WELDED HIGH-STRENGTH STEEL STRUCTURE WITH EXCELLENT CORROSION RESISTANCE

摘要

Welded high-strength steel structure with excellent SSC and corrosion resistance in a wet carbon dioxide environment having a low H2S concentration. A structure having a Vickers hardness of at most 860 and a joint tensile strength of at least 620MPa and composed of a base metal comprising a martensitic stainless steel with a martensitic or tempered martensitic structure containing 0.001 to 0.05%C and 9 to 14%Cr and a weld metal comprising an austenitic-ferritic stainless steel having a duplex structure composed of austenite and 35 to 75% by volume of ferrite and containing 22 to 27%Cr,7 to 11%Ni and 1.5 to 5%Mo, and at most 0.03%C as an impurity.