SCC Behavior of TP439 Stainless Steel in High Temperature and High Pressure Water

The microstructure and stress corrosion cracking (SCC) behavior of TP439 ferrite stainless steel in high temperature and high pressure water were studied by scanning electron microscopy, potentiodynamic polarization curve, energy dispersive spectra and slow strain rate test (SSRT). The results showed that the microstructure of TP439 ferrite stainless steel presented ferritic grains and the particles of fine carbide were distributed; the potential of TP439 stainless steel in 3.5% NaCl was -0.25 V (SCE), and the pitting potential was 0.18 V(SCE). The stress vs strain curves of TP439 stainless steel at different temperatures were similar and their fracture morphology was ductile fracture. Temperature had no obvious effect on SCC and the TP439 stainless steel had the low susceptibility to SCC in high temperature and high pressure water.