JP2560794B2 - How to prevent stress corrosion cracking of metal bolts - Google Patents
How to prevent stress corrosion cracking of metal boltsInfo
- Publication number
- JP2560794B2 JP2560794B2 JP63227755A JP22775588A JP2560794B2 JP 2560794 B2 JP2560794 B2 JP 2560794B2 JP 63227755 A JP63227755 A JP 63227755A JP 22775588 A JP22775588 A JP 22775588A JP 2560794 B2 JP2560794 B2 JP 2560794B2
- Authority
- JP
- Japan
- Prior art keywords
- stress corrosion
- corrosion cracking
- metal bolt
- metal bolts
- metal
- 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
Landscapes
- Physical Vapour Deposition (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、例えば原子炉や化学プラントなどの構造
物の構築に固定部材として用いられている金属ボルトに
応力腐食割れが発生するのを防止する方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention prevents occurrence of stress corrosion cracking in a metal bolt used as a fixing member for constructing a structure such as a nuclear reactor or a chemical plant. It is about how to do it.
一般に、上記の構造物の構築に用いられる金属ボルト
には、高強度とすぐれた耐食性が要求されることから、
これらの特性を具備したSUS304Lや316Lなどのオーステ
ナイト系ステンレス鋼製のものや、アロイ600やアロイ
Ｘ−750などのNi基合金製のものなどが用いられてい
る。Generally, the metal bolts used in the construction of the above structures are required to have high strength and excellent corrosion resistance,
Austenitic stainless steels such as SUS304L and 316L having these characteristics, and Ni-based alloys such as alloy 600 and alloy X-750 are used.
しかし、金属ボルトとして、上記の通り強度および耐
食性を有するNi基合金製のものや、オーステナイト系ス
テンレス鋼製のものなどを用いても、上記の使用環境下
では、特にこれのネジ切り部に応力腐食割れが発生する
のを避けることができず、安全性および信頼性、さらに
取り換えのための作業停止に伴なう経済的損失の面か
ら、これの改善が強く望まれている。However, even if a metal bolt made of Ni-based alloy having strength and corrosion resistance as described above, or made of austenitic stainless steel is used as the metal bolt under the above-mentioned use environment, stress is particularly exerted on the threaded portion thereof. The occurrence of corrosion cracking is unavoidable, and there is a strong demand for improvement in terms of safety and reliability, as well as the economic loss associated with the shutdown of work for replacement.
そこで、本発明者等は、上述のような観点から、耐応
力腐食割れ性にすぐれた金属ボルトを開発すべく研究を
行なった結果、高強度およびすぐれた耐食性を有するNi
基合金やオーステナイト系ステンレス鋼などで製造され
た金属ボルトの特に応力腐食割れが発生し易いネジ切り
部表面に、通常のイオン注入装置を用い、窒素（Ｎ）,N
i,Cr,Mo,Ta,およびPtのうちの１種または２種以上のイ
オンを注入すると、耐応力腐食割れ性が一段と向上する
ようになり、応力腐食環境下での長時間に亘る使用に際
しても金属ボルトのネジ切り部に割れが発生するのが皆
無となるという知見を得たのである。Therefore, the present inventors, from the above viewpoints, as a result of research to develop a metal bolt excellent in stress corrosion cracking resistance, as a result, Ni having high strength and excellent corrosion resistance.
Nitrogen (N), N is used on the surface of the threaded portion of a metal bolt made of a base alloy or austenitic stainless steel, where stress corrosion cracking is particularly likely to occur, using an ordinary ion implantation device.
When one or more ions of i, Cr, Mo, Ta, and Pt are implanted, the stress corrosion cracking resistance is further improved, and it can be used for a long time in a stress corrosion environment. Therefore, we have obtained the knowledge that cracks do not occur at the threaded part of metal bolts.
この発明は、上記知見にもとづいてなされたものであ
って、Ni基合金製あるいはオーステナイト系ステンレス
鋼製金属ボルトの少なくともネジ切り部表面（全面であ
ってもよい）にイオン注入処理を施すことにより金属ボ
ルトに応力腐食割れが発生するのを防止する方法に特徴
を有するものである。The present invention has been made based on the above findings, and by subjecting at least the threaded portion surface (may be the entire surface) of a Ni-based alloy or austenitic stainless steel metal bolt to an ion implantation treatment. It is characterized by a method of preventing stress corrosion cracking from occurring in the metal bolt.
つぎに、この発明の方法を実施例により具体的に説明
する。Next, the method of the present invention will be specifically described by way of Examples.
いずれもネジ切り部直径:10mm×全体長さ:60mm×ネジ
切り部長さ:50mmの寸法を有し、重量％で、Ni−15％Cr
−７％Fe−0.7％Al−2.5％Ti−１％Nb＋Taの組成を有す
る750Ni基合金、Ni−19％Cr−３％Mo−19％Fe−0.5％Al
−0.9％Ti−5.1％Nb＋Taの組成を有する718Ni基合金、F
e−8.5％Ni−19％Crの組成を有する304ステンレス鋼、
およびFe−32％Ni−21％Cr−0.4％Al−0.4％Tiの組成を
有する800ステンレス鋼で製造された４種の金属ボルト
を用意し、これらの金属ボルトの全面に、通常のイオン
注入装置を用い、それぞれ第１表に示される条件で１段
あるいは２段以上のイオン注入処理を施すことにより本
発明法１〜17を実施した。All have dimensions of threaded part diameter: 10 mm × overall length: 60 mm × threaded part length: 50 mm, weight%, Ni-15% Cr
750% Ni-based alloy having a composition of -7% Fe-0.7% Al-2.5% Ti-1% Nb + Ta, Ni-19% Cr-3% Mo-19% Fe-0.5% Al
718Ni-based alloy with composition of -0.9% Ti-5.1% Nb + Ta, F
304 stainless steel with a composition of e-8.5% Ni-19% Cr,
And four kinds of metal bolts made of 800 stainless steel having a composition of Fe-32% Ni-21% Cr-0.4% Al-0.4% Ti are prepared, and normal ion implantation is performed on the entire surface of these metal bolts. Using the apparatus, the methods 1 to 17 of the present invention were carried out by performing one-stage or two-stage or more-stage ion implantation treatment under the conditions shown in Table 1.
ついで、本発明法１〜17で処理された金属ボルト、並
びに比較の目的でイオン注入処理を行なわない金属ボル
トについて、応力腐食割れ試験を行なった。 Next, a stress corrosion cracking test was conducted on the metal bolts treated by the methods 1 to 17 of the present invention and the metal bolts not subjected to the ion implantation treatment for the purpose of comparison.
応力腐食割れ試験は、第１図に概略正面図で示される
ように、金属ボルトＳに、いずれもオーステナイト系ス
テンレス鋼製の２個のリング材1,1を間隙形成材２を介
して挿通し、これをワッシャ３を介してナット４で0.8k
g・ｍの力で締め付け、この状態で圧力容器内に装入
し、脱気を施さない温度:290℃の高温高圧水中に、ステ
ンレス鋼製の金属ボルトについては200時間、またNi基
合金製のものについては400時間浸漬保持の条件で行な
い、試験後の金属ボルトのネジ切り部における割れ発生
の有無を観察した。この結果を第１表に示した。In the stress corrosion cracking test, as shown in the schematic front view of FIG. 1, two ring members 1, 1 each made of austenitic stainless steel are inserted through a gap forming member 2 into a metal bolt S. , 0.8k with nut 4 through washer 3
Tighten with a force of gm, put in a pressure vessel in this state, and do not degas. Temperature: 290 ℃ in high temperature high pressure water, stainless steel metal bolts for 200 hours, and Ni base alloy The test piece was subjected to immersion and holding for 400 hours, and the presence or absence of cracking in the threaded portion of the metal bolt after the test was observed. The results are shown in Table 1.
第１表に示される結果から、本発明法１〜17によって
処理された金属ボルトは、いずれも割れ発生がなく、す
ぐれた耐応力腐食割れ性を示すのに対して、イオン注入
処理を行なわない金属ボルトには、すでに応力腐食割れ
が発生していることが明らかである。From the results shown in Table 1, all of the metal bolts treated by the methods 1 to 17 of the present invention have no crack generation and show excellent stress corrosion cracking resistance, whereas they are not ion-implanted. It is clear that stress corrosion cracking has already occurred in the metal bolt.
上述のように、この発明の方法によれば、少なくとも
ネジ切り部表面にイオン注入処理を施すだけの簡単な操
作で、オーステナイト系ステンレス鋼あるいはNi基合金
製の金属ボルトの耐応力腐食割れ性を著しく向上させる
ことができ、したがって、これを応力腐食環境にさらさ
れる原子炉や化学プラントなどの構造物の固定部材とし
て用いた場合、きわめて長期に亘って割れが発生するの
を防止することができることから、安全性、信頼性、お
よび経済性の面で有用な効果が得られるようになるので
ある。As described above, according to the method of the present invention, the stress corrosion cracking resistance of the metal bolt made of austenitic stainless steel or Ni-based alloy can be obtained by a simple operation of at least subjecting the surface of the threaded portion to ion implantation. It can be remarkably improved, and therefore, when it is used as a fixing member for a structure such as a reactor or a chemical plant exposed to a stress corrosion environment, it can prevent cracking from occurring for a very long period of time. Therefore, useful effects can be obtained in terms of safety, reliability, and economy.
第１図は金属ボルトの応力腐食割れ試験態様を示す概略
正面図である。 Ｓ……金属ボルト、１……リング材 ２……間隙形成材、３……ワッシャ ４……ナットFIG. 1 is a schematic front view showing a stress corrosion cracking test mode of a metal bolt. S ... Metal bolt, 1 ... Ring material 2 ... Gap forming material, 3 ... Washer 4 ... Nut
Claims (2)
ンレス鋼製金属ボルトの少なくともネジ切り部表面にイ
オン注入処理を施すことを特徴とする金属ボルトの応力
腐食割れ防止方法。1. A method for preventing stress corrosion cracking of a metal bolt, which comprises subjecting at least the surface of a threaded portion of a metal bolt made of a Ni-base alloy or austenitic stainless steel to an ion implantation treatment.
Ptのうちの１種または２種以上で構成されることを特徴
とする特許請求の範囲第（１）項記載の金属ボルトの応
力腐食割れ防止方法。2. The ions are nitrogen, Ni, Cr, Mo, Ta, and
The method for preventing stress corrosion cracking of a metal bolt according to claim (1), characterized in that the method comprises one or more of Pt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63227755A JP2560794B2 (en) | 1988-09-12 | 1988-09-12 | How to prevent stress corrosion cracking of metal bolts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63227755A JP2560794B2 (en) | 1988-09-12 | 1988-09-12 | How to prevent stress corrosion cracking of metal bolts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0277570A JPH0277570A (en) | 1990-03-16 |
| JP2560794B2 true JP2560794B2 (en) | 1996-12-04 |
Family
ID=16865868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63227755A Expired - Lifetime JP2560794B2 (en) | 1988-09-12 | 1988-09-12 | How to prevent stress corrosion cracking of metal bolts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2560794B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05339705A (en) * | 1992-06-05 | 1993-12-21 | Hitachi Ltd | Method for preventing crevice corrosion of metallic member and metallic member resistant to crevice corrosion |
| JP4820258B2 (en) * | 2006-09-29 | 2011-11-24 | 本田技研工業株式会社 | Article storage structure for small boats |
| EP3042925B1 (en) | 2013-09-02 | 2019-09-18 | JNC Corporation | Method for producing porous cellulose particles, and porous cellulose particles |
| WO2023042267A1 (en) * | 2021-09-14 | 2023-03-23 | 株式会社 東芝 | Fastening member |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61279675A (en) * | 1985-06-04 | 1986-12-10 | Hitachi Ltd | Zr-based alloy base material and its production |
| JPS6319714A (en) * | 1986-07-12 | 1988-01-27 | 住友電気工業株式会社 | Manufacture of conductor for covered wire |
-
1988
- 1988-09-12 JP JP63227755A patent/JP2560794B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61279675A (en) * | 1985-06-04 | 1986-12-10 | Hitachi Ltd | Zr-based alloy base material and its production |
| JPS6319714A (en) * | 1986-07-12 | 1988-01-27 | 住友電気工業株式会社 | Manufacture of conductor for covered wire |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0277570A (en) | 1990-03-16 |
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