Threaded joint for steel pipe

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

Patent

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Details

F16L 15/00 (2006.01) F16L 15/04 (2006.01)

Patent

CA 2443528

A threaded joint for steel pipe formed on a pin and a box having a contact surface including threaded parts and a non-threaded metal contact part and capable of stably assuring a galling resistance and an airtightness without applying compound grease threreto, wherein a solid lubricating film formed with lubricating powder (e.g., molybdenum disulfide) and organic or inorganic binder is formed on the contact surface of at least one of the pin and the box, the ratio of area occupied by the secondary particles of 15 to 60 µm in equi-area equivalent diameter of the lubricating powder in the cross section of the solid lubricating film in thickness direction is 5 to 90%, and fiber-like filler (e.g., inorganic substance whisker) in addition to the lubricating powder is mixed into the solid lubricating film at the mass ratio of the fiber-like filler to the binder of 0.01 to 0.5, whereby, particulary, the galling resistance at high temperatures can be improved.

L'invention concerne un joint fileté pour tuyau en acier constitué d'une broche et d'une boîte pourvue d'une surface de contact comprenant des parties filetées et une partie de contact métallique non filetée. Au moyen de ce joint, on peut garantir de manière stable une résistance au grippage et une étanchéité à l'air sans appliquer de la graisse compoundée. On forme un film lubrifiant solide avec une poudre lubrifiante (par exemple, du disulfure de molybdène) et un liant organique ou non organique, sur la surface de contact de la broche ou de la boîte. Entre 5 et 90 % se situe le taux de la zone occupée par les particules secondaires de 15 à 60 mu m de diamètre équivalent équi-aire de la poudre lubrifiante dans la section transversale dudit film dans le sens de l'épaisseur. En outre, la charge similaire à de la fibre (par exemple, de la trichite de substance non organique) ajoutée à la poudre lubrifiante est mélangée dans le film lubrifiant solide à un rapport de masse de ladite charge et du liant compris entre 0,01 et 0,5, ce qui permet notamment d'améliorer la résistance au grippage à des températures élevées.

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