| 摘要 |
PROBLEM TO BE SOLVED: To provide an austenitic stainless steel welding structure having a weld zone of high quality in which low temperature toughness is improved and pitting corrosion in a seawater corrosion environment is evaded. SOLUTION: The austenitic stainless steel welding structure having excellent low temperature toughness and seawater corrosion resistance is composed of an austenitic stainless steel base metal having a composition containing prescribed amounts of C, Si, Mn, Ni, Cr, Mo, N and Al, and in which O, P and S are limited, and further containing prescribed amounts of one or more selected from Cu, Ti, Nb, V and W, and having a PIW value as an index of corrosion resistance within a range of from 35 to 40 and aδcal value as an index of a ferrite content within a range between -6 and +4, and a weld metal formed at a weld zone and having a composition containing prescribed amounts of C, Si, Mn, Ni, Cr, Mo, Cu, N and Al, and in which O, P and S are limited, and having a ratio of a Cr equivalent to Ni equivalent (Cr equivalent/Ni equivalent) within a range of from 0.85 to 1.2 and a PI value as an index of pitting corrosion resistance of 35 or more. COPYRIGHT: (C)2007,JPO&INPIT |
