Seizure resistance to excellent for oil country tubular goods threaded joints

摘要

The prior art has a drawback that it is difficult to provide a threaded joint for an oil country tubular goods having excellent galling resistance at a threaded portion on a pin pipe end side as industrial products. Provided is a threaded joint for an oil country tubular goods having excellent galling resistance, which is a premium joint, a ratio L/p of a chamfer length of pin thread L to a thread pitch p being set to 1.0 or more to 3.0 or less.