The microstructure of 00Cr29Ni6Mo2N super duplex stainless steel solution-treaded at 1080 ℃ for 30 min + aged at 650 ~ 1000 °C for 60 min is investigated by means of scanning electron microscopy (SEM) and energy

dispersive X-ray spectrometer (EDS). The experimental results indicate that Cr

2

N and ct phase precipitate at the ferrite/ austenite interface and an amount of Cr

2

N precipitates within the ferrite grain. The precipitation of the Cr

2

N occurs before the ct phase

the increase in aging temperature and aging time do not obviously affect on the amount of Cr

2

N precipitate

but the fraction of the ct phase increases firstly and then decreases with increasing the aging temperature

as aging at 850°C the σ-phase area percentage content is maximum

up to 5.8%

and at given aging temperature with aging time increasing the σ-phase content increases. Precipitated Cr

2

N and a phase both reduce the pitting potential of 00Ci29Ni6Mo2N super duplex stainless steel.