Method of manufacturing ERW OCTG that circumferential direction Young's modulus of the steel tube and excellent high crush characteristics

摘要

PURPOSE:To offer a method for manufacturing a resistance welded oil well pipe high in the Young's modulus in the circumferential direction of the steel pipe and excellent in crushing properties. CONSTITUTION:This is a method for manufacturing a resistance welded oil well pipe high in the Young's modulus in the circumferential direction of a steel pipe and excellent in crushing properties having features that, at the time of subjecting a slab to hot rolling, the cumulative draft of the steel in the temp. range of [the Ar3 point +50 deg.C] or below to the Ar1 point to 3 to 10% to the thickness of the initial slab and the sizing reduction of area at the time of manufacturing a resistance welded steel pipe is regulated to 2 to 30%.