AGENT FOR FORMING SOLID LUBRICATING COATING FILM, OIL COUNTRY TUBULAR GOODS, AND THREADED JOINT FOR OIL COUNTRY TUBULAR GOODS
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United States of America Patent
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Issued Date -
Jul 4, 2024
app pub date -
May 24, 2022
filing date -
May 31, 2021
priority date (Note) -
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Abstract
A solid lubricating coating film is used to realize galling resistance equal to or higher than a method using a dope compound regarding lubrication characteristics during make-up/break-out of oil country tubular goods. A threaded joint for oil country tubular goods includes a box having a thread and a pin having a male thread. A lubricating coating film including a solid lubricating coating film forms on a tightening surface of a thread portion of at least one component of the box and pin, the solid lubricating coating film is formed by dispersing a solid lubricant in a binder resin, 90 wt % or more of the binder resin is a polyamideimide resin, an average molecular weight of the polyamideimide resin is 20,000 or more and 40,000 or less, 80 wt % or more of the solid lubricant is polytetrafluoroethylene (PTFE), and an average molecular weight of the PTFE is 30,000 or less.
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