Abstract
Adopting Ti-Nb microalloying design technology, this paper studied the austenitic recrystallization law of Marine steel plate, control rolling process, control cooling process and steel normalizing process control systematically. The thickest 60 mm special Marine steel plate developed which has reached the yield strength of 420MPa and charpy impact energy of more than 200J (-20°C), has high strength, impact toughness, lamellar tear resistance and good welding performance, meeting the technical requirements of thick specification high strength and high toughness special Marine steel plate and realizing the application in large ships.
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