FIELD: manufacturing technology.
SUBSTANCE: invention relates to threaded connections of pipes and pipe products operating in difficult operating conditions, and can be used in the oil and gas industry to transport corrosive media. In the method, the "nipple-coupling" threaded connection, in which the threaded surface of the coupling is made with a thermal diffusion zinc coating comprising a delta phase iron-zinc layer, the delta phase iron-zinc layer is 10÷55 mcm thick, while the concentration gradient of zinc in the thickness of the delta-phase layer is 0.06÷0.08 wt. %/mcm.
EFFECT: improving the wear resistance and performance of the threaded connection by ensuring minimal wear and eliminating the formation of scuffing of the threaded surfaces of the nipple and coupling as a result of repeated screwing and unscrewing.
1 cl, 1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| APPLICATION METHOD OF THERMAL DIFFUSION ZINC COATING, AND COUPLING WITH THERMAL DIFFUSION ZINC COATING | 2012 |
|
RU2507300C2 |
| CONNECTION OF CORROSION-RESISTANT CASING OR LIFTING PIPES AND METHOD OF CONNECTION FABRICATION | 2008 |
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RU2384789C1 |
| MODIFIED ZINC POWDER FOR THERMO-DIFFUSION ZINCING, PROCEDURE FOR APPLICATION OF COATING AND CLUTCH WITH THERMO-DIFFUSION ZINC COATING | 2008 |
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| THERMODIFFUSION ZINC COATING | 2012 |
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| THREADED CONNECTION OF OIL WELL TUBING (VARIANTS) | 2006 |
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| METHODS OF COATING PRODUCTION ON ITEMS OUT OF LOW AND HIGH ALLOYED STEELS, NON-FERROUS METALS OR THEIR ALLOYS BY METHOD OF THERMODIFFUSION GALVANISING | 2014 |
|
RU2570856C1 |
| THREADED JOINT FOR STEEL PIPES | 2006 |
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RU2349825C1 |
| COLLAR WITH CONNECTING LOCKS | 2007 |
|
RU2334156C1 |
| METHOD OF PREPARING POWDERED MIX FOR THERMODIFFUSION ZINC-PLATING | 2000 |
|
RU2180018C1 |
