THREADED JOINT FOR STEEL PIPES
    70.
    发明专利

    公开(公告)号:CA2592730C

    公开(公告)日:2009-09-01

    申请号:CA2592730

    申请日:2006-01-11

    Abstract: A threaded joint for steel pipes comprises a pin (1) and a box (2) each havi ng a threaded portion (3a or 3b) and an unthreaded metal-to-metal contact porti on (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.

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