Contents Prefabricated ferrite-austenite duplex stainless steel excellent in crack susceptibility

摘要

The present invention relates to a ferrite-austenite two-phase stainless steel excellent in susceptibility to coagulation cracking during welding, which satisfies the basic properties as a two-phase stainless steel, and more particularly relates to a ferritic stainless steel STS It is an object of the present invention to provide a ferrite-austenite two-phase stainless steel which can be lowered to 430 levels. The ferritic stainless steel according to any one of the preceding claims, wherein the ferritic-austenite two-phase stainless steel contains 0.04% or less of C, 0.7% or less of Si, 1.5% or less of Mn, 22-27% of Cr, 4-12%-3.5%, N: 0.03% or less, P: 0.025% or less, S: 0.01% or less, the balance Fe and other unavoidable impurities; And a ferrite content in the steel is 30-70%. The ferrite-austenite duplex stainless steel is excellent in content susceptibility cracking susceptibility.