| 摘要 |
PROBLEM TO BE SOLVED: To provide a deformation Charpy impact test piece and a quality control method of a brittle fracture propagation stopping characteristic of a thick steel plate, capable of evaluating easily the brittle fracture propagation stopping characteristic of the thick steel plate. SOLUTION: When evaluating a brittle fracture propagation stopping performance Kca value of the thick steel plate, a Charpy impact test is performed by using a deformation Charpy impact test piece having the thickness of 10 mm, the width of 15 mm-25 mm and the length of 55 mm, preferably, a chevron notch deformation Charpy impact test piece. When a 70 J energy transition temperature vT<SB>CN70J</SB>(°C) is lower than vT<SB>CN70J</SB>(°C) calculated by the formula (1), it is determined that the brittle fracture propagation stopping performance Kca value determined by a brittle fracture propagation stopping test is not less than 3,900 (N/mm<SP>1.5</SP>) at T<SB>0</SB>°C. COPYRIGHT: (C)2009,JPO&INPIT
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