Invention Grant
- Patent Title: Oil well pipe with threaded joint
- Patent Title (中): 油井管螺纹接头
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Application No.: US13050135Application Date: 2011-03-17
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Publication No.: US08741406B2Publication Date: 2014-06-03
- Inventor: Kunio Goto , Ryuichi Imai
- Applicant: Kunio Goto , Ryuichi Imai
- Applicant Address: JP Tokyo FR Aulnoye-Aymeries
- Assignee: Nippon Steel & Sumitomo Metal Corporation,Vallourec Mannesmann Oil & Gas France
- Current Assignee: Nippon Steel & Sumitomo Metal Corporation,Vallourec Mannesmann Oil & Gas France
- Current Assignee Address: JP Tokyo FR Aulnoye-Aymeries
- Agency: Clark & Brody
- Main IPC: B29C47/00
- IPC: B29C47/00 ; F16L7/00

Abstract:
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 metal contact 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.
Public/Granted literature
- US20110163538A1 THREADED JOINT FOR STEEL PIPES Public/Granted day:2011-07-07
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