Abstract

The influence of high temperature water and 22% NaCl solution leads to transgranular stress corrosion cracking with propagation rate of 0.5...40× 10^–11 m/s. During dissolution of high nitrogen Cr–Mn steels in electrochemical-active state corrosion rate is i_cor.=0.1...4 mA/cm². The most aggressive environments for high nitrogen Cr–Mn steels is 22% CuCl₂ solution. Even short-term contact at room temperature with this solution leads to intensive pitting formations and long-term contact – to catastrophic intergranular cracking with crack propagation rate of 1.56× 10^–9 m/s. At the following stages it causes the selective dissolution of steels and ulcer corrosion.