15 - 70mass , independently or compounding W and Mo, below 10mass it contains

摘要

PROBLEM TO BE SOLVED: To provide an ultrahigh-purity ferritic iron alloy for welding by which a weld zone having excellent corrosion resistance, strength, toughness, etc., and also having excellent stress corrosion cracking resistance can be obtained and also to provide its welding method and its welded structure.;SOLUTION: The ultrahigh-purity ferritic iron alloy which has a composition containing, by mass, 15 to 70% Cr and ≤100 ppm, in total, of C, N, S and O or further containing, by mass, ≤10% W and/or 0.01 to 0.2% Ti and 0.05 to 0.2% Nb is welded and then heat treated at 900 to 1,300°C to obtain the weld zone free from structure change.;COPYRIGHT: (C)2006,JPO&NCIPI