| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a steel for electronic-beam welding with which a basic material and a heat-affective part, are suitable to construct the foundation part of a steel tower for wind-force electric generator near the sea and a toughness to breakage, in the fused metal zone is suitably balanced; and an electronic-beam welding joint for forming this steel. <P>SOLUTION: The steel for electronic-beam welding, has the prescribed component composition and satisfies 0.49-0.60 electronic-beam welding hardening index CeEB defined with the following formula (1), and CTOD value δ<SB POS="POST">WM</SB>in the fused metal zone, CTOD value δ<SB POS="POST">HAZ</SB>in the heat-affective zone and CTOD value δ<SB POS="POST">BM</SB>in the basic material, after electronic-beam welding, satisfy the following formulas (2) and (3). Wherein, CeFB=C+9/40Mn+1/15Cu+1/15Ni+1/5Cr+1/5Mo+1/5V (1), 0.15≤δ<SB POS="POST">WM</SB>/δ<SB POS="POST">BM</SB>≤1.1 (2) and 0.15≤δ<SB POS="POST">HAZ</SB>/δ<SB POS="POST">BM</SB>≤1.1 (3). <P>COPYRIGHT: (C)2012,JPO&INPIT |
