Steel Pipe For Oil Well

Abstract: Provided is a steel pipe for an oil well, the pipe comprising a Zn-Ni alloy plating layer having excellent seizure resistance. The steel pipe for an oil well according to the present disclosure comprises: a pipe body including a pin that includes a pin contact surface, and a box that includes a box contact surface; and a Zn-Ni alloy plating layer formed on at least one of the pin contact surface and the box contact surface. The chemical composition of the pipe body contains, in mass%, C: 0.01-0.60%, Cr: 0-8.0%, and Fe: 80.0% or more. Furthermore, when a C-enriched layer is defined as a region containing 1.5 times or more the C content of the pipe body in mass%, the thickness of the C-enriched layer of the pipe body in the wall thickness direction is 0-1.50 µm.

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