High strength electric resistance welded steel pipe and manufacturing method thereof

To provide a high strength electric resistance welded steel pipe having excellent bending properties. By mass%, C: 0.04~0.15%, Si: 0.10~0.50%, Mn: 1.0~2.2%, P: 0.050% or less, S: 0.005% or less, Cr: 0.2~1.0%, Ti: 0.005~0.030% , Al: containing 0.010 to 0.050 percent, the composition comprising a balance of Fe and unavoidable impurities, and 70% or more by volume fraction of polygonal ferrite, the retained austenite 3-20% by volume, the remainder being martensite site consists bainite and one or more members selected from among pearlite, polygonal ferrite, the average grain size: electric resistance welded steel pipe having 5μm or more, the tissue is the aspect ratio is 1.40 or less, a.