JP3413455B2 - Pipe manufacturing method - Google Patents
Pipe manufacturing methodInfo
- Publication number
- JP3413455B2 JP3413455B2 JP2000062478A JP2000062478A JP3413455B2 JP 3413455 B2 JP3413455 B2 JP 3413455B2 JP 2000062478 A JP2000062478 A JP 2000062478A JP 2000062478 A JP2000062478 A JP 2000062478A JP 3413455 B2 JP3413455 B2 JP 3413455B2
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- joint
- joining
- hardness
- friction
- 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
- Pressure Welding/Diffusion-Bonding (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、パイプの製造方法
に関するものである。
【０００２】
【従来の技術】原子力発電関連プラント、火力発電関連
プラント、化学プラント等においては、その配管路形成
に最適な材料からなる金属管が使用されている。複数種
類の押通流体が分岐あるいは合流すること等に基づい
て、同一配管系統の途中で配管構成材の金属材料を使い
分ける必要があり、かつ、配管の途中に金属材料の相連
する継手を設置することが要求される場合には、各構成
材料からなる金属管の継手部分にフランジ継手構造を採
用することが有力である。
【０００３】
【発明が解決しようとする課題】しかし、流体の気密性
を重要視する配音路等においては、フランジ接続構造よ
りも、例えばステンレス鋼管とチタン合金管とを直接突
き合わせ溶接した構造とした方が望ましいが、この溶接
継手は、異材金属聞溶接となるために、その実施に技術
的な困難性を伴うものとなる。つまり、ステンレス鋼と
チタン合金との直接溶接や固相接合であると、両金属の
接合箇所に、硬度が高く伸びの少ないＴｉ一Ｃ相が形成
されるため、機械的強度が著しく低下するものとなる。
【０００４】本発明は上記事情に鑑みて提案されたもの
で、ステンレス鋼と各異種金属とによる継手形成を容易
にすること、継手部分の硬度上昇を抑制して伸びを大き
くし機械的強度を確保すること等を目的とするものであ
る。
【０００５】
【課題を解決するための手段】上記目的を達成するた
め、ステンレス鋼材と異種金属材とを接合したパイプの
製造方法において、ステンレス鋼材の被接合面を脱炭処
理する工程と、該脱炭処理したステンレス鋼材の被接合
面と異種金属材の被接合面とを摩擦圧接する工程と、ス
テンレス鋼材及び異種金属材を摩擦圧接した複合材料の
接合強度が小さい中心部に穴を空ける工程とを有するパ
イプの製造方法としている。
【０００６】
【作用】ステンレス鋼材の被接合面を脱炭処理し炭素量
を低減した状態で、異種金属材を摩擦圧接すると、ステ
ンレス鋼材からの炭素原子の移行量が少なくなって、炭
素化合物の生成が抑制され、かつ摩擦時に披接合面に凹
凸等が形成されて接合が緊密になって接合強度が高くな
る。また、炭素化合物の生成量が少なくなることによっ
て、硬度上昇が少なくかつ伸びが大きくなる。
【０００７】
【発明の実施の形態】以下、本発明に係るパイプの製造
方法の一実施例について、図１ないし図３を参照して説
明する。該一実施例にあっては、丸棒状をなすステンレ
ス鋼材１とＴｉ−５Ｔａ材２との継手形成を行なうもの
である。
【０００８】「ステンレス鋼材の披接合面の脱炭処理」
図１に示すように、ステンレス鋼材１の被接合面１ａの
近傍について脱炭処理を行ない、ステンレス銅１が本来
有している炭素量を低減して脱炭相１ｂを形成してお
く。
【０００９】「両被接合面の平滑化処理」ステンレス鋼
材１及び異種金属材（Ｔｉ−５Ｔａ材）２における両被
接合面１ａ・２ａについて、研磨加工等を実施して平滑
化を行なっておく。
【００１０】「摩擦接合」これら脱炭処理及び平滑化処
理を施したステンレス鋼材１及び異種金属材２につい
て、図１に示すように、例えばステンレス鋼材１を矢印
のように回転させた状態で、異種金属材２を矢印で示す
ように直線的に移動させて圧接し、摩擦接合を行なう。
披接合面１ａの脱炭処理後に、被接合面２ａとの間で摩
擦圧接を実行すると、被接合面１ａの近傍組織の炭素量
が低減されていることに基づいて、接合部分への炭素原
子の移行量が少なくなり、したがって、Ｔｉ−Ｃ化合物
の生成が抑制される。
【００１１】「摩擦接合状態」摩擦圧接時に、両被接合
面１ａ・２ａが擦られるとともに、脱炭処理に基づく硬
度の低下によって、両披接合面１ａ・２ａに、微小な凹
凸や擦傷等が比較的容易に形成される。そして、摩擦接
合が両被接合面１ａ・２ａのほぼ全域で均一に行なわれ
るものとなり、摩擦接合強度が高められる。
【００１２】＜硬度の改善例＞図２は、ステンレス鋼材
とＴｉ−５Ｔａ材との摩擦接合箇所Ｓの硬度の改善例を
示している。つまり、図２は、ステンレス鋼材の硬度が
Ｌａ（例えばＨｖ２００）であるものと、Ｔｉ−５Ｔａ
材の硬度がＬｍ〈例えばＨｖ１５０）であるものとを摩
擦接合する場合において、脱炭相の硬度が破線Ｌｂで示
すように低下する。これを使用して摩擦接合を実施する
と、摩擦接合箇所Ｓの硬度がＬｓ（Ｈｖ３００程度）と
なることを示している。また、図３は、脱炭処理を行な
わずに摩擦接合をした例を示しており、摩擦接合箇所に
おけるＦｅ−Ｔｉ相ｔ及びＴｉ−Ｃ相ｕの硬度がＬｕ
（Ｈｖ４００〜４５０）となることを示している。
【００１３】＜伸びの計測例＞図２（本発明の実施例）
と図３（比較例）との摩擦接合箇所の伸びを計測したと
ころ、前者は５％を越えたが、後者は２％程度であっ
た。
【００１４】「異材継手を有するパイプの作製」図１の
鎖線で示すように、ステンレス鋼材１及びＴｉ−５Ｔａ
材２を摩擦接合した複合材料（複合丸棒）は、ステンレ
ス鋼材１を矢印で示すように回転させて一体化している
ために、周速度が低くなる中心部の接合強度が小さくな
る傾向があるが、パイプを作製する場合には、摩擦接合
の終了後に中心部分に穴３を明けて除去すると、接合強
度が十分となる部分のみを利用することができる。
【００１５】＜他の実施態様＞本発明にあっては、次の
技術を包含するものである。
（１）ステンレス鋼に接合される異種金属材が、純Ｔ
ａ、Ｎｂ、Ｚｒ等のＴｉ−５Ｔａ材以外であること。
（２）摩擦接合時の回転対象材を任意とすること、つま
り、相対回転状態とすること。
【００１６】
【発明の効果】以上説明したように、本発明に係るパイ
プの製造方法によれば、ステンレス鋼材の被接合面を脱
炭処理しておいて、脱炭処理したステンレス鋼材の被接
合面と異種金属材の被接合面とを摩擦圧接することによ
って、継手を形成するものであるから、下記のような効
果を奏する。
（１）金属問炭素化合物が生成され易い異種金属継手に
あっても、ステンレス鋼と各異種金属とによる継手形成
を容易に実施することができる。
（２）脱炭処理によって被接合面の炭素量を予め低減し
ておくことによって、継手部分の硬度上昇を抑制して伸
びを大きくし、複合材の機械的強度を確保することがで
きる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a pipe . [0002] In a nuclear power plant, a thermal power plant, a chemical plant, and the like, a metal pipe made of a material most suitable for forming a pipe is used. It is necessary to use different metallic materials for piping components in the same piping system based on branching or merging of multiple types of pushing fluids, and to install joints of metal materials in the middle of piping. When this is required, it is effective to adopt a flange joint structure for the joint portion of the metal pipe made of each constituent material. [0003] However, in a sound distribution path or the like in which the airtightness of a fluid is regarded as important, a structure in which, for example, a stainless steel pipe and a titanium alloy pipe are directly butt-welded rather than a flange connection structure is used. Although it is more preferable, since this welded joint is a dissimilar metal welding, there is a technical difficulty in performing the welding. In other words, when direct welding or solid-phase welding of stainless steel and a titanium alloy is performed, a Ti—C phase having high hardness and low elongation is formed at a joint between the two metals, so that mechanical strength is significantly reduced. Becomes [0004] The present invention has been proposed in view of the above circumstances, to facilitate the formation of a joint between stainless steel and each dissimilar metal, to suppress the rise in hardness of the joint portion, to increase the elongation and to increase the mechanical strength. The purpose is to secure them. In order to achieve the above object, a pipe made of a stainless steel material and a dissimilar metal material is used.
In the manufacturing method, the steps of decarburizing processing joining surface of the stainless steel, the step of friction welding the joining surface of the joining surface of the stainless steel material with a dehydration charcoal treatment and different metal materials, scan
Of composite materials friction welded of stainless steel and dissimilar metal
Making a hole in the center where the bonding strength is low.
Ip manufacturing method . When a dissimilar metal material is friction welded in a state where the surface to be joined of the stainless steel material is decarburized to reduce the carbon content, the amount of transfer of carbon atoms from the stainless steel material is reduced, and the carbon compound Generation is suppressed, and irregularities and the like are formed on the joining surface during friction, so that the joining becomes tight and the joining strength increases. In addition, as the amount of the carbon compound produced decreases, the increase in hardness is small and the elongation is large. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the manufacture of a pipe according to the present invention will be described.
One embodiment of the method will be described with reference to FIGS. In this embodiment, a joint is formed between a stainless steel material 1 having a round bar shape and a Ti-5Ta material 2. [0008] "Decarburization treatment of stainless steel joint surface"
As shown in FIG. 1, a decarburization process is performed on the vicinity of the surface 1a to be joined of the stainless steel material 1 to reduce the amount of carbon inherent in the stainless steel copper 1 to form a decarburized phase 1b. [Smoothing treatment of both joined surfaces] The joined surfaces 1a and 2a of the stainless steel material 1 and the dissimilar metal material (Ti-5Ta material) 2 are smoothed by performing polishing or the like. . [Friction welding] As shown in FIG. 1, the stainless steel material 1 and the dissimilar metal material 2 subjected to the decarburizing treatment and the smoothing treatment are rotated, for example, as shown by arrows in FIG. The dissimilar metal material 2 is linearly moved as shown by the arrow and pressed against to perform friction welding.
When friction welding is performed between the joint surface 1a and the joint surface 2a after the decarburization treatment of the joint surface 1a, the carbon atoms in the joint portion are reduced based on the fact that the carbon content of the tissue near the joint surface 1a is reduced. Is reduced, and thus the generation of a Ti—C compound is suppressed. [Friction Joining State] During friction welding, the surfaces 1a and 2a to be joined are rubbed, and the hardness of the joint surfaces 1a and 2a is reduced due to a decrease in hardness due to the decarburization treatment. Formed relatively easily. Then, the frictional joining is performed uniformly over substantially the entire area of the two joined surfaces 1a and 2a, and the frictional joining strength is enhanced. <Example of Improvement of Hardness> FIG. 2 shows an example of improvement of the hardness of a frictional joint S between a stainless steel material and a Ti-5Ta material. That is, FIG. 2 shows that the hardness of the stainless steel material is La (for example, Hv200) and the hardness of Ti-5Ta
When frictionally joining a material having a hardness of Lm (for example, Hv150), the hardness of the decarburized phase decreases as indicated by a broken line Lb. This shows that when friction welding is performed using this, the hardness of the friction welding portion S becomes Ls (about Hv300). FIG. 3 shows an example in which the friction joining is performed without performing the decarburization treatment, and the hardness of the Fe—Ti phase t and the Ti—C phase u at the friction joining point is Lu.
(Hv400 to 450). <Example of elongation measurement> FIG. 2 (Example of the present invention)
When the elongation of the friction-joined portion between FIG. 3 and FIG. 3 (comparative example) was measured, the former exceeded 5%, but the latter was about 2%. "Production of pipe having dissimilar material joint" As shown by a chain line in FIG. 1, stainless steel material 1 and Ti-5Ta
Since the composite material (composite round bar) obtained by frictionally joining the material 2 is integrated by rotating the stainless steel material 1 as shown by the arrow, the joining strength at the center where the peripheral speed becomes low tends to be small. However, in the case of manufacturing a pipe, if a hole 3 is drilled and removed at the center after the completion of the friction welding, only the portion where the bonding strength is sufficient can be used. <Other Embodiments> The present invention includes the following techniques. (1) The dissimilar metal material to be joined to stainless steel is pure T
a, Nb, Zr and other materials other than Ti-5Ta. (2) The material to be rotated at the time of friction welding is arbitrary, that is, the material is in a relative rotation state. As described above, the pie according to the present invention is
According to the manufacturing method of the flop, the joining surface of the stainless steel material had been decarburizing processed by friction welding and the bonding surface and the bonding surface of the dissimilar metal materials of stainless steel material with a decarburization, joint Therefore, the following effects can be obtained. (1) Even in a dissimilar metal joint in which a carbon-metal compound is easily produced, a joint can be easily formed by stainless steel and each dissimilar metal. (2) By preliminarily reducing the amount of carbon on the surfaces to be joined by decarburization, it is possible to suppress an increase in the hardness of the joint portion, increase the elongation, and secure the mechanical strength of the composite material.
【図面の簡単な説明】
【図１】 本発明に係るパイプの製造方法の実施モデル
例を示す一部を切欠した正面図である。
【図２】 図１例によって脱炭処理ステンレス鋼材とＴ
１−５Ｔａ材とを摩擦接合した場合の硬度変化図であ
る。
【図３】 図１例によって無処理ステンレス鋼材とＴｉ
−５Ｔａ材とを摩擦接合した場合の硬度変化図である。
【符号の説明】
１ ステンレス鋼材
１ａ 被接合面
１ｂ 脱炭相
２ 異種金属材（Ｔｉ−５Ｔａ材）
２ａ 被接合面
３ 穴
Ｓ 摩擦接合箇所BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway front view showing an example of a working model of a pipe manufacturing method according to the present invention. FIG. 2 shows a decarburized stainless steel material and T
It is a hardness change figure at the time of friction-bonding with 1-5Ta material. FIG. 3 shows an untreated stainless steel material and Ti according to the example of FIG.
It is a hardness change figure at the time of friction-joining with -5Ta material. [Description of Signs] 1 Stainless steel material 1a Joined surface 1b Decarburized phase 2 Dissimilar metal material (Ti-5Ta material) 2a Joined surface 3 Hole S Friction joint
Claims (1)
たパイプの製造方法において、 ステンレス鋼材の被接合面を脱炭処理する工程と、該脱
炭処理したステンレス鋼材の被接合面と異種金属材の被
接合面とを摩擦圧接する工程と、ステンレス鋼材及び異
種金属材を摩擦圧接した複合材料の接合強度が小さい中
心部に穴を空ける工程とを有するパイプの製造方法。 (57) [Claims] [Claim 1] A stainless steel material and a dissimilar metal material are joined.
The method of manufacturing a pipe with a step of decarburizing processing joining surface of the stainless steel, the step of friction welding the joining surface of the joining surface of the stainless steel material with a dehydration charcoal treatment and different metal material, stainless steel And different
Medium joining strength of composite material obtained by friction welding of seed metal material
Making a hole in the core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000062478A JP3413455B2 (en) | 2000-03-07 | 2000-03-07 | Pipe manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000062478A JP3413455B2 (en) | 2000-03-07 | 2000-03-07 | Pipe manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001252773A JP2001252773A (en) | 2001-09-18 |
| JP3413455B2 true JP3413455B2 (en) | 2003-06-03 |
Family
ID=18582486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000062478A Expired - Fee Related JP3413455B2 (en) | 2000-03-07 | 2000-03-07 | Pipe manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3413455B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1801432A3 (en) | 2005-12-20 | 2009-07-22 | Yamaha Hatsudoki Kabushiki Kaisha | Connecting rod and method of producing the same |
| CN114833438A (en) * | 2022-05-16 | 2022-08-02 | 福州大学 | Inertia friction welding method for duplex stainless steel and austenitic stainless steel |
-
2000
- 2000-03-07 JP JP2000062478A patent/JP3413455B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001252773A (en) | 2001-09-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |