Threaded joint for pipes having a lubricating coating

Details Threaded joint for pipes having a lubricating coating Threaded joint for pipes having a lubricating coating

C - Chemistry, Metallurgy

10

M

C10M 169/00 (2006.01) F16L 15/04 (2006.01) C10M 109/00 (2006.01) C10M 117/00 (2006.01) C10M 125/02 (2006.01) C10M 125/10 (2006.01) C10M 125/18 (2006.01) C10M 129/28 (2006.01) C10M 145/40 (2006.01) C10M 159/02 (2006.01) C10M 159/06 (2006.01) C10M 159/20 (2006.01)

Patent

CA 2703778

A lubricating coating which is free from harmful heavy metals is formed on a premium threaded joint for pipes constituted by a pin and a box each having a contact surface comprising a threaded portion and an unthreaded metal contact portion (a sealing surface and shoulder) in order to provide the joint with galling resistance, gas-tightness, and anticorrosive properties such that the unthreaded metal contact portion is prevented from yielding even when the joint is made up with a high torque. The lubricating coating comprises one or both of a rosin and calcium fluoride; metal soap; wax; and a basic metal salt of an aromatic organic acid, and preferably it further includes a lubricating powder, magnesium carbonate, and/or a carbohydrate, particularly a cyclodextrin.

L'invention concerne un film lubrifiant qui présente une excellente résistance au grippage, une bonne étanchéité au gaz et des propriétés de prévention de la rouille, et qui permet d'empêcher la déformation d'une partie non filetée de contact entre les métaux même lorsque l'on serre à un couple élevé, qui ne présente aucun métal lourd nocif tel que le plomb, et qui est formé sur un raccord fileté spécial pour tube qui comprend un goujon et un boîtier dotés chacun d'une surface de contact avec une partie filetée, et une partie non filetée de contact entre les métaux (une face d'étanchéité et une partie d'épaulement). Ce film lubrifiant contient du colophane et/ou du fluorure de calcium, un savon métallique, de la cire et un sel métallique basique d'un acide organique aromatique et contient en outre de préférence une poudre lubrifiante, du carbonate et/ou du carbohydrate de magnésium et en particulier de la cyclodextrine.

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