Invention Grant
- Patent Title: Threaded joint for steel pipes
- Patent Title (中): 钢管螺纹接头
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Application No.: US11329159Application Date: 2006-01-11
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Publication No.: US07770935B2Publication Date: 2010-08-10
- Inventor: Ryuichi Imai , Kunio Goto , Kaoru Takanashi , Yasuhiro Ogawa
- Applicant: Ryuichi Imai , Kunio Goto , Kaoru Takanashi , Yasuhiro Ogawa
- Applicant Address: JP Osaka FR Aulnoye-Aymeries
- Assignee: Sumitomo Metal Industries, Ltd.,Vallourec Mannesmann Oil & Gas France
- Current Assignee: Sumitomo Metal Industries, Ltd.,Vallourec Mannesmann Oil & Gas France
- Current Assignee Address: JP Osaka FR Aulnoye-Aymeries
- Agency: Clark & Brody
- Main IPC: F16L21/00
- IPC: F16L21/00

Abstract:
A threaded joint for steel pipes comprises a pin (1) and a box (2) each having a threaded portion (3a or 3b) and an unthreaded metal-to-metal contact portion (4a or 4b) as contact surfaces which contact each other when the joint is fastened. The contact surfaces (3a and 4a and/or 3b and 4b) of at least one of the pin (1) and the box (2) are coated with a lower layer of a solid lubricating coating containing a solid lubricating powder (e.g., molybdenum disulfide, tungsten disulfide, or graphite) and a binder (e.g., an epoxy or other organic resin) and an upper layer of a solid corrosion protective coating formed by an organic resin which does not contain solid particles.
Public/Granted literature
- US20060197343A1 Threaded joint for steel pipes Public/Granted day:2006-09-07
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