Threaded joint for steel pipes

F - Mech Eng,Light,Heat,Weapons – 16 – L

Patent

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Details

F16L 15/04 (2006.01) C23C 24/04 (2006.01) F16B 33/06 (2006.01)

Patent

CA 2592730

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.

La présente invention concerne un joint fileté pour des tuyaux en acier, comprenant une tige (1) et une boîte (2) qui présentent chacun une partie filetée (3a ou 3b) et une partie de contact métal-métal non filetée (4a ou 4b) en tant que surfaces de contact qui viennent en contact lorsque le joint est fixé. Ces surfaces de contact (3a et 4a et/ou 3b et 4b) de la tige (1) et/ou de la boîte (2) sont revêtues d'une couche inférieure d'un revêtement de lubrifiant solide qui contient une poudre de lubrifiant solide (par ex. du disulfure de molybdène, de disulfure de tungstène ou du graphite) et un liant (par ex. une résine époxy ou une autre résine organique), ainsi que d'une couche supérieure d'un revêtement anticorrosion solide qui est constitué d'une résine organique ne contenant pas de particule solide.

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