inventor Akihiko Kusano 1-9-9 Yaesu, Chuo-ku, Tokyo Kyushu Fire Brick Co., Ltd. F term (reference) 4E028 CA02 CA13 4F100 AB01B AB02B AB04B AB12A AB31A AB31B BA02 EC172 EH032 EJ502 JB02

Claims (9)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 異種金属によって構成される外管と内管
    とが密接してなる金属二重管において、前記外管はチタ
    ン又はチタン合金よりなり、前記外管と内管とはそれぞ
    れ管の長手方向に平行な溶接部を有し、外管と内管それ
    ぞれの母材部金属組織は圧延まま又は焼鈍組織であるこ
    とを特徴とする金属二重管。
    1. A metal double pipe in which an outer pipe and an inner pipe made of dissimilar metals are in close contact with each other, wherein the outer pipe is made of titanium or a titanium alloy, and the outer pipe and the inner pipe are each formed of a pipe. A metal double pipe having a welded portion parallel to the longitudinal direction, wherein the base metal microstructure of each of the outer pipe and the inner pipe is as-rolled or annealed.
  2. 【請求項2】 溶接部の金属組織は溶接時以降加工変形
    を受けていない組織であることを特徴とする請求項1に
    記載の金属二重管。
    2. The metal double pipe according to claim 1, wherein the metal structure of the welded portion is a structure that has not been subjected to working deformation since the time of welding.
  3. 【請求項3】 前記外管と内管との溶接部は、二重管の
    周方向で略同一位置に存することを特徴とする請求項1
    又は2に記載の金属二重管。
    3. The welded portion between the outer tube and the inner tube is located at substantially the same position in the circumferential direction of the double tube.
    Or the metal double tube according to 2.
  4. 【請求項4】 前記外管の肉厚は、前記内管の肉厚の5
    0%以下であることを特徴とする請求項1乃至3のいず
    れかに記載の金属二重管。
    4. The thickness of the outer tube is 5 times the thickness of the inner tube.
    The metal double pipe according to any one of claims 1 to 3, wherein the content is 0% or less.
  5. 【請求項5】 前記内管は鉄、鉄合金又はステンレス鋼
    よりなり、前記外管の溶接部組成におけるFe濃度は不
    可避不純物濃度であることを特徴とする請求項1乃至4
    のいずれかに記載の金属二重管。
    5. The inner pipe is made of iron, iron alloy or stainless steel, and the Fe concentration in the welded composition of the outer pipe is an unavoidable impurity concentration.
    The metal double tube according to any one of the above.
  6. 【請求項6】 請求項1乃至5のいずれかに記載の金属
    二重管の管端部に蓋をかぶせ、該蓋は前記外管を構成す
    る金属との間で溶接が可能な金属にて構成し、蓋と外管
    との接触部を溶接してなることを特徴とする金属二重
    管。
    6. The metal double pipe according to any one of claims 1 to 5, wherein the pipe end is covered with a lid, and the lid is made of a metal which can be welded to a metal constituting the outer pipe. A metal double pipe constituted and welded at a contact portion between a lid and an outer pipe.
  7. 【請求項7】 金属帯を円筒状に成形しその継目部を溶
    接して内管を形成し、次いで該内管の外形に沿って金属
    帯を円筒状に成形しその継目部を溶接して外管を形成す
    ることを特徴とする、請求項1乃至5のいずれかに記載
    の金属二重管の製造方法。
    7. A metal band is formed into a cylindrical shape and its joint is welded to form an inner tube, and then the metal band is formed into a cylindrical shape along the outer shape of the inner tube and the joint is welded. The method for producing a metal double pipe according to any one of claims 1 to 5, wherein an outer pipe is formed.
  8. 【請求項8】 前記内管を形成した後に該内管を冷却
    し、次いで該内管の外形に沿って金属帯を円筒状に成形
    しその継目部を溶接して外管を形成することを特徴とす
    る請求項7に記載の金属二重管の製造方法。
    8. Forming the inner tube after cooling the inner tube, forming a metal band into a cylindrical shape along the outer shape of the inner tube, and welding the joint to form an outer tube. The method for producing a metal double pipe according to claim 7, wherein
  9. 【請求項9】 前記外管継目部の溶接速度は8m/分以
    下であることを特徴とする請求項7又は8に記載の金属
    二重管の製造方法。
    9. The method according to claim 7, wherein a welding speed of the outer pipe joint is 8 m / min or less.
JP2000090268A 2000-03-29 2000-03-29 Metal double tube and manufacturing method thereof Expired - Fee Related JP3821628B2 (en)

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Application Number Priority Date Filing Date Title
JP2000090268A JP3821628B2 (en) 2000-03-29 2000-03-29 Metal double tube and manufacturing method thereof

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JP3821628B2 JP3821628B2 (en) 2006-09-13

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102407426A (en) * 2010-09-26 2012-04-11 上海月月潮钢管制造有限公司 Method for manufacturing low alloy steel tube of low-temperature pressure vessel
KR101213084B1 (en) * 2012-09-20 2012-12-18 (주) 디엠에스티에스 Duplex pipe manufacturing apparatus by using rolling
KR101309164B1 (en) * 2013-05-13 2013-09-23 영동주식회사 Manufacturing method of clad pipe
KR101339859B1 (en) * 2012-10-05 2013-12-10 주식회사 한국번디 Apparatus for manufacturing multiple-walled tube and method for manufacturing the same
CN103894441A (en) * 2014-03-20 2014-07-02 宝鸡拓普达钛业有限责任公司 Machining method of TC4 titanium alloy thick-wall tubular product
KR102217605B1 (en) * 2020-09-01 2021-02-19 한두철강 주식회사 Multiple pipe

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102407426A (en) * 2010-09-26 2012-04-11 上海月月潮钢管制造有限公司 Method for manufacturing low alloy steel tube of low-temperature pressure vessel
KR101213084B1 (en) * 2012-09-20 2012-12-18 (주) 디엠에스티에스 Duplex pipe manufacturing apparatus by using rolling
KR101339859B1 (en) * 2012-10-05 2013-12-10 주식회사 한국번디 Apparatus for manufacturing multiple-walled tube and method for manufacturing the same
KR101309164B1 (en) * 2013-05-13 2013-09-23 영동주식회사 Manufacturing method of clad pipe
CN103894441A (en) * 2014-03-20 2014-07-02 宝鸡拓普达钛业有限责任公司 Machining method of TC4 titanium alloy thick-wall tubular product
CN103894441B (en) * 2014-03-20 2016-06-29 宝鸡拓普达钛业有限责任公司 The processing method of TC4 titanium alloy thick-wall pipe material
KR102217605B1 (en) * 2020-09-01 2021-02-19 한두철강 주식회사 Multiple pipe

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