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 2608043

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.

Joint fileté pour tuyau d'acier formé sur un axe et un bâti, avec une surface de contact comprenant des pièces filetées et une partie de contact métallique non filetée et capable d'assurer une résistance par grippage stable et une étanchéité à l'air sans avoir à y appliquer une graisse composée, où un vernis de glissement formé de poudre lubrifiante (p.ex., sulfure de molybdène) et un liant organique ou inorganique est formé sur la surface de contact d'au moins un des axes et du bâti, le rapport de surface occupée par les particules secondaires de 15 à 60 nm dans un diamètre de surface équivalente à la poudre lubrifiante sur la surface du vernis de glissement sur le plan de l'épaisseur de 5 à 90 % et un mastic fibreux (p. ex., efflorescence de substance inorganique), en plus de la poudre lubrifiante mélangée dans le vernis de glissement à un rapport de masse mastic fibreux/liant de 0,01 à 0,5, permettant ainsi d'améliorer la résistance par grippage à hautes températures.

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