Austenitic Stainless Alloy Welded Joint And Austenitic Stainless Alloy Welding Material

Abstract: The present invention provides an austenitic stainless alloy welded joint which comprises a welding metal that has excellent high-temperature welding cracking resistance, polythionic acid SCC resistance, naphthenic acid corrosion resistance and aging toughness. According to the present invention, a welding metal (20) contains, in mass%, 0.020% or less of C, 0.01-1.00% of Si, 0.20-2.00% of Mn, 0.030% or less of P, 0.010% or less of S, 16.0-25.0% of Cr, 15.0-40.0% of Ni, 2.5-5.0% of Mo, 0.10-2.00% of Nb, 0.05-0.30% of N, 0.001-0.100% of sol. Al and 0.0010-0.0050% of B, with F1 defined by formula (1) being 2.30 or less and F2 defined by formula (2) being 2.5 or less. (1): F1 = 130B + 8C + 0.025Cr + 0.25Mn + 0.08Mo + 0.6Nb + 12P + 7.6S + 0.78Si + 0.12W (2): F2 = [Mo]H/[Mo]L

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