JPH08233164A - Screw joint excellent in seizure resistance with no lubricant applied - Google Patents
Screw joint excellent in seizure resistance with no lubricant appliedInfo
- Publication number
- JPH08233164A JPH08233164A JP4324695A JP4324695A JPH08233164A JP H08233164 A JPH08233164 A JP H08233164A JP 4324695 A JP4324695 A JP 4324695A JP 4324695 A JP4324695 A JP 4324695A JP H08233164 A JPH08233164 A JP H08233164A
- Authority
- JP
- Japan
- Prior art keywords
- chemical conversion
- phosphoric acid
- coating layer
- thickness
- resin
- 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.)
- Pending
Links
Landscapes
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Chemical Treatment Of Metals (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、無潤滑下での耐焼付き
性に優れたネジ継手に関し、更に詳しくは原油採掘に使
用する油井管ネジ継手や採掘された原油を輸送するライ
ンパイプ用ネジ継手において、グリスを塗布しない繰り
返し締め付け、緩めに対しても継手が焼付くことなく、
繰り返し使用できる管のネジ継手に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a threaded joint having excellent seizure resistance without lubrication, and more specifically, an oil country tubular goods threaded joint used for crude oil mining and a screw for a line pipe for transporting the mined crude oil. The joint does not seize even if it is tightened and loosened repeatedly without applying grease.
The present invention relates to a pipe threaded joint that can be repeatedly used.
【０００２】[0002]
【従来の技術】油井掘削時に使用するチュービングやケ
ーシングには一般にネジ継手が用いられている。これら
のネジ継手には使用環境下で内外圧、軸力、曲げ等を複
合して被るため、これらの複合荷重下においても継手が
リークしないこと、継手が破損しないことが要求され
る。一方、チュービングやケーシングの降下作業時には
一度、締め込んだ継手を緩めることもあり、一般にチュ
ービングで１０回、ケーシングで３回の締め緩めに対し
ても継手が焼き付くことなく使用できることがＡＰＩ
（米国石油協会）でも望まれている。上記の要求性能を
満たすためには、ＡＰＩ ＢＵＬ５Ａ２に述べられてい
るコンパウンドグリスを塗布して継手を締め込むことが
現在まで常識化している。ここでのコンパウンドグリス
の役割は耐焼付き性の確保とシール性の向上にある。2. Description of the Related Art Threaded joints are generally used for tubing and casings used for oil well excavation. Since these screw joints are subjected to a combination of internal and external pressure, axial force, bending, etc. under the use environment, it is required that the joints do not leak and the joints do not break even under these combined loads. On the other hand, when the tubing or casing is lowered, the joints that have been tightened may be loosened once. Generally, it is possible to use the joints without seizing even after tightening and loosening 10 times for tubing and 3 times for casings.
It is also desired by (American Petroleum Institute). In order to satisfy the above-mentioned required performance, it has become common knowledge until now to apply the compound grease described in API BUL5A2 and tighten the joint. The role of the compound grease here is to secure seizure resistance and improve sealing performance.
【０００３】その後、シール性をより向上させる発明と
して金属対金属接接触部を有する特殊ネジ継手、すなわ
ち、プレミアムジョイントの開発が盛んになされ、種々
な形状のシール部を有するプレミアムジョイント（特公
昭５９−４４５５２号公報、特公平５−４１８７６号公
報）が発明されている。このような発明により、継手の
ガスシール性は管体降伏強度と同等以上にまで向上させ
るに至った。しかしながら、より優れたシール性を得る
には金属接触部に母材の降伏点をも越えるような、より
高い面圧を付与しなければならないため、焼付きの中で
も修復不可能なゴーリングが発生し易くなり、ゴーリン
グを防止する研究が盛んに行われるようになってきた。After that, as an invention for further improving the sealing property, a special screw joint having a metal-to-metal contact portion, that is, a premium joint has been actively developed, and a premium joint having seal portions of various shapes (Japanese Patent Publication Sho 59). No. 44552 and Japanese Patent Publication No. 5-41876) have been invented. With such an invention, the gas sealability of the joint has been improved to a level equal to or higher than the yield strength of the tubular body. However, in order to obtain a better sealing property, it is necessary to apply a higher surface pressure to the metal contact part so as to exceed the yield point of the base material. It has become easier and the research to prevent the galling has been actively conducted.
【０００４】このゴーリング防止対策として、コンパウ
ンドグリスに亜鉛、鉛、銅等の重金属粉、あるいは雲母
等の無機物を適切に含有させるグリスの開発やシール部
形状に工夫を凝らすことで局部面圧を軽減するもの（特
開昭６２−２０９２９１号公報、特開平４−２７７３９
２号公報）や、シール面の性状を制御したもの（実公平
６−７１３号公報）や表面処理によりゴーリング性を向
上させるもの（特公平３−７８５１７号公報、特開平５
−１１７８７０号公報、特開昭６２−２５８２８３号公
報、特開昭６０−２６６９５号公報、特開昭５８−３１
０９７号公報、特開昭５８−１７２８５号公報、特開昭
６１−１２４７９２号公報、特開昭６１−１３６０８７
号公報）等がある。係る各特許公報に示す技術もそれな
りに効果があり、特に適切な表面処理とコンパウンドグ
リスを用いることで耐焼付き性も実用的に充分な範囲に
まで向上してきた。As a measure to prevent this galling, the local surface pressure is reduced by developing a grease in which heavy metal powder such as zinc, lead, copper or the like, or an inorganic substance such as mica is appropriately contained in the compound grease and devising the shape of the seal portion. (JP-A-62-209291, JP-A-4-27739)
No. 2), one in which the properties of the sealing surface are controlled (Jpn. Pat. Appln. KOKAI No. 6-713), and one in which the goring property is improved by a surface treatment (JP-B-3-78517, JP-A-5-78517).
-117870, JP-A-62-258283, JP-A-60-26695, and JP-A-58-31.
097, JP-A-58-17285, JP-A-61-124792, JP-A-61-136087.
Issue gazette) etc. The techniques disclosed in the respective patent publications have their effects to some extent, and seizure resistance has been improved to a practically sufficient range by using an appropriate surface treatment and compound grease.
【０００５】特に、特公平３−７８５１７号公報には油
井管ネジ継手に二硫化モリブデンを分散混合させた樹脂
被膜を形成されるものが知られている。しかし、係る公
報は樹脂被膜層を金属対金属接触部の表面粗さ以下に形
成さている。これはコンパウンドグリス塗布を念頭に置
いたもので、最終表面の凹凸にグリスが封入される効果
を狙ったもので、無グリス潤滑下での締め緩めに対して
は下地の表面粗さによる選択的接触により安定した耐焼
付き性は得られない。また、経時劣化を最小限にするた
めの下地処理の考えはなく、粗さのみについての言及で
は長期に亘る安定した耐焼付き性を得ることが出来ない
という問題がある。In particular, Japanese Patent Publication No. 3-78517 discloses that an oil well pipe threaded joint is provided with a resin coating in which molybdenum disulfide is dispersed and mixed. However, in this publication, the resin coating layer is formed so as to have a surface roughness less than that of the metal-to-metal contact portion. This is intended for compound grease application, aiming at the effect of grease being filled in the unevenness of the final surface, and selective for the tightening and loosening under grease-free lubrication by the surface roughness of the base. Stable seizure resistance cannot be obtained by contact. Further, there is no idea of a base treatment for minimizing deterioration with time, and there is a problem that stable seizure resistance cannot be obtained over a long period of time by mentioning only roughness.
【０００６】更に、特開平６−１０１５４号公報には表
面処理前の表面最大粗さと表面処理被膜厚さの関係を規
定したものが知られている。しかし、係る公報は金属接
触部の隙間を小さくすることでシール性の向上を狙った
ものであり、尚かつ、コンパウンドグリスの効果につい
て述べているものの、上記同様無潤滑下の耐焼付き性に
ついては全く述べられていない。さらに実施例として述
べられている金属系の表面処理では無グリス潤滑下での
耐焼付き性が期待できないことは前述したとおりであ
る。Further, Japanese Laid-Open Patent Publication No. 6-10154 discloses that which defines the relationship between the maximum surface roughness before surface treatment and the film thickness of the surface treatment. However, this publication aims at improving the sealability by reducing the gap between the metal contact portions, and, while mentioning the effect of compound grease, the seizure resistance under non-lubrication is similar to the above. Not mentioned at all. Further, as described above, the metal-based surface treatment described as an example cannot be expected to have seizure resistance under grease-free lubrication.
【０００７】[0007]
【発明が解決しようとする課題】このような状況のもと
に、近年の研究として塗布したグリスがメークアップ
（締め付け）中に高圧になり使用性能を劣化させること
（特開昭６３−２１０４８７号公報、特開平６−１１０
７８号公報）やコンパウンドグリスに含有されている重
金属分に起因した環境汚染問題などが取り上げられ、重
金属分を含まないコンパウンドグリスの商品化などコン
パウンドグリスに関わる問題が生じ始めた。１９９１年
に制定されたＡＩＰ ＲＰ５Ｃ５にも継手性能に及ぼす
グリス量やグリス圧力の問題を評価するプログラムとな
っている。それにも増して、コンパウンドグリスの塗布
作業は作業環境を悪化させると同時に作業効率をも低下
させている。従って、このようなコンパウンドグリスを
一切用いることなく、従来の性能、特にゴーリング性を
確保できれば上述した問題点を一掃できる画期的なネジ
継手となる。それにも拘らず、コンパウンドグリスを用
いざるを得ないのは完全無グリス潤滑下では従来の技術
ではゴーリング性が数段劣化することにあった。Under such circumstances, as a recent research, the grease applied has a high pressure during makeup (tightening) and deteriorates the use performance (Japanese Patent Laid-Open No. 63-210487). Japanese Patent Laid-Open No. 6-110
No. 78) and environmental problems caused by heavy metal components contained in compound grease, and problems related to compound grease such as commercialization of compound grease not containing heavy metal components have begun to occur. The AIP RP5C5 established in 1991 is also a program to evaluate the problems of grease amount and grease pressure that affect the joint performance. Moreover, the application of compound grease not only deteriorates the work environment but also reduces the work efficiency. Therefore, an epoch-making threaded joint which can eliminate the above-mentioned problems if the conventional performance, especially the galling property can be secured without using such compound grease at all. Nevertheless, the reason why compound grease has to be used is that the galling property is deteriorated by several steps in the conventional technique under completely grease-free lubrication.
【０００８】上述しような問題を解消するべき、発明者
らは鋭意研究を重ねた結果、従来において継手メークア
ップ前に塗布していたコンパウンドグリスなどの液体潤
滑剤を一切使用することなく、繰り返しの締め、緩めに
対してゴーリングを起こすことなく、かつシール性等の
使用性能も満足することが出来る管ネジ継手を提供する
ことにある。その発明の要旨とするところは、 （１）雄ネジとネジなし金属接触部からなるピンと雌ネ
ジとネジなし金属接触部からなるボックスから構成され
る管のネジ継手において、ボックスまたはピンの接触表
面に、燐酸系化成処理被膜層あるいは窒化処理層と燐酸
系化成処理被膜層を設けると共に、二硫化モリブデン粉
末を樹脂に分散混合した樹脂被膜層を該燐酸系化成処理
被膜層上に形成し、前記樹脂被膜の膜厚を該燐酸系化成
処理被膜層の膜厚以上としたピン、ボックス螺合時にグ
リス及び液体潤滑剤なしの無潤滑下での耐焼付き性に優
れたネジ継手。As a result of intensive studies, the inventors of the present invention should solve the above-mentioned problems, and as a result, repeated use without using any liquid lubricant such as compound grease which has been conventionally applied before making up a joint. An object of the present invention is to provide a threaded joint for pipes that does not cause galling when tightened or loosened and can satisfy the use performance such as sealing property. The gist of the invention is as follows: (1) In a threaded joint for a pipe composed of a pin consisting of a male screw and a metal contact part without a screw and a box consisting of a female screw and a metal contact part without a screw, the contact surface of the box or the pin A phosphoric acid-based chemical conversion treatment coating layer or a nitriding treatment layer and a phosphoric acid-based chemical conversion treatment coating layer, and a resin coating layer in which molybdenum disulfide powder is dispersed and mixed in a resin is formed on the phosphoric acid-based chemical conversion treatment coating layer. A threaded joint excellent in seizure resistance under no lubrication without grease and liquid lubricant when screwing a pin or a box in which the resin film has a thickness equal to or larger than that of the phosphoric acid-based chemical conversion coating layer.
【０００９】（２）雄ネジとネジなし金属接触部からな
るピンと雌ネジとネジなし金属接触部からなるボックス
から構成される管のネジ継手において、ボックスまたは
ピンの接触表面に、燐酸系化成処理被膜層あるいは窒化
処理層と燐酸系化成処理被膜層を設けると共に、二硫化
モリブデン粉末を樹脂に分散混合した樹脂被膜層を該燐
酸系化成処理被膜層上に形成し、前記樹脂被膜の膜厚を
該燐酸系化成処理被膜層の膜厚以上とし、かつ相対する
摺動面の表面粗さを前記樹脂被膜層の厚さより小さく
し、ピン、ボックス螺合時にグリス及び液体潤滑剤なし
の無潤滑下での耐焼付き性に優れたネジ継手。(2) In a threaded joint of a pipe composed of a pin consisting of a male screw and a metal contact portion without a screw and a box consisting of a female screw and a metal contact portion without a screw, the contact surface of the box or the pin is treated with phosphoric acid conversion treatment. A coating layer or a nitriding treatment layer and a phosphoric acid-based chemical conversion treatment coating layer are provided, and a resin coating layer in which molybdenum disulfide powder is dispersed and mixed in a resin is formed on the phosphoric acid-based chemical conversion treatment coating layer. The thickness of the phosphoric acid-based chemical conversion treatment film layer is equal to or larger than that of the resin film layer, and the surface roughness of the opposing sliding surface is smaller than the thickness of the resin film layer. A screw joint with excellent seizure resistance.
【００１０】（３）雄ネジとネジなし金属接触部からな
るピンと雌ネジとネジなし金属接触部からなるボックス
から構成される管のネジ継手において、ボックスまたは
ピンの接触表面に、厚さ５〜３０μｍの燐酸系化成処理
被膜層あるいは厚さ１〜２０μｍの窒化処理層と厚さ５
〜３０μｍの燐酸系化成処理被膜層を設けると共に、二
硫化モリブデン粉末を樹脂に、０．２≦｛（二硫化モリ
ブデン粉末）の含有量｝／｛（樹脂）の含有量｝≦９の
割合に分散混合した樹脂被膜層を該燐酸系化成処理被膜
層上に厚さ１０〜４５μｍに形成し、前記樹脂被膜の膜
厚を該燐酸系化成処理被膜層の膜厚以上としたピン、ボ
ックス螺合時にグリス及び液体潤滑剤なしの無潤滑下で
の耐焼付き性に優れたネジ継手。(3) In a threaded joint of a pipe comprising a pin consisting of a male screw and a metal contact part without a screw and a box consisting of a female screw and a metal contact part without a screw, the contact surface of the box or the pin has a thickness of 5 to 5. 30 μm phosphoric acid-based chemical conversion treatment coating layer or 1-20 μm thick nitriding treatment layer and thickness 5
A phosphoric acid-based chemical conversion coating layer having a thickness of up to 30 μm is provided, and molybdenum disulfide powder is used as a resin, and the ratio is 0.2 ≦ {(molybdenum disulfide powder) content / {(resin) content} ≦ 9. A resin film layer dispersed and mixed is formed on the phosphoric acid-based chemical conversion treatment film layer to a thickness of 10 to 45 μm, and the resin film has a thickness equal to or larger than that of the phosphoric acid-based chemical conversion treatment film layer. Sometimes a threaded joint with excellent seizure resistance under no lubrication without grease or liquid lubricant.
【００１１】（４）雄ネジとネジなし金属接触部からな
るピンと雌ネジとネジなし金属接触部からなるボックス
から構成される管のネジ継手において、ボックスまたは
ピンのいずれか一方の接触表面に、厚さ５〜３０μｍの
燐酸系化成処理被膜層、あるいは厚さ１〜２０μｍの窒
化処理層と厚さ５〜３０μｍの燐酸系化成処理被膜層を
設けると共に、二硫化モリブデン粉末を樹脂に、０．２
≦｛（二硫化モリブデン粉末）の含有量｝／｛（樹脂）
の含有量｝≦９の割合に分散混合した樹脂被膜層を該燐
酸系化成処理被膜層上に厚さ１０〜４５μｍに形成し、
前記樹脂被膜の膜厚を該燐酸系化成処理被膜層の膜厚以
上とし、かつ相対する摺動面の表面粗さを前記樹脂被膜
層の厚さより小さくし、ピン、ボックス螺合時にグリス
及び液体潤滑剤なしの無潤滑下での耐焼付き性に優れた
ネジ継手。 （５）（１）〜（４）記載の樹脂に腐食抑制剤を分散混
合したことを特徴とする無潤滑下での耐焼付き性に優れ
たネジ継手にある。(4) In a threaded joint of a pipe composed of a pin consisting of a male screw and a metal contact part without a screw and a box consisting of a female screw and a metal contact part without a screw, on the contact surface of either the box or the pin, A phosphoric acid-based chemical conversion treatment coating layer having a thickness of 5 to 30 μm, or a nitriding treatment layer having a thickness of 1 to 20 μm and a phosphoric acid chemical conversion treatment coating layer having a thickness of 5 to 30 μm are provided, and molybdenum disulfide powder is added to the resin as a 0. Two
≤ {(molybdenum disulfide powder) content} / {(resin)
Content of ≦ 9, and a resin coating layer dispersed and mixed in a proportion of ≦ 9 is formed on the phosphoric acid-based chemical conversion coating layer to a thickness of 10 to 45 μm,
The film thickness of the resin film is made equal to or larger than the film thickness of the phosphoric acid-based chemical conversion treatment film layer, and the surface roughness of the opposing sliding surface is made smaller than the film thickness of the resin film layer, and grease and a liquid are used when the pin and the box are screwed. A screw joint with excellent seizure resistance without lubrication and without lubrication. (5) A screw joint excellent in seizure resistance under non-lubrication, characterized in that a resin as described in (1) to (4) is dispersed and mixed with a corrosion inhibitor.
【００１２】[0012]
【作用】以下、本発明について図面に従って詳細に説明
する。図１に本発明を適用した継手構成部材の概略図を
示す。図１に示すように、継手部材であるボックス１と
ピン（鋼管先端継手部）２について、それぞれの継手部
材を構成するネジ部３および金属−金属接触部４に対し
て、ボックス１のみ、あるいはボックス１とピン２の接
触界面に燐酸マンガン系化成処理被膜層または下地窒化
処理と燐酸マンガン系化成処理被膜層および樹脂被膜層
を施し、継手螺合中には係る表面処理層と相対する母材
表面が摺動する。図２は各継手構成部材の組立構成を示
す図である。図２に示すようにボックス１とピン２を嵌
合させ、それぞれのネジ部３、金属−金属接触部４に高
面圧を付与しつつ摺動させる。このような構造におい
て、一般に継手径が大きくなるほど耐焼付き性が厳しく
なるものである。そこで、例えば１０回の締め緩めに対
して、ゴーリングを起こさないことが要求されるチュー
ビングサイズの最大径、φ１７８ｍｍの金属対金属接触
部を有するプレミアムジョイントに対して耐焼付き性の
評価試験を行った。The present invention will be described in detail below with reference to the drawings. FIG. 1 shows a schematic view of a joint constituent member to which the present invention is applied. As shown in FIG. 1, for a box 1 and a pin (steel pipe tip joint portion) 2 which are joint members, only the box 1 or the screw portion 3 and the metal-metal contact portion 4 constituting each joint member, or A manganese phosphate-based chemical conversion treatment coating layer or a base nitriding treatment and a manganese phosphate-based chemical conversion treatment coating layer and a resin coating layer are applied to the contact interface between the box 1 and the pin 2, and the base material faces the surface treatment layer during joint screwing. The surface slides. FIG. 2 is a diagram showing an assembly configuration of each joint component member. As shown in FIG. 2, the box 1 and the pin 2 are fitted to each other, and the screw portion 3 and the metal-metal contact portion 4 are slid while applying high surface pressure. In such a structure, the seizure resistance generally becomes more severe as the joint diameter increases. Therefore, for example, a seizure resistance evaluation test was performed on a premium joint having a metal-to-metal contact portion with a maximum diameter of 178 mm, which is a tubing size required not to cause galling after ten times of tightening and loosening. .
【００１３】図３は各種表面処理とゴーリング発生時の
回数との関係を示す図である。図３に示すように、亜鉛
メッキ、銅メッキ、錫メッキ、燐酸塩処理、サンドブラ
ストを施したボックスと機械加工のままのピンに潤滑剤
を塗布することなく、締め緩めを行った場合の各種類の
焼付き発生回数を示しており、最も焼付き性に優れると
言われる銅メッキでさえも僅か３回目でゴーリングが発
生し、無潤滑下で耐ゴーリング性を確保することがいか
に難易度の高い技術であることが判る。何故ならば、通
常プレミアムジョイントはガスシールを行うために金属
対金属接触部に６００ＭＰａにも及ぶ母材自身の降伏点
をも越えるような高面圧を発生し、継手のメークアッ
プ、ブレークアウト中には係る高面圧下で金属同士が摺
動するからである。FIG. 3 is a diagram showing the relationship between various surface treatments and the number of times of occurrence of goring. As shown in Fig. 3, each type when tightening and loosening is performed without applying lubricant to the galvanized, copper-plated, tin-plated, phosphate-treated, sandblasted box and as-machined pin. The number of occurrences of seizure is shown. Even with copper plating, which is said to have the best seizure property, galling occurs at the third time, and how difficult it is to ensure galling resistance without lubrication. It turns out to be technology. The reason for this is that, normally, a premium joint generates a high surface pressure in the metal-to-metal contact area that exceeds 600 MPa of the base metal itself in order to perform gas sealing, and during joint make-up and breakout. This is because the metals slide with each other under such a high surface pressure.
【００１４】そこで、発明者らは高面圧下での潤滑機能
に優れる二硫化モリブデンに着目し、油井管ネジ継手に
関する固体潤滑被膜の研究に取り組んだ。一般に潤滑剤
の潤滑効果は使用条件、すなわち、面圧、摺動速度、潤
滑剤の種類及び有無、面性状及び温度等によって大きく
異なることも知られている。二硫化モリブデンにおいて
も、その使用方法により極めて優れた耐焼付き性を発揮
したり、通常のグリス潤滑よりも劣る場合があることが
知られている。特に二硫化モリブデンの場合、その下地
処理とバインダー（結合剤）が潤滑性の良否を左右する
と言っても過言ではない。Therefore, the inventors have paid attention to molybdenum disulfide, which has an excellent lubricating function under a high surface pressure, and have researched solid lubricant coatings for oil well pipe threaded joints. In general, it is known that the lubricating effect of a lubricant greatly varies depending on the use conditions, that is, the surface pressure, the sliding speed, the type and presence of the lubricant, the surface properties, the temperature, and the like. It is known that molybdenum disulfide may exhibit extremely excellent seizure resistance or may be inferior to ordinary grease lubrication depending on the method of use. In particular, in the case of molybdenum disulfide, it is no exaggeration to say that the surface treatment and the binder (binder) determine the quality of lubricity.
【００１５】以上の理由から耐焼付き性の評価に当たっ
ては実継手を用いることが最も望ましいわけであるが、
先ずは被膜潤滑性の相対比較を行う観点からピン−オン
−ディスクタイプの焼付き評価試験機を開発し、小型サ
ンプルによる評価を行った。ここでバウデン摩擦試験機
等の既存の焼付き評価試験機を用いず、独自の試験機で
評価に当たったことは、前述のように被膜の耐焼付き向
上効果は使用環境によって大きく異なるためである。プ
レミアムジョイントの場合、接触面圧が前述のように非
常に大きいため、小型試験においても係る高面圧を付与
する必要があるからである。図４に本発明での試験の概
要を示す。以下にサンプル及び実験条件を示す。From the above reasons, it is most desirable to use the actual joint in evaluating the seizure resistance.
First, a pin-on-disk type seizure evaluation tester was developed from the viewpoint of relative comparison of film lubricity, and evaluation was performed using a small sample. Here, the original seizure evaluation tester was used instead of the existing seizure evaluation tester such as the Bowden friction tester because the seizure resistance improvement effect of the coating greatly differs depending on the use environment as described above. . This is because, in the case of the premium joint, the contact surface pressure is extremely large as described above, and therefore it is necessary to apply the high surface pressure even in the small test. FIG. 4 shows an outline of the test in the present invention. The samples and experimental conditions are shown below.
【００１６】 [0016]
【００１７】ここで言うピンに耐焼付き性のある被膜を
施し、例えば実継手のボックスを想定し、ディスクには
例えば実継手のピンを想定し、実継手同等の旋盤加工に
よる表面粗さを付与した。一回転当たりの摺動距離は１
７８ｍｍ外径のパイプに相当し、実継手で許される最大
の摺動速度で実継手同等の高面圧を付与した。更に特徴
的なことはグリスなどの潤滑剤を一切用いることなく、
耐焼付き性を評価したことにある。先ず、発明者らは既
存の金属メッキをマトリックスに二硫化モリブデンを分
散混合した表面処理、いわゆる分散メッキの評価を行っ
た。その結果を図５に示す。すなわち、図５は分散メッ
キによる表面被膜の種類と焼付きまでの摺動距離との関
係を示す図であり、この図より分散メッキの耐焼付き性
はマトリックス金属の耐焼付き性に大きく左右され、二
硫化モリブデンの分散効果は殆ど現れず、むしろ、金属
マトリックス単体の耐焼付き性の方が優れる場合が多い
ことが判る。これは高面圧特有の現象であり、軽荷重下
では一般的に言われるように二硫化モリブデンの効果が
現れ、分散メッキの方が優れた耐焼付き性を呈したもの
である。The pins referred to here are coated with a seizure resistant film, for example, assuming a box of an actual joint, and assuming a pin of an actual joint for the disk, for example, a surface roughness by lathe processing equivalent to that of the actual joint is given. did. Sliding distance per rotation is 1
Corresponding to a pipe with an outer diameter of 78 mm, a high surface pressure equivalent to that of the actual joint was applied at the maximum sliding speed allowed by the actual joint. What is more characteristic is that without using any lubricant such as grease,
It is in evaluating the seizure resistance. First, the inventors evaluated the so-called dispersion plating, which is a surface treatment in which molybdenum disulfide is dispersed and mixed in an existing metal plating matrix. The result is shown in FIG. That is, FIG. 5 is a diagram showing the relationship between the type of surface coating by dispersion plating and the sliding distance until seizure. From this figure, the seizure resistance of dispersion plating is greatly influenced by the seizure resistance of the matrix metal, It is understood that the dispersion effect of molybdenum disulfide hardly appears, and rather the seizure resistance of the metal matrix alone is often superior. This is a phenomenon peculiar to high surface pressure, and under the light load, the effect of molybdenum disulfide appears, as is generally said, and dispersion plating exhibits superior seizure resistance.
【００１８】次に、ポリアミドイミド、エポキシ、フラ
ン等の樹脂をバインダーに二硫化モリブデン粉末を分散
混合させたコーティングの評価結果を図６に示す。すな
わち、図６は各種樹脂に二硫化モリブデン粉末を分散混
合させた被膜と焼付きまでの摺動距離との関係を示す図
であり、ここで下地処理としては燐酸マンガン系化成処
理を施した。かかる被膜の耐焼付き性は従来最も優れて
いると言われていた銅メッキの１０倍以上の耐焼付き性
を呈し、一時的に設定していた最大試験摺動距離８０ｍ
に達してもコーティングすることはなかった。バインダ
ーの種類による耐焼付き性の有意差が明確に現れ、ポリ
アミドイミド、エポキシ、フランの順に優れていること
が判った。これは樹脂自身の引張強度、衝撃値と関係す
るものである。Next, FIG. 6 shows the evaluation results of the coating prepared by dispersing and mixing molybdenum disulfide powder in a binder of a resin such as polyamide-imide, epoxy and furan. That is, FIG. 6 is a diagram showing a relationship between a coating film obtained by dispersing and mixing molybdenum disulfide powder in various resins and a sliding distance until seizure. Here, a manganese phosphate chemical conversion treatment was performed as a base treatment. The seizure resistance of such a coating exhibits seizure resistance 10 times or more that of copper plating, which has been said to be the best in the past, and the maximum test sliding distance set to 80 m was set temporarily.
It did not coat even when it reached. A significant difference in seizure resistance depending on the type of binder was clearly shown, and it was found that polyamideimide, epoxy, and furan were superior in that order. This is related to the tensile strength and impact value of the resin itself.
【００１９】しかも、上述の有機樹脂が、０．２≦
｛（二硫化モリブデン粉末）の含有量｝／｛（樹脂）の
含有量｝≦９の割合に分散混合した樹脂被膜層を下地処
理である燐酸系化成処理被膜層上に厚さ１０〜４５μｍ
に形成せしめる必要がある。二硫化モリブデン粉末と有
機樹脂バインダーの組成比が０．２未満の場合には、形
成される固体潤滑被膜層の目的とする潤滑機能の向上効
果が得られ難く、また、組成比が９を越える場合には、
形成された固体潤滑被膜層の密着性が劣化し、特に被膜
層からの二硫化モリブデン粉末の剥離が著しい等の欠点
を生じるので好ましくない。従って、固体潤滑被膜層を
形成するために使用される処理剤の必須含有成分である
二硫化モリブデン粉末と有機樹脂バインダーの含有組成
比は０．２〜９の範囲とする。Moreover, the above-mentioned organic resin is 0.2 ≦
A thickness of 10 to 45 μm on the phosphoric acid-based chemical conversion treatment coating layer, which is the base treatment, of the resin coating layer dispersed and mixed in a ratio of {(content of molybdenum disulfide powder)} / {(content of resin)} ≦ 9.
Need to be formed. When the composition ratio of the molybdenum disulfide powder and the organic resin binder is less than 0.2, it is difficult to obtain the desired effect of improving the lubricating function of the formed solid lubricating coating layer, and the composition ratio exceeds 9 in case of,
It is not preferable because the formed solid lubricating coating layer has poor adhesion, and in particular, defects such as remarkable separation of the molybdenum disulfide powder from the coating layer occur. Therefore, the content composition ratio of the molybdenum disulfide powder, which is an essential content component of the treatment agent used for forming the solid lubricating coating layer, and the organic resin binder is in the range of 0.2 to 9.
【００２０】これらの樹脂被膜層を下地処理された燐酸
系化成処理被膜層上に厚さ１０〜４５μｍ形成させるも
ので、この被膜厚さが１０μｍ未満の場合には、本発明
の目的とする潤滑性能向上の効果が少なく、特に鋼管継
手のメークアップとブレークアウトの繰り返し使用回数
が減少する等の問題を生ずるので好ましくない。一方、
該被膜層の厚さが４５μｍを越える場合には、潤滑機能
向上効果が飽和するとともに、経済的に不利である。む
しろ、固体潤滑被膜層の密着性が劣化する傾向が増加
し、該被膜層の剥離によるムシレの発生する原因になる
ので好ましくない。従って、樹脂被膜層の厚さは１０〜
４５μｍの範囲、好ましくは１５〜４０μｍの範囲に規
制した。These resin coating layers are formed on the phosphoric acid-based chemical conversion coating layer which has been subjected to the surface treatment to a thickness of 10 to 45 μm. When the coating thickness is less than 10 μm, the lubrication which is the object of the present invention. This is not preferable because it has a small effect of improving the performance and causes a problem that the number of times of repeated use of make-up and breakout of the steel pipe joint is reduced. on the other hand,
When the thickness of the coating layer exceeds 45 μm, the effect of improving the lubricating function is saturated and it is economically disadvantageous. Rather, it is not preferable because the tendency of the adhesion of the solid lubricating coating layer to deteriorate increases, which causes peeling of the coating layer to cause rusting. Therefore, the thickness of the resin coating layer is 10 to 10.
It was restricted to a range of 45 μm, preferably 15 to 40 μm.
【００２１】また、コーティングの下地処理は二硫化モ
リブデンの特長を活かす最も重要な要素であるため、耐
焼付き性に及ぼす下地処理の影響を評価したものが図７
である。すなわち、図７は各種下地処理した場合の樹脂
に二硫化モリブデン粉末を分散混合させた表面被膜と焼
付きまでの摺動距離との関係を示す図であり、ここでは
下地処理として燐酸マンガン系化成処理、窒化処理、サ
ンドブラスト、無処理について評価試験を行った。その
結果、耐焼付き性は燐酸マンガン系化成処理、窒化処
理、サンドブラスト、無処理の順に優れ、下地処理なし
の場合は銅メッキ程度の耐焼付き性しかないことが判っ
た。また、窒化後燐酸マンガン系処理をすることで耐焼
付き性は最も安定する。もう一つの注目すべきことは、
下地処理にサンドブラストを用いた場合、二硫化モリブ
デンの効果に非常にばらつきがでることである。これは
グリス潤滑剤を伴わない焼付き試験ではサンドブラスト
による凹凸の凸部が選択的に相手金属と接触し、樹脂被
膜が部分的に損耗し、金属同士の凝着が起こりゴーリン
グ性は発生し易くなるものと考えられる。Further, since the surface treatment of the coating is the most important factor for utilizing the characteristics of molybdenum disulfide, the evaluation of the influence of the surface treatment on the seizure resistance is shown in FIG.
Is. That is, FIG. 7 is a diagram showing the relationship between the surface coating in which molybdenum disulfide powder is mixed and mixed with the resin and the sliding distance until seizure when various kinds of surface treatment are performed. Here, manganese phosphate-based chemical conversion is used as the surface treatment. An evaluation test was conducted on treatment, nitriding treatment, sandblasting, and no treatment. As a result, it was found that the seizure resistance was excellent in the order of manganese phosphate-based chemical conversion treatment, nitriding treatment, sandblasting, and no treatment, and seizure resistance equivalent to copper plating was obtained without the base treatment. Further, the seizure resistance is most stable by performing the manganese phosphate treatment after nitriding. Another thing to note is
When sandblasting is used for the base treatment, the effect of molybdenum disulfide varies greatly. This is because in a seizure test without a grease lubricant, the convex and concave parts due to sandblasting selectively contact the mating metal, the resin coating partly wears, and metal-metal adhesion occurs, which easily causes galling. It is supposed to be.
【００２２】このメカニズムに着目し、燐酸マンガン系
化成処理について被膜厚さの効果を検討したところ、厚
さ５〜３０μｍの燐酸系化成処理被膜層を設けることが
最適であることが判った。すなわち、燐酸系化成処理被
膜層の厚さが５μｍ未満では化成処理被膜層の均一被膜
性が十分でなく、固体潤滑被膜層に対する十分な密着性
向上効果、特に腐食環境に長時間曝された場合の密着
性、所謂経時後の密着性向上効果が得られにくく、ま
た、固体潤滑被膜層が消耗後の潤滑性能が良くなく、本
発明の目的とする鋼管継手の耐ゴーリング性の向上効果
が不十分である。一方、燐酸系化成処理被膜層が厚さ３
０μｍを越えて生成される場合には、二次結晶が生成さ
れる傾向が著しく、該被膜自体の密着性が劣化するとと
もに、樹脂被膜層の密着性も劣化させるので好ましくな
い。従って、本発明においては、燐酸系化成処理被膜層
が厚さは５〜３０μｍの範囲、好ましくは１０〜２５μ
ｍの範囲に限定した。Focusing on this mechanism, the effect of the film thickness on the manganese phosphate chemical conversion treatment was examined, and it was found that it is optimal to provide a phosphoric acid chemical conversion coating layer having a thickness of 5 to 30 μm. That is, when the thickness of the phosphoric acid-based chemical conversion coating layer is less than 5 μm, the uniform coating property of the chemical conversion coating layer is not sufficient, and the sufficient adhesion improving effect on the solid lubricating coating layer, especially when exposed to a corrosive environment for a long time. It is difficult to obtain the effect of improving the adhesiveness, that is, the so-called adhesive property after aging, and the lubricating performance after the solid lubricating coating layer is worn is not good, so that the effect of improving the galling resistance of the steel pipe joint, which is the object of the present invention, is unsatisfactory. It is enough. On the other hand, the phosphoric acid-based chemical conversion coating layer has a thickness of 3
If the thickness exceeds 0 μm, secondary crystals tend to be generated, and the adhesiveness of the coating itself deteriorates, and the adhesiveness of the resin coating layer also deteriorates, which is not preferable. Therefore, in the present invention, the phosphoric acid-based chemical conversion coating layer has a thickness in the range of 5 to 30 μm, preferably 10 to 25 μm.
The range is limited to m.
【００２３】さらに、本発明においては、必要に応じて
燐酸系化成処理被膜層、特に燐酸マンガン系化成処理被
膜層のさらなる付着強度の向上、あるいは、この被膜層
の均一な生成が阻害される鋼成分の鋼管継手に対する燐
酸マンガン系化成処理被膜層の均一な生成促進および樹
脂被膜層の消耗後の潤滑効果の長時間に亘る確保を目的
として、拡散処理による窒化処理層が燐酸マンガン系化
成処理被膜層の下地処理層として設けられる。而して、
これらの作用、効果を得るためには下地窒化処理層の厚
さは１μｍ以上２０μｍ以下の範囲に限定される。この
下地窒化処理層の厚さが１μｍ未満の場合には、窒化処
理層に欠陥部が多く生成されるため、上記の効果が得ら
れにくく好ましくない。一方、下地窒化処理層の厚さが
２０μｍを越える場合には、上述した効果が飽和すると
ともに、むしろ窒化層の硬度が高いために、その厚さ増
加による鋼管継手の材質変化をもたらすため好ましくな
い。従って、本発明においては下地窒化処理層の厚さは
１〜２０μｍの範囲、好ましくは５〜１５μｍの厚さに
限定される。Further, in the present invention, a steel which, if necessary, further improves the adhesion strength of a phosphoric acid-based chemical conversion coating layer, particularly a manganese phosphate-based chemical conversion coating layer, or prevents uniform formation of this coating layer. For the purpose of promoting uniform generation of manganese phosphate chemical conversion coating layer on steel pipe joints of various components and ensuring the lubrication effect after the resin coating layer is consumed for a long time, the nitriding layer by diffusion treatment is a manganese phosphate chemical conversion coating. It is provided as a base treatment layer for the layer. Therefore,
In order to obtain these actions and effects, the thickness of the underlying nitriding layer is limited to the range of 1 μm or more and 20 μm or less. If the thickness of the underlying nitriding layer is less than 1 μm, many defects are generated in the nitriding layer, so that the above effects are difficult to obtain, which is not preferable. On the other hand, when the thickness of the underlying nitriding layer exceeds 20 μm, the above-mentioned effects are saturated, and the hardness of the nitriding layer is rather high, which causes a change in the material of the steel pipe joint due to the increase in the thickness, which is not preferable. . Therefore, in the present invention, the thickness of the underlying nitriding layer is limited to the range of 1 to 20 μm, preferably 5 to 15 μm.
【００２４】図８は燐酸処理の膜厚と焼付きまでの摺動
距離との関係を示す図である。この図に示すように燐酸
マンガン系化成処理の厚さと樹脂被膜の厚さには、より
優れた耐焼付き性を発揮できる特定の傾向があり、化成
処理の厚さ以上に樹脂被膜を形成させることである。こ
の組合せが効果的な理由として、前述のサンドブラスト
の下地処理と同じメカニズムで化成処理を施した場合も
化成処理膜厚相当の凹凸が表面に現れていることが判っ
た。従って、選択的接触を防ぐ目的からも化成処理膜厚
以上に樹脂被膜をコーティングさせる必要がある。ま
た、燐酸系化成処理を施すことなく、表面粗さのみをサ
ンドブラストなどを設け、その粗さを樹脂被膜厚さ以下
にした場合もかなりの効果が得られるが、次に理由から
燐酸系化成処理を施した方が好ましい。FIG. 8 is a diagram showing the relationship between the film thickness of phosphoric acid treatment and the sliding distance until seizure. As shown in this figure, the manganese phosphate-based chemical conversion treatment thickness and the resin coating thickness have a specific tendency to exhibit better seizure resistance. Is. As a reason why this combination is effective, it was found that even when the chemical conversion treatment was performed by the same mechanism as the above-mentioned sandblasting surface treatment, irregularities corresponding to the chemical conversion treatment film thickness appeared on the surface. Therefore, for the purpose of preventing selective contact, it is necessary to coat the resin film more than the chemical conversion treatment film thickness. In addition, a considerable effect can be obtained even if the surface roughness is provided by sandblasting or the like without performing the phosphoric acid-based chemical conversion treatment, and the roughness is set to the resin coating film thickness or less. Is preferred.
【００２５】このように、下地処理を燐酸系化成処理層
に特定した理由として、サンドブラストなどの下地処理
に比べ、燐酸系化成処理は樹脂被膜との密着性の点で経
時劣化を起こしにくいことと、施工性上の問題である。
経時劣化について下地処理に燐酸マンガン系化成処理を
用いたものとサンドブラストを用いたものに同様の樹脂
被膜を形成し、水中に１ケ月浸漬後、密着状況を観察し
たところ、燐酸マンガン系化成処理をしたものには変化
がなかったものの、サンドブラストをしたものには樹脂
被膜の浮き上がりが観察されるものもあり、特に湿潤環
境下での保存及び使用に問題のあることが判った。施工
性の点ではサンドブラストを下地処理として用いた場
合、サンドブラスト後望ましくは３０分以内にコーティ
ング処理を行う必要があるが、製造現場ではライン構造
上、不可能な場合も多い。これに対して、燐酸マンガン
系化成処理の場合、処理後２週間放置後樹脂被膜を施し
ても実使用上問題のないことが確認された。As described above, the reason why the phosphoric acid-based chemical conversion treatment layer is specified as the base treatment is that the phosphoric acid-based chemical conversion treatment is less likely to deteriorate with time in terms of adhesion to the resin coating, as compared with the base treatment such as sandblasting. , It is a problem in terms of workability.
Deterioration over time A similar resin coating was formed on the base treatment using manganese phosphate chemical conversion treatment and the one using sandblasting, and after immersion in water for 1 month, the adhesion state was observed. Although there was no change in the treated ones, in some of the sandblasted ones, floating of the resin film was observed, and it was found that there was a problem in storage and use especially in a humid environment. In terms of workability, when sandblasting is used as the base treatment, it is necessary to perform the coating treatment within 30 minutes after sandblasting, but it is often impossible due to the line structure at the manufacturing site. On the other hand, in the case of manganese phosphate-based chemical conversion treatment, it was confirmed that there is no problem in practical use even if the resin coating is applied after standing for 2 weeks after the treatment.
【００２６】グリス潤滑を用いない場合のもう一つの劣
化性能として金属密封部のガスシール性がある。無潤滑
下でのガスシール性を評価するために継手に１０回の締
め緩めを繰り返した後、ＡＰＩ ＲＰ５Ｃ５の荷重条件
に則って、ガスシール性の評価を試みた。その結果、従
来グリス潤滑をしていた場合と同様の加工公差範囲内で
の評価試験でも継手はリークすることはなかった。これ
は耐焼付き性を確保するために形成した下地処理の膜厚
以上の樹脂膜厚により、実質上のシールを行う金属接触
部界面の凹凸が極めて滑らかになり、尚かつ相対する摺
動面との隙間にも樹脂が密封されるため、グリスを用い
なくても優れたシール機能が発揮できるものである。Another deterioration performance in the case where grease lubrication is not used is the gas sealing property of the metal sealing portion. In order to evaluate the gas sealability without lubrication, the joint was repeatedly tightened and loosened 10 times, and then the gas sealability was tried to be evaluated according to the load condition of API RP5C5. As a result, the joint did not leak even in the evaluation test within the processing tolerance range similar to the case where conventional grease lubrication was performed. This is because the resin film thickness that is more than the film thickness of the undercoating formed to secure seizure resistance makes the unevenness of the interface of the metal contact part that substantially seals extremely smooth, Since the resin is also sealed in the gap, the excellent sealing function can be achieved without using grease.
【００２７】図９は本発明に係る樹脂被膜の膜厚と燐酸
系化成処理被膜層の膜厚との関係を示す図である。本発
明の目的を達成する鋼管継手の表面状態としては、図９
に示すように、燐酸系化成処理被膜層５あるいは窒化処
理層と燐酸系化成処理被膜層の膜厚δM と、これら下地
処理層上に形成した二硫化モリブデン粉末を樹脂に分散
混合した樹脂被膜層６の膜厚δC とすると、δM ＜δC
の関係に成るように形成させることにある。すなわち、
樹脂被膜層の膜厚δC を燐酸系化成処理被膜層あるいは
窒化処理層と燐酸系化成処理被膜層の膜厚δM より大き
くする必要がある。これより小さい場合には、本発明の
目的である耐焼付き性を維持することができないばかり
か、シール性を維持することができなくなる。また、こ
の燐酸系化成処理被膜層の膜厚δM は前述した５〜３０
μｍ、樹脂被膜層の膜厚δC は１０〜４５μｍであるか
ら、この両者において常にδM ＜δCを保つ条件で形成
させる必要がある。FIG. 9 is a diagram showing the relationship between the film thickness of the resin film and the film thickness of the phosphoric acid-based chemical conversion treatment film layer according to the present invention. The surface condition of the steel pipe joint that achieves the object of the present invention is shown in FIG.
As shown in FIG. 5, a resin coating in which the film thickness δ M of the phosphoric acid-based chemical conversion coating layer 5 or the nitriding layer and the phosphoric acid-based chemical conversion coating layer, and molybdenum disulfide powder formed on these undercoat layers are dispersed and mixed in a resin. If the thickness of the layer 6 is δ C , then δ M <δ C
It is to form so that it may become a relationship of. That is,
The film thickness δ C of the resin coating layer must be larger than the film thickness δ M of the phosphoric acid-based chemical conversion coating layer or the nitriding layer and the phosphoric acid-based chemical conversion coating layer. If it is smaller than this, not only the seizure resistance, which is the object of the present invention, cannot be maintained, but also the sealing property cannot be maintained. The thickness δ M of the phosphoric acid-based chemical conversion treatment coating layer is 5 to 30 described above.
μm, and the film thickness δ C of the resin coating layer is 10 to 45 μm. Therefore, it is necessary to form them both under the condition that δ M <δ C is always maintained.
【００２８】次に、継手の金属接触部の耐焼付き性を向
上させる方法に接触界面を意識的に機械加工により粗く
したり、あるいはサンドブラストを施し、他の表面処理
を用いずに耐焼付き性を向上させることは一般に用いら
れている手段でコンパウンドグリスを塗布した環境下で
は一定の効果を上げてきた。しかし、この摺動相手材の
表面性状の効果をグリス無潤滑下で評価したものはな
く、ここにグリス無潤滑下での銅メッキを施した母材に
対してサンドブラストにより表面をＲmax ＝３０μｍに
処理したピンを締め緩めを繰り返した場合の結果を図１
０に示す。すなわち、図１０は摺動相手材にサンドブラ
ストを施した場合の各種表面処理とゴーリング発生時の
回数との関係を示す図で、この図に示すように、摺動相
手材の表面にサンドブラストを施した方が耐焼付き性が
劣化することが判る。この理由として、表面を粗くする
ことの効果は表面を粗くすることにより接触界面に隙間
を設け、その隙間にコンパウンドグリスを封入し、潤滑
効果を向上させることにあるわけで、グリス無潤滑下で
はこの効果がないばかりか、唯一の耐焼付き性の機能を
有する表面処理をサンドブラストの凹凸により損耗させ
てしまうからである。Next, in order to improve the seizure resistance of the metal contact portion of the joint, the contact interface is intentionally roughened by machining or sandblasted so that seizure resistance can be obtained without using any other surface treatment. The improvement has achieved a certain effect under the environment in which the compound grease is applied by a commonly used means. However, there is no evaluation of the effect of the surface properties of this sliding mating material under grease-free lubrication, and the surface of the base material plated with copper under grease-free lubrication is sandblasted to R max = 30 μm. Fig. 1 shows the results of repeated tightening and loosening of the pins treated in
0 is shown. That is, FIG. 10 is a diagram showing the relationship between various surface treatments and the number of times of occurrence of galling when the sliding mating material is sandblasted. As shown in this figure, the surface of the sliding mating material is sandblasted. It can be seen that the seizure resistance is deteriorated by doing so. The reason for this is that the effect of roughening the surface is to create a gap at the contact interface by roughening the surface and to fill the gap with compound grease to improve the lubrication effect. This is because not only this effect is absent, but also the surface treatment having the sole function of seizure resistance is abraded by the unevenness of the sandblast.
【００２９】図１１は本発明に係る樹脂被膜の膜厚と燐
酸系化成処理被膜層の膜厚及び相対する摺動面の表面粗
さとの関係を示す図である。本発明の目的を達成するた
めの第２の発明であって、図１１に示すように、燐酸系
化成処理被膜層５あるいた窒化処理層と燐酸系化成処理
被膜層の膜厚δM とこれら下地処理層上に形成した二硫
化モリブデン粉末を樹脂に分散混合した樹脂被膜層６の
膜厚δC との間に、δ M ＜δC の関係があり、かつ、相
対する摺動面７の表面粗さＲmax とするとＲma x ＜δC
の関係が成り立つようにＲmax を決めることにある。す
なわち、相対する摺動面の表面粗さＲmax が樹脂被膜層
の膜厚δC より大きいと本発明においては、グリス又は
液体潤滑剤がないことからリークを起こし、本発明の目
的を達成することができない。また、この表面粗さＲ
max は１〜２５μｍの範囲とする。１μｍ未満では継手
の生産効率に影響を与えるためで、また、２５μｍを越
えると潤滑剤が無いために焼付けを起し、シール性を劣
化させる。従って、相対する摺動面の表面粗さＲmax は
１〜２５μｍの範囲が望ましい。その作用、効果を図１
２及び図１３に示す。FIG. 11 shows the film thickness and phosphorus content of the resin coating according to the present invention.
Thickness of acid-based chemical conversion coating layer and surface roughness of opposite sliding surface
It is a figure which shows the relationship with. To achieve the object of the present invention
As shown in FIG. 11, a phosphoric acid-based
Chemical conversion treatment coating layer 5 and nitriding treatment layer and phosphoric acid chemical conversion treatment
Film thickness δMAnd disulfide formed on these undercoat layers
Of the resin coating layer 6 in which molybdenum bromide powder is dispersed and mixed in the resin
Film thickness δCBetween and M<ΔCRelationship and
Surface roughness R of sliding surface 7 againstmaxThen Rma x<ΔC
So that the relationship ofmaxIs to decide. You
That is, the surface roughness R of the opposing sliding surfacesmaxIs a resin coating layer
Film thickness δCIf it is larger, in the present invention, grease or
The lack of liquid lubricant causes a leak,
Cannot achieve the target. Also, this surface roughness R
maxIs in the range of 1 to 25 μm. If it is less than 1 μm
This will affect the production efficiency of the
However, since there is no lubricant, it will cause baking, resulting in poor sealing performance.
Turn into Therefore, the surface roughness R of the opposing sliding surfacesmaxIs
The range of 1 to 25 μm is desirable. Figure 1 shows its action and effect.
2 and FIG.
【００３０】図１２は本発明に係る樹脂膜厚みと表面粗
さにおける耐焼付き性との関係を示す図である。すなわ
ち、燐酸マンガン系化成処理を下地処理に二硫化モリブ
デンをポリアミドイミド樹脂に分散混合した場合の初期
の樹脂被膜厚と１０回の締め緩め後の樹脂被膜厚を示し
たものである。相対する摺動面の表面粗さが粗いほど残
存膜厚が小さくなり、耐焼付き性が劣化することが判
る。図１３は相対する摺動面粗さでのメーク・ブレーク
回数と樹脂被膜厚みの減少過程を示す図で、締め緩めを
繰り返したときの樹脂膜厚の減少過程を示している。こ
の図より、総損耗量が相対する摺動面の粗さと同等にな
るあたりから、損耗は減少する傾向にある。従って、耐
焼付き性を安定的に得るには樹脂被膜の膜厚を相対する
摺動面の粗さ以上に設計する必要がある。FIG. 12 is a diagram showing the relationship between the resin film thickness and the seizure resistance of the surface roughness according to the present invention. That is, it shows the initial resin film thickness and the resin film thickness after ten times of tightening and loosening when molybdenum disulfide was dispersed and mixed in the polyamideimide resin with the manganese phosphate chemical conversion treatment as the base treatment. It can be seen that the rougher the surface roughness of the opposing sliding surfaces, the smaller the remaining film thickness and the lower the seizure resistance. FIG. 13 is a diagram showing the number of make breaks and the process of reducing the thickness of the resin coating film at the opposite sliding surface roughness, and shows the process of reducing the resin film thickness when tightening and loosening are repeated. From this figure, the wear tends to decrease when the total wear becomes equal to the roughness of the opposite sliding surfaces. Therefore, in order to obtain stable seizure resistance, it is necessary to design the film thickness of the resin film to be equal to or larger than the roughness of the sliding surfaces facing each other.
【００３１】更に、二硫化モリブデンを唯一の分散粒子
とした樹脂被膜を用いることはグリス潤滑無しの場合、
必須条件であったが、係る分散粒子を用いた場合の弊害
としてＳが水分中などの水素と結び付き、硫化水素を生
成し、特に母材が高強度の場合、硫化物応力腐食割れを
誘発すると言うものである。このような問題に対処する
ために、樹脂中に２−ポリメリクリンセード，１−トリ
エチレントリアミノイミダゾリン（２−ｐｏｌｙｍｅｒ
ｉｃｌｉｎｓｅｅｄ，１−ｔｒｉｅｔｈｙｌｅｎｅｔｒ
ｉａｍｉｎｏｉｍｉｄａｚｏｌｉｎｅ）などの腐食抑制
剤を分散させることで耐焼付き性を維持したまま硫化物
応力腐食割れを防止することができるものである。Further, the use of a resin coating containing molybdenum disulfide as the only dispersed particle is effective in the case of no grease lubrication.
Although it was an essential condition, as a harmful effect when such dispersed particles are used, S is bound to hydrogen in water or the like to generate hydrogen sulfide, and particularly when the base material has high strength, sulfide stress corrosion cracking is induced. It is something to say. In order to deal with such a problem, 2-polymeric clinsade, 1-triethylenetriaminoimidazoline (2-polymer) is contained in a resin.
iclinseed, 1-triethylenetr
By dispersing a corrosion inhibitor such as iainoimidazoline, it is possible to prevent sulfide stress corrosion cracking while maintaining seizure resistance.
【００３２】[0032]
【実施例】鋼管の継手部分である図１に示す継手部材で
あるボックスとピンについて、それぞれの継手部材を構
成するネジ部および金属ー金属接触部に対して、下地処
理としてボックスの接触界面に燐酸マンガン系化成処理
被膜層または下地窒化処理層と燐酸マンガン系化成処理
被膜層ないしはサンドブラスト処理を行い、樹脂被膜と
して二硫化モリブデンとポリアミドイミド樹脂、エポキ
シ系樹脂及びフラン系樹脂を所定の組成比で構成された
固体潤滑剤を塗布し、樹脂被膜の膜厚を変えて設けた。
また、相対する摺動面の粗さを変えたときのゴーリング
発生回数を表１に示す。その結果、表１に示すように、
最高２０回までのグリス潤滑を伴わない実継手の締め緩
め試験で本発明の効果の高いことを明確に現している。
このようにグリス無潤滑下では摺動面のやすり効果が顕
著に現れるため、二硫化モリブデンを樹脂に分散混合さ
せた樹脂被膜を用いる場合、樹脂被膜厚を下地処理の膜
厚以上に形成すると同時に相対する摺動面の面粗さを前
述したように樹脂被膜厚以下に形成させる必要がある。EXAMPLE For a box and a pin which are joint members shown in FIG. 1 which are joint portions of a steel pipe, the contact interface of the box is treated as a base treatment with respect to a screw portion and a metal-metal contact portion constituting each joint member. Manganese phosphate chemical conversion treatment coating layer or underlying nitriding treatment layer and manganese phosphate chemical conversion treatment coating layer or sandblast treatment is performed, and molybdenum disulfide and polyamideimide resin, epoxy resin and furan resin are used as resin coatings at a predetermined composition ratio. The formed solid lubricant was applied and the film thickness of the resin film was changed and provided.
Further, Table 1 shows the number of times of occurrence of goring when the roughness of the opposing sliding surfaces is changed. As a result, as shown in Table 1,
It has been clearly shown that the effect of the present invention is high in the tightening and loosening test of the actual joint up to 20 times without grease lubrication.
In this way, since the filing effect of the sliding surface remarkably appears under no grease lubrication, when using a resin coating in which molybdenum disulfide is dispersed and mixed in the resin, at the same time as forming the resin coating film thickness equal to or more than the film thickness of the base treatment. It is necessary to form the surface roughness of the opposing sliding surfaces to be equal to or less than the resin film thickness as described above.
【００３３】[0033]
【表１】 [Table 1]
【００３４】[0034]
【発明の効果】以上述べたように、本発明によるネジ継
手は、ボックスまたはピンの接触表面に燐酸系化成処理
被膜層あるいは窒化処理層と燐酸系化成処理被膜層を設
け、この燐酸系化成処理被膜層上に樹脂被膜層を形成
し、この樹脂被膜の膜厚を燐酸系化成処理被膜の膜厚以
上とするか、また、更に加えて、この樹脂被膜の膜厚を
相対する摺動面の表面粗さ以上としたことにより、従来
において継手メークアップ前に塗布していたコンパウン
ドグリスなどの液体潤滑剤を一切使用することなく繰り
返しの締め、緩めに対してゴーリングを起こすことな
く、かつシール性等の使用性能も満足することが出来る
極めて優れた管ネジ継手を得ることができる。As described above, in the threaded joint according to the present invention, a phosphoric acid type chemical conversion treatment coating layer or a nitriding treatment layer and a phosphoric acid type chemical conversion treatment coating layer are provided on the contact surface of the box or the pin, and the phosphoric acid type chemical conversion treatment layer is formed. A resin film layer is formed on the film layer, and the film thickness of this resin film is made equal to or larger than the film thickness of the phosphoric acid chemical conversion treatment film. By making the surface roughness more than that, without using any liquid lubricant such as compound grease that was conventionally applied before making up the joints, there is no galling for repeated tightening and loosening, and the sealing property is good. It is possible to obtain an extremely excellent pipe threaded joint that can satisfy the usage performances such as.
【図１】本発明を適用した継手構成部材の概略図、FIG. 1 is a schematic view of a joint component member to which the present invention is applied,
【図２】各継手構成部材の組立構成を示す図、FIG. 2 is a diagram showing an assembly configuration of each joint component member;
【図３】各種表面処理とゴーリング発生時の回数との関
係を示す図、FIG. 3 is a diagram showing a relationship between various surface treatments and the number of times of occurrence of goring,
【図４】本発明での試験の概要を示す図、FIG. 4 is a diagram showing an outline of a test in the present invention,
【図５】分散メッキによる表面被膜の種類と焼付きまで
の摺動距離との関係を示す図、FIG. 5 is a diagram showing the relationship between the type of surface coating by dispersion plating and the sliding distance until seizure,
【図６】各種樹脂に二硫化モリブデン粉末を分散混合さ
せた被膜と焼付きまでの摺動距離との関係を示す図、FIG. 6 is a diagram showing a relationship between a coating film in which molybdenum disulfide powder is mixed and mixed with various resins and a sliding distance until seizure,
【図７】各種下地処理した場合の樹脂に二硫化モリブデ
ン粉末を分散混合させた表面被膜と焼付きまでの摺動距
離との関係を示す図、FIG. 7 is a diagram showing a relationship between a surface coating in which molybdenum disulfide powder is mixed and dispersed in a resin and a sliding distance until seizure in the case where various kinds of base treatments are performed,
【図８】燐酸系化成処理の膜厚と焼付きまでの摺動距離
との関係を示す図、FIG. 8 is a diagram showing a relationship between a film thickness of phosphoric acid-based chemical conversion treatment and a sliding distance until seizure,
【図９】本発明に係る樹脂被膜の膜厚と燐酸系化成処理
被膜層の膜厚との関係を示す図FIG. 9 is a diagram showing the relationship between the film thickness of a resin film and the film thickness of a phosphoric acid-based chemical conversion treatment film layer according to the present invention.
【図１０】摺動相手材にサンドブラストを施した場合の
各種表面処理とゴーリング発生時の回数との関係を示す
図、FIG. 10 is a diagram showing the relationship between various surface treatments and the number of times of occurrence of galling when the sliding mating material is sandblasted;
【図１１】本発明に係る樹脂被膜の膜厚と燐酸系化成処
理被膜層の膜厚及び相対する摺動面の表面粗さとの関係
を示す図、FIG. 11 is a diagram showing the relationship between the film thickness of the resin film according to the present invention, the film thickness of the phosphoric acid-based chemical conversion treatment film layer, and the surface roughness of the opposing sliding surface,
【図１２】本発明に係る樹脂被膜厚みと表面粗さにおけ
る耐焼付き性との関係を示す図、FIG. 12 is a diagram showing the relationship between the resin coating thickness and the seizure resistance of the surface roughness according to the present invention;
【図１３】相対する摺動面粗さでのメーク・ブレーク回
数と樹脂被膜厚みの減少過程を示す図である。FIG. 13 is a diagram showing a process of decreasing the number of make breaks and the thickness of a resin coating film at the opposing sliding surface roughness.
１ ボックス ２ ピン ３ ネジ部 ４ 金属接触部 ５ 燐酸系化成処理被膜層 ６ 樹脂被膜層 ７ 相対する摺動面 特許出願人 新日本製鐵株式会社 他１名代理人 弁
理士 椎 名 彊1 box 2 pin 3 screw part 4 metal contact part 5 phosphoric acid type chemical conversion treatment coating layer 6 resin coating layer 7 opposite sliding surface patent applicant Shin Nippon Steel Co., Ltd. and other 1 agent attorney attorney Shiina Yui
───────────────────────────────────────────────────── フロントページの続き (72)発明者 永吉 治之 福岡県北九州市戸畑区飛幡町１番１号 新 日本製鐵株式会社八幡製鐵所内 (72)発明者 中島 晃 福岡県北九州市戸畑区飛幡町１番１号 新 日本製鐵株式会社八幡製鐵所内 (72)発明者 樋口 征順 福岡県北九州市戸畑区沢見一丁目７−５− 208 (72)発明者 井上 隆介 福岡県北九州市小倉北区熊谷２−28−12 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Haruyuki Nagayoshi, Inventor Haruyuki Nagayoshi 1-1, Toibata-cho, Tobata-ku, Kitakyushu, Fukuoka (72) Inventor, Akira Nakajima Aiba, Tobata-ku, Kitakyushu, Fukuoka No. 1 No. 1 Shin-Nippon Steel Co., Ltd. Yawata Works (72) Inventor Seijun Higuchi 7-5-208 Sawami, Tobata-ku, Kitakyushu City, Fukuoka Prefecture (72) Ryusuke Inoue Kokurakita, Kitakyushu City, Fukuoka Prefecture 2-28-12, Kumagaya, Ward
Claims (5)
ンと雌ネジとネジなし金属接触部からなるボックスから
構成される管のネジ継手において、ボックスまたはピン
の接触表面に、燐酸系化成処理被膜層あるいは窒化処理
層と燐酸系化成処理被膜層を設けると共に、二硫化モリ
ブデン粉末を樹脂に分散混合した樹脂被膜層を該燐酸系
化成処理被膜層上に形成し、前記樹脂被膜の膜厚を該燐
酸系化成処理被膜層の膜厚以上としたピン、ボックス螺
合時にグリス及び液体潤滑剤なしの無潤滑下での耐焼付
き性に優れたネジ継手。1. A threaded joint for a pipe, which comprises a pin consisting of a male screw and a metal contact without a screw and a box consisting of a female screw and a metal contact without a screw, wherein the contact surface of the box or the pin is a phosphoric acid type chemical conversion coating. A layer or a nitriding layer and a phosphoric acid-based chemical conversion coating layer, a resin coating layer in which molybdenum disulfide powder is dispersed and mixed in a resin is formed on the phosphoric acid-based chemical conversion coating layer, and the thickness of the resin coating is A threaded joint with excellent seizure resistance under no lubrication without grease and liquid lubricant when screwing pins and boxes that are thicker than the phosphoric acid-based chemical conversion coating layer.
ンと雌ネジとネジなし金属接触部からなるボックスから
構成される管のネジ継手において、ボックスまたはピン
の接触表面に、燐酸系化成処理被膜層あるいは窒化処理
層と燐酸系化成処理被膜層を設けると共に、二硫化モリ
ブデン粉末を樹脂に分散混合した樹脂被膜層を該燐酸系
化成処理被膜層上に形成し、前記樹脂被膜の膜厚を該燐
酸系化成処理被膜層の膜厚以上とし、かつ相対する摺動
面の表面粗さを前記樹脂被膜層の厚さより小さくし、ピ
ン、ボックス螺合時にグリス及び液体潤滑剤なしの無潤
滑下での耐焼付き性に優れたネジ継手。2. In a threaded joint of a pipe comprising a pin consisting of a male screw and a metal contact portion without a screw and a box consisting of a female screw and a metal contact portion without a screw, a phosphoric acid type chemical conversion coating on the contact surface of the box or the pin. A layer or a nitriding layer and a phosphoric acid-based chemical conversion coating layer, a resin coating layer in which molybdenum disulfide powder is dispersed and mixed in a resin is formed on the phosphoric acid-based chemical conversion coating layer, and the thickness of the resin coating is Not less than the thickness of the phosphoric acid-based chemical conversion treatment coating layer, and the surface roughness of the opposing sliding surface is smaller than the thickness of the resin coating layer, and without lubrication without grease and liquid lubricant when screwing pins and boxes. A screw joint with excellent seizure resistance.
ンと雌ネジとネジなし金属接触部からなるボックスから
構成される管のネジ継手において、ボックスまたはピン
の接触表面に、厚さ５〜３０μｍの燐酸系化成処理被膜
層あるいは厚さ１〜２０μｍの窒化処理層と厚さ５〜３
０μｍの燐酸系化成処理被膜層を設けると共に、二硫化
モリブデン粉末を樹脂に、０．２≦｛（二硫化モリブデ
ン粉末）の含有量｝／｛（樹脂）の含有量｝≦９の割合
に分散混合した樹脂被膜層を該燐酸系化成処理被膜層上
に厚さ１０〜４５μｍに形成し、前記樹脂被膜の膜厚を
該燐酸系化成処理被膜層の膜厚以上としたピン、ボック
ス螺合時にグリス及び液体潤滑剤なしの無潤滑下での耐
焼付き性に優れたネジ継手。3. A threaded joint for a pipe, which comprises a pin consisting of a male screw and a metal contact portion without a screw and a box consisting of a female screw and a metal contact portion without a screw, and a thickness of 5 to 30 μm on the contact surface of the box or the pin. Phosphoric acid-based chemical conversion coating layer or nitriding layer having a thickness of 1 to 20 μm and a thickness of 5 to 3
A phosphoric acid-based chemical conversion treatment coating layer of 0 μm is provided, and molybdenum disulfide powder is dispersed in the resin in a ratio of 0.2 ≦ {(molybdenum disulfide powder) content / {(resin) content} ≦ 9. A mixed resin coating layer is formed on the phosphoric acid-based chemical conversion treatment coating layer to a thickness of 10 to 45 μm, and the resin coating film has a thickness equal to or greater than the thickness of the phosphoric acid-based chemical conversion treatment coating layer, at the time of screwing a pin or a box. Screw joint with excellent seizure resistance under no lubrication without grease and liquid lubricant.
ンと雌ネジとネジなし金属接触部からなるボックスから
構成される管のネジ継手において、ボックスまたはピン
のいずれか一方の接触表面に、厚さ５〜３０μｍの燐酸
系化成処理被膜層、あるいは厚さ１〜２０μｍの窒化処
理層と厚さ５〜３０μｍの燐酸系化成処理被膜層を設け
ると共に、二硫化モリブデン粉末を樹脂に、０．２≦
｛（二硫化モリブデン粉末）の含有量｝／｛（樹脂）の
含有量｝≦９の割合に分散混合した樹脂被膜層を該燐酸
系化成処理被膜層上に厚さ１０〜４５μｍに形成し、前
記樹脂被膜の膜厚を該燐酸系化成処理被膜層の膜厚以上
とし、かつ相対する摺動面の表面粗さを前記樹脂被膜層
の厚さより小さくし、ピン、ボックス螺合時にグリス及
び液体潤滑剤なしの無潤滑下での耐焼付き性に優れたネ
ジ継手。4. A threaded joint for a pipe, which comprises a pin consisting of a male screw and a metal contact without a screw and a box consisting of a female screw and a metal contact without a screw, wherein the contact surface of either the box or the pin is thick. A phosphoric acid-based chemical conversion treatment coating layer having a thickness of 5 to 30 μm, or a nitriding treatment layer having a thickness of 1 to 20 μm and a phosphoric acid chemical conversion treatment coating layer having a thickness of 5 to 30 μm are provided, and molybdenum disulfide powder is added to the resin in an amount of 0.2 ≤
A resin coating layer dispersed and mixed in a ratio of {content of (molybdenum disulfide powder)} / {content of (resin)} ≦ 9 is formed to a thickness of 10 to 45 μm on the phosphoric acid-based chemical conversion coating layer, The film thickness of the resin film is made equal to or larger than the film thickness of the phosphoric acid-based chemical conversion treatment film layer, and the surface roughness of the opposing sliding surface is made smaller than the film thickness of the resin film layer, and grease and a liquid are used when the pin and the box are screwed. A screw joint with excellent seizure resistance without lubrication and without lubrication.
分散混合したことを特徴とする無潤滑下での耐焼付き性
に優れたネジ継手。5. A threaded joint excellent in seizure resistance under non-lubrication, characterized in that a corrosion inhibitor is dispersed and mixed in the resin according to any one of claims 1 to 4.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4324695A JPH08233164A (en) | 1995-03-02 | 1995-03-02 | Screw joint excellent in seizure resistance with no lubricant applied |
| DE1995627635 DE69527635T4 (en) | 1994-10-04 | 1995-10-04 | STEEL TUBE CLUTCH WITH INCREASED ABRASION SAFETY AND METHOD FOR SURFACE TREATMENT |
| US08/809,344 US6027145A (en) | 1994-10-04 | 1995-10-04 | Joint for steel pipe having high galling resistance and surface treatment method thereof |
| PCT/JP1995/002034 WO1996010710A1 (en) | 1994-10-04 | 1995-10-04 | Steel pipe joint having high galling resistance and surface treatment method thereof |
| EP95933616A EP0786616B9 (en) | 1994-10-04 | 1995-10-04 | Steel pipe joint having high galling resistance and surface treatment method thereof |
| CN95195507A CN1159851A (en) | 1994-10-04 | 1995-10-04 | Steel pipe joint having high galling resistance and surface treatment method thereof |
| NO19971523A NO328656B1 (en) | 1994-10-04 | 1997-04-03 | Stalror compound with high demolition resistance, as well as method of surface treatment thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4324695A JPH08233164A (en) | 1995-03-02 | 1995-03-02 | Screw joint excellent in seizure resistance with no lubricant applied |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08233164A true JPH08233164A (en) | 1996-09-10 |
Family
ID=12658536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4324695A Pending JPH08233164A (en) | 1994-10-04 | 1995-03-02 | Screw joint excellent in seizure resistance with no lubricant applied |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08233164A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6659509B2 (en) | 2001-04-11 | 2003-12-09 | Sumitomo Metal Industries, Ltd. | Threaded joint for steel pipes |
| WO2003102457A1 (en) | 2002-05-31 | 2003-12-11 | Sumitomo Metal Industries, Ltd. | Screw joint for steel pipe |
| US6679526B2 (en) | 1999-08-27 | 2004-01-20 | Sumitomo Metal Industries, Ltd. | Threaded joint for an oil well pipe |
| US6746057B2 (en) | 2001-01-25 | 2004-06-08 | Sumitomo Metal Industries, Ltd. | Threaded joint for steel pipes having improved galling resistance and rust-preventing properties |
| US6827996B2 (en) | 2001-04-11 | 2004-12-07 | Sumitomo Metal Industries, Ltd. | Threaded joint for steel pipes and process for the surface treatment thereof |
| US6869111B2 (en) | 2000-12-04 | 2005-03-22 | Sumitomo Metal Industries, Ltd. | Lubricating coating composition suitable for lubrication of a threaded joint |
| WO2005098300A1 (en) | 2004-04-06 | 2005-10-20 | Sumitomo Metal Industries, Ltd. | Threaded joint for steel pipe and process for producing the same |
| WO2007091054A1 (en) * | 2006-02-08 | 2007-08-16 | Thomas John Oliver Thornton | Improvements in and relating to downhole tools |
| JP2008069883A (en) * | 2006-09-14 | 2008-03-27 | Sumitomo Metal Ind Ltd | Steel pipe screw joint |
| JP2009517614A (en) * | 2005-11-30 | 2009-04-30 | テナリス・コネクシヨンズ・アクチエンゲゼルシヤフト | Screw connection with high and low friction coating |
| JP2010164069A (en) * | 2009-01-13 | 2010-07-29 | Daido Metal Co Ltd | Slide member |
| US7770935B2 (en) | 2005-01-13 | 2010-08-10 | Sumitomo Metal Industries, Ltd. | Threaded joint for steel pipes |
| CN103470912A (en) * | 2013-09-16 | 2013-12-25 | 西安长庆图博可特石油管道涂层有限公司 | Anti-corrosion ring and application method thereof |
-
1995
- 1995-03-02 JP JP4324695A patent/JPH08233164A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6679526B2 (en) | 1999-08-27 | 2004-01-20 | Sumitomo Metal Industries, Ltd. | Threaded joint for an oil well pipe |
| US6869111B2 (en) | 2000-12-04 | 2005-03-22 | Sumitomo Metal Industries, Ltd. | Lubricating coating composition suitable for lubrication of a threaded joint |
| US6746057B2 (en) | 2001-01-25 | 2004-06-08 | Sumitomo Metal Industries, Ltd. | Threaded joint for steel pipes having improved galling resistance and rust-preventing properties |
| EP1892449A1 (en) | 2001-04-11 | 2008-02-27 | Sumitomo Metal Industries, Ltd. | Threaded joint for steel pipes |
| US6827996B2 (en) | 2001-04-11 | 2004-12-07 | Sumitomo Metal Industries, Ltd. | Threaded joint for steel pipes and process for the surface treatment thereof |
| US6659509B2 (en) | 2001-04-11 | 2003-12-09 | Sumitomo Metal Industries, Ltd. | Threaded joint for steel pipes |
| EP2154406A1 (en) | 2001-04-11 | 2010-02-17 | Sumitomo Metal Industries, Ltd. | Threaded joint for steel pipes and process for the surface treatment thereof |
| WO2003102457A1 (en) | 2002-05-31 | 2003-12-11 | Sumitomo Metal Industries, Ltd. | Screw joint for steel pipe |
| US7360798B2 (en) | 2002-05-31 | 2008-04-22 | Sumitomo Metal Industries, Ltd. | Threaded joint for steel pipes |
| WO2005098300A1 (en) | 2004-04-06 | 2005-10-20 | Sumitomo Metal Industries, Ltd. | Threaded joint for steel pipe and process for producing the same |
| US7866706B2 (en) | 2004-04-06 | 2011-01-11 | Sumitomo Metal Industries, Ltd. | Threaded joint for steel pipe |
| US7770935B2 (en) | 2005-01-13 | 2010-08-10 | Sumitomo Metal Industries, Ltd. | Threaded joint for steel pipes |
| JP2009517614A (en) * | 2005-11-30 | 2009-04-30 | テナリス・コネクシヨンズ・アクチエンゲゼルシヤフト | Screw connection with high and low friction coating |
| WO2007091054A1 (en) * | 2006-02-08 | 2007-08-16 | Thomas John Oliver Thornton | Improvements in and relating to downhole tools |
| US7918274B2 (en) | 2006-02-08 | 2011-04-05 | Thomas John Oliver Thornton | Downhole tools |
| JP2008069883A (en) * | 2006-09-14 | 2008-03-27 | Sumitomo Metal Ind Ltd | Steel pipe screw joint |
| JP2010164069A (en) * | 2009-01-13 | 2010-07-29 | Daido Metal Co Ltd | Slide member |
| CN103470912A (en) * | 2013-09-16 | 2013-12-25 | 西安长庆图博可特石油管道涂层有限公司 | Anti-corrosion ring and application method thereof |
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