| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a steel stock for a welded joint excellent in anti-ductile crack development properties which effectively controls ductile crack development from a stress-concentrated region and a defect generated when receiving large deformation, in a welded joint which is used in a steel structure building built in an earthquake zone and a discontinuous permafrost zone. <P>SOLUTION: The steel stock for a welded joint contains, in mass%, 0.03-0.15% of C, 0.01-1% of Si, and 0.5-2% of Mn, with the balance having composition of Fe and unavoidable impurities, and also has a work hardening rate n, which is represented by the following formula (1) σ=K.ε<SP POS="POST">n</SP>, of 0.12 or more in a region with plastic strain of 3-6%, wherein σ is true stress (MPa), ε is true plastic strain (-), K is a constant, and n is a work hardening rate (%). <P>COPYRIGHT: (C)2013,JPO&INPIT |
