Sumitomo Metal Industries, Inc.

Tomoki Mori

Masakatsu Ueda

Kunio Kondo

Masaaki Igarashi

Kazuhiro Ogawa

Keiichi Nakamura

Hideki Takabe

Taro Ohe

Toshiharu Abe

An oil country tubular good for expansion according to the invention is expanded in a well. The oil country tubular good for expansion has a composition containing, in percentage by mass, 0.05% to 0.08% C, at most 0.50% Si, 0.80% to 1.30% Mn, at most 0.030% P, at most 0.020% S, 0.08% to 0.50% Cr, at most 0.01% N, 0.005% to 0.06% Al, at most 0.05% Ti, at most 0.50% Cu, and at most 0.50% Ni, and the balance consisting of Fe and impurities, and a structure having a ferrite ratio of at least 80%. The oil country tubular good for expansion has a yield strength in the range from 276 MPa to 379 MPa and a uniform elongation of at least 16%. Therefore, the oil country tubular good according to the invention has a high pipe expansion characteristic.

Oil country tubular good for expansion in well and manufacturing method thereof

Duplex stainless steel

Growing community of inventors

Osaka, Japan

Tomoki Mori