发明名称 |
Threaded joint for an oil well pipe |
摘要 |
A threaded joint for an oil well pipe is provided which prevents the occurrence of galling at the time of repeated tightening and loosening and which provides a high degree of air tightness and has excellent galling resistance and air tightness without using a liquid lubricant such as a compound grease.1. A lubricating film of an inorganic polymeric compound which has an M (metal element)-O (oxygen) backbone and has a solid lubricant dispersed therein is formed on a threaded portion or an unthreaded metal contact portion.2. A phosphate film and the lubricating film of the inorganic polymeric compound is formed on the threaded portion or the unthreaded metal contact portion.3. A Cu plating layer and the lubricating film of the inorganic polymeric compound or a lubricating film of a resin in which a solid lubricant is dispersed is formed on the threaded portion or the unthreaded metal contact portion.4. A lubricating film of the inorganic polymeric compound or a lubricating film of the polymer and a rust preventing film containing an alkali metal salt of a carboxylic acid or an alkali earth metal salt of a carboxylic acid are formed on the threaded portion or the unthreaded metal contact portion.
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申请公布号 |
US6679526(B2) |
申请公布日期 |
2004.01.20 |
申请号 |
US20020082212 |
申请日期 |
2002.02.26 |
申请人 |
SUMITOMO METAL INDUSTRIES, LTD. |
发明人 |
YAMAMOTO HIDEO;NAKASUJI KAZUYUKI |
分类号 |
C23C28/00;C23C30/00;E21B17/042;F16L15/00;F16L15/04;F16L58/18;(IPC1-7):F16L15/04;C23C26/00 |
主分类号 |
C23C28/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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