Agent, oil country tubular goods, and threaded joint for oil country tubular goods

Oil country tubular goods with a lubricating coating film including a solid lubricating coating film formed on a thread portion, wherein

• the solid lubricating coating film includes a solid lubricant dispersed in a binder resin,
• a main component of the solid lubricant is melamine cyanurate, and an average particle diameter of the melamine cyanurate is 0.1 μm or more and 10.0 μm or less,
• the binder resin contains an alkyd resin and nitrocellulose, and the alkyd resin and nitrocellulose are contained in an amount of 85 wt % or more of the total binder resin component weight,
• the total weight of the solid lubricant is 10 parts by weight or more and 100 parts by weight or less with respect to 100 parts by weight of the total weight of the binder resin, and
• a thickness of the solid lubricating coating film is 10 μm or more and 150 μm or less.