Welding joints for austenitic stainless steel and welding methods for austenitic stainless steel

摘要

PROBLEM TO BE SOLVED: To provide a welded joint of austenitic stainless steel having excellent corrosion resistance even when a welding material is not used. SOLUTION: In mass%, Cr: 18.00% or more, Ni: 16.00% or more, Mo: 4.00% or more, N: 0.100 to 0.250% are contained, and the following formula (1). ) Is a welded joint provided with a base material of austenitic stainless steel having a pore corrosion resistance index RENB of 40.0 or more and a weld metal, and the pore corrosion resistance index RENB of the base metal and the following formula. An austenitic stainless steel welded joint having a ΔPREN (= PRENW-PRENB) of 1.50 or more, which is the difference from the pore corrosion resistance index PRENW of the weld metal calculated in (2), is adopted. PRENB = [Cr] B + 3.3 [Mo] B + 16 [N] B ... (1) PRENW = [Cr] W + 3.3 [Mo] W + 16 [N] W ... (2) [Selection diagram] None