Austenitic stainless steels with excellent ductility and aging resistance

摘要

Problem to be solved: to provide an austenitic stainless steel in which defects such as aging cracking or delayed rupture are not generated after expansion and curling of five steps or more.An austenitic stainless steel excellent in tube ductility and aging resistance according to one embodiment of the present inventionBy weight%C: 0.01 to 0.04%Si: 0.1 to 1.0%Mn: 0.1 to 2.0%Cr: 16 to 20%Ni: 6 to 10%Copper: 0.1 to 2.0%Mo: 0.2% or lessN: 0.035 to 0.07%C + N: 0.1% or lessContains residual Fe and inevitable impurities.MD30 × Grain size μ The value of M is less than - 500.Diagram