STAINLESS STEEL FOR USE IN OIL WELL TUBE.

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Disclosed is a stainless steel for an oil well tube, which comprises the following components (by mass) : C : 0.001 to 0.05%, Si : 0.05 to 1%, Mn : 2% or less, P : 0.03% or less, S : less than 0.002%, Cr : 16 to 18%, Ni : 3.5 to 7%, Mo : more than 2% and not more than 4%, Cu : 1.5 to 4%, a rare earth metal : 0.001 to 0.3%, sol.Al : 0.001 to 0.1%, Ca : 0.0001 to 0.01%, O : 0.05% or less, and N : 0.05% or less, with the remainder being Fe and impurities. The stainless steel contains a REM, and therefore can exhibit excellent SCC resistance even in an aqueous chloride solution having a high temperature.