HIGH-STRENGTH THICK STEEL PLATE FOR CONSTRUCTION HAVING EXCELLENT CHARACTERISTICS FOR PREVENTING DIFFUSION OF BRITTLE CRACKS, AND PRODUCTION METHOD THEREFOR

摘要

Provided is a high-strength thick steel plate for structural use having a thickness of 50 mm or more and excellent brittle crack arrestability which can be preferably used for ships and a method for manufacturing the steel plate. The thick steel plate having excellent brittle crack arrestability has a specified chemical composition and a metallographic structure mainly including a ferrite phase and including a texture, in which the integration degree I of the RD//(110) plane in the surface portion is 1.3 or more and the integration degree I of the RD//(110) plane in the central portion in the thickness direction is 1.8 or more, a Charpy fracture appearance transition temperature vTrs in the surface portion of -60°C or lower and a Charpy fracture appearance transition temperature vTrs in the central portion in the thickness direction of -50°C or lower.