发明名称 |
THREADED JOINT FOR STEEL PIPES |
摘要 |
A threaded joint for steel pipes for use in an oil well which has improved galling resistance and which is protected from rusting comprises a pin and a box each having a contact surface including a threaded portion and an unthreaded metalcontact portion. The contact surface of at least one of the pin and the box has a lower layer of a viscous liquid or semisolid lubricating coating comprising at least wax and a fatty acid alkaline earth metal salt and not containing a harmful heavy metal such as lead and an upper layer of a dry solid coating formed from an aqueous resin coating composition, an organic solvent type coating composition, or an ultraviolet curing coating composition.
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申请公布号 |
CA2602417(C) |
申请公布日期 |
2011.05.24 |
申请号 |
CA20062602417 |
申请日期 |
2006.03.29 |
申请人 |
SUMITOMO METAL INDUSTRIES, LTD.;VALLOUREC MANNESMANN OIL & GAS FRANCE |
发明人 |
GOTO, KUNIO;IMAI, RYUICHI |
分类号 |
F16L15/04 |
主分类号 |
F16L15/04 |
代理机构 |
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