WELDED DUPLEX STAINLESS JOINT

摘要

Provided is a welded duplex stainless joint in which the occurrence of precipitation of a s phase during high heat input welding can be prevented and which exhibits excellent SCC resistance under high-temperature chloride environments. A weld metal for this welded duplex stainless joint contains, in mass%, 0.030% or less of C, 0.20-1.00% of Si, 8.00% or less of Mn, 0.040% or less of P, 0.0100% or less of S, 2.00% or less of Cu, 7.00-12.00% of Ni, 20.0-30.0 of Cr, 1-4% or Mo, 0.100-0.350% of N, 0.040% or less of sol.Al, and 0.035% or less of O, with the remainder being made up by Fe and impurities, wherein the following formulae (1) and (3) are fulfilled. 2.2Cr+7Mo+3Cu > 66 (1) Cr+11Mo+10Ni-12(Cu+30N) < 100 (3) In the formulae (1) and (3), the content (mass%) of an element in the matrix material or the weld metal is assigned to the symbol of the element.