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|1. (WO2018042522) OIL WELL PIPE FOR EXPANDABLE TUBULAR|
|Applicants:||NIPPON STEEL & SUMITOMO METAL CORPORATION
|Title:||OIL WELL PIPE FOR EXPANDABLE TUBULAR|
This oil well pipe for expandable tubular comprises, in mass%, 0.020-0.080% of C, 0.50% or less of Si,0.30-1.60% of Mn, 0.030% or less of P, 0.010% or less of S, 0.005-0.050% of Ti, and 0.010-0.500% of Al, the remaining portion being Fe and impurities, wherein, in the metal structure, the area fraction of a first phase including ferrite is 90.0-98.0%, and the area fraction of a second phase including one or more selected from the group consisting of annealed martensite, annealed bainite, and pearlite is 2.0-10.0%.