DETERMINATION METHOD OF BRITTLE CRACK ARREST PROPERTY OF HIGH STRENGTH THICK STEEL PLATE

摘要

PROBLEM TO BE SOLVED: To provide a method of determining a brittle crack arrest property of a high strength thick steel plate by a simple and rational method.SOLUTION: A determination method of a brittle crack arrest property of a high strength thick steel plate is provided that includes: a step of performing a brittle fracture arrest test and a complex miniature test using a plurality of standard steels; a step of calculating a correlation model of a Kca value actually measured by the brittle fracture arrest test and a result (NDT temperature and fracture surface transition temperature or energy transition temperature) of the complex miniature test; a step of deciding an arrest property determination criteria for each plate thickness based on the brittle fracture arrest test, a result of the complex miniature test, and the correlation model; a step of performing the complex miniature test using a sample steel; and a step of determining the arrest property of a sample plate based on the result of the complex miniature test of the sample steel and the determination criteria.