Threaded joint for an oil well pipe and method for manufacturing same

摘要

A threaded joint for an oil well pipe in which a conventional threaded joint for an oil well pipe is improved so that sufficient fatigue fracture strength is secured, and a method for manufacturing the same are provided. An axial-direction residual stress of a threaded bottom part is set to −400 MPa or less as a value of X-ray stress analysis between a surface and a part with a depth of 40 μm.