ELECTROSEAMED STEEL PIPE, AND PRODUCTION METHOD OF ELECTROSEAMED STEEL PIPE

To provide an electroseamed steel pipe having high intensity and excellent low-temperature toughness.SOLUTION: An electroseamed steel pipe is composed of predetermined components and has a component composition of a ratio Mn/Si of Mn content to Si content higher than 36, a fine structure composed of a bainite phase and a ferrite phase of an area ratio of 10% or less, and mechanical characteristics of a tensile strength of 780 MPa or more and a Charpy absorption energy of 31 J or more at -20°C.SELECTED DRAWING: None 【課題】高強度かつ低温靭性に優れた電縫鋼管を提供する。【解決手段】所定の成分からなり、かつＳｉ含有量に対するＭｎ含有量の比Ｍｎ／Ｓｉが３６超である成分組成を有し、ベイナイト相と、面積率１０％以下のフェライト相からなる微細組織を有し、引張強度が７８０ＭＰａ以上、－２０℃におけるシャルピー吸収エネルギーが３１Ｊ以上である機械的特性を有する、電縫鋼管。【選択図】なし