Patent ID: 7799149

Claim:
An oil country tubular good for expansion in a well having a composition comprising, 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, a quenched and tempered structure comprising a ferrite ratio of at least 80% and a yield strength in the range from 276 MPa to 379 MPa, wherein the oil country tubular good for expansion has a uniform elongation of at least 18%.