And a method of manufacturing the electric resistance welded steel pipe rise in the yield ratio in the coating after heating was prevented

摘要

Yield ratio is low, there is provided a method of manufacturing the electric resistance welded steel pipe with excellent anti-aging properties, C: 0.03~0.12%, Si: 0.03~0.5%, Mn: 0.5~2 .0%, P: 0.03% or less, S: 0.003% or less, Al: 0.10% or less, Nb: 0.01% less than 0.003% or more, Ti: 0.005~0.03 %, N: with each containing 0.006% or less, and, satisfied, respectively, 0.21% weld crack susceptibility composition Pcm ≦ and Ti 3.4N,, the steel pieces balance consisting of Fe and unavoidable impurities The an electric resistance welded steel pipe by After hot rolling, to obtain a winding hot-rolled steel sheet at 600 ℃ below, as well as formed into a tubular the hot rolled steel sheet, and electric resistance welding the abutting surface, the electric resistance welded steel pipe and wherein the heating in the range of 400~720 ℃ heating temperature.