High-strength steel material for pressure container having outstanding toughness after pwht, and production method therefor

The present invention relates to a steel material for a pressure container which can be appropriately used in petrochemical production equipment, storage tanks, heat exchangers, reactors, condensers and the like. More specifically, the invention relates to a steel material for a pressure container having outstanding strength and toughness even after a post-welding heat treatment (PWHT) and a production method therefor.