HIGH-STRENGTH STEEL PLATE FOR PRESSURE VESSEL HAVING EXCELLENT TOUGHNESS AFTER POST WELD HEAT TREATMENT AND MANUFACTURING METHOD THEREOF

摘要

The present invention relates to a steel plate for a pressure vessel 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 plate for a pressure vessel having excellent strength and toughness even after a post weld heat treatment (PWHT) and to a manufacturing method thereof.