WELDED HIGH-STRENGTH STEEL STRUCTURE WITH EXCELLENT CORROSION RESISTANCE

摘要

Welded high-strength steel structure with excellent SSC andcorrosion resistance in a wet carbon dioxide environment having a lowH2S concentration. A structure having a Vickers hardness of at most860 and a joint tensile strength of at least 620MPa and composed of abase metal comprising a martensitic stainless steel with a martensiticor tempered martensitic structure containing 0.001 to 0.05%C and 9 to14%Cr and a weld metal comprising an austenitic-ferritic stainless steelhaving a duplex structure composed of austenite and 35 to 75% byvolume of ferrite and containing 22 to 27%Cr,7 to 11%Ni and 1.5 to5%Mo, and at most 0.03%C as an impurity.