STEEL PIPE HAVING EXCELLENT FORMABILITY AND METHOD FOR PRODUCTION THEREOF

摘要

A steel pipe having excellent formability, characterized in that it comprises, in mass %, 0.0005 to 0.30 % of C, 0.001 to 2.0 % of Si and 0.01 to 3.0 %of Mn, and optionally contains specific amounts of specific elements, the balance being Fe and inevitable impurities, and, with respect to the plate plane at 1/2 plate thickness position of a steel plate, an average X-ray random intensity ratio of the orientation groups of {110}<110> to {111}<110> is 2.0 or more and/or an X-ray random intensity ratio of {110}<110> is 3.0 or more. The steel pipe has high strength and exhibits excellent formability in the hydroform process and other forming processes.