Clark & Brody
Oil country tubular good for expansion in well and manufacturing method thereof
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.
Sumitomo Metal Industries, Ltd.
Y C C C C C
Y10S C22C C22C C22C C21D C22C
additional inventional inventional inventional inventional inventional
Hideki Taro Toshiharu Masakatsu Keiichi Tomoki
Takabe Ohe Abe Ueda Nakamura Mori