A method of manufacturing a high-strength welded structural steel base material toughness and excell

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PROBLEM TO BE SOLVED : To provide high strength steel for welding structures which has excel lent base metal toughness and HAZ(heat affected zone) toughness, and to pro vide a production method therefor. SOLUTION : The high strength steel for welding structures having excellent base metal toughness and HAZ toughness has a composition containing by mass, 0.01 to 0.2% C, 0.02 to 0.5% Si, 0.3 to 2% Mn, =10, 000 pieces per square mm.