Stress corrosion cracking (SCC) behavior of two high nitrogen steels, P900 (0.58 wt% N) and P900N (0.90 wt% N), in 1 wt% NaCl solution under an applied potential condition was investigated by slow strain rate testing (SSRT). The experimental results showed that there exists a critical potential for SCC for each of these two materials in the above solution. At applied potentials of 500 and 650 mV(SHE), SCC assisted by pitting corrosion was found to occur in P900 and P900N, respectively. The results also indicated that P900N is more resistant than P900 to SCC in 1 wt% NaCl solution. Electrolyte analyses after SSRT tests showed that during SCC tests most nitrogen from the steels is converted to NH4+.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Materials Science(all)