Threaded joint for steel pipes

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

Patent

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Details

F16L 15/04 (2006.01) C10M 103/06 (2006.01) C10M 169/02 (2006.01) C25D 5/26 (2006.01) C25D 7/00 (2006.01)

Patent

CA 2621036

A threaded joint for steel pipes comprised of a pin (1) and a box (2) each having a threaded portion (1a, 2a) and an unthreaded metal contact portion (1b, 2b) exhibits adequate leakage resistance and galling resistance when used for makeup of oil country tubular goods with application of a green dope or even without any dope. The threaded joint has a first plating layer of Sn-Bi alloy plating or Sn-Bi-Cu alloy plating formed on the contact surface of at least one of the pin (1) and the box (2). The first plating layer may have a second plating layer selected from Sn plating, Cu plated, and Ni plating on its lower side and at least one layer of a lubricating coating, and particularly a solid lubricating coating, on its upper side.

Cet assemblage vissé pour tuyaux en acier constitué d~une broche 1 et d~un boîtier 2 comportant chacun une portion filetée (1a, 2a) et une portion de contact métallique non filetée (1b, 2b) présente une résistance aux fuites et une résistance aux éraillures adéquates lorsqu~il est utilisé pour la fabrication de produits tubulaires dans le domaine pétrolier avec une application d~un enduit d~enrobage vert, ou sans aucun enduit d~enrobage. L~assemblage vissé comporte une première couche d~un placage en alliage Sn-Bi ou en alliage Sn-Bi-Cu disposée sur la surface de contact d~au moins l~un des éléments que sont la broche 1 et le boîtier 2. La première couche de placage peut comporter une seconde couche de placage sélectionnée parmi un placage au Sn, un placage au Cu, et un placage au Ni sur son côté inférieur et au moins une couche d~un revêtement lubrifiant, et en particulier un revêtement lubrifiant solide, sur son côté supérieur.

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